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r`' 7 <br /> 6ETTLER - RYAN INC. <br /> July 20, 2000 <br /> G-R Job#280046 <br /> Mr Robert A Boust <br /> Unocal -DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE Senn Annual 2000 Groundwater Monitoring&Sampling Report <br /> Former Unocal Service Station#5098 <br /> 5606 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Boust <br /> This report documents the semi annual groundwater monitoring and sampling event performed by Gettler-Ryan Inc <br /> (G-R) On June 15, 2000,field personnel monitored and sampled seventeen wells (MW-10A,MW-10,MW-11,MW- <br /> 12,MW-13,MW-14A,MW-14 through MW-18,MW-19S,MW-19D,MW-21S,MW-21D,MW-22S,and MW-22D) <br /> at the above referenced site A joint groundwater monitoring and sampling event was conducted with Montgomery <br /> Ward Auto Service Center located on Pacific Avenue, Stockton, California <br /> Static groundwater levels were measured and all wells at the referenced site were checked for the presence of separate- <br /> phase hydrocarbons Separate-phase hydrocarbons were not present in any of 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 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 and 2 A Concentration Map is included as Figure 2 The <br /> chain of custody document and laboratory analytical reports are also attached <br /> Zaean"naH <br /> erely, ,Q� <br /> D GEC <br /> ng ��`�vG1�S J <br /> Project Coordinator <br /> No 6882 <br /> \.V <br /> Dou las Lee , . <br /> Senior Geologist, R G No 6882 d, <br /> Figure 1 Potentiometric Map �9rEoF <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 Joint Groundwater Monitoring Data and Analytical Results <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 5099 qm] Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 -7555 <br />