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Campbell Taggart Inc. December 14, 1990 202/029000-390 Page 7 7.3 SOIL SAMPLING Subsequent to the construction of the soil treatment cells, several composite samples will be collected so that the initial contaminant concentrations (soil characterization) can be determined. The samples collected will initially be analyzed for gasoline, diesel, and motor-oil constituents, chlorinated hydrocarbons and metals to adequately characterize contaminant concentrations in the soil. One soil sample per 100 yard' may be sufficient for this purpose, however, the exact sampling frequency will be determined by SJCEHD requirements. The soil samples will be collected with a hand-held drive sampler from greater than 3 feet below the surface of the treatment cell. Samples will be collected in brass tubes, the ends of which will be sealed with foil and plastic caps. The samples will be stored on ice and then transported with a Chain-of-Custody Manifest to a State-certified laboratory. At the same time that the Initial soil samples are collected, samples will also be collected for quantification and optimization of hydrocarbon-utilizing bacteria levels. Optional pH and soil moisture levels will also be determined for operational process control. These samples will be collected in sterilized sample tubes in the same manner as the previous samples. The samples will be analyzed by a State-certified bioremediation laboratory. The site will be visited by Groundwater Technology personnel every week during the course of the project,to ensure that the blowers are functioning properly and that the polyethylene covers remain in place. The moisture of the treatment cells will be monitored periodically,and nutrients will be reapplied if required. One sample per 200 yard'will be collected halfway through the project from the original locations and analyzed for motor-oil, pH, soil moisture, and hydrocarbon-utilizing bacterial levels in order to monitor the progress of remediation. Samples will be collected again at the end of the project to verify remediation results. For closure purposes, one sample per 50 yard' of soil will be collected and analyzed in the final sampling round. Samples will be collected and analyzed as previously described. Upon approval of the closure request by the governing regulatory agencies, and removal or replacement of the soil by the client, the site will be returned to its original condition. 8.0 TIME LINE A proposed time line for the project is presented in Appendix B. Groundwater Technology estimates it will take approximately 75 to 120 days to complete this project. The time line is based upon a 120 day treatment period. This estimate is derived from current site knowledge and optimum treatment conditions, along with Groundwater Technology's previous experience with motor-oil contaminants, and estimates of concentrations in the soil. The length of time required for this project will vary according to regulatory J GROUNDWATER TECHNOLOGY,INC.