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' Stantec Consulting Corporation <br /> L� 3017 Kilgore Road Suite 100 <br /> Rancho Cordova CA 95670 <br /> Tel:(916)861-0400 <br /> Fax: (916)861-0430 <br /> Stcl ftc <br /> January 6, 2010 <br /> Ms. Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95207 <br /> Reference: Well Destruction Summary Report <br /> Chevron 94275 and ARCO 2133 Commingled Plume <br /> 2905 and 2908 West Benjamin Holt Drive <br /> Stockton, California 95207 <br /> Commingled Plume Account No: CP0034 <br /> Dear Ms. Duncan: <br /> Stantec Consulting Corporation (Stantec) has prepared this well destruction summary report on <br /> behalf of Chevron Environmental Management Company (CEMC) and Atlantic Richfield Company <br /> (ARCO), a BP affiliated Company for the commingled plume at the Chevron Service Station 9-4275 <br /> and ARCO Service Station 2133. On December 3, 2007 SECOR International, Incorporated (now <br /> Stantec) submitted a Work Plan for Well Abandonment for groundwater monitoring wells E-7, E-8 <br /> and BHD-1 due to their location in roadways. Routine sampling of these wells presented a <br /> significant hazard to the people conducting the field work. In a letter dated January 2, 2008, the <br /> San Joaquin County Environmental Health Department (SJCEHD) approved the destruction of the <br /> wells with the provision that wells BHD-1 and E-8 be over drilled to depth, and all contents of the <br /> wells removed. Stantec requested that the wells be pressure grouted to surface during a verbal <br /> conversation with SJCEHD in December 2008 to avoid the hazards of over drilling in the street. <br /> The work, as requested, was approved by SJCEHD via email correspondence dated March 27, <br /> 2009. Regulatory correspondence is included as Attachment A. A summary of field activities is <br /> included below. <br /> SITE LOCATION <br /> Chevron Service Station 9-4275 and ARCO Service Station 2133 are located at 2905 and 2908 <br /> West Benjamin Holt Drive, respectively, in Stockton, California (Figure 1). Well BHD-1 was located <br /> in West Benjamin Holt Drive near the Chevron entrance, and wells E-7 and E-8 were located in <br /> Plymouth Road near the ARCO entrance (Figure 2). <br /> FIELD ACTIVITIES <br /> Prior to initiating field activities, Stantec obtained a well destruction permit from the SJCEHD and <br /> encroachment permits from both the City of Stockton Public Works Department (CSPWD) and the <br /> San Joaquin County Department of Public Works. Permits are included in Attachment B. Between <br /> November 9th and November 11, 2009, Stantec supervised Cascade Drilling, LP (Cascade) of <br /> Rancho Cordova, California as they destroyed three groundwater monitoring wells (BHD-1, E-7 and <br />