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1 <br /> 6ETTLER - RYAN NC. <br /> July 6, 1999 <br /> iM <br /> Robert A. Boost G-R Job #280046 <br /> Unocal - DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE Second Quarter 1999 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 GettIer-Ryan <br /> Inc (G-R) On June 17, 1999, field personnel monitored and sampled seventeen wells (MW-10A, MW-10 <br /> MW-11, MW-12, MW-13, MW-14A, MW-14 through MW-18, MW-19D MW-19S. MW-21D, MW-21S, <br /> MW-22D, and MW-22S) at the above referenced site In addition, Environmental Audit, Inc performed the <br /> scheduled Joint monitoring at the Montgomery Ward Auto Service Center located on Pacific Avenue in <br /> Stockton, California, and the data 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 <br /> level data and groundwater elevations are summarized in Table 1 A Potentiometric Map is included as Figure <br /> 1 <br /> Groundwater samples were collected from the monitoring wells as specified by G-R Standard Operating <br /> Procedure - Groundwater Sampling (attached) The field data sheets are also attached The samples were <br /> analyzed by Sequoia Analytical Analytical results are summarized in Tables 1 and 2 A Concentration Map <br /> is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached <br />' S erely, <br /> 5 S �O <br /> Deanna L Harding <br /> Project Coordinator ` cc IT 'L� <br /> No 6676 <br /> Barbara Sieminski <br /> Project Geologist, R G No 6676 tel' L,FOQ` <br /> FQ% Cra <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 Data and Analytical Results <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> 5W8 qi Chain of Custody Document and Laboratory Analytical RePOOs <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7f363 <br />