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6E TTLER RYA l <br /> September 28, 2001 ` <br /> G-R Job#180198 <br /> Mr. Edward C. Ralston 'S <br /> Tosco Marketing Company <br /> III <br /> 1380 Lead Hill Road, Suite 120 'I 1 <br /> Roseville, California 95661 <br /> II3 <br /> i� <br /> RE: Third Quarter Event of August 22,2001 <br /> Groundwater Monitoring & Sampling Report: <br /> Tosco (Circle K) Unit#08671 <br /> 8606 Thornton Road <br /> Stockton, California L <br /> Dear Mr. Ralston: <br /> I. <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler-Ryan Inc. <br /> (G-R) at the referenced site. All field work was conducted in accordance with G-R Standard Operating Procedure <br /> - Groundwater Sampling (attached). A joint groundwater monitoring was performed with North Stockton Auto <br /> Center, located at 8709 North Davis Road, Stockton, California. <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase hydrocarbons. <br /> Separate-phase h hydrocarbons were not resent in the wells. Static water level data and groundwater elevations are <br /> Y p <br /> summarized in Table 1. Joint groundwater monitoring data and analytical is presented in Table 3. A Potentiometric <br /> Ma is included as Figure 1. <br /> Map g <br /> I <br /> i }f <br /> } <br /> Groundwater samples were collected from the monitoring wells as specified by G-R Standard Operating Procedure <br /> II - Groundwater Sampling (attached). The field data sheets are also attached. The samples were analyzed by Sequoia <br /> Analytical. Analytical results are summarized in Tables l and 2. A Concentration Map is included as Figure 2. The <br /> chain of custody document and laboratory analytical reports are al!so attached. <br /> j <br /> Sincerely, <br /> I <br /> • i <br /> .t-it�sC. s t <br /> ED Getl it - <br /> 4 " 1 <br /> Deanna L. Hardin- <br /> Project <br /> ardingPro ect Coordinator s I. <br /> No. 6882 <br /> Douglas J. Lee <br /> Senior Geologist, R.G. No. 6882 OF CA�,Fp4' <br /> Figure 1: Potentiometric Map <br /> Figure 2: Concentration Map <br /> Table 1: Groundwater Monitoring Data and Analytical Results` <br /> Table 2: Groundwater Analytical Results-Oxygenate Compounds <br /> Table 3: Joint Groundwater Monitoring Data and Analytical Results <br /> Attachments: Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> fl8fill.y I <br /> 6747 Serra Court , Suite J Dublin , California 94568 • . ( 925 } 551 - 7555 <br />