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�k <br /> 1.1rc•, rrr rirrl� Ii7c rryrrr;Y'lC'[� <br /> July 7, I999 <br /> Project No. 7G600-022-02 <br /> Ms. Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> i <br /> 304 East Weber Avenue <br /> Stockton, California 95202 <br /> i' <br /> Re: Monitoring Well Installation Report 3 <br /> Former ARCO Service Station #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 ARCO <br /> products Company (ARCO) to document the installation of four groundwater <br /> monitoring wells at the site referenced above (Figures 1 and 2). The purpose of this <br /> work was to evaluate the vertical and lateral extent of gasoline hydrocarbons in soil and <br /> groundwater beneath the site in the area of the underground storage tanks (USTs), <br /> product lines, and dispensers. This work was performed as described in the Work Plan <br /> for Site Assessment, dated January 27, I999. This work plan was approved by San s <br /> Joaquin County Environmental Health Department, as stated in your letter dated <br /> February 1, 1999 (Attachment A). <br /> SITE BACKGROUND <br /> Former ARCO Station #4493 is Iocated at 205 North Center Street in Stockton, <br /> California. The service station is currently inactive and was demolished during the first <br /> quarter of 1999. The site is located on property identified as Weber Point, and the <br /> Stockton Channel is located adjacent to the site to the south. Other properties on Weber <br /> Point have been vacated for upcoming redevelopment activities. The City of Stockton <br /> intends to redevelop 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 retested in January 1987 and one UST failed the integrity <br /> r <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 retested, and subsequently passed. On <br /> November 2, 1993, the UST line #2 failed testing. An O-ring was replaced and UST #2 <br /> 9912Hiisluc.tis1'[trk1)ruv, .Smte• too. .sat re,r',w;it,#. (:3 V5hti" t()Io)304 1880 tr)lol.iot 1Xir)F(lx it'll it.stvol. rrlx <br />