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We discuss each criterion in more detail below: <br /> Class II Levels for Metals <br /> Material that could potentially contain levels of metals above background is evaluated by <br /> a two-tier system. Initially total metal concentrations are evaluated for concentrations <br /> that exceed ten times the Soluble Threshold Limit Concentrations (STLC) limits <br /> specified in state regulations. In the event a particular metal exceeds this concentration, <br /> an STLC test is performed on the samples to determine whether soluble concentrations <br /> exceed state hazardous waste thresholds. Material exceeding hazardous thresholds is not <br /> accepted at the facility. <br /> The soluble test data is then evaluated to determine whether concentrations of the various <br /> metals exceed "designated levels" criteria established by the Regional Water Quality <br /> Control Board for the facility. These are (in mg/1): <br /> ■ Cadmium 0.05 <br /> ■ Chromium (VI) 0.5 <br /> ■ Copper 20 <br /> ■ Lead 1.5 <br /> ■ Mercury 0.02 <br /> ■ Nickel 1.0 <br /> ■ Zinc 200 <br /> These soluble levels are determined by a Waste Extraction Test or WET test. Soils with <br /> soluble metal levels above these thresholds and below the hazardous waste levels are <br /> identified and reported as Class II Soil at Forward Landfill. They are considered disposal <br /> in terms of the tonnage cap. Soils with soluble metal concentrations below these <br /> thresholds are used in the manner described in the first paragraph of this transmittal. <br /> There are no Class II levels established for other metals. That is, soils or other wastes <br /> with soluble levels of other metals up to hazardous levels would not be considered Class <br /> II wastes at Forward Landfill. These materials may be used beneficially throughout the <br /> facility as described above. <br /> BAAOMD Regulation 8,Rule 40 <br /> This regulation defines soils with organic contents greater than 50 ppm (parts per million) <br /> as "Contaminated Soil." This regulation is similar to the comparable San Joaquin Valley <br /> Unified Air Pollution Control District regulation (Rule 4651), which defines <br /> "Contaminated Soil" as "soil which registers 50 ppm, or greater, of VOC when measured <br /> as hexane at a distance of 3 inches above the surface, or soil containing VOC which has <br /> been identified for decontamination by the designated lead agency." <br /> 2 <br />