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C. <br /> 411 GETTLER - RYAN IN <br /> December 16, 2002 <br /> G-R Job#280054 <br /> Mr Nick Nickerson <br /> Union Oil Company of California <br /> 8788 Elk Grove Boulevard <br /> Building 3, Suite 15 <br /> Elk Grove, California 95624 <br /> RE: Fourth Quarter Event of November 7,8, and 9,2002 <br /> Groundwater Monitoring& Sampling Report <br /> Former Unocal Service Station#2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Nickerson <br /> This report documents the most recent quarterly groundwater monitoring and sampling event performed by Gettler- <br /> Ryan Inc (G-R) All field work was conducted in accordance with G-R Standard Operating Procedure-Groundwater <br /> Sampling(attached) <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase hydrocarbons <br /> Separate-phase hydrocarbons were not present in the wells Static water level data and groundwater elevations are <br /> summarized in Table 1 Dissolved Oxygen Concentrations are summarized in Table 6 Potentiometric Maps are <br /> included as Figures 1 and 2 <br /> Groundwater samples were collected from the monitoring wells and submitted to a state certified laboratory for <br /> analyses The field data sheets for this event are attached Analytical results are presented in the table(s)listed below <br /> A Concentration Map is included as Figure 3 The chain of custody document and Iaboratory analytical report are also <br /> attached <br /> Sincerely, <br /> I � <br /> - <br /> FOP- <br /> Deanna <br /> OrtDeanna L Harding <br /> Project Coordinator Ica��,� <br /> /X <br /> o � <br /> �r Na 7285 �k <br /> Robert C Mallory clj Exp ct aQ, <br /> Registered Geologist,No 7285 OF CAL��� <br /> Figure 1 Potcntiometric Map(Zone A) <br /> Figure 2 Potcntiometnc Map(Zone B) <br /> Figure 3 Concentration Map <br /> Table 1 Groundwater Monitonng Data and Analytical Results <br /> Table 2 Groundwater Analytical Results-Oxygenate Compounds <br /> Table 3 Groundwater Analytical Results <br /> • Table 4 Groundwater Analytical Results <br /> Table 5 Groundwater Analytical Results-General Minerals <br /> Table 6 Dissolved Oxygen Concentrations <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 2859 qmi Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 -7555 <br />