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CANIBRIA <br /> October 15, 1997 <br />=� Mr. Ron Rowe <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95201-0388 <br /> Re: Investigation Work Plan Addendum PAYMENT <br /> Shell Service Station � ' n,�er ? <br /> 341 Main Street OCT2 <br /> Ripon, California O 1997 <br /> WIC#204-6562-0804 <br /> SAN JOAQUIN COUNTY <br /> Cambria Project#240-0342 PUBUC HEALTH SERvICEs <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Dear Mr. Rowe: <br /> As-requested in your September 25, 1.997 facsimile, Cambria Environmental Technology, Inc. <br /> (Cambria)is submitting this work plan addendum for a subsurface investigation at the site referenced <br /> above on behalf of Shell Oil Products Company. Our objective is to define the extent of hydrocarbons <br /> in soil and ground water beneath the site. The site background and standard well installation and soil <br /> sampling protocols were included Cambria's work plan submitted July 11, 1997. Our revised proposed <br /> scope of work for this investigation is described below. <br /> PROPOSED SCOPE OF WORK <br /> Based on the data from the tank and product line removal,at least one ground water monitoring well <br /> located in the immediate vicinity of the dispenser where TPHg was detected will be installed to define <br /> CAMBRIA the vertical extent of hydrocarbons in soil and determine whether hydrocarbons have impacted ground <br /> ENVIRONMENTAL Fater. If hydrocarbons are detected in soil or ground water during the installation of the first boring, <br /> two additional wells will be installed during the same mobilization. The San Joaquin County <br /> TECHNOLOGY,INC. Department of Public Health Services (SJCPHS)will be notified at least 48 hours prior to field work. <br /> 1144 65TH STREET, All work will be allowed to be witnessed by SJCPHS staff. <br /> SUITE B The specific tasks to be performed include: <br /> OAKLAND, <br /> Utility Location: Cambria will notify Underground Service Alert of our drilling activities to identify <br /> CA 94608 utilities in the site vicinity. <br /> PH:(510)420-0700 <br /> FAx:(510)420-9170 <br /> _1 <br />