7500 HARDESON RD 2021-06-09 - Laserfiche WebLink

All pollutants, including waste materials and demolition debris,that occur onsite shall be handled and disposed of in a manner that does not cause contamination of stormwater. Woody debris may be chopped and spread onsite. Cover, containment, and protection from vandalism shall be provided for all chemicals, liquid products, petroleum products, and non-inert wastes present on the site(see Chapter 173-304 WAC for the definition of inert waste). Onsite fueling tanks shall include secondary containment. Maintenance and repair of heavy equipment and vehicles involving oil changes, hydraulic system I drain down, solvent and de-greasing cleaning operations,fuel tank drain down and removal, and other activities which may result in discharge or spillage of pollutants to the ground or into stormwater runoff must be conducted using spill prevention measures, such as drip pans. Contaminated surfaces shall be cleaned immediately following any discharge or spill incident. Emergency repairs may be performed onsite using temporary plastic placed beneath and, if raining, over the vehicle. Wheel wash or tire bath wastewater shall be discharged to a separate onsite treatment system or to the sanitary sewer. Application of agricultural chemicals, including fertilizers and pesticides, shall be conducted in a 111 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. I 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. Construction sites with significant concrete work shall adjust the pH of stormwater if necessary to prevent violations of water quality standards. 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 I 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. 1 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 Construction Stonnwater Pollution Prevention Plan Everett 7-Eleven 6 01111:3111 2180309.10