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2. Project Objective <br />2.1. Data Collection <br />Conventional drilling and trench excavating will be used to conduct the site investigation which <br />will evaluate: 1) landfill cover thickness, if any, and characteristics, 2) to the extent possible, the <br />horizontal and vertical extents of the buried wastes, 3) physical characterization of the buried <br />wastes, 4) chemical characteristics of the buried wastes for comparison to applicable regulatory <br />levels, and 5) landfill gas screening, and if conditions warrant, sampling and analysis to evaluate <br />if gas migration is a potential issue. <br />The sampling and analysis program is discussed in Section 4.7 of this work plan and is based <br />on information regarding the history of the site, expected contaminants, and applicable <br />regulatory guidelines and/or requirements. The CIWMB will use applicable regulatory levels <br />established by the USEPA and other regulatory levels, as warranted, to evaluate and <br />characterize the buried wastes. Future remedial alternatives may include clean -closure or waste <br />reconfiguration, therefore it will be necessary to evaluate if the buried wastes or portions of the <br />wastes are classified as non hazardous, California hazardous, or RCRA wastes for handling <br />and disposition. <br />2.2. Project Tasks <br />Project tasks associated with the field exploration program are described in Section 3 of this <br />work plan. <br />2.3. Expected Data <br />Based on information currently known about the site, the following is expected: <br />The 60 -acre former SSDS reportedly included disposal of wastes into previously existing <br />gravel pits associated with former gravel mining operations. It is not known if these wastes <br />were burned. Wastes may also have been buried/disposed of in other lower lying adjacent <br />areas. Also, it appears that a portion of the McNalley property, what is identified as a gravel <br />pit on the USGS topographic map, based on an earlier aerial photograph appears to have <br />also been the site of dredge tailings. <br />Subsequent to closure of the SSDS, the Bill Lane and Lynch properties appear to have been <br />the sites of waste disposal/illegal dumping. There is some information obtained from site <br />inspection reports indicating the types and general locations of buried wastes, however, the <br />exact locations are not known. It appears that some of the wastes were buried in close <br />proximity and parallel to the BNSF railroad tracks and in the vicinity of the boundaries of the <br />two properties (Figure 5). Trench excavations along the eastern and southern boundaries of <br />the Lynch IDS were observed to contain wastes at some locations (Figure 4). Based on <br />information obtained from site inspection reports, some of these wastes were burned or <br />partially burned. Locations of the buried wastes, subsequent to the closure of the SSDS are <br />not entirely known. <br />The type and thickness of landfill cover, if any, is not known. Some areas appear to have <br />cover (developed parcels) and are graded and others have nominal cover (< 1 foot) and are <br />2-17 <br />