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�s <br /> GETTLER - RYAN INC. <br /> February 26, 1999 <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 Fourth Quarter 1998 Groundwater Monitoring &Sampling Report <br /> Former Unocal Service Station #5098 <br /> 5606 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Boust <br /> Tlus report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan Inc <br /> (G-R) On December 22, 1998, field personnel monitored and sampled eight wells (MW-10 through MW-17) <br /> at the above referenced site In addition, Environmental Audit, Inc performed the scheduled point monitoring <br /> at the Montgomery Ward Auto Service Center located on Pacific Avenue in Stockton, California, and the data <br /> is presented in Table 3 <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 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 <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 /> ncerely, <br /> Vea.�alHarding <br /> ;St&etp)he' <br /> Co rdmatoi; <br /> J Cart r <br /> Senior Geologist, R G No 5577 <br /> Figure 1 Potentiometric Map <br /> Fieure 2 Concentration Man <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 /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> 5096 qmi Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J e Dublin , California 94568 ( 925 ) 551 - 7555 <br />