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Greg Vaughn -2- 1 December 1989 <br /> • Analyses on the muds and cuttings must be for soluble concentrations of <br /> all the heavy metals listed in Section 66699(a) of Title 22 of the <br /> California Code of Regulations and for volatile organics. <br /> • The land disposal of muds, cuttings and waters shall not be performed <br /> during the rain event. <br /> • The land disposal of muds, cuttings and waters should be performed in <br /> increments. The disced soils/wastes should be allowed to thoroughly dry <br /> prior to application of additional wastes. <br /> • The on-site disposal of muds and cuttings should be in lifts spread as thin <br /> as possible. <br /> • The on-site disposal of development and aquifer test waters and drilling <br /> mud should be performed so as to maximize volatilization. Application of <br /> water at a rate such that rivulets could form should be avoided. <br /> • The wastes disposed to land should be thoroughly blended by discing to <br /> promote mixing and volatilization. <br /> • The on-site disposal of the muds, cuttings and waters shall be in separate <br /> areas and there should be no mixing of wastes in the designated areas. <br /> • The Regional Board must be notified at least three days prior to the <br /> commencement of land disposal . <br /> Because the disposal of wastes from the remedial investigation is limited and <br /> short-term, it is assumed that the disposal areas will be completely dried prior <br /> to the completion of the remedial investigation. Therefore, in order to <br /> thoroughly document on-site waste disposal , Hargis should take representative <br /> samples from each disposal area after drying and analyze for those known wastes <br /> constituents which were mixed with the native soils. Hargis will be required <br /> to submit a technical report summarizing the volumes and concentrations of wastes <br /> disposed of on-site from Phase II of their remedial investigation. <br /> CKW:ava <br />