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Campbell Taggart Inc. December 14, 1990 202/029000-390 Page 2 3.0 PROJECT OBJECTIVE The objective of this project is to; 1) identify the nature and extent of surface contamination observed at the site, and 2) excavate all impacted soils and remediate to clean-up levels acceptable to governing regulatory, and return the site to its original condition. This work plan does not include the excavation or remediation of any additional soil or groundwater contamination that may be discovered beyond the Rainbo drainage ditch. 4.0 REMEDIAL ALTERNATIVES EVALUATION Groundwater Technology has extensive experience in the remediation of hydrocarbon-impacted soils, using various technologies. In order to select the optimal remedial approach for the Rainbo site, the following remediation technologies were reviewed and evaluated: Haul-and-Dispose Thermal Treatment Bioremediation Relative costs for each technology were compared along with the time required for remediation, ease of installation and maintenance, required permitting, and generation of additional wastes. 4.1 HAUL-AND-DISPOSE The simplest option would be to transport the contaminated soil directly to an authorized disposal facility. The advantage of this alternative is that the contaminated soil would be removed from the site in a short period of time. The major disadvantage is the cost. Because there are few commercial Class II landfills available in California, the soil would be transported and disposed of at a hazardous waste facility, at a cost of over $250.00 per cubic yard. Other disadvantages include the long-term liabilities and taxes associated with hazardous waste disposal, and the fact that the waste was simply transferred to another location rather than eliminated. 4.2 THERMAL TREATMENT Thermal treatment involves exposing contaminated soils to elevated temperatures to destroy or volatilize the contaminants. Various types of thermal treatment units are available which can process soils. The most common type of high-temperature Incinerators are rotating kilns and fluidized beds. �Wi GROUNDWATER �' TECHNOLOGY,INC.