7500 HARDESON RD 7 ELEVEN 2024-02-29

Application of agricultural chemicals, including fertilizers and pesticides, shall be conducted in a manner and at application rates that will not result in loss of chemical to stormwater runoff. Manufacturers' recommendations for application rates and procedures shall be followed. BMPs shall be used to prevent or treat contamination of stormwater runoff by pH modifying sources. These sources include, but are not limited to, bulk cement, cement kiln dust, fly ash, new concrete washing and curing waters, waste streams generated from concrete grinding and sawing, exposed aggregate processes, and concrete pumping and mixer washout waters. Stormwater discharges shall not cause or contribute to a violation of the water quality standard for pH in the receiving water. Several BMPs applicable to this project include: • Concrete Handling (BMP C151) • Sawcutting and Surfacing Pollution Prevention (BMP C152) • Material Delivery, Storage, and Containment (BMP C153) • Concrete Washout Area (BMP C154) • Construction sites with significant concrete work shall adjust the pH of stormwater if necessary to prevent violations of water quality standards (BMP C250, BMP C251, BMP C252, and BMP C253). The Contractor may elect to follow the detailed guidance on control of non -sediment pollutants, as outlined in the SWMMWW (selected BMPs are included as Appendix B). Table 1 below lists several pollutants that are commonly found on construction sites that have the potential to contaminate storm runoff. These pollutants will be present mainly in areas of building and pavement construction. The Contractor and CESCL will be responsible for identifying areas where these pollutants are being used and will monitor runoff coming from these areas. Pollutant sources will be covered with plastic if contaminated runoff is observed from these areas. If contaminated runoff is found in the sediment trap or soils, the CESCL will direct the Contractor to remove the polluted water/soil and dispose of it in an approved area offsite. Table 1 — Potential Construction Site Stormwater Pollutants Trade Name Chemical/Physical Stormwater Material Description(') Pollutants(') Pesticides (insecticides, Various colored to colorless Chlorinated hydrocarbons, fungicides, herbicide, liquid, powder, pellets, or grains organophosphates, carbamates, rodenticides) arsenic Fertilizer Liquid or solid grains Nitrogen, phosphorous Plaster White granules or powder Calcium sulphate, calcium carbonate, sulfuric acid Cleaning solvents Colorless, blue, or yellow -green Perch loroethylene, methylene liquid chloride, trichloroethylene, petroleum distillates Asphalt Black solid Oil, petroleum distillates Concrete White solid Limestone, sand Glue, adhesives White or yellow liquid Polymers, epoxies Paints Various colored liquid Metal oxides, stoddard solvent, talc, calcium carbonate, arsenic Curing compounds Creamy white liquid Naphtha Wastewater from construction Water Soil, oil & grease, solids equipment washing Construction StPollution Prevention Plan 101DOM Everett 7-Eleven Parking Expansion 6 2180309.11