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1.0 INTRODUCTION <br />A scope of work with associated cost estimate is herein provided for <br />further investigation and a subsurface fire suppression demonstration at <br />the Kailua-Kona Landfill.. This work may be incorporated into a <br />Supplemental Environmental Project (SEP) as determined by the United <br />States Environmental Protection Agency (USEPA) and the County of <br />Hawaii. <br />1.1 SITE DESCRIPTION AND HISTORY <br />The Kailua-Kona Landfill is a closed municipal waste landfill in the North <br />Kona District, about 3 miles north of Kailua-Kona on the west coast of the <br />Island of Hawaii (Figure 1). The landfill operated from about 1975 until <br />1993. The landfill is approximately 20 acres in size, located east of the <br />Queen Kaahumanu Highway (Tax Map Key 7-4-08:16, Figure 2). <br />Neighbors include the Kailua Police Station and Kealakehe Elementary <br />School (Figures 3 and 4). The closest residence is nearly 1 mile east of the <br />landfill. During operation, several landfill fires were known to exist, and <br />waste combustion is believed to have continued after landfill closure to <br />the present time. Based on discussions with the County of Hawaii and <br />USEPA and review of available historical documents, ERM has developed <br />project objectives and a scope of work to achieve stated objectives. <br />The USEPA and the County of Hawaii provided ERM with historical <br />documents regarding the landfill. A list of documents received and <br />reviewed is provided in the References section of this report. <br />Municipal solid waste was disposed of at the facility from the late 1970s <br />until 1993. Waste was placed directly on basalt bedrock without an <br />underliner system; high permeability lava tubes are thought to be present <br />beneath placed wastes. Subsurface fires within the waste material and <br />odor complaints from neighbors are documented as early as 1991. <br />Also in the early 1990s, before final landfill closure, studies were <br />performed to evaluate landfill gas and ambient air at the landfill and the <br />adjacent Police Station. Air samples were analyzed for volatile organic <br />compounds (VOCs), but none were detected above blank control <br />concentrations. At the time, landfill fires ("hotspots") were known to <br />landfill employees; the h.otspots would result in visible flames when <br />exposed. Parametrix (1992a) interpreted temperature probe <br />measurements to indicate that perimeter landfill areas with greater <br />ERM 1 KAILUA-KONA LANDFILL/ 0061204 - 3/14/2008 <br />