Middle St. Johns - Florida Department of Environmental Protection

158
Water Quality Assessment Report: Middle St. Johns
Table 4.2 (contined)
Planning
Unit
Lake
Jesup
Lake
Jesup
Lake
Jesup
Lake
Jesup
Lake
Jesup
WBID
Waterbody
Segment
Waterbody
Type
1998
303(d)
Parameters
of Concern
2981 Lake Jesup Lake Unionized
Ammonia
Parameters
Identified
Using
the 2002
Impaired
Surface
Waters Rule
Unionized
Ammonia
Priority for
TMDL
Development *
Projected
Year for TMDL
Development *
Comments
High 2004 Planning period: 47/283
values exceed criterion;
verified period: 27/154
values exceed criterion.
2985 Chub Creek Stream DO Medium 2008 Planning period: 58/67
values below DO criterion;
verified period: 40/47 values
below DO criterion. DO met
verification threshold of IWR,
and N and P are causative
pollutants (TN median =
2.3 mg/L, TP median = 0.37
mg/L). 68 DO values, median
1.99 mg/L, mean 2.61 mg/L,
range 8.55–0.29 mg/L.
2985 Chub Creek Stream Iron Medium 2008 Planning period: 15/44
values exceed criterion;
verified period: 15/44 values
exceed criterion.
2985 Chub Creek Stream Nutrients
(Chlorophyll
a)
2986D Lake Alma Lake Nutrients
(TSI)
Medium 2008 Colimitation of N and P based
on a TN/TP median of 10 (67
values) during the planning
period and a median of 10
(47 values). Planning period:
3 Chlorophyll a annual
means exceeded 20 μg/L
(1995–1997); verified period:
2 Chlorophyll a annual means
exceeded 20 μg/L (1996–
1997). 47 TN values, median
2.3 mg/L. 68 TP values,
median 0.37 mg/L.
Medium 2008 Colimitation of N and P based
on a TN/TP median of 14 (98
values) during the planning
period and a median of 14 (98
values) during the verified
period. Planning period: 4
TSI annual means exceeded
60 (1997–2000); verified
period: 4 TSI annual means
exceeded 60 (1997–2000).
99 TN values, median 2.2
mg/L, mean 2.28 mg/L. 98
TP values, median 0.16 mg/L,
mean 0.18 mg/L.