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• i <br /> AEGIS ENVIRONMENTAL INC .> <br /> 1050 Melody Lane, Suite 160, Roseville, CA 95678 ♦ 916. 782-2110/916.969-2110/FAX 916.786-7830 <br /> October 23, 1992 ¢�?� <br /> C" <br /> ti D <br /> o C T 2 9 1992 <br /> Mr Dan Kirk <br /> Shell Oil Company ENVIRONMENTAL HEALTH Post Office Box 5278 PERMIT/SERVICES <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, IncAe is t r <br /> ( 9 )= is pleased o provide Shell Oil Company (Shell) the <br /> attached information documenting the results of quarterly groundwater monitoring <br /> conducted on July 13, 1992, at the subject site The monitoring was performed by <br /> Emcon Associates, of Sacramento, California <br /> The current station building was erected, and underground fuel storage tanks (UST) were <br /> originally installed at the site in 1964 Four steel UST were installed in the former tank <br /> location shown on Figure 2 The original steel UST were excavated and removed in <br /> May 1990, and were replaced with three double-walled fiberglass UST in <br /> g S stalled in the new <br /> tank basin (Figure 2) Since installation of the original UST, the site has been operated <br /> solely as a Shell gasoline service station <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 this report represent <br /> our professional opinions These opinions are based on currently available information, <br /> and were developed in accordance with accepted geologic, hydrogeologlc, and <br />. engineering practices for this time and for this specific site Other than this, no warranty <br /> is implied or intended <br /> 89-016C QMR <br /> GEOLOGISTS • ENGINEERS GROUNDWATER SCIENTISTS <br />