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Home My WebLink AboutWPO201500064 Erosion Control Narrative Erosion Control Plan 2015-09-03 s I r 11- ;;;I e NP Engineering,. Dated: September 3, 2015 ■® ■ Dav 1u ResIdencrt,' Driveway' Co3 trjol Na rafye I. NARRATIVE PROJECT DESCRIPTION: This project consist of the construction of a driveway to a residential dwelling (approximately 2,800 If). The project scope includes grading and installation of necessary culvert pipes and drainage.The disturbed area for the project is approximately 1.74 acres. Erosion control for the site will be managed using perimeter controls and a temporary silt trap. EXISTING SITE CONDITIONS: The site is located on Woodlands Road (SR 676) approximately 650 feet west of the intersection with Wingate Road. The site is currently wooded.The site slopes in general from west to east at approximately 3-5%.The site lies in the South Fork Rivanna River Reservoir watershed. ADJACENT AREAS: The site is bounded on the north by the South Fork Rivanna River Reservoir, to the east and west by rural area and to the south by Woodlands Road. Existing surface drainage is directed northwest. OFF-SITE AREAS: No off-site areas are affected. SOILS: According to the USDA SCS soils mapping,the project site lies in soils: 14C-Chester Loam 14D-Chester Loam 36C-Hayesville Loam 42B3-Hiwassee Clay Loam 42C3-Hiwassee Clay Loam The soils are described as: 14C—Chester loam, 7 to 15 percent slopes Properties and qualities • Slope: 7 to 15 percent • Depth to restrictive feature: More than 80 inches • Natural drainage class: Well drained • Runoff class: Medium • Capacity of the most limiting layer to transmit water(Ksat):Moderately high to high (0.57 to 1.98 in/hr) • Depth to water table: More than 80 inches • Frequency of flooding: None • Frequency of ponding: None • Available water storage in profile: Moderate (about 6.9 inches) Typical profile • HI -0 to 7 inches: loam • H2-7 to 41 inches:clay loam • H3-41 to 79 inches: loam NP ENGINEERING 680 IVY FARM DRIVE • CHARLOTTESVILLE, VA 22901 Phone:434.531.7387 Davis e`icence_ Dnvew,' / rosion Control Narrative This deep,strongly sloping,well drained soil is on narrow, convex ridgetops, the points of ridges, and narrow,convex side slopes. Permeability and available water capacity are moderate.Surface runoff is rapid.The hazard of erosion is severe.This soil has good tilth. The subsoil has low shrink-swell potential.The root zone extends to a depth of 40 inches or more. 14D—Chester loam, 15 to 25 percent slopes Properties and qualities • Slope: 15 to 25 percent • Depth to restrictive feature: More than 80 inches • Natural drainage class:Well drained • Runoff class: High • Capacity of the most limiting layer to transmit water(Ksat):Moderately high to high (0.57 to 1.98 in/hr) • Depth to water table: More than 80 inches • Frequency of flooding: None • Frequency of ponding: None • Available water storage in profile: Moderate (about 6.9 inches) Typical profile • HI -0 to 7 inches: loam • H2-7 to 41 inches: clay loam • H3-41 to 79 inches: loam This deep,strongly sloping,well drained soil is on narrow, convex ridgetops, the points of ridges, and narrow, convex side slopes. Permeability and available water capacity are moderate.Surface runoff is rapid.The hazard of erosion is severe. This soil has good tilth. The subsoil has low shrink-swell potential.The root zone extends to a depth of 40 inches or more. 36C—Hayesville loam, 7 to 15 percent slopes Properties and qualities • Slope: 7 to 15 percent • Depth to restrictive feature: More than 80 inches • Natural drainage class: Well drained • Runoff class: Medium • Capacity of the most limiting layer to transmit water(Ksat):Moderately high to high (0.57 to 1.98 in/hr) • Depth to water table: More than 80 inches • Frequency of flooding: None • Frequency of ponding: None • Available water storage in profile: High (about 10.6 inches) Typical profile • HI -0 to 7 inches: loam • H2-7 to 58 inches: clay • H3-58 to 67 inches: sandy clay loam NP ENGINEERING 680 IVY FARM DRIVE • CHARLOTTESVILLE, VA 22901 Phone:434.531.7387 Davis Residence Dravowaii Erosion C:ontdi l N rra'Cve • H4-67 to 83 inches: fine sandy loam This soil is deep,sloping and well drained.Soil is on narrow convex ridgetops.Slopes are smooth and about 200 to 400 feet long. Permeability and available water capacity of this soil is high. Depth to bedrock is approximately 80 inches. Potential frost action and shrink-swell potential is high,limiting the use of this soil as a building site or roadfill. 42B3—Hiwassee clay loam, 2 to 7 percent slopes, severely eroded Properties and qualities • Slope: 2 to 7 percent • Depth to restrictive feature: More than 80 inches • Natural drainage class: Well drained • Runoff class: Medium • Capacity of the most limiting layer to transmit water(Ksat):Moderately high to high (0.57 to 1.98 in/hr) • Depth to water table: More than 80 inches • Frequency of flooding: None • Frequency of ponding: None • Available water storage in profile: Moderate (about 8.4 inches) Typical profile • H1 -0 to 8 inches: clay loam • H2-8 to 79 inches: clay Low strength and moderately permeable, clayey subsoil are the main limitations for nonfarm uses. Low strength and the clayey subsoil limit use of this soil as a building site. The clayey, moderately permeable subsoil is a limitation for some sanitary facilities. 42C3—Hiwassee clay loam, 7 to 15 percent slopes, severely eroded Properties and qualities • Slope: 7 to 15 percent • Depth to restrictive feature: More than 80 inches • Natural drainage class: Well drained • Runoff class: Medium • Capacity of the most limiting layer to transmit water(Ksat):Moderately high to high (0.57 to 1.98 in/hr) • Depth to water table: More than 80 inches • Frequency of flooding: None • Frequency of ponding: None • Available water storage in profile: Moderate (about 8.4 inches) Typical profile • HI -0 to 8 inches: clay loam • H2-8 to 79 inches: clay Low strength and moderately permeable, clayey subsoil are the main limitations for nonfarm uses. Low strength and the clayey subsoil limit use of this soil as a building site. NP ENGINEERING 680 IVY FARM DRIVE • CHARLOTTESVILLE, VA 22901 Phone:434.531.7387 Davis Residence Driveway Erosion ( onirol Narrative The clayey, moderately permeable subsoil is a limitation for some sanitary facilities. CRITICAL EROSION AREAS: There are no areas defined as critically erosive. However, care should be taken on a daily basis to maintain the erosion control structures to prevent silt from leaving the construction site.Specifically,silt fence is to be constructed along the sides of the work zone to intercept and detain sediment. A construction entrance is to be provided to prevent tracking of mud into the public right-of-way by construction vehicles. Inlet protection is to be provided to prevent sediment from entering the culvert pipes upon construction of the culverts. CONSTRUCTION SEQUENCE: Construction shall follow the follow sequencing to minimize erosion: 1) Install silt fence (SF) in designated areas. 2) Install Construction Entrance (CE) as indicated on the plans. 3) Install silt trap. 4) Clear and grub,strip top soil and stockpile for respread. 5) Rough grade site and install culverts. 6) Install inlet protection (IP) and outlet protection (OP) around culverts. 7) Proof roll subgrade. Upon proof roll approval by geotechnical engineer,install aggregate base. 8) Provide temporary seeding and other erosion control devices to minimize transport of sediment. 9) Prepare landscaping areas. 10) Apply permanent seeding (PS),landscaping and mulch (MU) to all denuded areas as indicated on the plans as soon as possible. 11) Temporary sediment control structures are to remain in place and will be removed only when a satisfactory stand of permanent grass is present. Upon approval, remove temporary erosion control measures, remove unsuitable material to an approved location,and stabilize affected areas. 12) Project closeout. EROSION AND SEDIMENT CONTROL MEASURES: The measures noted below and on the accompanying drawings are to be constructed and maintained by the contractor in accordance with the latest edition of the Albemarle County Code and the Virginia Erosion and Sedimentation Control Handbook, Third Edition, 1992. Symbols, details, and dimensions used are taken from the handbook, as well as the Virginia Department of Transportation Road and Bridge Standards, Volume 1,2001. A. STRUCTURAL PRACTICES: 1. Temporary construction entrance (CE), 3.02:Temporary construction entrance shall be provided and maintained as shown on the plan sheet. 2. Silt Fence (SF), 3.05:Silt fence barriers shall be installed down slope of areas with minimal grades to filter runoff from sheet flow as indicated on the plan sheet. 3. Storm Drain Inlet Protection (IP),3.07:Storm drain inlet protection shall be provided for inlets as shown on the plans. 5. Rock Check Dams (CD), 3.20: Rock check dams are to be installed in the NP ENGINEERING 680 IVY FARM DRIVE • CHARLOTTESVILLE, VA 22901 Phone:434.531.7387 Davisesi;: ncFF Driveway Etos,on Control Narrate r::: diversion ditches as needed to reduce velocity of concentrated flow and the potential of erosion. 6. Dust Control (DC), 3.39: Provide dust control in areas subject to surface and air movement of duct where on-site and off-site damage is likely to occur if preventive measures are not taken. 7. Temporary Silt trap shall be installed and maintained per VESC 3.13. B. VEGETATIVE MEASURES: 1. Topsoiling &Stockpiling (TO), 3.30:Topsoil will be stripped from areas to be graded and stockpiled for later use.Stockpiles are to be stabilized with temporary vegetation and have silt fence installed along the lower perimeter.Stockpile locations to be approved by Albemarle County. 2. Temporary Seeding (TS), 3.31: All denuded areas which will be left dormant for extended periods of time shall be seeded with fast germinating temporary vegetation immediately following grading.Seed selection will be dependent on the time of year in accordance with the VESC. 3. Permanent Seeding (PS),3.32: Permanent seeding shall be provided on site to provide stabilization for all disturbed areas.Seeding rates are in pounds per acre. For high maintenance lawn areas apply 200-250 pounds of Kentucky 31 fescue, 2 pounds of red top grass, and 20 pounds of seasonal nurse crop.The seasonal nurse crop used is based on the following seeding dates: a. From February 16 through April, use annual rye; b. From May 1 through August 15, use foxtail millet; c. From August 16 through October, use annual rye; d. From November through February 15, use winter rye; All permanent seeding shall be fertilized, limed and mulched at the following rates: Fertilizer 10-20-10 at a rate of 1000 pounds per acre: lime of agricultural grade limestone at a rate of 2 tons per acre:and straw mulch at a rate of 1 1/2 tons per acre. Before seeding, 4 inches of topsoil shall be spread in areas to be seeded. Apply fertilizer and lime uniformly and mix well into top 4 inches of seed bed. Prepare soil for permanent seeding by tillage of topsoil in place to loosen thoroughly and breakup all clods to a depth of 6 inches. Remove all stumps and roots, coarse vegetation,stones larger than 1 1/2 inches and all construction debris.Soil shall be worked by suitable agricultural equipment to a depth of not less than 4 inches.Surface shall be uniform,smooth and drainable. A firm and compact seed bed is required. 4. Mulching (MU),3.35: All temporary and permanent seeding shall be straw mulched. C. MINIMUM STANDARDS: MS-1 Stablilization of denuded areas: Permanent or temporary soil stabilization shall be applied to denuded areas with 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 or undisturbed for longer than 30 days. Permanent stabilization shall be applied to areas that are to be left dormant for more than one year. MS-2 Stablilization of soil stockpiles: During construction of the project,soil stockpiles and borrow areas shall be NP ENGINEERING 680 IVY FARM DRIVE • CHARLOTTESVILLE, VA 22901 Phone: 434.531.7387 Drivcmay Eiosior Cor?iroi Nfedrr T?vE stabilized or protected with sediment trapping measures.The contractor is responsible for temporary protection and permanent stabilization of all stockpiles on site as well as borrow areas and soil intentionally transported from the project site. MS-3 Permanent Vegetative Cover: 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, in the opinion of the EBBS inspector, is uniform and mature enough to survive and inhibit erosion. MS-4 Timing and stabilization of silt trapping measures: Storm inlet protection,silt fencing,and other measures intended to trap sediment shall be constructed as a first step in any land disturbing activities and shall be made functional before upslope land disturbance takes place. MS-5 Stabilization of earthen structures: Stabilization measured shall be applied to earthen structures such as dikes and diversions immediately after installation. MS-6 Sediment basins and traps: Not used. MS-7 Cut to Fill slopes: Cut to fill slopes shall 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-8 Concentrated runoff down cut or fill slopes: 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-9 Water seepage from a slope face: Whenever water seeps from a slope face,adequate drainage or other protection shall be provided. MS-10 Storm Inlet Protection: All storm inlets that are operable during construction shall be protected so that sediment laden water cannot enter the conveyance system without first being filtered or otherwise treated to remove sediment. MS-11 Stabilization of outlets: Not used. MS-12 Work in live watercourses: Not used. MS-13 Crossing a live watercourse: Not used. MS-14 Applicable Regulation: All applicable federal,state and local regulations pertaining to working in or crossing live watercourses shall be met. NP ENGINEERING 680 IVY FARM DRIVE • CHARLOTTESVILLE, VA 22901 Phone:434.531.7387 :Davis Residenioo Driveway L usir,::1 3 Cc n i Nay.,. MS-15 Stabilization of bed and banks: Not used. MS-16 Underground utilities: Underground utility lines shall be installed in accordance with the following standards, in addition to other applicable criteria: a. No more than 500 lineal feet of trench may be opened at one time; b. Where consistent with safety and space considerations,excavated material is to be placed on the uphill side of trenches, except for any diversion ditches; c. Effluent from dewatering operations shall be filtered or passed through an approved sediment trapping device, or both, and discharged in a manner that does not adversely affect flowing streams or offsite property; d. Trench backfill material shall be properly compacted in order to minimize erosion and promote stabilization; e. Restabilization shall be accomplished in accordance with these regulations; f. All applicable safety regulations shall be complied with at all times. MS-17 Construction access routes: Where construction vehicle access routes intersect paved or 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 paved or public road, the road surface shall be cleaned thoroughly at the end of each day.Sediment shall be removed by shoveling or sweeping and transported to a sediment disposal area.Street washing shall be allowed only after sediment is removed in this manner.This provision shall apply to individual development lots as well as larger land-disturbing activities. MS-18 Temporary E&S Control measure removal: All temporary erosion and sediment control measures shall be removed within 30 days after final site stabilization or after temporary measures are no longer needed, unless otherwise authorized by the local E&S authority.Trapped sediment and the disturbed soil areas resulting from the disposition of temporary measures shall be permanently stabilized to prevent further erosion and sedimentation. MS-19 Adequacy of receiving channels: Properties and waterways downstream from the development site shall be protected from sediment deposition, erosion and damage due to increases in volume,velocity and peak flow rates of storm water runoff for the stated frequency storm of 24-hour duration. D. MAINTENANCE: All erosion and sediment control structures and systems shall be maintained, inspected, and repaired as needed to insure continued performance of their intended function. All erosion and sediment control measures shall be checked at the end of each day and after every rainfall event. 1. Damage to erosion control measures caused by construction traffic or other activity shall be repaired before the end of each working day. 2. Maintain all seeded areas until a uniform stand is accepted. 3. Provide for equipment washing as needed to prevent the transport of soil NP ENGINEERING 680 IVY FARM DRIVE • CHARLOTTESVILLE, VA 22901 Phone:434.531.7387 Davis RCsiderce Th Erosion Controi Ne,lnipTive onto existing asphalt roadways. 4. Both temporary and permanent roads and parking areas may require periodic top dressing with new gravel. 5. Silt fence barriers will be checked daily for undermining or deterioration of the fabric.Sediment shall be removed when the level reaches half way to the top of the barrier. 6. Sediment shall be removed from around the inlet protection trap structure and restored to its original dimensions when the sediment has accumulated to one-half the design depth of the trap.The trap structures shall be removed and the area stabilized when the remaining drainage area has been properly stabilized. 7. Sediment accumulated within diversions shall be removed from the channel and repairs made as necessary. 8. Sediment should be removed from rock check dams when it reaches one-half of the original height of the measure. Regular inspections should be made to insure that the center of the dam is lower than the edges. Erosion caused by high flows around the edges of the dam should be corrected immediately. 9. All soil stabilization blankets and matting shall be inspected after rainstorms to check for erosion and undermining. If washout or breakage occurs,reinstall the material after repairing damage to the slope or ditch. NP ENGINEERING 680 IVY FARM DRIVE • CHARLOTTESVILLE, VA 2 29 0 1 Phone:434.531.7387 m *.i.e r pPr u& n E, 'm 2- I OW N C t C! , ll ' a o sI N ? `a o�E'.e w 1 <4� i J? Inv ::. ®saa 8 Lu A y v O r 00A� 1,4 °. �;w d it ��v> � p20 i,,,..„:11-10-____:( o,��,W - - , $-6Z6 inic0 400t�v�� `� o r--- ... _., (--\"r.' 1 ` „'8tb � \ , N ,f,'4" '�'94 // 452-ft— 'v 1> _ \ ; kic r , (- , „_., 4 i ,,, , , CI) \\\ ‘\ M m kiiit, czilo fc.4 <,i'sf' \ 't 4 k. ,. 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