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2. Project Objective <br /> 2.1 . Data Collection <br /> Either direct push equipment or a tracked excavator will be used to conduct the site <br /> investigation to determine: 1)the thickness of the cover, 2)the horizontal and vertical extents of <br /> the disposal site, 3) chemical and physical characterization of the fill material for comparison to <br /> regulatory thresholds and 4) landfill gas screening and sampling and analysis to determine if <br /> gas migration is an issue. Sampling will be conducted under the California Code of <br /> Regulations, Title 22, section 66261.10 et seq. for characterizing hazardous waste. The <br /> CIWMB will use regulatory limits established from the California Department of Toxic and <br /> Substance Control and federal levels for evaluating the soil/ash. Detailed analytical procedures <br /> are specified in section 3.9 of this plan. Since a portion of the burn-ash may need to be <br /> disposed of to a municipal solid waste landfill under clean-closure or waste reconfiguration <br /> remedial alternatives, it will be necessary to determine if the soil-ash is considered hazardous <br /> for the purpose of handling and disposition. The data from these procedures will be used to <br /> identify lead concentrations in surface soils and subsurface burn-ash. <br /> 2.2. Project Tasks <br /> During the investigation of the Santa Fe Road site a sampling location reference grid will be <br /> established and tied to an established benchmark at the site. Relocation of planned sampling <br /> locations may be performed and the location referenced to the reference grid. Sampling at a <br /> location will entail using either direct-push equipment, e.g. Geoprobe, which will drive a <br /> sampling tool down to native soil beneath the old fill, or a tracked excavator to perform trenching <br /> through the cover and waste down to native soil (expected to be the former gravel pit bottom). <br /> Under the authoritative sampling protocol, the CIWMB field engineer may change individual <br /> sampling locations based on site-specific field conditions (including unforeseen obstructions, <br /> visible signs of contaminated soils or other factors). CIWMB anticipates that approximately 25 <br /> sampling locations will be required to adequately define the horizontal and vertical extents of the <br /> fill and cover thickness (reference figure 6). Soil samples will be screened using a GMI 422 Gas <br /> Surveyor instrument and also screened for radioactivity using portable radiation detection <br /> equipment and then sent to a State of California certified hazardous waste laboratory for <br /> analysis. The trench or hole created by either the direct push sampling equipment or tracked <br /> excavator will be screened using a GMI 422 Gas Surveyor instrument capable of measuring <br /> concentrations of methane, hydrogen sulfide, carbon dioxide, oxygen and carbon monoxide. <br /> The sampling holes will be filled with native soil and bentonite. Sampling activities are <br /> scheduled to occur in <br /> 2.3. Expected Data <br /> Chemical constituent concentration data obtained during this investigation will be evaluated to <br /> determine if additional sampling is necessary. Additional sampling may be performed if it is <br /> CIWMB 13 <br />