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1 <br /> 6ETTLER - RYAN INC. <br /> January 10, 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 Fourth 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 morutoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) On December 13, 1999, field personnel monitored and sampled seventeen wells (MW-10A, <br /> MW-10, MW-11, MW-12, MW-13, MW-14A, MW-14 through MW-18, MW-195, MW-19D, MW-215, <br /> MW-21D, MW-22S, MW-22D) and one irrigation well (Delta College) at the above referenced site In <br /> addition, Environmental Audit, Inc performed the scheduled joint monitoring at the Montgomery Ward Auto <br /> Service Center located on Pacific Avenue in 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 <br /> Figure 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 /> Sincerely, a <br /> D <br /> � <br /> anna L Harm � � J► <br /> g q� <br /> Project Coordinator <br /> Steph=Cart tP �t- <br /> Senior Geologist, R G No 5577 ' pF CAt1Fa�� <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 Operatmg Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> 3098 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />