Middle St. Johns - Florida Department of Environmental Protection

Water Quality Assessment Report: Middle St. Johns
171
Table 4.2 (contined)
Planning
Unit
Wekiva
River
Wekiva
River
WBID
Waterbody
Segment
3004 Little
Wekiva
Canal
Waterbody
Type
1998
303(d)
Parameters
of Concern
Parameters
Identified
Using
the 2002
Impaired
Surface
Waters Rule
Stream Nutrients Nutrients
(Chlorophyll
a)
3004C Lake Lawne Lake Nutrients
(TSI)
Priority for
TMDL
Development *
Projected
Year for TMDL
Development *
Comments
Low 2008 Colimitation by N and P
based on a TN/TP median
of 14 (156 values) during the
planning period and a median
of 17 (84 values) during
the verified period. 84 TN
values, median 1.16 mg/L.
84 TP values, median 0.08
mg/L. Planning period: 6
Chlorophyll a annual means
exceeded 20 μg/L (1991,
1992, 1994, 1996, 1998,
1999); verified period: 3
Chlorophyll a annual means
exceeded 20 μg/L (1996,
1998, 1999). The annual
Chlorophyll a concentrations
were: 1991–20.5 μg/L, 1992–
20.7 μg/L, 1993–13.6 μg/L,
1994–23.2 μg/L, 1996–25.1
μg/L, 1997–13.0 μg/L, 1998–
20.0 μg/L, 1999–26.6 μg/L,
and 2000–10.0 μg/L.
Medium 2008 Colimitation by N and P
based on a TN/TP median
of 13 (320 values) during
the planning period and a
median of 17 (98 values)
during the verified period.
Planning period: 6 TSI
annual means exceeded 60
(1991–1994, 1996, 1997);
verified period: 2 TSI annual
means exceeded 60 (1996,
1997). 27 TN values, median
1.48 mg/L, mean 1.57 mg/L.
404 TP values, median 0.128
mg/L, mean 0.203 mg/L.