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w ETTLER - RYA N INC. <br /> April 30, 2002 <br /> G-R Job#180138 <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 March 20 and 21,2002 <br /> Groundwater Monitoring & Sampling Report <br /> Former Tosco(Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <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 <br /> hydrocarbons Separate-phase hydrocarbons were not present in the wells Static water level data and groundwater <br /> elevations are summarized in Table I A Potentiometric Map is included as Figure 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 1,2 and 3 A Concentration Map is included as Figure 2 <br /> The chain of custody document and laboratory analytical reports are also attached <br /> Sincerely, <br /> i <br /> Deanna L Harding <br /> Project Coordinator <br /> No 6882 <br /> Dou as e <br /> Senior Geo ogist,R G No 6882 <br /> 9TF O fi C <br /> Figure 1 Potentiometric Map <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 Groundwater Analytical Results <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 6981 qm] Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J Dublin , California 94568 { 925} 551 -7555 <br />