9600 SHARON DR EXPLORER MIDDLE SCHOOL 2016-05-27

CITY OF EVERETT STORMWATER MANAGEMENT MANUAL 9. Provide one or more sumps or catch basins capable of collecting all leachate generated by the design storm and conveying it to the leachate holding structure for all compost pads. 10. Convey all leachate from composting operations to a sanitary sewer, holding tank,or onsite treatment system designed to treat the leachate and total suspended solids. Contact the City's Industrial Pretreatment Program at(425)257-8874 for permits and information. 11. Ponds used to collect, store, or treat leachate and other contaminated waters associated with the composting process must be lined to prevent groundwater contamination. Apply all known available and reasonable methods of prevention and treatment(AKART)to all pond liners, regardless of the construction materials. 12. Cleanup debris from yard areas regularly. 13. Locate stored residues in areas designed to collect leachate. 14. Limit storage times of residues to prevent degradation and generation of leachate. 15. Consider using leachate as make-up water in early stages of the composting process. Since leachate can contain pathogenic bacteria,care should be taken to avoid contaminating finished product or nearly finished product with leachate. A3.6 Landscapinq and Lawn/Vegetation Manaqement Description of Pollutant Sources: Landscaping can include grading, soil transfer,vegetation removal, pesticide and fertilizer application,and watering. Stormwater contaminants include toxic organic compounds,heavy metals,oils,total suspended solids,coliform bacteria,fertilizers,and pesticides. Lawn and vegetation management can include control of objectionable weeds, insects, mold,bacteria,and other pests with chemical pesticides and is conducted commercially at commercial, industrial, and residential sites. Examples include weed control on golf course lawns,access roads,and utility corridors and during landscaping; sap stain and insect control on lumber and logs;rooftop moss removal; killing nuisance rodents; fungicide application to patio decks;and residential lawn/plant care. Toxic pesticides such as pentachlorophenol,carbamates,and organometallics can be released to the environment by leaching and dripping from treated parts,container leaks, product misuse, and outside storage of pesticide contaminated materials and equipment. Poor management of the vegetation and poor application of pesticides or fertilizers can cause appreciable stormwater contamination. Pollutant Control Approach: Control of fertilizer and pesticide applications, soil erosion,and site debris to prevent contamination of stormwater. Develop and implement an integrated pest management plan and use pesticides only as a last resort. Refer to Appendix D for an example. If pesticides/herbicides are used they must be carefully applied in accordance with label instructions on U.S. EPA registered materials. Maintain appropriate vegetation, with proper fertilizer application where practicable,to control erosion and the discharge of stormwater pollutants. Where practicable,grow plant species appropriate for the site,or adjust the soil properties of the subject site to grow desired plant species. Required BMPs for Landscaping 1. Do not dispose of collected vegetation into waterways or stormwater drainage systems. 2. Use mulch or other erosion control measures when soils are exposed for more than 1 week during the dry season or 2 days during the rainy season. Volume IV— Source Control 3-21