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Sgptember 2015 3-21 14-1497 3.3.3 Site Water Budget and Area Users , 3.3.3.1 Site Water Budge The Site is located in east-central peninsular Florida within the south Indian River Lagoon Basin, where the climate is characterized as subtropical humid with a high annual rainfall, and moderate temperatures. The annual average temperature is approximately 74 degrees Fahrenheit (°F) and the majority of the annual rainfall occurs during June through October (Bradner, 1994). Figure 3.3.3-1 illustrates the monthly average minimum, mean, and maximum temperature and the monthly average precipitation in the vicinity of the Site for the period from 1981 to 2010. Available rainfall data for Fort Drum, Florida showed a mean annual rainfall between the years of 1943 to 2006 of about 51.61 inches [SJRWMD, National Oceanic and Atmospheric Administration (NOAA), 2015]. Annual average lake evaporation in the area of the Site is approximately 48 inches per year; evapotranspiration is approximately 36 inches per year (Fernald and Patton, 1984). As discussed below in Section 3.3.4, based on data from the Fort Drum gaging station, the total annual average surface runoff (direct and indirect) in the vicinity of the Site is approximately 11.9 inches/year; and peak runoff rates can be 10 times the average. Therefore, the net annual average surficial aquifer recharge is approximately 3.7 inches/year [51.6-36-11.9]. Peak runoff rates may be as high as 8.8 cfs/sq. mile of drainage basin area. 3.3.3.2 Area Users Surface water and groundwater use in the vicinity of the Site is regulated by SJRWMD. Information gathered from the SJRWMD was used to prepare the following summary of water uses near the Site. Figure 3.3.3-1 presents the water use permits within 5 miles of the OCEC Unit 1. The primary water source identified by SJRWMD is from the Upper Floridan Aquifer and Floridan Aquifer, with the closest active wells located northeast of the OCEC Unit 1. To the southwest of the OCEC Unit 1, there are several Floridan Aquifer wells associated with the Florida Turnpike Fort Drum Service Plaza. 3.3.4 Surf:cial Hydrology The Site is located in the Upper St. Johns River watershed. Soils in the upland areas are generally Myakka or Basinger fine sand (>80 percent) with 0 to 2 percent slopes. These soils are poorly drained under natural conditions, with the depth to water between 6 and 18 inches. The Hydrologic Soil Group for these soils is A/D. Within the Site, there are several small surface water features including ditches, canals, ponds and wetlands. Much of the Site has been used for citrus, cattle, and other agricultural purposes. There are Attachment 1 b Ppt- 204