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6ETTLER - RYANINc- <br /> .} <br /> March 26, 2003 <br /> 1, 3 <br /> G-R Job#180137 <br /> Mr Edward C Ralston <br /> } ConocoPhillips <br /> 76 Broadway <br /> Sacramento, California 95818 <br /> RE First Quarter Event of February 20 and 21, 2003 <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 I 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 /> Since , <br /> Deanna L Harding � N J <br /> Project Coordinator ` <br /> * N0.5577 <br /> /d <br /> Stephen J Carter OF CA1-� � <br /> Senior Geologist,R G No 5577 <br /> Figure 1 Potentiometne Map- Shallow Zone <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Momtonng Data and Analytical Results <br /> Table 2 Groundwater Analytical Results-Oxygenate Compounds <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 5896gml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J - Dublin , California 94568 ( 925 ) 551 - 7555 <br />