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Stantec Consulting Corporation <br /> cl� <br /> 3017 Kilgore Road Suite 100 <br /> Rancho Cordova CA 95670 <br /> Tel:(916)861-0400 <br /> Fax:(916)861-0430 <br /> Stantec <br /> DATE: November 28, 2011 <br /> 7-ELEVEN, INC. QUARTERLY REPORT <br /> Store Number: 7-Eleven Store#14117 <br /> Site Address: 2725 Country Club Boulevard, Stockton, CA <br /> 7-Eleven Contact: Mr. Jose Rios <br /> Consulting Company: Stantec Consulting Corporation—Mr. Damon Brown <br /> Stantec Project No.: 211501013.220.0518 <br /> Primary Agency: San Joaquin County Environmental Health Department <br /> (SJCEHD) <br /> WORK PERFORMED THIS QUARTER[Third—2011] <br /> 1. Conducted quarterly groundwater monitoring and sampling on August 15, 2011, and generated the <br /> quarterly report. <br /> 2. Conducted periodic oxygen injection into onsite wells. <br /> WORK PROPOSED FOR NEXT QUARTER[Fourth—2011] <br /> 1. Perform quarterly monitoring and sampling during fourth quarter 2011, and prepare the quarterly <br /> report. <br /> 2. Continue oxygen injection on a biweekly basis. <br /> 3. Generate site closure evaluation report for submittal to the SJCEHD. <br /> DISCUSSION <br /> The site is a 7-Eleven convenience store and gas station (Figures 1 and 2). 'Underground storage <br /> tanks (USTs) at the site were replaced in July 1998. Monitoring and sampling has been conducted <br /> at the site since the third quarter of 1999. The current groundwater monitoring and sampling data <br /> are summarized in Table 1, and presented on Figures 2 and 3. Historical groundwater monitoring <br /> and sampling results are summarized in Table 2. The well completion details are summarized in <br /> Table 3. An active USA Gasoline(former Exxon) service station is located east of the site. <br /> I <br /> Current Site Information <br /> Current Phase of Project: Groundwater Monitoring and <br /> Remediation <br /> Frequency of Monitoring and Sampling: Quarterly, Eight wells- MW-1 through <br /> MW-8 <br /> Are Liquid Phase Hydrocarbons Present On-site: No <br /> Water Supply Wells within a 2,000-foot radius and 11 domestic wells in various <br /> their Respective Direction: directions; nearest is 400 feet north- <br /> northwest. <br /> Current Remediation Techniques: Oxygen injection_ <br /> 14117 11-3Q Report.doc <br />