867COMPOST FILTER SOCK

867.1DESCRIPTION—This work is furnishing, placement , and maintenance of a compost filter sock

erosion and sedimentation pollution control system.

867.2MATERIAL—

food, stump grindings, and yard or wood/bark organic matter sources – aerobically composted with no objectionable odors. The compost product should not resemble the raw material from which it was derived. Wood and bark chips, ground construction debris, or reprocessed wood products are not acceptable as the organic component of the mix. Provide compost meeting the compost standards for compost filter socks contained in the DEP Erosion and Sediment Pollution Control Program Manual:

• Moisture content, dry weight basis

30% - 60% • pH

5.5 - 8.5 • Soluble salt concentration (electrical conductivity) maximum

5.0 dS/m • Man-made inert contaminants, dry weight basis

Less than 1% • Organic matter content, dry weight basis

25%-100% • Particle size, % passing 3/8 sieve, dry weight basis 30%-50%

Provide a written statement by the supplier certifying that the compost meets the above requirements. Submit for project -specific, local approval by the Representative (i.e. at the District or project level) as specified in Section 106.02.(a)

and Sediment Pollution Control Program Manual, as shown in the Table below. Provide manufacturer’s filter sock specifications, product date sheets, and drawings. Submit for project-specific, location approval by the Representative (i.e. at the District or project level) as specified in Section 106.02(a)2.c .

Material Type 3 mil HDPE 5 mil HDPE 5 mil HDPE Multi-Filament Polypropylene (MFPP) Heavy Duty Multi-Filament Polypropylene (HDMFPP) Material Characteristics Photo- degradable Photo- degradable Bio- degradable Photo- degradable Photo- degradable Filter Sock Diameters (in.) 12 and 18 12, 18, 24, and 32 12, 18, 24, and 32 12, 18, 24, and 32 12, 18, 24, and 32 Mesh Opening (in.) 3/8 3/8 3/8 3/8 1/8 Tensile Strength (psi) N/A 26 26 44 202 Ultraviolet Stability % Original Strength (ASTM G155) 23% at 1000 hr. 23% at 1000 hr. N/A 100% at 1000 hr. 100% at 1000 hr.

Minimum Functional Longevity 6 months 9 months 6 months 1 year 2 years

867.3CONSTRUCTION—As shown on the Standard Drawings, as indicated, and as follows:

to the project site. Fill filter sock with compost using pneumatic (blower) equipment or similar filter sock filling equipment to the length required. Place compost filter sock downslope of the earth disturbance on level contour as indicated. Extend both ends of the compost filter sock at least 8 feet upslope at 45 degrees to the main compost filter sock alignment. For lengths greater than 200 feet, use multiple compost filter sock sections and overlap ends at least 12 inches. Anchor compost filter socks placed on earthen slopes with stakes driven through the center of the compost filter sock or immediately downslope of the compost filter sock at 10 foot intervals consistent with the RC Standard Drawings and the DEP Erosion and Sediment Pollution Control Program Manual. Use concrete blocks immediately downslope of the compost filter sock (at the same intervals recommended for the stakes) where compost filter socks are placed on paved surfaces. Do not place the compost filter sock where it will concentrate drainage runoff or channel water to another location.

compost filter sock installation for damage that would make the compost filter sock non-functioning. Repair or replace damaged areas as directed. Replace compost filter socks after the minimum functional longevity time period identified in the Section 867.2(b) table for the type of filter sock material used. Remove built-up sediment retained by the compost filter sock when the sediment reaches 1/2 of the exposed height of the compost filter sock. Dispose of sediment as specified in the Erosion & Sediment Control Plan. Upon stabilization of the area tributary to the compost filter sock , remove the stakes. Remove compost filter sock or leave in place. If left in place, cut open the filter sock to expose the compost material completely and spread evenly to the contours of the site. Remove the filter sock unless the Representative authorizes it to remain.

867.4MEASUREMENT AND PAYMENT—Linear Foot for the specified filter sock diameter.