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� [f <br /> INC. <br /> 6ETTLER - RYAN 1V <br /> September 13, 2002 <br /> G-R Job#180137 <br /> Mr Edward C Ralston <br /> Phillips 66 Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE: Third Quarter Event of August I and 2, 2002 <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 most recent groundwater monitoring and sampling event performed by Gettler-Ryan Inc <br /> (G-R) at the referenced site All fieldwork was conducted in accordance with G-R Standard Operating Procedure- <br /> 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 l A Potentiometric Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells and submitted to a state certified laboratory for <br /> analyses The field data sheets for this event are attached Analytical results are presented in the table(s)listed below <br /> A Concentration Map is included as Figure 2 The chain of custody document and laboratory analytical reports are <br /> also attached <br /> Sincerely, <br /> i <br /> Deanna L Harding <br /> Protect Coordinator <br /> NU C?882 <br /> Douglas J e <br /> Senior Geologist, R G No 6882 4lcc0F <br /> Figure 1 Potentiometric Map-Shallow Zone <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results-Oxygenate Compounds <br /> Attachments Standard Operating Procedure- Groundwater Sampling <br /> . <br /> Field Data Sheets <br /> 5886 qmi Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 } 551 - 7555 <br />