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f r� <br /> INC.6E - RY' ANN <br /> July 24, 2000 <br /> G-R Job#280047 <br /> Mr Robert A Boust <br /> Unocal-DBGIAMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE Second Quarter 2000 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 Inc <br /> (G-R) On June 19,2000,field personnel monitored and sampled six wells(U-1 through U-6) at the above referenced <br /> 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 Potentiometric 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 summarized in Tables 1 through 4 A Concentration Map is included as Figure 2 <br /> The chain of custody document and laboratory analytical reports are also attached <br /> Sincerely, <br /> 4 <br /> Deanna L Harding c,'(�REO GAO( <br /> roject Coordinator <br /> No. 6882 <br /> Doug1 J Lee <br /> Senior Geologist,R G No 6682 <br /> Figure 1 Potentiometric Map lFOF Op�1 O <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 />•, 01 23 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 -7555 <br />