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CHAPTER 16.0 <br /> HAZARDOUS MATERIALS <br /> A. ENVIRONMENTAL SETTING <br /> I An area designated for Household Hazardous Waste (H1-IW) will receive used batteries, <br /> latex paint, waste oil and antifreeze. It is planned to handle these materials as is <br /> currently done at the North County Recycling Center and Sanitary Landfill. These <br /> materials will be sorted from the waste stream and placed on double containment <br /> pallets for temporary storage until the latex paint, motor oil and antifreeze can be <br /> bulked at the site by County staff. The hazardous waste will ultimately be disposed of <br /> at a licensed facility or transported to appropriate recycling facilities. <br /> During construction of the proposed facility it is anticipated that material from a prior <br /> landfill operation will be excavated and transported for off-site disposal. The <br /> exploratory program performed by Kleinfelder found old landfill material at the <br /> northerly border of site in the eastern portion. The material underlies planned <br /> roadways and the commercial scale. <br /> B. ENVIRONMENTAL IMPACTS <br /> The full extent of the landfill was not defined but it is known to exist for a length of at <br /> least 200-ft along the border and to a maximum depth of approximately 9-feet. It is <br /> proposed to excavate and dispose of the old landfiIl material off-site. However, it is <br /> ' anticipated that the landfill material will be resent at the northern site boundary.Therefore, it will be necessary to lay the landfill material back to accomplish a 9-foot <br /> excavation at the site boundary. This sloped layback will extend to within 5-feet of the <br /> property line. Once the old landfill material is removed, the excavation will be <br /> backfilled with on-site soils. <br /> ISSUE: Retention Pond Water Quality <br /> The retention pond will collect stormwater runoff from the site. Since the transfer and <br /> sorting facility are under a roof, the runoff from the facility should not contain leachate <br /> from the waste disposal operation. <br /> Significance: Potentially Significant. <br /> Mitigation: <br /> 16-1. Sample and test the retentionpond water annually if <br /> required by the Central Valley Regional Water Quality <br /> Control Board. <br /> Significance After Mitigation: Not Significant. <br /> ISSUE: Exposure of Old Landfill During Construction <br /> 16-1 <br />