Bacteria TMDLs for Brays Bayou November 11, 2008

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Bacteria TMDLs for Brays Bayou November 11, 2008 PARSONS

Outline Watershed Overview Pollutant Pollutant Source Assessment Technical Approach: Load Duration Curves TMDL TMDL Calculations

Brays Bayou Watershed ~170 square miles Located within 2 counties (Harris, Fort Bend) Average Annual Rainfall 47.7 inches (NOAA 2007)

Land Use/Land Cover

303 (d) Listed Assessment Units (2008) Assessment Unit 1007B_01 1007B_02 1007C_01 1007E_01 1007L_01 Water Body Brays Bayou above Tidal Brays Bayou above Tidal Keegans Bayou above Tidal Willow Waterhole Bayou above Tidal Unnamed Non-Tidal Tributary of Brays Bayou Description of Assessment Unit Not Supporting Contact Recreation Use From 11.5 km upstream of confluence with Houston Ship Channel (Brays Bayou Tidal) to SH6 From Alief Clodine Road to SH6 From Harris County line to confluence with Brays Bayou Entire Stream Entire Perennial Portion of Stream

Water Quality Monitoring Stations

E. coli Data for TCEQ Stations from 1996 to 2006 Segment Station ID Geometric Mean Concentration Number of Samples Number of Samples Exceeding Single Sample Criteria % of Samples Exceeding 1007B_01 11138 4116 72 70 97% 1007B_02 15848 1033 70 51 73% 1007C_01 11169 2572 56 56 100% 1007E_01 16652 1241 69 50 72% 1007L_01 16654 944 56 43 77% * Geometric Mean Criteria for E. coli is 126 MPN/100mL and Single Sample Criteria is 394 MPN/100mL

Brays Bayou E. coli Geomeans

Brays Bayou E. coli Longitudinal Profile 1E+06 1E+05 15848 15849 15850 15851 15852 Brays Bayou 11169 11140 15853 16654 15854 16652 15855 11139 15859 11309 11138 E.coli (MPN/dL 1E+04 1E+03 1E+02 Geomean Standard: 126 MPN/dL 1E+01 1E+00 35 30 0 km is at boundary of Segment 1007B with Segment 1007 25 20 15 10 5 Legend Maximum 0 River km Geometric mean Minimum

Outline Watershed Overview Pollutant Source Assessment Technical Approach: Load Duration Curves TMDL Calculations

Wastewater Treatment Plants

Summary of TPDES-Permitted Permitted Facilities in the Study Area Assessment Unit Number of Facilities Total Permitted Flow (MGD) Total Average Monthly Flow (MGD) 1007B_01 12 101.9 54.3 1007B_02 3 17.3 4.9 1007C_01 8 36.1 18.9 1007E_01 4 1.3 0.5 1007L_01 0 0 0

Sanitary Sewer Overflows

Permitted Storm Water for WQ0004685000 Assessment Unit Stream Name Total Area (acres) Area under MS4 Permit (Acres) Percent under MS4 Permit 1007B_01 Brays Bayou Above Tidal 42,053 42,053 100% 1007B_02 Brays Bayou Above Tidal 4,354 4,267 98% 1007C_01 Keegans Bayou Above tidal 11,590 11,243 97% 1007E_01 Willow Waterhole Bayou Above Tidal 8,056 8,056 100% 1007L_01 Unnamed Non-Tidal Tributary of Brays Bayou 888 888 100%

Population Projections Stream Name Assessment Unit 2005 2035 Increase Brays Bayou Above Tidal 1007B_01 438,120 498,328 12% Brays Bayou Above Tidal 1007B_02 31,557 39,361 20% Keegans Bayou Above Tidal 1007C_01 85,170 97,237 12% Willow Waterhole Bayou Above Tidal 1007E_01 64,083 71,869 11% Unnamed Non-Tidal Tributary of Brays Bayou 1007L_01 12,894 13,380 4% Source: HGAC 2007

On-Site Sewage Facilities

On-Site Sewage Facilities Assessment Unit 1007B_01 1007B_02 1007C_01 1007E_01 1007L_01 Stream Name Brays Bayou Above Tidal Brays Bayou Above Tidal Keegans Bayou above tidal Willow Waterhole Bayou Above Tidal Unnamed Non-Tidal Tributary of Brays Bayou OSSF Estimate using 1990 Census method 5 1 120 19 0

Estimated Number of Pets Assessmen t Unit Stream Name Dogs Cats 1007B_01 Brays Bayou Above Tidal 120,874 137,546 1007B_02 Brays Bayou Above Tidal 10,753 12,236 1007C_01 Keegans Bayou above tidal 24,964 28,407 1007E_01 Willow Waterhole Bayou Above Tidal 17,775 20,227 1007L_01 Unnamed Non-Tidal Tributary of Brays Bayou 7,751 8,820

Outline Watershed Overview Pollutant Pollutant Source Assessment Technical Approach: Load Duration Curves TMDL TMDL Calculations

WQM Stations Targeted for TMDL Development

USGS Gages in the Brays Bayou Watershed USGS Gage Number Name Period of Record Data Type 8075000 Brays Bayou at South Main St. 5/25/1936 - Present 6/8/1988 - Present Discharge (cfs) Gage Height (ft) 8074810 Brays Bayou at South Gessner Dr. 10/1/2001 - Present 5/1/1997 - Present Discharge (cfs) Gage Height (ft) 8074800 Keegans Bayou at Roark Rd 9/1/1964-2/11/2004 8/1/1996 - Present Discharge (cfs) Gage Height (ft) 8074780 Keegans Bayou at Keegan Rd 12/10/1964-10/28/1984 12/10/1964-10/28/2002 Discharge (cfs) Gage Height (ft) 8074760 Brays Bayou at Alief, TX 10/1/2006 - Present 9/27/2006 - Present Discharge (cfs) Gage Height (ft) * Highlight - USGS gage station used to project flows.

Flow Percentiles Assessment Unit 1007B_01 1007C_01 1007E_01 1007L_01 1007B_02 Watershed Area (sq. mile) 104.6 18.1 12.6 1.4 6.8 Average Annual Rainfall (inch) 48.4 44.6 52.1 45.8 48.6 Percentile Q (cfs) Q (cfs) Q (cfs) Q (cfs) Q (cfs) 0 12,341 1,320 1,284 109 599 10 495 48 42 3.5 26 20 236 21 15 1.2 13 30 156 14 6.7 0.5 10 40 130 12 4.0 0.30 8.9 50 118 11 2.9 0.20 8.4 60 110 10 2.2 0.15 8.0 70 104 8.7 1.6 0.11 7.4 80 99 7.6 1.1 0.07 6.5 90 94 2.1 0.70 0.02 1.0 100 78 0 0 0 0

LDC Schematic

Load Duration Curve for Brays Bayou Above Tidal (1007B_01) 1.E+07 Escherichia coli Daily Load (10 9 /day) 1.E+06 1.E+05 1.E+04 1.E+03 1.E+02 Load at Single Sample WQ Criterion Load at Single Sample WQ Target EC Observations Existing Geomean Load WWTP Wasteload Allocation Wet Weather Influenced EC Observations 1.E+01 1.E+00 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

Load Duration Curve for Keegans Bayou Above Tidal (1007C_01) 1.E+05 1.E+04 Escherichia coli Daily Load (10 9 /day) 1.E+03 1.E+02 1.E+01 1.E+00 Load at Single Sample WQ Criterion Load at Single Sample WQ Target EC Observations Existing Geomean Load WWTP Wasteload Allocation Wet Weather Influenced EC Observations 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

Load Duration Curve for Willow Waterhole (1007E_01) 1.E+05 1.E+04 Escherichia coli Daily Load (10 9 /day) 1.E+03 1.E+02 1.E+01 1.E+00 1.E-01 Load at WQ Criterion Load at WQ Target EC Observations Existing Geomean Load WWTP Wasteload Allocation Wet Weather Influenced EC Observations 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

Load Duration Curve for Unnamed Non-Tidal Tributary of Brays Bayou (1007L_01) 1.E+04 1.E+03 Escherichia coli Daily Load (10 9 /day) 1.E+02 1.E+01 1.E+00 1.E-01 1.E-02 Load at WQ Criterion Load at WQ Target EC Observations Existing Geomean Load Wet Weather Influenced EC Observations 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

Load Duration Curve for Brays Bayou Above Tidal (1007B_02) 1.E+05 1.E+04 Escherichia coli Daily Load (10 9 /day) 1.E+03 1.E+02 1.E+01 1.E+00 1.E-01 Load at WQ Criterion Load at WQ Target EC Observations Existing Geomean Load WWTP Wasteload Allocation Wet Weather Influenced EC Observations 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

Outline Watershed Overview Pollutant Pollutant Source Assessment Technical Approach: Load Duration Curves TMDL Calculations

TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 TMDL = 1.E+01 1.E+00 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 TMDL = Margin of Safety (TMDL x 0.05) 1.E+01 1.E+00 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 TMDL = Margin of Safety (TMDL x 0.05) 1.E+01 1.E+00 WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 TMDL = Margin of Safety (TMDL x 0.05) WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits 1.E+01 1.E+00 WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 1.E+01 TMDL = Margin of Safety (TMDL x 0.05) LA=TMDL MOS WWTF - WLA MOS WWTF WLA STORMWATER WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits 1.E+00 WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 1.E+01 1.E+00 TMDL = Future Growth Margin of Safety (TMDL x 0.05) LA=TMDL MOS WWTF - WLA MOS WWTF WLA STORMWATER WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 1.E+01 1.E+00 TMDL = Future Growth Margin of Safety (TMDL x 0.05) LA=TMDL MOS WWTF - WLA MOS WWTF WLA STORMWATER WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 1.E+01 1.E+00 TMDL = Future Growth Additional Assimilative Capacity Margin of Safety (TMDL x 0.05) LA=TMDL MOS WWTF - WLA MOS WWTF WLA STORMWATER WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

TMDL Calculations 1.E+06 1.E+05 E. Coli Daily Load (10 9 /day) 1.E+04 1.E+03 1.E+02 1.E+01 Final TMDL TMDL = Future Growth Additional Assimilative Capacity Margin of Safety (TMDL x 0.05) LA=TMDL MOS WWTF - WLA MOS WWTF WLA STORMWATER WLA STORMWATER = (TMDL-MOS MOS-WLA WWTF ) X % of drainage area covered by storm water permits 1.E+00 WLA WWTF = (Permitted Flow X 126 MPN/100mL X Conversion Factor) 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

Final TMDL Allocations Unit TMDL (MPN/day) WLA a WWTF (MPN/day) WLA STORM WLA STORM WATER (MPN/day) LA (MPN/day) MOS (MPN/day) 1007B_01 1.83E+12 8.52E+11 8.82E+11 5.76E+11 b 9.15E+10 1007B_02 1.32E+11 9.88E+10 2.57E+10 9.01E+08 6.60E+09 1007C_01 2.69E+11 2.01E+11 5.18E+10 1.82E+09 1.34E+10 1007E_01 7.42E+10 6.80E+09 6.15E+10 2.16E+09 3.71E+09 1007L_01 6.09E+09 0 5.79E+09 0 3.04E+08 a WLA WWTF includes permitted current and future flows for WWTF

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