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2020 Solid Waste and Moderate <br />Risk Waste Management Plan Update <br /> <br />AX0304191054PDX 7-11 <br />7.7 Petroleum-Contaminated Soils <br />Petroleum-contaminated soils (PCS) are soils that have been contaminated by a petroleum product <br />through leaks from petroleum product storage tanks or spills. Some PCS can be contaminated with lead, <br />benzene, solvents, and PCBs and therefore may be considered hazardous. This section discusses only <br />nonhazardous PCS. <br />PCS requires clean up when hydrocarbon contamination levels exceed those specified in Ecology’s <br />Model Toxics Control Act (MTCA) Cleanup Regulation (WAC 173-340). Under the MTCA, there are <br />separate cleanup levels for industrial verses nonindustrial zoned land along with maximum allowable <br />levels for each individual constituent. PCS above MTCA cleanup levels can be treated in-situ, in place, or <br />excavated and treated onsite or at an approved treatment facility. <br />7.7.1 Existing Conditions <br />PCS generated in Kittitas County may be disposed of in several ways. One option is for the generator to <br />remediate and dispose of the soil on site. Another option is to haul the PCS to the Graham Road facility in <br />Spokane, the Roosevelt Landfill in Klickitat County, or the Greater Wenatchee Regional Landfill in <br />Douglas County. The amount of PCS disposed annually varies widely, primarily dependent on the <br />number of projects that include remediation of sites such as gasoline stations. Historically the Ellensburg <br />transfer station has taken in and managed some PCS generated by the County. This practice will end <br />with the move to the new transfer station location. <br />7.7.2 Petroleum Contaminated Soil Needs and Opportunities <br />Proper disposal of PCS is largely the responsibility of the generator. Generators have several options, <br />including treating their soils onsite, disposing of them at a regional treatment center, or disposing of them <br />at a permitted landfill. The generator must select a method approved by Ecology and will use cost to <br />make the final selection of disposal method. Generators with PCS designated as dangerous wastes must <br />find other methods of appropriately disposing of their wastes that complies with all local, state, and <br />federal regulations. <br />Volumes of PCS that are generated and require disposal are highly variable and dependent on the <br />number and size of remedial activities taking place. However, most efforts to remove and upgrade aging <br />gasoline or fuel tanks have been accomplished and volumes of PCS originating from these activities are <br />expected to decrease. <br />7.7.3 Petroleum Contaminated Soil Recommended Options and Implementation Actions <br />The following options for improving petroleum contaminated waste management are recommended. Each <br />option and the associated implementation actions are discussed below. <br />7.7.3.1 In-County PCS Site <br />Support the development of a site within the County to which soil can be taken for remediation into a <br />useful product. The remediated soil can then be used as daily cover at the Ryegrass Landfill CDL facility. <br />7.7.3.2 Potentially Contaminated Street Sweepings Management <br />Evaluate management solutions for street sweeping debris to be remediated, which can be used as cover <br />at the Ryegrass CDL facility, after proper testing. <br />7.7.3.3 Feasibility Study for PCS Management <br />Study the feasibility of options to effectively handle PCS, based on available funding. i) . I ,