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Stantec <br /> Quarterly Status Summary Report Fourth Quarter 2011 <br /> Chevron and ARCO Commingled Plume No. CP0034 <br /> February 2, 2012 <br /> 1.0 INTRODUCTION <br /> Service Station No: Chevron Facility#9-4275 and ARCO Service Station No. 2133 <br /> Site Address: 2905 and 2908 West Benjamin Holt Drive, Stockton, California <br /> 95207 <br /> Contact: Ms. Stephanie McKenna Mr. Sergio Morescalchi <br /> Chevron Environmental Operations Project Manager <br /> Management Company Atlantic Richfield Company <br /> (Chevron) (ARC), a BP Affiliated Company <br /> 6101 Bollinger Canyon Road P.O. Box 1257 <br /> San Ramon, California 94583 San Ramon, California 94583 <br /> Consulting Company: Stantec Consulting Services Inc. — Mr. Brian Westhoff <br /> Stantec Project No.: 211602060.500.0002 <br /> Primary Agency/ Contact: San Joaquin County Environmental Health Department/ <br /> Ms. Lori Duncan <br /> A Site plan is included as Figure 1. No changes have been made to the previous investigations <br /> and site history since the last report submittal (Quarterly Groundwater Monitoring Report Third <br /> Quarter 2011, October 26, 2011). <br /> 2.0 SITE INFORMATION <br /> Current phase of project: Groundwater monitoring and sampling <br /> Chevron frequency of monitoring and Semi-annually(1Q/3Q): MW-2R and MW-5R <br /> sampling: Annually(1 Q): MW-1 R, MW-3R, MW-6, <br /> p g' MW-7R, MW-8, MW-9R, and MW-10 <br /> Semi-annually (1Q/3Q): E-3, E-4, E-6, E-9, <br /> and E-10 <br /> ARCO frequency of monitoring and sampling: Annually (1Q): E-2, E-5, E-11, E-12, PR-1, <br /> PR-2, BHD-2, MW-1, MW-2, MW-3, and <br /> MW-5 <br /> Have separate-phase hydrocarbons (SPH) No <br /> historically been found on-site?: <br /> Historic range in depth-to-water(DTW) <br /> ft below top of casing (TOC)from May 1989 to 3.92 PR-2 (1 Q98)to 22.19 E-11 (3Q91) <br /> July 2011: <br /> Two water supply wells 800 ft and 1,000 ft <br /> Water supply wells within a 2,000-foot radius southwest of the site. <br /> and their respective direction: The municipal well on the northeast corner of <br /> Ben Holt and Plymouth Road was <br /> decommissioned during summer of 2011. <br /> Current remediation technique: Natural attenuation <br /> 94275 QSSR 4Q11.doc 1 <br />