21 EROSION CONTROL
21-1 General
21-1.01 General
Section 21 -1 includes general specifications for applying permanent erosion control measures.
21-1.02 Materials
Not Used
21-1.03 Construc Tion
Not Used
21-1.04 Payment
Not Used
21-2 Erosion Control Work
21-2.01 General
21-2.01A Summary
Section 21 -2 includes specifications for applying permanent erosion control measures to the soil surface. Move -in/move -out for erosion control includes (1) moving onto the project when the Engineer determines an area is ready to receive erosion control materials, (2) setting up all required personnel and equipment, and (3) moving out all personnel and equipmen t when work in that area is complete.
21-2.01B Definitions
percent total viability : The sum of the percent germination, percent hard seed, and percent dormant seed.
21-2.01C Submittals
21-2.01C(1) General
Submit a certificate of compliance for straw, fi ber, RECP, and fasteners before application. If weed -free straw is used, the certificate of compliance must include the certificate of quarantine compliance. Submit records for hydraulically applied erosion control materials that indicate (1) compliance wi th the specified application rates, (2) areas treated and quantity of materials applied, and (3) application date and time.
21-2.01C(2) Compost
Submit the compost producer's Compost Technical Data Sheet including test results and seal of testing assurance certificate with the compost sample. Submit a current Compost Technical Data Sheet with each compost delivery as required . Compost Technical Data Sheets must not be older than 90 days. Submit a 1 cu ft compost sample from the compost producer . Obtain authorization before delivering the compost to the job site.
21-2.01C(3) Seed
At least 60 days before seed application, submit proof that the purchase order for seed required for the Contra ct has been placed and accepted by the seed vendor. Include the seed's botanical names, quantity ordered, and the anticipated date of delivery on the purchase order . Submit a copy of the supplier's seed analysis report and seed label for each seed species before application. Seed analysis report must show:
1.Seed variety including botanical name and common name
2.Percent pure live seed
3.Percent by weight inert matter
4.Percent by weight other crop seed SECTION 21 EROSION CONTROL
5.Percent by weight weed seed
6.Name of restrict ed noxious weed seed by number per pound of seed
7.Germination test results
8.Name and address of the supplier or grower
9.Name and address of the seed laboratory
10.Date of the analysis Seed labels must show:
1.Seed variety including botanical name and common name
2.Lot number or other lot identification
3.Origin
4.Net weight
5.Percent pure live seed
6.Percent total viability
7.Percent by weight inert matter
8.Percent by weight other crop seed
9.Percent by weight weed seed
10.Name of restricted noxious weed seed by number per pound of seed
11.Name and address of the supplier or grower
12.Date the seed was labeled
21-2.01C(4) Tackifier
Submit a certificate of compliance for tackifier and bo nded fiber matrix at least 5 business days before application. Certificates of compliance must include:
1.SDS
2.Product label
3.List of applicable nonvisible pollutant indicators for soil amendment and stabilization materials as shown in the table title d "Pollutant Testing Guidance Table" in the Department's Construction Site Monitoring Program Guidance Manual . For the manual, go to the Department's Division of Construction website
4.Report of acute and chronic toxicity tests on aquatic organisms comply ing with EPA methods
5.List of ingredients, including chemical formulation
6.Properties of polyacrylamide in tackifier including: 6.1. Percent purity by weight 6.2. Percent active content 6.3. Average molecular weight 6.4. Charge density
21-2.01C(5) Fiber Reinforced Matrix
At least 7 days prior to purchase of fiber reinforced matrix submit:
1.Manufacturer information : 1.1. Name 1.2. Address 1.3. Telephone number 1.4. E-mail address 1.5. Website
2.Product label
3.Certification of compliance After application of fiber reinforced matrix, submit a document that indicate s:
1.Compliance with the specified application rates
2.Areas treated, and quantity of material applied
3.Application date and time SECTION 21 EROSION CONTROL
21-2.01D Quali ty Assurance
21-2.01D(1) General
Reserved
21-2.01D(2) Compost
Compost producers must be permitted by the Department of Resources Recycling and Recovery , Local Enforcement Agencies, and any other State and local a gencies that regulate solid waste plants . If exempt from State permitting provisions, the composting plant must certify it complies with the guidelines and procedures for production of compost under 14 CA Code of Regs § 17868. Compost producers must be par ticipants in the United States Composting Council's seal of testing assurance program.
21-2.01D(3) Seed
Seed must be tested for purity and germination by a seed laboratory certified by the Association of Official Seed Analysts or by a seed technologist certified by the Society of Commercial Seed Technologists. Seed test must be performed for germination within 12 months before application.
21-2.02 Materials
21-2.02A General
Water must be of a quality that pro motes germination of seeds and growth of plants .
21-2.02B Duff
Duff must consist of vegetation removed and collected from clearing and grubbing activities. Vegetation may include t rees, shrubs, ground cover, grasses, bark, leaves, and roots with attached soil. Process vegetation into duff by tub grinding or chipping it into pieces not exceeding 6 inches in any dimension. Stockpile duff until work area to receive duff is complete. Du ff stockpiles must not exceed 5 feet in height. Duff stockpiles must n ot be covered with a material that will stop air circulation, increase duff pile temperatures , or harm beneficial biological activity and resident seeds.
21-2.02C Imported Topsoil
Impor ted topsoil must:
1.Consist of fertile, friable soil of loamy character with a pH range from 6 to 7 that contains organic matter in quantities natural to the region and capable of sustaining healthy plan t life
2.Be free from deleterious substances such as litter, refuse, toxic waste, stones larger than 1 inch in size, coarse sand, heavy or stiff clay, brush, sticks, grasses, roots, noxious weed seed, weeds, and other substances detrimental to plant, anim al, and human health
21-2.02D Fiber
Fiber must be wood fiber, cellulose fiber, alternate fiber, or a combination of these fibers. Wood fiber must be a long -strand, whole -wood fiber thermo mechanically processed from clean whole wood chips. Cellulose fiber must be made from natural or recycled pulp fiber, such as wood chips, sawdust, newsprint, chipboard, corrugated cardboard, or a combination of these materials. Alternate fiber must be a long strand, wh ole natural fiber made from clean straw, cotton, corn, or other natural feed stock. Fiber must:
1.Disperse into a uniform slurry when mixed with water.
2.Contain 3/8 -inch fiber strands for at least 25 percent by total volume.
3.Have at least 40 percent retained when passed through a no. 25 sieve.
4.Have an initial moisture content of no more than 15 percent of its dry weight when tested under California Test 226. The moisture content must be marked on the packaging. SECTION 21 EROSION CONTROL
5.Have a water holding capacity, by weight, of at least 1,200 percent when tested under ASTM D7367.
6.Be nontoxic to plants and animal life.
7.Be free of synthetic or plastic materials, lead paint, printing ink, varnish, petroleum products, seed germination inhibitors, and chlorine bleach.
8.Contain less than 250 ppm of boron.
9.Be colored to contrast with the area where it is to be applied. The coloring agent must be biodegradable, nontoxic, and free from copper, mercury, and arsenic, and must not stain concrete or painted surface s.
21-2.02E Tackifier
Tackifier must be (1) free from growth or germination inhibiting factors, (2) nonflammable, (3) nontoxic to aquatic organisms, and (4) functional for a minimum of 180 days. Tackifier must be one of the following:
1.Plant based natural high -molecular -weight polysaccharide. Plant -based tackifier must be a high viscosity hydrocolloid that is miscible in water, and labeled as either guar, psyllium, or starch, as follows: 1.1. Guar gum based t ackifier must be derived from the ground endosperm of the guar plant, Cyanmopsis tetragonolobus . It must be treated with dispersing agents for easy mixing. It must be able to be diluted at the rate of 1 to 5 pounds per 100 gallons of water. 1.2. Psyllium b ased tackifier must be manufactured from the finely ground, mucilloid coating of Plantago ovata or Plantago ispaghula seeds and able to dry and form a firm but rewettable membrane. 1.3. Starch based tackifier must be a nonionic, water -soluble, granular mat erial derived from corn, potato, or other plant -based source.
2.Prepackaged liquid or dry powder polymeric emulsion blend. Prepackaged tackifier must be an anionic formulation with a residual monomer content not exceeding 0.05 percent by weight. The tackifier must contain and be labeled with one of the following as the primary active ingredients: 2.1. Acrylic copolymers and polymers . 2.2. Polymers of methacrylates and acrylates . 2.3. Copolymers of sodium acrylates and acrylamides . 2.4. Polyacrylamide and c opolymer of acrylamide . 2.5. Hydrocolloid polymers .
21-2.02F Seed
Seed must not contain:
1.Prohibited noxious weed seed
2.More than 1.0 percent total weed seed by weight Seed with a germination rate lower than t he minimum rate shown may be used if authorized. Deliver seed to the job site in unopened, separate containers with the seed tag attached. Measure individual seed species and mix in the presence of the Engineer.
21-2.02G Fertilizer
Fertilizer must comply with the material specifications for fertilizer in section 20 -3.01B(4).
21-2.02H Straw
Straw must be stalks from wheat, rice, or barley furnished in air -dry condition with a consistency compatible for application with commercial straw -blowing equipment. Wheat and barley straw must be derived from irrigated crops. Straw must be free of plastic, glass, metal, rocks, and refuse or other deleterious material. Straw must not have been used for stable bedding.
21-2.02I Mycorrhizae Inoculant
Mycorrhizae inoculant must comply with section 20 -3.01B(5). SECTION 21 EROSION CONTROL
21-2.02J Bonded Fiber Matrix
Bonded fiber matrix must be a hydraulically -applied material composed of fiber and tac kifier and may also include seed and fertilizer as shown. Fiber for bonded fiber matrix must be 100 percent wood fiber and comply with the specifications for fiber under section 21 -2.02D, except that at least 50 percent is retained when passed through a no . 25 sieve. Tackifier for bonded fiber matrix must:
1.Be bonded to the fiber or prepackaged with the fiber by the manufacturer
2.Contain a minimum of 10 percent of the combined weight of th e dry fiber, activating agents, and additives
3.Be an organic, high viscosity colloidal polysaccharide with activating agents or a blended hydrocolloid -based binder
21-2.02K Compost
Compost must be derived from one or a combination of the following type s of materials:
1.Green material consisting of chipped, shredded, or ground vegetation or clean, processed, recycled wood products
2.Biosolids
3.Manure
4.Mixed food waste The materials listed above may be processed separately and then combined to meet the compost quality characteristics and gradations specified. Compost must not be derived from mixed municipal solid waste and must not contain paint, petroleum products, pesticides, or other chemical residues harmful to plant or animal life. Metal concen trations in compost must not exceed the maximum listed under 14 CA Code of Regs § 17868.2. Process compost materials under 14 CA Code of Regs § 17868.3. SECTION 21 EROSION CONTROL The quality characteristics of compost must have the values shown in the following table: Compost Quality characteristic Test methoda Requirement Fine Medium Coarse pH TMECC 04.11 -A 6.0–8.5 6.0–8.5 5.0–8.5 Soluble salts (dS/m) TMECC 04.10 -A 0–10 0–10 0–10 Moisture content (% wet weight) TMECC 03.09 -A 25–60 25–60 < 60 Organic matter content (% dry weight) TMECC 05.07 -A 30–70 30–100 25–100 Maturity (seed emergence) (% relative to positive control) TMECC 05.05 -A 80 or above 80 or above N/A Maturity (seedling vigor) (% relative to positive control) TMECC 05.05 -A 80 or above 80 or above N/A Stability (mg CO 2-C/g OM per day) TMECC 05.08 -B 5 or below 8 or below 8 or below Pathogen Salmonella (most probable number per 4 grams dry weight basis) TMECC 07.01 -B < 3 < 3 < 3 Pathogen Fecal coliform (most probable number per gram dry weight basis) TMECC 07.01 -B < 1,000 < 1,000 < 1,000 Physical contaminants (% dry weight) Plastic, glass, and metal TMECC 02.02 -C Combined total: < 0.5 Combined total: < 0.5 Combined total: < 0.5 Film plastic (% dry weight) TMECC 02.02 -C Combined total: < 0.1 Combined total: < 0.1 Combined total: < 0.1 aTMECC refers to Test Methods for the Examination of Composting and Compost , published by the United States Department of Agriculture and the United States Compost Council (USCC).
21-2.02L 21-2.02N Reserved
21-2.02O Rolled Erosion Control Products
21-2.02O(1) General
RECP must be a long-term, degradable, o pen-weave textile manufactured or fabricated into rolls designed to reduce soil erosion and assist in the growth, establishment, and protection of vegetat ion. RECP must conform to the classification system established by the ECTC. Deliver RECP in suitable wrapping to protect against moisture and extended ultraviolet exposure occurring before placement.
21-2.02O(2) Jute Mesh
Jute mesh must be ECTC Type 3B made of unbleached and undyed woven jute. Jute mesh must comply with the requirements shown in the following table: Jute Mesh Quality characteristic Test method Requirement Strands per foot (min, in each direction) -- 14–20 Roll width (min, inches) -- 48 USLE C -Factor for a 1.5:1 (H:V) unvegetated slope -- ≤ 0.25 Shear stress (max, psf) ASTM D6460 2.0 Tensile strength (min, psf) ASTM D5035 100 Functional longevity (months) -- 12 Average open area (%) -- 65 ± 5 Weight of fabric (min, oz/sq yd) ASTM D3776 14.4–19.2 SECTION 21 EROSION CONTROL
21-2.02O(3) Netting
Netting must be ECTC Type 4 and made of 100 percent coconut fiber woven into a matrix. Netting must comply with the requirements shown in the following table: Netting Quality characteristic Test method Requirement Type A Type B Type C Thickness (min, inch) ASTM D6525 0.30 Roll width (min, inches) -- 72–158 USLE C -Factor for a 1:1 (H:V) unvegetated slope -- ≤ 0.25 Shear stress (max, psf) ASTM D6460 2.25 4.4 4.6 Tensile strength (min, psf) ASTM D5035 125 Functional longevity (months) -- 36 Average open area (%) -- 63 ± 5 48 ± 5 38 ± 5 Weight of fabric (min, oz/sq yd) ASTM D3776 11.8 20 26
21-2.02O(4) Erosion Control Blankets
Erosion control blanket must be ECTC Type 2D and made of processed natural fibers that are mechanically, structurally, or chemically bound together to form a continuous matrix that is surrounded by 2 nat ural nets. Erosion control blanket must comply with the requirements shown in the following table: Erosion Control Blanket Quality characteristic Test method Requirement Type A Type B Type C Roll width (min, inches) -- 72 Matrix (%) : Straw/coconut Woven coir (coconut fiber) Wood excelsior (6 inches or longer) --70/30 -- ---- ---- -- USLE C -Factor for a 1:1 (H:V) unvegetated slope -- ≤ 0.20 Shear stress (max, psf) ASTM D6460 1.75 Tensile strength (min, psf) ASTM D5035 75 Functional longevity (months) -- 12
21-2.02O(5) Turf Reinforcement Mats
Turf reinforcement mat must be ECTC Type 5 and nondegradable, open -weave textile made of synthetic fibers, filaments, nets, wire mesh or other elements, processed into a permanent, 3 -dime nsional matrix. Turf reinforcement mat must comply with the requirements shown in the following table: Turf Reinforcement Mat Quality characteristic Test method Requirement Type A Type B Type C Roll width (min, inches) -- 72 Thickness (min, inches) ASTM D6525 0.25 USLE C -Factor for a 1:1 (H:V) unvegetated slope -- ≤ 0.25 Shear stress (max, psf) ASTM D6460 6 8.4 10 Tensile strength (min, psf) ASTM D5035 125 150 175 Functional longevity (months) -- 36 UV stability (% at 500 hrs) ASTM D4355 80 SECTION 21 EROSION CONTROL
21-2.02P Fiber Rolls
Fiber roll must be a premanufactured roll filled with rice or wheat straw, rice hull, wood excelsior , cotton , or coconut fiber. Fiber roll filling must be free of plastic, glass, metals, rocks and refuse or other deleterious material. Straw must not have been used for stable bedding. Fiber roll must be covered with biodegradable jute, sisal , wood fiber, cotton , or coir fiber netting secured tightly at each end and m ust be one of the following:
1.8 to 10 inches in diameter and at least 1.1 lb/ft
2.10 to 12 inches in diameter and at least 3 lb/ft Fiber roll must have a minimum functional longevity of 1 year.
21-2.02Q Compost Socks
Compost used to fill mesh tubing must comply with the quality characteristics for co arse compost under section 21 -2.02K.
21-2.02R Fasteners
Wood stakes must be untreated fir, redwood, cedar, or pine and cut from sound timber. The ends must be pointed for driving into the ground. Notched stakes must be at least 1 by 2 by 24 inches in size. Stakes without notches must be at least 1 by 1 by 24 inches. Metal stakes must be at least 1/2 inch in diameter and have tops bent at 90 -degree angles or cappe d with an orange or red plastic safety cap that fits snugly onto the metal stake. Steel staples must be a minimum of 11 -gauge, 6 -inch, U -shaped staples with a 1 -inch crown. Provide heavier gauge and greater length if required by the job site conditions. Yo u may use an alternative attachment device such as a 100 percent biodegradable fastener to install RECP instead of staples. Rope to fasten fiber rolls must be 1/4 inch in diameter and b iodegradable, such as sisal or manila.
21-2.02S 21-2.02V Reserved
21-2.03 Construction
21-2.03A General
The Engineer designates the extent of erosion control areas by directing the placement of stakes or other suitable markers in increments of 1 acre or less. Furnish tools, labor, materials, and transportation required to mark areas receiving erosion control treatments. Before applying erosion control materials, verify that finished grades comply with the specifications for grade, compaction, and finish in section 19. Remove and dispose of trash, debris, and weeds in areas to receive erosion control materials. Remove and dispose of loose rocks larger than 2 -1/2 inches in maximum dimension unless otherwise authorized. Protect the traveled way, sidewalks, lin ed drainage channels, and existing vegetation from overspray of hydraulically -applied material. Apply erosion control materials within 24 hours after the final preparation of the erosion control areas. Do not apply hydraulically applied materials if :
1.Precipitation occurs
2.Water is standing on or moving across the soil surface
3.Soil is frozen
4.Air temperature is below 40 degrees F during the tackifier curing period unless allowed by the tackifier manufacturer and authorized SECTION 21 EROSION CONTROL
21-2.03B Duff
Upon comp letion of the earthwork in an area, spread duff to a uniform thickness. Apply duff to the edge of the shoulder backing. When shoulder backing is absent, do not apply duff within 3 feet of the edge of pavement. Trackwalk duff with tracked equipment run perpendicular to slope contours. Water may be used to assist this process but must not cause erosion.
21-2.03C Imported Topsoil
Place imported topsoil after all other earthwork in an area is complete. Spread imported topsoil to a uniform thickness . Trackwalk imported topsoil with tracked equipment run perpendicular to slope contours. Water may be used to assist the process but must not cause erosion.
21-2.03D Hydromulch and Hydroseed
Apply hydromulch with hydraulic spray equipment that mixes fiber, tackifier, fertilizer, and other erosion control materials specified. If applying hydroseed, add seed to hydromulch. Seed may be dry applied to small areas not accessible by hydroseeding equipment if author ized. Add water to hydromulch and hydroseed materials as recommended by the manufacturer and mix sufficiently to ensure an even application. A dispersing agent may be added to the mixture if authorized. Equipment must have a built -in continuous agitation a nd discharge system capable of producing a homogeneous mixture and a uniform application rate. The tank must have a minimum capacity of 1,000 gallons. You may use a smaller tank if authorized. Apply materials in locations, rates, and number of applications shown and as follows:
1.Start application within 60 minutes after adding seed to the tank.
2.Apply in successive passes as necessary to achieve the specified application rate.
3.Apply all hydromulch or hydroseed materials shown for a single area within 72 hours. If hydromulch or hydroseed materials are applied to areas covered by RECP, apply hydromulch and hydroseed materials to the rolled product as follows:
1.Verify the RECP is in uniform contact with the slope surface.
2.Spray materials into the RECP perpendicular to the slope and integrate well.
3.Do not displace or damage the RECP. After the final application, do not allow pedestrians or equipment on the treated areas.
21-2.03E Dry Seed
Apply dry seed and fertilizer at the rates shown after job site preparation. Scarify areas to a minimum depth of 1 inch. Apply and incorporate materials into the soil to a maximum depth of 1/4 inch by dragging or raking.
21-2.03F Drill Seed
Drill-seeding equipment must be a rangeland drill seeder with a ring roller attached. The seeder must be equipped with a fluffy seed box with agitators to prevent bridging and clogging. The seed box must have metal row dividers and individual box adjustments to meter the seed flow. Apply drill seed as follows:
1.Drill seed in rows no greater than 8 inches apart and to a depth of 1/4 inch.
2.Make a minimum of 2 passes in different directions with seeding equipment to reduce any uniform row appearance. Apply seed to the edge of the shoulder backing. When shoulder backing is absent, do not apply seed within 3 feet of the edge of pavement. SECTION 21 EROSION CONTROL
21-2.03G Straw
Apply straw by spreading it unifo rmly without clumping or piling at the rates shown, based on slope measurements. Once straw work is started in an area, apply all materials for that area in the same work shift.
21-2.03H Bonded Fiber Matrix
Apply bonded fiber matrix materials in the locations, rates, and number of applications shown and as follows:
1.Apply in successive passes as necessary to achieve the specified application rate.
2.Form a continuous uniform mat with no gaps betwe en the mat and the soil surface as follows: 2.1. Apply in 2 or more directions if necessary. 2.2. Apply in layers as necessary to avoid slumping and aid drying.
21-2.03I Compost
Apply compost to a uniform thickness in the locations shown. If compost and seed are applied simultaneously, mix and apply together with equipment suitable for the application such as a pneumatic blower truck. Apply compost to the edge of the shoulder backing. When shoulder backing is absent, do not apply compost within 3 feet of the edge of pavement.
21-2.03J Incorporate Materials
Incorporate topsoil, duff, compost, and mulch to the depth shown until well mixed. Materials may be mixed together before incorporation if authorized. Do not incorporate materials within 3 feet of the pavement edge. Incorporate straw with a roller made of approximately 7/8 -inch steel plate equipped with straight studs placed approximately 8 inches apart and staggered. Studs must not be less than 6 inches long nor more than 6 inches wide and must be rounded to prevent the straw withdrawing from the soil. The roller weight must be sufficient t o incorporate the straw into the soil to a depth that will not support combustion and result in a uniform surface.
21-2.03K Fiber Reinforced Matrix
Apply fiber reinforced matrix with hydraulic spray equipme nt. Add water to fiber reinforced matrix as recommended by the manufacturer and mix sufficiently to ensure an even application. A dispersing agent may be added to the mixture if authorized. Equipment must have a built -in continuous agitation and discharge system capable of producing a homogeneous mixture and uniform application rate. The tank must have a minimum capacity of 1,000 gallons. You may use a smaller tank if authorized. Apply fiber reinforced matrix in the locations and at the rates shown and as f ollows:
1.Apply in successive passes as necessary to achieve the specified application rate .
2.Form a continuous uniform mat as follows: 2.1. Apply in 2 or more directions if necessary . 2.2. Apply in layers as necessary to avoid slumping and aid drying .
3.Start application within 60 minutes after adding seed to the tank . After final application, do not allow pedestrians or equipment on the treated areas.
21-2.03L 21-2.03N Reserved
21-2.03O Rolled Erosion Control Products
Before placing RECP , ensure the subgrade has been graded smooth and has no depressed voids. The subgrade must be free from obstructions, such as tree roots, projecting stones, or foreign matter greater than 1 inch in diameter . Fasten RECP to the surface with staples and anchor as shown. Do not drive vehicles on RECP. SECTION 21 EROSION CONTROL
21-2.03P Fiber Rolls
Before installing fiber roll remove obstructions from the ground, including rocks, clods, and debris greater than 1 inch in diameter. Install fiber roll approximately parallel to the slope contour. For any 20 -foot section of fiber roll, prevent the fiber roll from varying more than 5 percent from level. Install fiber roll on slopes at th e following spacing unless shown otherwise:
1.10 feet apart for slopes steeper than 2:1 (horizontal:vertical)
2.15 feet apart for slopes from 2:1 to 4:1 (horizontal:vertical)
3.20 feet apart for slopes from 4:1 to 10:1 (horizontal:vertical)
4.50 feet apart for slopes flatter than 10:1 (horizontal:vertical) Type 1 fiber roll installation consists of placing and fastening as follows:
1.Place in a furrow that is from 2 to 4 inches deep.
2.Fasten with wood stakes every 4 feet along the length of the fiber roll.
3.Fasten the ends of the fiber roll by placing a stake 6 inches from the end of the roll.
4.Drive the stakes into the soil so the top of the stake is less than 2 inches above the top of the fiber roll. Type 2 fiber roll installation consists of placing and fastening as follows:
1.Fasten with notched wood stakes and rope.
2.Drive stakes into the soil until the notch is even with the top of the fiber roll.
3.Lace the rope between stakes and over the fiber roll. Knot the rope at each stake.
4.Tighten the fiber roll to the surface of the slope by driving the stakes further into the soil. If soil conditions do not allow driving stakes into the soil, drill pilot holes to facilitate driving of the stakes. Maintain fiber roll in a way that provides sediment holding capacity and reduces runoff velocities as follows:
1.Remove sediment from behind the fiber roll if sediment is 1/3 of fiber roll height above ground.
2.Repair or adjust the fiber roll if rills or o ther evidence of concentrated runoff occur beneath the fiber roll.
3.Repair or replace the fiber roll if they become split, torn, or unraveled.
4.Add stakes if the fiber roll slumps or sags.
5.Replace broken or split wood stakes.
6.Remove sediment depo sits, trash, and d ebris from fiber roll as needed . If removed sediment is deposited within project limits, it must be stabilized and not exposed to erosion by wind or water.
21-2.03Q Compost Socks
Before installing compost sock , remove obstructions from the ground including rocks, clods, and debris greater than 1 inch in diameter. Install and maintain compost sock under the specifications for fiber rolls in section 21 -2.03P and t he following requirements :
1.Place mesh tube, secure the end, and fill uniformly with compost. Secure the remaining end.
2.Secure compost sock to soil surface with Type 1 installation. Do not construct a furrow.
3.Remove sock and stakes if ordered . Cut sock and empty contents in place. This work is change order work.
21-2.03R 21-2.03T Reserved
21-2.04 Payment
The payment quantity for bid items paid for by area is the area measured parallel to the ground surface except overlaps , embedment , and key tren ches . The payment quantity for bid items paid for by length is the length measured parallel to the ground surface except overlaps . SECTION 21 EROSION CONTROL The payment quantity for bid items paid for by volume is th e volume measured in the vehicle at the point of delivery. A move -in followed by a move -out counts as 1 measurement unit. The Department does not adjust the unit price for an increase or decrease in the move -in/move -out quantity.
21-3 Permanent Erosion Co Ntrol Establishment Work
Reserved
Source: California Standard Specifications, 2024 Edition. Pages 375–386 of 1,372.