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1 , <br /> GETTLER - RYAN N <br /> October 28, 1998 <br /> G-R Job#280054 <br /> Mr Robert A Boust <br /> Unocal - DBGIAMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> �I k <br /> f r ; <br /> Fly <br /> RE Groundwater Momtonng & 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 August 31, 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 Dissolved Oxygen Concentrations are summarized in Table <br /> 5 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 /> Si <br /> erely, <br /> )lla-A /_ ��jkED Geo Z <br /> GSH gO <br /> v` G�`{ L <br /> Protect Coordinator <br /> 4SP <br /> � No 8 '28Carter <br /> eologist, R G No 5577 `�q�. Of CA������`� <br /> Figure 1 Potentiometric Map <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 /> 0 Table 4 Groundwater Analytical Results - Oxygenate Compounds <br /> Table 5 Dissolved Oxygen Concentrations <br /> yg <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> 2859 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 -7555 <br />