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HomeMy WebLinkAboutWPO201400062 Plan - Approved 2014-07-17EROSION AND SEDIMENT CONTROL PLAN Bruce or Paula Campbell 4261 Free Union Road Free Union, Va. 22940 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 - 1 7 Z �` 4 File w c z c I Lt o c o 6n L EROSION AND SEDIMENT CONTROL PLAN Bruce or Paula Campbell 4261 Free Union Road Free Union, Va. 22940 Prepared By David C Wyant, P. E. 4686 Garth Road Crozet, VA 22932 June 24, 2014 Project Description The owners of parcel 29 -41A which is located on State Route 601 in Free Union in Albemarle County, Virginia, has cleared the yard of their residence to get a better grade on the lawn, plant shrubs, and install a small retaining wall. The purpose of this plan is to describe the erosion and sediment control measures proposed during the establishing of vegetation on the parcel. Approximately 0.4 acre (17,400 sq. ft.) of the 1.0 -acre parcel was disturbed during the clearing operation. Existing Site Conditions Parcel 29 -41A fronts on the east side of State Route 601. The parcel is also bounded by residential parcels on all other sides. The terrain on the lot slopes to the west. Runoff from the parcel in the form of sheetf low drains in the same direction. The highest point on the parcel is approximately 596 feet at the northeast corner of the parcel, while the lowest elevation is 586 feet at a culvert under State Route 601. The average slope across the parcel is 5.0 %. 2 Adjacent Areas The adjacent properties are zoned RA. There should be no offsite stormwater runoff, since the retaining wall intercepts the runoff from the back of the lot, silt fences were installed along the upper side of the retaining wall and in front of the culvert inlet, and permanent stabilization has been applied at the completion of the rough clearing. No streams, lakes, rivers, or residential areas will be affected by the construction. Waste and Borrow Areas It is not anticipated that any borrow material will be needed nor any excess material will be generated, since the work will only be to clear the parcel of undesirable vegetation. 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. 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. These soils have a moderate infiltration rate when thoroughly wet. The soils are moderately deep or deep and moderately well 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 very rapid and erosion potential is moderate to very 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 project: permanent stabilization (PS- 3.32), temporary seeding (TS- 3.31), silt 3 fence (SF- 3.06), culvert inlet protection (CIP- 3.08), 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 at the pre- construction conference. Concentrated stormwater should not be allowed to flow down any slopes (MS -7). (MS -4) No silt traps are planned for this work. Silt fence measures should be used around any stockpiles (MS -2) or at any location where sediment - laden water could leave the construction site. 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 vehicle 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 roads 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. This provision shall apply to individual subdivision lots as well as to larger land disturbing activities. (MS -1) All disturbed areas shall be fertilized, seeded (TS- 3.31), and mulched (MU -3.35) within 7 days after the completion of grading, according to 3.31, 3.32, and 3.35 of the VESCR Handbook. 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). 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 otherwise authorized by the Local Program Administrator. Trapped sediment and the disturbed soil areas resulting 4 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). (N /A) All applicable federal, state and local regulations pertaining to working in or crossing live watercourses shall be met (MS -14). 5 (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 (MS -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: 1. Install the silt fences (5F) 2. Begin grading and clearing of the parcel 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 (PS -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 7 days after final grade is reached on any portion of the site. Temporary soil stabilization shall be applied within 7 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. 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) . (MS -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 (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 8 maintenance requirements of the facility and the person responsible for performing the maintenance. e. Outf all 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 i