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-- CAMBRIA <br /> July 11, 1997 <br /> Mr. Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Ave., 3rd Floor <br /> Stockton, California 95201-0388 <br /> Re: Investigation Work Plan At <br /> Shell Service Station ICj <br /> WIC#204-4728-0502 w <br /> 1071 North Main Street <br /> Manteca, California <br /> Dear Mr. Rowe: <br /> As you requested in your June 16, 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 and assess whether <br /> hydrocarbons are in ground water beneath the site. A site summary and our proposed scope of work <br /> for this investigation are described below. <br /> SITE SUMMARY <br /> Cambria collected tank and product line removal samples in August 1996. The highest concentration <br /> of hydrocarbons from the USTs was from the east end of tank 4 (1,300 ppm TPHg. This area was <br /> subsequently over-excavated to a depth of 25 feet; which was the maximum depth possible with the <br /> available equipment. Soil samples from the bottom of the over-excavation contained only 3.4 ppm <br /> TPHg. The only TPHg detected from the dispensers was from the western dispenser of the eastern <br /> canopy, at a concentration of 1,200 ppm TPHg. The only TPHg detected from the product lines was <br /> CAMBRIA located where the product lines entered the tank complex, at a concentration of 3.1'ppm TPHg. Based <br /> on these results, the only area that warrants additional investigation is the western dispenser. <br /> ENVIRONMENTAL <br /> TECHNOLOGY,INC. PROPOSED SCOPE OF WORK <br /> 1144 65TH STREET, <br /> The only area where elevated hydrocarbon concentrations remain in soil is the western dispenser. One <br /> SUITE B ground water monitoring well at this location should be sufficient to define the extent of hydrocarbons <br /> OAKLAND, in soil and determine whether hydrocarbons have impacted ground water. The proposed well location <br /> is near the dispenser where TPHg was detected. <br /> CA 94608 <br /> Pit:(510)420-0700 <br /> FAx:(510)420.9170 <br />