Middle St. Johns - Florida Department of Environmental Protection

Water Quality Assessment Report: Middle St. Johns
161
Table 4.2 (contined)
Planning
Unit
Lake
Jesup
Lake
Jesup
Lake
Jesup
WBID
2997A
2997B
2997D
Waterbody
Segment
Howell
Creek
Howell
Lake
Lake
Minnehaha
Waterbody
Type
Stream
Lake
Lake
1998
303(d)
Parameters
of Concern
Parameters
Identified
Using
the 2002
Impaired
Surface
Waters Rule
Total
Coliform
Bacteria
Nutrients
(TSI)
Nutrients
(TSI)
Priority for
TMDL
Development *
Projected
Year for TMDL
Development *
Comments
Medium 2008 Planning period: 7/36 values
exceed criterion; verified
period: 6/22 values exceed
criterion. Coliform median
680 colonies/100 ml, range
60–8900 colonies/100 ml.
No more than 2 values per
month.
Medium 2008 Colimitation of N and P based
on a TN/TP median of 19
(197 values) during the planning
period and a median of
19 (182 values) during the
verified period. Planning
period: 3 TSI annual means
exceeded 60 (1997, 1999,
2000); verified period: 4
TSI annual means exceeded
60 (1997, 1999, 2000, 2002).
203 TN values, median 0.95
mg/L, mean 1.03 mg/L. 224
TP values, median 0.05 mg/L,
mean 0.06 mg/L.
Medium 2008 Colimitation by N and P
based on a TN/TP median
of 22 (321 values) during the
planning period and a median
of 24 (246 values) during
the verified period. Planning
period: 1 TSI annual
means exceed threshold of
60 (1997); verified period: 2
TSI annual means exceed
threshold of 60 (1997, 2001).
347 TN values, median 0.79
mg/L, mean 0.82 mg/L. 400
TP values, median 0.04 mg/L,
mean 0.05 mg/L.