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INTERWEST — EVERETT CONTRACTOR'S YARD INTERIM FILL PROJECT Sitts & Hill Engineers, Inc. <br />' CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN Job Number 17,733 <br />Approved as Equivalent <br />Ecology has approved products as able to meet the requirements of BMP C105: Stab- <br />ilized Construction Entrance / Exit. The products did not pass through the Technology <br />Assessment Protocol — Ecology (TAPE) process. Local jurisdictions may choose not to <br />accept this product approved as equivalent, or may require additional testing prior to con- <br />sideration for local use. The products are available for review on Ecology's website at <br />' http:/Mrww.ecy.wa.gov/programs/wq/Stormwater/newtech/equivalent,htmi <br />BMP C106: Wheel Wash <br />urpose <br />W el washes reduce the amount of sediment transported onto pave:nZstrucfion4 <br />or <br />vehic s. <br />' Condit. s of Use <br />When a stabile d construction entrance (see BMP C105: Stabilized <br />' Entrance/Exit(. 0 is not preventing sediment from being trac d onto pavement. <br />. Wheel washing generally an effective BMP when ins ed with careful attention <br />to topography. For ample, a wheel wash can be de ' ental if installed at the top <br />of a slope abutting a ht-of-way where the water f the dripping truck can run <br />unimpeded into the stre <br />. Pressure washing combine ith an adequ ly sized and surfaced pad with dir- <br />ect drainage to a large 10-foot 0-foot s p can be very effective. <br />. Discharge wheel wash or fire bath ater to a separate on -site treatment sys- <br />tem that prevents discharge to su ater, such as closed -loop recirculation or <br />upland land application, or to sanita ewer with local sewer district approval. <br />. Wheel wash or fire bath w ater should include wastewater from concrete <br />washout areas. <br />Design and /nstallati Specifications <br />Suggested details ar shown in Figure 11-4.1.2 Wheel Wash . 76 . The Local Per- <br />mitting Authority y allow other designs. A minimum of 6 inches f asphalt treated base <br />(ATB) over cru ed base material or 8 inches over a good subgrade\bdump <br />'o <br />pave the wh I wash. <br />Use a I clearance truck to test the wheel wash before paving. Eithlowb will work well to test clearance. <br />p the water level from 12 to 14 inches deep to avoid damage to tg <br />e track tongues with water. <br />2014 Stormwater Management Manual for Westem Washington <br />Volume ll - Chapter 4 - Page 274 <br />SITTS & HILL ENGINEERS, INC. 29 <br />' TACOMA, WASHINGTON <br />