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1 , <br /> 6E TL ER - RYAN INC. <br /> February 16, 1999 <br /> G-R Job#280054 <br /> Mr Robert A Boust <br /> Unocal-DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RF First Quarter 1999 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 development and quarterly groundwater monitoring and sampling events performed <br /> by Gettler-Ryan Inc (G-R) On February 1, 1999, field personnel developed two wells (MW-10 and NP-1) <br /> ' and morutored (during development) one well (MW-2) On February 4, 1999, field personnel monitored and <br /> sampled eleven wells (MW-1 through MW-10 and 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 in Table <br /> 6 A Potentiometnc Map is included as Figure I <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 I through 4 A Concentration <br /> Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> S rely, <br /> ' eanna L Harding `5.����0 GFGIO <br /> Protect Coordinator <br /> �9 <br /> No 5577 <br /> Stephen J Carter tP <br /> ' Senior Geologist,R G No 5577 <br /> FOF Cpllf� <br /> i <br /> 6747 Sierra Court, Suite J Dublin, California 94568 (925) 551 -7555 <br />