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y <br /> ;r <br /> � Y M <br /> 6ETTLER - RYAN INC. <br /> Gov] September 13, 1999 <br /> G-R rob #280054 <br /> Mr Robert A Boust <br /> Unocal - DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE Third Quarter 1999 Groundwater Monitoring & SampIing 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 August 19, 1999, field personnel monitored and sampled eleven wells (MW-1 through MW- <br /> 10 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 /> incerely, <br /> ('j, ' .�tiAED GEp <br /> eanna L a ing ,O <br /> Project Coordinator <br /> 9 <br /> No.5577 <br /> Stephen J Carter <br /> Senior Geologist, R G No 5577 tP <br /> Figure 1 Potentiometric Map OF CAL�F�P� <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results - Oxygenate Compounds <br /> Table 3 Groundwater Analytical Results <br /> Table 4 Groundwater Analytical Results <br /> Table 5 Groundwater Analytical Results - General Minerals <br /> Table 6 Dissolved Oxygen Concentrations <br /> Attachments Standard Operating Procedure -Groundwater Sampling <br /> Field Data Sheets <br /> 2859 qrol Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />