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Stantec Consulting Inc. <br /> 3017 Kilgore Road, Suite 100 <br /> - Rancho Cordova , CA 95670 <br /> Tel: (916) 861-0400 <br /> Fax: (916) 861 -0430 <br /> Stantec <br /> April 3 , 2009 <br /> Mr, Michael Infurna <br /> Senior REHS <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street wricP t "7�l" �y,dv <br /> Stockton , CA 95202 <br /> Reference: Sampling Reduction Notification TGT <br /> ARCO Service Station No . 2130 <br /> 7906 North EI Dorado Street <br /> Stockton, California 95210 <br /> Stantec No. : 211601033.201 .522 <br /> Dear Mr. Infurna: <br /> On behalf of Atlantic Richfield Company (ARC) , a BP Affiliated Company, Stantec Consulting <br /> Corporation (Stantec) has prepared this letter for ARCO Service Station No. 2130 (site) to <br /> minimize the safety hazards for the groundwater sampling technicians while performing work at <br /> I the site. <br />{ <br /> Recently, during a routine groundwater sampling event at a site in Southern California, a traffic <br /> accident occurred while our groundwater sampling technician and traffic control subcontractor <br /> were setting up traffic control at a busy intersection . A more detailed summary of the incident is <br /> included as Attachment A. Our staff was not injured during the incident; however, based upon <br /> the findings during the accident review, Stantec and ARC have decided to eliminate and/or <br /> reduce the sample frequency for wells in or near roadways . <br /> There are currently two high-risk well locations at the site (Attachment B) . These wells include <br /> MW-7 and MW- 14 (both located on EI Dorado Street) , which are currently sampled on a semi- <br /> annual basis . A review of historical data (Attachment C) shows that groundwater analytical <br /> concentrations have been low to non-detect since June 22, 1994 in MW-7 and non-detect since <br /> December 11 , 2007 in MW-14. Based on the low to non-detect petroleum hydrocarbon <br /> concentrations, air sparge remedial activities since November 8 , 2006, and the over-riding risk <br /> to worker safety, it has been determined that MW-7 and MWA4 will be sampled annually (first <br /> quarter) rather than semi-annual . <br />'r <br /> 2130 Sampling Reduction Notification .doc 1 <br /> i= <br />