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First Semiannual 2012 Groundwater Monitoring Report <br /> Former Texaco Service Station <br /> Chevron Site ID 309075 <br /> June 21, 2012 <br /> 1.0 INTRODUCTION <br /> V <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 /> Mr. Brett Krehbiel <br /> Consulting Company: ARCADIS U.S., Inc. <br /> 950 Glenn Drive, Suite 125 <br /> Folsom, California 95630 <br /> Project No.: B0046980.0002 <br /> Primary Agency/Contact: San Joaquin County Environmental Health Department <br /> Ms. Lisa Medina <br /> ARCADIS, on behalf of Chevron Environmental Management Company (Chevron), has <br /> prepared this First Semiannual 2012 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 /> Current phase of project: Phase B <br /> Chevron frequency of monitoring and Monitored and sampled semiannually <br /> sampling: <br /> Have separate-phase hydrocarbons(SPH) <br /> historical) been found on-site? No <br /> Historic range in depth-to-water(DTW) <br /> feet(ft) below top of casing (TOC)from 48.68—67.82 <br /> August 20061 to April 2012: <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 /> 'Monitoring during the third and fourth quarters of 2006 was only performed at MW-1. Monitoring was not performed <br /> between the first quarter of 2007 and the second quarter of 2008, inclusive. <br /> g:\aproject\env\chevron\309075\6 deliverableslpedodic monitoring\2012Nsa12\text\3090751sa12 gmrfin 06212012.doc 1 <br /> r <br />