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HomeMy WebLinkAbout1.05 Errosion Control-Traffic StudyErosion & Sediment Control Plan ■ HUNTER RIDGE ENERGY SERVICES LLC OLSSON ASSOCIATES March 5, 2013 Chris Putnam Encana OiI and Gas (USA) Inc. 143 Diamond Avenue Parachute, CO 81635 Re: Garfield County Erosion and Sediment Control Plan Hunter Ridge Energy Services LLC 003 Story Booster Site Dear Mr. Putnam: Olsson Associates (Olsson) has conducted a review of the existing conditions for the preparation of the Erosion and Sediment Control Plan, The site was previously designed and constructed per Colorado OiI and Gas Conservation Commission (COGCC) standards. The use of the site is currently a booster compressor station, which will not change. A review of the existing conditions for erosion and sediment control appear to be consistent with similar sites. Best Management Practices (BMPs) utilized on the site include berms, diversion ditches, and vegetation. Additional BMPs are not necessary for the site. This can be seen on the attached exhibit. It is anticipated that the existing drainage patterns will be maintained. The site is nearby a perennial drainage. Additional grading is not anticipated with the project. Erosion and Sediment Control Plan a. Site Map: The proposed site will not differ from the existing site. The existing site features are identified within the attached exhibit. b. Drainage Structures: Additional design is not anticipated since the proposed and existing site will not differ. Additional disturbance is not anticipated. c. Topography: The attached exhibit illustrates the existing topography of the site. Additional grading is not anticipated. d. Grading Plan: The existing topography is anticipated to remain undisturbed. e. Soil Stockpile and Snow Storage Areas: Soil stockpiles and snow storage is not anticipated to differ from the existing use. f. Drainage Plan: The existing drainage patterns are not anticipated to be modified. g. Equipment Storage Areas: Equipment storage is not anticipated to differ from the existing use. h. Temporary Roads: Temporary roads are not anticipated with the development. The existing infrastructure is expected to serve the site. 760 Horizon Drive, Suite 102 TEL 970.263.7800 Grand Junction, CO 81506 FAX 970.263.7456 www.oaconsulting.com i. Areas of Steep Slope: The existing side slopes surrounding the site are steeper than 20% and are expected to remain undisturbed. j. Construction Schedule: A construction schedule is not anticipated since the site currently exists. k. Permanent Stabilization: The site is currently in interim reclamation, but has yet to reach 75% stabilization. I. Erosion Control Measures: Erosion control measures are expected to remain in place and monitored. m. Estimated Cost: No construction costs are anticipated since this is an existing site. n. Calculations: Drainage design is not included since there are no anticipated changes to drainage patterns. o. Description of Neighboring Areas: The site is surrounded by oil and gas activity. p. Description of Stormwater Management Plan Concept: The previously prepared stormwater management plan shall be followed. However, no additional disturbance is anticipated. q. Hydrologic and Hydraulic Calculations: Drainage design is not included since there are no anticipated changes to the site. r. Maintenance Requirements: The site shall be inspected and maintained in accordance with the previously prepared stormwater management plan. s. Copy of Stormwater Management Plan application: Not applicable. t. Additional Information: None. u. Signature Block: See below. Additional construction is not anticipated, therefore, the previously stabilized areas are not anticipated to be disturbed. If you should have any questions regarding the site observations or the documents provided please let me know. Sincerely, t)ic `,54) Wyatt E. Popp, PE Olsson Associates Senior Project Engineer 760 Horizon Drive, Suite 102 TEL 970.263.7800 Grand Junction, CO 81506 FAX 970.263.7456 www.oaconsulting.com o0 0 (:) m E xl oo a wN (n X OczI LE LP 0 w CY)X N N CO co O L.0I 0) 5 w u o QN O 13O U � h Q o o / / / 0 //// /////� // /// / / 4s / OPe / PIPELINE WARNING SIGNS 1� Co. — F (STING DIS BANCE ( G DIS y(JRBANGE (TYP EXIS ING SLOPE ERC PTO BARRICADE (TYP) o 8®a � SCAN Oq METHANOL0 EXISTING TOPSOIL BERM ve / WELLHEAD WF15D 4042- OO WELLHEAD WFI OD WELLHEAD WF11D TANK O O WELLHEAD (CAPPED) *WELLHEAD (CAPPED) SLOPE TQ BE PROTECTE EXISTING PIPEUNE (TYP) BOLLARD. PROJEC /o e° opo/ UNDARY SOLAR PANEL TANK COMM. A TOWER VALVE VAULT /41 Q PIPEUNE61' / / 7 WARNING SIGN 2 ,b\4) 55 do ,\0 00 90 00 ,d / /� /� /9° / /0° CAN 2/7/ g88"04'40j 438.21' nt of Beginning o/ h0 jm° j�o 9o. IN/ `b°ry° <a° ct,C, EXISTIN SLOP INT CEP OR DITCHE 1 = 80' 0' 40' 80' 160' SCALE IN FEET NOTES. 1. BMPs SHOWN ARE APPROXIMATE AND SHALL BE ADJUSTED APPROPRIATELY TO FIELD CONDITIONS. 2. REFER TO STORM WATER MANAGEMENT PLAN FOR INFORMATION RELATED TO BMS DETAILS. 3. SITE DISTURBANCES SHALL BE STABILIZED WITH ROCK OR SEED PER THE STORMWATER AMANGEMENT PLAN. 4. BACKGROUND INFORMATION PROVIDED BY: WASATCH SURVEYING, DATED 12/5/12. � O 0 0 .N O 0 0 r` O U T. 0 NOTE THIS DOCUMENT HAS BEEN RELEASED BY OLSSON ASSOCIATES ONLY FOR REVIEW BY REGULATORY AGENCIES AND OTHER PROFESSIONALS, AND IS SUBJECT TO CHANGE. THIS DOCUMENT IS NOT TO BE USED FOR CONSTRUCTION. OLSSON ASSOCIATES ASSUMES NO RESPONSIBILITY FOR EXISTING UTILITY LOCATIONS (HORIZONTAL OR VERTICAL). THE EXISTING UTILITIES SHOWN ON THIS DRAWING HAVE BEEN PLOTTED FROM THE BEST AVAILABLE INFORMATION. IT IS HOWEVER THE RESPONSIBILITY OF THE CONTRACTOR TO FIELD VERIFY THE LOCATION OF ALL UTILITIES PRIOR TO THE COMMENCEMENT OF ANY CONSTRUCTION ACTIVITIES. CALL 811 SEVENTY-TWO HOURS PRIOR TO DIGGING, GRADING OR EXCAVATING FOR THE MARKING OF UNDERGROUND MEMBER UTILITIES EROSION AND SEDIMENT CONTROL EXHIBIT HUNTER RIDGE ENERGY SERVICES LLC 003 596 STORY BOOSTER SITE GARFIELD COUNTY, COLORADO drawn by: checked by: approved by: project no.: dwg name: date: SDS WEP WEP 012-2798 122798 ER1 03.05.200013 FIGURE 1 OF 1 Traffic Study ■ HUNTER RIDGE ENERGY SERVICES LLC BASIC TRAFFIC ANALYSIS HUNTER RIDGE ENERGY SEVICES, LLC 003 596 FACILITY GARFIELD COUNTY, COLORADO ON,OLSSON ASSOCIATES January 2013 826 21 1/2 Road !Grand Junction, CO 81505 1 970.263.7800 1 Fax 970.263.7456 INTRODUCTION & OBJECTIVE This Basic Traffic Analysis summarizes findings of a traffic impact analysis performed for Hunter Ridge Energy Services, LLC's 003 596 compressor facility. The site is located approximately 25 travel miles north of the Exit 75 of Highway 1-70 at Parachute, Colorado. The facility is located approximately 14 travel miles beyond the Encana Guard Shack which is located near the north end of County Road (CR) 215. The subject site encompasses approximately 6.497 acres and is located within a 26,442 acre parcel. The property is owned Encana and the facility is operated by Encana personnel for Hunter Ridge Energy Services, LLC. Only Encana personnel and authorized contractors will access the facility. The facility is currently constructed. It is expected that the lifespan of the site will be approximately 30 years. The objective of this analysis is to review the existing road network, provide traffic projections for the facility, determine trip distribution, and analysis the need for roadway modifications. EXISTING ROAD NETWORK This facility will be accessed from the north end of CR 215 via a series of private roadways that begin near the Encana Guard Shack. According to the Garfield County Road Inventory Report, CR 215 is classified as Local road and is categorized as Rural Highway (R -B) according to the State of Colorado State Highway Access Category Assignment Schedule. CR 215 is a two lane asphalt roadway with gravel shoulders. The roadway pavement is considered to be in good condition according to the Garfield County 2011 HUTF Report. The road has a posted speed limit of 30 mph. During April of 2007, Garfield County Road & Bridge conducted a traffic study for CR 215. The study concluded that the average trips per day at that time was 4,258 vehicles; 73.8% of the vehicles were Class 3 and above (Heavy Vehicles) and 26.2% were Class 2 and below (Light Vehicles). A series of private roads beyond CR 215 provides further access to the site. This private road system crosses property owned by the Exxon Mobile Corporation and Encana. The Exxon Mobile Corporation has granted Encana the right to use this road across their property to access Encana's facilities. Hunter Ridge Energy Services, LLC is an Encana assets holding company. All access to the site will be by Encana personnel and their contactors. These roads were designed and maintained by the natural gas industry for their exclusive use and is not designed for public access. The roadway is constructed of gravel and native materials and is treated with a dust palliative as needed. This road is approximately 20 to 30 feet wide, and contains a series switch -backs and pull-outs. This roadway provides adequate and suitable private access to the 003 596 facility and natural gas operations in the general area. This private road system joins with two roads labeled CR 401 and CR 402 on maps provided on- line by the Garfield County GIS Department. These roads complete the access to the facility. Both of these roads are classified as a Local road with a fair, unimproved, natural road surface according to the Garfield County 2011 HUFT Report. TRAFFIC PROJECTIONS Given the lack of data regarding traffic growth for this area, a conservative growth rate of 3% was assumed. This rate was applied to the existing counts to obtain background traffic for the forecast years of 2013 and 2043, respectively. These planning horizon years were chosen as they correspond with the expected life of the facility. This results in an expected ADT of 5,236 vehicles per day (vpd) in 2013 and 12,710 vpd in 2043 on CR 215. TRIP GENERATION/DISTRIBUTION Trip generation is generally determined using rates found in the ITE Trip Generation manual. Rates from this publication are applied to values related to the size of the proposed site to estimate the trips expected to enter and exit the site. In this case, no rates are provided for facilities similar to these. To estimate trips expected for this site, information was gathered regarding the expected traffic based on the existing operations. The following table summarizes the expected average and maximum trips for the operational life of the facility. Table 1: Trip Generation — 003 596 Facility Phase Average Trips/Day Maximum Trips/Day Percent Trucks Total Trips/Phase Phase Duration Operation 3 3 0 % 32,850 30 years Based on the County's traffic study, the facility's related traffic will have a 0.057% increase on daily traffic activity during operations of the facility in 2013 and will have a 0.024% increase on daily traffic activity during 2043. Table 2 summarizes the expected percentage of trips this facility will generate on CR 215. Table 2: Trip Distribution — 003 596 Facility Year Estimated CR 215 VPD 003 596 Generated Trips/Day 003 596 Generated Trips/Day Percent of Total 2013 5,236 3 0.057% 2043 12,710 3 0.024% Note that the estimated lifespan of the site is expected to be approximately 30 years. CONSTRUCTION PHASE This site is currently built and is an existing facility. No construction traffic will be generated by this project. EXISTING PARCELS Current land use on the larger subject parcel is primarily natural gas development. The majority of existing traffic on CR 215 is related to natural gas development activities, limited agricultural activities and very low density rural residential uses. The private access road to the site exists and is permitted by Garfield County. No access to state highways or railroad crossings exists on the private road system. STATE HIGHWAYS AND RAILROAD CROSSINGS CR 215 is accessed by the State of Colorado highway system at either 1-70 at the Exit 75 interchange or by US 6 (1-70 Frontage Road) in Parachute, Colorado. The 1-70 interchange access point is controlled by signal lights. This interchange was significantly impacted by the traffic generated by the natural gas industry in the past. Much of the this impact has been mitigated by the reduction in industry activities due to natural gas market factors, aggressive water management operators in the area that has reduced water hauling and the recent construction of a new interchange approximately two (2) miles west of the Exit 75 interchange which allows some traffic to by-pass this interchange. The US6/I-70 Frontage Road access is controlled by signage. Additional roadway improvements or modifications are not warranted at these locations given the minor volumes the subject facility will generate, the existing traffic control measures and the present traffic conditions. CR 215 crosses a local at -grade railroad spur line approximately 1.5 miles north of the I-70/CR 215 interchange. This spur line is generally used for the delivery of gas industry supplies and the removal of bulk materials. Rail traffic at this crossing generally runs at a relatively low speed and at an irregular schedule. This railroad crossing is controlled by a warning signal. Additional improvements are not warranted at this location. Access to the series of private roads that lead to the facility is controlled at the Encana Guard Shack. This control point is designed to limit non -industry and non-essential traffic from this roadway. Additional traffic control modifications or roadway improvements are not needed at this location. RECOMMENDATIONS Based on the expected trip generation rates discussed above, the increase in average daily traffic is not expected to be significant. The worst-case scenario during operation of the facility is that there would be a minimal increase in light truck traffic. Based on the results of the analysis, no mitigation is recommended for the facility. As mentioned in the Auxiliary Lane Analysis, the addition of traffic by the site does not increase existing volumes to levels required for auxiliary lanes or other roadway modifications.