SITE INFORMATION AND CORRESPONDENCE

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Kearney-KPF 2 13 September 1990 Modified Closure Plan Page 10. The Letter of Closure Certification and Closure Certification Report are tentatively scheduled for submittal on 20 November 1990. Once these documents are reviewed and accepted, the site will no longer be regulated by the Toxic Pits Cleanup Act (TPCA) because Kearney- KPF will have closed the surface impoundments and has previously completed their Hydrogeologic Assessment Report (HAR) . APPENDIX B REPORT OF PRELIMINARY GEOTECHNICAL INVESTIGATION DESIGN FOR SITE CLOSURE - KEARNEY-KPF BORROW / INFILTRATION BASIN SITE Page 1. The infiltration basin was sited at the southwest corner of the western field. Portions of the basin are located over the cuttings and drilling mud disposal areas. The basin site appears to have been selected because of the lower topography in this portion of the field. However, previously this portion of the western field had been selected by Hargis for disposal of wastes generated during the remedial investigation (RI) . It is anticipated that Hargis will want to dispose of additional wastes from Phase II of the RI . The Regional Board had previously discussed with Hargis that the infiltration basin was not to be located over the landfarmed wastes. Because of the conflict in the use of this portion of the western field, the landfarmed wastes must 1) be removed and disposed at a permitted facility; 2) be removed and landfarmed in another portion of the western field; or 3) be excavated and placed in the foundation layer of the cover, or lower, and not within the upper foot of the cover. Additionally, the disposal of the wastes which were to be landfarmed was based on the analytical results for the contaminants of concern; namely heavy metals and volatile organic constituents (VOCs) . The cuttings or drilling muds were not analyzed for pH, electrical conductivity (EC) or total dissolved solids (TOS) . These wastes should also be analyzed for these constituents prior to burial in the ponds or use in the pond cover, to determine if these constituents pose a threat to water quality. Page 1. Figure 1 (Demolition and Select Sand Blanket Locations) depicts a soil disposal area. If this soil disposal area is intended to be representative of the drilling mud disposal area, it is drawn incorrectly. The drilling mud disposal area is clearly distinguishable in the field due to the different properties of the drilling mud compared to the native soils. Monitor well B-4 is not encompassed by the drilling mud disposal area and this area does not extend to the north of the diagonal access road. Page 1 . Five representative test pits were excavated in the western field to determine the engineering properties of the native soils. Based on