Middle St. Johns - Florida Department of Environmental Protection

Water Quality Assessment Report: Middle St. Johns
165
Table 4.2 (contined)
Planning
Unit
Lake
Monroe
Unit
Lake
Monroe
Unit
Lake
Monroe
Unit
Lake
Monroe
Unit
WBID
2893E
2893E
Waterbody
Segment
St. Johns
River
Above Lake
Monroe
St. Johns
River
Above Lake
Monroe
Waterbody
Type
1998
303(d)
Parameters
of Concern
Parameters
Identified
Using
the 2002
Impaired
Surface
Waters Rule
Priority for
TMDL
Development *
Projected
Year for TMDL
Development *
Comments
Stream DO Medium 2008 DO met verification threshold
of IWR, and nutrients are the
causative pollutant. Planning
period: 38/101 values below
DO criterion; verified period:
24/77 values below criterion.
262 DO values below criterion,
mean 5.18 mg/L, median
5.36 mg/L, range 0.43–10.76.
Stream
Nutrients
(Chlorophyll
a)
2951 Lake Marie Lake Nutrients
(TSI)
2962 Smith
Canal
Medium 2008 Colimitation of N and P based
on a TN/TP median of 19
(102 values) in the planning
period and a median of 18
(80 values) in the verified
period. Planning period: 0
Chlorophyll a annual means
exceeded 20 μg/L; verified
period: 1 Chlorophyll
a annual means exceeded
20 μg/L (2002). 82 TN values,
median 1.39 mg/L. 81 TP
values, median 0.08 mg/L.
Medium 2008 Colimitation of N and P based
on a TN/TP median of 26 (66
values) during the planning
period and a median of 24
(48 values) during the verified
period. Planning period:
1 TSI annual mean exceeded
60 (1996); verified period: 1
TSI annual mean exceeded
60 (1996). 48 TN values,
median 1.04 mg/L. 48 TP
values, median 0.05 mg/L.
Stream DO DO Low 2008 Planning period: 2/7 values
below DO criterion; verified
period: 16/31 values below
DO criterion. DO met verification
threshold of IWR and
BOD is the causative pollutant.
BOD median = 2.1 mg/L.
36 DO values, median 5.21
mg/L, mean 5.31 mg/L, range
1.99–10.17mg/L.