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McClelland engineers,inc. <br /> 2140 Eastman Avenue,Ventura,California 93003, <br /> Tel. (805) 644-5535,Telex:659241 <br /> March 4, 1988 <br /> Project No. 0588-1603 <br /> Ogden Environmental Services, Inc. <br /> 10955 John Jay Hopkins Drive <br /> San Diego, California 92121 <br /> Attention: William S. Rickman <br /> Site Assessment Plan <br /> Ogden Foods Underqround Tank <br /> 1405 South Fresno Avenue <br /> Stockton, California <br /> Introduction <br /> In response to your request of March 1, 1988, we have prepared this site <br /> assessment plan to evaluate the nature and extent of contamination that has <br /> resulted from leaks in the underground fuel oil tank at the above referenced <br /> location. A preliminary assessment of subsurface soil and groundwater <br /> contamination was provided by Kleinfelder and Associates in a report dated <br /> April 8, 1987. This report indicated that the soils in the vicinity of the <br /> underground fuel oil tank were contaminated with petroleum hydrocarbons. No <br /> evidence of groundwater contamination was detected from monitoring wells <br /> completed in the tank area. Total petroleum hydrocarbon (TPH) concentrations <br /> in the soil samples ranged from 20 to 23,000 ppm. Review of the data <br /> suggests that the soil is contaminated beginning at fairly shallow depths (5 <br /> feet) in the vicinity of the tank and extends down to below the lowest <br /> interval tested (15 to 20 feet) . The greater the distance from the tank, the <br /> greater the depth at which contamination is first noted. The horizontal and <br /> vertical extent of contamination has not been realized in the preliminary <br /> assessment. <br /> McClelland Engineers, Inc. proposes to utilize the existing data base <br /> and provide additional investiaation to more accurately delineate the verti- <br /> cal and horizontal limits of the soil contamination. <br /> We understand that Oqden Environmental Services is performing a feasi- <br /> bility study relative to treating the excavated hydrocarbon contaminated soil <br /> (using a circulating bed combustor) . As part of this feasibility <br /> study, both the soil chemistry properties and the geotechnical properties of <br /> the site soils will need to be investigated. McClelland proposes to conduct <br /> a multifaceted assessment program to identify the limits of contamination and <br /> provide preliminary information relative to excavatability of soils (i.e. , <br /> dewatering and shoring applications) and foundati.Dn design considerations <br />