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in a fairly dry area, a relatively small rainstorm (1-year, 24-hour rainfall for the area is 1.25 inches) could cause exposed waste residues or leachate to wash into the creek (6). The exposure of hazardous wastes to rain and stormwater runoff appears unlikely since refuse is covered on a daily basis (7). Stream flow in the Corral Hollow Creek is intermittent and does not serve as a stock or human drinking source. The creek flows in the direction of the California Aqueduct/Delta Mendota canal complex but does not flow into the canals. Instead, it appears to terminate several hundred yards from the canals. The canal complex itself is located approximately 1.5 miles northeast of the landfill. Over 50 percent of the Tracy area's blended water system is supplied by these surface waters (14). The probable direction of surface water runoff toward the canals is via Corral Hollow Creek. The Delta Mendota canal and California aqueduct are elevated and bermed so a release of hazardous compounds through Corral Hollow Creek appears to be unlikely (3). 3.5 AIR Air monitoring was conducted at CHSL as part of the site's Air Solid Waste Assessment Test (Air SWAT). The following activities took place during the Air SWAT Program: gas stream characterization, ambient air testing, and off-site gas migration tests. The landfill gas characterization study was based on analyses of samples obtained from monitoring wells within the landfill and one sample collected during an integrated surface walk. Five monitoring wells were installed for the gas characterization study (See Figure 3.4). Ambient Air sampling at CHSL was conducted within 9 feet of the ground surface. Field personnel representing EMCON Associates sampled the gas monitoring wells on February 17 and April 7, 1988, at least 24 hours after they were installed. Within 72 hours of collection, the landfill gas samples 3-10 sa/tm/chl/si