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9 0 <br /> time). With the local oil level indicator Safeway operators will be able to notify a local <br /> used oil recycler to empty the tank when the tank is approaching full volume. <br /> Used oil is pumped to the tank via an air-operated diaphragm pump. Although the piping <br /> is pressurized,the steel piping is located indoors and overhead in the work areas. Pipeline <br /> leaks would be readily identifiable as wet spots on the work floor. Oil removed from the <br /> tank is by a licensed oil recycler using a suction pump and hosing. If a leak occurs in the <br /> suction piping, oil transfer will immediately cease because the suction piping will loose <br /> vacuum;thus, stopping the transfer of oil from the tank to the recycling truck. <br /> (k) (7) description and evaluation of secondary containment ... <br /> Assessment Results=Adequate <br /> The tank is installed within a concrete block containment zone and occupies a common area <br /> with a 4,800-gal Motor Oil tank. The combined volume of both tanks is approximately 5,800- <br /> gal (4,800-gal+ 1,000-gal used oil). The total containment volume of the secondary <br /> containment area is just over 7,800-gal. If the new Motor Oil tank was to completely fail, the <br /> containment volume is adequate considering the 1,000-gal Used Oil tank will reduce the <br /> containment volume by 1,000-gal;leaving a net-containment volume of 6,800-gal. Similarly, <br /> if the Used Oil tank released its full volume of 1,000-gal, the net-containment volume <br /> available with the installed Motor Oil tank would be more than adequate to contain the 1,000- <br /> gal of used oil released to the containment zone. <br /> Subsection(k)(7)requires the secondary containment provisions to meet the minimum <br /> standards of section 66265.192 0)(1)to 0)(3). The used oil storage tank is designed and <br /> meets the minimum requirements as follows: <br /> 0)(1)the tank system must have secondary containment capable of containing 100 <br /> percent of the contents of the tank and ancillary piping volume; <br /> • See description above regarding secondary containment adequacy <br /> 0)(2)the provision to contain rainwater in the secondary containment area is not <br /> applicable to a lube cube designed tank because the secondary containment area is <br /> sealed from rainwater intrusion. <br /> • Not applicable: tank is installed and operated indoors and not subject to <br /> rainfall events. <br /> 0)(3)tank system secondary containment shall be provided with a leak detection system <br /> that is designed and operated so that it will detect either the failure of the primary <br /> and secondary containment structure or any release of hazardous waste or <br /> accumulated liquid in the secondary containment system within 24 hours, or at the <br /> earliest practicable time if the existing detection technology or site conditions will <br /> not allow detection of a release within 24 hours. <br /> • The location of the used oil tank and its operation is such that the oil storage <br /> area is access daily and visual inspections would detect releases immediately. <br /> The Truck Repair is continually manned 7 days per week,24-hours per day. <br /> Thus a release would be visually detected within 24-hours. <br /> Tank System Assessment Page 4 <br /> June 2011 <br />