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Project Description --Report of Composting Site Information Tracy Material Recovery Facility and Transfer Station 30703 S. MacArthur Drive, Tracy, California 95377 Site Characteristics Climatolo_gy The climate in the Northern San Joaquin Valley is characterized by hot, dry summers and cool, moist winters. Most of the annual precipitation occurs as rain that falls during the winter and early spring months. The distribution of this precipitation is dependent on the topography and the prevailing winds. Precipitation generally increases with elevation. Most of the rain falls during the months of November through April, with December, January, and February accounting for more than one-half of the total. Average Annual Precipitation Climatologic values were calculated from measurements made at recording stations near the site. Monthly precipitation normal recorded from 1951 through 1980 at the Tracy Carbona Station (No.4-8999) (elevation 140 ft. MSL) located approximately 1 mile North of the site is 9.5 inches per year(Califomia Department of Water Resources, 1981a). Additionally, an isohyetal map of the area (San Joaquin County Department of Public Works Improvement Standards, 1991), depicts the mean annual precipitation. Based on these data and the rain fall data discussed above, it is estimated that the average annual rainfall at the Tracy MRF/Transfer and Composting Facility site is approximately 9.5 inches per year. Maximum 24-Hour Precipitation The California Department of Water Resources (1981 b) has calculated a 100 year, 24- hour precipitation of 2.75 inches for the Tracy Pumping Plant Station (No. B90-8996-01) located approximately 12 miles Northwest of the site and 2.71 inches for the Tracy Carbona Station (No. B90-8999) approximately 1 mile north of the site. A 100-year, 24- hour precipitation of 2.75 inches was used in the facility design calculations. Evaporation Evaporation values have been calculated by the California Department of Water Resources (1979), using data from four local stations recorded between 1953 and 1979. The four stations are in the proximity of the site. The average Pan A evaporation used for design of the facility is 78.7", an average of the mean evaporation rate of the four stations. 6 Edgar&Associates,Inc. Tracy Compost Fac ProjDesc121907