## Lake Okeechobee Group 1 Basin/ Southeast District - Verified List (Cycle 1 Revised and Readopted May 2009) Hydrologic Unit: Lake Okeechobee

May 14, 2009 1 of 6 Florida Department of Environmental Protection OGC Case

Number Planning Unit WBID Water Segment Name Waterbody Type Waterbody Class1 

### 1998 303(d) Parameters of Concern Parameters Assessed Using the 2007 Impaired

Surface Waters Rule (IWR) Concentration Causing Impairment Priority for TMDL Development2 

### Comments3 

### (# Exceedances/# Samples) PP = Planning Period VP = Verified Period

09-2072 CTP Complex 3199A TURKEY SLOUGH STREAM 3F Dissolved Oxygen 

### <5.0 mg/l Medium PP = 145 / 148; VP = 91 / 99 Impaired by the IWR threshold and nutrients were found to be the causative pollutant. TN (2.2 mg/L) exceeded the threshold of 1.6 mg/L. TP (0.75 mg/L) exceeded the threshold of 0.22 mg/L. TN/TP median = 2.8 standard

deviation of 2.2, range of 1.26 - 12.2, observations 122. New listing from Cycle 2.

09-2073 CTP Complex 3199B CHANDLER HAMMOCK SLOUGH STREAM 3F Dissolved Oxygen Dissolved Oxygen 

### <5.0 mg/l Low PP = 39 / 45; VP = 25 / 38 Impaired by the IWR threshold and nutrients were found to be the causative pollutant. TN (3.1 mg/L) exceeded the threshold of 1.6 mg/L. TP (1.2 mg/L) exceeded the threshold of 0.22. BOD (4.65 mg/L) exceeded the threshold of 2.0 mg/L and had 6 observations. TN/TP median = 2.3, standard deviation of 2.5, range 1.1 - 12.1, observations 44. A TMDL has already been proposed by EPA, 9/30/2006.

09-2074 CTP Complex 3199B CHANDLER HAMMOCK SLOUGH STREAM 3F Nutrients Nutrients (Chlorophylla) 

### Median TN = 3.10 mg/L Low The annual average Chla value exceeded the IWR threshold of 20 ug/L in 2006 (60.87 ug/L). TP (1.20 mg/L) exceeded the threshold of 0.22 mg/L. Data indicate that the WBID is nitrogen limited (TN/TP median = 2.34, standard deviation of 2.48, range 1.09 -12.13, observations 44). A TMDL has already been proposed by EPA, 9/30/2006.

09-2075 CTP Complex 3205C POPASH SLOUGH STREAM 3F Specific Conductance 

### Shall not be increased above 1275 umhos/cm Medium PP=15/41; VP=90/153. New listing from Cycle 2.

09-2076 CTP Complex 3205C POPASH SLOUGH STREAM 3F Dissolved Oxygen 

### <5.0 mg/l Medium PP=40/41; VP=116/151 Impaired by the IWR threshold and nutrients were found to be the causative pollutant. TN (1.8 mg/L) exceeded the threshold of 1.6 mg/L. TP (0.3 mg/L) exceeded the

threshold of 0.22mg/L. BOD (2.0 mg/L) did not exceed the threshold of 2.0 mg/L and had 22 observations. TN/TP median = 6.29, standard deviation 13.35, range 0.22 - 65.2, observations 34. New listing from Cycle 2.

09-2077 CTP Complex 3205C POPASH SLOUGH STREAM 3F Nutrients (Chlorophylla) 

### Median TN = 1.80 mg/L Medium The annual average Chla value exceeded the IWR threshold of 20 ug/L in 2006 (28.66 ug/L). TP (0.3 mg/L) exceeded the threshold of 0.22 mg/L. Data indicate that the WBID is nitrogen limited (TN/TP median = 6.30, standard deviation 13.36, range 0.22 -

65.2, observations 34). New listing from Cycle 2.

09-2078 Lake Okeechobee 3212A - 3212I LAKE OKEECHOBEE LAKE 1 Mercury (Based on fish consumption advisory) 

### Exceeds DOH threshold (>0.3 mg/kg) High* Listed based on 12 large mouth bass tissue samples (average Hg = 0.33 mg/kg) from 2005. New listing from Cycle 2.

## Lake Okeechobee Group 1 Basin/ Southeast District - Verified List (Cycle 1 Revised and Readopted May 2009) Hydrologic Unit: Lake Okeechobee

May 14, 2009 2 of 6 Florida Department of Environmental Protection OGC Case

Number Planning Unit WBID Water Segment Name Waterbody Type Waterbody Class1 

### 1998 303(d) Parameters of Concern Parameters Assessed Using the 2007 Impaired

Surface Waters Rule (IWR) Concentration Causing Impairment Priority for TMDL Development2 

### Comments3 

### (# Exceedances/# Samples) PP = Planning Period VP = Verified Period

09-2079 NHLMS Complex 3203A NUBBIN SLOUGH STREAM 3F Dissolved Oxygen Dissolved Oxygen 

### <5.0 mg/l Low PP=929/1171; VP=501/648 Impaired by the IWR threshold and nutrients were found to be the causative pollutant. TN (1.8 mg/L) exceeded the threshold of 1.6 mg/L. TP (0.35 mg/L) exceed the threshold of 0.22 mg/L. BOD (2.0 mg/L) did not exceed the threshold of 2.0 mg/L and had 22 observations. TN/TP median = 4.6, standard deviation 3.9, range 1.85 - 38.8, observations 356. A TMDL has been proposed by EPA, 9/30/2006.

09-2080 NHLMS Complex 3203A NUBBIN SLOUGH STREAM 3F Fecal Coliform Fecal Coliform 

### >400 colonies/100 mL Medium PP=2/10; VP=7/29

09-2081 NHLMS Complex 3203A NUBBIN SLOUGH STREAM 3F Nutrients Nutrients (Chlorophylla) 

### Median TN = 1.80 mg/L Low The average annual Chla value exceeded the IWR threshold of 20 ug/L in 2006 (21.68 ug/L). TP (0.35 mg/L) exceeded the threshold of 0.22 mg/L. Data indicate that the WBID is nitrogen limited (TN/TP median = 4.62, standard deviation of 3.96, range of 1.85 - 38.84, observations 356). A TMDL has been proposed by EPA, 9/30/2006.

09-2082 NHLMS Complex 3203B MOSQUITO CREEK STREAM 3F Dissolved Oxygen Dissolved Oxygen 

### <5.0 mg/l Low PP=505/657; VP=343/463 Impaired by the IWR threshold and nutrients are found to be the causative pollutant. TN (2.2 mg/L) exceeded the threshold of 1.6 mg/L. TP (0.6 mg/L) exceeded the threshold of

0.22 mg/L. BOD (2.0 mg/L) did not exceed the threshold of 2.0 mg/L and had 36 observations. TN/TP median = 4.6, standard deviation of 2.3, range of 2.01- 20.2, observations 233. A TMDL has already been proposed by EPA, 9/30/2006.

09-2083 NHLMS Complex 3203B MOSQUITO CREEK STREAM 3F Fecal Coliform Fecal Coliform 

### >400 colonies/100 mL Low PP=2/8; VP=19/33. A TMDL has already been established by EPA, 4/01/2004.

09-2084 NHLMS Complex 3213A LETTUCE CREEK STREAM 3F Dissolved Oxygen Dissolved Oxygen 

### <5.0 mg/l Low PP=168/222; VP=118/155 Impaired by the IWR threshold and nutrients are found to be the causative

pollutant. TN (1.9 mg/L) exceeded the threshold of 1.6 mg/L. TP (0.44 mg/L) exceeded the threshold of

0.22 mg/L. BOD (2.0 mg/L) did not exceed the threshold of 2.0 mg/L and had 22 observations. TN/TP median = 4.4, standard deviation 2.64, range 1.07 - 21.8, observations 181. A TMDL has already been re-proposed by EPA, 9/30/2006.

09-2085 NHLMS Complex 3213A LETTUCE CREEK STREAM 3F Nutrients Nutrients (Chlorophylla) 

### Median TN = 1.91 mg/L Low The annual average Chla value exceeded the IWR threshold of 20 ug/L in 2006 (21.32 ug/L). TP (0.44 mg/L) exceeded the threshold of 0.22 mg/L. Data indicate that the WBID is nitrogen limited (TN/TP median = 4.43, standard deviation 2.64, range, 1.07 - 21.8, observations 181). A TMDL has already been re-proposed by EPA, 9/30/2006.

## Lake Okeechobee Group 1 Basin/ Southeast District - Verified List (Cycle 1 Revised and Readopted May 2009) Hydrologic Unit: Lake Okeechobee

May 14, 2009 3 of 6 Florida Department of Environmental Protection OGC Case

Number Planning Unit WBID Water Segment Name Waterbody Type Waterbody Class1 

### 1998 303(d) Parameters of Concern Parameters Assessed Using the 2007 Impaired

Surface Waters Rule (IWR) Concentration Causing Impairment Priority for TMDL Development2 

### Comments3 

### (# Exceedances/# Samples) PP = Planning Period VP = Verified Period

09-2086 NHLMS Complex 3213B HENRY CREEK STREAM 3F Dissolved Oxygen Dissolved Oxygen 

### <5.0 mg/l Low PP=185/236; VP=91/110 Impaired by the IWR threshold and nutrients are found to be the causative

pollutant. TN (1.9 mg/L) exceeded the threshold of 1.6 mg/L. TP (0.46 mg/L) exceeded the threshold of

0.22 mg/L. BOD (2.0 mg/L) did not exceed the threshold of 2.0 mg/L and had 16 observations. TN/TP median = 3.8, standard deviation 3.2, range 1.03 - 23.1, observations 132. A TMDL has already been re-proposed by EPA, 9/30/2006.

09-2087 NHLMS Complex 3213B HENRY CREEK STREAM 3F Nutrients Nutrients (Chlorophylla) 

### Median TN = 1.93 mg/L Low The annual average Chla value exceeded the IWR threshold of 20 ug/L in 2006 (22.77 ug/L). TP (0.46 mg/L) exceeded the threshold of 0.22 mg/L. Data indicate that the WBID is nitrogen limited (TN/TP median = 3.79, standard deviation 3.19, range 1.03 - 23.14, observations 132). A TMDL has already been re-proposed by EPA, 9/30/2006.

09-2088 NHLMS Complex 3213C S-135 STREAM 3F Dissolved Oxygen Dissolved Oxygen 

### <5.0 mg/l Low PP=54/148; VP=46/125 Impaired by the IWR threshold and BOD was found to be the causative pollutant. BOD (2.1 mg/L) exceeded the threshold value of 2.0 mg/L. BOD (2.1 mg/L) exceeded the threshold of 2.0 mg/L and had 21 observations. TN/TP median = 15.6, standard deviation 16.6, range 4.8- 166.1, observations 124. A TMDL has already been re-proposed by EPA, 9/30/2006.

09-2089 NHLMS Complex 3213C S-135 STREAM 3F Nutrients Nutrients (Chlorophylla) 

### Median TN = 1.50 mg/L Median TP = 0.09 mg/L Low The annual average Chla value exceeded the IWR threshold of 20 ug/L in 2006 (33.01 ug/L). Data indicate that the WBID is colimted by nitrogen and

phosphorous. TN/TP median = 15.61, standard deviation 16.65, range 4.85 - 166.1, observations124). Impaired but a TMDL has already been reproposed by EPA, 9/30/2006.

09-2090 NHLMS Complex 3213D MYRTLE SLOUGH STREAM 3F Dissolved Oxygen Dissolved Oxygen 

### <5.0 mg/l Low PP = 180 / 206; VP = 81 / 99 Impaired by the IWR threshold and nutrients are found to be the causative

pollutant. TN (1.9 mg/L) exceeded the threshold of 1.6 mg/L. TP (0.7 mg/L) exceeded the threshold of 0.22mg/L. BOD (3.05 mg/L) exceeded the threshold of 2.0 mg/L and had 12 observations. TN/TP median

= 5.5, standard deviation 4.07, range 2.46 - 14.3,observations 14. A TMDL has already been reproposed by EPA, 9/30/2006.

## Lake Okeechobee Group 1 Basin/ Southeast District - Verified List (Cycle 1 Revised and Readopted May 2009) Hydrologic Unit: Lake Okeechobee

May 14, 2009 4 of 6 Florida Department of Environmental Protection OGC Case

Number Planning Unit WBID Water Segment Name Waterbody Type Waterbody Class1 

### 1998 303(d) Parameters of Concern Parameters Assessed Using the 2007 Impaired

Surface Waters Rule (IWR) Concentration Causing Impairment Priority for TMDL Development2 

### Comments3 

### (# Exceedances/# Samples) PP = Planning Period VP = Verified Period

09-2091 NHLMS Complex 3213D MYRTLE SLOUGH STREAM 3F Nutrients Nutrients (Chlorophylla) 

### Median TN = 1.96 mg/L Low The annual average Chla value exceeded the IWR threshold of 20 ug/L in 2006 (59.73 ug/L). TP (0.07 mg/L) exceeded the threshold of 0.22 mg/L. Data indicate that the WBID is nitrogen limited (TN/TP median = 5.45, standard deviation 4.07, range 2.46 - 14.36, observations 14). A TMDL has already been re-proposed by EPA, 9/30/2006.

09-2092 NHLMS Complex 3219 S-153 STREAM 3F Dissolved Oxygen 

### <5.0 mg/l Medium PP = 10 / 10; VP = 21 / 29 Impaired by the IWR threshold and nutrients are found to be the causative pollutant. TN (2.13 mg/L) exceeded the threshold of 1.6 mg/L. TP (0.3 mg/L) exceeded the threshold of 0.22mg/L. BOD (3.3 mg/L) exceeded the threshold of 2.0 mg/L and had 19 observations. TN/TP median = 7.84, standard deviation of 3.5, range, 2.16 - 16.3, observations 27. New listing from Cycle 2.

09-2093 NHLMS Complex 3219 S-153 STREAM 3F Nutrients (Chlorophylla) 

### Median TN = 2.13 mg/L Medium The annual average Chla value exceeded the IWR threshold of 20 ug/L in 2006 (67.31 ug/L). TP (0.03 mg/L) exceeded the threshold of 0.22 mg/L. Data indicate that the WBID is nitrogen limited (TN/TP median = 7.84, standard deviation of 3.49, range, 2.16 - 16.28, observations 27). New listing from Cycle 2.

09-2094 TOL Complex 3203C L63 CANAL STREAM 3F Specific Conductance 

### Shall not be increased above 1275 umhos/cm Medium PP=3/214; VP=18/117. New listing from Cycle 2.

09-2095 TOL Complex 3203C L63 CANAL STREAM 3F Dissolved Oxygen 

### <5.0 mg/l Medium PP=11/13; VP=32/51 Impaired by the IWR threshold and nutrients were found to be the causative pollutant. The annual average chla value exceeded the threshold in 2006 (23.9 ug/L). BOD (2.0

mg/L) did not exceed the threshold of 2.0 mg/L and had 35 observations. TN/TP median = 68.8, standard

deviation of 66.9, range 2.4 - 225.7, observations 122. New listing from Cycle 2.

## Lake Okeechobee Group 1 Basin/ Southeast District - Verified List (Cycle 1 Revised and Readopted May 2009) Hydrologic Unit: Lake Okeechobee

May 14, 2009 5 of 6 Florida Department of Environmental Protection OGC Case

Number Planning Unit WBID Water Segment Name Waterbody Type Waterbody Class1 

### 1998 303(d) Parameters of Concern Parameters Assessed Using the 2007 Impaired

Surface Waters Rule (IWR) Concentration Causing Impairment Priority for TMDL Development2 

### Comments3 

### (# Exceedances/# Samples) PP = Planning Period VP = Verified Period

09-2096 TOL Complex 3203C L63 CANAL STREAM 3F Nutrients (Chlorophylla) 

### Median TP = 0.01 mg/L Medium The annual average Chla value exceeded the threshold of 20.0 ug/L in 2006 (23.92 ug/L). TN (0.67 mg/L) did not exceed the threshold of 1.6 mg/L. Data indicate that the WBID is phosphorous limited. TN/TP median = 68.75, standard deviation of 66.96, range

2.42 - 225.7, observations 122. New listing from

Cycle 2. Nutrient concentrations are very low. Therefore, elevated chlorophyll may be due to standing water behind the flow-way to the lake.

09-2097 TOL Complex 3205 TAYLOR CREEK STREAM 3F Dissolved Oxygen Dissolved Oxygen 

### <5.0 mg/l Low PP=370/578; VP=402/686 Impaired by the IWR threshold and nutrients were found to be the causative pollutant. TN (1.8 mg/L) exceeded the threshold of 1.6 mg/L. TP (0.37 mg/L) exceeded the threshold of 0.22 mg/L. BOD (3.6 mg/L) exceeded the threshold of 2.0 mg/L and had 34 observations. TN/TP median = 4.6, standard deviation of 3.4, range

1.8 - 36.2, observations 514. A TMDL has already been proposed by EPA, 9/30/2006.

09-2098 TOL Complex 3205 TAYLOR CREEK STREAM 3F Fecal Coliform 

### >400 colonies/100 mL Low PP=5/16; VP=24/48. New listing from Cycle 2.

09-2099 TOL Complex 3205 TAYLOR CREEK STREAM 3F Nutrients Nutrients (Chlorophylla) 

### Median TN = 1.84 mg/L Low The annual average Chla value exceeded the IWR threshold value of 20 ug/L in 2006 (34.66 ug/L). TP (0.37 mg/L) exceeded the threshold of 0.22 mg/L. Data indicate that the WBID is nitrogen limited (TN/TP median = 4.67, standard deviation of 3.40, range 1.81

- 36.25, observations 514). A TMDL has already been proposed by EPA, 9/30/2006.

09-2100 TOL Complex 3205D OTTER CREEK STREAM 3F Dissolved Oxygen Dissolved Oxygen 

### <5.0 mg/l Low PP=457/574; VP=402/503 Impaired by the IWR threshold and nutrients were found to be the causative pollutant. TN (1.9 mg/L) exceeded the threshold of 1.6 mg/L. TP (0.54mg/L) exceeded the

threshold of 0.22. BOD (2.0 mg/L) exceeded the threshold of 2.0 mg/L and had 51 observations. TN/TP median = 4.1, standard deviation of 8.02, range of 0.66 - 138.7, observations 412. A TMDL has been proposed by EPA, 9/30/2006.

09-2010 TOL Complex 3205D OTTER CREEK STREAM 3F Fecal Coliform 

### >400 colonies/100 mL Low PP=No data; VP=11/27. New listing from Cycle 2.

1Florida's waterbody classifications are defined as: 1 - Potable water supplies, 2- Shellfish propagation or harvesting, 3F- Recreation, propagation, and maintenance of a healthy, well-balanced in fresh water, 3M- Recreation, propagation, and maintenance of a healthy, well-balanced population of fish and wildlife in marine water, 4- Agricultural water supplies, population of fish and wildlife, 5- Navigation, utility, and industrial use.

Where a parameter was only identified as impaired under the IWR, a priority of “medium” was assigned. Exceptions are waters where the impairment poses a threat to potable water or human health, which have been assigned a “high” priority, and fecal coliform impairments, which have been assigned a “low” priority. All other listings as of this cycle are prioritized based on the following: it is the Department's intent that listings with a "High" priority be addressed within the next 5 years, listings with a "Medium" priority be addressed within 5-10 years as resources allow, *A statewide TMDL for mercury, that will address this waterbody, is scheduled to be completed in 2012.

2Where a parameter was 1998 303(d) listed, the priority for TMDL development is the year provided and is assigned based on the consent decree schedule.

## Lake Okeechobee Group 1 Basin/ Southeast District - Verified List (Cycle 1 Revised and Readopted May 2009) Hydrologic Unit: Lake Okeechobee

May 14, 2009 6 of 6 Florida Department of Environmental Protection OGC Case

Number Planning Unit WBID Water Segment Name Waterbody Type Waterbody Class1 

### 1998 303(d) Parameters of Concern Parameters Assessed Using the 2007 Impaired

Surface Waters Rule (IWR) Concentration Causing Impairment Priority for TMDL Development2 

### Comments3 

### (# Exceedances/# Samples) PP = Planning Period VP = Verified Period

and listings with a "Low" priority be addressed within the next 10 years.

3 PP - Planning Period (January 1, 1994 through December 31, 2003); VP - Verified Period (January 1, 1999 through June 30, 2006)

The Verified list was created using Run 31 of the IWR Analysis.