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placed in the appropriate EPA -approved containers and transported on ice to the laboratory with chain -of -custody documentation. Field blanks made with organic - free water will be carried into the field and delivered with the samples to the labo- ratory. The procedures used for sampling and analysis are based on the following doc- uments: • Procedures Manual for Ground -Water Monitoring at Solid Waste Disposal Facilities (U.S. EPA, EPA-530/SW-611, August 1977) • Methods for Chemical Analysis of Water and Wastes (U.S. EPA, EPA -600/4-79/020, revised March 1979) • RCRA Draft Permit Writer's Manual -- Ground -Water Protection 40 CRF Part 264, Subpart F (GeoTrans Inc.: EPA Con- tract 68-01-6464) • Methods for Organic Chemical Analysis of Municipal and Industrial Wastewater (U.S. EPA, EPA/600-4-82/057, July 1982) • Standard Methods for the Examination of Water and Wastewater (American Public Health Association et al., 16th edition, 1985) • Test Methods for Evaluation of Solid Waste: Physical/Chemical Methods (U.S. EPA, EPA SW -846, 3rd edition, November 1986) As part of the ground -water monitoring program, the direction of ground -water flow beneath the site will be determined quarterly. The elevation of ground water in the monitoring wells will be measured, ground -water contours will be drawn, and the hydraulic gradient will be calculated. This information and the calculated velocity of ground -water flow will be presented in each quarterly report. Addition- ally, the report will include a site map showing monitoring well locations,_ a dis- cussion of analytical results, and certified analytical results. 6.10.2 Landfill Gas Monitoring Decomposition of organic waste in a landfill produces various gases, principally methane and carbon dioxide. When organic waste is initially placed in a landfill, it contains oxygen and decomposes aerobically for a short time, producing only carbon dioxide. After the oxygen is depleted, anaerobic decomposition takes 9 place, and both methane and carbon dioxide are produced. The concern over PJ9 9390218A.00..