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u <br /> GETTLER - RYAN INC. <br /> OF] September 28, 2001 <br /> G-R Job#280054 <br /> Mr Nick Nickerson <br /> Unocal - DBG/AMG <br /> 8788 Elk Grove Boulevard <br /> Building 3, Suite 15 <br /> Elk Grove, California 95624 <br /> RE Third Quarter Event of August 16 and 17, 2001 <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 as specified by G-R Standard Operating Procedure <br /> -Groundwater Sampling (attached) The field data sheets are also attached The samples were analyzed by Sequoia <br /> Analytical Analytical results are summarized in Tables l through 5 A Concentration Map is included as Figure 3 <br /> The chain of custody document and laboratory analytical reports are also attached <br /> Sincerely, <br /> r-OR <br /> Deanna L Harding jkED GE <br /> Project Coordinator ��;�4oUG1.AS J <br /> No 8882 <br /> Dougl J e L5 <br /> Senior Geologist, R G No 6882 CA <br /> Figure I Potentiometric Map(Zone A) <br /> Figure 2 Potentiometric Map(Zone B) <br /> Figure 3 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> TabJe 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 qml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />