Middle St. Johns - Florida Department of Environmental Protection

152
Water Quality Assessment Report: Middle St. Johns
Table 4.2 (contined)
Planning
Unit
Deep
Creek
Unit
Deep
Creek
Unit
Deep
Creek
Unit
Deep
Creek
Unit
Econlockhatchee
River
WBID
Waterbody
Segment
2931 Lake
Winnemissett
2964A
2964A
2964A
Lake
Harney
Lake
Harney
Lake
Harney
2991 Econlockhatchee
River
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
Lake Lead Medium 2008 Planning period: 8/26 values
exceed criterion; verified
period: 6/21 values exceed
criterion.
Lake DO DO Low 2008 Planning period: 90/306
values below DO criterion;
verified period: 31/121
values below DO criterion.
DO met verification threshold
of IWR and nutrients
are the causative pollutant.
509 DO values, median 6.27
mg/L, mean 6.32 mg/L, range
11.8–0.42 mg/L.
Lake
Mercury in
Fish
Lake Nutrients Nutrients
(TSI)
Stream
Fecal
Coliform
Bacteria
Medium 2011 Mercury in Fish met verification
threshold of IWR. Fish
tissue levels in 20 samples
averaged 0.5420 ppm in
2000.
Low 2008 Colimitation of N and P based
on a TN/TP median of 24
(541 values) during the planning
period and a median of
19 (242 values) during the
verified period. Planning
period: 1 TSI annual mean
exceeded 60 (2000); verified
period: 2 TSI annual means
exceeded 60 (2000–2001).
548 TN values, median 1.28
mg/L. 554 TP values, median
0.052 mg/L.
Medium 2008 Planning period: 16/116
values exceed criterion;
verified period: 5/21 values
exceed criterion. Coliform
median 110 colonies/100
ml, range 10–2301 colonies/
100 ml. No more than 3
values per month.