Dickinson Bayou Supporting Data #2 CIVE 4312 Spring 2010

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

Dickinson Bayou Map

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

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

Land Use Map Data source: HGAC, 2002

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

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

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

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

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

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

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

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

Enterococci Concentrations at TCEQ Stations LEGEND Enterococci Geometric Mean

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

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

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

Surface Temperature and Bacteria

Surface Salinity and Bacteria

NPDES Discharge Information TCEQ Permit IDPermittee Permitted Flow (MGD) WQ Penreco0.075 WQ Waste Management of Texas, Inc.2.23 WQ Hillman Shrimp & Oyster Co.0.07 WQ Duratherm, Inc.n/a WQ Sea Lion Technology0.02 WQ Galveston County WCID 14.8 WQ Pine Colony WWTF0.05 WQ Meadowland Utility Corp0.023 WQ Via Bayou Inc0.02 WQ R West Development Co., Inc.0.24

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

Eagle Point Tide Elevations

Tributary Stations 2008 Data Collection Sampling Locations

Tributary Station Data 2008 Constituent DO (mg/L) Salinity (ppt) TSS (mg/L) TKN (mg/L) Total P (mg/l) 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

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

Bayou Wildlife Park

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

Data Near Wildlife Park 2008 Constituent DO (mg/L) Salinity (ppt)0.25 TSS (mg/L) TKN (mg/L) Total P (mg/l) 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

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

WWTP Locations

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< Downstream7411.8< Pine Colony Effluent 155, ,920 < Downstream86636< Meadowlands Effluent>241, dL – deciliter, L – Liter, mg- milligrams, MPN – most probable number