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i CONTRACT ADDENDUM (NO.2) A total of thirteen representatives from nine environmental service and demolition contractors were in attendance at the second Lika Walk-Through. (see attached list for attendees. ) A number of issues were raised by some of those in attendance. Those issues and Woodward-Clyde responses are as follows: Issue No. l. There has been reluctance on the part of Class I1 and Class III landfill operators to quote a disposal cost for the treated waste bused upon information provided in the Bid package. WCC RESPONSE: Staff members of both the DHS and RWQCB have reviewed the contaminated sail and the WET analysis data for this project. The DHS has assured Woodward-Clyde that they will issue a letter declaring the treated soil as nonhazardous provided the soluble and total levels for copper and lead do not exceed STLC and TTLC values respectively. Based upon the treatability studies (see Contract Documents, Appendix C, Tables C.8 and C.9) it was concluded that .affective chemical fixation of metals in the soil for disposal as a nonhazardous waste was feasible. This conclusion was reached even though several vendors submitted treated samples which either did not meet the STLC criterion for copper or exceeded the maximum allowable pH. Consideration was given to the fact that the soil samples collected (see Contract Document, Appendix C, Table C. 6) for the treatability studies had copper concentrations considerably higher than average levels for soils at the site determined during the remedial investigation. Metal concentrations in the treated soil are expected to be comparable to those shown in Table 2-1. These data, together with the requirement that the soil will pass the California WET analysis and have a pH less than 12 . 5, may be sufficient for landfill disposal pricing. At this time, the RWQCB cannot issue approval for disposal of the soils without the submission of a proposal . The proposal requires that the landfill in which the treated soil is to be placed be identified and that all available waste quantity and chemical analysis data be provided. Woodward-Clyde Consultants will prepare the proposal and will present it to the appropriate RWQCB engineer in charge of the targeted landfill . Approval by RWQCB is, in part, based upon an assessment of waste compatibility with information contained in the i SWAT report for the targeted landfill . It is Woodward-Clyde's understanding that the treated soil will be declared a non- designated waste and suitable for disposal at a Class XII landfill, a if the depth to groundwater at the landfill exceeds 100 feet and its placement is such that there is no possibility for surface runoff. r J 1