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McClelland engineers,inc. i� F E a 2 " 1969 2160 Eastman Avenue,Ventura,California 9$003, Era 1 1 Tel.(805) 844-b535, Telexl 659241 March 4, 1988 Project No. 0588-1603 Ogden Environmental Services, Inc. ).0955 John Jay Hopkins Drive San Diego, California 92121 Attention! William S. Rickman Site Assessment Plan Ogden Foods Underground 'Tank 1405 South Fresno Avenue Stockton, California Introduction In response to your request of March 1, 1988, we have prepared this site assessment plan to evaluate the nature and extent of contamination that has resulted from leaks in the underground fuel oil tank at the above referenced location. A preliminary assessment of subsurface soil and groundwater contamination was provided by Kleinfelder and Associates in a report dated April 8, 1987. This report indicated that the soils in the vicinity of the tinderground fuel oil tank were contaminated with petroleum hydrocarbons. No evidence of groundwater contamination was detected from monitoring wells completed in the tank area. Total petroleum hydrocarbon (TPli) concentrations in the soil samples ranged from 20 to 23,000 ppm. Review of the data suggests that the soil is contaminated beginning at fairly Shallow depths (5 feet) in the vicinity of the tank and extends down to below the lowest interval tested (15 to 20 feet) . The greater the distance from the tank, the greater the depth at which contamination is first noted. The horizontal and vertical extent of contamination hes not been realized in the preliminary assessment. McClelland Engineers, Inc. proposes to utilize the existing data base and provide additional investigation to more accurately delineate the verti- cAl and horizontal limits of the soil contamination. We understand that Ogden Environmental Services is performing a feasi- bility study relative to treating the excavated hydrocarbon contaminated soil (using a portable hazardous waste incinerator) . As part of this feasibility study, both the soli chemistry properties and the geotechnical properties of. the site soils will need to be investigated. McClelland proposes to conduct a multifaceted assessment program to identify the limits of contamination and provide preliminary information re)ative to excavatability of soils (i.e. , dewatering and shoring applications) and foundation design considerations