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{ <br /> f' �S <br /> Stantec Consulting Inc. i <br /> 3017 Kilgore Road,Suite 100 <br /> Rancho Cordova,CA 95670 <br /> Tel:(916)861-0400 <br /> Fax:(916)861-0430 <br /> StantecDD <br /> ED <br /> April 1, 2009 2009 <br /> E <br /> Ms. Lori Duncan ENV/Fii1►Mwf HEALTH <br /> San Joaquin County Environmental <br /> Health Department v?11IS RViC S <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Reference: Sampling Reduction Notification <br /> Former ARCO Service Station No. 548 <br /> 1612 West Hammer Lane <br /> Stockton, California 95210 <br /> Stantec No.: 211601008.201.522 <br /> Dear Ms. Duncan: <br /> On behalf of Atlantic Richfield Company (ARC), a BP Affiliated Company, Stantec Consulting <br /> Corporation (Stantec) has prepared this letter for former ARCO Service Station No. 548 (site)to <br /> minimize the safety hazards for the groundwater sampling technicians while performing work at <br /> the site. i. <br /> I Recently, during a routine groundwater sampling event at a lite in!I�Southern California, a traffic <br /> i 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}havel,rdecided to eliminate and/or <br /> reduce the sample frequency for wells in or near roadways. <br /> F .E <br /> There are currently two high-risk well locations at the site (Attachment B).- These wells include <br /> MW-6 and MW-7 (both of which are located on Brentwood Drive), "which are currently sampled <br /> on a quarterly basis. A review of historical data (Attachment C) shows that groundwater <br /> analytical concentrations have been low to non-detect since February 15, 1995 in MW-6 and <br /> since December 13, 2004 in MW-7. In addition to the low to non-detect concentrations, active <br /> air sparging has been performed at the site since August 24, 2007. Based on the low to non- <br /> detect petroleum hydrocarbon concentrations, remedial activities, and the over-riding risk to <br /> worker safety, it has been determined that MW-6 and MVI!-7 will be sampled annually (first <br /> quarter) rather than quarterly. <br /> 548 Sampling Reduction Notification.doc „ 1 <br />