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Stantec Consulting Inc. <br /> 3017 Kilgore Road,Suite 100 <br /> Rancho Cordova,CA 95670 <br /> ___Gr' <br /> Tel:(916)861-0400 i <br /> Fax:(916)861-0430 <br /> Sta11W[ MLEI���5 i=U ; <br /> APR � � 209 <br /> April 3, 2009 <br /> ENVIRONaNI_Mi}T HEALTH <br /> Ms. Lori Duncan PERMIT/SERVICES <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Reference: Sampling Reduction Notification <br /> Former ARCO Service Station No. 4493 <br /> 205 North Center Street <br /> Stockton, California;95202 <br /> Stantec No,: 211601044.201.522 <br /> Dear Ms. Duncan: <br /> On behalf of Atlantic Richfield Company (ARC), a BSP 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 /> the site. <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 three high-risk well locations at the site (Attachment B). These wells include <br /> MW-7 (located on Center Street), MW-11 M, and MW-11 D (both located on EI Dorado Street), <br /> which are currently sampled on a semi-annual basis. A review of historical data (Attachment C) <br /> shows that groundwater analytical concentrations have been low to non-detect since November <br /> 16, 2006 in MW-7, low to non-detect since Decembier 13, 2005 in MW-11 M, and low to non- <br /> detect since March 9, 2006 in MW-11D. Based on the low to non-detect petroleum hydrocarbon <br /> concentrations and the over-riding;,risk to worker safety, it has been determined that MW-7, <br /> MW-11M, and MW-11D will be sampled annually(first quarter) rather than semi-annually. <br /> 4493 Sampling Reduction Notifiication.doc 1 <br />