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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 />Design and <br />Installation <br />Specificutions <br />Maintenance <br />Standat•ds <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 />Depending on project type, size, complexity, and length, materials and <br />quantities will vary. A good minimum that will cover numerous situations <br />includes: <br />Material _ Measure Quantit� <br />Clear Plastic, 6 mil 100 foot roll 1-2 <br />Drain i e, 6 or 8 inch diameter 25 foot section 4-6 <br />Sandba s, filled each 25-50 <br />Straw Bales for mulchin , a rox. 50# each 10-20 <br />ua S alls ton 2-4 <br />Washed Gravel cubic ard 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 />• All materials with the exception of the quarry spalls, steel "T" posts, <br />and gravel should be kept covered and out of both sun and rain. <br />• Re-stock materials used as needed. <br />4-42 Volume !1— Construcfion Stormwater Pollution Prevention February 2005 <br />