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� AMBRIA <br /> July 25,2006 <br /> Ms.Vicki McCartney Yom+ a e* <br /> San Joaquin County Environmental Health Department vY% <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> Re: Fate and Transport Modeling Report <br /> Shell-branded(Independent)Service Station <br /> 341 East Main Street <br /> Ripon,California <br /> SAP Code 135816 <br /> Incident No.98995874 <br /> SJCEHD Site Code 506186 <br /> Dear Ms. McCartney: <br /> Cambria Environmental Technology, Inc. (Cambria) is submitting this report on behalf of <br /> Equilon Enterprises LLC dba Shell Oil Products US (Shell) for the property located at 341 East <br /> Main Street, Ripon, California. This report was prepared pursuant to San Joaquin County <br /> Environmental Health Department's September 26, 2005 letter to Shell. This letter provided <br /> comments on the June 9, 2005 Case Closure Summary and specifically requested Shell to verify <br /> that previous methyl tertiary butyl ether (MTBE) detections in soil beneath the site are not <br /> currently acting as a secondary source to impact groundwater. To address this issue, Shell <br /> performed fate and transport modeling, and reviewed historical remediation and groundwater <br /> analytical data to determine if previous MTBE soil detections continue to pose a threat to <br /> groundwater quality. <br /> The modeling results and the data gathered during soil vapor extraction (SVE) testing, <br /> groundwater extraction (GWE) operations, and groundwater monitoring events demonstrate that <br /> the remaining MTBE mass in unsaturated soils is negligible and future MTBE impacts to <br /> groundwater are unlikely. The site background and results supporting this conclusion are <br /> discussed in detail below. <br /> SITE DESCRIPTION <br /> The subject property is located on the northwest corner of the intersection of East Main Street <br /> Cambria <br /> and rhP Riahwav 99 on/off ramp in Ripon. California (Figure 1). The site is an operating Shell- <br /> Technology,Inc. branded (independent) service station with an underground storage tank (UST) complex, two <br /> *Perkins Street dispenser islands,a car wash,and a station building(Figure 2). <br /> ..a,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />