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1.0 INTRODUCTION The Corral Hollow SanitaryLandfill is located adjacent to Corral J Hollow Creek and Interstate 580 approximate 5 miles South of the city of Tracy in San Joaquin County. The 43-acre Class III landfill re- ceives approximately 1,000 cubic yards of solid waste materials per day. The landfill is jointly owned by San Joaquin County and the city of Tracy. The county is responsible for engineering and design of the landfill . The city is responsible for on-site operations. The Calderon amendments to the Health and Safety Code (HSC Sec- tion 41805.5) require that landfill owners analyze landfill gas and ambient air and report the results to their local air pollution con- trol district (APCD) . In a December 18, 1986 publication, Je Guidelines for Active Solid Waste Disposal Sites (Guidelines) , the California Air Resources Board (ARB) established guidelines for such testing programs. According to the Guidelines, the testing programs, called air quality solid waste assessment tests (ASWATs) , must provide enough information to allow the APCD to • Characterize the gas stream within the landfill • Determine whether specified air contaminants are present in ambient air at the site boundaries • Determine whether subsurface landfill gas is migrating off site After evaluating ASWAT results from a site, the APCD determines whether that site poses a public health risk and if additional moni- toring or remedial actions are required. To fulfill the ASWAT requirements for the Corral Hollow Sanitary Landfill , EMCON Associates developed an ASWAT proposal (see Appen- dix A) . The proposal , including the workplan which identified sample locations, sampling procedures, and analytical test methods, was submitted to the San Joaquin County Air Pollution Control District PJ9 9390304.00D 1-1 Rev. 0 09/20/88