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ti <br /> 6ETTLER - RYAN N <br /> c. <br /> oia July 19, 2000 <br /> G-R Job#280045 <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 2000 Groundwater Monitoring& Sampling Report <br /> Former Unocal Service Station#0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> Dear Mr Boust <br /> This report documents the quarterly groundwater monitoring and sampling and well development events performed <br /> by Gettler-Ryan Inc (G-R) On May 30 and 31,2000,field personnel monitored sixteen wells(U-1 through U-9, UV- <br /> 1,NP-1-22,NP-1-65,NP-1-111,NP-2-22,NP-2-60, and NP-2-116)and sampled fifteen wells(U-1 through U-9,NP- <br /> 1-22, NP-1-65, NP-1-111, NP-2-22, NP-2-60, and NP-2-116)at the above referenced site On June 7, 2000, field <br /> personnel developed, monitored and sampled four wells(U-10 through U-13) 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 Potentiometnc 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 5 A Concentration Map is included as Figure 2 <br /> Chain of custody documents and laboratory analytical reports are also attached <br /> ncerely, <br /> Deanna L Harding �4i `�,EN Cq,9� �'�'�► <br /> Protect Coordinator <br /> No.5577 <br /> Stephen J Carter <br /> Senior Geologist, R G No 5577 r�EOF CAL�FO <br /> Figure l Potentiometric Map <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 <br /> ttachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> arra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />