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fET TL ER - INC.YAN <br /> June 6, 2001 <br /> G-R Job#180137 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville,California 95661 <br /> RE Second Quarter Event of May 7 and 8,2001 <br /> Groundwater Monitoring& Sampling Report <br /> Tosco(Unocal)Service Station #5886 <br /> 2701 West March Lane <br /> Stockton, California <br /> Dear Mr Ralston <br /> This report documents the monthly site visit 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) <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 A Potentiometric Map is included as Figure I <br /> Groundwater samples were collected from the monitoring wells as specified by 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 /> Si erely, <br /> Deanna L Harding RE0 <br /> Project Coordinator <br /> O <br /> No. 6882 <br /> Dougla J ee <br /> Senior Geologist, R G No 6882 lF OF CALF <br /> Figure 1 Potentiometric Map- Shallow Zone <br /> Figure 2 Concentration Map <br /> Table I Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results- Oxygenate Compounds <br /> . Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 5886gmi Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 (925 ) 551 - 7555 <br />