# Perdido Bay Group 5 Basin / Northwest District - Verified List (Cycle 1 Revised and Readopted May 2009) Hydrologic Unit: Perdido Bay

May 14, 2009 1 of 2 Florida Department of Environmental Protection OGC Case

Number Planning Unit WBID Waterbody Segment Waterbody Type Waterbody Class 1 Parameters Included on the 1998 303(d) List Parameters Assessed Using

the Impaired Waters Rule Concentration Causing Impairment2 Priority for TMDL Development3 Comments (# of Exceedances/ # of Samples) PP=Planning Period VP=Verified Period4

09-0969 Perdido 8999 GULF COAST COASTAL / ESTUARY 3M Mercury (in Fish Tissue) Exceeds DOH threshold (>0.43 mg/kg) High Data verified to be within the last 7.5 years. Confirmed recent data for coastal fish advisory for King Mackerel and Bull Shark. This includes the following WBIDs: 797, 797A, 872, 945, 991, 974, 987, 1004, 1014, 1018, 8001, 8001A, 8001B, and 8001C.

09-0970 Perdido Bay 489 ELEVENMILE CREEK STREAM 3F Dissolved Oxygen Dissolved Oxygen < 5.0 mg/l High PP = 74 / 152; VP = 74 / 170. DO met verification threshold of the IWR; TN, TP, and

BOD are the causative pollutants. 147 TN values, with a median of 4.5 mg/L. 148 TP values, with a median of 0.34 mg/L. 62 BOD values, with a median of 8.8 mg/L. Dr. Livingston DO data, (<4.0 mg/L) PP = 104 / 275; VP = 56 / 141 (<5.0 mg/L) PP = 170 / 275; VP = 87 / 141.

09-0971 Perdido Bay 489 ELEVENMILE CREEK STREAM 3F BOD 5-Day Dissolved Oxygen BOD > 2.0 mg/L High VP = 62 BOD values, with a median of 8.8 mg/L. Dr. Livingston data: PP = 250 BOD values with a median of 6.73 mg/L; VP = 148 BOD values with a median 6.45 mg/L.

09-0972 Perdido Bay 489 ELEVENMILE CREEK STREAM 3F Coliforms Fecal Coliform >400 colonies/100 mL High PP = 55 / 184; VP = 23 / 131

09-0973 Perdido Bay 489 ELEVENMILE CREEK STREAM 3F Un-ionized Ammonia <0.02 mg/L Low PP = 75 / 133; VP = 72 / 121

09-0974 Perdido Bay 489A TENMILE CREEK STREAM 3F Fecal Coliform >400 colonies/100 mL High PP = 9 / 33; VP = 6 / 25. This is a newly verified impairment, but because it adjoins WBID 489 (on the 1998 303 (d) list for Fecal Coliform) it has been assigned a higher priority.

09-0975 Perdido Bay 697 MARCUS CREEK STREAM 3F Coliforms Fecal Coliform >400 colonies/100 mL Low PP = 34 / 107; VP = 17 / 97

09-0976 Perdido Bay 797 UPPER PERDIDO BAY ESTUARY 3M Nutrients Nutrients TN = 0.592 ug/L TP = 0.042 ug/L High PP: Chl a annual means = 12.83 (1994), 7.7 (1998), 7.310 (1999), 8.316 (2000), 7.449 (2001), 7.887 (2002), and 6.41 ug/L (2003). One chl a annual mean exceeded 11 ug/L. VP: Chl a annual means = 7.310 (1999), 8.316 (2000), 7.887 (2002), 6.41 (2003), 11.87 (2004)

and 7.621 ug/L (2005). Co-limited based on median TN/TP ratio of 16.35, using 35 values.

09-0977 Perdido River 2F PERDIDO RIVER STREAM 3F Mercury (in Fish Tissue) Exceeds DOH threshold (>0.43 mg/kg) High Data verified to be within the last 7.5 years. In 2004, 22 Large Mouth Bass had an average mercury concentration of 0.64 mg/kg.

# Perdido Bay Group 5 Basin / Northwest District - Verified List (Cycle 1 Revised and Readopted May 2009) Hydrologic Unit: Perdido Bay

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

Number Planning Unit WBID Waterbody Segment Waterbody Type Waterbody Class 1 Parameters Included on the 1998 303(d) List Parameters Assessed Using

the Impaired Waters Rule Concentration Causing Impairment2 Priority for TMDL Development3 Comments (# of Exceedances/ # of Samples) PP=Planning Period VP=Verified Period4

09-0978 Perdido River 4 BRUSHY CREEK STREAM 3F Coliforms Fecal Coliform >400 colonies/100 mL High PP = 33 / 143; VP = 30 / 137

09-0980 Perdido River 72, 72DF DIRECT RUNOFF TO STM STREAM 3F Mercury (in Fish Tissue) Exceeds DOH threshold (>0.43 mg/kg) High Data verified to be within the last 7.5 years. In 2004, 22 Large Mouth Bass had an average mercury concentration of 0.64 mg/kg. This includes the following WBIDs: 72, 72D, 72E, and 72F.

09-0981 Perdido River 462A-C PERDIDO RIVER ESTUARY 3M Mercury (based on fish consumption) Mercury (in Fish Tissue) Exceeds DOH threshold (>0.43 mg/kg) High Data verified to be within the last 7.5 years. In 2004, 22 Large Mouth Bass had an average mercury concentration of 0.64 mg/kg.

09-0982 Perdido River 462B PERDIDO RIVER STREAM 3F Coliforms Fecal Coliform >400 colonies/100 mL High PP = 6 / 74; VP = 10 / 61

09-0983 Perdido River 542 REST AREA RUN STREAM 3F Fecal Coliform >400 colonies/100 mL Low PP = 7 / 13; VP = 7 / 18

09-0984 Perdido River 542 REST AREA RUN STREAM 3F Turbidity > 53.2 NTU Low A natural background turbidity of 24.2 NTU's was assumed based upon the lower 20th percentile of 36 turbidity measurements taken during the planning and verified periods. The threshold of impairment becomes 53.2 NTU's. PP = 11/17. VP = 16/19.

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,

2The nutrient concentrations represent the 75th percentiles of data from the Verified Period. The target nutrient concentration used in the subsequent TMDL will be determined during the TMDL process.

3Where 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. 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,

and5- Navigation, utility, and industrial use.

4PP - Planning Period (January 1, 1994 through December 31, 2003); VP - Verified Period (January 1, 1999 through June 30, 2006) Verified List is based on IWR Run 29z_2.