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RECEIVED <br /> NOV 1 1989 <br /> COMPLIANCE OPTIONS ENVIRONMENTAL HEALTH <br /> DWG evaluated the following options to bring Vaults 1, 5, 6, 7 and PERMIT/SERViCES <br /> 8 into compliance with Title 23 requirements: <br /> 1) Vault Lining - Line the vaults with an impermeable fiberglass <br /> liner, perform additional subsurface investigation to deter- <br /> mine the extent of released chemicals in soil beneath the <br /> vaults and, based on the results of the additional investiga- <br /> tion, determine what further actions, if any, would be <br /> required. <br /> 2) Double-contain Existing Vaults - Line the concrete vaults <br /> with fiberglass and install a second tank inside the lined <br /> vaults to bring the existing vault structures into Title 23 <br /> compliance. Evaluate the extent of released chemicals <br /> in the subsurface and determine whether site remediation <br /> is needed. <br /> 3) Above-ground Storage - Transfer refrigerant storage from <br /> the existing underground vaults to above-ground tanks and <br /> close the existing underground vaults. Evaluate the extent <br /> of released chemicals in the subsurface to determine vault <br /> closure requirements and whether site remediation is needed. <br /> SELECTED COMPLIANCE OPTION <br /> DWG has selected Option 3 above: Above-ground storage. DWG intends <br /> to install above-ground tanks adjacent to the current existing under- <br /> ground vault locations, transfer refrigerant storage to the above- <br /> ground tanks and appropriately close the existing underground vaults. <br /> The above-ground tanks will be located to not affect potential addi- <br /> tional subsurface investigation. The tank design and operation <br /> will conform to all pertinent regulations. <br /> The existing underground vaults will be closed following installation <br /> and testing of the above-ground tanks. We will work with SJLHD <br /> to determine appropriate closure requirements for the underground <br /> vaults and the scope-of-work for additional subsurface investigation. <br /> A schedule for the design and installation of the above-ground tanks <br /> and closure of the existing underground vaults is presented below. <br /> Task Completion Date <br /> Detailed Engineering Design and <br /> Equipment Selection 1/1/90 <br /> Procure Equipment 4/1/90 <br /> Install Equipment 5/1/90 <br /> Test Systems 5/15/90 <br /> Transfer Refrigerant Storage <br /> to Above-ground Tanks 6/1/90 <br /> -2- <br />