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Mr. Robert McClellon September 22, 2004 Page 2 of 11 Joaquin, Final Report, summarized a site investigation conducted by the CIWMB. The objective of the CIWMB investigation was to 1) verify current ownership of all parcels previously operated as the Snyder Landfill, 2) to determine the horizontal and vertical extent of the waste, 3) to characterize the waste via sampling and laboratory analyses, and 4) to determine the condition of the site with regard to applicable California Code of Regulation, Title 27 for site security, cover, and drainage and erosion control. The investigation consisted of excavating numerous trenches on several adjoining parcels of land, characterizing the soil and debris encountered in the excavations, monitoring the air for potential contaminants, and collecting and analyzing numerous soil samples. No hazardous levels of metals, volatile organic constituents (VOCs), semivolatile organice constituents (SVOCs), heavy metals, or any other tested constituent of concern were detected in samples collected from the subject parcels. Based upon its investigation, the CIWMB concluded that the subject parcels maintained inadequate cover and drainage and erosion control and failed to meet site security standards outlined in Title 27. The CIWMB recommended that 1) above -ground surface wastes be disposed of at a permitted landfill, 2) buried wastes be consolidated, covered, and graded to meet State Minimum Standards of Cover, 3) the site be properly secured by fence and gate to prevent access by unauthorized vehicles and persons, and 4) additional testing be conducted as necessary during remediation and appropriate action taken based upon laboratory results. In a letter dated September 18, 2003, the California Regional Water Quality Control Board, Central Valley Region (RWQCB) noted that the results of the investigation demonstrated that the wastes at the site do not have hazardous waste characteristics. RWQCB staff noted, however, that soluble lead concentrations in certain samples collected from Parcel 13 exceed the California Public Health Goal in Drinking water of 2 ug/1, and such soil should be considered designated waste. Tentative plans for Site mitigation include excavating debris from certain areas of each parcel for off-site disposal, consolidating the remaining debris at selected portions of each parcel, constructing an engineered cap over the consolidated debris, and providing adequate drainage/erosion control and site security. 2.1 Field Activities On July 28, 2004, an experienced Ground Zero geologist supervised the advancement of five soil borings at the subject site. The borings were advanced by Fisch Environmental (C57-683865) using a Geoprobe 6600 direct -push drilling rig. The borings were 1 t/4 inches in diameter and were advanced to depths ranging from 26.5 to 40 feet below the ground surface (bgs) for the purpose of collecting soil and groundwater samples below the previously identified landfill material. The depth to groundwater in the borings varied from approximately 25 feet bgs in boring SB3 (the water level rose to approximately 18 feet bgs in the temporary well casing) to approximately 40 feet bgs in boring SB2 The drilling locations are shown in Figure 3. G:\GROUNDZE\Palomino\wp_$itemitti nal.doc