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SECOR <br /> international ftimporated <br /> September 5, 2000 <br /> Project 077.41883.330 <br /> Ms. Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue <br /> Stockton, California 95201 <br /> Re: Additional Site Assessment Report <br /> Former ARCO Service Station 4 4493 <br /> 205 North Center Street <br /> Stockton, California <br /> Dear Ms. Duncan-. <br /> SECOR International Incorporated (SECOR) has prepared this letter on behalf of <br /> Atlantic Richfield Company (ARCO) to document the installation of three groundwater <br /> monitoring wells and the drilling of one soil boring at the site referenced above (Figures I <br /> and 2). The purpose of this work was to evaluate the horizontal and vertical extent of <br /> hydrocarbons in soil and groundwater beneath the site. This work was performed as <br /> described in the Work Plan.iur Additional A.s'sessnieiil, dated November 29, 1999 and <br /> Revised Woi'k Plan fol"Addllional A.Y.Yesvinent olid Mlerim Remediation of HydrocurboAv <br /> in Ground+valer, dated January 11, 2000. The work was approved, with the exception of <br /> the biosparge wells, by San Joaquin County Environmental Health Department as <br /> indicated in their letters dated December 14, 1999 and February 1, 2000 (Attachment A). <br /> SITE BACKGROUND <br /> Former ARCO Station #4493 is located at 205 North Center Street in Stockton, <br /> California. The former service station was demolished during the first quarter of 1999 <br /> and the lot is currently vacant. The site is located on property identified as Weber Point, <br /> and the Stockton Channel is located adjacent to the site to the south. The City of <br /> Stockton has redeveloped the Weber Point area as a city park:. <br /> Three 12,000-gallon USTs were installed at the site in 1984, The USTs were tightness <br /> tested thirteen times between 1986 and 1996. The USTs tested tight except in the <br /> following cases. In October 1986, the USTs exceeded the maximum loss rate for tight <br /> USTs. The USTs were re-tested in January 1987 and one UST failed the integrity <br /> testing. A vapor line for the UST was repaired, the UST was re-tested, and passed in <br /> December 1987, On March 19, 1993, two leak detectors failed integrity testing. The <br /> leak detectors were replaced; the system was re-tested, and subsequently passed. On <br /> • November 2, 1993, the UST line 142 failed testing. An O-ring was replaced and UST 42 <br /> line passed testing. In 1996, fluid was reportedly leaking from UST #3. UST 43 was <br /> 3017 Kilgore Road, Suite 100, Rancho Corclova, CA 95670 916.861.0400 916.861.04,301'ax uww.secor.coin <br />