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6ETTLER - RYAN INC. <br /> i <br /> March 23, 1999 <br /> G-R Job #280054 <br /> Mr Robert A Boust <br /> Unocal - DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE March Event 1999 Groundwater Monitoring &Sampling Report <br /> Former Unocal Service Station #2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Boust <br /> This report documents the groundwater monitoring and sampling event performed by Gettler-Ryan Inc (G-R) <br /> On March 12, 1999, field personnel monitored and sampled eleven wells (MW-1 through MW-10 and NPA) <br /> at the above referenced site <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 <br /> groundwater elevations are summarized in Table I Dissolved Oxygen Concentrations are summarized in Table <br /> 6 A Potentiometric Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells as specified by G-R Standard Operating <br /> Procedure - Groundwater Sampling (attached) The field data sheets are also attached The samples were <br /> analyzed by Sequoia Analytical Analytical results are summarized in Tables 1 through 4 A Concentration <br /> Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> Sincerely, <br /> r D GFO� <br /> Deanna L Harding <br /> Protect Coordinator 9� J'>► <br /> CO <br /> • No.5577 <br /> Stephen J Carter cf� Q- <br /> Senior Geologist, R G No 5577 <br /> FBF CAI-�F� <br /> 6747 Sierra Court , Suite J Dublin , California 94568 { 925 ) 551 - 7555 <br />