Middle St. Johns - Florida Department of Environmental Protection

174
Water Quality Assessment Report: Middle St. Johns
waterbody in the assessment unit has been assessed, and other waters in the
watershed may not be impaired.
Since the October 2003 update of the 303(d) list, further data became
available for assessment of the basin, and these data were used to update
the listing status of waters. Table F.1 in Appendix F contains the listing
status of all assessed waters in the basin as of May 2004. An order containing
the initial Verified List of Impaired Group 2 Waters (Verified List) was
signed by the Department’s Secretary on May 27, 2004. The order was
officially noticed in the May 28, 2004, edition of the Florida Administrative
Weekly, which started a 21-day period to file a petition challenging the
order and a 30-day period to appeal the order.
Pollutant Causing Impairments
Of the 427 water segments in the Middle St. Johns Basin, 58 waters
are verified as being impaired for at least 1 parameter, and a TMDL is
required for each of these waters. A total of 88 TMDLs are required for
these waters following the methodology in Appendix E. The Lake Jesup
planning unit has the largest number of TMDL requirements, being
identified as 22, followed by the Wekiva River and Econlockhatchee River
planning units with 18 TMDLs. At this stage, no TMDL requirement has
been identified for the Alexander Spring Creek.
Table 4.3 lists the number of TMDLs required for each planning unit
and the parameters under concern.
Table 4.4 lists the number of impairments for each parameter under
concern in the Middle St. Johns River Basin. Ten pollutant parameters
are identified in the basin. The most common parameter exhibiting
impairment throughout the basin is the nutrient. In 7 of the 9 planning
Table 4.3: Number of TMDLs Required for Each Planning Unit
Planning Units
Number of
TMDLs
Required
Parameters under Concern
Lake Jesup 22 Nutrients, unionized ammonia,
DO, iron, fecal coliforms, and
total coliforms
Wekiva River 18 Nutrients, DO, BOD fecal
coliforms, total coliforms, and
mercury in fish
Econlockhatchee River 18 Nutrients, DO, BOD, fecal coliforms,
total coliforms, and iron
Lake Monroe 12 Nutrients, DO, fecal coliforms,
and iron
Deep Creek 9 Nutrients, DO, iron, lead, and
mercury in fish
Lake George 7 Nutrients, DO, and mercury in
fish
Lake Kerr 1 Mercury in fish
Lake Woodruff 1 Nutrients
Alexander Springs Creek 0