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3.0 SITE CHARACTERISTICS 3.1 TOPOGRAPHY The terrain at the landfill and surrounding vicinity consists of a relatively featureless plain. Both the north and south branches of the South Fork of Little John's Creek (North and South Branches) traverse the site, generally flowing from the east to the west. Original ground surface elevations range from 30 to 40 feet above mean seal level (amsl) (see Figure 3). Currently developed portions of the site reach a maximum elevation of approximately 80 feet arnsl in the existing Austin Road Landfill area, and approximately 130 feet amsl in the existing Forward Landfill area, see Drawing 2 (Site Plan). 3.2 CLIMATE The climate of the region is typical of the California Central Valley. Winters are generally cold and wet with fog, while summers are hot and dry. Climatological data were gathered from representative weather stations near the site. Representative climatologic stations were selected based on their proximity to the site and reliable period of records for the station (30 years or more). 3.2.1 TEMPERATURE Normal monthly temperatures were calculated from the Stockton Weather Station office (WSO) (No. 8558, latitude 37°54, longitude 121°15', Elevation 22 feet amsl), located approximately 3 miles west of the site, from data collected from 1948 through 1990. These temperatures ranged from a minimum average temperature of 42.5°F in January to a maximum average temperature of 78.0°F in August, with an annual mean temperature of 61.5°F (National Climatic Data Center, 1990). 3.2.2 PRECIPITATION Precipitation at the project site is typical of the Central Valley region. Rainfall is seasonal, with approximately 90 percent of the rainfall occurring between November and April. Snowfall is unusual at the site. Forward Landfill JTD 3-1 L:\Allied\2000.193\Reports\]d:Sec-3.0:05/21/02 BRYAN A.STIRRAT 6 ASSOCIATES