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kq KLEINFELDER 1 EXECUTIVE SUMMARY Forward Landfill replaced the old Interim Waste Management Unit (WMU) F with a new WMU F Class II surface impoundment. Interim WMU F was closed in accordance with the specification outline in the Closure Plan and Construction Quality Assurance Manual. As a part of the closure specifications, all residual wastes, including liquids, sludges, precipitates, settled solids, and liner materials and adjacent geologic materials contaminated by the wastes are required to be removed and discharges to an approved on-site WMU. Forward is required to provide evidence that the surrounding soil is not suspected to have been impacted by the discharge made to the existing Interim WMU F. The closure plan and manual listed the following constituents as the focus of closure assessment (absence of these constituents in soils underlying the WMU constitutes clean closure): • EPA Method 8260 (Volatile Organic Compounds VOCs) • EPA Method 8270 (Semi-volatile Organics) • EPA Method 8141 (Organophosphorous Compounds) • EPA Method 8150 (Chlorinated Herbicides) At the time of closure, no leachate was present in the Interim WMU F, so no leachate was moved to the new WMU F Class II surface impoundment. To obtain closure, the following steps were taken to comply with the specifications in the Construction Quality Assurance Manual and the Closure Plan for Interim WMU F: • Initial soil sampling: Depth assessment of possible contamination Samples were taken on October 22, 1999 from Interim WMU F before excavation commenced with a hand auger and drive sampler at depths of 2' and 3'. Analysis of samples collected at depths of 2' on October 22, 1999 revealed no contamination; therefore the samples taken at 3' were not analyzed. • Excavation observation of Interim WMU F During a site visit on November 29, 1999, Kleinfelder observed initial demolition of Interim WMU F. Forward had begun to remove about a third of the surrounding berms and soil in the impoundment to a depth of 3' below the surface. Once excavation was complete, Forward disposed of the soil and liner materials in WMU D-99. 23-483849-1303/231 OR071 Page 1 of 7 April 11,2000 Copyright 2000 Kleinfelder.Inc.