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GETTLER - RYAN INC. <br /> June 10, 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 Second Quarter 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 quarterly groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) On May 24, 1999, field personnel monitored and sampled eleven wells (MW-1 through MW-10 <br /> and NP-1) 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 1 Dissolved Oxygen Concentrations are summarized in <br /> Table 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 <br /> attached <br /> Sincerely, <br /> D1 G <br /> Deanna L Harding t�,� Q�EN s•C,�9��'�'� <br /> Project Coordinator Q CO—J&III. F9 <br /> � No.5577 <br /> /t4 Stephen J Carter ��9r Q1+1 <br /> Senior Geologist, R G No 5577 FOF CAL�F� <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />