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1 • 0 3.0 SITE SETTING The following sections provide the site setting and include a description of the site physiographic and climatic conditions in the vicinity of the CHSL, and the geology and hydrogeology underlying the CHSL. 3.1 PHYSIOGRAPHIC AND CLIMATIC SETTING 3.1.1 Landfill Location The CHSL is located in southern San Joaquin County, south of the City of Tracy (Figure 1). The site address is 31130 Corral Hollow Road, and the landfill is situated southeast of the intersection of Corral Hollow Road and State Route 580. The site occupies a portion of Section 18 in Township 3 South, Range 5 East of the Mount Diablo Baseline and Meridian system. Physiographically, the site is located on the northeastern flank of the Diablo Range at the transition to the San Joaquin Valley. The site is bounded by Corral Hollow Creek on its eastern side and Corral Hollow Road on its western side. The ground surface generally slopes to the northeast, with ground surface elevations ranging from approximately 240 feet above mean sea level (amsl) at the northeastern corner of the site to approximately 330 feet amsl at the southwestern corner of the site. ' The landfill waste prism forms a roughly rectangular pyramid that rises from the adjacent terrain to a maximum top deck elevation of approximately 352 feet amsl. 3.1.2 Climate The climate for the region surrounding the CHSL is Mediterranean, characterized by mild, wet winters and cool summers. According to the California Department of Resources, California Irrigation Management Information System (CIMIS), during the last 10 years, temperatures range from a minimum average of 45.6 degrees Fahrenheit to a maximum average of 71.6 degrees in the nearby city of Tracy. The area surrounding the CHSL receives an average of about 10 inches of rain per year (CIMIS, 2011), with approximately 70 percent of rainfall occurring between November and April of each year. 3.1.3 Landfill Configuration The CHSL is a closed, unlined Class III landfill. The landfill property is approximately 58 acres, with a refuse footprint that is approximately 44 acres (including recently - discovered refuse outside the closure cap). In 1995 a prescriptive final cover was constructed consisting of a foundation layer, a low -permeability clay layer, and an EMP Report — Phase IGeo-Loic Page ■ 2 Corral Hollow Sanitary Landfill ASS O C 1 ATE SS February 1, 2012