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is included as Appendix C of this Engineering Review. A Calderon Air Quality Solid Waste Assessment Test (AQSWAT) was completed for the site in September of 1988 to comply with the Calderon amendments to the Health and Safety Code, Section 41805. The testing procedures employed were approved by the San Joaquin Local Air Pollution Control District prior to implementation. The AQSWAT report was submitted to the District on October 3, 1988. A copy of the AQSWAT Report is included as Appendix D of this Engineering Review. The AQSWAT testing performed at the site included installation of gas monitoring probes around the perimeter of the site and near the on-site structures. The test results determined: 1) The effect of landfill gases on ambient air at the site boundary. 2) The composition of the gas stream within the landfill. 3) Whether gas is migrating off-site. A summary of the testing results are contained in Section 6 of the AQSWAT Report. F. Access and service roads: Information on access and service roads is contained in Item IIIA. , above. G. Liners: The Corral Hollow Sanitary Landfill does not have a liner. Refuse has been landfilled at the site by digging of trenches in native material and filling of these trenches with waste. It should be noted that Section 2533 (b) of Subchapter 15 does not require placement of a clay liner with permeability of 1 X 10"6 cm./sec. or less for Class III sites if the site characteristics ensure no impairment of beneficial uses of surface or ground water beneath or adjacent to the site. Impairment of groundwater from landfills generally occurs when leachate, formed from decomposed waste combined with moisture within the fill, migrates downward through the soils beneath to the groundwater. This may be caused by precipitation entering the fill which produces leachate under a hydraulic head in the fill resulting in downward migration of the leachate. The Corral Hollow Sanitary Landfill possesses many site 30