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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://www.ecy.wa.gov/programs/wq/stormwater/newtech/eq uivalent.html <br /> BMP C106: Wheel Wash <br /> Purpose <br /> Wheel washes reduce the amount of sediment transported onto paved roads by motor <br /> vehicles. <br /> Conditions of Use <br /> When a stabilized construction entrance (see BMP C105: Stabilized Construction <br /> Entrance/ Exit(p.270)) is not preventing sediment from being tracked onto pavement. <br /> . Wheel washing is generally an effective BMP when installed with careful attention <br /> to topography. For example, a wheel wash can be detrimental if installed at the top <br /> of a slope abutting a right-of-way where the water from the dripping truck can run <br /> unimpeded into the street. <br /> . Pressure washing combined with an adequately sized and surfaced pad with dir- <br /> ect drainage to a large 10-foot x 10-foot sump can be very effective. <br /> . Discharge wheel wash or tire bath wastewater to a separate on-site treatment sys- <br /> tem that prevents discharge to surface water, such as closed-loop recirculation or <br /> upland land application, or to the sanitary sewer with local sewer district approval. <br /> . Wheel wash or tire bath wastewater should not include wastewater from concrete <br /> washout areas. <br /> Design and Installation Specifications <br /> Suggested details are shown in Figure 11-4.1.2 Wheel Wash (p.276). The Local Per- <br /> mitting Authority may allow other designs. A minimum of 6 inches of asphalt treated base <br /> (ATB)over crushed base material or 8 inches over a good subgrade is recommended to <br /> pave the wheel wash. <br /> Use a low clearance truck to test the wheel wash before paving. Either a belly dump or <br /> lowboy will work well to test clearance. <br /> Keep the water level from 12 to 14 inches deep to avoid damage to truck hubs and filling <br /> the truck tongues with water. <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume ll-Chapter 4 -Page 274 <br />