BULLETIN NO. 68


 Table 1. Units mapped in this study. Map types are structure contour (SC) and isopach (I).

Lithostratigraphic Units Map types Hydrostratigraphic Units Map types

Hawthorn Group SC, I surficial aquifer system I
 intermediate aquifer system / c,
 Peace River Formation SC, I intermediate confining SC, I
 intermediate confining unit
 Bone Valley SC, I Flonridan aquifer system overburden I
 Member
 Arcadia Formation SC, I Floridan aquifer system SC

 Tampa Member SC, I Upper-Floridan aquifer system I

 Nocatee Member SC, I Middle Floridan confining unit SC

Suwannee Limestone SC, I

Ocala Limestone SC, I
Avon Park Formation
 SC


(e.g.,Evans and Hine, 1991; Scott,
Missimer, 2001).

 Hydrogeologic framework studies that
the southwestern Florida region include


1997;


include
Gilboy


(1985), Johnston and Bush (1988), Miller (1986),
Ryder (1985) and Reese and Richardson (2008).
Maps depicting the thickness and extent of the
Floridan aquifer system (FAS), the "intermediate
aquifer" and intermediate "confining beds" include
Buono and Rutledge (1978), Wolansky et al.
(1979a), Wolansky et al. (1979b), Wolansky and
Garbode (1981), Corral and Wolansky (1984) and
Miller (1986). Allison et al. (1995) present a map
of the top of rock of the FAS in the Suwannee
River region, located along the northeast part of
the SWFWMD study area. Meyer (1989) provides
a comprehensive characterization of the
hydrogeologic framework of southern Florida.
Spechler and Kroening (2007) present a
comprehensive study of Polk County hydrology.
Reese (2000) and Missimer and Martin (2001)
present the hydrogeology and water quality of the
FAS in Lee, Hendry and Collier Counties.

 Statewide hydrochemical characterizations of
the upper FAS have focused on aquifer-system
mineralogy and processes that led to observed
native groundwater chemistry (e.g., Plummer,


1977; Sprinkle, 1989), and hydrochemical facies
(Katz, 1992). Upchurch (1992) characterized not
only hydrochemical facies, but also naturally
occurring and anthropogenic constituents in the
FAS. Other studies that focused on regional
aspects of FAS hydrochemistry (i.e., salinity,
solute transport and dolomitization) include Back
and Hanshaw (1970), Cander (1994, 1995),
Hanshaw and Back (1972), Jones et al. (1993),
Maliva et al. (2002), Randazzo and Zachos
(1984), Sacks (1996), Sacks and Tihansky
(1996), Steinkampf (1982), Swancar and
Hutchinson (1995), Trommer (1993), and Wicks
and Herman (1994, 1996). Budd et al. (1993),
Budd (2001, 2002) and Budd and Vacher (2004)
have studied in detail the role of permeability,
compaction and cementation in FAS carbonates
of southwest Florida. An overview of surface-
water and groundwater hydrology is provided by
Wheeler et al. (1998). In contrast to these regional
characterizations, Tihansky (2005) identified the
complex relation between water quality,
groundwater flow patterns and structural
heterogeneity within the FAS in northeastern
Pinellas County by employing diverse
hydrogeological and geophysical analyses.

 Hydrochemical studies of the intermediate
aquifer system/intermediate confining unit