1. Dickinson Bayou Supporting Data #2 CIVE 4312 Spring 2010

2. Contact Recreation Standards Indicator Bacteria Geometric Mean Concentration Not to Exceed Concentration Fecal Coliform (cfu/dL)200400 E. coli (MPN/dL)126394 Enterococci (MPN/dL)3589 cfu--colony forming unit, MPN -- most probable number

3. Dickinson Bayou Map

4. Dickinson Bayou, Segments Segment1104 Segment1103 Segment1103B Segment1103C Segment1103A Segment1103D SegmentStream Name 1103Dickinson Bayou Tidal 1104Dickinson Bayou Above Tidal 1103ABensons Bayou 1103BBordens Gully 1103CGeislers Bayou 1103DGum Bayou

5. Summary of Land Use in Watershed Data source: HGAC, 2002

6. Land Use Map Data source: HGAC, 2002

7. Exceedances of the Single Sample Standard * Data from GCHD could not be fully validated because of insufficient QA/QC data Criteria used for TCEQ’s WQ assessment:: 1104 = E. coli 1103 = Enterococci Blank histograms indicate compliance with the Geometric Mean Standard

8. Exceedances of the Geometric Mean Standard * Data from GCHD could not be fully validated because of insufficient QA/QC data Criteria used for TCEQ’s WQ assessment:: 1104 = E. coli 1103 = Enterococci Blank histograms indicate compliance with the Geometric Mean Standard

9. Enterococci vs. Time, Upper Region Station Geometric mean of data = 272 MPN/dL % Exceedance of single sample standard (394 MPN/dL) = 34%

10. Enterococci vs. Time, Mid Region Station Geometric mean of data = 128 MPN/dL % Exceedance of single sample standard (89 MPN/dL) = 61%

11. Enterococci vs. Time, Lower Region Station Geometric mean of data = 272 MPN/dL % Exceedance of single sample standard (89 MPN/dL) = 34%

12. E. Coli Geometric Mean Concentrations * Data from GCHD could not be fully validated because of insufficient QA/QC data Segment ID 1104

13. E. Coli Concentrations at TCEQ Stations LEGEND E. coli Geometric Mean

14. Enterococci Geometric Mean Concentrations * Data from GCHD could not be fully validated because of insufficient QA/QC data

15. Enterococci Concentrations at TCEQ Stations LEGEND Enterococci Geometric Mean

16. Outfalls Analyzed by Galveston County Health District IDSizeDescription D324”Outfall draining residential land to Geisler Bayou D424”Outfall draining residential land to Bensons Bayou D548”Confluence of two 48” box culverts draining commercial and residential land D6-Open drainage ditch draining residential land, and large mobile home park to Gum Bayou D748”Concrete culvert draining commercial land (car wash) D836”Outfall draining undeveloped and residential land D924”Open culvert draining undeveloped and residential land to Bensons Bayou D10-Open drainage ditch draining residential land * Data from GCHD could not be fully validated because of insufficient QA/QC data

17. Summary Outfall Data from GCHD Station ID Land Use # of Samples % >394 MPN/dL Date Range Geometric Mean (cfu/dL) D3*Residential1883%Dec 2003 - Apr 2007522 D4*Residential2241%Dec 2003 - Apr 2007369 D5* Comm/ Residential 1856%Dec 2003 - Apr 2007383 D6*Residential2114%Dec 2003 - Apr 2007134 D7*Commercial1540%Dec 2003 - Apr 2007267 D8* Undev/ Residential 2138%Dec 2003 - Apr 2007260 D9* Undev/ Residential 2223%Dec 2003 - Apr 2007145 D10*Residential1867%Dec 2003 - Apr 2007498 * Data from GCHD could not be fully validated because of insufficient QA/QC data

18. GCHD Sampling Locations LEGEND E. coli Geometric Mean * Data from GCHD could not be fully validated because of insufficient QA/QC data

19. Surface Temperature and Bacteria

20. Surface Salinity and Bacteria

21. NPDES Discharge Information TCEQ Permit IDPermittee Permitted Flow (MGD) WQ0000377-000Penreco0.075 WQ0003416-000Waste Management of Texas, Inc.2.23 WQ0003749-000Hillman Shrimp & Oyster Co.0.07 WQ0004086-000Duratherm, Inc.n/a WQ0003479-000Sea Lion Technology0.02 WQ0010173-001Galveston County WCID 14.8 WQ0012935-001Pine Colony WWTF0.05 WQ0013632-001Meadowland Utility Corp0.023 WQ0014326-001Via Bayou Inc0.02 WQ0014440-001R West Development Co., Inc.0.24

22. WWTP Map, Permitted Flows 0.02 MGD 0.03 – 0.08 MGD 0.09 – 0.24 MGD 0.25 – 2.23 MGD 2.24 – 4.80 MGD LEGEND

23. Eagle Point Tide Elevations

24. Tributary Stations 2008 Data Collection 20475 20476 20477 Sampling Locations

25. Tributary Station Data 2008 Constituent2047520477 DO (mg/L)7.25.1 Salinity (ppt)0.31.0 TSS (mg/L)14.925.8 TKN (mg/L)8.710.2 Total P (mg/l)0.20.3 E. coli (MPN/dL)3541,128 Enterococci (MPN/dL)N/A1,697 dL – deciliter, DO – dissolved oxygen, L – Liter, mg- milligrams, MPN – most probable number, ppt – part per thousand n = 7

26. Tributary Wet/Dry Data 2008 ConstituentStationWet Weather Dry Weather TSS (mg/L)2047517.49.1 2047731.013.6 E. coli (MPN/dL)204753544 204771,128158 Enterococci (MPN/dL) 20475N/A 204777,62951 dL – deciliter, L – Liter, mg- milligrams, MPN – most probable number

27. Bayou Wildlife Park

28. Wildlife Park Characteristics 81-acre wildlife park with more 35,000 visitors/year houses 400 exotic animals Most on-site drainage controlled by small ponds, vegetated drainage swales, and berms around some pastures Some denuded areas present near tributary running through facility and near Dickinson Bayou

29. Data Near Wildlife Park 2008 Constituent1146611467 DO (mg/L)8.79.5 Salinity (ppt)0.25 TSS (mg/L)33.542.1 TKN (mg/L)12.915.6 Total P (mg/l)0.430.33 E. coli (MPN/dL)4,6061,498 Enterococci (MPN/dL)N/A6.501 dL – deciliter, DO – dissolved oxygen, L – Liter, mg- milligrams, MPN – most probable number, ppt – part per thousand

30. Wildlife Park Wet/Dry Data 2008 Station 11467 Station 11466 (MPN/dL) (MPN/dL) n = 7 n = 3 n = 7, 2 n = 3,1

31. WWTP Locations

32. WWTP Data 2008 Plant/Location E. coli (MPN/ 100ml) TSS (mg/L) NH3 (mg/L) Ortho- Phosphate (mg/L) Galveston County WCID 1 Upstream3410.3<0.10.3 Downstream7411.8<0.10.6 Pine Colony Effluent 155,310-241,920 <1 - 531.4 - 6.72.1 - 4.1 Downstream86636<0.10.245 Meadowlands Effluent>241,9202.56.56.24 dL – deciliter, L – Liter, mg- milligrams, MPN – most probable number