Fort Walton Beach Resolution — 2008-10-Adopting 2008 EAR — reading text

Urban land (Soil Type 27). Well No. 3, located at 55 Wright NW, is Chipley ( 0 to 5 Soil Type ( 0 to 5 slopes) ( Soil Type 4), Foxworth sand ( 0 to 5 22), and Urban land ( Soil Type 27). percent slopes) ( Soil Type 12), Rutledge sand ( depressional) ( Soil Well No. 8, located at 430 Holmes NW, is by Chipley to 5 percent slopes) ( Soil Type 4), Dorovan muck flooded) (Soil Type 6), percent slopes) ( Soil Type 8), and Rutledge sand ( depressional) ( Soil SECTION 3 - FLORIDAN AQUIFER All potable water delivered to the City nine wells tapping the upper limestone southern Okaloosa County since the 1950' s potable water supply for this area has led to coast. However, since 2000, the levels have risen to the same levels that existed in REGIONAL WATER SUPPLY PLAN 9 CITY OF FORT WALTON BEACH  This chapter will describe in some of southern with etnphasis on the Floridan is drawn heavily from Water Resources Investigations Report et. al, 1985). 3. 1 POTABLE WATER SOURCE City of Fort Walton Beach' s water has nine wells that the Aquifer with production zones that range from 455 to 875 feet below level. The Floridan Aquifer is one of the sources of underlies a 100,000 square mile area includes all of Alabama and South Carolina. In Okaloosa the Floridan is Compared to other locations, here groundwater movement in the Floridan is very III). REGIONAL WATER SUPPLY PLAN 10 CI1Y OF FORT WALTON BEACH 3. 2 AQUIFER INFORMATION In the southern Okaloosa area there are three distinct The Sand- and-Gravel Aquifer is the upper most feet below the surface to over 200 feet in some domestic lawn irrigation wells. This aquifer typically has a contaminants such as iron, manganese, nitrite and contamination than the Floridan Aquifer. The City, completed a report titled, Evaluation rif the Sand & on April 10, 2000. The report identifies the Sand drinking water for Fort Walton Beach with REGIONAL WATER SUPPLY PLAN 11 CI1Y OF FORT WALTON BEACH  Aquifer is of day and sand (pensacola with very low Aquifer is the source water of in Okaloosa County. IS a confining layer of In Walton area, has a much higher concentration of chloride and, due to the cost of treatment to remove the chloride, it is considered unsuited for potable use. 3.3 GROUND AND SURFACE In southern Okaloosa County, and the Floridan Aquifer range in age from Eocene to and dolomite. The following sections describe the system underlying the Fort Walton Beach area. Gravel Aquifer consists fine to coarse sand silty and peat beads. The aquifer thickens east to west. In the Fort area, yield highly variable. is Fort Walton Beach, the water The Sand is tapped sand and hydrogen sulfide a pH of With additional water source, as indicated in Fabre Engineering, Inc.' s 2000 report. southern Okaloosa separates it from the of between the two at a particular place. It also waters from moving downward into the area. fthe Floridan Aquifer: UtJper limestone l!- The upper limestone of the Floridan in central and southern Okaloosa County. The interconnected, intergranular pore spaces, small and Yields from wells are ordinarily 250 to 1000 GPM and the water is Water from the upper limestone Floridan is with minimal treatment required. between 18 individual well. Hardness, as calcium ranges up to 280 the pH generally ranges between 7. 5 and 8.5. REGIONAL WATER SUPPLY PLAN 12 CITY OF FORT WALTON BEACH  Bucatunna Clay limestone of the and separates it hydraulically limestone. The bed underlies the entire stretches to the north sixteen miles. The Bucatunna Clay is composed of low-permeability clay and which movement of water between upper and lower limestone formations. limestone of the Floridan consists of carbonate rocks in the the coastal area where the Bucatunna Clay is the Bucatunna and is hydraulically separated by it from the limestone of the As in the upper limestone, water occurs confined and moves primarily through interconnected and pores and solution chloride excess of 1, 000 mg/ L occupies thickness of the lower Okaloosa County. Because of this, the lower is not used as a source of water. 4 HYDRAULICS OF THE FLORIDAN AQUIFER 3.. of the Floridan Aquifer is of Alabama, where the the Aquifer may be recharged Pensacola Clay confining bed when ill the overlying Sand and Gravel Aquifer ( See Graphic IV). REGIONAL WATER SUPPLY PLAN 13 CITY OF FORT WALTON BEACH  Graphic IV. In a confined aquifer, such as the than atmospheric, moving from points of movement of water depends on the and on the difference in head between two measured water levels of equal artesian aquifer, a map of an height that water will rise in a well discharge, and water movement in the Floridan Patterns of recharge, potentiometric high in northern Okaloosa and Walton surface is Aquifer moves from these hydraulically upgradient areas southward into southern Walton Counties. Some water from the recharge area is withdrawn the many wells limestone of the Floridan Aquifer. water to Gulf Choctawhatchee River and Bay, and perhaps to the Sand and Gravel REGIONAL WATER SUPPLY PLAN 14 CITY OF FORT WALTON BEACH  Due to the paucity of data, it is conclusions within the lower limestone of the is from upper limestone by the Bucatunna movement is believed to be small, however, owing to the thickness and the density of the primarily to pumping, the potentiometric the upper limestone Floridan Aquifer (See Graphic V)has declined significantly in southern Okaloosa County. Before the withdrawal of amounts of water Aquifer, the potentiometric surface was controlled the overlying and underlying confining the natural recharge discharge. In to of the Aoridan Aquifer were 40 to 65 above sea naturally. Subsequent development, this pattern. \ Vater levels had sea level by 1995. REGIONAL WATER SUPPLY PLAN 15 CITY OF FORT WALTON  southern Okaloosa County, the surface of the highly IS higher that of the upper limestone, at the result of lowered heads in the limestone due to pumping. At Fort Walton Beach, the water in the lower limestone is approximately five feet above sea level in contrast to water levels of 110 feet below sea in the limestone. 3. 5 WATER QUALITY AND UPPER FLORIDAN AQUIFER The Roridan Aquifer is source of water for the City of Fort water service area. water quality of the Upper is not treatment prior to the water distribution. The water levels in the have have actually risen to levels that were present over 20 ago. Walton area, the water quality within the Upper is not require any extensive treatment; only aeration and chlorination are required to meet all requirements. The raw water quality parameters have all constituents are well below the maximum set the U.S. Agency (USEPA) or the Florida Department Protection (FDEP). When comparing the City' s wells, it ryJell Nos. 6, 7, & 10) have lower levels of sodium, and total in the Downtown and Commerce and Technology Park areas. following charts present the rune in the Fort Walton Beach water through REGIONAL WATER SUPPLY PLAN 16 CI1Y OF FORT WALTON BEACH  Graphic VI. Sodium ill of Water Wens Sodium Concentrations in Potable Water Wells 140 120 100 so C! E 60 40 20 three wells located in the Golf Club area ('\ Vell Nos. 6, 7, & 10) concentrations that are less than the six wells in the southern portion of the City. Since levels in the six southern wells have leveled off at a concentration of 110 REGIONAL WATER SUPPLY PLAN 17 CI1Y