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T1 j URS 2005 APR 14 PM 1: 34 SAN J0P Q1jj,"4 COUNTY April 11, 2005 E N y]'- 1O l i E N T A L HEALTH DDIARTNEHT Mr Harlin Knoll, RE H S 02093 San Joaquin County Environmental Health Department 06 a3 304 East Weber Avenue, Third Floor Stockton, CA 95202 RE: Response to Initial Comments to Site Closure Report Former ARCO Station No. 2093 3425 Tracy Boulevard, Tracy, California Dear Mr Knoll On behalf of Atlantic Richfield Company (ARCO — a BP-affiliated company), URS Corporation Americas (URS) is providing this letter to the San Joaquin County Environmental Health Department (SJCEHD) in response to comments regarding well locations presented in the Site Closure Report dated February 24, 2005, for the former ARCO Station 2093 (site) located at 3425 Tracy Boulevard in Tracy, California In a telephone conversation with URS, you requested additional information regarding the • domestic supply well located at 3775 Tracy Boulevard in Tracy, CA The following letter presents revised text, revised Table 4, revised Figure 1, and Department of Water Resources (DWR) well completion reports for wells identified in the DWR well search Sensitive Receptors During the fourth quarter of 2004, URS performed a sensitive receptor survey at the site to identify the locations of water wells (municipal, domestic, and agricultural) within 2000 feet and surface water bodies, schools, and other receptors within 500 feet of the site The survey consisted of review of Department of Water Resources (DWR) San Joaquin District office well information, contacting the City of Tracy Public Works Water Resources Division (CTPWWRD), the local water purveyors, to ascertain the location of and pertinent well construction information for nearby wells, and a 500-foot field reconnaissance to locate and/or confirm the presence of wells or other sensitive receptors DWR records identified 14 wells within 2,000 feet of the site The records included information about 13 domestic wells and one well of unknown use The nearest identified well is approximately 700 feet north of the site and is located at the Chevron gasoline station across Hwy 205 This well is screened between 123 feet and 131 feet deep This well is no Ionger in use by the station, and it's location could not be verified The results of the DWR well search are provided in Table 4, the DWR well completion reports are presented in Appendix A, and the well locations are shown on Figure I Following initial review of the Site Closure Report dated February 24, 2005, SJCEHD provided URS with a well completion report that had been filed with the county but was not identified in the DWR records search The report is for a well owned by ARCO and located at the site However, the ARCO URS Corporation Crown Corporate Center 2870 Gateway Oaks Drive Suite 300 Sacramento CA 95833 Tel 916 679 2000 Fax 916 679 2900 K\Wprocess\J5 BP ARCO\020931Closure Report\ReponsetoHarlmsCotnments_030405 doc