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' JAMES M. MONTGOMERY, CONSULTING ENGINEERS, INC. <br /> 501 Lennon Lane,Suite 200,Walnut Creek,California 945901(415)933-2250 <br /> July 13, 1988 l 1; l_l T-11_U` '. <br /> JUL 14 1988 <br /> City of Manteca <br /> CITY OF MAN'ECA <br /> Department of Public Works PTJBLI+- TO-,K� DEP' ', <br /> 1001 West Center Street <br /> Manteca, CA 95336 <br /> Attention: Mr. Jim Podesta File: 912.0330 <br /> Subject: Bob's Muffler 3c Radiator Shop Discharge Request <br /> 466 Moffat Boulevard <br /> Gentlemen: <br /> This letter reviews a request to discharge of the contents from two abandoned <br /> underground gasoline storage tanks to the City of Manteca collection system. <br /> The tanks are located at Bob's Muffler & Radiator Shop at 466 Moffat Boulevard. <br /> Permission to discharge the tanks contents was requested by the owner of the <br /> property. <br /> The two tanks in question were filled with water by the fire department 11 years <br /> ago and abandoned in place. The tanks have capacities of 8,000 and 10,000 <br /> gallons. <br /> An analysis of tank contents shows low concentrations of gasoline components. <br /> These gasoline components present two collection system disposal concerns: <br /> development of flammable conditions, and toxic effects at the treatment plant. <br /> These concerns were investigated in reviewing the disposal of the tank contents. <br /> The investigation into flammability indicates that the lower limits of <br /> flammability are approached for the gasoline components in the water. Because <br /> conditions are unknown in the collection system and vapors from the gasoline <br /> components could be retained in the collection system, JMM recommends against <br /> disposal to the collection system. <br /> The concentration of the gasoline components in the water is below levels known <br /> to be toxic to treatment plant processes. The disposal of the tank contents is <br /> therefore not expected to have an adverse effect on the treatment system. <br /> Because toxic effects are not expected from the tank contents, disposal directly <br /> to the treatment plant headworks is a recommended alternative method of <br /> disposal. This would require the transfer of the tank contents to a tank truck <br />