Laserfiche WebLink
Maintenance Standards <br /> . Inspect all forms of inlet protection frequently,especially after storm events.Clean and <br /> replace clogged catch basin filters. For rock and gravel filters, pull away the rocks from the <br /> inlet and clean or replace.An alternative approach would be to use the clogged rock as fill and <br /> put fresh rock around the inlet. <br /> . Do not wash sediment into storm drains while cleaning.Spread all excavated material evenly <br /> over the surrounding land area or stockpile and stabilize as appropriate. <br /> Approved as Functionally Equivalent <br /> Ecology has approved products as able to meet the requirements of this BMP.The products did not <br /> pass through the Technology Assessment Protocol—Ecology(TAPE)process. Local jurisdictions <br /> may choose not to accept these products, or may require additional testing prior to consideration for <br /> local use. Products that Ecology has approved as functionally equivalent are available for review on <br /> Ecology's website at: <br /> https://ecology.wa.gov/Regulations-Permits/Guidance-technical-assistance/Stormwater-per- <br /> mittee-guidance-resources/Emerging-stormwater-treatment-technologies <br /> BMP C231 : Brush Barrier <br /> Purpose <br /> The purpose of brush barriers is to reduce the transport of coarse sediment from a construction site <br /> by providing a temporary physical barrier to sediment and reducing the runoff velocities of overland <br /> flow. <br /> Conditions of Use <br /> • Brush barriers may be used downslope of disturbed areas that are less than one-quarter acre. <br /> . Brush barriers are not intended to treat concentrated flows, nor are they intended to treat sub- <br /> stantial amounts of overland flow.Any concentrated flows must be directed to a sediment trap- <br /> ping BMP.The only circumstance in which overland flow can be treated solely by a brush <br /> barrier, rather than by a sediment trapping BMP, is when the area draining to the barrier is <br /> small. <br /> . Brush barriers should only be installed on contours. <br /> Design and Installation Specifications <br /> . Height:2 feet(minimum)to 5 feet(maximum). <br /> . Width:5 feet at base(minimum)to 15 feet(maximum). <br /> . Filter fabric(geotextile)may be anchored over the brush berm to enhance the filtration ability <br /> of the barrier.Ten-ounce burlap is an adequate alternative to filter fabric. <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume II-Chapter 3-Page 365 <br />