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STORM AND SURFACE WA'fER <br />An automatic shut-off device shall be installed that stops the Flow of product being delivered to the <br />underground storage tank when the underground tank is full. <br />4-5.2(4) ABOVE-GROUND STORAGE TANKS <br />Single-wall above-ground storage tanks shall be placed in a bermed, impervious azea. The bermed area <br />shall be paved with Portland cement concrete for permanent installations. The bermed uea shall be lazge <br />enough, and the berms high enough, to contain 110% of the lazgest tank's total volume or 10% of the <br />total tank volume, whichever is largest. An oudet shali be provided from the bermed area to allow <br />drainage of accumulated rain water. The outlet shall b�: equ�pped with a manually operated valve that <br />shall be kept in the closed position except when the a*Ya is bemg drained of accumulated rain water. <br />Accumulated rain water shall be released frequently during the wet season. Multi-wall tanks need not <br />provide bermed containment. <br />One of the following items shall be installed to prevent overfilling of the tank: an audible alum system, <br />triggered by a liquid level sensor, to alert the operator when the tank has been filled to 95 % capacity; or <br />an automa�c shut-off device that stops the flow of product being delivered to the storage tank when the <br />tank is full. <br />4-5.3 AUTO REPAIR/MAINTENANCE SHOPS <br />No physical conne:.tion to the storm drainage system will be allowed for repair bays, fluid dispensing <br />azeas, or storage areas. Automotive oil, transmission fluids, antifreeze, etc., shall be stored undercover <br />and sYall Ue isolated from the storm drainage system. Outside dumpsters shall be placed under-cover, <br />and shall have a containment berm placed azound the dumpster. Oil absorbent material shall be kept <br />N iGhin the containment berm and shall be replaced as the material becomes saturated. <br />Vehicle maintenance shops often steam clean vehicle engines and parts. Any waste water generated from <br />steam cleaning on this site must not enter the storm drain system. A separate area must be provided for <br />this type of activity which discharges to the sanitary sewer. The area where steam cleaning will occur <br />must be covered, paved with Portland cement concrete, and hydrologically isolated from the site's storm <br />drain system. An oil/water separator will be required to treat !he waste water before dischuge to the <br />sanitary sewer. Design details for the oil/water separ.itor wi11 be available from the City's Industrial <br />Pretreatment Program. <br />4-5.4 RETAIL AUTO PARTS STORES <br />One or more containers (such as garbage cans) with a minimum capacity of 30 gallons shall be placed in a <br />convenient ]ocation for customers to dispose of empty motor oil containers. The containers shall be leak- <br />proof and shall be covered to protect against the entrance of rainwater. Containers shall be emptied <br />regulazly and before containers reach 90% of their full capacity. A sign shall be placed near the <br />containers requesting customers to re-cap oil containers before d�sposal. <br />4-5.5 CAR WASHES <br />Process water from all car washes shall be discharged througn an oil/water separator prior to dischazging <br />into the sanitary sewer system. A discharge authorization permit from the City's Industrial Preveatment <br />P_ogram will be required for the sanitary sewer connection. All soaps, detergents, degreasers, etc., must <br />be stored under cover and isolated from the storm drain system. <br />4-5.6 NEW AND USED AUTO DEALERSHIPS <br />No physical connection ro the srorm drainage system will be allowed for repair bays, fluid dispensmg <br />STANDARDS 4-6 <br />