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GETTLER - RYAN INC. <br /> -4ig March 26, 2002 <br /> G-R Job#180198 <br /> Mr Edward C Ralston <br /> Phillips 66 Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE: First Quarter Event of February 12, 2002 <br /> Groundwater Monitoring &Sampling Report <br /> Tosco (Circle K) Unit#08671 <br /> 8606 Thornton Road <br /> Stockton,California <br /> Dear Mr Ralston <br /> This report documents the monthly site visits and the most recent groundwater monitoring and sampling event <br /> performed by Gettler-Ryan Inc (G-R)at the referenced site All field work was conducted in accordance with G-R <br /> Standard Operating Procedure - Groundwater Sampling (attached) Joint groundwater monitoring has been <br /> discontinued with North Stockton Auto 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 hydrocarbons were not present in the wells Static water level data and groundwater elevations are <br /> summarized in Table 1 Joint groundwater monitoring and analytical data are presented in Table 3 A Potentiometnc <br /> Map is included as Figure 1 <br /> Groundwater samples were collected from the monitonng wells as specified by G-R Standard Operating Procedure- <br /> Groundwater Sampling (attached) The field data sheets are also attached The samples were analyzed by Sequoia <br /> Analytical Analytical results are summarized in Tables 1 and 2 A Concentration Map is included as Figure 2 The <br /> chain of custody document and laboratory analytical reports are also attached <br /> Sincerely, <br /> Via., <br /> Deanna L HardingG <br /> \SO <br /> Project Coordinator v G1A& / ) <br /> No. U82 <br /> Dougl \eo <br /> ee <br /> Senior gist, R G No 6882 0�y <br /> O� <br /> Figure 1 Potentiometric Map C <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 /> 09671 ymi <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 { 925 ) 551 - 7555 <br />