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fir' <br /> 6,ETTLER - RYAN <br /> INC. <br /> 4091 May 31, 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 Second Quarter Event of Apnl 18,2002 <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 by Gettler-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) <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 <br /> Groundwater samples were collected from the monitoring 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 i The <br /> chain of custody document and laboratory analytical reports are also attached <br /> Sincerely, <br /> e <br /> Deanna L Harding <br /> Project Coordinator <br /> Figure I 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 /> Field Data Sheets <br /> 4409gml Chain of Custody Document and Laboratory Analytical Reports <br /> I <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />