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3 1 C. <br /> (7ETTLER - RYAN N <br /> Oki June 25, 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 Second Quarter Event of May 13 and 14, 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 Ievel data and groundwater elevations are <br /> summarized in Table 1 Dissolved Oxygen Concentrations are summarized in Table 6 Potentiometne 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 laboratory analytical report are also <br /> attached <br /> Si erely, <br /> r <br /> Deanna L Harding <br /> Protect Coordinator QPpFESS/pN <br /> q� <br /> KEFCO <br /> �o �2 <br /> Hagp <br /> o Kevork - z <br /> LU No C 55734 rmn <br /> P E No C55734 Cr_ Exp <br /> Figure 1 Potentiometric Map(Zone A) <br /> Figure 2 Potentiometric Map(Zone 13) tp \� <br /> Figure 3 Concentration Map '9TE CIVIC- Q� <br /> Table I Groundwater Monitoring Data and Analytical Results OF C A0 <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 qmt Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />