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(District) in June 1987 and subsequently approved by the District on <br /> November 25, 1987 (see Appendix B) . EMCON implemented the approved <br /> workplan from February through May, 1988, as summarized below. <br /> • Gas stream characterization - One subsurface sample was <br /> obtained from each of five gas monitoring wells installed <br /> for the ASWAT program. These samples were analyzed for <br /> the 10 volatile organic compounds (VOCs) specified in the <br /> Guidelines and the major landfill gas components: oxy- <br /> gen, nitrogen, carbon dioxide, and methane. In addition, <br /> 1 integrated surface walk sample was collected over the <br /> active landfill and analyzed for the 10 VOCs and methane. <br /> • Ambient air quality - Ambient air samples were collected <br /> at two locations--one upwind and one downwind--and ana- <br /> lyzed for the 10 VOCs specified in the Guidelines. <br /> • Gas migration off site - The percentage of total organic <br /> compounds measured as methane was determined at six loca- <br /> tions near the site perimeter. <br /> The followingdeviations from the workplan will be discussed in their <br /> P <br /> respective sections: <br /> • Locations of two gas monitoring wells and the ambient air <br /> samplers were adjusted based on site conditions <br /> • VOC analyses were performed by gas chromatograph/mass <br /> spectrometer (GC/MS) <br /> • Elevated detection limits for ethylene dibromide and <br /> chloroform in the landfill gas samples <br /> The purpose of this report is to resent the ASWAT results for the <br /> P P P P <br /> Corral Hollow Sanitary Landfill , including the results of field and <br /> laboratory quality assurance programs. Supporting information (i .e. , <br /> the ASWAT proposal , District letter of approval , meteorological data, <br /> field information, and complete analytical reports) is provided in the <br /> appendices. <br /> PJ9 9390304.00D 1-2 Rev. 0 09/20/88 <br />