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CAMBRIA ` <br /> July 11, 1997 <br /> Mr. Ron Rowe <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, 3`d Floor <br /> Stockton, CA 95201-0388 <br /> Re: Investigation Work Plan <br /> Shell Service Station 6) <br /> 341 Main Street <br /> Ripon,California <br /> WIC#204-6562-0804 d�l'C10ru� <br /> Dear Mr. Rowe: n'1 <br /> As you requested in your June 6, 1997 letter, Cambria Environmental Technology, Inc. (Cambria)is <br /> submitting this work plan for a subsurface investigation at the site referenced above on behalf of Shell <br /> Oil Products Company. Our objective is to define the extent of hydrocarbons in soil beneath the site. <br /> A brief site summary and our proposed scope of work for this investigation are described below. <br /> SITE SUMMARY ! <br /> I <br /> I <br /> I <br /> Cambria collected tank and product line removal samples in April 1996. No total petroleum <br /> hydrocarbons as gasoline(TPHg) or benzene were detected in soil samples from beneath the USTs or <br /> in all but one pipeline samples(see Figure 1). The area southeast of the southeast dispenser island was <br /> the only place where TPHg and benzene were detected. The area was subsequently over-excavated to <br /> a depth of 18 feet, which was the maximum depth possible with the equipment available: The <br /> CAMBRIA excavation, sampling, and analytical results were summarized in Cambria's July 25, 1996 Tank <br /> I <br /> ENVIRONMENTAL Removal and Soil Sampling Report. <br /> ! <br /> TECHNOLOGY,INC. <br /> 114465TH STREET, PROPOSED SCOPE.OF WORK <br /> SuiTE B Based on the data from the tank and product line removal, one ground water monitoring well located <br /> OAKLAND, in the immediate vicinity of the dispenser where TPHg was detected will be sufficient to define the <br /> vertical extent of hydrocarbons in soil and determine whether hydrocarbons have impacted ground <br /> CA 94608 <br /> water. If elevated hydrocarbon concentrations are detected in ground water after two quarters of <br /> I"420-0700 <br /> FAY:(510)420-9170 <br />