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Home My WebLink Aboutpg 5CONSTRUCTION SPECIFICATIONS 1. Clear the area of all debris that might hinder excavation and disposal of spoil. 2. Grade shallow depression uniformly towards the inlet with side slopes no greater than 2:1. Grade a 1 -foot wide level area set 4 inches below the area adjacent to the inlet 3. Install the Class B or Class I riprap in a circle around the inlet The minimum crest width of the riprap should be 18 inches, with a minimum bottom width of 7.5 feet The minimum height of the stone is 2 feet 4. The outside face of the riprap is then lined with 12 inches of NC DOT #5 or #57 washed stone. "I tua Gfjcp7 Inspect rock doughnut inlet protection at least weekly and after each significant (1/2 inch or greater) rainfall event and repair immediately. To provide satisfactory inlet protection efficiency, remove sediment from the sediment pool area when the volume is decreased by half. This will help provide adequate storage volume for the next rain, Stabilize excavated material appropriately. Take care not to damage or undercut the structure during sediment removal. Remove debris from the inlet and replace stone as needed. If the inlet was Covered with wire mesh the mesh should be cleaned of debris. When the contributing drainage area has been adequately stabilized, remove all materials and dispose of sediment properly. Bring the disturbed area to the grade of the drop inlet Smooth and compact as it is needed. Appropriately stabilize all bare areas around the inlet with ground cover. nFWATFRING CONCRETE BLOCK TEMPORARY SEDIMENT POOL 1' MIN 2' MAX SEDIMENT 2:1 SLOPE GRAVEL FILTER WIRE DEWATERING SCREEN / TYPICAL BLOCK & GRAVEL INLET PROTECTION DETAIL NTS PERMANENT SEEDING SPECIFICATION 1. All disturbed areas shall be dressed to typical sections and plowed to a depth of 5 inches. e uniform seedbed. NOTE: Line should be The top 2 inches spoil pulverized to prod n applied with necessary equipment provide to give uniform distribution of these materials. The hand - bucket method Is not acceptable. Lime and fertilizer should be incorporated into the soil prior to 2. The following are rates and kinds of these materials to be applied PER ACRE: KM RATES Abruzzi Rye 50 lbs. Pensacola Bohiagrass 50 Ibs Kentucky 31 Fescue 50 Ibs Korean Lespedezo 15 Ibs, Centipedegross 50 Ilia. Common Bermudegross 25 Ibs 10 -20-20 Fertilizer 500 Ibs Agricultural Limestone 4000 Ibs, 3. Seeded area shall be cultipacked to firm seedbed and to cover seed. 4. Grain straw shelf be applied over seeded areas as mulch. No bare ground shall be visible In the mulched area if proper applications is achieved. Thick clumps of straw are not permissible as uniform coverage is expected. Straws shall be applied at a minimum of 4000 5. The mulched area shall be tacked with liquid asphalt sufficient too hold straw In place where directed by Engineer. 6. Ditch treatment shall be used in areas where steep grades could cause ditch erosion. Use of juts mesh, excelsior molting, or fiberglass roving is acceptable. ditch treatment should be Installed before mulching operation. 7. Builder Is to provide a permanent ground cover sufficient to restrain erosion on such exposed areas within 15 working days or 90 calendar days, whichever is shorter, after completion of construction or development Approved Tall Fescue Cultivate: Anthem Adventure Adventure it Amigo Austin Apache Apache II Arid Chapel Hill Brookstone Bonanza Bonanza II Crossfire II Chesapeake Chieftain Coronado Falcon Debutante Duster Falcon Genesis Finelawn Petite Finelawn Fhnelown I Jaguar Grande Guardian Houndog Monarch Jaguar III Kentucky 31 Kitty Hawk Pacer Montauk Mustang Olympic Rebel Phoenix Pixie Pyramid Safari Rebel Jr. Rebel II Renegade Tomahawk Shenandoah Tempo Titon welfpock Trailblazer Tribute Vegas Wrangler Fertilizer shall be 10 -20 -20 analysis. Upon written approval of the Engineer, a different analysis of fertilizer may be used provided the 1 -2 -2 ratio is maintained and the rate of application adjusted to provide the same amount of plant food as a 10 -20 -20 analysis. SIDE EXCAVATED AREA (A4 REaUREW TEMPORARY EXCAVATED DROP INLET PROTECTION NIS T+'llx CQNSIBUCTION S-+Y1.lS ABIQ'_ 1. Clear the entrance and exit area of all vegetation, roots, and other objectionable material and properly grade it. 2. Place the gravel to the specific grade and dimensions shown on the plans, and smooth it 3. Provide drainage to carry water to a sediment trap or other suitable Outlet. 4. Use geotextile fabrics because they improve stability of the foundation In locations subject to seepage or high water table. MAINTENANCE Maintain the gravel pad in a condition to prevent mud or sediment from leaving the construction site. This may require periodic topdressing with 2 -inch stone. After each rainfall, Inspect any structure used to trap sediment and clean it out as necessary. Immediately remove all objectionable materials spilled, washed, or tracked onto public roadways. ZZ- GRAVEL ENTRANCE SHALL BE 50 FEET IN LENGTH AND 20 FEET IN WIDTH WITH 20 FOOT RADIUS AT EXISTING ROADWAY 36' -0' MIN 4' -0' 10' -0' 6 FILTER FABRIC -3' WASHED STONE GRAVEL CONSTRUCTION ENTRANCE TEMPORARY GRAVEL CONSTRUCTION ENTRANCE N.T.S. IESI➢JZER TOPDRESSINC Fertilizer used for topdressing on all roadway areas except slopes 21 and steeper shall be 10 -20 -20 written approval of the Engineer, a different analysis of fertilizer may be used provided grade and shelf be applied at the rate of 500 pounds par cue (560kg per hectare). Upon the 1 -2 -2 ratio is maintained and the rate of application adjusted to provide the same amount of plant food as 10 -20-20 analysis. Fertilizer used for topdressing on slopes 2-1 and steeper and waste and borrow areas shall be 16 -8-8 grade Card shall be applied at the rate of 500 pounds per acre (560 kg per hectare). Upon written approval of the Engineer, a different analysis of fertilizer may be used provided the 2 -1 -1 ratio Is maintained and the rate of application adjusted to provide the same amount of plant food as 16 -8 -8 analysis. Crimping Straw Mulch: Crimping will be required on these project adjacent to any section of roadway where traffic Is to be maintained or allowed during construction. In areas within six feet (2 maters) of the edge of pavement, straw is to be crimped and the immediately tacked with asphalt tack. Crimping of straw In lieu of asphalt tack will be allowed an this project subject to the following conditions: All areas seeded and mulched shall be crimped and /or tacked with asphalt as directed by the Engineer. Crimping will be limited to slopes 4:1 a flatter unless the Contractor can demonstrate to the Engineer that the steeper slopes can be negotiated without altering the typical section. Straw mulch to be of sufficient length and quality to withstand the crimping operation and provide adequate ground cover. Crimping equipment including power source shall be subject to the approval of the Engineer providing that maximum spacing of crimper blades shall not exceed 6 Inches (200 mm). MARTENANCE SCHEDULE: 1. All erosion and sediment control practices will be checked for stability and operation following every storm event, but in no case less than once every week. Any repairs or cleaning necessary to maintain erosion and sediment central practices shall be completed immediately. 2. All seeded areas will be refertllized, reseeded as necessary, and mulched according to the The kindo of seed and fertilizer, and the rates of application of seed, fertilizer, and limestone, shall be as stated below. During periods of overlapping dates, the kind of seed to be used shall be determined by the Engineer. All rates per care (kilograms per hectare.) March 1 - August 31 September 1 - February 28 50p (55kg) Tall Fescue 50g (55kg) Tali FEscue 51 (6kg) Centipede 5fl (6kg) Centipede 25y (28kg) Bennudagrass (hulled) 35/f (40kg) Sermudagras (unhulled) 5009 (560kg) Fertilizer 500§ (560kg) Fertilizer 4000g (4500kg) Limestone 40008 (4500kg) Limestone Slopes 21 and Steeper and Waste and Borrow Locations: March 1 - August 31 September i - February 28 75/ (8%9) Tall Fescue 75@ (85kg) Tall Fescue 25/ (28kg) Bermudograss (hulled) 35g (40kg) Bermudagras ( unhulled) 500/ (560kg) Fertilizer 500# (560kg) Fertilizer 4000# (4500kg) Limestone 4000/! (4500kg) Limestone mrevATrn IrCA AS PEWIINFa TEMPORARY EXCAVATED INLET PROTECIION Nis CONSIRuanON SPECIFICATIONS t. Clear the area of ad debris that might NMer, excmvtbn ant disposal of •poll. 2 Grade the approach W the inlet unibnaly. J. Protect well Were by Vmei. 4. When the eartrTWhg drdnage area has ban penman W ablabre. erel wear, holes. hl Lee bwin with ebble *a W real gred'mg ebhr bas, compact a propey. rare abl,ek C. MAINTENANCE iregct, clean, ead propwly mainbbmn the exconted b ®in afro •wry rdb. urlNl raw roniribanng draboxi area hen been pemwnenay staNRxed. To praeide eaee- frctay heel. et cxvrc , romow eedimeat when the vxume of the basin has been reduced by one -hot. Spread all emc bd material awry over the eur- m ridhlg land am ur at«kbnro end ebabirae n appropnatey. LAST SAVED: 1 /26/2013 3:54 PM LAST PLOTTED: 1 /28/2013 3:54 PM PLOTTED BY: Ron Will '..n.is OPTIONAL GABION INLET PROTECTION BOX (PATENT BY AUTRY GRADING CO.) FILENAME: G: \CURRENT JOBS \WEAVER FRANK \10 - 1224 -01 THE SUMMIT - SECTION FOUR\ PLANS \DETAILS \MASTER- DFTNLS.DWG Design settled top 2' PIPE OUTLET TO FLAT AREA - NO WELL - DEFINED CHANNEL PIPE OUTLET TO WELL- DEFINED CHANNEL 12" min. of NCOOT #5 or #57 washed stone 3600 CU. FT /ACRE 1 \ .l ry 1. a is the length of the riprop apron. 2. D =1.5 times the maximum stone diomei or but not less than 6 ". 3. In a well- defined channel extend the apron up the channel banks to an elevation of 6" above the maximum talwater depth of to the top of the bank. whichever is less. 4. A filtwr blanket or filter fabric should be in =tolled between the riprap and sell foundation. CON5M.VCIION SPECIFICATIONS 1. Eri that the subgrade for the fliter and riprop follows the required lines and wades shown In the plan. Compact any fill required In the subgrade to the density of the surrounding undisturbed material. Low areas in the subgrade on undisturbed soil may also be filled by increasing the riprop thickness 2. The riprop and gravel filter must conform to the specified grading limits shown an the plans. 3. Filter cloth, when used, must meet design requirements and be properly protected from punching a tearing during installation. Repair any damage by removing the riprop and placing another piece of filter Goth over the damaged area. All connecting joints should overlap so the top layer is above the downEtreom layer a minimum of 1 foot. if the damage is extensive, replace the entire filter cloth. 4. Riprop may be placed by equipment, but take care to avoid damaging the filter. 5. The minimum thickness of the riprap should be 1.5 times the maximum stone diameter. 6. Riprnp may be field stone or rough quarry stone. it should be hard, angukn; highly weather- resistant and well graded. 7. Gwshuct the opron on zero grade with no overall at the end. Make the top at the riprop at the downstream and level with the receiving area or slightly below d. S. Ensure that the opron is properly aligned with the receiving stream and preferably straight throughout its length. If a curve Is needed to fit site coridulons, place it in the upper section of the apron. 9. immwilately after construction, stabilize all disturbed areas with vegetation (Practices 6.10, Temporary Seeding, and 6.11, Permanent Seeding). MAINFCl Inspect r"ipluPP Outlet structures weekly and after significant (} inch or greater) rainfall avoids to see if any erosion around or below the riprop hoe taken place, a if stoup* hove been dislodged. Immediately make all needed repairs to prevent fu. Iher damage. RIP -RAP OUTLET PROTECTION NTS .� .:.fir. %,;• -::• CROSS SECTION NTS STONE SECTION NTS 5' MAX. FILTER FABRIC OVERFI 6' FOR SETTLEMENT 2:1 SIDE SLOPE MAX 7EX iST . . GRADE �1:1. SIDE SLOPE MAX CLASS B RIP RAP TEMPORARY SEDIMENT TRAP CONSTRUCTION SPECIFICATIONS 1. Clear, grub and strip the area under the embankment of all vegetation and root mat Remove all surface sail Containing high amounts of organic matter, and stockpile or dispose of it properly. Haul all objectionable material to the designated disposal area. 2. Ensure that fill material for the embankment is free of roots, woody vegetation, organic matter and other objectionable material. Place the fill in lifts act to exceed 9 inches, and machine compact it. Over fill the embankment 6 inches to allow for settlement 3. Constmet the outlet section in the embankment. Protect the Connection between the riprap and the soil from piping by using filter fabric or a keyway cutoff trench between the riprap structure and soil. -Place the filter fabric between the riprop and the soil. Extend the fabric across the spillway foundation and sides to the top of the dam; or .Excavate a keyway trench along the centerline of the spillway foundation extending up the sides to the height of the dam. The trench should be at least 2 feet deep and 2 feet wide with 1:1 side slopes. C Clear the pond area below the elevation of the crest of the spillway to facilitate sediment cleanout. 5. All cut and fill slopes should be 2:1 or flatter. 6. Ensure that the stone (drainage) section of the embankment has a minimum bottom width of 3 feet and maximum side slopes of 1:1 that extend to the bottom of the spillway section. 7. Construct the minimum finished stone spillway bottom width, as shown on the plans, with 2:1 side slopes extending to the top of the over filled embankment. Keep the thickness of the sides of the spillway outlet structure at a minimum of 21 inches. The weir must be level and constructed to grade to assure design Capability. 8. Material used in the stone section should be a well -graded mixture of stone with a d50 size of 9 inches (class B erosion control stone is rerommended) and a maximum stone size of 14 inches. The stone may be machine placed and the smaller stones worked into the voids of the larger stones. The stone should be hard, angular and highly weather- resistant 9. Discharge inlet water into the basin in a manner to prevent erosion. Use temporary slope drains or diversions with outlet protection to divert sediment -laden water to the upper end of the pool area to improve basins trap efficiency( References: Runoff Control Measures and Outlet Protection). 10. Ensure that the stone spillway outlet section extends downstream past the Ice of the embankment until stable conditions are reached and outlet velocity is acceptable for the receiving stream. Keep the edges of the stone outlet section flush with the surrounding ground, and shape the center to confine the outflow stream (References: Surface Stabilization) . 11. Direct emergency bypass to natural, stable areas. Locate bypass outlets so that flow will not damage the embankment. 12 Stabilize the embankment and all disturbed areas above the sediment pool and downstream from the trap immediately after construction (References: Surface Stabilization) . 13. Show the distance from the top of the spillway to the sediment cleanout level (1/2 the design depth) on the plans and mark it in the field. 14. Install porous baffles as specified in Practice 6.65, Porous Baffles . MAINTENANCE Inspect temporary sediment traps at least weekly and after each significant (U2 inch or greater) rainfall event and repair immediately. Remove sediment, and mstore the trap to its original dimensions when the sediment has accumulated to one -half the design depth of the trap. Place the sediment that is removed in the designated disposal area, and replace the part of the gravel facing that is impaired by sediment Check the structure for damage from erosion or piping. Periodically check the depth of the spillway to ensure it is a minimum of 1.5 feet below the low point of the embankment Immediately fill any settlement of the embankment to slightly above design grade. Any riprop displaced from the spillway must be replaced immediately. After all sediment - producing areas have been permanently stabilized, remove the structure and all unstable sediment Smooth the area to blend with the adjoining areas, and stabilize properly. (References: Surface Stabilization) TEMPORARY SEDIMENT TRAP N.T.S. BY -PASS 6" BELOW SETTLED TOP OF DAM Winter and Early Spring SEEDING MIXTURE SPECIES RATE (LBJACRE) Rye (grain) 120 Annual lespedeza (kobe in Piedmont and Coastal Plain, Korean in Mountains) 50 Omit annual lespedeza when duraton of temporary cover is not to extend beyond June. SEEDING DATES Mountains - -Above 2500 ft. Feb. 15 -May 15 Below 2500 ft. Feb. 1 -May 1 Piedmont- -Jan. 1 -May 1 Coastal Plain- -Dec. 1 -Apr. 15 SOIL AMENDMENTS Follow recommendations of soil tests or apply 2,000 Ib. /ocre ground agriculture limestone and 750 lb./acre 10 -10-10 fertilizer. MULCH Apply 4,000 lb. /acre straw. Anchor straw by tacking with asphalt, netting, or a mulch anchoring tool. A disk with blades set nearly straight can be used as a mulch anchoring tool. MAINTENANCE Refertilize if growth is not fully adequate. Reseed, refertilize and mulch Immediately following erosion or other damage. TEMPORARY SEEDING RECOMMENDATIONS (b) summer SEEDING MIXTRE SPEa ES RATE (LILIAME) German millet 40 In the Piedmont and Mountains, a small- stemmed Sudangross may by substituted at a rate of 50 Ib. /acre. SEEDING DATES Mountains- -May 15 -Aug. 15 Piedmont- -May 1 -Aug. 15 Coastal Plain- -Apr. 15 -Aug. 15 SOIL AMENDMENTS Follow recommendations of soil tests or apply 2,000 Ib. /ocre ground agriculture limestone and 750 lb. /acre 10 -10 -10 fertilizer. MULCH Apply 4,000 lb./acre straw. Anchor straw by tacking with asphalt, netting, or a mulch anchoring tool. A disk with blades set nearly straight can be used as a mulch anchoring tool. MAINTENANCE Refertiize if growth is not fully adequate. Reseed, refertilize and mulch immediately following erosion or other damage. 8' max. standard strength fabric with wire fence 6' max. extra the trenchy PLAN VIEW NTS Plastic "' Backfill trench or wire fence err and compact ties fabric thoroughly ground �n. �E�9��ll1��CtI�EE11ItIlT�.7bC��f ,.k.1•IA�3Y'15 TEMPORARY SEEDING RECOMMENDATIONS (a) Fall SEEDING MIXTURE RATE (LUJALRE) Rye (grain) 120 SEEDING DATES Mountains- -Aug. 15 -Dec. 15 Coastal Plain and piedmont - -Aug. 15 -Dec. 30 SOIL AMENDMENTS Follow soil tests or apply 2,000 lb./acre ground agricultural limestone and 1,000 lb. /acre 10 -10-10 fertilizer. Apply 4,OOD lb./acre straw. Anchor straw by tacking with asphalt, netting, or a mulch anchoring tool. A disk with blades set nearly straight can be used as a mulch anchoring toot. MAINTENANCE Repair and refertilize damaged areas immediately. Topdress with 50 lb./acre of nitrogen in march. If it is necessary to extend temporary cover beyond June 15, overseed with 50 lb./acre Kobe (Piedmont and Costal Plain) or koreon (Mountains) lespedza in late February or early March. NTe GAaaN To a QFANm (Figure 6.62a Installation detail of a sediment fence.) chlse�oln (3" width) As Nrmm To REMOVE STORE a01/PAanFD sILL EIO. device exerting 60 p.s.i. or GRAwe. Flom MM Yw ill.. Ll SIDE su1PE OPTIONAL GABION INLET PROTECTION BOX (PATENT BY AUTRY GRADING CO.) FILENAME: G: \CURRENT JOBS \WEAVER FRANK \10 - 1224 -01 THE SUMMIT - SECTION FOUR\ PLANS \DETAILS \MASTER- DFTNLS.DWG Design settled top 2' PIPE OUTLET TO FLAT AREA - NO WELL - DEFINED CHANNEL PIPE OUTLET TO WELL- DEFINED CHANNEL 12" min. of NCOOT #5 or #57 washed stone 3600 CU. FT /ACRE 1 \ .l ry 1. a is the length of the riprop apron. 2. D =1.5 times the maximum stone diomei or but not less than 6 ". 3. In a well- defined channel extend the apron up the channel banks to an elevation of 6" above the maximum talwater depth of to the top of the bank. whichever is less. 4. A filtwr blanket or filter fabric should be in =tolled between the riprap and sell foundation. CON5M.VCIION SPECIFICATIONS 1. Eri that the subgrade for the fliter and riprop follows the required lines and wades shown In the plan. Compact any fill required In the subgrade to the density of the surrounding undisturbed material. Low areas in the subgrade on undisturbed soil may also be filled by increasing the riprop thickness 2. The riprop and gravel filter must conform to the specified grading limits shown an the plans. 3. Filter cloth, when used, must meet design requirements and be properly protected from punching a tearing during installation. Repair any damage by removing the riprop and placing another piece of filter Goth over the damaged area. All connecting joints should overlap so the top layer is above the downEtreom layer a minimum of 1 foot. if the damage is extensive, replace the entire filter cloth. 4. Riprop may be placed by equipment, but take care to avoid damaging the filter. 5. The minimum thickness of the riprap should be 1.5 times the maximum stone diameter. 6. Riprnp may be field stone or rough quarry stone. it should be hard, angukn; highly weather- resistant and well graded. 7. Gwshuct the opron on zero grade with no overall at the end. Make the top at the riprop at the downstream and level with the receiving area or slightly below d. S. Ensure that the opron is properly aligned with the receiving stream and preferably straight throughout its length. If a curve Is needed to fit site coridulons, place it in the upper section of the apron. 9. immwilately after construction, stabilize all disturbed areas with vegetation (Practices 6.10, Temporary Seeding, and 6.11, Permanent Seeding). MAINFCl Inspect r"ipluPP Outlet structures weekly and after significant (} inch or greater) rainfall avoids to see if any erosion around or below the riprop hoe taken place, a if stoup* hove been dislodged. Immediately make all needed repairs to prevent fu. Iher damage. RIP -RAP OUTLET PROTECTION NTS .� .:.fir. %,;• -::• CROSS SECTION NTS STONE SECTION NTS 5' MAX. FILTER FABRIC OVERFI 6' FOR SETTLEMENT 2:1 SIDE SLOPE MAX 7EX iST . . GRADE �1:1. SIDE SLOPE MAX CLASS B RIP RAP TEMPORARY SEDIMENT TRAP CONSTRUCTION SPECIFICATIONS 1. Clear, grub and strip the area under the embankment of all vegetation and root mat Remove all surface sail Containing high amounts of organic matter, and stockpile or dispose of it properly. Haul all objectionable material to the designated disposal area. 2. Ensure that fill material for the embankment is free of roots, woody vegetation, organic matter and other objectionable material. Place the fill in lifts act to exceed 9 inches, and machine compact it. Over fill the embankment 6 inches to allow for settlement 3. Constmet the outlet section in the embankment. Protect the Connection between the riprap and the soil from piping by using filter fabric or a keyway cutoff trench between the riprap structure and soil. -Place the filter fabric between the riprop and the soil. Extend the fabric across the spillway foundation and sides to the top of the dam; or .Excavate a keyway trench along the centerline of the spillway foundation extending up the sides to the height of the dam. The trench should be at least 2 feet deep and 2 feet wide with 1:1 side slopes. C Clear the pond area below the elevation of the crest of the spillway to facilitate sediment cleanout. 5. All cut and fill slopes should be 2:1 or flatter. 6. Ensure that the stone (drainage) section of the embankment has a minimum bottom width of 3 feet and maximum side slopes of 1:1 that extend to the bottom of the spillway section. 7. Construct the minimum finished stone spillway bottom width, as shown on the plans, with 2:1 side slopes extending to the top of the over filled embankment. Keep the thickness of the sides of the spillway outlet structure at a minimum of 21 inches. The weir must be level and constructed to grade to assure design Capability. 8. Material used in the stone section should be a well -graded mixture of stone with a d50 size of 9 inches (class B erosion control stone is rerommended) and a maximum stone size of 14 inches. The stone may be machine placed and the smaller stones worked into the voids of the larger stones. The stone should be hard, angular and highly weather- resistant 9. Discharge inlet water into the basin in a manner to prevent erosion. Use temporary slope drains or diversions with outlet protection to divert sediment -laden water to the upper end of the pool area to improve basins trap efficiency( References: Runoff Control Measures and Outlet Protection). 10. Ensure that the stone spillway outlet section extends downstream past the Ice of the embankment until stable conditions are reached and outlet velocity is acceptable for the receiving stream. Keep the edges of the stone outlet section flush with the surrounding ground, and shape the center to confine the outflow stream (References: Surface Stabilization) . 11. Direct emergency bypass to natural, stable areas. Locate bypass outlets so that flow will not damage the embankment. 12 Stabilize the embankment and all disturbed areas above the sediment pool and downstream from the trap immediately after construction (References: Surface Stabilization) . 13. Show the distance from the top of the spillway to the sediment cleanout level (1/2 the design depth) on the plans and mark it in the field. 14. Install porous baffles as specified in Practice 6.65, Porous Baffles . MAINTENANCE Inspect temporary sediment traps at least weekly and after each significant (U2 inch or greater) rainfall event and repair immediately. Remove sediment, and mstore the trap to its original dimensions when the sediment has accumulated to one -half the design depth of the trap. Place the sediment that is removed in the designated disposal area, and replace the part of the gravel facing that is impaired by sediment Check the structure for damage from erosion or piping. Periodically check the depth of the spillway to ensure it is a minimum of 1.5 feet below the low point of the embankment Immediately fill any settlement of the embankment to slightly above design grade. Any riprop displaced from the spillway must be replaced immediately. After all sediment - producing areas have been permanently stabilized, remove the structure and all unstable sediment Smooth the area to blend with the adjoining areas, and stabilize properly. (References: Surface Stabilization) TEMPORARY SEDIMENT TRAP N.T.S. BY -PASS 6" BELOW SETTLED TOP OF DAM Winter and Early Spring SEEDING MIXTURE SPECIES RATE (LBJACRE) Rye (grain) 120 Annual lespedeza (kobe in Piedmont and Coastal Plain, Korean in Mountains) 50 Omit annual lespedeza when duraton of temporary cover is not to extend beyond June. SEEDING DATES Mountains - -Above 2500 ft. Feb. 15 -May 15 Below 2500 ft. Feb. 1 -May 1 Piedmont- -Jan. 1 -May 1 Coastal Plain- -Dec. 1 -Apr. 15 SOIL AMENDMENTS Follow recommendations of soil tests or apply 2,000 Ib. /ocre ground agriculture limestone and 750 lb./acre 10 -10-10 fertilizer. MULCH Apply 4,000 lb. /acre straw. Anchor straw by tacking with asphalt, netting, or a mulch anchoring tool. A disk with blades set nearly straight can be used as a mulch anchoring tool. MAINTENANCE Refertilize if growth is not fully adequate. Reseed, refertilize and mulch Immediately following erosion or other damage. TEMPORARY SEEDING RECOMMENDATIONS (b) summer SEEDING MIXTRE SPEa ES RATE (LILIAME) German millet 40 In the Piedmont and Mountains, a small- stemmed Sudangross may by substituted at a rate of 50 Ib. /acre. SEEDING DATES Mountains- -May 15 -Aug. 15 Piedmont- -May 1 -Aug. 15 Coastal Plain- -Apr. 15 -Aug. 15 SOIL AMENDMENTS Follow recommendations of soil tests or apply 2,000 Ib. /ocre ground agriculture limestone and 750 lb. /acre 10 -10 -10 fertilizer. MULCH Apply 4,000 lb./acre straw. Anchor straw by tacking with asphalt, netting, or a mulch anchoring tool. A disk with blades set nearly straight can be used as a mulch anchoring tool. MAINTENANCE Refertiize if growth is not fully adequate. Reseed, refertilize and mulch immediately following erosion or other damage. 8' max. standard strength fabric with wire fence 6' max. extra the trenchy PLAN VIEW NTS Plastic "' Backfill trench or wire fence err and compact ties fabric thoroughly ground �n. �E�9��ll1��CtI�EE11ItIlT�.7bC��f ,.k.1•IA�3Y'15 TEMPORARY SEEDING RECOMMENDATIONS (a) Fall SEEDING MIXTURE RATE (LUJALRE) Rye (grain) 120 SEEDING DATES Mountains- -Aug. 15 -Dec. 15 Coastal Plain and piedmont - -Aug. 15 -Dec. 30 SOIL AMENDMENTS Follow soil tests or apply 2,000 lb./acre ground agricultural limestone and 1,000 lb. /acre 10 -10-10 fertilizer. Apply 4,OOD lb./acre straw. Anchor straw by tacking with asphalt, netting, or a mulch anchoring tool. A disk with blades set nearly straight can be used as a mulch anchoring toot. MAINTENANCE Repair and refertilize damaged areas immediately. Topdress with 50 lb./acre of nitrogen in march. If it is necessary to extend temporary cover beyond June 15, overseed with 50 lb./acre Kobe (Piedmont and Costal Plain) or koreon (Mountains) lespedza in late February or early March. No more than 24" of a 36" fabric is allowed above ground. Top of Fabric Belt top W Li ATTACHMENT DETAILS: Gather fabric at posts, if needed. Utilize three ties per post, all within top 8" of fabric. Position each tie diagonally, puncturing holes vertically a minimum of 1' apart. • Hang each tie on a post nipple and tighten securely. Use cable ties (501bs) or soft wire. e' ItY CROSS - SECTION VIEW �uu��LLqq�� NTS Horl'zonta Drive over each side of silt (Figure 6.62a Installation detail of a sediment fence.) chlse�oln (3" width) fence 2 to 4 times with Vibratory plow is not acceptable because device exerting 60 p.s.i. or of horizontal compaction NTS greater CONSTRUCTION SPECIFICATIONS Ponding height MATERIALS Instead of excavationg a trench, placing fabric and then backfilling trench, max. 24" POST SPACING: polyester, which is certified by the manufacturer or supplier as conforming to Attach fabric 6' max. on open runs or to upstream side of post 4' max. on pooling areas as middle of the fence. Check with a level if necessary. Synthetic filter fabric should contain ultraviolet ray inhibitors and stabilizers 2, Install posts 4 feet apart in critical areas and 6 feet apart on standard FLOW applications. temperature range of 0 to 120° F. STEEL POST DEPTH: tonal a minimum length of 5 feet. Make sure that steel posts have projections to 2 feet Dund a.M 3. For reinforcement of standard strength filter fabric, use wire fence with a No more than 24" of a 36" fabric is allowed above ground. Top of Fabric Belt top W Li ATTACHMENT DETAILS: Gather fabric at posts, if needed. Utilize three ties per post, all within top 8" of fabric. Position each tie diagonally, puncturing holes vertically a minimum of 1' apart. • Hang each tie on a post nipple and tighten securely. Use cable ties (501bs) or soft wire. e' ItY CROSS - SECTION VIEW �uu��LLqq�� NTS Horl'zonta I Completed Slicing blade Installation (Figure 6.62a Installation detail of a sediment fence.) chlse�oln (3" width) width) SEWMENTFENCE Vibratory plow is not acceptable because M 1V of horizontal compaction NTS CONSTRUCTION SPECIFICATIONS SEDIMENT FENCE INSTALLATION USING THE SLICING METHOD MATERIALS Instead of excavationg a trench, placing fabric and then backfilling trench, 1. Use a synthetic filter fabric of at least 95% by weigh of polyolefirls or sediment fence mayh be installed using specially designed equipment that polyester, which is certified by the manufacturer or supplier as conforming to inserts the fabric into a cut sliced in the ground with a disc (Figure 6.62b). the requirements in ASTM D 6461, which is shown in part in Table 6.62b INSTALLATION SPECIFICATIONS (Refer to the Erosion and Sediment Control Planning and Design Manual, 1. The base of both end posts should be at least one foot higher than the Chapter 6, Section 622). middle of the fence. Check with a level if necessary. Synthetic filter fabric should contain ultraviolet ray inhibitors and stabilizers 2, Install posts 4 feet apart in critical areas and 6 feet apart on standard to provide a minimum of 6 months of expected usable construction life at a applications. temperature range of 0 to 120° F. 2. Ensure that posts for sediment fences are 1.331611inear ft steel with 3. Install posts 2 feet deep on the downstream side of the sift fence, and a minimum length of 5 feet. Make sure that steel posts have projections to a$ close as possible to the fabric, enabling posts to support the fabric from facilitate fastening the fabric. upstream water pressure. 3. For reinforcement of standard strength filter fabric, use wire fence with a 4. Install posts with the nipples facing away from the sift fabric. minimum 14 gauge and a maximum mesh spacing of 6 inches. 5. Attach the fabric to each post with three ties, all spaced within the top 8 CONSTRUCTION inches of the fabric. Attach each tie diagonally 45 degrees through the fabric, 1. Construct the sediment barrier of standard strength or extra strength with each puncture at least 1 inch vertically apart. Also, each tie should be synthetic filter fabrics. positioned to hang on a post nipple when tightened to prevent sagging. 2. Ensure that the height of the sediment fence does not exceed 24 incites 6. Wrap approximately 6 inches of fabric around the end posts and secure above the ground surface. (Higher fences may impound volumes of water with 3 ties. sufficient to cause failure of the structure.) 7. No more than 24 inches of a 36 inch fabric is allowed above ground 3. Construct the filter fabric from a continuous roll cut to the length of the level. barrier to avoid joints. When joints are necessary, securely fasten the filter 8. The installation should be checked and corrected for any deviations before cloth only at a support post with 4 feet minimum overlap to the next post. compaction. 4. Support standard strength filter fabric by wire mesh fastened securely to 9. Compaction is vitally important for effective results. Compact the soil the upslope side of the posts. Extend the wire mesh support to the bottom of immediately next to the silt fence fabric with the front wheel of the tractor, the trench. Fasten the wire reinforcement, then fabric on the upslope side of skid steer, or roller exerting at least 60 pounds per square inch. Compact the the fence post. Wire or plastic zip ties should have minimum 50 pound tensile upstream side first, and then each side twice for a total of 4 trips. strength. 5. When a wire mesh support fence is used, space posts a maximum of 8feet MAINTENANCE Inspect sediment fences at least once a week and after each rainfall. Make any apart. Support posts should be driven securely into the ground a minimum of required repairs immediately. 24 inches. 6. Extra strength filter fabric with 6 feet post spacing does not require wire Should the fabric of a sediment fence collapse, tear, decompose or become mesh support fence. Securely fasten the fitter fabric directly to posts. Wire or ineffective, replace it promptly. plastic zip ties should have minimum 50 pound tensile strength. Remove sediment deposits as necessary to provide adequate storage volume de 7 . Excavate a trench approximately 4 inches wide and 8 inches deep along approximately for the next rain and to reduce pressure on the fence. Take care to avoid the proposed line of posts and from the barrier (Figure x). undermining the fence during cleanout. 8. Place 12 inches of the fabric along the bottom and side of the trench. Remove all fencing materials and unstable sediment deposits and bribe the area to grade and stabilize it after the contributing drainage area has been 9. Backfll the trench with soil placed over the filter fabric and compact. properly stabilized. Thorough compaction of the backfili is critical to silt fence performance. RECORD DOCUMENTS 10. Do not attach filter fabric to existing trees. The water utilities have been based on information provided by others. The design professional has not verified the accuracy /completeness of this information and shall not be responsible for any errors or omissions, which may be DRAWN BY: RSW / CCB CHECKED: JMK, JR. REVIEWED: JMK, JR. DATE: AUGUST 2012 O LL Z C-) -I _O In I- Z W O J W >- o IE -r W 0 Q._ O w D- t i 5 d � G � w > 'D^ V/ W 2 I_ w M O 3p in CC CC Z5 0 U y O 2 Lo to w j cr O Q O Z II il4rrrirrXX r� .a -�N US °UST 1 J OeQ U: sS oIse--112; 11 tY11NN````x` r F SCALE LCi O 1 "-00' VERT. W M 1V 6916 SHEET i- Z 14 O O i° w 1 LL.JMtnu- 0_'LO q M Z co O _O ° ' V r- U_CL -J r F SCALE HOR. 1 "-00' VERT. 1 "4 BOOK NO. 6916 SHEET 6 OF 14