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IgETTLER - RYAN INC. <br /> March 16, 2000 <br /> G-R.Job #280054 <br /> Mr Robert A Boust <br /> Unocal -DBGIAMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE First Quarter 2000 Groundwater Monitoring & Sampling Report <br /> Former Unocal Service Station#2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Boust <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan Inc <br /> (G-R) On February 17,2000,field personnel monitored and sampled eleven wells(MW-1 through MW-10 and <br /> NP-1) at the above referenced site <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase <br /> hydrocarbons Separate-phase hydrocarbons were not present in the wells Static water level data and <br /> groundwater elevations are summarized in Table 1 Dissolved Oxygen Concentrations are summarized m Table <br /> 6 A Potentiometnc Map is included as 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 through 4 A Concentration Map <br /> is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> in erely, -- <br /> �5��000,0, <br /> Deanna L Harding �Ca SEN J.Cq 0,Project Coordinator ,`� '9 `f',► <br /> J <br /> No.5577 <br /> Stephen Carter <br /> F <br /> Senior Geologispn RG No 5577 <br /> � <br /> etnc Ma <br /> Figure ° t° p OF CAL1F <br /> Figure 2 Concentration Map <br /> Table l Groundwater Monitoring 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 /> 2959gm1 Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 ( 925 ) 551 - 7555 <br />