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6ETTLER - RYAN INC. <br /> July 7, 1999 <br /> G-R Job #280047 <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 #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 <br /> Inc (G-R) On June 14, 1999, field personnel monitored and sampled six wells (U-1 through U-6) at the <br /> 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 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 summai ized 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, kSD G�4 <br /> Deanna L Harding <br /> 2� <br /> Project Coordinators car <br /> �' . <br /> a,>� �' �.� c , No 6676 � <br /> Barbara Sieminski 9TFOF C�L,�O� <br /> Project Geologist, R G No 6676 <br /> Figure 1 Potentiometnc 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 (FPA Method 8010) <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> 0123 qmt <br /> 6 74 7 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />