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September 2015 3-19 14-14979 day per foot(ft/day/ft)for the ICU at the OCEC Site. The highest value of ICU leakance within a 10- mile radius of the site is 1.0 x 10" ft/day/ft; the lowest value of ICU leakance within a I0-mile radius of the Site is 6.0 x 10'6 ft/day/ft. Floridan Aquifer System The FAS in the vicinity of the Site consists of the Upper Floridan Aquifer (UFA), Avon Park Permeable Zone (APPZ) also known as the Middle Floridan Aquifer (MFA), and Lower Floridan Aquifer (LFA) and us comprised of limestone, dolomitic limestone, and dolomite that range in age from Paleocene to Eocene. In Okeechobee County, the FAS is generally between 2,700 and 3,000 ft thick (Bradner, 1994). The Avon Park Formation, except for the APPZ/MFA, is generally less permeable than the UFA and LFA and is often referred to as the middle confining unit. Most wells installed in the Floridan Aquifer in Okeechobee County range between the depths of 750 ft to 1,200 ft b1s. In the northeastern portion of Okeechobee County, the wells are typically installed to more shallow depths between 600 and 700 ft bIs to avoid brackish water(Bradner, 1994). Upper Floridan Aquifer The top of the UFA in most of the county is encountered at a depth of approximately 400 ft;at the top of the white, foraminiferous, carbonate rocks that correspond to the Ocala Limestone. The UFA consists of the Ocala Limestone and the upper portion of the Avon Park Formation. The UFA is under artesian pressure and serves as a source of brackish water in South Florida. The base of the lowermost Underground Source of Drinking Water(USDW) is anticipated to be located in the upper portion of the Avon Park Formation at a depth of approximately 1,550 ft bls at the Site(Reese, 2004). The potentiometric surface in the vicinity of the Site typically ranges from approximately 40 to 50 ft msl and slightly fluctuates between the dry and wet seasons(Bradner, 1994). Previous testing of the yield, transmissivity and specific capacity values of wells installed within the Upper and Lower Floridan Aquifers throughout Okeechobee County are referenced from the data compiled in the USGS Water-Resources Investigations Report 92-4166, titled, "Ground-Water Resources of Okeechobee County, FL" (Bradner, 1994). The yields from wells installed within the UFA in Okeechobee County range between 50 and 1,500 gpm. The transmissivity is generally less than 10,000 ft/day, which is much lower than the typical transmissivity values in much of Florida that are between 100,000 to greater than 1,000,000 ftZ/day. Specific capacity ranges from approximately 2 to 100 gpm/ft throughout Okeechobee County in the UFA. A well installed approximately 7 miles southeast of the Site within the UFA to a depth of 686 ft bls recorded a A;%7��o Attachment 1 b '�- 202