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T -- <br /> h <br /> GETTLER - RYAN NC. <br /> October 29, 1998 <br /> Mr Robert A. Boust G-R Job #280046 <br /> Unocal - DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE Quarterly 1998 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 quarterly groundwater monitoring and sampling event performed by Gettler-Ryan Inc <br /> (G-R) On September 15, 1998, field personnel monitored and sampled eight wells (MW-10 through MW-17) <br /> at the above referenced site At the request and in the presence of San Joaquin County personnel, the G-R field <br /> technician monitored seven wells (MW-1 through MW-7) located at the Montgomery Ward Auto Service Center <br /> Also, one irrigation well located at Delta College adjacent to the referenced site was sampled <br /> In addition, Environmental Audit, Inc performed the scheduled point monitoring at the Montgomery Ward Auto <br /> Service Center located on Pacific Avenue in Stockton, California, and the data is presented in Table 3 The <br /> monitoring of the Montgomery Ward wells by G-R and Environmental Audit, Inc were performed at different <br /> times during the day The data from both monitoring events are summarized in Table 4 <br /> 1 <br /> Static groundwater levels were measured and all wells at the referenced site were checked for the presence of <br /> separate-phase hydrocarbons Separate-phase hydrocarbons were not present in any of the wells Static water level <br /> data and groundwater elevations are summarized in Table I 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 <br /> Sequoia Analytical Analytical results are summarized in Tables 1 and 2 A Concentration Map is included as <br /> Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> i cerely, �W fED GFp�Q <br /> a L ar mg cr <br /> Prod �r��,d�� No 6728 �r <br /> ��i�erTo C arter' " <br /> Sem Geologist, R G No 5577 <br /> OF CA���`O <br /> Figure 1 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 Joint Groundwater Monitoring and Analytical Results <br /> Table 4 Joint Groundwater Monitoring Data Timetable <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> 5098 qM1 Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />