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i AEGIS ENVIRONMENTAL , INC . <br /> 1050 Melody Lane, Suite 160, Roseville, CA 95678 + 916. 782-21101916.969-2110/FAX 916.786-7830 <br /> March 10, 1993 <br /> Mr Dan Kirk <br /> Shell Oil Company <br /> Post Office Box 5278 <br /> Concord, California 94520 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Shell Service Station (WIC No 204-7525-0104) <br /> . 6131 Pacific Avenue, Stockton, California <br /> Dear Mr Kirk <br /> Aegis Environmental, Inc (Aegis), is pleased to provide Shell Oil Company the attached <br /> information documenting the results of quarterly groundwater monitoring conducted on <br /> January 11, 1993, at the subject site The monitoring was performed by Blaine Tech <br /> Services, Inc , of San Jose, California <br /> Aegis intends to perform second quarter monitoring and sampling at the site in April 1993 <br /> The sampling will include purging at least three well volumes of groundwater from each <br /> of the wells Temperature, conductivity, pH, and turbidity will be measured and/or <br /> observed for groundwater stability parameters prior to sampling <br /> Aegis personnel installed a liquid hydrocarbon skimmer in well MW-3 on <br /> December 4, 1992 The skimmer has been monitored on a twice-monthly basis <br /> Aegis plans to perform an off-sate subsurface investigation, including the installation of <br /> additional monitoring well(s), provided the necessary right-of-entry agreements and/or <br /> encroachment permits can be obtained It is not known when these may be secured <br /> Aegis performed a well search within a 1/2-mile-radius of the site Well locations and <br /> addresses are included in Attachment 3 <br /> 90-02DE OMR <br /> GEOLOGISTS • ENGINEERS - GROUNDWATER SCIENTISTS <br />