## Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009 Hydrologic Unit: Ocklawaha River

May 15, 2009 1 of 8 Florida Department of Environmental Protection OGC Case

NumberPlanning Unit WBID Water Segment NameWaterbody Type Waterbody Class1 1998 303(d) Parameters of Concern Parameters Assessed Using the

Impaired Waters Rule (IWR) pp = 29/30 Potentially

Impaired; vp = 34/37 Impaired. Concentration Causing Impairment Priority for TMDL Development2 Comments (# of Exceedances/ # of Samples) pp=Planning Period vp=Verified Period3

09-1999 Lake Apopka 2873C JOHNS LAKE LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Largemouth Bass. 12 Largemouth Bass samples, Hg mean concentration was 0.50 mg/Kg in 2003.

09-2000 Lake Apopka 2873C JOHNS LAKE LAKE 3F Nutrients (TSI) TP = 0.03 mg/L Medium pp = Potentially Impaired. 1 TSI annual mean exceeded the threshold. 5 TSI annual means increased by more than 10 units over historical value (35.71 calculated based on TSI data from 1988 through 1992). Annual means were 47.7 (1995), 51.6 (1996), 55.6 (1997), 45.1 (1998), 56.1 (1999), 60.8 (2000), 56.1 (2003), and 56.4 (2004). vp = Impaired. 2 TSI annual means exceeded the threshold. 1 TSI annual mean increased by more than 10 units over historical value (35.71 calculated based on TSI data from 1988 through 1992). Annual means were 60.8 (2000) and 45.0 (2006). In 2006, color annual mean was <40. Therefore, assessment threshold used was TSI 40. 18 Chla values, range 1 - 18 ug/L, median 9.55 ug/L. 39 Chla (corrected) values, range 1 - 42.0 ug/L, median 8.54 ug/L. 54 TN values, range 0.004 - 2.62 ug/L,

median 0.865 mg/L. 55 TP values, range 0.002 - 0.29 mg/L, median 0.03 mg/L. Limited by phosphorus based on a median TN/TP ratio of 31.64 (52 values) in the verified period.

09-2001 Lake Griffin Unit 2740F OCKLAWAHA RIVER/SUNNYHILL STREAM 3F Dissolved OxygenDissolved Oxygen < 5.0 mg/L Medium pp = 84 / 125 Potentially Impaired; vp = 38 / 79 Impaired. DO met the verification threshold and TN and BOD were identified as the causative pollutants. 49 TN measurements, median 3.16 mg/L. 74 TP measurements, median 0.05 mg/L. 16 BOD measurements, median 3.95 mg/L. The FDEP has drafted a TMDL report, which is now pending.

09-2002 Lake Griffin Unit 2740F OCKLAWAHA RIVER/SUNNYHILL STREAM 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Largemouth Bass. 24 Largemouth Bass samples, Hg mean concentration was 0.44 mg/Kg in 2003.

09-2003 Lake Griffin Unit 2740F OCKLAWAHA RIVER/SUNNYHILL STREAM 3F Nutrients Nutrients (Chlorophyll-a) TP = 0.05 mg/L Medium pp = 3 Chla annual means exceeded 20 ug/L Annual mean chla in three consecutive years(1998, 1999, and 2000) exceeded the historic minimum (9.75 ug/L calculated based on data from 1994 - 1998) by more than 50%. Impaired. Annual means were 4.54 ug/L (1995), 19.02 ug/L (1996), 5.69 ug/L (1997), 61.65 ug/L (1999), 40.3 ug/L (2000), and

35.52 ug/L (2001). 86 Chla values, range 1.02 - 236.42 ug/L, mean 37.75 ug/L. 96 Chla (corrected) values, range 1.0 - 226.28 ug/L, mean 33.84 ug/L. vp = 2 Chla annual means exceeded 20 ug/L. Annual mean Chla in two consecutive years(2000 and 2001) exceeded the historic minimum (9.75 ug/L calculated based on data from 1994 - 1998) by more than 50%. Impaired. Annual means were 40.3 ug/L (2000) and 35.52 ug/L (2001). 63 Chla values, range 1.42 - 119.9 ug/L, mean 47.63 ug/L. 74 Chla (corrected) values, range 1.0 - 111.83 ug/L, mean

39.21 ug/L. 49 TN values, median 3.16 mg/L. 74 TP values, median

0.05 mg/L. The median value of 49 TN/TP ratio is 61, suggesting phosphorus is the limiting nutrient. The FDEP has drafted a TMDL, which is now pending.

09-2004 Lake Griffin Unit 2797A ELLA LAKE LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Largemouth Bass. 12 Largemouth Bass samples, Hg mean concentration was 0.81 mg/Kg in 2005.

09-2005 Lake Griffin Unit 2803A HOLLY LAKE LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Largemouth Bass. 12 Largemouth Bass samples, Hg mean concentration was 0.81 mg/Kg in 2005.

09-2006 Lake Griffin Unit 2809 NONCONTRIBUTING AREA STREAM 3F Nutrients Nutrients (Chlorophyll-a) N/A Medium pp = One Chla annual mean value exceeded 20 ug/L. Annual mean was 76.7 ug/L (1995). 2 Chla values, range 108.03 - 190.58 ug/L, mean

149.31 ug/L. 14 Chla (corrected) values, range 8.0 - 208.5 ug/L, mean 105.42 ug/L. vp = No data. EPA believed that a nutrient TMDL was not needed. Assessment based on Period of Record data.

09-2007 Lake Griffin Unit 2817A HAYNES CREEK REACH STREAM 3F Coliforms Fecal Coliform > 400 per 100 mL Low pp = 8 / 37 Potentially Impaired; vp = 6 / 31, Impaired. EPA established a fecal coliform TMDL on March 31, 2004

## Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009 Hydrologic Unit: Ocklawaha River

May 15, 2009 2 of 8 Florida Department of Environmental Protection OGC Case

NumberPlanning Unit WBID Water Segment NameWaterbody Type Waterbody Class1 1998 303(d) Parameters of Concern Parameters Assessed Using the

Impaired Waters Rule (IWR) pp = 29/30 Potentially

Impaired; vp = 34/37 Impaired. Concentration Causing Impairment Priority for TMDL Development2 Comments (# of Exceedances/ # of Samples) pp=Planning Period vp=Verified Period3

09-2008 Lake Griffin Unit 2825A SILVER LAKE LAKE 3F Nutrients (TSI) TP = 0.03 mg/L Medium pp = Potentially Impaired. 3 TSI annual means exceeded the threshold. Annual means were 48.6 (2001), 47.6 (2002), 39.8 (2003), and 52.9

(2004). From 2001 to 2004, color annual means were <40. vp = Impaired. 3 TSI annual means exceeded the threshold. Annual means were 48.6 (2001), 47.6 (2002), and 52.9 (2004). In 2001, 2002 and 2004, color annual means were <40. 55 Chla (corrected) values, range 1 - 25.4 ug/L, median 4.27 ug/L. 60 TN values, range 0.9 - 5.804 mg/L, median 1.69 mg/L. 64 TP values, range 0.01 - 7.46 mg/L, median 0.03

mg/L. Limited by phosphorus based on a median TN/TP ratio of 57.0 (57 values) in the verified period.

09-2009Lake Harris Unit 2817B LAKE EUSTIS LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 45 / 213 Potentially Impaired; vp = 35 / 162 Impaired. DO met the verification threshold and TN and BOD were identified as the causative pollutants. 156 TN measurements, median 2.20 mg/L. 159 TP measurements, median 0.04 mg/L. 10 BOD measurements, median 3.2 mg/L.

09-2010Lake Harris Unit 2819A (2819 on the Consent Decree List) TROUT LAKE LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 2 / 9 insufficient data; vp = 8 / 23 Impaired. DO met the verification threshold and TN and TP were identified as the causative pollutants. 46 TN measurements, median 2.44 mg/L. 40 TP measurements, median 0.24 mg/L. No BOD measurements.

09-2011Lake Harris Unit 2821B LAKE JOANNA LAKE 3F Nutrients (Historic TSI) TN = 0.69 mg/L TP = 0.04 mg/L Medium pp = Potentially Impaired. 3 TSI annual means increased by more than 10 units over historical value (20.63 calculated based on TSI data from 1993 through 1997). Annual means were 21.7 (1995), 25.2 (1998), 26.6 (1999), 27.2 (2000), 37.5 (2001), 34.7 (2002), 33.6 (2003), and 25.6 (2004). vp = Impaired. 3 TSI annual means increased by more than 10 units over historical value. Annual means were 37.5 (2001), 34.7 (2002), and 33.6 (2003). 45 TN values, median 0.69 mg/L, 47TP values, median 0.04 mg/L. The median value of 39 TN/TP ratios is about 16, suggesting phosphorus and nitrogen co-limiting.

09-2012Lake Harris Unit 2831A DORA CANAL STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 32 / 81 Potentially Impaired; vp = 46 / 104 Impaired. DO met the verification threshold and TN was identified as the causative pollutant.

136 TN measurements, median 3.37 mg/L. 139 TP measurements, median 0.06 mg/L. No BOD measurements.

09-2013Lake Harris Unit 2832A LAKE DENHAM LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 57 / 177 Potentially Impaired; vp = 48 / 132 Impaired. DO met the verification threshold and TN and BOD were identified as the causative pollutants. 128 TN measurements, median 2.83 mg/L. 16 BOD measurements, median 11.05 mg/L. 133 TP measurements, median 0.1 mg/L.

09-2014Lake Harris Unit 2832A LAKE DENHAM LAKE 3F Nutrients (TSI) TN = 2.82 mg/L TP = 0.10 mg/L Medium pp = Potentially Impaired. 7 TSI annual means exceeded the threshold. Annual means were 72.5 (1998), 80.1 (1999), 77.8 (2000), 75.1 (2001), 75.8 (2002), 74.3 (2003), and 69.8 (2004). In 2000, color annual means were <40. vp = Impaired. 7 TSI annual means exceeded the threshold. Annual means were 77.8 (2000), 75.1 (2001), 75.8 (2002), 74.3 (2003), and 69.8 (2004). 104 Chla values, range 1 - 466.6 ug/L, median 62.57 ug/L. 120 Chla (corrected) values, range 1 - 457.77 ug/L, median 65.85. 125 TN values, range 1.53 - 6.35 mg/L, median 2.817 mg/L. 130 TP values, range 0.052 - 0.28 mg/L, median 0.098 mg/L. Co-limited by nitrogen and phosphorus based on a median TN/TP ratio of 29.96 (125 values) in the verified period.

09-2015Lake Harris Unit 2838G LAKE HARRIS OUTLET STREAM 3F Nutrients (Chlorophyll-a) TP = 0.05 mg/L Medium pp = 3 Chla annual means exceeded 20 ug/L, Potentially Impaired. Annual means were 42.98 ug/L (2001), 39.18 ug/L (2002), and 28.4 ug/L (2003). 36 Chla (corrected) values, range 10.4 - 61.4 ug/L, mean

34.32 ug/L. vp = 3 Chla annual means exceeded 20 ug/L, Impaired. Annual means were 42.98 ug/L (2001), 39.18 ug/L (2002), and 28.4 ug/L (2003). 36 Chla (corrected) values, range 10.4 - 61.4 ug/L, mean

32.32 ug/L. 32 TN values, median 1.94 mg/L. 32 TP values, median

0.05 mg/L. The median value of 27 TN/TP ratio is 36, suggesting phosphorus is the limiting nutrient.

## Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009 Hydrologic Unit: Ocklawaha River

May 15, 2009 3 of 8 Florida Department of Environmental Protection OGC Case

NumberPlanning Unit WBID Water Segment NameWaterbody Type Waterbody Class1 1998 303(d) Parameters of Concern Parameters Assessed Using the

Impaired Waters Rule (IWR) pp = 29/30 Potentially

Impaired; vp = 34/37 Impaired. Concentration Causing Impairment Priority for TMDL Development2 Comments (# of Exceedances/ # of Samples) pp=Planning Period vp=Verified Period3

09-2016 Marshall Swamp Unit 2740D OCKLAWAHA RIVER ABOVE DAISY STREAM 3F Dissolved OxygenDissolved Oxygen < 5.0 mg/L Medium pp = 163 / 264 Potentially Impaired; vp = 83 / 140 Impaired. DO met the verification threshold and TN and BOD were identified as the causative pollutants. 130 TN measurements, median 2.52 mg/L. 131 TP measurements, median 0.06 mg/L. 15 BOD measurements, median 3.2 mg/L. The FDEP has drafted a TMDL, which is now pending.

09-2017 Marshall Swamp Unit 2740D OCKLAWAHA RIVER ABOVE DAISY STREAM 3F Mercury (Based on Fish Consumption Advisory) Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Largemouth Bass. 24 Largemouth Bass samples, Hg mean concentration was 0.44 mg/Kg in 2003.

09-2019 Marshall Swamp Unit 2740D OCKLAWAHA RIVER ABOVE DAISY STREAM 3F Nutrients Nutrients (Chlorophyll-a) TP = 0.06 mg/L Medium pp = 8 Chla annual means exceeded 20 ug/L. Annual mean chla in two consecutive years(2000 and 2001) exceeded the historic minimum (18.93 ug/L calculated based on data from 1975 - 1979) by more than

50%, Potentially Impaired. Annual means were 40.14 ug/L (1995), 24.11 ug/L (1996), 37.44 ug/L (1997), 38.59 ug/L (2000), 38.37 ug/L (2001), 15.65 ug/L (2002), 22.13 ug/L (2003), 20.53 ug/L (2004). 192 Chla (corrected) values, range 1.0 - 268.19 ug/L, mean 33.61 ug/L. vp = 6 chla annual means exceeded 20 ug/L. Annual means were 38.59 ug/L (2000), 38.37 ug/L (2001), 15.65 ug/L (2002), 22.13 ug/L (2003), 20.40 ug/L (2004), 52.78 ug/L (2005), and 41.36 ug/L (2006). 111 Chla

(corrected) values, range 1.0 - 121.4 ug/L, mean 34.36 ug/L. 130 TN values, median 2.52 mg/L. 131 TP values, median 0.057 mg/L. The median value of 130 TN/TP ratio is about 41, phosphorus is the limiting nutrient. The FDEP has drafted a TMDL, which is now pending.

09-2020 Marshall Swamp Unit 2785A SMITH LAKE LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* A limited consumption advisory was issued by the DOH. The mercury impairment was verified based on results from 8 fishes in the verified

period . The mean Hg concentration in fish tissue was 0.89 mg/kg.

09-2021 Marshall Swamp Unit 2790A LAKE WEIR LAKE 3F Nutrients (TSI) TP = 0.01 mg/L Medium pp = Potentially Impaired. 1 TSI annual mean exceeded the threshold. Annual means were 39.0 (1995), 37.4 (1996), 39.0 (1997), 41.8 (1998),

31.5 (1999), 31.4 (2000), 32.3 (2001), 31.4 (2002), 27.4 (2003), and 31.1 (2004). In 1998 the annual mean color was <40. vp = Impaired. 2

TSI annual means exceeded the threshold. Annual means were 31.4 (2000), 32.3 (2001), 31.4 (2002), 27.4 (2003), 31.1 (2004), 41.4 (2005),

and 44.9 (2006). In 2005 and 2006, the annual means of color were <40. 26 Chla values, range 7.19 - 14.22 ug/L, median 10.62 ug/L. 91 Chla (corrected) values, range 1 - 13.83 ug/L, median 1 ug/L. 95 TN values, range 0.604 - 1.704 mg/L, median 0.824 mg/L. 94 TP values, range 0.004 - 0.023 mg/L, median 0.0138 mg/L. Limited by phosphorus based on a median TN/TP ratio of 63.85 (95 values) in the verified period.

09-2022 Orange Creek 2688 HATCHET CREEK STREAM 3F Coliforms Fecal Coliform > 400 per 100 mL Low pp = 16 / 73 Potentially Impaired; vp = 17 / 74, Impaired. Delisted from the Consent Decree List in the 1st cycle, assessment but re-listed in the 2nd assessment cycle.

09-2023 Orange Creek 2688 HATCHET CREEK STREAM 3F Nutrients Nutrients (Historic Chlorophyll-a) TN > 1.43 mg/L TP > 0.16 mg/L Medium pp = Annual mean chla in three consecutive years(2000, 2001, and 2002) exceeded the historic minimum (3.69 ug/L calculated based on data from 1994 - 1998) by more than 50%. Potentially Impaired. Annual

means were 1.03 ug/L (1996), 5.17 ug/L (1997), 3.90 ug/L (1998), 9.71 ug/L (1999), 11.71 ug/L (2000), 8.25 ug/L (2001), and 7.39 ug/L (2002). 119 Chla values, range 1.0 - 56.7 ug/L, mean 9.98 ug/L. 122 Chla (corrected) values, range 1.0 - 46.22 ug/L, mean 7.86 ug/L. vp = Annual mean chla in three consecutive years(2000, 2001, and 2002) exceeded the historic minimum by more than 50%. Impaired. Annual means were 11.71 ug/L (2000), 8.25 ug/L (2001), and 7.39 ug/L (2002). 85 Chla values, range 1.0 - 56.7 ug/L, mean 11.4 ug/L. 88 Chla (corrected) values, range 1.0 - 46.22 ug/L, mean 9.39 ug/L. 107 TN values, median 1.43 mg/L. 113 TP values, median 0.16 mg/L. The median value of 127 TN/TP ratio is about 10, suggesting phosphorus and nitrogen co-limiting.

Delisted during the 1st cycle assessment based on Chla concentration. Now re-listed based on historic chla concentration.

09-2024Orange Creek 2695 LITTLE HATCHET CREEK STREAM 3F Fecal Coliform > 400 per 100 mL Low pp = 31 / 72, Potentially Impaired; vp = 38 / 83 Impaired

## Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009 Hydrologic Unit: Ocklawaha River

May 15, 2009 4 of 8 Florida Department of Environmental Protection OGC Case

NumberPlanning Unit WBID Water Segment NameWaterbody Type Waterbody Class1 1998 303(d) Parameters of Concern Parameters Assessed Using the

Impaired Waters Rule (IWR) pp = 29/30 Potentially

Impaired; vp = 34/37 Impaired. Concentration Causing Impairment Priority for TMDL Development2 Comments (# of Exceedances/ # of Samples) pp=Planning Period vp=Verified Period3

09-2025 Orange Creek 2696 POSSUM CREEK STREAM 3F Fecal Coliform > 400 per 100 mL Low pp = 65 / 80 Potentially Impaired; vp = 71 / 93 Impaired

09-2026 Orange Creek 2705A PRAIRIE CREEK STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 10 / 71 Potentially Impaired; vp = 25 / 52 Impaired. DO met the verification threshold and TN was identified as the causative pollutant. 48 TN measurements, median 2.31 mg/L. 448 TP measurements, median 0.13 mg/L. No BOD measurements.

09-2027Orange Creek 2705B (2705 on the Consent Decree List) NEWNANS LAKE LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 22 / 314 not Impaired; vp = 25 / 172 Impaired. DO met the verification threshold and TN and TP were identified as the causative pollutants. 205 TN measurements, median 4.149 mg/L. 211 TP

measurements, median 0.238 mg/L, No BOD measurements.

09-2028 Orange Creek 2713 LITTLE ORANGE CREEK STREAM 3F Fecal Coliform > 400 per 100 mL Low pp = 4 / 7 Potentially Impaired; vp = 10 / 20, Impaired.

09-2029 Orange Creek 2713B REDWATER LAKE LAKE 3F Nutrients (TSI) TN = 1.15 mg/L TP = 0.05 mg/L Medium pp = Not Impaired. 1 TSI annual mean (1995) exceeded the threshold. However, in the next 3 consecutive years, annual means did not exceed the threshold. Annual means were 66.0 (1995), 57.5 (1996), 59.3 (1997), and 57.0 (1998). vp = no data. The waterbody was verified for nutrient impairment in the 1st cycle assessment. The median value of 5 TN/TP ratio is about 23, suggesting phosphorus and nitrogen co-limiting. The not Impaired assessment call for the planning period was made mainly on LakeWatch data. Therefore, the water is still considered Impaired.

09-2030 Orange Creek 2718 BEVENS ARM OUTLET STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 0 / 2 insufficient data; vp = 10 / 14 Impaired. DO met the verification threshold and TN and TP were identified as the causative pollutants. 16 TN measurements, median 2.21 mg/L. 16 TP measurements, median 0.34 mg/L. No BOD measurements.

09-2031 Orange Creek 2718B BEVENS ARM LAKE 3F Nutrients (TSI) TN = 2.68 mg/L TP = 0.25 mg/L Medium pp = Potentially Impaired. 9 TSI annual means exceeded the threshold. No TSI annual means increased by more than 10 units over historical value (72.35 calculated based on TSI data from 1994 through 1998). Annual means were 72.8 (1995), 66.6 (1996), 70.0 (1998), 68.2 (1999), 81.6 (2000), 78.8 (2001), 71.4 (2002), 79.5 (2003), and 80.3 (2004). vp

= Impaired. 5 TSI annual means exceeded the threshold. TSI annual means increased by more than 10 units over historical value in 4 years. Annual means were 81.6 (2000), 78.8 (2001), 71.4 (2002), 79.5 (2003), and 72.9 (2004). 52 chla values, range 2.30 - 428.35 ug/L, median 84.9

ug/L. 54 chla (corrected) values, range 1 - 466.6 ug/L, median 87.41. 65 TN values, range 0.2 - 6.107 mg/L, median 2.68 mg/L. 72 TP values,

range 0.1 - 0.53 mg/L, median 0.25 mg/L. Co-limited by nitrogen and phosphorus based on a median TN/TP ratio of 12.31 (65 values) in the verified period.

09-2032 Orange Creek 2718B BEVENS ARM LAKE 3F Turbidity >29 NTUs above background Medium pp = 31 / 96, Potentially Impaired; vp = 40 / 84 Impaired

09-2033 Orange Creek 2720 ALACHUA SINK OUTLET STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 2 / 2 insufficient data ; vp = 9 / 9 Impaired. DO met the verification threshold and TN was identified as the causative pollutant. 15 TN measurements, median 2.00 mg/L. 14 TP measurements, median 0.10 mg/L. 1 BOD measurement, 2.6 mg/L.

09-2034Orange Creek 2720 ALACHUA SINK OUTLET STREAM 3F Fecal Coliform > 400 per 100 mL Low pp = 3 / 9, Potentially Impaired; vp = 5 / 18 Impaired

09-2035 Orange Creek 2720A (2720 on the Consent Decree List) ALACHUA SINK LAKE 3F Fecal Coliform > 400 per 100 mL Low pp = 8 / 26 Potentially Impaired; vp = 8 / 27 Impaired.

09-2036 Orange Creek 2723A COWPEN LAKE LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Bluegill. 12 Bluegill samples, Hg mean concentration was 0.45 mg/Kg in 2003.

09-2037Orange Creek 2733 CAMPS CANAL REACH STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 12 / 14 Potentially Impaired ; vp = 38 / 44 Impaired. DO met the verification threshold and TN was identified as the causative pollutant. 44 TN measurements, median 1.99 mg/L. 44 TP measurements, median 0.12 mg/L. No BOD measurements.

## Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009 Hydrologic Unit: Ocklawaha River

May 15, 2009 5 of 8 Florida Department of Environmental Protection OGC Case

NumberPlanning Unit WBID Water Segment NameWaterbody Type Waterbody Class1 1998 303(d) Parameters of Concern Parameters Assessed Using the

Impaired Waters Rule (IWR) pp = 29/30 Potentially

Impaired; vp = 34/37 Impaired. Concentration Causing Impairment Priority for TMDL Development2 Comments (# of Exceedances/ # of Samples) pp=Planning Period vp=Verified Period3

09-2038 Orange Creek 2738 LOCHLOOSA LAKE OUTLET STREAM 3F Nutrients Nutrients (Chlorophyll-a) N/A Medium pp = Four Chla annual mean values exceeded 20 ug/L. Annual means were 64.93 ug/L (1996), 50.58 ug/L (1997) 94.67 ug/L (1998), and 115.8

ug/L (1999). 13 Chla values, range 18.30 - 152.66 ug/L, mean 64.88 ug/L. 32 Chla (corrected) values, range 1.0 - 227.5 ug/L, mean 73.88

ug/L. vp = Insufficient data to calculate any annual mean. 8 Chla (corrected) values, range 1.0 - 227.5 ug/L, mean 60.14 ug/L. 78 TN values, median 1.24 mg/L. 79 TP values, median 0.08 mg/L. Assessment based on Period of Record data.

09-2039 Orange Creek 2738A (2738 on the Consent Decree List)LOCHLOOSA LAKE LAKE 3F Nutrients Nutrients (TSI) TN = 1.72 mg/L TP = 0.09 mg/L Medium pp = Potentially Impaired. 8 TSI annual means exceeded the threshold. 7 TSI annual means increased by more than 10 units over historical value (54.2 calculated based on TSI data from 1986 through 1990). Annual means were 64.6 (1995), 65.9 (1996), 69.2 (1997), 76.9 (1998), 84.7 (1999), 88.5 (2000), 84.4 (2001), 56.4 (2003), and 61.1 (2004). vp = Impaired. 4 TSI annual means exceeded the threshold. 3 TSI annual

means increased by more than 10 units over historical value. Annual means were 88.5 (2000), 84.4 (2001), 56.4 (2003), 61.1 (2004), 56.6

(2005), and 64.6 (2006). 102 chla values, range 1 - 207.12 ug/L, median 24.05 ug/L. 114 chla (corrected) values, range 1 - 285.2 ug/L,

median 22.04 ug/L. 136 TN values, range 1.11 - 7.57 mg/L, median 1.72 mg/L. 138 TP values, range 0.029 - 0.203 mg/L, median 0.087 mg/L. Co-limited by nitrogen and phosphorus based on a median TN/TP ratio of 29.57 (135 values) in the verified period. The FDEP has drafted a TMDL, which is now pending.

09-2040 Orange Creek 2744 RIVER STYX REACH STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 27 / 28 Potentially Impaired; vp = 54 / 54 Impaired. DO met the verification threshold and TN, TP, and BOD were identified as the causative pollutants. 55 TN measurements, median 2.10 mg/L. 55 TP

measurements, median 0.27 mg/L. 10 BOD measurements, median 2.15 mg/L.

09-2041 Orange Creek 2747 ORANGE CREEK STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 37 / 173 Potentially Impaired; vp = 87 / 160 Impaired. DO met the verification threshold and TN was identified as the causative pollutant.

141 TN measurements, median 2.02 mg/L. 143 TP measurements, median 0.16 mg/L. 6 BOD measurements, median 0.6 mg/L.

09-2042 Orange Creek 2749 ORANGE LAKE REACH LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 3 / 10 Potentially Impaired; vp = 19 / 23 Impaired. DO met the verification threshold and TP was identified as the causative pollutant. 20 TP measurements, median 0.19 mg/L 20 TN measurements, median 1.57 mg/L. 10 BOD measurements, median 0.7 mg/L,

09-2043 Orange Creek 2749A (2749 on the Consent Decree List) ORANGE LAKE LAKE 3F Dissolved OxygenDissolved Oxygen < 5.0 mg/L Medium pp = 76 / 263 Potentially Impaired; vp = 48 / 167 Impaired. DO met the verification threshold and TN and TP were identified as the causative pollutants. 160 TN measurements, median 1.89 mg/L. 164 TP measurements, median 0.15 mg/L. No BOD measurements. Delisted from the Consent Decree list in the 1st assessment cycle but re-listed in the 2nd cycle.

09-2044Orange Creek 2754 CROSS CREEK STREAM 3F Dissolved OxygenDissolved Oxygen < 5.0 mg/L Medium pp = 35 / 56 Potentially Impaired; vp = 22 / 45 Impaired. DO met the verification threshold, but unable to determine the causative pollutants. 44 TN values, median 1.52 mg/L. 44 TP values, median 0.11 mg/L. No BOD observations. The FDEP has drafted a TMDL, which is now pending.

09-2045 Orange Creek 2754 CROSS CREEK STREAM 3F Nutrients Nutrients (Chlorophyll-a) TN = 1.52 mg/L TP = 0.10 mg/L Medium pp = 3 Chla annual mean values exceeded 20 ug/L, Potentially Impaired. Annual means were 25.61 ug/L (1995), 27.57 ug/L (1996), and 35.35 ug/L (1997). 37 Chla values, range 12.84 - 88.17 ug/L, mean 37.61 ug/L. 36 Chla (corrected) values, range 10.96 - 86.87 ug/L, mean 32.45 ug/L. vp = No data. 40 TN values, median 1.52 mg/L. 40 TP values, median 0.1 mg/L. The median value of 45 TN/TP ratio is about

14, suggesting phosphorus and nitrogen are colimiting nutrients. The FDEP has drafted a TMDL, which is now pending.

## Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009 Hydrologic Unit: Ocklawaha River

May 15, 2009 6 of 8 Florida Department of Environmental Protection OGC Case

NumberPlanning Unit WBID Water Segment NameWaterbody Type Waterbody Class1 1998 303(d) Parameters of Concern Parameters Assessed Using the

Impaired Waters Rule (IWR) pp = 29/30 Potentially

Impaired; vp = 34/37 Impaired. Concentration Causing Impairment Priority for TMDL Development2 Comments (# of Exceedances/ # of Samples) pp=Planning Period vp=Verified Period3

09-2046 Palatlakaha River 1406 BIG CREEK REACH STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 19 / 31 Potentially Impaired; vp = 24 / 25 Impaired. DO met the verification threshold and TN was identified as the causative pollutant. 11 TN measurements, median 2.04 mg/L. 15 TP measurements, median 0.05 mg/L, 11 BOD measurements, median 0.8 mg/L.

09-2047 Palatlakaha River 2839A LAKE MINNEOLA LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Largemouth Bass. 13 Largemouth Bass

samples, Hg mean concentration was 0.57 mg/Kg in 2000-2003.

09-2048 Palatlakaha River 2839D LAKE CHERRY LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Largemouth Bass. 12 Largemouth Bass samples, Hg mean concentration was 0.55 mg/Kg in 2002.

09-2049 Palatlakaha River 2839D LAKE CHERRY LAKE 3F Nutrients (Historic TSI) TP = 0.02 mg/L Medium pp = Potentially Impaired. 1 TSI annual mean increased by more than 10 units over historical value (30.92 calculated based on TSI data from 1988 through 1992). Annual means were 29.4 (1995), 34.7 (1996), 33.6 (1998), 33.1 (1999), 32.9 (2000), 33.4 (2001), 30.9 (2002), 41.1 (2003), and 37.7 (2004). vp = Impaired. 3 TSI annual means increased by more than 10 units over historical value. Annual means were 32.9 (2000), 33.4 (2001), 30.9 (2002), 41.1 (2003), 37.7 (2004), 44.1 (2005),

and 44.9 (2006). 93 TN values, median 0.904 mg/L. 94 TP values, median 0.022 mg/L. The median value of 92 TN/TP ratios is about 44, suggesting phosphorus is the limiting nutrient.

09-2050 Palatlakaha River 2839M LAKE LOUISA LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 5 / 38 not Impaired; vp = 5 / 19 Impaired. DO met the verification threshold and TN was identified as the causative pollutant. 19 TN measurements, median 1.97 mg/L. 21 TP measurements, median 0.06 mg/L. 4 BOD measurements, median 0.42 mg/L.

09-2051 Palatlakaha River 2839M LAKE LOUISA LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for White Catfish. 12 White Catfish samples, Hg mean concentration was 0.56 mg/Kg in 2005.

09-2052 Palatlakaha River 2839N LAKE MINNEHAHA LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Largemouth Bass. 12 Largemouth Bass samples, Hg mean concentration was 1.28 mg/Kg in 2005.

09-2053 Palatlakaha River 2883 LITTLE CREEK STREAM 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 23 / 29 Potentially Impaired; vp = 13 / 14 Impaired. DO met the verification threshold and TN was identified as the causative pollutant. 11 TN measurements, median 2.73 mg/L. 14 TP measurements,

median 0.12 mg/L. 5 BOD measurements, median 1.0 mg/L.

09-2054 Rodman Reservoir Unit 2740A OCKLAWAHA RIVER ABOVE STJOHNS RIVER STREAM 3F Mercury (Based on Fish Consumption Advisory) Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Largemouth Bass. 24 Largemouth Bass samples, Hg mean concentration was 0.44 mg/Kg in 2003.

09-2055 Rodman Reservoir Unit 2740B LAKE OCKLAWAHA LAKE 3F Mercury (Based on Fish Consumption Advisory) Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Largemouth Bass. 24 Largemouth Bass samples, Hg mean concentration was 0.44 mg/Kg in 2003.

09-2056 Rodman Reservoir Unit 2740C OCKLAWAHA RIVER ABOVE LAKE OCKLAWAHA STREAM 3F Dissolved OxygenDissolved Oxygen < 5.0 mg/L Medium pp = 102 / 296 Potentially Impaired; vp = 88 / 206 Impaired. DO met the verification threshold, but unable to determine the causative pollutants. 189 TN values, median 1.20 mg/L. 193 TP values, median 0.05 mg/L. 3 BOD observations, median 2.1 mg/L. The FDEP has drafted a TMDL, which is now pending.

09-2057 Rodman Reservoir Unit 2740C OCKLAWAHA RIVER ABOVE LAKE OCKLAWAHA STREAM 3F Mercury (Based on Fish Consumption Advisory) Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. Confirmed recent data for freshwater fish advisory for Largemouth Bass. 24 Largemouth Bass samples, Hg mean concentration was 0.44 mg/Kg in 2003.

## Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009 Hydrologic Unit: Ocklawaha River

May 15, 2009 7 of 8 Florida Department of Environmental Protection OGC Case

NumberPlanning Unit WBID Water Segment NameWaterbody Type Waterbody Class1 1998 303(d) Parameters of Concern Parameters Assessed Using the

Impaired Waters Rule (IWR) pp = 29/30 Potentially

Impaired; vp = 34/37 Impaired. Concentration Causing Impairment Priority for TMDL Development2 Comments (# of Exceedances/ # of Samples) pp=Planning Period vp=Verified Period3

09-2058 Rodman Reservoir Unit 2740C OCKLAWAHA RIVER ABOVE LAKE OCKLAWAHA STREAM 3F Nutrients Nutrients (Historic Chlorophyll-a) TN = 1.20 mg/L TP = 0.05 mg/L Medium pp = Annual mean chla in three consecutive years(1998, 1999, and 2000) exceeded the historic minimum (2.02 ug/L calculated based on data from 1977 - 1981) by more than 50%, Potentially Impaired. Annual means were 1.94 ug/L (1995), 6.87 ug/L (1996), 2.55 ug/L (1997), 6.24 ug/L (1998), 3.20 ug/L (1999), 6.66 ug/L (2000), 2.01 ug/L (2001), 1.15 ug/L (2002), 3.24 ug/L (2003), and 1.86 ug/L (2004). 216 Chla (corrected) values, range 1.0 - 94.0 ug/L, mean 4.01 ug/L. vp = Annual

mean Chla in two consecutive years (2005 and 2006) exceeded the historic minimum by more than 50%., Impaired. Annual means were 6.66 ug/L (2000), 2.01 ug/L (2001), 1.15 ug/L (2002), 3.24 ug/L (2003),

1.86 ug/L (2004), 6.59 ug/L (2005), and 3.64 ug/L (2006). 184 Chla

(corrected) values, range 1.0 - 94.0 ug/L, mean 4.17 ug/L. 189 TN values, median 1.2 mg/L. 193 TP values, median 0.045 mg/L. The median value of 191 TN/TP ratios is about 28, suggesting phosphorus and nitrogen co-limiting. The FDEP has drafted a TMDL, which is now pending.

09-2059 Rodman Reservoir Unit 2769 DAISY CREEK STREAM 3F Chlorine ≤ 0.01 mg/L Medium pp = 8 / 8 Potentially Impaired; vp = 8 / 8 Impaired

09-2060 Rodman Reservoir Unit 2769 DAISY CREEK STREAM 3F Dissolved OxygenDissolved Oxygen < 5.0 mg/L Medium pp = 14 / 18 Potentially Impaired; vp = 14 / 22 Impaired. DO met the verification threshold and TN was identified as the causative pollutant. 13 TN measurements, median 1.73 mg/L. 14 TP measurements, median 0.22 mg/L. 4 BOD measurements, median 0.7 mg/L. EPA believed a DO TMDL was not needed for this waterbody.

09-2061 Rodman Reservoir Unit 2769 DAISY CREEK STREAM 3F Lead > e(1.273 [lnH] - 4.705); Medium pp = 9 / 9 Potentially Impaired; vp = 11 / 13 Impaired

09-2062 Rodman Reservoir Unit 2771A LAKE EATON LAKE 3F Dissolved Oxygen < 5.0 mg/L Medium pp = 1 / 1 Insufficient Data; vp = 7 / 9 Impaired. DO met the verification threshold and TN and TP was identified as the causative pollutant. 5 TN

measurements, median 1.76 mg/L. 5 TP measurements, median 0.12 mg/L. No BOD measurements.

09-2063 Rodman Reservoir Unit 2771A LAKE EATON LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. 12 Largemouth Bass samples, Hg mean concentration was 0.40 mg/Kg in 2004.

09-2064 Rodman Reservoir Unit 2779A MILL DAM LAKE LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* A limited consumption advisory was issued by the DOH. The mercury impairment was verified based on results from 10 fishes in the verified

period. The mean Hg concentration in fish tissue was 1.09 mg/kg in 2000.

09-2065 Rodman Reservoir Unit 2782C LAKE BRYANT LAKE 3F Mercury (based on fish consumption advisory) > DOH threshold (>0.3 mg/kg) High* Data verified to be within the last 7.5 years. 15 Largemouth Bass samples, Hg mean concentration was 0.36 mg/Kg in 2003 and 2004.

09-2066 Marshall Swamp Unit 2772A Silver Springs SPRING 3F Nutrients (Algal Mats) Nitrate+Nitrite > 0.60 Medium The Groundwater Protection Section determined this waterbody has median Nitrate+Nitrite concentration > 0.60 mg/L and abundant algal mats such that the flora is imbalanced.

09-2068 Marshall Swamp Unit 2772A Silver Springs SPRING 3F Nutrients (Algal Mats) Nitrate+Nitrite > 0.60 Medium The Groundwater Protection Section determined this waterbody has median Nitrate+Nitrite concentration > 0.60 mg/L and abundant algal mats such that the flora is imbalanced.

09-2069 Marshall Swamp Unit 2772C Silver Springs Group SPRING 3F Nutrients (Algal Mats) Nitrate+Nitrite > 0.60 Medium The Groundwater Protection Section determined this waterbody has median Nitrate+Nitrite concentration > 0.60 mg/L and abundant algal mats such that the flora is imbalanced.

09-2070 Marshall Swamp Unit 2772E Silver River Upper SPRING 3F Nutrients (Algal Mats) Nitrate+Nitrite > 0.60 Medium The Groundwater Protection Section determined this waterbody has median Nitrate+Nitrite concentration > 0.60 mg/L and abundant algal mats such that the flora is imbalanced.

09-2071 Rodman Reservoir Unit 2782C LAKE BRYANT LAKE 3F Nutrients (TSI) TP = 0.03 mg/L Medium pp = Potentially Impaired. 1 TSI annual mean exceeded the threshold. Annual means were 63.1 (1995), 49.5 (1996), and 49.9 (1997). vp = Insufficient data to calculate any annual mean. 2 TN values, median 1.36. 5 TP values, median 0.027. The median value of 116 TN/TP ratios is about 48, suggesting phosphorus is the limiting nutrient. The waterbody was listed in the 1st cycle assessment for nutrient impairment.

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

## Ocklawaha River Basin Group 1 Cycle 2 Assessment/Central District - Verified List Revised and Readopted May 2009 Hydrologic Unit: Ocklawaha River

May 15, 2009 8 of 8 Florida Department of Environmental Protection OGC Case

NumberPlanning Unit WBID Water Segment NameWaterbody Type Waterbody Class1 1998 303(d) Parameters of Concern Parameters Assessed Using the

Impaired Waters Rule (IWR) pp = 29/30 Potentially

Impaired; vp = 34/37 Impaired. Concentration Causing Impairment Priority for TMDL Development2 Comments (# of Exceedances/ # of Samples) pp=Planning Period vp=Verified Period3

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

3PP- Planning Period (January, 1995 through December, 2004);VP- Verified Period (January, 2000 through June 30, 2007)

*A statewide TMDL for mercury, that will address this waterbody, is scheduled to be completed in 2012.

The Group 1 second cycle Ocklawaha River Basin Verified List is based on IWR Run_31