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Foothill Landfill <br />Storm Water Pollution Prevention Plan <br />Page 47 <br />8.2 Advanced BMPs <br />Advanced BMPs consist of structural devices that reduce or prevent pollutants in storm water <br />discharges. To the extent economically and technologically feasible, the San Joaquin County <br />Foothill Landfill employs the use of advanced BMPs. The following describes some of the <br />structural (preventative and/or treatment structures) BMPs utilized at the facility. <br />8.2.1 Exposure Minimization BMPs <br />Overhead coverage is a BMP used for the storage <br />building, the landfill gas energy plant, and the <br />white waste / e-waste accumulation bins. Vehicle <br />maintenance lubricants and other fluids are kept <br />within the storage building. <br />8.2.2 Storm Water Containment and <br />Discharge Reduction BMPs <br />Most surface runoff from the industrial areas <br />ultimately flows to the on-site retention basins. For <br />many years having average to above-average rainfall <br />volumes, there is no discharge from the retention <br />basins. <br />8.2.3 Treatment Control BMPs <br />At this point, no treatment controls other than the retention basins for the settling of solids and <br />the evaporation / infiltration of storm water are used. If the facility was to reach Level 2 status, <br />treatment control BMPs would be implemented to reduce industrial pollution, and the permit- <br />required design storm standards would need to be employed. <br />8.2.4 Other Advanced BMPs <br />While they are not treatment as defined in General Permit sections X.H.2.b.iii and X.6, all <br />storm water conveyances swales immediately up-gradient of the outfalls utilize compost <br />filtering socks. <br />Figure 18 – Much of the process equipment for the <br />landfill gas energy plant is located within the covered <br />building. <br />Figure 19 – Northeast Retention Basin