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HomeMy WebLinkAboutWPO201400061 Plan - E&S 2014-06-24 EROSION AND SEDIMENT CONTROL PLAN Seven Oaks Albemarle LLC 94 Landfill Road Edinburg, Va. 22824 Prepared By David C Wyant, P. E. 4686 Garth Road Crozet, VA 22932 June 24, 2014 APPROVED by the Albemarle County Community Development Department Date r a z ti - z r I L File cop() zctq vcc, 6t EROSION AND SEDIMENT CONTROL PLAN Seven Oaks Albemarle LLC 94 Landfill Road Edinburg, Va. 22824 Prepared By David C Wyant, P. E. 4686 Garth Road Crozet, VA 22932 June 24, 2014 Project Description The owner of parcel 27-6B which is located adjacent to State Route 810 north of Doylesville in western Albemarle County, Virginia proposes to construct a clear span bridge over the Doyles River to access the parcel from a public road. The purpose of this plan is to describe the erosion and sediment control measures proposed during the construction. Approximately 0.1 acre of the 115.23-acre parcel will be disturbed during the clearing operation. Existing Site Conditions Parcel 27-6B fronts on the east side of State Route 810. The parcel is also bounded by other large rural parcels on all other sides. Most of the 115- acre parcel is east of the Doyles River which is east of State Route 810. The terrain in this area of the lot slopes to the west. Runoff from the parcel is in the form of mostly sheetflow in addition to several drainage swales into the Doyles River. The highest point on the parcel is approximately 784 feet near the center of the parcel while the lowest elevation is approximately 700 feet along the Doyles River. The average slope across the parcel is 12%. 2 Adjacent Areas The adjacent properties are zoned RA and have heavy mixed vegetation (grass and woods). There should be no offsite stormwater runoff from the construction area, since there is native vegetation around the disturbed area, silt fences will also surround the disturbed area, and permanent stabilization will be established as soon as feasible possible to provide maximum protection of the boyles River. Waste and Borrow Areas It is anticipated that borrow material will be needed to construct the approaches to the bridge. The majority of the borrow material will be used on the western approach as the east end of the bridge will rest on bedrock in an old farm roadbed. In no case shall the contractor haul material to or from an off-site area that does not already have a soil erosion control plan approved by the Local Program Administrator or the material comes from a commercial aggregate producing site. If during construction topsoil and surplus soil is stockpiled the stockpiled area will have a silt fence installed so as to not allow silt to leave the area (MS-2). Soils The soils in this area have not been classified, but the soils are generally silty clays or sandy soils. These soils have a moderate infiltration rate when thoroughly wet. The soils are moderately deep or deep and moderately drained or well drained, and have moderately fine to moderately coarse texture. The soils' transmission or permeability rate is considered moderately rapid to slow. Surface runoff is medium to rapid and erosion potential is moderate to severe. The erosion factor, K, is 0.32. Erosion and Sediment Control Measures All E&S measures shall be installed and maintained as specified in the latest edition of the Virginia Erosion and Sediment Control Handbook (VESC). The following E&S measures and its VESCR STD. & SPEC. will be used on this 3 project: permanent stabilization (P5-3.32), temporary seeding (T5-3.31), silt fence (5F-3.), dust control (DC-3.39), and mulching (MU-3.35). If work necessitates the use of any addition measure(s), the contractor will use them. Descriptions and other details of all E & 5 measures included in this report will be attached to the report returned to the owner and contractor during the pre-construction conference with the county staff. Concentrated stormwater should not be allowed to flow down any slopes (MS-7). (M5-4) Any silt trap (ST) needed should be constructed prior to any construction activity on the site. Silt fence measures should be used around any stockpiles (MS-2) or at any location where sediment-laden water could leave the construction site. Silt fence measures will be constructed between each bridge abutment and the river to prevent any silt or other material from entering the river. Temporary protection and permanent stabilization of all soil stockpiles on site as well as borrow areas and soil intentionally transported from the site must be stabilized or protected with sediment trapping measures, if approved by the Local Program Administrator after an amended E & 5 Control Plan is submitted. (MS-17) Where construction vehicles access paved public roads, provisions shall be made to minimize the transport of sediment by vehicular tracking onto the paved surface. Where sediment is transported onto a public road surface, the road shall be cleaned thoroughly at the end of each day. Sediment shall be removed from the road by shoveling or sweeping and transported to a sediment control disposal area. Street washing shall be allowed only after sediment is removed in this manner. (MS-1) All disturbed areas shall be fertilized, seeded (TS-3.31), and mulched (MU-3.35) within 2 days after the completion of grading. Sections 3.31, 3.32, and 3.35 of the VESCR Handbook allow 7 days to complete the seeding but the time was decreased on this project since USFWS requested additional protection of the Doyles River. It is envisioned that temporary seeding will be needed anytime that small perimeter areas need stabilization before permanent seeding is installed. Stabilization measures shall be applied to earthen structures such as dams, dikes, and diversions immediately after installation (MS-5). 4 All temporary erosion and sediment control measures shall be removed within 30 days after final site stabilization or after the temporary measures are no longer needed, unless authorized by the Local Program Administrator. Trapped sediment and the disturbed soil areas resulting from the disposition of the trapped sediment shall be permanently stabilized to prevent further erosion and sedimentation (MS-18). Cut and fill slopes must be constructed in a manner that will minimize erosion. Slopes that are found to be eroding excessively within one year of permanent stabilization shall be provided with additional slope stabilizing measures until the problem is corrected (MS-7). Concentrated runoff shall not flow down cut or fill slopes unless contained within an adequate temporary or permanent channel, flume, or slope drain structure (MS-8). Wherever water seeps from a slope face, adequate drainage or other protection shall be provided (MS-9). All storm sewer inlets that are made operable during construction shall be protected by culvert inlet protection measures (CIP) so that sediment-laden water cannot enter the conveyance system without first being filtered or otherwise treated to remove sediment (MS-10). Before newly constructed stormwater conveyance channels or pipes are made operational, adequate outlet protection and any required temporary or permanent channel lining shall be installed in both the conveyance channel and receiving channel (MS-11). The following minimum standards are not applicable on this project: (N/A) When work in a live watercourse is performed, precautions shall be taken to minimize encroachment, control sediment transport, and stabilize the work area to the greatest extent possible during construction. Nonerodible material shall be used for the construction of causeways and cofferdams. Earthen fill may be used for these structures if armored by nonerodible cover materials (MS-12). (N/A) When a live watercourse must be crossed by construction vehicles more than twice in any six-month period, a temporary vehicular stream crossing constructed of nonerodible material shall be provided (MS-13). 5 Both abutments will be constructed out of the river. The contractor will be required to access the east abutment site via private roads on other parcels of land that presently have access to a second public road. (N/A) All applicable federal, state and local regulations pertaining to working in or crossing live watercourses shall be met (MS-14). No work will be done in the river nor from May 15th to August 1St (USFWS requirement). (N/A) The bed and banks of a watercourse shall be stabilized immediately after work in the watercourse is completed (MS-15). Underground utility lines shall be installed in accordance with the following standards in addition to other applicable criteria: a. No more than 500 linear feet of trench may be opened at one time. b. Excavated material shall be placed on the uphill side of trenches. c. Effluent from dewatering operations shall be filtered or passed through approved sediment trapping device, or both, and discharged in a manner that does not adversely affect flowing streams or off-site property. d. Material used for backfilling trenches shall be properly compacted in order to minimize erosion and promote stabilization. e. Restabilization shall be accomplished in accordance with these regulations. f. Applicable safety regulations shall be complied with (M5-16). Albemarle County general construction notes and general construction notes for E & 5 control plans are attached to this report and should be adhered to during construction. All work including any staging being done within construction limits. The following is the suggested order of work: 6 1. Install the silt fences (SF) 2. Clear minimum of vegetation and cause minimum disturbance to construct the abutments and approaches 3. Apply temporary seeding to areas not ready for permanent seeding (MS-1). 4. Apply permanent seeding (PS) and mulch (MU) to stockpiles and all denuded areas ready for permanent stabilization (MS-1 & 2). 5. Any temporary sediment control structures (CE, SF, CIP, etc.) are to remain in place and will be removed only when a satisfactory stand of permanent grass is present and the upstream areas are stable with stone or pavement (MS-18). 6. After permanent stabilization all measures used to collect sediment must be cleaned out and properly stabilized. Dust Control Dust control (DC) shall be handled as specified in 3.39 of the VESCR Handbook. Permanent Stabilization (MS-3) All permanent stabilization (P5-3.32) shall conform to the STD. & SPEC. in the VESCR Handbook. A permanent vegetative cover shall be established on denuded areas not otherwise permanently stabilized. Permanent vegetation shall not be considered established until a ground cover is achieved that, is uniform, is mature enough to survive, and will inhibit erosion. Permanent or temporary stabilization (TS) shall be applied to denuded areas within 2 days after final grade is reached on any portion of the site. Temporary soil stabilization shall be applied within 2 days to denuded areas that may not be at final grade but will remain dormant (undisturbed) for longer than 30 days. Permanent stabilization shall be applied to areas that are to be left dormant for more than one year. In order to meet an USFWS requirement the number of days before treatment has been reduced from 7 days to 2 days. If sediment basins, sediment traps, perimeter dikes, sediment barriers or any other measures intended to trap sediment are determined to be needed by the contractor, then they shall be constructed as a first step before any upslope land disturbing activity takes place. Maintenance All measures are to be inspected, maintained, and repaired as specified in the VESCR Handbook. At least weekly inspection shall be performed on all measures and always the day after any storm event. When the pool area behind any measure (sediment trap, silt fence, etc.) reaches one-half of the capacity of the pool area, the silt shall be removed and disposed in a protected area for seeding. Responsible Land Disturber David C. Wyant, P.E. 4686 Garth Road Crozet, Va. 22932 Lic. 07511 Stormwater Management (MS-19) . (M5-19) Properties and waterways downstream from development sites shall be protected from sediment deposition, erosion and damage due to increases in volume of stormwater runoff. a. Concentrated stormwater runoff leaving a development site shall be discharged directly into an adequate natural or man-made receiving channel, pipe or storm sewer system. b. If existing natural receiving channels or previously constructed man-made channels or pipes are not adequate, the applicant shall: (1) Improve the channel to a condition where flow will not overtop the banks or cause erosion to the channel bed or banks; or 8 (2) Provide a combination of channel improvement, stormwater detention or other measures which is satisfactory to the plan approving authority to prevent downstream erosion. c. The applicant shall provide evidence of permission to make the improvements. d. If the applicant chooses an option that includes stormwater detention he shall obtain approval from the locality of a plan for maintenance of the detention facilities. The plan shall set forth the maintenance requirements of the facility and the person responsible for performing the maintenance. e. Outfall from a detention facility shall be discharged to a receiving channel, and energy dissipators shall be placed at the outfall of all detention facilities as necessary to provide a stabilized transition from the facility to the receiving channel. f. Increased volumes of sheet flows that may cause erosion or sedimentation on adjacent property shall be diverted to a stable outlet, adequate channel, pipe or pipe system, or to a detention facility. g. In applying these stormwater runoff criteria, individual lots or parcels in a residential, commercial or industrial development shall not be considered to be separate development projects. Instead, the development, as a whole, shall be considered to be a single development project. h. All measures used to protect properties and waterways shall be employed in a manner which minimizes impacts on the physical, chemical, and biological integrity of rivers, streams and other waters of the state. 9 x r a i L # myµ 9{ Nk -/tok 44. iffita *St ► r s , `:_ n LES hiiVL i+ w En Y A l.' L- , .., r . ,, rte,C'v.?°4 '� _._ _ s ■ c S3 �=1 ■ *, rI n 3 I v • /1/2 x Order of Work - Lewis Bridge 1. Install silt fence 2. Clear approach areas 3. Construct abutments 4. Let abutments cure for 30 days 5. Construct approaches and entrance 6. Install rip rap on sides of approaches and between the abutments and the stream 7. Install steel beams 8. Install wood members to bridge 9. Install finish surface to approaches 10.Construct farm road on east side of stream to a point selected by the county staff r� z LF' !q I 411, ,... 1110MIN ...... _„ • ,,• 4 , • , • . ,- - ICIP ■ : *F410" ' 0 4 do. ,..*t .'.. 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