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Mr. Robert McClellon September 22, 2004 Page 4 of 11 Analysis of the five groundwater samples collected from the borings contained no TPHo, VOCs, or dissolved lead above laboratory detection limits. The analytical results suggest that although the wastes have remained buried at the site for up to fifty years native soil and groundwater beneath the site have not been demonstrably degraded. As a result, the wastes currently buried at the site should not be considered designated waste as suggested in the Regional Board's letter dated September 18, 2003. 3.1 Install New Water Supply Wells Mr. Palomino will contract with a State -licensed water well driller to install two new water supply wells. One well will be installed on Parcel APN 249-060-13 and one well will be installed on Parcel APN 249-060-14. The existing water supply well will be destroyed shortly after a new wells are installed. Prior to initiating any fieldwork, the selected drilling contractor will obtain appropriate permits for the installation of the new wells and the destruction of the existing well. All work will be conducted pursuant to San Joaquin County and State regulations. We anticipate that the new wells will be installed using mud rotary drilling techniques and the existing well will be destroyed by filling with neat cement grout after perforating the well casing using Cyclonite jet charges (or equivalent). 3.2 Excavate Surface and Buried Debris for Off -Site Disposal Mr. Palomino will supervise the excavation and disposal of surface and buried wastes located throughout most of the site. The excavation and removal of debris will be conducted concurrently with the general grading of the site that will be conducted to provide adequate drainage and erosion control. Parcel 13 Debris previously identified in excavaton trenches TIO, T12, T14, T15, T16, T 16A, T24, T25, T26, T63, and T64 will be removed to a permitted landfill. These areas are identified in the figure prepared by Ninyo & Moore for the CIWMB (Appendix Q. The estimated soil and debris volumes are summarized in Table 3. As indicated in Table 3, it is estimated that up to 19,000 cubic yards of material, including up to approximately 5,200 cubic yards of debris will be excavated. These are gross estimates based upon the Ninyo & Moore figure (Appendix Q. The actual volume of removed debris will be recorded and reported after completion of earthmoving activities. The mixed soil and debris in these areas will be excavated using a Case 590E backhoe. General site grading will be accomplished using an International E295 scraper, a Caterpiller 977C bulldozer, and a Caterpiller 613 scraper. All equipment will be operated by trained heavy equipment operators. No excavations are expected to exceed four feet in depth based upon site G:\GROUNDZE\Palomino\wp_sitemitfinal.doc