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BMP C150: Materials On Hand <br /> Purpose Quantities of erosion prevention and sediment control materials can be <br /> kept on the project site at all times to be used for emergency situations <br /> such as unexpected heavy summer rains. Having these materials on-site <br /> reduces the time needed to implement BMPs when inspections indicate <br /> that existing BMPs are not meeting the Construction SWPPP <br /> requirements. In addition, contractors can save money by buying some <br /> materials in bulk and storing them at their office or yard. <br /> Conditions of Use • Construction projects of any size or type can benefit from having <br /> materials on hand. A small commercial development project could <br /> have a roll of plastic and some gravel available for immediate <br /> protection of bare soil and temporary berm construction. A large <br /> earthwork project, such as highway construction, might have several <br /> tons of straw, several rolls of plastic, flexible pipe, sandbags, <br /> geotextile fabric and steel "T" posts. <br /> • Materials are stockpiled and readily available before any site clearing, <br /> grubbing, or earthwork begins. A large contractor or developer could <br /> keep a stockpile of materials that are available to be used on several <br /> projects. <br /> • If storage space at the project site is at a premium,the contractor could <br /> maintain the materials at their office or yard. The office or yard must <br /> be less than an hour from the project site. <br /> Design and Depending on project type, size, complexity, and length, materials and <br /> Installation quantities will vary. A good minimum that will cover numerous situations <br /> Specifications includes: <br /> Material Measure Quantity <br /> Clear Plastic, 6 mil 100 foot roll 1-2 <br /> Drainpipe, 6 or 8 inch diameter 25 foot section 4-6 <br /> Sandbags, filled each 25-50 <br /> Straw Bales for mulching, approx. 50# each 10-20 <br /> Quarry Spalls ton 2-4 <br /> Washed Gravel cubic yard 2-4 <br /> Geotextile Fabric 100 foot roll 1-2 <br /> Catch Basin Inserts each 2-4 <br /> Steel "T" Posts each 12-24 <br /> Maintenance • All materials with the exception of the quarry spalls, steel"T"posts, <br /> Standards and gravel should be kept covered and out of both sun and rain. <br /> • Re-stock materials used as needed. <br /> 4-42 Volume ll— Construction Stormwater Pollution Prevention February 2005 <br />