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HomeMy WebLinkAbout1.16 SWMPUNITED COMPANIES IIFUIf11 COMPANIES CERISE GRAVEL PIT STORMWATER MANAGEMENT PLAN In Conformance with the Guidelines set by: Colorado Department of Public Health and Environment Water Quality Control Division Prepared for: Oldcastle SW Group, Inc. dba United Companies 2273 River Rd Grand Junction, CO 81505 (970) 243-4900 Date: April 2014 X, Greg Lewicki And Associates 11541 Warrington Court Phone: (303) 346-5196 Fax (303)-346-6934 Parker, CO USA 80138 E -Mail: infoCitlewicki..biz Stormwater Management Plan Cerise Gravel Pit April 2014 Facility Name: Facility Type: STORMWATER MANAGEMENT PLAN (SWMP) Cerise Gravel Pit Sand and Gravel Processing Date Initial Operations Started: Not yet started Facility Mailing Address: Facility Location Address: United Companies 2273 River Rd Grand Junction, CO 81505 (970) 243-4900 Cerise Gravel Pit 86 County Road 104 Carbondale, CO 81623 This plan was prepared using sound engineering practices by Greg Lewicki, PE of Greg Lewicki and Associates on April 2014. Greg Lewicki and Associates is located at 11541 Warrington Court in Parker, Colorado 80138. Phone: (303)-346-5196. Permittee Certifying Statement: 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 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. Name: Pete Siegmund Company: Oldcastle SW Group, Inc. dba United Companies Position: Vice President — Oldcastle SW Group, Inc. Signature: Date: Page 1 Stormwater Management Plan Cerise Gravel Pit April 2014 INTRODUCTION This Stormwater Management Plan is prepared to mitigate potential impacts to Waters of the U.S. (Crystal Creek) resulting from the operations at the Cerise Gravel Pit by United Companies in Garfield County, Colorado. Water quality, drainage, monitoring and pollution control are addressed in this Plan. Adherence to this plan will allow United Companies to contain potential pollutants on the site and have a plan of action for minimizing the risk of contaminating surface waters. This Plan includes stormwater, and process water. The disturbed areas that are under the control of this SWMP consist of the mining and processing area along with the office and truck scale. KEY ELEMENTS OF THIS PLAN • Process Water (water used for gravel washing, dust control, and water that encounters disturbed areas.) shall be contained within the pit and allowed to evaporate. • All disturbed areas will drain to the active mining and processing areas. See the SWMP Map for the flow directions from particular portions of the site. • Stormwater from rainfall or snowmelt will inadvertently mix with process water or becomes process water if it flows across the disturbed area and shall be contained within the pit. From here it will evaporate or infiltrate. • Any discharge of Process Water to surface waters or to groundwater will be regulated through the Water Quality Control Division for discharges associated with sand and gravel production operations for stormwater and process water. If required, United Companies will obtain a Discharge Permit to allow discharge of Process Water from the pit. • Any discharge of Process Water from the site shall be sampled and tested for pH, Total Dissolved Solids, and Total Suspended Solids. The person sampling the discharge shall evaluate the flow rate and look for the presence of any oils (oily sheen). • The only acceptable methods of managing on-site stormwater runoff are to contain it for Use in Operations, for Infiltration into the ground, for Evaporation into the air, or Discharge to the Creek. • Sediment is classified by the State as a potential pollutant, which can negatively affect the quality of stormwater discharges. Loose sediment from mining, removal of topsoil, gravel washing, etc. will be contained on-site completely and not be allowed to be carried off-site by stormwater. Erosion control methods such as revegetation or paving will be implemented on the site to control sediment migration during stormwater runoff events. • The best method of managing site runoff water quality is to remove and properly dispose of any site contaminants that could be transported by stormwater runoff. All activities that could produce pollutants will be restricted to specific areas or have secondary containment. The designated area for this site is in the mining and processing area in the pit. See the SWMP Map for the location of this area. Drips, leaks and spills will be cleaned up regularly. More detail on these items is provided later in this Plan. Page 2 Stormwater Management Plan Cerise Gravel Pit April 2014 I. INDUSTRIAL ACTIVITY DESCRIPTION A. GENERAL PROJECT NAME AND LOCATION Cerise Gravel Pit 86 County Road 104 Carbondale, CO 81623 The Cerise Gravel Pit is a sand and gravel operation located on the east side of Carbondale, Colorado along Colorado State Highway 82 as shown in the — General Location Map. United Companies is the sole operator of the pit and is the responsible party for this SWMP Plan. The property is located in Sections 25 & 26, Township 8 South, Range 88 West, 6th P.M Page 3 Stormwater Management Plan Cerise Gravel Pit April 2014 Cerise Gravel Pit Carbondale, CO Figure 1 - General Location Map Page 4 Stormwater Management Plan Cerise Gravel Pit April 2014 OPERATOR & OWNER NAME AND ADDRESS The Cerise Gravel Pit is operated by United Companies. The Owner is Operator Owner United Companies Clifford Cerise Ranch Co. LLLP 2273 River Rd. 86 CR 104 Grand Junction, Colorado 81502 Carbondale, CO 81623 (970) 243 - 4900 SITE DESCRIPTION The Cerise Gravel Pit is a sand and gravel processing operation located northeast of Carbondale, Colorado along CO Highway 82, as shown on the - General Location Map. The site is bordered by private property to the north and east, the highway to the south, and Crystal Creek to the west. The Cerise Gravel Pit area is approximately 65.48 acres in total permitted area. No more than 31.4 acres of disturbance will be allowed at any one time. See SWMP Map in Appendix D. The site is a gravel deposit west of Crystal Creek. The water table is an undetermined depth below the surface. Groundwater was not encountered in drilling that extended over 70 feet below the surface. Gravel will be mined on site and is processed into road base, and aggregate supply for asphalt and concrete manufactured off site. Asphalt and concrete are not produced on site. None of the site falls within any 100 -year floodplain. Stormwater that falls on the mining and processing areas will be contained with the mine pit, and allowed to infiltrate or evaporate. The remainder of the site will consist of vegetated berms, vegetated reclaimed areas, and vegetated undisturbed areas. Process water will only be used on disturbed ground, which drains to the mine pit. Page 5 Stormwater Management Plan Cerise Gravel Pit April 2014 B. STANDARD INDUSTRIAL CLASSIFICATION (SIC) CODES SIC CODE INDUSTRY DESCRIPTION 1442 Processing of Sand & Gravel C. DESCRIPTION OF OPERATIONS United Companies will conduct gravel processing operations under a Division of Mining, Reclamation and Safety Permit on the site known as the Cerise Gravel Pit. United Companies will be permitted for the following uses on the property: • Mining, crushing, screening/washing, and stockpiling of aggregate; • Fuel and Chemical Storage • Truck loading and truck travel in and out of the site A crush/screen plant, wash plant, various material stockpiles, office trailer, and fuel storage are located on the Cerise Gravel Pit site. Fuel tanks that are part of the portable plants (crush/screen, wash plant, etc,) that are brought into the site will be present in the processing area. All areas where fuel is stored are well outside of the 100 year flood plain. Portable tanks on each piece of portable equipment will have secondary containment as appropriate. The portable plants will have their own SPCC plans. Brief descriptions of these operations are provided below: MINING OF THE PIT The gravel is an anticipated 100' thick dry terrace deposit. It will be mined in a sequence starting in the southwest corner of the property, then north, then east, then south, and finally a final phase in the south central portion of the site. Given the depth of the deposit, the gravel will be mined at a 1H:1V slope in 25 foot intervals interrupted by 20 foot benches OR mined as a continuous 3H:1 V slope from top to bottom. SAND AND GRAVEL PROCESSING Sand and gravel processing will consist of crushing mined raw gravel in the crush/screen plant. Gravel is then screened and washed in the wash plant, then stockpiled for feed for transport off site. Some gravel may be sold unwashed to make other products such as road base. FUEL STORAGE There will be fuel storage located at the Cerise Gravel Pit for portable plants. The fuel storage tanks will be attached to the portable plants themselves and will have built in secondary containment of 110 % of the tank capacity in each case. Each of these portable plants will have their own SPCC Plans that are associated with the plants, wherever they go. CHEMICAL STORAGE There may be a number of additional tanks holding chemicals on site. These chemicals are described below: Add as needed Page 6 Stormwater Management Plan Cerise Gravel Pit April 2014 D. BASIN DESCRIPTIONS FOR AREAS OF INDUSTRIAL ACTIVITY DRAINAGE BASINS OFFSITE SOURCES The primary off site source of runoff will be the area of slope directly northeast of the permit. Also, runoff is anticipated to come from portions of the west side of the industrial park to the east of the site. ON-SITE STORMWATER AND PROCESS WATER RUNOFF All on site stormwater that passes though the mining and processing area and all process water will be drained into the mine pit, where it will be allowed to infiltrate or evaporate. There is no plan for a water discharge at the Cerise Gravel Pit. Stormwater Calculations Stormwater calculations for storage capacity are based on a larger drainage area and the 100 -YR 24 -HR storm event at the site. Typical operations at Cerise will involve handling significantly less water from smaller drainage areas. This is a worst case demonstration. Runoff Curve Numbers (CN) for Watershed Area Description Hydrologic Soil Group Area (acres) CN Disturbed Land Pasture Grassland Range (Fair) Weighted CN Group A Soils: Group B Soils: Group C Soils: Group D Soils: Group C Soils Group C Soils 54.36 4.22 58.59 87 79 86.4 Hydrologic Soil Group High infiltration (low runoff). Sand, loamy sand, or sandy loam. Infiltration rate > 0.3 inch/hr when wet. Moderate infiltration (moderate runoff). Silt loam or loam. Infiltration rate 0.15 to 0.3 inch/hr when wet. Low infiltration (moderate to high runoff). Sandy clay loam. Infiltration rate 0.05 to 0.15 inch/hr when wet. Very low infiltration (high runoff). Clay loam, silty clay loam, sandy clay, silty clay, or clay. Infiltration rate 0 to 0.05 inch/hr when wet. Page 7 Stormwater Management Plan Cerise Gravel Pit April 2014 The storage volume to prevent discharge is calculated as the volume of the main pit above the water table. Runoff Curve Number and Runoff Project: SWMP Areas By: B Langenfeld Date: 04/16/14 Location: Cerise Gravel Pit 1. Runoff Curve Number (CN) Cover description CN Soil Group Area(Acre) Mined Land, Disturbed (Poor) 87 C 54.364 Pasture Grassland Range (Fair) 79 C 4.223 CN (weighted): 86.4 Total Area: 58.587 Acre 2. Runoff Return Period: 100 -Year Rainfall, P: 3.52 in Runoff, Q: 2.1515 in Runoff Volume: 10.5042 Acre -Ft The available storage volume in the mine pit is over 1700 ac -ft, much more than needed to contain any stormwater runoff from the site. E. SUMMARY OF EXISTING DISCHARGE SAMPLING DATA The Cerise Gravel Pit will not discharge, and has not in the past. F. DESCRIPTION OF PROPOSED SAMPLING POINTS The Cerise Gravel Pit will not discharge and therefore there are not sample points needed. Page 8 Stormwater Management Plan Cerise Gravel Pit April 2014 11. STORMWATER MANAGEMENT CONTROLS A. SWMP ADMINISTRATOR The SWMP Administrator is responsible for the daily Stormwater Management Plan (SWMP) administration at this site. SWMP Administrator: Jason Burkey Phone Number: (970) 243-4900 Page 9 Stormwater Management Plan Cerise Gravel Pit April 2014 B. RISK IDENTIFICATION AND ASSESSMENT It is anticipated that no stormwater discharges will occur for any stormwater events prior to being allowed to settle in the setting pond. A summary of estimated risks if a discharge were to occur is presented below: Potential for Discharge from Basin: Pollutant A B Oil and Grease Low Low Total Dissolved Solids Low Low Total Suspended Solids Low Low pH (Outside Range 6.5 to 9.0) Low Low Identification of Potential Pollutant Sources 1. Disturbed and Stored Soils — As shown on the SWMP Map, topsoil and overburden piles are stored on site. All disturbed areas drain to the mine pit where the water will either evaporate or infiltrate. 2. Vehicle Tracking of Sediment — As shown on the SWMP Map, the entrance to the pit is paved. All internal haul roads will be graveled. Unpaved roadways will be watered regularly for dust control, which should reduce sediment tracking. 3. Management of Contaminated Soils — The site has no contaminated soils. There are no waste asphalt and concrete piles on site. If a spill occurs, any contaminated soils will be isolated from away from any possible off site discharge. These materials will be treated or hauled off site. 4. Loading and Unloading Operations — Washed and screened gravels are sold from stockpiles located on site. All loading and unloading operations will take place within the mining and processing areas. 5. Outdoor Storage Activities (Storage of Chemicals) — Fuel is stored in both the portable tanks on the portable equipment. Other chemicals may be stored on site, as previously outlined but these will have containment from the pit itself and the site berms. Without BMP's there is a slight potential to discharge pollutant laden water but the BMP's outlined in this Plan make polluted discharges a remote possibility from this source. The primary BMP's are the secondary containment of the tanks and the site berms. 6. Vehicle and Equipment Maintenance and Fueling — There are no diesel tanks or used oil tanks on site which are not part of the portable plants. No significant maintenance will occur on this site except normal routine maintenance. Without BMP's there is a slight potential to discharge pollutant laden water but the BMP's outlined in this Plan make polluted laden discharges a remote possibility from this source. The primary BMP's are a) the secondary containment of the tanks, b) containment of the areas on site where the fueling and maintenance occurs. 7. Significant Dust or Particle Generating Processes —The mining, crushing or screening activities will primarily occur with raw material within the mine pit. Watering will be conducted as needed to minimize Page 10 Stormwater Management Plan Cerise Gravel Pit April 2014 dust generation. Due to the drainage patterns, none of the runoff from dust suppression will be able to discharge from the site, it will all either evaporate or infiltrate. 8. Routine Maintenance Activities involving Fertilizers, Pesticides, Detergents, Fuels, Solvents, Oils, etc. — The dispensing of fuels from the various diesel tanks are discussed above. There is no shop area on site, and no fertilizers, detergents, pesticides or solvents are planned to be used on site. Without BMP's there is a slight potential to discharge pollutant laden water but the BMP's outlined in this Plan make polluted laden discharges a remote possibility from this source. The primary BMP's are the secondary containment of the tanks, containment of the areas on site where the fueling and maintenance occurs. 9. On Site Waste Management Practices — The small office trailer may have small garbage bins, which are picked up by the local waste management company and disposed of in approved landfills. Pickup may occur weekly during periods of high activity on the site. One containers will be fully sealed and less than 50 gallons in size. Without BMP's there is a slight potential to discharge pollutant laden water but the BMP's outlined in this Plan make polluted laden discharges a remote possibility from this source. The primary BMP's are the integrity of the waste bins and the pickup of the waste by the approved waste management company serving the area. 10. Non Industrial Waste Sources such as Worker Trash and Portable Toilets — Porta potties will exist on site at the office trailer, which are serviced as needed by the local contractor. Worker trash is disposed of in the waste bins, which are also taken to the approved landfill by the local waste management company. Without BMP's there is a slight potential to discharge pollutant laden water but the BMP's outlined in this Plan make polluted laden discharges a remote possibility from this source. The primary BMP's are the factory supplied waste trash bins with the proper disposal of the trash and the porta potty waste. 11. Other Areas or Procedures Where Potential Spills Can Occur — Other than the tanks identified in this Plan there are no other tanks or other sources which could result in a spill other than a rupture of hydraulic lines and diesel tanks associated with the mobile equipment on site, which are a loader and dozer. Without BMP's there is a slight potential to discharge pollutant laden water but the BMP's outlined in this Plan make polluted laden discharges a remote possibility from this source. The primary BMP's are a) the fact that the quantities on the mobile equipment are small, less than 120 gallons of diesel fuel and 60 gallons of oil, b) the SPCC Plan for the portable plants requires spill kits which will be used to mop up any spill with the mobile equipment, and c) the ability to shut the pit pump off until any mobile equipment spill is cleaned up. Page 11 Stormwater Management Plan Cerise Gravel Pit April 2014 C. PREVENTATIVE MAINTENANCE These are the inspection and maintenance practices that will be implemented to control stormwater runoff quality: • The SWMP Administrator will be responsible for inspections, maintenance and oversight of any required repair operations. SWMP inspections will occur quarterly and records of these inspections will be kept on file on site with the SWMP Plan. • Ground slopes will be minimized to limit erosion and slow down flow during a stormwater event. • Final backfilled disturbed areas and stockpiles will be reseeded when practical to minimize erosion and sediment transport. • Inspect all tanks for leaks, proper dispensing equipment and adequate secondary containment. • Inspect and clean out setting pond as required to maintain settling volume. • Inspect all Isolation berms on site for disruption, erosion or any other fault that requires maintenance. • Proper operation of the crushing/screen plant and the site activities are covered under the plants and site air emissions permits which have been approved for all site plants and activities. Page 12 Stormwater Management Plan Cerise Gravel Pit April 2014 D. GOOD HOUSEKEEPING The following good housekeeping practices will be employed at the site: • Substances stored on-site will be stored in a neat, orderly manner in their appropriate containers. • Open containers of non -hazardous materials shall be stored under a roof or other enclosure to prevent mixing with stormwater. • The Environmental Department and site operators are responsible for day-to-day site operations and directing spill prevention, cleanup, and reporting. • If drip pans are used, they will be cleaned on a regular basis and not allowed to fill with stormwater, and the contents disposed in a landfill approved to handle such waste. • Hazardous materials will be stored in accordance with the Uniform Fire Code, and placards will be visible to identify the potential hazards. The classification of any material stored on-site shall be made by the fire department. E. BEST MANAGEMENT PRACTICES This Stormwater Management Plan was developed to improve the water quality of stormwater runoff. The Best Management Practices (BMP's) are intended to provide erosion control measures to avoid high sediment load transport into receiving streams. The BMPs are also intended to avoid transport of on-site contaminants into waterways. Implementation of the BMPs will improve water quality in discharges from this industrial site. BMP'S FOR THE SITE ARE: A. All Stormwater encountered within the disturbed areas will be drained to the pit where significant settling time is provided. B. The volume of the pits completely captures the 100 -YR event volume of runoff. C. Non -paved roads are well compacted and covered with aggregate road base. D. The access road is paved to the site and will reduce mud and dirt tracking to the public road system. F. EMPLOYEE TRAINING United Companies, through the Environmental Coordinator, will train and educate current and new employees on appropriate stormwater management, spill response, good housekeeping and materials storage practices. Best management practice training programs should also be conducted regarding improving the water quality of stormwater runoff. G. TESTING FOR NON-STORMWATER DISCHARGES Page 13 Stormwater Management Plan Cerise Gravel Pit April 2014 The only non-stormwater discharges expected at this site are pit dewatering and process water. Therefore, no testing for illicit connections or other non-stormwater discharges is proposed. H. AMENDMENTS This SWMP plan must be amended whenever there is a change in facility design, construction, operation, or maintenance that materially affects United Companies potential for discharge of pollutants (sediment, oils, etc.) into or upon waters of the United States. Such amendments must be implemented not later than six months after the change occurs. At least once every three years, United Companies will complete a review and evaluation of their SWMP Plan. Any major amendments to the SWMP plan will be certified by a Registered Professional Engineer. Minor amendments will be made by the operator. Page 14 Stormwater Management Plan Cerise Gravel Pit April 2014 1. FINAL SITE STABILIZATION As required in the Colorado Division of, Reclamation, Mining and Safety permit, the site will be reclaimed to the approved post mine land use of irrigated fields. The reclamation permit will ensure that the permanent site is stable and will have adequate vegetation. The remaining excavation will result in the site delivering less sediment to the River than that of the pre -mine rangeland site. III. COMPREHENSIVE INSPECTION The SWMP Administrator will conduct regular inspections of the site for stormwater management controls, spill control, maintenance, and cleanup. Inspections during at least the Spring and Fall of each year shall be conducted and the records of such inspections shall be maintained in files at the site together with the SWMP Plan. The inspections shall incorporate a complete review of all BMP's outlined in this plan and will report on any BMP's which are not functioning and/or require maintenance. Any discharges which are out of compliance with the Discharge permit shall also be reported with corrective actions outlined. IV. RECORD KEEPING AND INTERNAL REPORTING PROCEDURE Incidents such as spills or other discharges, together with other relevant information describing the quality/quantity of stormwater will be included in records maintained at the site. Inspection records and maintenance records will be maintained at the site. At least two comprehensive Stormwater Management Plan inspections (Spring and Fall) will be conducted each year for annual reporting to the Colorado Department of Public Health and Environment. The reports shall include the date of the inspection, findings and actions taken, and submitted with the Annual Stormwater Report due February 15 each year. V. CONSISTENCY WITH OTHER PLANS A separate site SPCC Plan, if required, will be continually updated as needed for this site in accordance with Section 311 of the Clean Water Act. If other permits affecting stormwater are required of the site in the future, the SWMP will be modified to ensure consistency. These plans will also maintain consistency with the County and DRMS permits. VI. ALLOWABLE NON-STORMWATER DISCHARGES There will be no non-stormwater discharges from this site. 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