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• Mr. Robert McClellon July 1, 2004 Page 2 of 5 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/l, and such soil should be considered designated waste. Tentative plans for site remediation of the parcels 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. A workplan for overall site remediation will be submitted under separate cover. PROPOSED SCOPE OF WORK Ground Zero will supervise the drilling and sampling of five borings at the site. The boring locations are designed to investigate soil and groundwater near the identified waste areas and at the southern border(hydraulically downgradient) of each parcel. Boring Locations Three borings would be drilled on Parcel 13 and two borings would be drilled on Parcel 14. The locations of proposed borings are presented on Figure 4. On Parcel 13, one boring will be drilled immediately south of the area designated for consolidation and capping in the northern corner of the site, one boring will be drilled downgradient of the sample with the greatest detection of soluble lead (2.5 ppm at T-16-4), and one boring will be drilled near the southern boundary of the property. On Parcel 14, one boring will be placed in the northeastern portion of the parcel adjacent to the area designated for consolidation and capping, and one boring G:\GROUNDZE\Palomino\wp_borings.doc