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AEGIS ENVIRONMENTAL , INC <br /> 1050 Melody Lane, Suite 160, Roseville, CA 95678 ♦ 916. 782-2110 1 916-969-2110/FAX 916.786-7830 <br /> December 15, 1992 <br /> Mr Dan Kirk CID <br /> Shell Oil Company �1=' `" ' W <br /> Post Office BOX 5278 r� <br /> Concord, California 94520 <br /> LLI <br /> Subject Quarterly Groundwater Monitoring Report ; c <br /> Shell Service Station (WIC No 204-7525-0104) w <br /> 6131 Pacific Avenue, Stockton, California ==' v C�' <br /> • Dear Mr Kirk <br /> Aegis Environmental, Inc (Aegis), is pleased to provide Shell Oil Company (Shell) the <br /> attached Information documenting the results of quarterly groundwater monitoring <br /> conducted on October 15, 1992, at the subject site The monitoring was conducted by <br /> Emcon Associates, of Sacramento, California <br /> Aegis plans to conduct quarterly monitoring and sampling at the site in January 1993 <br /> The sampling will Include purging at least three wetted-casing volumes of groundwater <br /> from each of the three wells on site Temperature, conductivity, pH, and turbidity will be <br /> measured for groundwater stability prior to sampling Upon authorization, a subsurface <br /> Investigation Is to be conducted in the Immediate area of the site The Investigation may <br /> Include off-site monitoring well(s) pending right-of-entry and/or encroachment approval <br /> The Interpretations and conclusions contained within this report represent our professional <br /> opinions These opinions are based on currently available Information, and were <br /> ueveivped in accordance with acceptea geologic, nydrogeoiogic, anti engineering <br /> practices for this time and for this specific site Other than this, no warranty is Implied or <br /> Intended <br /> This report has been prepared solely for the use of Shell Oil Company Any reliance on <br /> this report by third parties shall be at such parties' sole risk This report was prepared <br /> l under the direct supervision of the professional geologist, registered with the state of <br /> California, whose signature appears below <br /> 90-020D 4MR <br /> GEOLOGISTS - ENGINEERS - GROUNDWATER SCIENTISTS <br />