870SEDIMENT TRAP - EMBANKMENT

870.1DESCRIPTION —This work is construction , maintenance, and removal of an embankment type

sediment trap.

870.2MATERIAL—

• Posts. 2-inch by 2-inch Alkaline Copper Quat (ACQ) Pressure Treated, Spruce/Pine/Fir, Grade 2

• Plywood. 3/4-inch thick, Alkaline Copper Quat (ACQ) Pressure Treated, Spruce/Pine/Fir. Certify as specified in Section 106.03(b)3.

• Fasteners. Deck screws of adequate length and approved for use with Alkaline Copper Quat (ACQ) Pressure Treated wood. Certify as specified in Section 106.03(b)3.

or other approved material of adequate size and length.

870.3CONSTRUCTION —Construct, as shown on the Standard Drawings , at the location indicated or

directed, as follows: Clear and grub the site, as specified in Section 201.3. Construct the sediment trap by excavating as specified in Section 203.3, forming embankments as specified in Section 206.3, and placing aggregate or rock at the outlet as indicated. If a plywood extension is required, construct as indicated to the elevations indicated. Place geotextiles, as specified in Section 212.3 for the type indicated . If required, obtain borrow excavation for the formation of the embankment, as specified in Section 205. Apply seeding and soils supplements, as specified in Section 804.3. Mulch, if required, as specified in Section 805.3. Install and maintain cleanout stake as required, as indicated, or as directed. Inspect sediment trap after each runoff event. Remove accumulated sediment as specified in Section 861.3 and replace aggregate when it is contaminated with sediment, washed out, or as directed. When the tributary area to the sediment trap is stabilized, or the sediment trap is no longer required, or when directed, recondition the site by filling in excavated areas, by removing embankments , plywood extension (where required), and aggregate and by restoring the area, as specified in Section 105.14.

870.4MEASUREMENT AND PAYMENT—

Section 205.4.

For the type indicated.

For the type indicated.

Section 850.4(a).

For the type indicated.