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V3 6ETTLER - RYAN INC. <br /> April 24,2000 <br /> G-R Jab#280047 <br /> � p- <br /> Mr Robert A Boust - <br /> Unocal-DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 -�= <br /> RE Fust Quarter 2000 Groundwater Monitoring& Sampling Report w r ' <br /> Former Unocal Service Station#0123 <br /> 1034 Central Avenue <br /> Tracy,California <br /> Dear Mr Boust <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan Inc (G R) <br /> On March 16, 2000,field personnel monitored and sampled six wells (U-1 through U-6) at the above referenced site <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase hydrocarbons <br /> Separate-phase hydrocarbons were not present in the wells Static water level data and groundwater elevations are <br /> summarized in Table 1 A Potentlometnc Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells as specified by G-R Standard Operating Procedure - <br /> Groundwater Sampling (attached) The field data sheets are also attached The samples were analyzed by Sequoia <br /> Analytical Analytical results are surnmanzed in Tables 1 through 4 A Concentration Map is included as Figure 2 <br /> The chain of custody document and laboratory analytical reports is also attached <br /> cerely, <br /> annHarding <br /> Protect Coordinator ,� '9% <br /> No.5577 <br /> Stephen J Carter qP �! <br /> Senior Geologist,R G No 5577 DF CAL�F�P� <br /> Figure 1 Potenttometric 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 -Oxygenate Compounds <br /> Table 4 Groundwater Analytical Results(EPA Method 8010) <br /> Attachments Standard Operating Procedure- Groundwater Sampling Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> m23qud <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />