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Eyler & <br /> Kalinowski, <br /> E�14'(ir���utcfiT�?I Nl- Inc. <br /> ��. ,J!r��l 1�1 <br /> - .Ft1 Y,�1IrE Consulting Engineers and Scientists <br /> 1870 Ogden Drive <br /> 02 AUG 22 PM 12: 15 Burling(650)292-991401000 <br /> ' 21 August 2002 Fax:(650)552-9012 <br /> ' Dennis H. Catanyag <br /> San Joaquin County <br /> t Environmental Health Department <br /> 304 East Weber Avenue, 3`d Floor <br /> Stockton, California 95202-2708 <br /> Subject: In-Place Closure of Underground Storage Tank <br /> ' POSDEF Power Company, L.P., Stockton, California <br /> (A20020.00) <br /> Dear Mr. Catanyag: <br /> ' Erler & Kalinowski, Inc. ("EKI") has prepared this letter on behalf of POSDEF Power <br /> Company, L.P. ("POSDEF") in response to meetings and telephone conversations with <br /> ' you regarding the proposed in-place closure of an underground storage tank at the <br /> POSDEF facility located at 2526 West Washington Street in Stockton, California. <br /> Specifically, this letter summarizes the investigative activities that have been performed, <br /> ' and provides background on the need to close the tank in-place, the reason that further <br /> sampling beneath the tank cannot be accomplished at the present time, and the actions <br /> proposed to complete the in-place closure of the tank. <br /> ' EVALUATION OF TANK INTEGRITY AND CHARACTERIZATION OF <br /> ' ENVIRONMENTAL CONDITIONS <br /> The tank requiring closure is a 1,000-gallon underground storage tank that held used <br /> ' motor and machine oils. The tank was installed at the time the POSDEF facility was <br /> constructed in 1991 (Figures 1 and 2). A secondary containment system, consisting of a <br /> 10-gauge outer shell, completely wraps the inner shell or primary tank (Figure 3). The <br /> ' outer shell of the tank is coated with polyurethane and is equipped with a sacrificial <br /> anode cathodic protection system to resist the effects of soil corrosion. <br /> When the used oil tank was in operation, it was continuously monitored for leaks by an <br /> electronic leak detector installed within the interstitial space of the tank. On <br /> 20 March 1998, the electronic leak detector activated an alarm in the POSDEF control <br /> ' room. POSDEF personnel inspected the tank and determined that the outer shell that <br /> served as the secondary containment system was compromised. Water had entered the <br /> outer shell and triggered the alarm. Integrity testing performed on 19 April 1998 <br /> The Presiaio of San Francisco•(415)561-3355•Fax(415)561-3360•Southern California Office•(949)251-9480•Fax(949)251-9508 <br /> Colorado Office•(303)796-0556•Fax(303)796-0546 <br />