Middle St. Johns - Florida Department of Environmental Protection

Water Quality Assessment Report: Middle St. Johns 291
WBID
Waterbody
Segment Name
Waterbody
Type
Waterbody
Class
1998 303(d)
Parameters
of Concern
Parameters
Identified Using
the IWR
Proposed
Status
2986D Lake Alma Lake 3F Nutrients (TSI) Verified
List
2986E Lake Searcy Lake 3F Nutrients (TSI) Verified
List
Integrated
Report
Category 1
Priority
for
TMDL
Development
Projected
Year for
TMDL
Development
Comments 3
(# Exceedances/ # Samples)
PP= Planning Period VP= Verified
Period
5 Medium 2008 Co-limitation of nitrogen and
phosphorus based on a TN/TP
median of 14 (98 values) during the
PP and a median of 14 (98 values)
during the VP. PP - 4 TSI annual
means exceeded 60 (1997-2000).
VP - 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.
5 Medium 2008 Co-limitation of nitrogen and
phosphorus based on a TN/TP
median of 25 (105 values) in the PP
and a median of 22 (174 values) in
the VP. PP - 3 TSI annual means
exceeded 60 (1998-2000). VP - 5
TSI annual means exceeded 60
(1998-2002). 174 TN values,
median 1.17 mg/L, mean 1.23 mg/L.
174 TP values, median 0.05 mg/L,
mean 0.06 mg/L.
2988 Wharf Creek Stream 3F No Data 3a
2990 Salt Creek Stream 3F Biology Planning
List
3c Biology met verification threshold of
IWR but need to identify causative
pollutant. 2 failed bioassessments in
the verified period.
2990 Salt Creek Stream 3F Dissolved Oxygen Verified
List
2990 Salt Creek Stream 3F Iron Verified
List
5 Medium 2008 PP - 66/94 values below DO
criterion. VP - 44/72 values below
DO criterion. DO met verification
threshold of IWR and nitrogen is
causative pollutant (TN median =
1.71 mg/L). 97 DO values, median
3.1 mg/L, mean 3.74 mg/L, range
0.17 - 10 mg/L.
5 Medium 2008 PP - 15/67 values exceed criterion.
VP - 15/67 values exceed criterion.