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Second Semiannuai2010 roundwaterMonitoring Report <br /> Former Texaco Service Station <br /> Chevron Site ID 309075 <br /> November 22, 2011 <br /> V <br /> 1.0 INTRODUCTION <br /> Service Station No: Former Texaco Service Station, also known as <br /> Chevron Site ID 309075 <br /> Site Address: 3978 South Highway 99 <br /> Stockton, California <br /> Ms. Stephanie McKenna <br /> Contact: Chevron Environmental Management Company <br /> 6101 Bollinger Canyon Road, Room No. 5321 <br /> San Ramon, California 94583 <br /> Ms. Sherrie Lang <br /> Consulting Company: ARCADIS U.S., Inc. <br /> 950 Glenn Drive, Suite 125 <br /> Folsom, California 95630 <br /> Project No.: B0046980.0001 <br /> Primary Agency / Contact: San Joaquin County Environmental Health Department <br /> Ms. Lori Duncan <br /> ARCADIS, on behalf of Chevron Environmental Management Company (Chevron), has <br /> prepared this First Semiannual 2011 Groundwater Monitoring Report to document the results of <br /> groundwater monitoring and sampling at the former Texaco service station, also known as <br /> Chevron Site ID 309075, located at 3978 South Highway 99 in Stockton, California (Figure 1). <br /> 2.0 SITE INFORMATION <br /> V <br /> Current phase of project: Phase B <br /> Chevron frequency of monitoring and Monitored and sampled semiannually <br /> sampling: <br /> Have separate-phase hydrocarbons (SPH) No <br /> historically been found on-site? <br /> Historic range in depth-to-water (DTW) <br /> feet (ft) below top of casing (TOC)from 51.05—67.82 <br /> August 2006 to April 20111: <br /> Water supply wells within a 2,000 ft radius and E: 01 N07E20G001 M (California Department <br /> their respective direction: of Water Resources, 2011 <br /> Current remediation technique: Monitored natural attenuation <br /> Note: <br /> 1 Monitoring was not performed between the first quarter of 2007 and the second quarter of 2008, inclusive. <br /> A summary of the site history and previous investigations is included in Attachment A. <br /> g:\aproject\env\chevron\309075\6 deliverables\periodic monitoring\2011\1sa11\temp pdf\text\309075 1sa11 gmr fin 11222011.doc 1 <br /> r <br />