220 OLYMPIC BLVD VA OUTPATIENT CLINIC 2023-02-09

parking lot driveways,can be sources of toxic hydrocarbons and other organic compounds, including oils and greases, metals, and suspended solids. I I I I I Pollutant Control Approach: If the parking lot meets the site use thresholds to determine if the site is expected to generate high concentrations of oil, as defined in Step 2: Determine if an Oil Con- trol BMP is Required in III-1.2 Choosing Your Runoff Treatment BMPs, provide oil removal equip- ment for the contaminated stormwater runoff. Applicable Operational BMPs: . If a parking lot must be washed,discharge the washwater to a sanitary sewer, if allowed by the local sewer authority,or other approved wastewater treatment system,or collect wash- water for off-site disposal. . Do not hose down the area to a storm sewer or receiving water.Vacuum sweep parking lots, storage areas,and driveways regularly to collect dirt,waste,and debris. Mechanical or hand sweeping may be necessary for areas where a vacuum sweeper cannot reach. I . Clean up vehicle and equipment fluid drips and spills immediately. . Place drip pans below leaking vehicles(including inoperative vehicles and equipment)in a I II I 1 manner that catches leaks or spills, including employee vehicles. Drip pans must be managed Ito prevent overfilling and the contents disposed of properly. Recommended Operational BMPs: . Encourage employees to repair leaking personal vehicles. I . Encourage employees to carpool or use public transit through incentives. I . Encourage customers to use public transit by rewarding valid transit pass holders with dis- counts. . Install catch basin inserts to collect excess sediment and oil if necessary. Inspect and maintain catch basin inserts to ensure they are working correctly. Applicable Treatment BMPs: Establishments subject to high-use intensity are significant sources of oil contamination of storm- water. Examples of potential high use areas include customer parking lots at fast food stores,gro- cery stores,taverns, restaurants, large shopping malls, discount warehouse stores,quick-lube shops,and banks. Refer to Step 2: Determine if an Oil Control BMP is Required in I II 1.2 Choosing Your Runoff Treat- ment BMPs for the site use thresholds that determine if an oil control BMP is required,and for a list of oil control BMPs. S430 BMPs for Urban Streets Description of Pollutant Sources: Urban streets can be the source of vegetative debris, paper, fine dust,vehicle liquids,tire and brake wear residues,heavy metals(lead and zinc),soil particles, 2019 Stormwater Management Manual for Western Washington Volume IV-Chapter 3-Page 518