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�w <br /> rte, - .� w �°� «y- _ x` ��'-#�'"k� .�,� _�.- � '.� _ '° tea�•,�w {s �"��-C,a� � `'r �-,�.P '�$' .r.� <br />�• 'r' ��: "'��_ -">:� aax !� � n� 3 ,.tea•:: a�•^ �. ^� �����sa., '•;�' y.:.:h,'� �- m "' .� .. <br /> Brown and Caldwell <br /> RECEIVED <br /> ..;: .. JAN 17 1992 <br /> ENVIRONMENTAL.HEALTH <br /> PERW/ri'ERVIOES <br /> January 13, 1992 <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> 2000 Alameda de las Pulgas <br /> Post Office Box 5811 <br /> San Mateo, California 94403 017-6396-04/1 <br /> cnbject: Excavation of Product Recovery Tank and Installation of New Waste Oil <br /> Tank at ARCO Station 2133, Stockton, Site Code 1021 <br /> Dear M*. Carmel: <br /> On September 23, 1991, Brown and Caldwell Consultants (BCC) conducted soil sampling <br /> during the rerrc,val of ono product recovery tank and the installation of a new waste oil tank <br /> at ARCO Products Company (ARCO) Statica 2133. The site is located at 2908 Benjamin <br /> Holt Drive, Stockton. The soil sampling was authorized by ARCO under Task Order 2133- <br /> 91-1. <br /> Rackground <br /> In May 1984, free hydrocarbon product was identified on the groundwater after a leak <br /> occurred in one of the underground storage tanks (USTs) of fuel. The leaking tank and <br /> surrounding soil was removed after approximately 2,000 gallons of fuel were lost. New tanks <br /> were installed in the same area in June 1984. Efforts to recover the free product after the leak <br /> occurred were somewhat successful (690 gallons plus an additional 500 gallons during the <br /> tank removal). Soon after the leak and subsequent product recovery, a groundwater <br /> extraction/product recovery system were installed. This system included a subsurface tank to <br /> be used for recovery of free product. By the time the installation of the system was complete, <br /> free product thickness had been reduced to less than 1/4-inch. The recovery tank was only <br /> used for a short period of time after it was installed because the remaining product was <br /> extracted rapidly with the operation of the system. The tank probably contained only a small <br /> quantity of product at any time. <br /> The tank has not contained product since 1986 but remained in place as a contingency for <br /> future use. The compliance requirements for maintaining the tank did not warrant leaving the <br /> tank in place so the decision was made to have it removed. <br /> Recovery Tank Removal <br /> The tank was removed on September 23, 1991,under the direction of a County representative. <br /> Once removed, the integrity of the tank was observed, Tl.te tank was in excellent ccidition <br /> with no indication of leakage. The tank was transported to Erickson, Inc.,of Richmond, CA <br /> h)V6�COR1tE5Nb396 W.L 1 <br /> 111RI�'�t�rlln���cti asp <br />