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Middle St. Johns - Florida Department of Environmental Protection

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Water Quality Assessment Report: <strong>Middle</strong> <strong>St</strong>. <strong>Johns</strong> 305<br />

WBID<br />

Waterbody<br />

Segment Name<br />

Waterbody<br />

Type<br />

Waterbody<br />

Class<br />

1998 303(d)<br />

Parameters<br />

<strong>of</strong> Concern<br />

Parameters<br />

Identified Using<br />

the IWR<br />

Proposed<br />

<strong>St</strong>atus<br />

2997K Lake Estelle Lake 3F Dissolved Oxygen Not<br />

Impaired<br />

2997K Lake Estelle Lake 3F Fecal Coliform Not<br />

Bacteria Impaired<br />

2997K Lake Estelle Lake 3F Nutrients (TSI) Planning<br />

List<br />

2997K Lake Estelle Lake 3F Un-Ionized<br />

Ammonia<br />

Not<br />

Impaired<br />

2997L Lake Winyah Lake 3F Dissolved Oxygen Not<br />

Impaired<br />

2997L Lake Winyah Lake 3F Fecal Coliform Not<br />

Bacteria Impaired<br />

2997L Lake Winyah Lake 3F Nutrients (TSI) Verified<br />

List<br />

2997L Lake Winyah Lake 3F Un-Ionized<br />

Ammonia<br />

Not<br />

Impaired<br />

Integrated<br />

Report<br />

Category 1<br />

2<br />

2<br />

Priority<br />

for<br />

TMDL<br />

Development<br />

2<br />

Projected Comments 3<br />

Year for<br />

TMDL<br />

Development<br />

Period<br />

2<br />

(# Exceedances/ # Samples)<br />

PP= Planning Period VP= Verified<br />

3c Co-limitation by nitrogen and<br />

phosphorus based on a TN/TP<br />

median <strong>of</strong> 22 (602 values) in the PP<br />

and a median <strong>of</strong> 23 (437 values) in<br />

the VP. PP - 2 TSI annual means<br />

exceeded 60 threshold (1993-1994).<br />

VP - 1 TSI annual means exceeded<br />

40 (2002). 722 TN values, median<br />

0.79 mg/L. 720 TP values, median<br />

0.036 mg/L. Need to continue to<br />

investigate a more appropriate TSI<br />

threshold for the lakes in the<br />

Orlando Ridge area.<br />

2<br />

2<br />

2<br />

5 Medium 2008 Co-limitation <strong>of</strong> nitrogen and<br />

phosphorus based on a TN/TP<br />

median <strong>of</strong> 13 (275 values) during<br />

the PP and a median <strong>of</strong> 13 (191<br />

values) during the VP. PP - 7 TSI<br />

annual means exceeded 60 (1991-<br />

1998). VP - 3 TSI annual means<br />

exceeded 60 (1996-1998, 2001).<br />

269 TN values, median 0.81 mg/L,<br />

mean 0.85 mg/L. 269 TP values,<br />

median 0.061 mg/L, mean 0.06<br />

mg/L.<br />

2

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