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STORMWATER MANAGEMENT PLAN (SWMP) <br />AND EROSION AND SEDIMENT CONTROL REPORT <br />FOR <br />ST. VRAIN LAKE GRADING IMPROVEMENT PLANS <br />Page 12 <br />strips, protection of trees, and preservation of mature vegetation. All <br />seeding, fertilizers, and mulching shall conform to the approved <br />construction plans, the Weld County Criteria and the Urban Drainage <br />guidelines. All disturbed areas shall be stabilized by seeding in <br />accordance with the seed mix specified on the approved erosion control <br />plan. The engineer may require additional BMPs as necessary to <br />retard sediment transport. <br />Non-structural controls for this site shall include permanent seeding and <br />mulching. <br />• Mulching is the application of a layer of plant residue or similar <br />i j materials over a certain area in order to reduce the effects of <br />raindrop surface impact, slow the velocity of overland flow and <br />• i reduce wind erosion. <br />_, <br />Blankets, Netting, or Matting can be used on permanent slopes <br />~ steeper than 3:1 to reduce erosion. <br />;1 <br />• Temporary Seeding is required in areas that have been graded but <br />are not to be permanently re-vegetated for an extended period (not <br />to exceed 2 years). Seeding produces a vegetative cover, which <br />greatly decreases the effects of erosion. <br />B. Materials Handling and Spill Prevention <br />1. Materials Management Practices <br />Materials are sometimes used at the construction site that present a <br />potential for contamination of storm water runoff. These include fuel, <br />oil, lubricants, paints, solvents, concrete-curing compounds and other <br />liquid chemicals such as fertilizers, herbicides and pesticides. <br />Practices that can be used to prevent or minimize toxic materials in <br />runoff from a construction site are described in this section. <br />A list of all potentially toxic or hazardous chemicals used shall be <br />maintained on the site. Warning labels must be attached to all <br />potentially toxic or hazardous chemicals. Material Safety Data Sheets <br />