Middle St. Johns - Florida Department of Environmental Protection

164
Water Quality Assessment Report: Middle St. Johns
Table 4.2 (contined)
Planning
Unit
Lake
Monroe
Unit
Lake
Monroe
Unit
Lake
Monroe
Unit
WBID
2893C
2893D
(Called
2893D
[and
2893C]
on
1998
303[d]
List)
2893D
(Called
2893D
[and
2893C]
on
1998
303[d]
List)
Waterbody
Segment
St. Johns
River
Above
Wekiva
River
Lake
Monroe
Lake
Monroe
Waterbody
Type
1998
303(d)
Parameters
of Concern
Parameters
Identified
Using
the 2002
Impaired
Surface
Waters Rule
Stream Nutrients Nutrients
(Chlorophyll
a)
Priority for
TMDL
Development *
Projected
Year for TMDL
Development *
Comments
Low 2008 Colimitation of N and P based
on a TN/TP median of 18 (326
values) during the planning
period and a median of 18
(189 values) during the verified
period. Planning period:
5 Chlorophyll a annual
means exceeded 20 μg/L
(1991–1993, 1999–2000).
327 TN values, median 1.41
mg/L. 327 TP values, median
0.08 mg/L; verified period:
2 Chlorophyll a annual
means exceeded 20 μg/L
(1999–2000). 190 TN values,
median 1.42 mg/L. 190 TP
values, median 0.08 mg/L.
Lake DO DO Low 2008 Planning period: 78/344
values below DO criterion;
verified period: 39/193
values below DO criterion.
DO met verification threshold
of IWR and nutrients
are the causative pollutant.
621 DO values, median 6.59
mg/L, mean 6.49 mg/L, range
0.08–11.2 mg/L.
Lake Nutrients Nutrients
(TSI)
Low 2008 Colimitation of N and P based
on a TN/TP median of 20
(389 values) in the planning
period and a median of 20
(320 values) in the verified
period. Planning period: 3
TSI annual means exceeded
60 (1998–2000); verified
period: 4 TSI annual means
exceeded 60 (1998–2001).
327 TN values, median 1.51
mg/L. 321 TP values, median
0.08 mg/L.