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S ECOR <br /> - --- - <br /> DATE: October 29 2007 1.� <br /> Quarterly Groundwater Monitoring Report <br /> Third Quarter 2007 <br /> Service Station No.: 6080 <br /> Site Address: 85 East Louise Avenue, Lathrop, California <br /> Mr. Sergio Morescalchi <br /> Environmental Business Manager <br /> Client Contact: Atlantic Richfield Company (ARC) <br /> P.O. Box 1257 <br /> San Ramon, California 94583 <br /> Consulting Company: SECOR International Incorporated (SECOR)—Mr. Rusty Benkosky <br /> SECOR Project No.: 77BP.06080.01.0436 <br /> Primary Agency 1 San Joaquin County Environmental Health Department 1 Ms. Lori 1 <br /> L.gontact: Duncan <br /> . i <br /> WORK PERFORMED THIS QUARTER [Third—2007] <br /> 1. SECOR submitted the Quarterly Groundwater Monitoring Report(QMR) Second Quarter s <br /> 2007 on July 25, 2007. <br /> 2. Groundwater monitoring and sampling activities were performed by Stratus i <br /> Environmental, Incorporated of Cameron Park, California (Stratus) on September 6, <br /> 2007. <br /> 3. SECOR submitted the Work Plan for Well Destruction on September 14, 2007. I <br /> WORK PROPOSED FOR NEXT QUARTER [Fourth—2007] <br /> 1. SECOR will submit the Quarterly Groundwater Monitoring Report Third Quarter 2007 <br /> (3Q07). <br /> 2. Well destruction will be performed by Stratus. <br /> DISCUSSION <br /> The site is currently operating as an ARCO service station with an AM/PM mini mart. Current <br /> site structures include three double-walled 12,000-gallon fiberglass underground storage tanks <br /> (USTs), two dispenser islands, and associated product lines. The majority of the subject <br /> property is comprised of paved asphalt and common landscaping. The site is bound to the i <br /> south by Louise Avenue, to the east by South Harlan Road, to the west by Interstate 5, and to <br /> the north by undeveloped land. According to the United State Geologic Survey Map dated <br /> 1999, the site is at an elevation of approximately 15 feet above mean sea level on flat terrain. <br /> The nearest open body of water is an irrigation canal approximately 1,500 feet west of the site. <br /> A site location map and site plan are included in Figures 1 and 2, respectively. Current and <br /> historical groundwater and analytical data are presented in Tables 1 through 3, and Figures 3, ' <br /> through 5. Well construction details are presented in Table 4. Previous investigations and a site i <br /> history summary are included in Attachment A. The current groundwater monitoring and I <br /> sampling data are summarized in the Stratus Groundwater Sampling Data Package, which is <br /> included in Attachment B. The certified laboratory analytical report, chain-of-custody <br /> documentation and the SECOR Lab Validation Form are presented in Attachment C. <br /> 6080 3Q07 QMR.doc SECOR Intemadonal Incorporated <br /> . J <br />