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INFORMATION SHEET ORDER NO. 5-01-176 CORRAL HOLLOW SANITARY LANDFILL SAN JOAQUIN COUNTY The Corral Hollow Sanitary Landfill is a closed, Class III, municipal solid waste landfill in San Joaquin County. It is adjacent to Corral Hollow Creek and Interstate 580, approximately 5 miles south of Tracy. The site consists of 57.71 acres, of which 42.79 were permitted for landfilling. The remaining acreage is comprised of access roads, storm water detention ponds, and setbacks for environmental monitoring and fire-breaks. The site is comprised of Assessor's Parcel Numbers 253-030-05, 253-030-06, 253-030-07 and portions of 253-030-02 in Section 18, T3S, RSE, Mount Diablo Base and Meridian. The landfill is owned and operated by the County of San Joaquin. The county is installing a landfill gas collection system because high emissions of methane have been noted along the northwest perimeter of the landfill. The county has also demonstrated that the landfill gas contains volatile.organic compounds (VOCs) that may have contributed to the VOC impacts noted in shallow groundwater monitoring well MW-5. The county has proposed operation of the landfill gas collection system as a corrective action for the VOC impact. The shallow,aquifer is approximately 70 feet below grade but has only been encountered along the northeastern side of the landfill. A deeper aquifer, encountered at approximately 320 feet below grade is also present, however, three monitoring wells within this flow zone have been dry since 1991. These WDRs contain post-closure monitoring requirements including evaluation of the landfill gas collection system as a corrective action measure for the shallow groundwater, and a requirement for the county to propose additional subsurface monitoring for the southwestern half of the landfill. WWA:14June 2001