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MS <br /> AEGIS ENVIRONMENTAL , INC <br /> 1050 Melody Lane, Suite 160, Roseville, CA 95678 ♦ 916.782 21101916.969-2110 1 FAX 916. 786-7830 <br /> December 9, 1992 <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 204-7524-2408) <br /> 4445 Pershing 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 /> October 8, 1992, at the subject site by Emcon Associates of Sacramento, California <br /> The October 8, 1992, monitoring event represents the fourth consecutive quarter the <br /> samples collected from all four monitoring wells on site have indicated concentrations <br /> below the respective detection limits for all petroleum hydrocarbons tested <br /> First quarter monitoring and sampling will be conducted at the site in January 1993 The <br /> sampling will include purging at least three well volumes of groundwater from each of the <br /> wells Temperature, conductivity, pH, and turbidity will be measured and/or observed for <br /> groundwater stability parameters prior to sampling <br /> The interpretations and/or conclusions that may be contained within the attachments <br /> represent our professional opinions These opinions are based on currently available <br /> information and were developed in accordance with currently accepted geologic, <br /> hydrogeologic, and engineering practices at this time and for this specific site Other than <br /> this, no warranty is implied or intended <br /> �1 <br /> 89-0160 OMR <br /> GEOLOGISTS ENGINEERS • GROUNDWATER SCIENTISTS <br />