Middle St. Johns - Florida Department of Environmental Protection

336 Water Quality Assessment Report: Middle St. Johns
WBID
Waterbody
Segment Name
Waterbody
Type
Waterbody
Class
1998 303(d)
Parameters
of Concern
Parameters
Identified Using
the IWR
Proposed
Status
2929A Black Water Creek Stream 3F Arsenic Not
Impaired
2929A Black Water Creek Stream 3F Biology Not
Impaired
2929A Black Water Creek Stream 3F Cadmium Cadmium Not
Impaired
2929A Black Water Creek Stream 3F Chromium3 Not
Impaired
2929A Black Water Creek Stream 3F Copper Not
Impaired
2929A Black Water Creek Stream 3F Dissolved Dissolved Oxygen Not
Oxygen
Impaired
2929A Black Water Creek Stream 3F Fecal Coliform
Bacteria
Not
Impaired
2929A Black Water Creek Stream 3F Iron Iron Not
Impaired
Integrated
Report
Category 1
2
2
Priority
for
TMDL
Development
2
Projected Comments 3
Year for
TMDL
Development
Period
2
(# Exceedances/ # Samples)
PP= Planning Period VP= Verified
2 Delist. PP - 4/90 values exceed
criterion, range 0.00 - 13.6 ug/L,
mean 0.46 mg/L. VP - 2/71 values
exceed criterion, range 0.00 - 3.6
ug/L, mean 0.21 ug/L.
2
2
2 Delist. Dissolved oxygen is naturally
low, and bioassessment data
indicate that aquatic life use support
is being maintained (9 passing
bioassessments 1992 - 2001.
Nutrients (TN and TP) are within
acceptable ranges. 176 DO values,
median 5.4 mg/l, mean 5.45 mg/l,
range 0.96 - 11.2 mg/l. 119 TN
values, 1.35 mg/l. 128 TP values,
0.05 mg/l. PP -50/138 values below
DO criterion. VP - 39/120 values
below DO criterion.
2
2 Delist. PP - 16/98 values exceed
criterion, range 0.023 - 2.583 ug/L,
mean 0.584 ug/L. VP - 10/86
values exceed criterion, range 0.023
- 2.583 ug/L, mean 0.584 ug/L.