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GETTLER - RYAN INC. <br /> August 26, 2002 <br /> Mr Edward C Ralston G-R Job#180238 <br /> Phillip 66 Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE: Third Quarter Event of July 11, 2002 <br /> Groundwater Monitoring& Sampling Report <br /> Former Tosco(Unocal) Service Station #4409 <br /> 1502 North El Dorado Street <br /> Stockton, California <br /> Dear Mr Ralston <br /> This report documents the most recent groundwater monitoring and sampling event performed byGettler-Ryan Inc (G- <br /> 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 event was conducted with Arco Service Station <br /> #4932, located at 16 East Harding Way, Stockton, California <br /> Static groundwater levels were measured and all wells at the referenced site were checked for the presence of separate- <br /> phase hydrocarbons Separate-phase hydrocarbons were not present in any of the wells Static water level data and <br /> groundwater elevations are summarized in Table 1 Potentiometric Maps are included as Figures 1 and 2 <br /> Groundwater samples were collected from the monitoring wells and submitted to a state certified laboratoryfor analyses <br /> yses <br /> The field data sheets for this event are attached Analytical results are presented in the table(s) listed below A <br /> Concentration Map is included as Figure 3 The chain of custody document and laboratory analytical reports are also <br /> attached <br /> erely, <br /> ' A ED G�0 <br /> Deanna L Harding ��S G SJ �Qc <br /> Project Coordinator <br /> No, 6882 <br /> Doug sJ Lee kj+x <br /> Senior Geologist,R G No 6882 yT�t7� CALF <br /> Figure 1 Potentiometnc Map-Shallow Zone <br /> Figure 2 Potentiometnc Map-Deep Zone <br /> Figure 3 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results-Oxygenate Compounds <br /> Table 3 Jomt Groundwater Monitoring Data and Analytical Results-Arco#4932 <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 4409 qmr Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J - Dublin , California 94568 (925 ) 551 - 7555 <br />