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pipe,sandbags,geotextile fabric and steel"T"posts. <br /> . Materials should be stockpiled and readily available before any site clearing,grubbing,or <br /> earthwork begins.A large contractor or project proponent could keep a stockpile of materials <br /> that are available for use on several projects. <br /> . If storage space at the project site is at a premium,the contractor could maintain the materials <br /> at their office or yard.The office or yard must be less than an hour from the project site. <br /> Design and Installation Specifications <br /> Depending on project type,size, complexity, and length, materials and quantities will vary.A good <br /> minimum list of items that will cover numerous situations includes: <br /> . Clear Plastic,6 mil <br /> . Drainpipe,6 or 8 inch diameter <br /> . Sandbags,filled <br /> . Straw Bales for mulching <br /> . Quarry Spalls <br /> . Washed Gravel <br /> . Geotextile Fabric <br /> . Catch Basin Inserts <br /> . Steel"T"Posts <br /> . Silt fence material <br /> . Straw Wattles <br /> Maintenance Standards <br /> . All materials with the exception of the quarry spalls,steel"T"posts,and gravel should be kept <br /> covered and out of both sun and rain. <br /> . Re-stock materials as needed. <br /> BMP C151 : Concrete Handling <br /> Purpose <br /> Concrete work can generate process water and slurry that contain fine particles and high pH, both of <br /> which can violate water quality standards in the receiving water.Concrete spillage or concrete dis- <br /> charge to waters of the State is prohibited. Use this BMP to minimize and eliminate concrete,con- <br /> crete process water, and concrete slurry from entering waters of the State. <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume II-Chapter 3-Page 315 <br />