SITE INFORMATION AND CORRESPONDENCE_1985-1997

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KEI-P88-077 July 26, 1988 Page 3 * Estimated volume of soil contaminated with volatile hydrocarbons are as follows: Concentrations Volume of Cubic Yards >1000 ppm TPH 157 700-1000 ppm TPH 152 10-700 ppm TPH 880 Total = 1, 189 yards TECHNICAL APPROACH In an effort to expedite the remedial action work and to minimize costs, Kaprealian Engineering, Inc. (KEI) proposes to simultaneously conduct further potential contamination delineation with the proposed excavation work. KEI proposes the following scope of work: I. Remedial action plan for contaminated soil. II. Remedial action plan for groundwater. III. Mitigation measures. I. SOIL REMEDIATION The following paragraphs describe procedures for stockpiling contaminated and non-contaminated soils as they are excavated: HEALTH AND SAFETY: A primary concern during construction will be to provide for the health and safety of workers in this area. The contractor performing the work will be required to have a health and safety plan that conforms with Cal-OSHA requirements and emergency procedures ready, if needed, to protect his staff. We anticipate that this plan, at a minimum, will include provision for respirators, air venting of the trench, skin protection for the workers, and monitoring flammable and toxic vapors. The county environmental Health Department will be notified before excavation is commenced so that they may be present during the initial and/or critical areas to check for proper safety procedures. SOIL EXCAVATION AND STOCKPILE: The soil excavated from the area of concern will be stockpiled on site so that they can be aerated. Approximately 6000 cubic yards will be excavated. In stockpiling the soil, provisions will be made to contain water runoff with earthen berms. During excavation, soil samples will be collected from sidewalls of the excavated pit to determine the lateral extent of the excavation.