Bacteria TMDLs for Halls Bayou November 10, 2008

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Bacteria TMDLs for Halls Bayou November 10, 2008 PARSONS

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

Halls Bayou Watershed ~20 square miles Located within 2 counties (Houston, Harris) Average Annual Rainfall 49.8 inches ((NOAA(NOAA 2007)

Land Use/Land Cover

303 (d) Listed Assessment Units (2008) Segment 1006D_01 1006D_02 1006I_01 1006J_01 Water Body Halls Bayou below US 59 Halls Bayou above US 59 Unnamed Tributary of Halls Bayou Unnamed Tributary of Halls Bayou Description of Assessment Unit Not Supporting Contact Recreation Use Halls Bayou 1 mi. upstream of Confluence w/ Green's Bayou (downstream of Station 16666) Halls Bayou at Jensen Dr. in Houston Trib of Halls at Talton Dr. near Monterrey Ln. Trib of Halls Bayou at Langley Road in North Houston

Water Quality Stations

Assessment Unit E. coli Data for TCEQ Stations from 1996 to 2006 Station ID Geometric Mean Concentration Number of Samples Number of Samples Exceeding Single Sample Criteria % of Samples Exceeding 1006D_01 20023 916 17 10 59% 1006D_02 11126 1511 61 49 80% 1006I_01 16666 1162 78 62 79% 1006J_01 16665 1790 80 70 88% * Geometric Mean Criteria for E. coli is 126 MPN/100mL and Single Sample Criteria is 394 MPN/100mL

Halls Bayou E. coli Geomeans

1.0E+06 Halls Bayou E. coli Longitudinal Profile Halls Bayou E. coli (MPN/100 ml) 1.0E+05 1.0E+04 1.0E+03 1.0E+02 17491 17490 11126 16665 15863 15862 11127 15864 16666 20023 1.0E+01 1.0E+00 30 25 20 15 River Km 0 km is at confluence with Houston Ship Channel Solid symbol indicates tributary location 10 5 Legend Maximum 0 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) 1006D_01 2 7.1 3.82 1006D_02 42 10.65 5.09 1006D_02 0 0 0 1006J_01 3 0.133 0.023

Sanitary Sewer Overflows

Permitted Stormwater For WQ0004685000 Segment Stream Name Total Area (acres) Area under MS4 Permit (Acres) Percent of Watershed under MS4 Jurisdiction 1006D_01 Halls Bayou below US 59 8,182 8,007 98% 1006D_02 Halls Bayou above US 59 18,090 18,090 100% 1006I_01 Unnamed Tributary of Halls Bayou 452 376 83% 1006J_01 Unnamed Tributary of Halls Bayou 1,839 1,839 100%

Population Projections Stream Name Assessment Unit 2005 2035 Increase Halls Bayou below US 59 1006D_01 40,164 51,824 23% Halls Bayou above US 59 1006D_02 95,599 121,775 21% Unnamed Tributary of Halls Bayou 1006I_01 751 990 24% Unnamed Tributary of Halls Bayou 1006J_01 9,256 13,143 30% Source: HGAC 2007

On-Site Sewage Facilities

On-Site Sewage Facilities Segment 1006D_01 1006D_02 1006I_01 1006J_01 Stream Name Halls Bayou below US 59 Halls Bayou above US 59 Unnamed Tributary of Halls Bayou Unnamed Tributary of Halls Bayou OSSF Estimate using 1990 Census method 0 4,042 0 1,157 a Using 12% failure rate.

Estimated Number of Pets Segment Stream Name Dogs Cats 1006D_01 Halls Bayou below US 59 10,956 12,467 1006D_02 Halls Bayou above US 59 15,400 17,524 1006I_01 Unnamed Tributary of Halls Bayou 1,220 1,389 1006J_01 Unnamed Tributary of Halls Bayou 3,433 3,907

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 Halls Bayou Watershed USGS Gage Number Name Period of Record Data Type 8076500 Halls Bayou at Houston, TX 11/1952 09/1993 and 10/2000 - Present 10/1996 - Present Discharge (cfs) Gage Height (ft) * Highlight - USGS gage station used to project flows.

Flow Percentiles Segment 1006D_01 1006D_02 1006I 1006J NRCS Curve Number 80.3 83.9 77.7 84.5 Average Annual Rainfall (inch) 49.1 45.7 55.1 45.7 Percentile Q (cfs) Q (cfs) Q (cfs) Q (cfs) 0 12,005 7,292 92 854 10 127 80 0.9 8 20 55 33 0.34 3.1 30 35 21 0.18 1.6 40 28 16 0.12 1.1 50 24 14 0.09 0.8 60 21 12 0.07 0.6 70 18 11 0.05 0.50 80 15 10 0.04 0.39 90 12 7.8 0.03 0.28 100 1 0.42 0 0

LDC Schematic

1.E+06 Load Duration Curve for Halls Bayou below U.S. 59 (1006D_01) Escherichia coli Daily Load (10 9 /day) 1.E+05 1.E+04 1.E+03 1.E+02 1.E+01 Load at Single Sample WQ Criterion Load at Single Sample WQ Target EC Observations WWTP Wasteload Allocation Wet Weather Influenced EC Observations Existing Geomean Load 1.E+00 1.E-01 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

Load Duration Curve for Halls Bayou above U.S. 59 (1006D_02) 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 1.E+01 Load at Single Sample WQ Criterion Load at Single Sample WQ Target EC Observations WWTP Wasteload Allocation Wet Weather Influenced EC Observations Existing Geomean Load 1.E+00 1.E-01 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

1.E+04 Load Duration Curve for Unnamed Tributary of Halls Bayou (1006I_01) 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 1.E-03 Load at Single Sample WQ Criterion Load at Single Sample WQ Target EC Observations WWTP Wasteload Allocation Wet Weather Influenced EC Observations Existing Geomean Load 0 10 20 30 40 50 60 70 80 90 100 Flow Exceedance Percentile

Load Duration Curve for Unnamed Tributary of Halls Bayou (1006J_01) 1.E+07 1.E+06 Escherichia coli Daily Load (10 9 /day) 1.E+05 1.E+04 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 WWTP Wasteload Allocation Wet Weather Influenced EC Observations Existing Geomean Load 1.E-01 1.E-02 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 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 Assessment Unit TMDL (MPN/day) WLA WWTF (MPN/day) WLA STORM WATER (MPN/day) LA (MPN/day) MOS (MPN/day) 1006D_01 4.58E+11 1.04E+11 3.24E+11 7.51E+09 2.29E+10 1006D_02 2.77E+11 6.17E+10 2.01E+11 0 1.38E+10 1006I_01 2.72E+09 0 2.15E+09 4.35E+08 1.36E+08 1006J_01 2.60E+10 8.22E+08 2.39E+10 0 1.30E+09 a b WLA WWTF = WLA WWTF + Future Growth LA includes upstream loads

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