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I C. <br /> 4916ETTLER - YA IV IV <br /> April 4, 2003 <br /> G-R Job #280054 <br /> Pagel of 2 <br /> Mr Nick Nickerson <br /> Union Oil Company of California <br /> 8788 Elk Grove Boulevard <br /> Building 3, Suite 15 <br /> Elk Grove, California 95624 <br /> RE. First Quarter Event of February 27 and 28, 2003 <br /> Groundwater Monitoring& Sampling Report <br /> Former Unocal Service Station#2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Nickerson <br /> This report documents the most recent quarterly groundwater monitoring and sampling event performed by Gettler- <br /> Ryan Inc (G-R) All field work was conducted in accordance with G-R Standard Operating Procedure-Groundwater <br /> 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 1 Dissolved Oxygen Concentrations are summarized in Table 6 Potentiometric Maps are <br /> included as Figures 1 and 2 <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 3 The chain of custody document and laboratory analytical report are also <br /> attached <br /> S rely, <br /> Deanna L Harding <br /> Project Coordinator <br /> QRQF E SS/O <br /> CO <br /> Hagop KevorkCD <br /> P E No C55734 cc No C 55734 ,rr; <br /> Exp I <br /> (P�9TF CIVIL <br /> OF CAI- <br /> 6747 <br /> AL6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />