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6ETTLER - RYAN INC. <br /> ugust 19, 1998 <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 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 June 18, 1998, field personnel monitored and sampled nine wells (MW-1 through MW-9) at the above <br /> 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 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 Dissolved Oxygen <br /> Concentrations are summarized in Table 5 A Concentration Map is included as Figure 2. The chain of custody <br /> document and laboratory analytical reports are also attached <br /> Sincerely, <br /> O�O <br /> Deanna L Harding t� ,SEN J Cq 0-1 i <br /> Prolect Manager <br /> No. 5577 <br /> Stephen J. Carter <br /> Senior Geologist, R G No 5577 <br /> Figure 1• Potentiometric Ma 9 CFCAUFOP� <br /> � P <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results <br /> Table 3 Groundwater Analytical Results <br /> Table 4 Groundwater Analytical Results - Oxygenate Compounds <br /> Table 5 Dissolved Oxygen Concentrations <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> 2859 qmi <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 } 551 - 7555 <br />