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HomeMy WebLinkAboutStormwater Management PlanA STORMWATER MANAGEMENT PLAN (SWMP) PREPARED FOR: PARACHUTE/BATTLEMENT MESA PARKS AND RECREATION DISTRICT -BATTLEMENT PARK PREPARED BY: SGM 118 WEST SIXTH STREET, SUITE 200 GLENWOOD SPRINGS, CO 81601 PHONE: 970-945-1004 FAX: 970-945-5948 July 25, 2013 Prepared by E3SGM 1 1 S WEST SIXTH STREET, SUITE 200 GLENWOOD SPRINGS, CO H 1 6131 970.945.1 004 970.945.5948 FAX 1.0 Introduction This Stormwater Management Plan (S1WP) is required for compliance with the Colorado Discharge Permit System (CDPS) general permit for Stormwater Discharges Associated with Construction Activities (the Stormwater Construction Permit) for the Battlement Park project located in Battlement Mesa, Colorado. This document addresses the construction and post - construction control measures [i.e., Best Management Practices (BMPs)] that are best suited to this site during construction. A copy of this SWMP will be kept on site during construction. The overall goals of this SWMP are to identify possible pollutant sources that may contribute pollutants to stormwater, and identify BMPs that, when implemented, will reduce or eliminate any possible water quality impacts. A copy of the SWMP must be kept on site by the Contractor, readily available to the operator, the Colorado Department of Public Health and Environment (CDPHE) Water Quality Control Division (WQCD) or EPA personnel for review during inspections. Town, county, and local agencies may also request the SWMP as part of a local oversight program. If an office location is not available at the site, the SWMP must be managed so that it is available at the site when construction activities are occurring (e.g., y keeping the SVVMP in a superintendent's vehicle.) 2.0 Project Description Battlement Bark will be located in Battlement Mesa, Colorado. This proposed 6.15 acre park will serve as the first purpose built community park for a nearby development of 5,000 people. The project will be constructed in multiple phases with Phase 1 disturbing approximately 8.4 acres. 3.0 Site Description This section of the SWIVIP provides an overview of the anticipated Phase 1 construction activities for the Battlement Park project. 3.1 Nature of the Construction Activity Phase 1 of the development of the project will require excavation, rough and final grading, site terracing, utility trenching, and an access road (with Class 6 ABC). 3.2 Proposed Sequence for Major Activities The proposed sequence for major activities is as follows: • Secure the site with construction fencing • Install perimeter BMPs (silt fence, erosion logs, vehicle tracking pads, etc.) • Stabilize stockpile/staging/concrete wash areas with BMPs • Conduct overlot grading and terracing • Install utilities • Road grading • Landscaping/temporary seeding Administered by the Colorado Department of Public Health and Environment (CDPHE) Water Quality Control Division (WQC D), 3.3 Project Area/Construction Disturbance The total area of disturbance for Phase 1 is approximately 8.4 acres which will all be disturbed by construction activities. Existing vegetation located along the eastern edge will remain intact. 3.4 Soils The existing soils at the site are classified as hydrologic soil group B (Potts loam and Potts- Ildefonso complex), which are characterized as being made up of alluvium derived from basalt and/or alluvium derived from sandstone and shale with 6 to 25 percent slopes. These soils are well drained. CTL conducted a subsurface investigation to provide recommendations for foundation design and construction of a commercial structure adjacent to the proposed park. CTL Thompson conducted a geotechnical investigation for the Grand River Hospital District Battlement Medical Office Building at Spencer Parkway and Sipprelle Drive adjacent to this project. See Project Manual for a copy of the report. See Appendix A for the Natural Resources Conservation Service (NRCS) Soil Report. 3.5 Vegetation The site has very little vegetation as it was graded for a project that was not constructed. The estimated percent ground cover is 40%. 3.6 Potential Pollution Sources See Section 3.5 for a list of potential pollutant sources. 3.7 Non-stormwater Discharges The only non-stormwater that will be present during construction is the water used for the concrete wash. The Contractor will implement proper concrete wash procedures so as to avoid the release or discharge of this water from the concrete wash. No dewatering during construction is anticipated at this time; however, if dewatering is needed, the Contractor will apply for coverage and comply with the conditions set forth in the CDPHE-WQCD CDPS General Permit for Discharges Associated with Subterranean Dewatering or Well Development (COG07000). 3.8 Receiving Water The Colorado River is the ultimate receiving water for runoff from the project area. Although the Town of Battlement Mesa is not a regulated Municipal Separate Storm Sewer System (MS4), stormwater from portions of this project area will be conveyed into the Town's existing stormwater system, which discharges to the Colorado River via a dry wash. 4.0 Site Map Appendix B includes a copy of the Site Map with the following features identified: a) construction site boundaries; 2 b) all areas of ground surface disturbance; c) areas of cut and fill; d) areas used for storage of building materials, equipment, soil, or waste; e) locations of dedicated asphalt or concrete batch plants; f) locations of all structural BMPs; g) locations of non-structural BMPs as applicable; and h) locations of springs, streams, wetlands and other surface waters. The Site Map will be marked up by the Contractor in the field every time there is a variation from what is included on this Site Map_ The most recent version of the Site Map (with mark- ups) will be kept on-site with the SWMP document at all times. 5.0 Stormwater Management Contr(:. The overall structural, non-structural and materials handling and spill prevention BMPs selected for this project are based upon the potential pollutant sources and site conditions and will be effective if installed and maintained properly. If for some reason the suggested BMPs below turn out to be impractical or ineffective, it will be up to the Contractor to select a more appropriate BMP than the one listed in the SWMP if needed. The Contractor/SWMP Administrator must update this SWMP and Site Map accordingly to maintain compliance with the CDPS Construction General Permit. 6-OSWMP Administrator The SWMP Administrator will be identified by the Contractor prior to construction. The SWAP Administrator should be a person with authority to adequately manage and direct day-to-day stormwater quality management activities at the site_ The SWAP Administrator will be responsible for the implementation, maintenance, revision of and continued compliance with all aspects of the project site's SVVMP. Table 4. SWMP Administrator Contact Information. Name, Tule Address Phone Number 7.0 Identification of Potential Pollutant Sources The potential pollutant sources. including materials and activities, for this project have been evaluated for the potential to contribute pollutants to stormwater discharges. Table 2 provides a summary of the potential pollutant sources for this project. All identified pollutant sources will be mitigated with the specific BMPs listed in Tables 3-5. In general these potential pollutant sources will be mitigated by_ o Controlling the timing (dry vs. wet weather) and frequency of the activity - 3 o Identifying flat areas that will minimize the conveyance of these pollutants downstream (away from the Colorado River); and o Storing chemicals and potential pollutants using primary and secondary containment (fuel tanks, drum storage, etc.) at product storage and loading/unloading facilities to prevent and contain spills and leaks. Tahle 2_ Potential Pollutant Sources Potential Pollutant Source/Activity Potential Pollutant(s) Applicable to Project Disturbed and stored/stockpiled soils (grading, clearing, access roads, staging areas Sediment Yes Vehicle tracking of soils onpavement) Tracked Sediment Yes Contaminated soils Sediment, Chemicals No Loading/unloadingLoading/unloading operations Chemicals Yes Outdoor storage activities (building materials, fertilizers, chemicals Chemicals Yes Vehicle and equipment maintenance and fueling Chemicals, Oil & Grease, Diesel, Gasoline No Dust -generating rocesses Particulates, Sediment Yes Use of fertilizers and pesticides Fertilizers, Pesticides, Herbicides, Yes Use of fuels, solvents, oils, etc. Detergents, Fuels, Solvents, Oil Yes On-site waste management (dumpsters, waste Iles, liquid wastes Construction Waste, Chemicals Yes Concrete washout Concrete, Sediment Yes On-site equipment washin Detergents, Oil Yes On-site asphalt batch plant Asphaltic Cement, Sediment No On-site concrete batch plant Cement, Sediment No Portable toilets Domestic Sewage Yes Trash Trash Yes Other NIA 8.0 Best Management Practices This section outlines the specific stormwater management controls (BMPs) that will be implemented at the site to adequately control each identified pollutant source. The Contractor will need to include the estimated dates for BMP implementation and maintenance per the construction schedule. All BMPs will be installed prior to construction and maintained per the frequency included in Appendix C (BMP Details). 8.1 Structural Practices for Erosion and Sediment Control All structural practices implemented at the site have been selected to minimize erosion and sediment transport and are identified on the Site Map included in Appendix B. Table 3 provides a summary of the structural BMPs (erosion and sediment controls) suggested for this project. 4 8.2 Non -Structural Practices for Erosion and Sediment Control All non-structural practices implemented at the site have been selected to minimize erosion and sediment transport. Table 4 provides a summary of the non-structural BMPs suggested for this project. 8.3 Phased BMP Implementation The identified BMPs for this project shall be implemented throughout all phases of the project until final stabilization (70% vegetative cover) has occurred and are not limited to, clearing and grubbing; road construction; utility and infrastructure installation; vertical construction; final grading; and final stabilization. 8.4 Materials Handling and Spill Prevention All materials handling and spill prevention BMPs have been selected to minimize impacts from procedures or significant materials that could contribute pollutants to runoff. Such procedures or significant materials could include: exposed storage of building materials; paints and solvents; fertilizers or chemicals; waste material, and equipment maintenance or fueling procedures. To the extent practicable, materials will be stored and handled in covered areas to prevent contact with stormwater, and chemicals will be stored using secondary containment devices to prevent leaks and spills. The Contractor will post the spill prevention and response procedures for this project and include, at a minimum the following: o Notification of the SWMP Administrator o Notification of the Town emergency response/Fire Department o Depending on the nature of the spill and the material involved, notification of the Colorado Department of Public Health and Environment (24-hour spill reporting line — 877-518-5608) o Notification of downstream water users and other agencies: o Instructions for clean-up procedures; o Location and identification of spill kit(s); o Provisions for absorbents to be made available for use in fuel areas, and for containers to be available for used absorbents; and o Procedures for properly washing out concrete truck chutes and other equipment in a manner and location so that the materials and wash water cannot discharge from the site, and never into a storm drain system or stream. Table 5 provides a summary of the materials handling and spill prevention BMPs suggested for this project. 7mhla q Gfrvrfurai RMps Structural BMP Approximate Location Installation Applicable to on Project Date Project Silt fence Portions of the project Yes Straw bale dams inlet protection Yes Straw wattlesterosion logs Portions of the perimeter Yes of project, base of soil stockpiles Earthen diversion berms See Site Map Yes Vegetated swales Existing vegetation along Yes the eastern portion of the ro'ect Sediment trap/pond No Pipe slope drains No Geo rids No Inlet protection At all existing and new Yes inlets as constructed Outlet protection At all existing and new Yes inlets as constructed Culverts See Site Map Yes Vehicle tracking pads one at the access from i Yes Sipprelle Drive Rip -rap Permanent inlet/outlet Yes protection Erosion control blanket No Table 4. Non -Structural BMPs. Non -Structural BMP Approximate Installation Applicable to Location on Date Project Project Surface roughening Entire site as Yes applicable to Kase. Soil stockpile height limit (no _ Proposed at Yes greater than 10 feet) northern portion of site. -Trees/shrubs Perimeter vegetative buffer on Yes the eastern portion of project area. Minimize site disturbance Entire site as Yes applicable to phase. Mulch Disturbed area. Yes Seed and mulch stockpiles if As applicable to all Yes unused for more than 30 days stockpiles, Stockpile toe protection As applicable to all Yes (ditches/silt fence/straw and/or stockpiles. erosion logs) Yes Preservation and protection of Eastern portion of vegetation or trees project area. Yes Good housekeeping practices Throughout all including street sweeping at a phases of minimum of daily (more if construction for the needed); routine cleanup of entire site, trash, waste, and debris Heavy equipment and vehicles Throughout all Yes staged on-site, properly phases of maintained and inspected daily construction for the (no vehicle or equipment entire site. maintenance to occur on-site Informal on-site erosion control Periodic Yes training/awareness by the SWMP throughout all Administrator phases of construction. Table S. Materials Handling and Shill Prevention BMPs. Materials Handling and Spill Approximate Installation Applicable to Prevention BMP Location on Date Project Project Portable toilets — anchored, To Be Determined Yes located away from drainages Fuel storage in bulk tank(s) No provided with secondary containment ands ill kit Mobile fueling performed at Staging area Yes least 200 -feet away from drainages and attended full- time Fertilizers, form oil, solvents, Staging area Yes cleaners, detergents stored in 55 -gallon containers or smaller kept inside storage units Dumpsters containing used Staging area Yes chemical containers or liquid wastes kept covered Equipment cleaning, if Concrete wash Yes performed on-site, uses no detergents and flows to on-site retention basin In case of an accidental release Yes of fuel or other chemicals, absorbent booms or earthen berms will be immediately constructed to contain the spill and prevent runoff to adjacent surface waters. The Town's emergency response team/Fire Department will be contacted to assist with the cleanup of the released materials. Material Safety Data Sheets Contractor's trailer Yes (MSDSs) for on-site chemicals will be kept at the construction trailer to facilitate spill response and cleanup. 8.5 Dedicated Concrete or Asphalt Batch Plants There will not be a concrete or asphalt batch plant on site for this project. 8.6 Vehicle Tracking Control One vehicle tracking control pad will be used at the access point off of Sipprelle Drive for this project. Additional non-structural BMPs will be implemented to ensure there is minimal access to the site other than equipment and Contractor trucks and vehicles; street sweeping will occur at a minimum daily and more frequent if needed. 8.7 Waste Management, Concrete Washout A dedicated concrete wash will be installed prior to the placement of any concrete_ A location for the concrete wash has been identified as shown on the Site Map included in Appendix B. 8.8 Groundwater and Stormwater Dewatering No dewatering during construction is anticipated at this time. 9.0 Final Stabilization and Long-term Stormwater Management The proposed final stabilization practices anticipated for Phase 1 will include. o Storm drainage system with riprap protection at the outfall(s); o Temporary seeding/mulch. For those areas to be landscaped the proper soil preparation, amendments and stabilization practices will be implemented in the interim period and until vegetation is planted. Final stabilization is reached when all ground surface disturbing activities at the site have been completed, and uniform vegetative cover has been established with an individual plant density of at least 70 percent of pre -disturbance levels, or equivalent permanent, physical erosion reduction methods have been employed. 10.0 Inspection and Maintenance The Contractor will perform a thorough inspection of the stormwater management system at least every 14 days and within 24 hours of any precipitation or snowmelt event that causes surface erosion (i.e., that results in stormwater running across the ground). If more frequent inspections are required to ensure that BMPs are properly maintained and operated, the inspection schedule must be modified to meet this need. All inspections will be documented. The SWMP Administrator must modify the SWMP to accurately reflect the actual field conditions. Examples include, but are not limited to, removal of BMPs, identification of new potential pollutant sources, addition of BMPs, modification of BMP installation and implementation criteria or maintenance procedures, and changes in items included in the site map and/or description. SWMP revisions must be made prior to changes in site conditions, except for Responsive SWMP Changes, as follows: o SWMP revisions must be made immediately after changes are made in the field to address BMP installation and/or implementation issues; or o SWMP revisions must be made as soon as practicable, but in no case more than 72 hours, after change(s) in BMP installation and/or implementation occur at the site that require development of materials to modify the SWMP (e.g., design of retention pond capacity). 0 10.1 Inspection Procedures The inspection must include observation of: o Construction site perimeter and discharge points (including discharges into a storm sewer system); o All disturbed areas; o Areas used for material/waste storage that are exposed to precipitation; o Other areas determined to have a significant potential for stormwater pollution, such as demolition areas or concrete washout locations, or locations where vehicles enter or leave the site; o Erosion and sediment control measures identified in the SWMP; and o Any other structural BMPs that may require maintenance, such as secondary containment around fuel tanks, or the condition of spill response kits. Once stormwater maintenance issues are identified, the SWMP Administrator will direct the Contractor and appropriate subcontractors to execute the appropriate maintenance and mitigation immediately. 10.2 Inspection Documentation and Recordkeeping The Contractor/Owner must document inspection results and maintain a record of the results for a period of 3 years following expiration or inactivation of permit coverage. These records must be made available to the CDPHE-WQCD or EPA upon request. The following items must be documented as part of the site inspections: o The inspection date; o Name(s) and title(s) of personnel making the inspection; o Location(s) of discharges of sediment or other pollutants from the site; o Location(s) of BMPs that need to be maintained; o Location(s) of BMPs that failed to operate as designed or proved inadequate for a particular location; o Location(s) where additional BMPs are needed that were not in place at the time of inspection; o Deviations from the minimum inspection schedule; o Description of corrective action for items iii, iv, v, and vi, above, dates corrective action(s) taken, and measures taken to prevent future violations, including requisite changes to the SWMP, as necessary; and o After adequate corrective action(s) has been taken, or where a report does not identify any incidents requiring corrective action, the report shall contain a signed statement indicating the site is in compliance with the permit to the best of the signer's knowledge and belief. In addition to the inspection records, the SWMP Administrator may opt to keep a log book for use in tracking other items related to the SWMP such as those listed below. Additional information such as dated photographs, field notebooks, drawings and maps, and the items below, etc. can also be included where appropriate. o BMP operation and maintenance o Stormwater contamination 10 o Contacts with suppliers o Notes on the need for and performance of preventive maintenance and other repairs o Implementation of specific items in the SWMP o Training events (given or attended) o Events involving materials handling and storage o Contacts with regulatory agencies and personnel o Notes of employee activities, contact, notifications, etc. Records of spills, leaks, or overflows that result in the discharge of pollutants must also be documented and maintained. Information that should be recorded for all occurrences includes the time and date, weather conditions, reasons for the spill, etc. Some spills may need to be reported to the CDPHE-WQCD immediately. Specifically, a release of any chemical, oil, petroleum product, sewage, etc., which may enter waters of the State of Colorado (which include surface water, ground water and dry gullies or storm sewers leading to surface water) must be reported. More guidance is available on the CDPHE- WQCUs web at www.cdphe_state_co.us/hm/spillsandreleases.htm. The Division's toll-free 24-hour number for environmental hazards and chemical spills and releases is 1-877-518- 5608. An example inspection form has been provided in Appendix D. This is an example only. The Contractor needs to modify/edit/update this form to capture all the necessary elements of inspections per the CDPHE-WQCD stormwater permit. 11 Appendix A NRCS Soils Report USDA United States Department of Agriculture o MRCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Rifle Area, Colorado, Parts of Garfield and Mesa Counties Battlement Soils co' Gurflold Ii July 15, 2013 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http:/Isoils.usda.gov/sgin and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (http://offices.sc.egov.usda.gov/locator/app? agency=nres) or your NRCS State Soil Scientist (http://soils,usda.gov/contact/ state—offices/). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Surrey is ajoint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Soil Data Mart Web site or the NRCS Web Soil Survey. The Soil Data Mart is the data storage site for the official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 {TDD). USDA is an equal opportunity provider and employer. Contents Preface...... ............ .'... ...... ........ '-.... ~..................... --- .............................. -.2 How SmUSurveys Are MmNe.__.~.................................. .... -..... --- -.'-_-J5 Soil Map ................ ~.~~_____---_~.~~........................ -_.-.~__._—� 6ci|Map- ......... -......................... _---------------_............. ___ JS Legend - 9 -.---.__....~_.---------'--'------~---~— 1� Map Unit Lmgend-... '.~.~~.-.......... ---~.............................. --``~-` Map Unit Descriptions .... ........... ~.... ....... -~------........ -~.~.i� Rifle Area, Coonmdw Parts WfCperfiNeOld and Mesa Counfioa'..................... .i2 56 --Putts Icam, 6 to 12 -- ---._,__-----.12 58--PoCts'Udohonme compWx, 12ho25paicnmtnlo pao............... ......... .-.12 4 How Soil S u rvevs Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape_ Commonly, individual soils on the landscape merge into one another as their characteristics gradually change_ To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil scientists classified and named the soils in the survey area, they compared the Custom Soil Resource Report individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil - landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include Feld measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 7 3726 Sr Custom Soil Resource Report Soil Map 7 120 756100 75r 7:1630 758100 75M7o r',Gs10 ream 78660 75e, 50 n map6ram 13,340dpmllaanAWm(e,5's lT)ehnt Mete N re N 0 �6 Ya leo 270 Feet 0 150 300 600 Sao MAP LEGEND Awa of Interest (AOq Area of Interest (AOI) bons Q Sou Map Units Special Point Futures U Blowout ® Borrow Pt Clay Spot C:Iosed Oepre rsion y, Gravel Pit A Gravelly Spot Q Landfill /L Lava Flow ah, Marsh or swamp R Mine or Ouany Miscellaneous Water p Perennial Water ., Rock Ouluop } Salina Spot .. Sandy Spot �- Severely Froded Spot p Sinkhole li Slide or Slip 0 sodic Spot Spoil Area Q Stony Spot Custflm Sof Resource Report IM Very Stony Spot T Wet spot • other Special Line Features G.ily 1117rt Steep Slope +� Olhar Pal hicaI F-atures O Caiex Water Fe -tures Slreays and Cenah Transportation +++ Rada ry Mtersiate Hiairrrays US Routes Major 140ads N Local Roans MAP INFORMATION Map Scale 13,390 If printed on A size (B 5' a 11') sheer. The soil surveys /hat comprise your ADI were mapped al: 1 24 000. Warning Soil Map may not tie valid at this scale Enlargement of maps beyond the scale of mapping can cause - misunderstanding of the detail of mapping and accuracy of SCE line placement. The maps do not show the small areas of contrasting sails that could have been shown at a more detailed scale, v Please rely on the bar scale on each map sheet for accurate map measurements Source of Map Natural Resources Conservation Service Web Soil Survey UR 1. help11wobsoilsurvey.nrca.usda.gov Coordinate System U TM Ione 12N NAD83 This product is generated from Bre USDA•NRCS cartitred data as of the version dalets) I sled below. Sol Survey Area RISaArea Colorado, Parts of Garfield and Mesa Counties Survey Area Data Version S. Mar 25, 2008 Date(s) aerial images were photographed 8/8/2005 The orthophoIQ or other base map on which the sail fines were compiled and d giticed probooly differs from the background Imagery displayed on these maps. As a resu1L some minor shitting Of map unit boundaries may be evident. Custom Soil Resource Report Map Unit Legend Rifle Area, Colorado, Parts of Garfield and Mesa Counties (C0683) Map Unit Symbol Map Unit Name Acres In AOI Percent of AOI 56 Potts loam, 6 to 12 percent slopes 25.9 68.6% 58 Potts-lidefonso complex, 12 to 25 percent 11.9 31.4% slopes Totals for Area of Interest 37.8 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. 10 Custom Soil Resource Report An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example, An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha - Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 11 Custom Soil Resource Report Rifle Area, Colorado, Parts of Garfield and Mesa Counties 56—Potts loam, 6 to 12 percent slopes Map Unit Setting Elevation: 5,000 to 7,000 feet Map Unit Composition Potts and similar soils: 85 percent Description of Potts Setting Landform: Valley sides, benches, mesas Down-slope shape: Convex, linear Across -slope shape: Convex, linear Parent material. Alluvium derived from basalt and/or alluvium derived from sandstone and shale Properties and qualities Slope: 6 to 12 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Capacity of the most limiting layer to transmit water (Ksat): Moderately high (0.20 to 0.60 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content. 15 percent Maximum salinity: Nonsaline (0.0 to 2.0 mmhos/cm) Available water capacity. High (about 10.3 inches) Interpretive groups Farmland classification: Farmland of statewide importance Land capability classification (irrigated): 4e Land capability (nonirrigated): 4e Hydrologic Soil Group: B Ecological site: Rolling Loam (R048AY298CO) Typical profile 0 to 4 inches: Loam 4 to 28 inches: Clay loam 28 to 60 inches: Loam 58--Potts-Ildefonso complex, 12 to 25 percent slopes Map Unit Setting Elevation: 5,000 to 6,500 feet Map Unit Composition Potts and similar soils: 60 percent 12 Custom Soil Resource Report lldefonso and similar soils: 30 percent Description of Potts Setting Landform: Valley sides, alluvial fans, mesas Down-slope shape: Convex. linear Across -slope shape: Convex, linear Parent material: Alluvium derived from basalt and/or alluvium derived from sandstone and shale Properties and qualities Slope: 12 to 25 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Capacity of the most limiting layer to transmit water (Ksat): Moderately high (0.20 to 0.60 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 15 percent Maximum salinity: Nonsaline (0.0 to 2.0 mmhos/cm) Available water capacity. High (about 10.3 inches) Interpretive groups Farmland classification: Not prime farmland Land capability (nonirrigated): fie Hydrologic Soil Group: B Ecological site: Rolling Loam (R048AY298CO) Typical profile 0 to 4 inches: Loam 4 to 28 inches: Clay loam 28 to 60 inches: Loam Description of lldefonso Setting Landform: Alluvial fans, mesas, valley sides Down-slope shape: Convex Across -slope shape: Convex Parent material: Alluvium derived from basalt and/or alluvium derived from sandstone and shale Properties and qualities Slope: 12 to 25 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.60 to 6.00 in/hr) Depth to watertable: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 35 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 4.0 mmhos/cm) Available water capacity: Low (about 5.1 inches) 13 Custom Soil Resource Report Interpretive groups Farmland classification: Not prime farmland Land capability (nonirrigated): 6e Hydrologic Soil Group: B Typical profile 0 to 8 inches: Stony loath 8 to 60 inches: Very stony loam 14 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31, Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. httpJ/soils.usda.gov/ Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http://soils.usda.gov/ Soil Survey Staff. 2006. Keys to soil taxonomy. 10th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http,//soils.usda.gov/ Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual, Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://soils.usda.gov/ United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.glti.nres.usda.gov/ United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430 -VI. http_/Isoils.usda.gov/ United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean; and the Pacific Basin, U.S. Department of Agriculture Handbook 296. http:ltsoils.usda.gov/ 15 Custom Soil Resource Report United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. 1B Appendix B Site Map/Cut and Fill Map Appendix C BMP Details Vehicle Tracking Control (VTC) S--4 Description Vehicle tracking controls provide stabilized construction site access where vehicles exit the site onto paved public roads. An effective vehicle tracking control helps remove sediment (mud or dirt) from vehicles, reducing tracking onto the paved surface. Appropriate Uses Implement a stabilized construction entrance or vehicle tracking control where frequent heavy vehicle traffic exits the construction site onto a paved roadway. An effective vehicle tracking control is particularly important during the following conditions.- ft onditions: Photograph VTC -1. A vehicle tracking control pad constructed with properly sized rock reduces off-site sediment tracking. ■ Wet weather periods when mud is easily tracked off site. ■ During dry weather periods where dust is a concern. ■ When poorly drained, clayey soils are present on site. Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at particularly muddy sites. Design and Installation Construct the vehicle tracking control on a level surface. Where feasible, grade the tracking control towards the construction site to reduce off-site runoff. Place signage, as needed, to direct construction vehicles to the designated exit through the vehicle tracking control. There are several different types of stabilized construction entrances including: VTC -I. Aggregate Vehicle Tracking Control. This is a coarse -aggregate surfaced pad underlain by a geotextile. This is the most common vehicle tracking control, and when properly maintained can be effective at removing sediment from vehicle tires. VTC -2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of control may be appropriate for site access at very small construction sites with low traffic volume over vegetated areas. Although this application does not typically remove sediment from vehicles, it helps protect existing vegetation and provides a stabilized entrance. Vehicle Tracking Control Functions Erosion Control Moderate Sediment Control Yes Site/Material Management Yes November 2010 Urban Drainage and Flood Control District VTC -1 Urban Storm Drainage Criteria Manual Volume 3 SM -4 Vehicle Tracking Control {VTC) VTC -3. Stabilized Construction Entrance/Exit with Wheel Wash. This is an aggregate pad, similar to VTC -1, but includes equipment for tire washing. The wheel wash equipment may be as simple as hand-held power washing equipment to more advance proprietary systems. When a wheel wash is provided, it is important to direct wash water to a sediment trap prior to discharge from the site. Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff. Maintenance and Removal Inspect the area for degradation and replace aggregate or material used for a stabilized entrance/exit as needed. If the area becomes clogged and ponds water, remove and dispose of excess sediment or replace material with a fresh layer of aggregate as necessary. With aggregate vehicle tracking controls, ensure rock and debris from this area do not enter the public right-of-way. Remove sediment that is tracked onto the public right of way daily or more frequently as needed. Excess sediment in the roadway indicates that the stabilized construction entrance needs maintenance. Ensure that drainage ditches at the entrance/exit area remain clear. Photograph VTC -2. A vehicle tracking control pad with wheel wash facility, Photo courtesy of Tom Gore. A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to occur. This is typically after the site has been stabilized. When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to discharge. Also inspect channels conveying the water from the wash area to the sediment trap and stabilize areas that may be eroding. When a construction entrance:"exit is removed, excess sediment from the aggregate should be removed and disposed of appropriately. The entrance should be promptly stabilized with a permanent surface following removal, typically by paving. VTC -2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Vehicle Tracking Control {VTC) SM -4 SIDEWALK OR OTHER INSEALL ROCK FLUSH WITH OR BELOW 1 50 FOOT VTC 20 FOOT (WIDTH CAN BE LESS IF CONST VEHICLES ARE PHYSICALLY CONFINED ON BOTH SIDES) 9" (MIN ) UNLESS OTHERWISE SPECIFIED BY LOCAL JURISDICTION, USE COOT SECT_ #703. AASHTO #3 COARSE AGGREGATE OR b' MINUS ROCK NON WOVEN GEOTEXTILE FABRIC BETWEEN SOIL AND ROCK UNLESS OTHERWISE SPECIFIED BY LOCAL JURISD;CTION, USE COOT SECT. #70. AAS4T0 F 9" (MIN.) COMPACTED SL,BGRADE —/ SECTION A I NON—WOVEN GEOTEXTILE FABRIC VTC -1. AGGREGATE VEHICLE TRACKING CONTROL November 2010 Urban Drainage and Flood Control District VTC -3 Urban Storm Drainage Criteria Manual Volume 3 SM -4 Vehicle Tracking Control { PUBLIC ROADWI NOTE: WASH WATER MAY NOT CONTAIN CHEMICALS OR SOAPS WITHOUT OBTAIN NG A SEPARATE PERMIT TC ww DITCH CARRY W WASH WATER TO 5'7" MIN. REINFORCED CONCRETE RACKr '� ' ` R r� r i c, ri-T', ra rr . (MAY SUBSTITUTE STEEL CATTLE DRAIN SPACE GUARD FOR CONCRETE RACK) SECTION A VTC -2. AGGREGATE VEHICLE TRACKING CONTROL WITH WASH RACK VTC -4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Vehicle Tracking Control EXISTING PAVED ROADWAY n a 0 0 w a a c� z F w 6 Lox MAx, C) SM -4 VTC/ VTC CM TR DISTURBED AREA, CONSTRUCTION SITE, STABILIZED STORAGE AREA OR STAGING AREA CONSTRUCTION MATS, WOVEN OR TRM 18" MIN p� SPIKES OR `JPO."p STAKES 1 TRM END OVERLAP WITH O���' �° SPIKES OR STAKES QUOS �`G�ta� CONSTRUCTION MATS, WOVEN Q GOA t4 a� OR TURF REINFORCEMENT STRAP MAT (TRM) CONNECTORS RESTRICT CONST. VEHICLE ACCESS TO SIDES OF MAT CONSTRUCTION MAT END OVERLAP INTERLOCK WITH STRAP CONNECTORS 20* OR AS REOU.RED TO ACCOMMODATE ANTICIPATED TRAFFIC (WIDTH CAN BE LESS IF If CONST, VEHICLES ARE PHYSICALLY CONFINED ON BOTH SIDES) VTC -3. VEHICLE TRACKING CONTROL W CONSTRUCTION MAT OR TURF REINFORCEMENT MAT TRM November 2010 Urban Drainage and flood Control District VTC -5 Urban Storm Drainage Criteria Manual Volume 3 SM -4 Vehicle Tracking Control (VTC TABILIZED CONSTRUCTION ENTRANCE/EXIT INSTALLATION 1. SEE PLAN VIEW FOR —LOCATION OF CONSTRUCTION ENTRANCE(S)/EXIT(S). —TYPE OF CONSTRUCTION ENTRANCES)/EXITS(S) (WITH/WITHOUT WHEEL WASH, CONSTRUCTION MAT OR TRM). 2, CONSTRUCTION MAT OR TRM STABILIZED CONSTRUCTION ENTRANCES ARE ONLY TO BE USED ON SHORT DURATION PROJECTS (TYPICALLY RANGING FROM A WEEK TO A MONTH) WHERE THERE WILL BE LIMITED VEHICULAR ACCESS. 3. A STABIUZED CONSTRUCTION ENTRANCE/EXIT SHALL BE LOCATED AT ALL ACCESS POINTS WHERE VEHICLES ACCESS THE CONSTRUCTION SITE FROM PAVED RIGHT—OF—WAYS_ 4. STABILIZED CONSTRUCTION ENTRANCE/EXIT SHALL BE INSTALLED PRIOR TO ANY LAND DISTURBING ACTIVITIES. 5 A NON—WOVEN GEOTEXTILE FABRIC SHALL BE PLACED UNDER THE STABILIZED CONSTRUCTION ENTRANCE/EXIT PRIOR TO THE PLACEMENT OF ROCK. 6. UNLESS OTHERWISE SPECIFIED BY LOCAL JURISDICTION, ROCK SHALL CONSIST OF OOT SECT. 0703, AASHTO #3 COARSE AGGREGATE OR 6" (MINUS) ROCK. STABIL 17ED CONSTRUCTION ENTRANCE/EXIT MAINTENANCE NOTES 1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION. MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE EROSION. AND PERFORM NECESSARY MAINTENANCE. 2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN EFFECTIVE OPERATING CONDITION. INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY. 3. WHERE BMPs HAVE FAILED. REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON DISCOVERY OF THE FAILURE 4. ROCK SHALL BE REAPPLIED OR REGRADED AS NECESSARY TO THE STABILIZED ENTRANCE/EXIT TO MAINTAIN A CONSISTENT DEPTH. 5 SEDIMENT TRACKED ONTO PAVED ROADS IS TO BE REMOVED THROUGHOUT THE DAY AND AT THE END OF THE DAY BY SHOVELING OR SWEEPING SEDIMENT MAY NOT BE WASHED DOWN STORM SEWER DETAINS. NOTE, MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS. CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN DIFFERENCES ARE NOTED (DETAILS ADAPTED FROM Ore OF BROOMFIELD. COLORADO. NOT AVAILABLE IN ALITOCAD) VTC -6 Urban Drainage and blood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Construction Fence (CF) SM -3 Description A construction fence restricts site access to designated entrances and exits, delineates construction site boundaries, and keeps construction out of sensitive areas such as natural areas to be preserved as open space, wetlands and riparian areas. Appropriate Uses A construction fence can be used to delineate the site perimeter and locations within the site where access is restricted to protect natural resources such as wetlands, waterbodies, trees, and other natural areas of the site that should not be disturbed. Motograph Cr -1. A construction fence helps delineate areas where existing vegetation is being protected. Photo courtesy of Douglas County. If natural resource protection is an objective, then the construction fencing should be used in combination with other perimeter control BMPs such as silt fence, sediment control logs or similar measures. Design and Installation Construction fencing may be chain link or plastic mesh and should be installed following manufacturer's recommendations. See Detail CF -1 for typical installations. Do not place construction fencing in areas within work limits of machinery. Maintenance and Removal ■ Inspect fences for damage; repair or replace as necessary. ■ Fencing should be tight and any areas with slumping or fallen posts should be reinstalled. ■ Fencing should be removed once construction is complete. Construction Fence Functions Erosion Control No Sediment Control No Site/Material Mana ement Yes November 2010 Urban Drainage and FIood Control District CF -1 Urban Storm Drainage Criteria Manual Volume 3 SM -3 Construction Fence PLASTIC CAP, TYP. ORANGE RESINET CONSTRUCTION FENCE OR APPROVED EQUAL CF -1. PLASTIC MESH CONSTRUCTION FENCE CONSTRUCTION FENCE INSTALLATION NOTES a 1. SEE PLAN VIEW FOR: -LOCATION OF CONSTRUCTION FENCE. 2. CONSTRUCTION FENCE SHOWN SHALL BE INSTALLED PRIOR TO ANY LAND DISTURBING ACTIVITIES. 3. CONSTRUCTION FENCE SHALL BE COMPOSED OF ORANGE. CONTRACTOR -GRADE MATERIAL THAT IS AT LEAST 4' HIGH. METAL POSTS SHOULD HAVE A PLASTIC CAP FOR SAFETY. 4. STUDDED STEEL TEE POSTS SHALL BE UTILIZED TO SUPPORT THE CONSTRUCTION FENCE MAXIMUM SPACING FOR STEEL TEE POSTS SHALL BE 10'. 5. CONSTRUCTION FENCE SHALL BE SECURELY FASTENED TO THE TOP. MIDDLE, AND BOTTOM OF EACH POST. CF -2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Construction Fence (CF) SII -3 F 1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION. MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE EROSION, AND PERFORM NECESSARY MAINTENANCE 2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN EFFECTIVE OPERATING COND TION INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY, 3. WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON DISCOVERY OF THE FAILURE. 4. CONSTRUCTION FENCE SHALL BE REPAIRED OR REPLACED WHEN THERE ARE SIGNS OF DAMAGE SUCH AS RIPS OR SAGS. CONSTRUCTION FENCE IS TO REMAIN IN PLACE UNTIL THE UPSTREAM DISTURBED AREA 1S STABILIZED AND APPROVED BY THE LOCAL JURISDICTION 5 WHEN CONSTRUCTION FENCES ARE REMOVED, ALL DISTURBED AREAS ASSOCIATED WITH THE INSTALLATION, MAINTENANCE, AND/OR REMOVAL OF THE ' ENCE SHALL BE COVERED WITH TOPSO L. SEEDED AND MULCHED. OR OTHERWISE STABI-IZED AS APPROVED BY LOCAL JURISDICTION. NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS. CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN DIFFERENCES ARE NOTED. (DETAIL ADAPTED FROM 1OWN OF PARKER, COLORADO. NDr AVAILABLE IN AurocAD) November 2010 Urban Drainage and Flood Control District CF -3 Urban Storm Drainage Criteria Manual Volume 3 Protection of Existing V Description Protection of existing vegetation on a construction site can be accomplished through installation of a construction fence around the area requiring protection. In cases where upgradient areas are disturbed, it may also be necessary to install perimeter controls to minimize sediment loading to sensitive areas such as wetlands. Existing vegetation may be designated for protection to maintain a stable surface cover as part of construction phasing, or vegetation may be protected in areas designated to remain in natural condition under post -development conditions (e.g., wetlands, mature trees, riparian areas, open space). Appropriate Uses tion SM -2 Photograph PV -l. Protection of existing vegetation and a sensitive area. Photo courtesy of CDOT. Existing vegetation should be preserved for the maximum practical duration on a construction site through the use of effective construction phasing. Preserving vegetation helps to minimize erosion and can reduce revegetation costs following construction. Protection of wetland areas is required under the Clean Water Act, unless a permit has been obtained from the U.S. Army Corps of Engineers (USACE) allowing impacts in limited areas. If trees are to be protected as part of post -development landscaping, care must be taken to avoid several types of damage, some of which may not be apparent at the time of injury. Potential sources of injury include soil compaction during grading or due to construction traffic, direct equipment -related injury such as bark removal, branch breakage, surface grading and trenching, and soil cut and fill. In order to minimize injuries that may lead to immediate or later death of the tree, tree protection zones should be developed during site design, implemented at the beginning of a construction project, as well as continued during active construction. Design and Installation General Once an area has been designated as a preservation area, there should be no construction activity allowed within a set distance of the area. Clearly mark the area with construction fencing. Do not allow stockpiles, equipment, trailers or parking within the protected area. Guidelines to protect various types of existing vegetation follow. Protection of Existing Vegetation Functions Erosion Control Yes Sediment Control Moderate Site/Material Management Yes November 2010 Urban Drainage and Flood Control District PV -I Urban Storm Drainage Criteria Manual Volume 3 SM --2 Protection of Existing Vegetation (PV) Surface Cover During Phased Construction Install construction fencing or other perimeter controls around areas to be protected from clearing and grading as part of construction phasing. Maintaining surface cover on steep slopes for the maximum practical duration during construction is recommended. Open Space Preservation Where natural open space areas wi I I be preserved as part of a development, it is important to install construction fencing around these areas to protect them from compaction. This is particularly important when areas with soils with high infiltration rates are preserved as part of LID designs. Preserved open space areas should not be used for staging and equipment storage. Wetlands and Riparian Areas Install a construction fence around the perimeter of the wetland or riparian (streamside vegetation) area to prevent access by equipment. In areas downgradient of disturbed areas, install a perimeter control such as silt fence, sediment control logs, or similar measure to minimize sediment loading to the wetland. Tree Protection t Before beginning construction operations, establish a tree protection zone around trees to be preserved by installing construction fences. Allow enough space from the trunk to protect the root zone from soil compaction and mechanical damage, and the branches from mechanical damage (see Table PV -l). if low branches will be kept, place the fence outside of the drip line. Where this is not possible, place fencing as far away from the trunk as possible. In order to maintain a healthy tree, be aware that about 60 percent of the tree's root zone extends beyond the drip line. Table PV -1 Guidelines for Determining the Tree Protection Zone (Source: Matheny and Clark, I998; as cited in GreenCO and W WE 2008) Most tree roots grow within the top 12 to 18 inches of soil. Grade changes within the tree protection zone should be avoided where possible because seemingly minor grade changes can either smother Tree Protection guidelines adapted from GreenCO and W WL (2008). Green lndusiry Best Management Practices (BAl ft for rhe Conservation and Protection of Tater Resources in Colorado: Aloving Toward Sustainability, Third Release. See un"v,ereencn.org for more detailed guidance on tree preservation. PV -2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Distance from Trunk (ft) per inch of DBI1 Species Tolerance to Damage ),Dung Mature Over mature Good 0.5' 0.75' 1.0' Moderate 0.75' 1.0' 1.25' Poor 1.0, 1.25' I.5' Notes: DBH life expectancy; life expectancy diameter at breast height (4.5 ft above grade); Young Mature • 20%-80% of life expectancy; Over mature <20% of >80% of Most tree roots grow within the top 12 to 18 inches of soil. Grade changes within the tree protection zone should be avoided where possible because seemingly minor grade changes can either smother Tree Protection guidelines adapted from GreenCO and W WL (2008). Green lndusiry Best Management Practices (BAl ft for rhe Conservation and Protection of Tater Resources in Colorado: Aloving Toward Sustainability, Third Release. See un"v,ereencn.org for more detailed guidance on tree preservation. PV -2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Protection of Existing Vegetation (PV) SM -2 roots (in fill situations) or damage roots (in cut situations). Consider small walls where needed to avoid grade changes in the tree protection zone. ■ Place and maintain a layer of mulch 4 to 6 -inch thick from the tree trunk to the fencing, keeping a 6 -inch space between the mulch and the trunk. Mulch helps to preserve moisture and decrease soil compaction if construction traffic is unavoidable. When planting operations are completed, the mulch may be reused throughout planting areas. ■ Limit access, if needed at all, and appoint one route as the main entrance and exit to the tree protection zone. Within the tree protection zone, do not allow any equipment to be stored, chemicals to be dumped, or construction activities to take place except fine grading, irrigation system installation, and planting operations. These activities should be conducted in consultation with a landscaping professional, following Green Industry BMPs. ■ Be aware that soil compaction can cause extreme damage to tree health that may appear gradually over a period of years. Soil compaction is easier to prevent than repair. Maintenance and Removal Repair or replace damaged or displaced fencing or other protective barriers around the vegetated area. If damage occurs to a tree, consult an arborist for guidance on how to care for the tree. If a tree in a designated preservation area is damaged beyond repair, remove and replace with a 2 -inch diameter tree of the same or similar species. Construction equipment must not enter a wetland area, except as permitted by the U.S. Army Corps of Engineers (USACE). Inadvertent placement of fill in a wetland is a 404 permit violation and will require notification of the USAGE. If damage to vegetation occurs in a protected area, reseed the area with the same or similar species, following the recommendations in the USDCM Revegelation chapter. November 2010 Urban Drainage and Flood Control District PV -3 Urban Storm Drainage Criteria Manual Volume 3 Construction Phasing/Sequencing (CP) SM -1 Description Effective construction site management to minimize erosion and sediment transport includes attention to construction phasing, scheduling, and sequencing of land disturbing activities. On most construction projects, erosion and sediment controls will need to be adjusted as the project progresses and should be documented in the SWMP. Construction phasing refers to disturbing only part of site at a time io limit the potential for erosion from dormant parts of a site. Grading activities and construction are completed and soils are effectively stabilized on one part of a site before grading and construction begins on another portion of the site. Photograph CP -l. Conbtruction phasing to avoid disturbing (fie entire area of one time. Photo courtesy of WWE. Construction sequencing or scheduling refers to a specified work schedule that coordinates the timing of land disturbing activities and the installation of erosion and sediment control practices. Appropriate Uses All construction projects can benefit from upfront planning to phase and sequence construction activities to minimize the extent and duration of disturbance. Larger projects and linear construction projects may benefit most from construction sequencing or phasing, but even small projects can benefit from construction sequencing that minimizes the duration of disturbance. Typically, erosion and sediment controls needed at a site will change as a site progresses through the major phases of construction. Erosion and sediment control practices corresponding to each phase of construction must be documented in the SWMP. Design and Installation BMPs appropriate to the major phases of development should be identified on construction drawings. In some cases, it will be necessary to provide several drawings showing construction -phase BMPs placed according to stages of development (e.g., clearing and grading, utility installation, active construction, final stabilization). Some municipalities in the Denver area set maximum sizes for disturbed area associated with phases ofa construction project. Additionally, requirements for phased construction drawings vary among local governments within the UDFCD boundary. Some local governments require separate erosion and sediment control drawings for initial Construction Scheduling BMPs, interim conditions (in active construction), and final stabilization. Functions Erosion Control Moderate Sediment Control Moderate Site/Material Management Yes November 2010 Urban Drainage and Flood Control District CP -I Urban Storm Drainage Criteria Manual Volume 3 SM -1 Construction Phasing/Sequencing (CP Typical construction phasing BMPs include: ■ Limit the amount of disturbed area at any given time on a site to the extent practical. For example, a 100 -acre subdivision might be constructed in five phases of 20 acres each. ■ If there is carryover of stockpiled material from one phase to the next, position carryover material in a location easily accessible for the pending phase that will not require disturbance of stabilized areas to access the stockpile. Particularly with regard to efforts to balance cut and fill at a site, careful planning for location of stockpiles is important. Typical construction sequencing BMPs include: ■ Sequence construction activities to minimize duration of soil disturbance and exposure. For example, when multiple utilities will occupy the same trench, schedule installation so that the trench does not have to be closed and opened multiple times. • Schedule site stabilization activities (e.g., landscaping, seeding and mulching, installation of erosion control blankets) as soon as feasible following grading. ■ Install initial erosion and sediment control practices before construction begins. Promptly install additional BMPs for inlet protection, stabilization, etc., as construction activities are completed. Table CP -I provides typical sequencing of construction activities and associated BMPs. Maintenance and Removal When the construction schedule is altered, erosion and sediment control measures in the SWMP and construction drawings should be appropriately adjusted to reflect actual "on the ground" conditions at the construction site. Be aware that changes in construction schedules can have significant implications for site stabilization, particularly with regard to establishment of vegetative cover. CP -2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Construction Phasing/Sequencing (CP) SM -1 Project Phase Table CP -1. Typical Phased BMP Installation for Construction Projects BMPs ■ Install sediment controls downgradient of access point (on paved streets this may consist of inlet protection). ■ Establish vehicle tracking control at entrances to paved streets. Fence as needed. Pre - disturbance, 0 Use construction fencing to define the boundaries of the project and limit access to areas of Site Access the site that are not to be disturbed. Note: it may be necessary to protect inlets in the general vicinity of the site, even if not downgradient, it there is a possibility that sediment tracked from the site could contribute to the inlets. ■ Install perimeter controls as needed on downgradient perimeter of site (silt fence, wattles, etc). ■ Limit disturbance to those areas planned for disturbance and protect undisturbed areas within the site (construction fence, flagging, etc). ■ Preserve vegetative buffer at site perimeter. ■ Create stabilized staging area. ■ Locale portable toilets on flat surfaces away from drainage paths. Stake in areas susceptible to high winds. ■ Construct concrete washout area and provide signage. ■ Sine Clearing Establish waste disposal areas. and Grabbing Install sediment basins. ■ Create dirt perimeter berms and/or brush barriers during grubbing and clearing. ■ Separate and stockpile topsoil, leave roughened and/or cover. ■ Protect stockpiles with perimeter control BMPs. Stockpiles should be located away from drainage paths and should be accessed from the upgradient side so that perimeter controls can remain in place on the downgradient side. Use erosion control blankets, temporary seeding, and/or mulch for stockpiles that will be inactive for an extended period. ■ Leave disturbed area of site in a roughened condition to limit erosion. Consider temporary revegetation for areas of the site that have been disturbed but that will be inactive for an extended period. ■ Water to minimize dust but not to the point that watering creates runoff. November 2010 Urban Drainage and Flood Control District CP -3 Urban Storm Drainage Criteria Manual Volume 3 SM -1 Construction Phasing/Sequencing (CP) Project BMPs Phase In Addition to the Above BMPs: ■ Close trench as soon as possible (generally at the end of the day). Utility And - Use rough -cut street control or apply road base for streets that will not be promptly paved. Infrastructure Installation ' Provide inlet protection as streets are paved and inlets are constructed. ■ Protect and repair BMPs, as necessary. • Perform street sweeping as needed. In Addition to the Above BMPs: ■ Implement materials management and good housekeeping practices for home building activities. Building Construction - Use perimeter controls for temporary stockpiles from foundation excavations. ■ For lots adjacent to streets, lot -line perimeter controls may be necessary at the back of curb. In Addition to the Above BMPs: Final Grading ' Remove excess or waste materials. ■ Remove stored materials. In Addition to the Above BMPs: ■ Seed and mulch/tackify. Final Stabilization - Seed and install blankets on steep slopes. • Remove all temporary BMPs when site has reached final stabilization. CP -4 Urban Drainage and Fiood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Vegetated Buffers (VB) SC -9 Description Buffer scrips of preserved natural vegetation or grass help protect waterways and wetlands from land disturbing activities. Vegetated buffers, improve stormwater runoff quality by -� - . straining sediment, promoting °'" ` ,rte ,;wrr� y �' s, infiltration, and slowing runoff velocities. Appropriate Uses - Vegetated buffers can be used to Photograph V11-1. A vegetated buffer is maintained between the separate land disturbing activities and area of active construction and the drainage .swale. Photo courtesy natural surface waters or conveyances_ ofwwE., In many jurisdictions, local governments require some type of setback from natural waterways. Concentrated flow should not be directed through a buffer; instead, runoff should be in the form of sheet flow. Vegetated buffers are typical ly used in combination with other perimeter control BM Ps such as sediment control logs or silt fence for multi- layered protection. Design and Installation Minimum buffer widths may vary based on local regulations. Clearly delineate the boundary of the natural buffer area using construction fencing, silt fence, or a comparable technique. In areas that have been cleared acid graded, vegetated buffers such as sod can also be installed to create or restore a vegetated buffer around the perimeter of the site. Maintenance and Removal Inspect buffer areas for signs of erosion such as gullies or rills. Stabilize eroding areas, as needed. If erosion is due to concentrated flow conditions, it may be necessary to install a level spreader or other technique to restore sheet flow conditions. Inspect perimeter controls delineating the vegetative buffer and repair or replace as needed. Vegetated Buffers Functions Erosion Control Moderate Sediment Control Yes Site/Material Mann ement Yes November 2010 Urban Drainage and Flood Control District VB -1 Urban Storm Drainage Criteria Manual Volume 3 Wind Erosion/Dust Control (DC) EC -14 Description Wind erosion and dust control BMPs help to keep soil particles from entering Fri the air as a result of land disturbing construction activities. These BMPs include a variety of practices generally focused on either graded disturbed areas or construction roadways. For graded areas, practices such as seeding and mulching, use of soil binders, site watering, or other practices that provide prompt surface cover should be used. For construction roadways, road watering and stabilized surfaces should be considered. F t •�.� �-� � �� � "�' �tj! Photograph DC -1. Water truck used for dust suppression. Photo courtesy of Douglas County. Appropriate Uses Dust control measures should be used on any site where dust poses a problem to air quality. Dust control is important to control for the health of construction workers and surrounding waterbodies. Design and Installation The following construction BMPs can be used for dust control: ■ An irrigation/sprinkler system can be used to wet the top layer of disturbed soil to help keep dry soil particles from becoming airborne. ■ Seeding and mulching can be used to stabilize disturbed surfaces and reduce dust emissions. ■ Protecting existing vegetation can help to slow wind velocities across the ground surface, thereby limiting the likelihood of soil particles to become airborne. ■ Spray -on soil binders form a bond between soil particles keeping them grounded. Chemical treatments may require additional permitting requirements. Potential impacts to surrounding waterways and habitat must be considered prior to use. ■ Placing rock on construction roadways and entrances will help keep dust to a minimum across the construction site. ■ Wind fences can be installed on site to reduce wind speeds. Install fences perpendicular to the prevailing wind direction for maximum effectiveness. Maintenance and Removal When using an irrigation/sprinkler control system to aid in dust control, be careful not to overwater. Overwatering will cause construction vehicles to track mud off-site. Wind Erosion Control/ Dust Control Functions Erosion Control Yes Sediment Control No Site.'Material Management Moderate November 2010 Urban Drainage and Flood Control District DC -I Urban Storm Drainage Criteria Manual Volume 3 'F�MPtlp[MY'e At'N ITtp/I 111D0p h1 6i W1pAp1D �xU � �f[fldl i �L Yix I �YION ��ppAAtC WkAI LM +.4A>OfD N% n to ` TICAr>t '• 1� 7.1 CIDRY'9r S l r At'AntD'D Aae mT5 *Irk = wr m W1 S'x{[S K. W SSAntS Dwl K Y,' • NST %W I K 1't, A .y .A ImrFs I t4L I'Mt SWLL MI A U10" OEANAU AKA a CW*l LI[I1 A= Ftl = Flt; a 5111 ft. ( .(14thw3w um a1Kt. f450 Il` f 15196 r111.Ma;YY MVIFx1 NE m nr Im4 me tz la. r 541 1[Ila Lao At FR R ADPL D'qL a PLACID 5 TO a Fltl aty TU a Aa[ TD pm2m tLDngt CMAs IY ]- Sit F[1Q 3wt K AtAaD m IH taltan.-$IM tr95 r mm V AVt. APPLICATIONSILT FENQF Shee •s...,,.r� Colorado ,PCrtment of Transporkalion a' rp.l Y.a,... 4 tffi - ti. 43 J) 757 13e6 tl� - �iA� rm: U6+7 .5 r99ro Project Daxelopment Branch DDATA am A -A TOE OF SLOEE RROTECTTM TEMPORARY PShcct ANDARD PLAN NO. EROSION CONTROL M -209-1r 11—en.Wio..,AAaw.'�Dance�'u,.,=DlxNo,10 or 12 t0;f t �atl nII[ YCna. a J TH.�0.1 tlot11i0.I Y[11a. A \ VDSf A �LJOINING Hf SECTION QUAIL (PLAN ViFW) ISwuibF SNL K Ia Jlm x®Aa to Nils I= costate x [l ryl w 'a, 4X (UL I" MOX.=l[rtrj F0 M -,t .I,x bwt t ri[5 MbaW RM Yank tlp'F.tlf 13 MI III, . Iw, SIA15[S.m 'MtS nL of Hammy Aeatm SIM Mo GAPS FB M -m NAMNIL r'ew l� or S Idw A[ Rbl: ImrFs I t4L I'Mt SWLL MI A U10" OEANAU AKA a CW*l LI[I1 A= Ftl = Flt; a 5111 ft. ( .(14thw3w um a1Kt. f450 Il` f 15196 r111.Ma;YY MVIFx1 NE m nr Im4 me tz la. r 541 1[Ila Lao At FR R ADPL D'qL a PLACID 5 TO a Fltl aty TU a Aa[ TD pm2m tLDngt CMAs IY ]- Sit F[1Q 3wt K AtAaD m IH taltan.-$IM tr95 r mm V AVt. APPLICATIONSILT FENQF Shee •s...,,.r� Colorado ,PCrtment of Transporkalion a' rp.l Y.a,... 4 tffi - ti. 43 J) 757 13e6 tl� - �iA� rm: U6+7 .5 r99ro Project Daxelopment Branch DDATA am A -A TOE OF SLOEE RROTECTTM TEMPORARY PShcct ANDARD PLAN NO. EROSION CONTROL M -209-1r 11—en.Wio..,AAaw.'�Dance�'u,.,=DlxNo,10 or 12 Inlet Protection (IP) SC -6 Description Inlet protection consists of permeable barriers installed around an inlet to filter runoff and remove sediment prior to entering a storm drain inlet. Inlet protection can be constructed from rock socks, sediment control logs, silt fence, block and rock socks, or other materials approved by the local jurisdiction. Area inlets can also be protected by over -excavating around the inlet to form a sediment trap. Appropriate Uses - T —m' Install protection at storm sewer inlets that are operable during construction. Photograph IP -1. Inict protection for a curb opening inlet. Consider the potential for tracked -out sediment or temporary stockpile areas to contribute sediment to inlets when determining which inlets must be protected. This may include inlets in the general proximity of the construction area, not limited to downgradient inlets. Inlet protection is not a stand-alone BMP and should be used in conjunction with other upgradient BMPs. Design and Installation To function effectively, inlet protection measures must be installed to ensure that flows do not bypass the inlet protection and enter the storm drain without treatment. However, designs must also enable the inlet to function without completely blocking flows into the inlet in a manner that causes localized flooding. When selecting the type of inlet protection, consider factors such as type of inlet (e.g., curb or area, sump or on -grade conditions), traffic, anticipated flows, ability to secure the BMP properly, safety and other site-specific conditions. For example, block and rock socks will be better suited to a curb and gutter along a roadway, as opposed to silt fence or sediment control logs, which cannot be properly secured in a curb and gutter setting, but are effective area inlet protection measures. Several inlet protection designs are provided in the Design Details. Additionally, a variety of proprietary products are available for inlet protection that may be approved for use by local governments. If proprietary products are used, design details and installation procedures from the manufacturer must be followed. Regardless of the type of inlet protection selected, inlet protection is most effective when combined with other BMPs such as curb socks and check dams. Inlet protection is often the last barrier before runoff enters the storm sewer or receiving water. Inlet Protection (various forms) Functions Erosion Control No Sediment Control Yes Site/Material Management No Design details with notes are provided for these forms of inlet protection: IP -1. Block and Rock Sock Inlet Protection for Sump or On -grade Inlets IP -2. Curb (Rock) Socks Upstream of Inlet Protection, On -grade Inlets November 2010 Urban Drainage and Flood Control District IP -1 Urban Storm Drainage Criteria Manual Volume 3 SC -6 Inlet Protection (IP) IP -3. Rock Sock Inlet Protection for Sump/Area Inlet IP4. Silt Fence Inlet Protection fir Sump/Area Inlet IP -5. Over -excavation Inlet Protection IP -ti. Straw Bale Inlet Protection for Sump/Area Inlet CIP-I. Culvert Inlet Protection Propriety inlet protection devices should be installed in accordance with manufacturer specifications. More information is provided below on selecting inlet protection for sump and on -grade locations. Inlets Located in a Sump When applying inlet protection in sump conditions, it is important that the inlet continue to function during larger runoff events. For curb inlets, the maximum height of the protective barrier should be lower than the top of the curb opening to allow overflow into the inlet during larger stones without excessive localized flooding. If the inlet protection height is greater than the curb elevation, particularly if the filter becomes clogged with sediment, runoff will not enter the inlet and may bypass it, possibly causing localized flooding, public safety issues, and downstream erosion and damage from bypassed flows. Area inlets located in a sump setting can be protected through the use of silt fence, concrete block and rock socks (on paved surfaces), sediment control logs/straw wattles embedded in the adjacent soil and stacked around the area inlet (on pervious surfaces). over -excavation around the inlet, and proprietary products providing equivalent functions. Inlets Located on a Slope For curb and gutter inlets on paved sloping streets, block and rock sock inlet protection is recommended in conjunction with curb socks in the gutter leading to the inlet. For inlets located along unpaved roads, also see the Check Dam Fact Sheet. Maintenance and Removal Inspect inlet protection frequently. Inspection and maintenance guidance includes: ■ Inspect for tears that can result in sediment directly entering the inlet, as well as result in the contents of the BMP (e.g., gravel) washing into the inlet, ■ Check for improper installation resulting in untreated flows bypassing the BMP and directly entering the inlet or bypassing to an unprotected downstream inlet. For example, silt fence that has not been properly trenched around the inlet can result in flows under the silt fence and directly into the inlet. ■ Look for displaced BMPs that are no longer protecting the inlet. Displacement may occur following larger storm events that wash away or reposition the inlet protection. Traffic or equipment may also crush or displace the BMP. ■ Monitor sediment accumulation Upgradient of the inlet protection. 1P-2 Urban Drainage and Flood Control District November 20 10 Urban Storm Drainage Criteria Manual Volume 3 Inlet Protection {IP} SC -6 ■ Remove sediment accumulation from the area upstream of the inlet protection, as needed to maintain BMP effectiveness, typically when it reaches no more than half the storage capacity of the inlet protection. For silt fence, remove sediment when it accumulates to a depth of no more than 6 inches. Remove sediment accumulation from the area upstream of the inlet protection as needed to maintain the functionality of the BMA. ■ Propriety inlet protection devices should be inspected and maintained in accordance with manufacturer specifications. If proprietary inlet insert devices are used, sediment should be removed in a timely manner to prevent devices from breaking and spilling sediment into the storm drain. Inlet protection must be removed and properly disposed of when the drainage area for the inlet has reached Final stabilization. November 2010 Urban Drainage and Flood Control District 1P-3 Urban Storm Drainage Criteria Manual Volume 3 SC -6 Inlet Protection (IP) a INLET PROTECTION BLOCK ARD CUF8 SOCE ET PROTEC110tj INSTALLATION NOTFS 1 SEE ROCK SOCK DESIGN DETAIL FOR INSTALLATION REQUIREMENTS 2 CONCRETE "CINDER" BLOCKS SHALL BE LAID ON THE[R SIDES AROUND THE INLET IN A SINGLE ROW, ABUTTING ONE ANOTHER WITH THE OPEN END FACING AWAY FROM THE CURB. 3. GRAVEL BAGS SHALL BE PLACED AROUND CONCRETE BLOCKS, CLOSELY ABUTTING ONE ANOTHER AND JOINTED TOGETHER IN ACCORDANCE WITH ROCK SOCK DESIGN DETAIL. MINIMUM OF "SOCKSAPPROX DEG. BLOCK AND ROCK SOCK INLET PROTECnON(SEE DETAIL IP -1) CURB SOCKFLOW — IP -2. CURB ROCK SOCKS UPSTREAM OF INLET PROTECTION CURB ROCK SOCK INLET PROTECTION INSTALLATION NOTES 1. SEE ROCK SOCK DES -GN DETAIL INSTALLATION REQUIREMENTS. 2 PLACEMENT OF THE SOCK SHALL BE APPROXIMATE -_Y 30 DEGREES FROM PERPENDICULAR IN THE OPPOSITE DIRECTION OF FLOW. 3. SOCKS ARE TO BE FLUSH WITH THE CURB AND SPACED A MINIMUM OF 5 FEET APART. 4. AT LEAST TWO CURB SOCKS IN SERIES ARE REOUIRED UPSTREAM OF ON—GRAOE INLETS. I P-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 SEE ROCK SOCK DES:GN ROCK DETAIL FOR JOINTING ROCK SOCKS 16" CINDER 16" CINDER SOCKS �,=a ,. BLOCKS BLOCKS z �" , :� =i FLOW s= 2"x4" WOOD STUD = i` MIN CURB INLET 2"x4° WOOD — SECTION A — STUD IP -1a BLOCK AND ROC SOCK SUMP OR ON GRADE INLET PROTECTION BLOCK ARD CUF8 SOCE ET PROTEC110tj INSTALLATION NOTFS 1 SEE ROCK SOCK DESIGN DETAIL FOR INSTALLATION REQUIREMENTS 2 CONCRETE "CINDER" BLOCKS SHALL BE LAID ON THE[R SIDES AROUND THE INLET IN A SINGLE ROW, ABUTTING ONE ANOTHER WITH THE OPEN END FACING AWAY FROM THE CURB. 3. GRAVEL BAGS SHALL BE PLACED AROUND CONCRETE BLOCKS, CLOSELY ABUTTING ONE ANOTHER AND JOINTED TOGETHER IN ACCORDANCE WITH ROCK SOCK DESIGN DETAIL. MINIMUM OF "SOCKSAPPROX DEG. BLOCK AND ROCK SOCK INLET PROTECnON(SEE DETAIL IP -1) CURB SOCKFLOW — IP -2. CURB ROCK SOCKS UPSTREAM OF INLET PROTECTION CURB ROCK SOCK INLET PROTECTION INSTALLATION NOTES 1. SEE ROCK SOCK DES -GN DETAIL INSTALLATION REQUIREMENTS. 2 PLACEMENT OF THE SOCK SHALL BE APPROXIMATE -_Y 30 DEGREES FROM PERPENDICULAR IN THE OPPOSITE DIRECTION OF FLOW. 3. SOCKS ARE TO BE FLUSH WITH THE CURB AND SPACED A MINIMUM OF 5 FEET APART. 4. AT LEAST TWO CURB SOCKS IN SERIES ARE REOUIRED UPSTREAM OF ON—GRAOE INLETS. I P-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Inlet Protection (IP) SC -6 ROCK SOCK :T GRATE I P SEE ROCK SOCK DETAIL FOR JOINTING IP -3 ROCK SOCK SUMPAREA AREA INLET PROTECTION ROCK encu sumP/AREA INLET PROTECTION INSTALLATION NOTES 1. SEE ROCK SOCK DESIGN DETAIL FOR INSTALLATION REOUIREMENTS. 2. STRAW WATTLES/SEDIMENT CONTROL LOGS MAY BE USED IN PLACE OF ROCK SOCKS FOR INLETS IN PERVIOUS AREAS. INSTALL PER SEDIMENT CONTROL LOG DETAIL. F SFT F L_ SF 1 -T GRATE SILT FENCE (SEE SILT FENCE DESIGN DETAIL } IP -4. SILT FENCE FOR SUMP INLET PROTECTION SILT FENCE INLET PROTECTION INSTALLATION NOTES 1. SEE SILT FENCE DESIGN DETAIL FOR INSTALLATION REQUIREMENTS. 2. POSTS SHALL BE PLACED AT EACH CORNER OF THE INLET AND AROUND THE EDGES AT A MAXIMUM SPACING OF 3 FEET. 3. STRAW WATTLES/SEDIMENT CONTROL LOGS MAY BE USED IN PLACE OF SILT FENCE FOR INLETS IN PERVIOUS AREAS. INSTALL PER SEDIMENT CONTROL LOG DETAIL. November 2010 Urban Drainage and Flood Control District 1P-5 Urban Storm Drainage Criteria Manual Volume 3 SC -6 Inlet Protection (IP) SILT J p FENCE � AREA INLET SHEET I SILT FLOWTri-- IFENCE J {EC4?3 } 2:1 MAX -I- I' MIN AREAz' MAx INLET 4 ROCK FILTER L CONCENTRATED OR ROCK SOCK FLOW (USE IF FLOW IS CONCENTRATED) IP -5. OVEREXCAVATION INLET PROTECTION OVEREXCAVATION INLET PROTECTION INSTALLATION NOTES 1. THS FORM OF INLET PROTECTION IS PRIMARILY APPLICABLE FOR SITES THAT HAVE NOT YET REACHED FINAL GRADE AND SHOULD BE USED ONLY FOR INLETS WITH A RELATIVELY SMALL CONTRIBUTING DRAINAGE AREA 2. WHEN USING FOR CONCENTRATED FLOWS. SHAPE BASIN IN 2:1 RATIO WITH LENGTH ORIENTED TOWARDS DIRECTION OF FLOW. 3. SEDIMENT MUST K PERIODICALLY REMOVED FROM THE OVEREXCAVATED AREA. STRAW BALE (SEE STRAW BALE DESIGN DETAIL) - INLET GRATE IP -6. STRAW BALE FOR SUMP INLET PROTECTION RA'0 RALE AR I R INLE1 PRQTEQTIQN IN 1.w.I 1 .4TI'N NOTES 1. SEE STRAW BALE DESIGN DETAIL FOR INSTAI_LAT,ON REOUIREMENTS. 2. BALES SHALL BE PLACED IN A SINGLE ROW AROUND THE INLET WITH ENDS OF BALES T,GHTLY ABUTTING ONE ANOTHER. IP -6 Urban Drainage and Flood Controt District November 2010 Urban Stone Drainage Criteria Manual Volume 3 i �m - INLET GRATE IP -6. STRAW BALE FOR SUMP INLET PROTECTION RA'0 RALE AR I R INLE1 PRQTEQTIQN IN 1.w.I 1 .4TI'N NOTES 1. SEE STRAW BALE DESIGN DETAIL FOR INSTAI_LAT,ON REOUIREMENTS. 2. BALES SHALL BE PLACED IN A SINGLE ROW AROUND THE INLET WITH ENDS OF BALES T,GHTLY ABUTTING ONE ANOTHER. IP -6 Urban Drainage and Flood Controt District November 2010 Urban Stone Drainage Criteria Manual Volume 3 Inlet Protection {IP} SC -6 GENERAL INLET PROTECTION INSTALL6TI4.N NOTES 1. SEE PLAN VIEW FOR: —LOCATION OF INLET PROTECTION. —TYPE OF INLET PROTECTION (IP.1, IP.2, IP.3, IP.4. IP.5, IP.6) 2. INLET PROTECTION SHALL BE INSTALLED PROMPTLY AFTER INLET CONSTRUCTION OR PAVING IS COMPLETE (TYPICALLY WITHIN 48 HOURS). IF A RAINFALL/RUNOFF EVENT IS FORECAST, INSTALL INLET PROTECTION PR OR TO ONSET OF EVENT. 3. MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS. CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAII SHOULD BE USED WHEN DIFFERENCES ARE NOTED. INLET PROTECTION MAINTENANCE NOTES 1. INSPECT BMPs EACH WORKDAY. AND MAINTAIN THEM IN EFFECTIVE OPERAT NG CONDITION. MAINTENANCE OF 8MPs SHOULD BE PROACTIVE, NOT REACTIVE INSPECT BMPs AS SOON AS POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE EROSION, AND PERFORM NECESSARY MAINTENANCE. 2 FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN EFFECTIVE OPERATING CONDITION INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY. 3 WHERE SMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON DISCOVERY OF THE FAILURE. 4. SEDIMENT ACCUMULATED UPSTREAM OF INLET PROTECTION SHALL BE REMOVED AS NECESSARY TO MAINTAIN BMP EFFECTIVENESS, TYPICALLY WHEN STORAGE VOLUME REACHES 50% OF CAPACITY, A DEPTH OF 6" WHEN SILT FENCE IS USED, OR K OF THE HEIGHT FOR STRAW BALES. 5, INLET PROTECTION IS TO REMAIN IN PLACE UNTIL THE UPSTREAM DISTURBED AREA IS PERMANENTLY STABILIZED, UNLESS THE LOCAL JURISDICTION APPROVES EARLIER REMOVAL OF INLET PROTECTION IN STREETS. 6. WHEN INLET PROTECTION AT AREA INLETS IS REMOVED, THE DISTURBED AREA, SHALL BE COVERED WITH TOP SOIL, SEEDED AND MULCHED, OR OTHERWISE STABILIZED IN A MANNER APPROVED BY THE LOCAL JURISDICTION. (DETAIL ADAPTED FROM TOWN OF PARKER, COLORADO AND CITY OF AURORA, COLORADO, HOT AVAILABLE IN AUTOCAD) NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN DIFFERENCES ARE NOTED NOTE: THE DETAILS INCLUDED WITH THIS FACT SHEET SHOW COMMONLY USED, CONVENTIONAL METHODS OF INLET PROTECTION IN THE DENVER METROPOLITAN AREA. THERE ARE MANY PROPRIETARY INLET PROTECTION METHODS ON TH= MAF'KET. UDFCD NEITHER ENDORSES NOR DISCOURAGES USE OF PROPRIETARY INLET PROTECTION; HOWEVER, IN THE EVENT PROPRIETARY METHODS ARE USED, THE APPROPRIATE DETAIL FROM THE MANUFACTURER MUST BE INCLUDED IN THE SWMP AND THE BMP MUST BE INSTALLED AND MAINTAINED AS SHOWN IN THE MANUFACTURER'S DETAILS. NOTE: SOME MUNIC PAUTIES DISCOURAGE OR PROHIBIT THE USE OF STRAW BALES FOR INLET PROTECTION. CHECK WITH LOCAL JURISDICTION TO DETERMINE IF STRAW BALE INLET PROTECTION IS ACCEPTABLE. November 2010 Urban Drainage and Flood Control District IP -7 Urban Storm Drainage Criteria Manual Volume 3 Straw Bale Barrier (SBB Description A straw bale barrier is a linear wal I of straw bales designed to intercept sheet flow and trap sediment before runoff exits a disturbed area. Appropriate Uses Appropriate uses of properly installed straw bale barriers may include: ■ As a perimeter control for a site or soi I stockpile. As a sediment control at the toe of an erodible slope. SC -3 Photograph S1113-1. Straw bale trarricr used for perimcicr control. Photo courtesy of Tom Gore. ■ Along the edge of a stream or drainage Pathway to reduce sediment Iaden runoff from entering the waterway. ■ As part ofan inlet protection design in sump conditions (See Inlet Protection BMP). Do not use straw bale barriers in areas of concentrated flow or in areas where ponding is not desirable. Straw bales tend to degrade quickly, so they should generally not be used in areas where longer term disturbance is expected. Due to a history of inappropriate placement, poor installation, and short effective lifespan, the use of straw bales is discouraged or prohibited by some communities. Design and Installation The maximum recommended tributary drainage area per 100 lineal feet of straw bale barrier is 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3: I; longer and steeper slopes require additional measures. Design details with notes are provided in Detail S1313-1. To be effective, bales must be installed in accordance with the design details with proper trenching, staking, and binding. Jute and cotton string must not be used to bind the straw bale. The bales should be certified weed -free prior to use. Maintenance and Removal Check bales for rotting and replace as necessary. Straw bales degrade, and rotting bales require replacement on a regular basis (as often as every three months) depending on environmental conditions. Check for undercutting, bypassed flows, and displacement. Repair by properly re -installing the straw bale barrier and repairing washouts around the bales. Remove sediment accumulated behind the bale when it reaches one-quarter of the bale height. Remove and properly dispose of the straw bale once the upstream area has been stabilized. Areas of disturbance beneath the bale should be seeded and mulched when the bale is removed. Straw Bale Barrier Functions Erosion Control No Sediment Control Moderate Site/Material Management No November 2010 Urban Drainage and Flood Control District S1313-1 Urban Storm Drainage Criteria Manual Volume 3 SC -3 Straw Bale Barrier {SBB BALE LENGTH 36- TYP 2"X2"X24 A STAKE 6 E BINDIN OR TW STRAW BALE SBB FLOW ACKFILL AND COMPACT XCAVATED TRENCH SOIL G WIRE INE i 4" MIN BALE WIDTH IB" TYP TRENCH FOR STRAW BALE kLE WID 2"X2"X24- IB' TYP /- STAKE BACKFILL AND COMPACT EXCAVATED TRENCH SO:L 18" TIP FLOW 6 " MIN -j H L 4^ M,N SECTION A SBB--1. STRAW BALE SBB-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Straw Bale Barrier (SBB) SC -3 STRAW SALE INSTALLArIOU NOTES 1. SEE PLAN VIEW FOR. -LOCATIONS) OF STRAW BALES. 2 STRAW BALES SHALL CONSIST OF CERTIFIED WEED FREE STRAW OR HAY LOCAL JURISDICTIONS MAY REQUIRE PROOF THAT SALES ARE WEED FREE. 3 STRAW BALES SHALL CONSIST OF APPROXIMATELY 5 CUB -C FEET OF STRAW OR HAY AND WEIGH NOT LESS THAN 35 POUNDS. 4. WHEN STRAW BALES ARE USED IN SERIES AS A BARR ER, THE END OF EACH BALE SHALL BE TIGHTLY ABUTTING ONE ANOTHER_ 5. STRAW BALE DIMENSIONS SHALL BE APPROXIMATELY 36"X18"X18'. 6 A UNIFORM ANCHOR TRENCH SHALL BE EXCAVATED TO A DEPTH OF 4" STRAW BALES SHALL BE PLACED SO THAT BINDING TW -NE IS ENCOMPASSING THE VERTICAL SIDES OF THE BALE(S). ALL EXCAVATED SOIL SHALL BE PLACED ON THE UPH°LL SZE OF THE STRAW BALE(S) AND COMPACTED. 7. TWO (2) WOODEN STAKES SHALL BE USED TO HOLD EACH BALE IN PLACE. WOODEN STAKES SHALL BE 2"X2"X24". WOODEN STAKES SHALL BE DRIVEN 6" INFO THE GROUND. STRAW SALE_ MAINTENANCE NOTES 1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM 'N EFFECTIVE OPERAT NG CONDITION. MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE INSPECT BMPs AS SOON AS POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE EROSION, AND PERFORM NECESSARY MAINTENANCE 2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN EFFECTIVE OPERATING COND TION INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY, 3. WHERE BMP9 HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON DISCOVERY OF THE FAILURE - 4 STRAW BALES SHALL BE REPLACED IF THEY BECOME HEAVILY SOILED, ROTTEN, OR DAMAGED BEYOND REPAIR. 5 SEDIMENT ACCUMULATED UPSTREAM OF STRAW BALE BARRIER SHALL BE REMOVED AS NEEDED TO MAINTAIN FUNCTIONALITY OF THE BMP. TYP CALLY WHEN DEPTH OF ACCUMULATED SEDIMENTS IS APPROXIMATELY Y OF THE HEIGHT OF THE STRAW BALE BARRIER 6 STRAW BALES ARE TO REMAIN IN PLACE UNTIL THE UPSTREAM DISTURBED AREA IS STABILIZED AND APPROVED BY THE LOCAL JURISDICTION 7. WHEN STRAW BALES ARE REMOVED, ALL DISTURBED AREAS SHALL BE COVERED WITH TOPSOIL, SEEDED AND MULCHED OR OTHERWISE STAB;LIZED AS APPROVED BY LOCAL JURISDICTION. (DETAILS ADAPTED FROM TOWN OF PARKER, COLORADO. NOr AVAILABLE IN AUTOCAO) NQLL MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS, CONSULT WITH LOCAL JURISDICTIONS AS 10 WHICH DETAIL SHOULD BE USED WHEN DIFFERENCES ARE NOTED, November 2010 Urban Drainage and flood Control District SBB-3 Urban Storm Drainage Criteria ManTlal Volume 3 Sediment Control Log (SCL) SC -2 Description A sediment control log is a linear roil made of natural materials such as straw, coconut fiber, or other fibrous material trenched into the ground and held with a wooden stake. Sediment control logs are also often referred to as "straw wattles." They are used as a sediment barrier to intercept sheet flow runoff from disturbed areas. Appropriate Uses Sediment control logs can be used in the following applications to trap sediment: ■ As perimeter control for stockpiles and the site. ■ As part of inlet protection designs. ■ As check dams in small drainage ditches. (Sediment control logs are not intended for use in channels with high flow velocities.) ■ On disturbed slopes to shorten flow lengths (as an erosion control). Photographs SCL-1 And SCL-2. Sediment control logs used as 1) a perimeter control around a soil stockpile; and, 2) as a "J -hook" perimeter control at the corner of a construction site. ■ As part of multi -layered perimeter control along a receiving water such as a stream, pond or wetland. Sediment control logs work well in combination with other layers of erosion and sediment controls. Design and Installation Sediment control logs should be installed along the contour to avoid concentrating flows. The maximum allowable tributary drainage area per 100 lineal feet of sediment control log, installed along the contour, is approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only applies to sediment control logs installed along the contour. When installed for other uses, such as perimeter control, it should be installed in a way that will not produce concentrated flows. For example, a "1 -hook" installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather than concentrate and cause erosive conditions parallel to the BMP. Sediment Control Lo Functions Erosion Control Moderate Sediment Control Yes Site.'Material Management No November 2010 Urban Drainage and Flood Control District SCL-I Urban Storm Drainage Criteria Manual Volume 3 SC --2 Sediment Control Log (SCL) Ailhough sediment control logs initially allow runoff to flow through the BMP, they can quickly become a barrier and should be installed is if they are impermeable. Design details and notes for sediment control logs are provided in Detail SCL-I. Sediment logs must be properly trenched and staked into the ground to prevent undercutting, bypassing and displacement. When installed on slopes, sediment control logs should be installed along the contours (Le., perpendicular to flow). Improper installation can lead to poor performance. Be sure that sediment control Iogs are properly trenched, anchored and tightly jointed_ Maintenance and Removal Be aware that sediment control logs will eventually degrade. Remove accumulated sediment before the depth is one-half the height of the sediment log and repair damage to the sediment log, typically by replacing the damaged section. Once the upstream area is stabilized, remove and properly dispose of the logs. Areas disturbed beneath the logs may need to be seeded and mulched. Sediment control logs that are biodegradable may occasionally be Ieft in place (e.g., when logs are used in conjunction with erosion control blankets as permanent slope breaks). However, removal of sediment control logs after final stabilization is typically recommended when used in perimeter control, inlet protection and check dam applications. SCL-2 Urban Drainage and Flood Control District November 2010 Urban Storm DraiTrage Criteria Manual Volume 3 Sediment Control Log (SCL) SC -2 —=—=—sm— L 3" 4' MA CENTER (TYP. jU 6" -� % DIAM. FLOW OF 5CL (TYP.) S U4" x 1}g" x 18" (MIN) WOODEN STAKE 9" DIAMETER (MIN) SEDIMENT CONTROL LOG DIAM. NOTE: LARGER SC DIAMETER SEDIMENT CONTROL LOGS MAY NEED TO BE EMBEDDED DEEPER. SEDIMENT CONTROL LOG CENTER STAKE IN CONTROL LOG COMPACTED EXCAVATED 3" 9" DIAMETER (MN) TRENCH SOIL SEDIMENT CONTROL LOG FLOW I I �rYs AM, SCL (TYP.) SECTION A 12" OVERLAP rok 1Y2" x 1i2" x 18" (MIN) WOODEN STAKE 9" DIAMETER (MIN) ❑ SEDIMENT CONTROL LOG SEDIMENT CONTROL LOG JOINTS SCL-1. SEDIMENT CONTROL LOG November 2010 Urban Drainage and Flood Control District SCI. -3 Urban Storm Drainage Criteria Manual Volume 3 SC -2 Sediment Control Log (SCL) COMPACTED EXCAVATED TRENCH SOIL , FLOW 3" CENTER STAKE IN CONTROL LOG S" DIAMETER (MIN) SEDIMENT CONTROL LOG - PLACE LOG AGAINST BACK OF CURB Ys D'AM. SCL (TYP.) SCL-2. SEDIMENT CONTROL LOG AT BASK OF CURB CENT --R SLAKE tN CONTROL LOG 3. I 9" DIAMETER (MIN) SEDIMENT CONTROL LOG TREE wN (TYPICA. r ys DIAMI. SCL (TYP.) CURB ` FLOW �— L P E. COMROf, LOG A6I INST'S)DCWAL ti*' 4, SCL-3, SEDIMENT CONTROL LOG AT SIDEWALK WITH TREE LAWN STAKING AT 4' MAX. ON CENTER (TYP.), VERTICAL SPACING VARIES DEPEND NG ON SLOPE mi., Al F'LM MLILK Ur CONSTRUCTION SITE SCL-4. SEDIMENT CONTROL LOGS TO CONTROL SLOPE LENGTH SCL-1 Urban Drainage and Flood Control District November 2010 Urban Storrs Drainage Criteria Manual Volume 3 Sediment Control Log (SCL) SC -2 SEDIMENT CONTROL LOG INSTALLATION NOTES 1. SEE PLAN VIEW FOR LOCATION AND LENGTH OF SEDIMENT CONTROL LOGS. 2 SEDIMENT CONTROL LOGS THAT ACT AS A PERIMETER CONTROL SHALL BE INSTALLED PRIOR TO ANY UPGRADIENT LAND—DISTURBING ACTIVITIES. 3 SEDIMENT CONTROL LOGS SHALL CONSIST OF STRAW, COMPOST. EXCELSIOR OR COCONUT FIBER, AND SHALL BE FREE OF ANY NOXIOUS WEED SEEDS OR DEFECTS INCLUDING RIPS, HOLES AND OBVIOUS WEAR 4. SEDIMENT CONTROL LOGS MAY BE USED AS SMALL CHECK DAMS IN DITCHES AND SWALES HOWEVER, THEY SHOULD NOT BE USED IN PERENNIAL STREAMS OR HIGH VELOCITY DRAINAGE WAYS. S. IT IS RECOMMENDED THAT SEDIMENT CONTROL LOGS BE TRENCHED INTO THE GROUND TO A DEPTH OF APPROXIMATELY Ys OF THE DIAMETER OF THE LOG IF TRENCHING TO THIS DEPTH IS NOT FEASIBLE AND/OR DESIRABLE (SHORT TERM INSTALLATION WITH DESIRE NOT TO DAMAGE LANDSCAPE) A LESSER TRENCHING DEPTH MAY BE ACCEPTABLE WITH MORE ROBUST STAKING 6 THE UPHILL SIDE OF THE SEDIMENT CONTROL LOG SHALL BE BACKFILLED WITH SOIL THAT IS FREE OF ROCKS AND DEBRIS. THE SOIL SHALL BE TIGHTLY COMPACTED INTO THE SHAPE OF A RIGHT TRIANGLE USING A SHOVEL OR WEIGHTED LAWN ROLLER. 7. FOLLOW MANUFACTURERS' GUIDANCE FOR STAKING. IF MANUFACTURERS' INSTRUCTIONS DO NOT SPECIFY SPACING, STAKES SHALL BE PLACED ON 4' CENTERS AND EMBEDDED A MINIMUM OF 6" INTO THE GROUND 3' OF THE STAKE SHALL PROTRUDE FROM THE TOP OF THE LOG. STAKES THAT ARE BROKEN PRIOR TO INSTALLATION SHALL BE REPLACED. SEDIMENT CONTROL, LOG MAINTENANCE NOTES 1. INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION. MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE EROSION, AND PERFORM NECESSARY MAINTENANCE. 2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN EFFECTIVE OPERATING CONDITION. INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY. 3. WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON DISCOVERY OF THE FAILURE. 4. SEDIMENT ACCUMULATED UPSTREAM OF SEDIMENT CONTROL LOG SHALL BE REMOVED AS NEEDED TO MAINTAIN FUNCTIONALITY OF THE BMP, TYPICALLY WHEN DEPTH OF ACCUMULATED SEDIMENTS 15 APPROXIMATELY J5 OF THE HEIGHT OF THE SEDIMENT CONTROL LOG. 5. SEDIMENT CONTROL LOG SHALL BE REMOVED AT THE END OF CONSTRUCTION, IF DISTURBED AREAS EXIST AFTER REMOVAL, THEY SHALL BE COVERED WITH TOP SOIL, SEEDED AND MULCHED OR OTHERWISE STABILIZED IN A MANNER APPROVED BY THE LOCAL JURISDICTION, (DETAILS ADAPTED FROM TOWN OF PARKER, COLORADO. JEFFERSON COUNTY COIAR400, DOUGLAS COUNTY. COLORADO. AND CITY OF AURORA, COLORADO, NOT AVAILABLE IN ALITOCAD) NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS. CONSULT WITH LOCAL ,JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN DIFFERENCES ARE NOTED, November 2010 Urban Drainage and Flood Control District SCL-5 Urban Storm Drainage Criteria Manual Volume 3 Silt Fence (SF) SC -1 Description A silt fence is a woven geotextile fabric attached to wooden posts and trenched into the ground. It is designed as a sediment barrier to intercept sheet flow runoff from disturbed areas. Appropriate Uses A silt fence can be used where runoff is conveyed from a disturbed area as sheet flow. Silt fence is not designed to receive concentrated flow or to be used as a filter fabric. Typical uses include: ■ Down slope of a disturbed area to accept sheet flow. ■ Along the perimeter of receiving water such as a stream, pond or wetland. ■ At the perimeter of a construction site. Design and Installation Photograph SF -I. Silt fence creates a sediment barrier, forcing sheet flow runoff to evaporate or infiltrate. Silt fence should be installed along the contour of slopes so that it intercepts sheet flow. The maximum recommended tributary drainage area per 100 lineal feet of silt fence, installed along the contour, is approximately 0.25 acres with a disturbed slope Iength of up to 150 feet and a tributary slope gradient no steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only applies to silt fence installed along the contour. Silt fence installed for other uses, such as perimeter control, should be installed in a way that will not produce concentrated flows. For example, a ".l -hook" instaIIation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather than concentrate and cause erosive conditions parallel to the silt fence. See Detail SF -I for proper silt fence installation, which involves proper trenching, staking, securing the fabric to the stakes, and backfilling the silt fence. Properly installers silt fence should not be easily pulled out by hand and there should be no gaps between the ground and the fabric. Silt fence must meet the minimum allowable strength requirements, depth of installation requirement, and other specifications in the design details. Improper installation of silt fence is a common reason for silt fence failure; however, when properly installed and used for the appropriate purposes, it can be highly effective. Silt Fence Functions Erosion Control No Sediment Control Yes Site?Matesrial Management No November 2010 Urban Drainage and Flood Control District SF -I Urban Storm Drainage Criteria Manual Volume 3 SC -1 Maintenance and Removal Inspection of silt fence includes observing the material for tears or holes and checking for slumping fence and undercut areas bypassing flows. Repair of silt fence typically involves replacing the damaged section with a new section. Sediment accumulated behind silt fence should be removed, as needed to maintain BMP effectiveness, typically before it reaches a depth of b inches. Silt fence may be removed when the upstream area has reached final stabilization. Silt Fence (SF) Photograph SF -2. When silt fence is not installed along the contour, a "J -hook" installation may be appropriate to ensure that the BMP does not create concentrated (low parallel to the silt fence. Photo courtesy of Tom Gore. SF -2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Silt Fence (SF) SC -1 Sr_Sr-Sr FL EXISTING GROUND SILT FENCE GEOTEXTILE A TED 1LL 1 N 18" MSN 14" MIN COMPAC BACK'I 6" MI A7 LEAST 10" OF SILT FENCE TAIL' SHALL BE BURIED JOIN IRST ROTATE SECOND POSTS SHALL BE JOINED AS SHOWN. THEN ROTATED 180 DEG, IN DIRECTION SHOWN AND DRIVEN INr0 THE GROUND Ih..N I�" (RECOMMENDED) WOODEN FENCE PSPACING OST WITH e10' MAX SILT FENCE 36" TYP -48" ` POSTS SHALL OVERLAP AT JOINTS SO THAT NO GAPS EXIST IN SILT FENCE THICKNESS OF GEOTEXTiLE HAS BEEN EXAGGERATED, TYP SECTION A SF -1. SIFT FENCE SF November 2010 Urban Drainage and Flood Control District SF -3 Urban Storm Drainage Criteria Manual Volume 3 SC -1 Silt Fence (SF) SILT FENCE INSTALLATION NOTES 1. SILT FENCE MUST BE PLACED AWAY FROM THE TOE OF THE SLOPE TO ALLOW FOR WATER PONDING. SILT FENCE AT THE TOE OF A SLOPE SHOULD BE NSTALLED IN A FLAT LOCATION AT LEAST SEVERAL FEET (2-5 FT) FROM THE TOE OF THE SLOPE TO ALLOW ROOM FOR PONDING AND DEPOSITION. 2. A UNIFORM 6" X 4" ANCHOR TRENCH SHALL BE EXCAVATED USING TRENCHER OR SILT FENCE INSTALLATION DEVICE. NO ROAD GRADERS. BACKHO£S, OR SIMILAR EQUIPMENT SHALL BE USED. 3 COMPACT ANCHOR TRENCH BY HAND WITH A "JUMPING JACK" OR BY WHEEL ROLLING. COMPACTION SHALL BE SUCH THAT SILT FENCE RES STS BEING PULLED OUT OF ANCHOR TRENCH BY HAND 4. SILT FENCE SHALL BE PULLED TIGHT AS IT IS ANCHORED TO THE STAKES. THERE SHOULD BE NO NOTICEABLE SAG BETWEEN STAKES AFTER IT HAS BEEN ANCHORED TO THE STAKES. 5 SILT FENCE FABRIC SHALL BE ANCHORED TO THE STAKES USING 1" HEAVY DUTY STAPLES OR NAILS WITH 1" HEADS STAPLES AND NAILS SHOULD BE PLACED 3" ALONG THE FABRIC DOWN THE STAKE. 6 AT THE END OF A RUN OF SILT FENCE ALONG A CONTOUR, THE SILT FENCE SHOULD H£ TURNED PERPENDICULAR TO THE CONTOUR TO CREATE A "J -HOOK " THE "J—HOOK" EXTENDING PERPENDICULAR TO THE CONTOUR SHOULD BE OF SUFFICIENT LENGTH TO KEEP RUNOFF FROM FLOWING AROUND THE END OF THE SILT FENCE (TYPICALLY 10' — 20'). 7. SILT FENCE SHALL BE INSTALLED PRIOR TO ANY LAND DIS"URSING ACTIVITIES. SILT FENCE MAINTENANCE NOTES 1 INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION. MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE NSPECT BMPs AS SOON AS POSSIBLE (AND A' -WAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE EROSION, AND PERFORM NECESSARY MA,NTENANCE. 2 FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN EFFECTIVE OPERATING CONDITION. NSPECTIONS AND CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY. 3. WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON DISCOVERY OF THE FAILURE. 4. SEDIMENT ACCUMULATED UPSTREAM OF THE SILT FENCE SHALL BE REMOVED AS NEEDED TO MAINTA'N THE FUNCTIONALITY OF THE BMP, TYPICALLY WHEN DEPTH OF ACCUMULATED SEDIMENTS IS APPROXIMATELY 6". 5. REPAIR OR REPLACE SILT FENCE WHEN THERE ARE SIGNS OF WEAR, SUCH AS SAGGING, TEARING, OR COLLAPSE. 6. SILT FENCE IS TO REMAIN IN PLACE UNTIL THE UPSTREAM DISTt:RBED AREA IS STABILIZED AND APPROVED BY THE LOCAL JURISDICTION, OR IS REPLACED BY AN EQUIVALENT PERIMETER SEDIMENT CONTROL BMP. 7. WHEN SILT FENCE IS REMOVED, ALI DISTURBED AREAS SHALL BE COVERED WITH TOPSOIL, SEEDED AND MULCHED OR OTHERWISE STAB-LIZED AS APPROVED BY LOCAL JURISDICTION. (DETAIL ADAPTED FROM TOWN OF PARKER, COLORADO AND CITY OF AURORA, NOT AVAILABLE IN AUTOCAD) NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAIL SHOJLD BE USED WHEN DIFFERENCES ARE NOTED. SF -4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 ri [!I{�r liar y l �Ilx IU C.rS�tixl� B y RGA L fB J ISON&TRIC VIE PLAN VIEW r nD. � Ssrls r N 1.1p arm lIN 1 SECTION O -D EROSION LOC CULVERT INLET PRfl7ECTi0N � . v Yin la' 1 SECTION A -A vests: 1. IIw51lN 1= oW A 'I! a UXK awl m R.cts 5 lD w ltU Hma R 6 4S[ M nMwt SrAxa WXllw. !. to : 7xll t[ R.WH CMlpl Ct6 1, hex IWS rlMta r a. ��'—• UP 46t. 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W732 , ,�„ GM w1a..a7o21172 7462 EROSION CONTROL>♦A zos-I c1_ amr .L707127r-"2D,r„s r.- __ -_ Pro eat Development Branch DD/LTA 1.1,.1 e1 Pnnu='rWopnanl elanCN w AIr +, 2e12 Shcel No. I of 12 Q LK Street Sweeping and Vacuuming (SS) SM -7 Description Street sweeping and vacuuming remove sediment that has been tracked onto roadways to reduce sediment transport into storm drain systems or a surface waterway. Appropriate Uses Use this practice at construction sites where vehicles may track sediment offsite onto paved roadways. Design and Installation 0 p Photograph SS -t. A street sweeper removes sediment and potential Street sweeping or vacuuming should be pollutants along the curb line at a construction site, Photo courtesy of conducted when there is noticeable Tom Gore. sediment accumulation on roadways adjacent to the construction site. Typically, this will be concentrated at the entrance/exit to the construction site. Well-maintained stabilized construction entrances, vehicle tracking controls and tire wash facilities can help reduce the necessary frequency of street sweeping and vacuuming. On smaller construction sites, street sweeping can be conducted manually using a shovel and broom. Never wash accumulated sediment on roadways into storm drains. Maintenance and Removal ■ Inspect paved roads around the perimeter of the construction site on a daily basis and more frequently, as needed. Remove accumulated sediment, as needed. ■ Following street sweeping, check inlet protection that may have been displaced during street sweeping. ■ Inspect area to be swept for materials that may be hazardous prior to beginning sweeping operations. Street Sweeping/ Vacuuming Functions Erosion Control No Sediment Control Yes Site/Material Management Yes November 2010 Urban Drainage and Flood Control District SS -1 Urban Storm Drainage Criteria Manual Volume 3 Stabilized Staging Area (SSA) SM -6 Description A stabilized staging area is a clearly designated area where construction equipment and vehicles, stockpiles, waste bins, and ocher construction -related materials are stored, The contractor office trailer may also be located in this area. Depending on the size of the construction site, more than one staging area may be necessary. Appropriate Uses Most construction sites will require a staging area, which should be clearly Photograph SSA -t. Example ora staging area with a gravel surface to designated in SWMP drawings. The layout prevent mud tracking and reduce runoff. Photo courtesy of Douglas of the staging area may vary depending on County. the type of construction activity. Staging areas located in roadways due to space constraints require special measures to avoid materials being washed into storm inlets. Design and Installation Stabilized staging areas should be completed prior to other construction activities beginning on thy: site, Major components of a stabilized staging area include, ■ Appropriate space to contain storage and provide for loading/unloading operations, as well as parking if necessary. ■ A stabilized surface, either paved or covered, with 3 -inch diameter aggregate or largccr. ■ Perimeter controls such as silt fence, sediment control logs, or other measures. ■ Construction fencing to prevent unauthorized access to construction materials. ■ Provisions for Good Housekeeping practices related to materials storage and disposal, as described in the Good Housekeeping BMP Fact Sheet. ■ A stabilized construction entrancefexit, as described in the Vehicle Tracking Control BMA Fact Sheet, to accommodate traffic associated with material delivery and waste disposal vehicles. Over -sizing the stabilized staging area may result in disturbance of existing vegetation in excess of that required for the project. This increases costs, as well as requirements for long-term stabilization following the Stabilized Staging Area construction period. When designing the stabilized staging area, minimize the area of disturbance to the extent practical. Functions Erosion Control Yes Sediment Control Moderate Site/Material Yes November 2010 Urban Drainage and Flood Control District SSA -I Urban Storm Drainage Criteria Manual Volume 3 I] SM -6 Stabilized Staging Area (SSA) Minimizing Long -Term Stabilization Requirements ■ Utilize off-site parking and restrict vehicle access to the site. ■ Use construction mats in lieu of rock when staging is provided in an area that will not be disturbed otherwise. ■ Consider use of a bermed contained area for materials and equipment that do not require a stabilized surface. ■ Consider phasing of staging areas to avoid disturbance in an area that will not be otherwise disturbed. See Detail SSA -1 for a typical stabilized staging area and SSA -2 for a stabilized staging area when materials staging in roadways is required. Maintenance and Removal Maintenance of stabilized staging areas includes maintaining a stable surface cover of gravel, repairing perimeter controls, and following good housekeeping practices. When construction is complete, debris, unused stockpiles and materials should be recycled or properly disposed. In some cases, this will require disposal of contaminated soil from equipment leaks in an appropriate landfill. Staging areas should then be permanently stabilized with vegetation or other surface cover planned for the development. SSA -2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Stabilized Staging Area (SSA) SM -6 SF/CF SF/CF Fr EA ONSITE v CONSTRUCTION 'ni VEHIC E CONSTRUCTION ` l SITE ACCESS 1 1 0 'f STABILIZED CONSTRUCTION ENTRANCE (SEE ut� DETAILS VTC - I TO VrC-3) PARKING (tF NEEDED) U _ MATERIAL STORAGE CONSTRUCTION TRAILERS 3" M -N. THICKNESS GRANULAR MATERIAL SSA AREA U SF/CF SF/CF SILT FENCE OR CONSTRUCTION FENCING AS NEEDED EXISTING ROADWAY SSA -1. STABILIZED STAGING AREA fA$ILIiFD`,TA ..INC _. O:t A I.YSTAL°.A.TI+7N NO 1 SEE PLAN VIEW =0R —LOCATION OF STAGING AREA(S). —CONTRACTOR MAY ADJUST LOCATION AND SIZE OF STAGING AREA WITH APPROVAL FROM THE LOCAL JURSD:CTION. 2. STAB'LIZED STAGING AREA SHOULD BE APPROPRIATE FOR THE NEEDS OF THE SITE. OVERSIZING RESULTS IN A LARGER AREA TO STABILIZE FOLLOWING CONSTRUCTION. 3, STAG -NG AREA SHALL BE STABILIZED PRIOR TO OTHER OPERATIONS ON THE SITE. 4, THE STABILIZED STAGING AREA SHALL CONSIST OF A MINIMUM 3" THICK GRANULAR MATERIAL - 5_ UNLESS OTHERWISE SPECLFIED BY LOCAL JURISDICTION, ROCK SHALL CONSIST OF DOT SECT. #703, AASHTO #3 COARSE AGGREGATE OR 6" (MINUS) ROCK. 6 ADDITIONAL PERIMETER BMPs MAY BE REQUIRED INCLUDING BUT NOT LIMITED TO SILT FENCE AND CONSTRUCT=ON FENCING. STABILIZED STAGING AREA MAINTENANCE NOTES 1 INSPECT BMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION, MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE, INSPECT BMPs AS SOON AS POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE EROSION, AND PERFORM NECESSARY MAINTENANCE. 2 FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPS IN EFFECTIVE OPERATING CONDITION INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY. 3. WHERE BMPs HAVE FAILED. REPAIR OR REPLACEMENT SHOULD BE: INITIATED UPON D:SCOVERY OF THE FAILURE. 4_ ROCK SHALL BE REAPPLIED OR REGRADED AS NECESSARY IF RUTTING OCCURS OR UNDERLYING SUBGRADE BECOMES EXPOSED Novemher 2010 Urban Drainage and Flood Control District SSA -3 Urban Storm Drainage Criteria Manual Volume 3 SM -6 Stabilized Staging Area (SSA 5. STABILIZED STAGING AREA SHALL BE ENLARGED IF NECESSARY TO CONTAIN PARKING, STORAGE, AND UNLOADING/LOADING OPERATIONS. 6 THE STABILIZED STAGING AREA SHALL BE REMOVED AT THE END OF CONSTRUCTION THE GRANULAR MATERIAL SHALL BE REMOVED OR, IF APPROVED BY THE LOCAL JURISDICTION, USED ON SITE, AND THE AREA COVERED WITH TOPSOIL, SEEDED AND MULCHED OR OTHERWISE STABILIZED IN A MANNER APPROVED BY LOCAL JURISDICTION NOTE: MANY MUNICIPALITIES PROHIBIT THE USE OF RECYCLED CONCRETE AS GRANULAR MATERIAL FOR STABILIZED STAGING AREAS DUE TO DIFFICULTIES WITH RE-ESTABLISHMENT OF VEGETATION IN AREAS WHERE RECYCLED CONCRETE WAS PLACED. NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS. CONSULT WITH LOCAL JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN DIFFERENCES ARE NOTED (DETAILS ADAPTED FRom DOUGLAS COt1NTY, COLORADO, NOT AVAILABLE 1N AUTOCAO) SSA -4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Appendix D Example Inspection Form COLORADO DEPARTMENT OF TRANSPORTATION STORMWATER FIELD INSPECTION REPORT - ACTIVE CONSTRUCTION (1) Project Name: COOT Project Engineer/Representative: 1(5) Inspector(s) (Name and Title): 1(6) COOT Project Number: 1(7) Project Code (Sub Account #): I(8) CDPS-SCP Certification#: (9) CDOT (10) Date of Project Inspection: Region: (11) Weather at Time of Inspection: © Routine Inspection: (minimum every 14 Calendar Days) ❑ Runoff Event: (Post -storm event Inspections must be conducted within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion. If no construction activities will occur following a storm event, post -storm event inspections shall be conducted prior to re -commencing construction activities, but no later than 72 hours following the storm event. The occurrence of any such delayed inspection must be documented in the Inspection record.) Routine inspections still must be conducted every 14 calendar days. Storm Start Dale: Approximate End Time of Storm (hrs): ❑ Third Party Request: ❑ Winter Conditions Inspections Exclusion: Inspections are not required at sites where construction activities are temporarily halted, snow cover exists over the entire site for an extended period, @nd melting conditions posing a risk of surface erosion do not exist. This exception is applicable only during the period where melting conditions do not exist, and applies to the routine 14 -day inspections, as well as the post -storm -even) inspections. If visual Inspection of the site verifies that all of these conditions are satisfied, document the conditions in section 16 (General Notes) and proceed to section 19 (Inspection Certification). Documentation must include: dates when snow cover occurred, date when construction activities ceased, and date when melting conditions began. ❑ Other: (13) SWMP MANAGEMENT (14) CURRENT CONSTRUCTION ACTIVITIES - Yes No NA of disturbed area at the time of I the inspection: Acres a Is the SWMP notebook located on site? (b) Are changes to the SWMP documents noted and approved? c) Are the inspection reports retained in the SWMP notebook? (d) Are corrective actions from the last inspection completed? (e) Is a Spill Prevention Control and Countermeasure Plan retained at the project site? 1—HEstimate (f) Is a list of potential pollutants retained at the site? I I (IS) BMPs ON SITE AT TIME OF INSPECTION 'See Inspection Report Instructions for more detail. In SWMP Used Not Needed at this time In SWMP 1 FUZ7Not Needed at this time (a) EROSION CONTROL BMPs ON SITE (b) SEDIMENT CONTROL BMPs ON SITE Seeding Cl ❑ ❑ Stabilized Const. Entrance ❑ J ❑ Mulching/Mulch Tackifier ❑ ❑ ❑ Sediment Trap ❑ ❑ ❑ Soil Binder ❑ ❑ ❑ Inlet Protection' ❑ ❑ ❑ Soil Retention Blankets ❑ ❑ ❑ Sediment Basin Cl ❑ ❑ Embankment Protector" U u J Perimeter Control` U U J Grading Techniques' ❑ ❑ ❑ Other: ❑ 1❑ ❑ Berm/Diversion Check Dams" U ❑ J ❑ ❑ ❑ (d) MATERIALS HANDLING, SPILL PREVENTION, WASTE MANAGEMENT AND GENERAL POLLUTION PREVENTION Outlet Protection' ❑ :J U Stockpile Management* ❑ U U Other: (c) BMPs FOR SPECIAL CONDITIONS ❑ O ❑ Materials Management' Concrete Waste Management" Saw Water Management' ❑ ❑ ❑ ❑ ❑ ❑ ❑ U ❑ Dewatering Structure U U fJ Solid Wastelirash Management ❑ U D Temp. Stream Crossing ❑ ❑ ❑ Street Sweeping ❑ ❑ ❑ Clear Water Diversion U J J Sanitary Facility' U J U Sensitive Area Fencing ❑ ❑ ❑ Vehicle and Equip. Management ❑ ❑ ❑ Other: I U J 1 ❑ Other: ❑ J J page 1 of 5 COOT Form 81175 7111 m z O V a LU a w m a O V w N w N a t N z O U ac z O V T L {sago (D m c N 'a M r CD EL 3: w m c m ` o m m c m U ¢ O N CD a O O10 O Q N W C 5 N N• O .a c C3� U N O 0Y 41 ca ,= c 0 IV UO 1 D U a O ala) OIO m C C lu O Ucaa CL coa CD � N rr N _ 0 �0 N N LL = l0 CL •- r _ U D .N C N 6f D U L O 2C - N 4O dl C Oc0 ca T) 4) ID N cw- ?N a O"rn K N c C p CD l0 NN � C1 Z CW f0 '5 y N - t l0 ca q1U N � - s N C O l0 to O CD �y v r, W O CD CL ca tm O N N d bl O O r j N E :+ m O O 00 m O 2 d N a N O M G C 3: C E .=o= O C o Q- - co C ay moo oto R �m � v�0 a)Nrn W w L m Q a E c :Q c � g vi -0 d) N cd y Ca 0 =mom fi0 -aoa� ca -0 {m. 14a mo a0i vi 0 C •°3 c E ACL 0ca0 ac m C f0 O.Gi CL � 47 Qt -0 0 2O o m a w c, co c El � a)E L N Q r7, N a) 0—CNS n E C= CD Q3 O CO C- m N E Ed m ai a�'rn o w� cpm E E D y U -O N N '� Om 'ca►`n cE a 2 u ° r- oat y to mo OC �m c N N 0.0 3 _ c0i Ts 0O '" N C G mrr�n °1�m ctn cmc ---Om O I- ? N Q n c U m of 5 w w c IL m m C O 0 -j CDOT Form O o 176 7111 d .!C N QWI N ami 7 O a Op C O E O a m 9 V O V O C O Q- U a7 IL m m C O 0 -j CDOT Form O o 176 7111 N a O z a C Q1 C'3 Cf c U a N O N C O Q a 'i `1 O U ca co Z a NO z N a a c ❑ US} w a ❑�`` c12w o a C- U C 22 3 'N jry rll O y C r0 CL E CO _ r N O N CL co L)a: a CL N r a z o ECO O U 0 C ca IU O a G N E 2' t O U CO w p o w G ca CbCa m 3 cr) L a a o O L a N O 0 CO o C a) til O U a 0.0 c-m9'm `1 X Gml ca, = page3 of 5 N p m d u o a 3 2 O mL „Y i N O LU U O N 12 c co .O a m CL r- C O O c tm V La N d Q R C m O O c a E c o?.o- m O' N o `- �' c CD E E z N O O Op_ .a m ID Y c M m v c' J m 8 'E Q. 'E N C C a 0-- D m a 10 C= O EE c Cr E U p L a d O C m � L .21) t Q, c m m ur, m? O o 26 y C C U.1 a a o N r7f c wO C U m CDN c v a m ,aa a) M N =� a 3± m a m c r �Ch4) z m i N O �10 02.2 .= m 3 ❑ CL' -C a 0 N F- G in l W G U M p c y 4) m p U `a n C3 c ° rn n 4) W O qUj ^ o W rli w vi ti :3 C3 m CC � U) a 0 Q r C N U _ Z OI .N a 06 co ❑ N N ~ cuO o U N rA c a U m c o •y o •a, Co L O C LU a CD ui U to N En y 0 0 .- o - ai 'rr E E "❑ 0 U dES N C a O C N N N c cm L_ n > 3 E m c_ p m d u o a 3 2 O mL „Y i N O U O N 12 c co .O a m CL r- C O O c tm V La N d Q R C m O c a E c o?.o- m O' N o `- �' c CD E E N O O Op_ .a m ID Y c M m v c' m 8 'E Q. 'E N C C a 0-- D m 10 C= O EE c Cr E U p L a d O C m � L .21) t Q, c m m ur, m? O o 26 y C C a a o N r7f c wO C U m CDN c v a m ,aa a) M N =� a 3± m a m c r �Ch4) 3 m i N O �10 02.2 .= m 3 ❑ CL' -C a 0 N F- G in l Q G U M p c y 4) m p U `a n C3 c ° rn n 4) W O qUj ^ o W rli w vi ti :3 0- m CC � U) a 0 Q r C N U c m E a) m N N C (31 ca C va cis ❑ m d c U L 1: O CLa O U a) a) v c n .c a C 0 i CD ( 3 .0 O C Y C L CISm a a c c N N a 'D O O c iY (D N w O d 3 O CL m CL c 3La.. Q 0- '�+ 0- CC � U) a a ca C N ID C _ Z OI .N a 06 CD : ❑ N N ~ cuO o U N rA c a U m c o •y o •a, Co L O C LU a CD ui U to a O 'u O t3 U v 0 .C- CDOT Form 111176 Till Stormwater Management meld Inspection Report Instructions State waters are defined to be any and all surface and subsurface waters which are contained in or flow through the state, including, streams, rivers, lakes, drainage ditches, storm drains, ground water, and wetlands, but not including waters in sewage systems, waters in treatment works or disposal systems, waters in potable water distribution systems, and all water withdrawn for use until use and treatment have been completed. (Per subsection 107.25 and 25-8-103 (19) CRS) (3) Erosion Control Supervisor/SWMP Administrator: Indicate the name of the individual responsible for implementing, maintaining and revising the SWMP. (4) CDOT Project Engineer/Representative: Indicate the name of the CDOT representative performing the inspection with the ECS/SWMP Administrator. This person should be the Project Engineer or an authorized representative. (9) CDPS-SCP Certification #: Indicate the Colorado Discharge Permit System (CDPS) Stormwater Construction Permit (SCP) (for Stormwater Discharges Associated with Construction Activities) certification number, issued by CDPHE, for the project which the report is being completed. Certification number can be found on the first page of the SGP. (12) Reason(s) for inspection / Exclusion: Indicate the purpose for the inspection or exclusion. These inspections are required to comply with the CDOT Specifications and the CDPS-SCP. Routine Inspections. These inspections are required at least every 14 calendar days during active construction. Suspended projects require the 14 calendar day inspection unless snow cover exists over the entire site for an extended period of time, and melting conditions do not exist (see, Winter Conditions Inspections Exclusions). U Runoff Event Inspection for Active Sites. See page 1 for definition_ ❑ Third Party Request. Indicate the name of the third party requesting the inspection and, if known, the reason the request was made. ❑ Winter Conditions Inspections Exclusions. See page 1 for definition. An inspection does not need to be completed, but use this form to document the conditions that meet the Exclusion. ❑ Other. Specify any other reason(s) that resulted in the inspection. (13) SWMP Management: Review the SWMP records and documents and use a ✓ to answer the question. To comply with CDOT Standard Specifications and the CDPS-SCP, all of the items identified must be adhered to. If No is checked, document the reason and indicate the necessary corrective action in section 16 (Construction Site Assessment & Corrective Actions). If NA is checked, indicate why in the space provided or indicate in section 18 (General (Votes). (a) is the SWMP notebook located on site? A copy of the SWMP notebook must be retained on site, unless another location, specified by the permit, is approved by the Division. (b) Are changes to the SWMP documents noted and approved? Indicate all changes that have been made to any portion of ilia SWMP notebook documents during construction. Changes shall be dated and signed at the time of occurrence. Amendments may include items listed in subsection 208.03(c). (c) Are the inspection reports retained in the SWMP notebook? The ECS/Engineer shall keep a record of inspections. Inspection reports must identify any incidents of non-compliance with the terms and conditions of the CDOT specifications or the CDPS-SCP. Inspection records must be retained for three years from expiration or inactivation of permit coverage. (d) Are corrective actions from the last inspection completed? Have corrective actions from the last inspection been addressed? Is a description of the corrective action(s), the dale(s) of the corrective action(s), and the measure(s) taken to prevent future violations (including changes to the SWMP, as necessary) documented? (e) Is a Spill Prevention Control and Countermeasure (SPCC) Plan retained in the SWMP notebook? Subsection 208.06(c) requires that a SPCC plan be developed and implemented to establish operating procedures and that the necessary employee training be provided to minimize accidental releases of pollutants that can contaminate stormwater runoff. Records of spills, leaks or overflows that result in the discharge of pollutants must be documented and maintained_ Information that should be recorded for all occurrences include the time and date, weather conditions, reasons for spill, etc. Some spills may need to be reported to the Water Quality Control Division immediately. (f) Is a list of potential pollutants retained at the site? Subsection 107.25(b)6 requires the Erosion Control Supervisor to identify and describe all potential pollutant sources, including materials and activities, and evaluate them for the potential to contribute pollutants to stormwater discharge. (14) Current Construction Activities: Provide a short description of the current construction activities/phase at the project site; include summary of grading activities, installation of utilities, paving, excavation, landscaping, etc. - Estimate the acres of disturbed area at the lime of the inspection. Include clearing, grading, excavation activities, areas receiving overburden (e.g. stockpiles), demolition areas and areas with heavy equipment/vehicle traffic, installation of new ar improved haul roads and access roads, staging areas, borrow areas and storage that will disturb existing vegetative cover. (15) BMPs On Site at Time of Inspection: Indicate the BMPs that are installed on-site at the time of inspection. All BMP details (e.g., Standard Plan M-208-1) shall be included with the SWMP documents. page4 of 5 CDOT Form #1176 7x11 STATE OF COLORADO For Agency Use Only Permit Number Assigned COR03- Date Received 1 I Month Day Year COLORADO DISCHARGE PERMIT SYSTEM (CDPS) STORMWATER DISCHARGE ASSOCIATED WITH CONSTRUCTION ACTIVITIES APPLICATION PHOTO COPIES, FAXED COPIES, PDF COPIES OR EMAILS WILL NOT BE ACCEPTED. Please print or type. Original signatures are required. All items must be completed accurately and in their entirety for the application to be deemed complete. Incomplete applications will not be processed until all information is received which will ultimately delay the issuance of a permit. If more space is required to answer any question, please attach additional sheets to the application form. Applications must be submitted by mail or hand delivered to: Colorado Department of Public Health and Environment Water Quality Control Division 4300 Cherry Creek Drive South WQCD-P-B2 Denver, Colorado 80246-1530 Any additional information that you would like the Division to consider in developing the permit should be provided with the application. Examples include effluent data and/or modeling and planned pollutant removal strategies. PERMIT INFORMATION Reason for Application: ❑ NEW CERT ❑ RENEW CERT EXISTING CERT # Applicant is: ❑ Property Owner ❑ Contractor/Operator A. CONTACT INFORMATION - NOT ALL CONTACT TYPES MAY APPLY * indicates required *PERMITTEE (If more than one please add additional pages) *ORGANIZATION FORMAL NAME: 1) *PERMITTEE the person authorized to sign and certify the permit application. This person receives all permit correspondences and is legally responsible for compliance with the permit. Responsible Position (Title): Currently Held By (Person): Telephone No: email address Organization: Mailing Address: City: State: Zip: This form must be signed by the Permittee (listed in item 1) to be considered complete. Per Regulation 61 In all cases, it shall be signed as follows: a) In the case of corporations, by a responsible corporate officer. For the purposes of this section, the responsible corporate officer is responsible for the overall operation of the facility from which the discharge described in the application originates. b) In the case of a partnership, by a general partner. c) In the case of a sole proprietorship, by the proprietor. d) In the case of a municipal, state, or other public facility, by either a principal executive officer or ranking elected official page 1 of 5 revised April 2011 OV CO Dedicated to prolecling and improving the health and env'ronment of the people of Colorado Creek Dr S 4300 Cherry Denver, Colorado 80246-1530 Phone (303) 692.2000 eT6 TDD Line (303) 691.7700 Colorado Department Located in Glendale Colorado of I'ublic Ht.-alth httpJ1www.cdphe.state.co.us and lindronmcnt For Agency Use Only Permit Number Assigned COR03- Date Received 1 I Month Day Year COLORADO DISCHARGE PERMIT SYSTEM (CDPS) STORMWATER DISCHARGE ASSOCIATED WITH CONSTRUCTION ACTIVITIES APPLICATION PHOTO COPIES, FAXED COPIES, PDF COPIES OR EMAILS WILL NOT BE ACCEPTED. Please print or type. Original signatures are required. All items must be completed accurately and in their entirety for the application to be deemed complete. Incomplete applications will not be processed until all information is received which will ultimately delay the issuance of a permit. If more space is required to answer any question, please attach additional sheets to the application form. Applications must be submitted by mail or hand delivered to: Colorado Department of Public Health and Environment Water Quality Control Division 4300 Cherry Creek Drive South WQCD-P-B2 Denver, Colorado 80246-1530 Any additional information that you would like the Division to consider in developing the permit should be provided with the application. Examples include effluent data and/or modeling and planned pollutant removal strategies. PERMIT INFORMATION Reason for Application: ❑ NEW CERT ❑ RENEW CERT EXISTING CERT # Applicant is: ❑ Property Owner ❑ Contractor/Operator A. CONTACT INFORMATION - NOT ALL CONTACT TYPES MAY APPLY * indicates required *PERMITTEE (If more than one please add additional pages) *ORGANIZATION FORMAL NAME: 1) *PERMITTEE the person authorized to sign and certify the permit application. This person receives all permit correspondences and is legally responsible for compliance with the permit. Responsible Position (Title): Currently Held By (Person): Telephone No: email address Organization: Mailing Address: City: State: Zip: This form must be signed by the Permittee (listed in item 1) to be considered complete. Per Regulation 61 In all cases, it shall be signed as follows: a) In the case of corporations, by a responsible corporate officer. For the purposes of this section, the responsible corporate officer is responsible for the overall operation of the facility from which the discharge described in the application originates. b) In the case of a partnership, by a general partner. c) In the case of a sole proprietorship, by the proprietor. d) In the case of a municipal, state, or other public facility, by either a principal executive officer or ranking elected official page 1 of 5 revised April 2011 2) DMR COGNIZANT OFFICIAL (i.e. authorized agent) the person or position authorized to sign and certify reports required by the Division including Discharge Monitoring Reports *DMR's, Annual Reports, Compliance Schedule submittals, and other information requested by the Division. The Division will transmit pre-printed reports (ie. DMR's) to this person. If more than one, please add additional pages. Same As 1) Permittee ❑ Responsible Position (Title): Currently Held By (Person): Telephone No: email address Organization: Mailing Address: City: State: Zip: Per Regulation 61: All reports required by permits, and other information requested by the Division shall be signed by the permittee or by a duly authorized representative of that person. A person is a duly authorized representative only if: (i) The authorization is made in writing by the permittee (ii) The authorization specifies either an individual or a position having responsibility for the overall operation of the regulated facility or activity such as the position of plant manager, operator of a well or a well field, superintendent, position of equivalent responsibility, or an individual or position having overall responsibility for environmental matters for the company. (A duly authorized representative may thus be either a named individual or any individual occupying a named position); and (iii) The written authorization is submitted to the Division 3) *SITE CONTACT local contact for questions relating to the facility & discharge authorized by this permit for the facility. ❑ Same As 1) Permittee Responsible Position (Title): Currently Held By (Person): Telephone No: email address Organization: _ Mailing Address: City: State: Zip: 4) * BILLING CONTACT if different than the permittee Responsible Position (Title): Currently Held By (Person): Telephone No: email address Organization: Mailing Address: City: State: Zip: Page 2 of 5 revised April 2011 5) OTHER CONTACT TYPES (check below) Add pages if necessary: ResponsiblePosition (Title): Currently Held By (Person): Telephone No: email address Organization: Mailing Address: City; State: Zip: o Pretreatment Inspection Facility Contact Stormwater MS4 Responsible Coordinator Consultant Person o Environmental Contact Compliance Contact Stormwater Authorized a Biosolids Responsible Representative Party Other a Property Owner B. Permitted Project/Facility Information Project/Facility Name Street Address or cross streets (e.g., "S. of Park St. between 5th Ave. and 10"' Ave.", or "W. side of C.R. 21, 3.25 miles N. of Hwy 10"; A street name without an address, intersection, mile marker, or other identifying information describing the location of the project is not adequate. For linear projects, the route of the project should be described as best as possible with the location more accurately indicated by a map.) City, Zip Code County Facility Latitude/Longitude— (approximate center of site to nearest 15 seconds using one of following formats 001A Latitude Longitude (e.g., 39.703°, 104.933"') degrees (to 3 decimal places) degrees (to 3 decimal places) or 001A Latitude ° Longitude ° " (e.g., 39°46'11"N, 104°53'1 VW) degrees minutes seconds degrees minutes seconds For the approximate center point of the property, to the nearest 15 seconds. The latitude and longitude must be provided as either degrees, minutes, and seconds, or in decimal degrees with three decimal places. This information may be obtained from a variety of sources, including: Surveyors or engineers for the project should have, or be able to calculate, this information. EPA maintains a web -based siting tool as part of their Toxic Release Inventory program that uses interactive maps and aerial photography to help users get latitude and longitude. The siting tool can be accessed at www.epa.gov/tri/report/siting_tool/index.htm ,; U.S. Geological Survey topographical map(s), available at area map stores. Using a Global Positioning System (GPS) unit to obtain a direct reading. Note., the latitude/longitude required above is not the directional degrees, minutes, and seconds provided on a site legal description to define property boundaries. C. MAP (Affachmentl If no map is submitted the permit will not be issued. Map: Attach a map that indicates the site location and that CLEARLY shows the boundaries of the area that will be disturbed. Maps must be no larger than 11x17 inches. D. LEGAL DESCRIPTION Legal description: If subdivided, provide the legal description below, or indicate that it is not applicable (do not supply Township/Range/Section or metes and bounds description of site) Subdivision(s): Lot(s): OR Not applicable (site has not been subdivided) page 3 of 5 revised April 2011 Block(s): E. AREA OF CONSTRUCTION SITE Total area of project site (acres): Area of project site to undergo disturbance (acres): Note: aside from clearing, grading and excavation activities, disturbed areas also include areas receiving overburden (e.g., stockpiles), demolition areas, and areas with heavy equipment/vehicle traffic and storage that disturb existing vegetative cover Total disturbed area of Larger Common Plan of Development or Sale, if applicable: (i.e., total, including all phases, filings, lots, and infrastructure not covered by this application) Provide both the total area of the construction site, and the area that will undergo disturbance, in acres. Note: aside from clearing, grading and excavation activities, disturbed areas also include areas receiving overburden (e.g., stockpiles), demolition areas, and areas with heavy equipment/vehicle traffic and storage that disturb existing vegetative cover (see construction activity description under the APPLICABILITY section on page 1). If the project is part of a larger common plan of development or sale (see the definition under the APPLICABILITY section on page 1), the disturbed area of the total plan must also be included. F. NATURE OF CONSTRUCTION ACTIVITY Check the appropriate box(s) or provide a brief description that indicates the general nature of the construction activities. (The full description of activities must be included in the Stormwater Management Plan.) Single Family Residential Development Multi -Family Residential Development Commercial Development Oil and Gas Production and/or Exploration (including pad sites and associated infrastructure) Highway/Road Development (not including roadways associated with commercial or residential development) Other — Description: G. ANTICIPATED CONSTRUCTION SCHEDULE Construction Start Date: Final Stabilization Date: •Construction Start Date -This is the day you expect to begin ground disturbing activities, including grubbing, stockpiling, excavating, demolition, and grading activities. •Final Stabilization Date - in terms of permit coverage, this is when the site is finally stabilized. This means that all ground surface disturbing activities at the site have been completed, and all disturbed areas have been either built on, paved, or a uniform vegetative cover has been established with an individual plant density of at least 70 percent of pre -disturbance levels. Permit coverage must be maintained until the site is finally stabilized. Even if you are only doing one part of the project, the estimated final stabilization date must be for the overall project. If permit coverage is still required once your part is completed, the permit certification may be transferred or reassigned to a new responsible entity(s). H. RECEIVING WATERS (If discharge is to a ditch or storm sewer, include the name of the ultimate receiving waters) Immediate Receiving Water(s): Ultimate Receiving Water(s): Identify the receiving water of the stormwater from your site. Receiving waters are any waters of the State of Colorado. This includes all water courses, even if they are usually dry. If stormwater from the construction site enters a ditch or storm sewer system, identify that system and indicate the ultimate receiving water for the ditch or storm sewer. Note: a stormwater discharge permit does not allow a discharge into a ditch or storm sewer system without the approval of the owner/operator of that system. page 4 of 5 revised April 2011 I. REQUIRED SIGNATURES (Both parts i. and ii. must be signed) Signature of Applicant: The applicant must be either the owner and/or operator of the construction site. Refer to Part B of the instructions for additional information. The application must be sinned by the applicant to be considered complete. In all casesit shall be signed as follows: (Regulation 61.4 (lei) a) In the case of corporations, by the responsible corporate officer is responsible for the overall operation of the facility from which the discharge described in the form originates b) In the case of a partnership, by a general partner. c) In the case of a sole proprietorship, by the proprietor. di In the case of a municipal, state, or other public facility, by either a principal executive officer, ranking elected official, (a principal executive officer has responsibility for the overall operation of the facility from which the discharge originates). STOP!: A Stormwater Management Plan must be com leted Prior to signing the following certifications! i. STORMWATER MANAGEMENT PLAN CERTIFICATION "I certify under penalty of law that a complete Stormwater Management Plan, has been prepared for my activity. Based an my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the Stormwater Management Plan is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for falsely certifying the completion of said SWMP, including the possibility of fine and imprisonment for knowing violations." XX Signature of Legally Responsible Person or Authorized Agent (submission must include original signature) Date Signed Name (printed) Title ii. SIGNATURE OF PERMIT LEGAL CONTACT "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." "I understand that submittal of this application is for coverage under the State of Colorado General Permit for Stormwater Discharges Associated with Construction Activity for the entirety of the construction site/project described and applied for, until such time as the application is amended or the certification Is transferred, inactivated, or expired." XX Signature of Legally Responsible Person )submission must include original signature) Date Signed Name (printed Title DO NOT INCLUDE A COPY OF THE STORMWATER MANAGEMENT PLAN DO NOT INCLUDE PAYMENT— AN INVOICE WILL BE SENT AFTER THE CERTIFICATION IS ISSUED. page 5 of 5 revised April 2011