Water Quality Monitoring in the Leona Watershed Anne McFarland - - PowerPoint PPT Presentation

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water quality monitoring in the leona watershed anne
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Water Quality Monitoring in the Leona Watershed Anne McFarland - - PowerPoint PPT Presentation

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Water Quality Monitoring in the Leona Watershed Anne McFarland July 28, 2011 Uvalde, TX 1 Leona River Segment 2109 303(d) List & Assessment Category 5c for bacteria Standard is not attained recreational use, but additional data

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Water Quality Monitoring in the Leona Watershed Anne McFarland July 28, 2011 Uvalde, TX

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Leona River Segment 2109 303(d) List & Assessment

  • Category 5c for bacteria – Standard is not

attained recreational use, but additional data and information will be collected before a TMDL is scheduled

  • Assessment concern for nitrates

How was this determined?

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Routine Quarterly Monitoring

  • Conducted through Clean Rivers Program

by TCEQ and the Nueces River Authority

  • 4 Stations:

– 18418 Leona River upstream of FM 140 (south

  • f Uvalde)

– 12989 Leona River at Hoags Dam (below

confluence of Cooks Slough, SE of Uvalde)

– 12987 Leona River on Hwy 57 (east of Batesville ) – 12985 Leona River on FM 1581 (most

downstream site)

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Three Assessment Units

  • AU_01 (lower end of segment to

confluence with Yoledigo Creek)

  • AU_02 (confluence of Yoledigo Creek to

the confluence with Camp Lake Sough)

  • AU_03 (from confluence of Camp Lake

Sough to upper end of segment)

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Water Quality Inventory 2010

  • Assessment Period:

– December 1, 2001 – November 30, 2008

  • Data compared to criteria or screening

levels for assessment

  • All parameters assessed as fully supporting
  • r of no concern except E. coli & nitrate

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  • E. coli Assessment

Geometric Mean E. coli (colonies/100 mL) Criteria E. coli (colonies/100 mL) Number of Samples Assessed AU_01 171 126 21 AU_02 233 126 23 AU_03 202 126 31

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Nitrate Assessment

Average Nitrate (mg/L) Screening Level (mg/L) Number Samples Assessed Number Samples Exceed Percent Exceed AU_01 8.17 1.95 23 21 91% AU_02 3.89 1.95 27 23 85% AU_03 2.60 1.95 28 26 93%

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More Monitoring Data Needed

Current monitoring data are considered adequate for assessing impairments and concerns, but not for identifying sources & solutions, therefore, more monitoring data are needed. Proposed Sampling Design focuses on monitoring E. coli and nitrate

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Monitoring Parameters

Include:

  • E. coli
  • Nitrite/nitrate-nitrogen
  • pH
  • Dissolved oxygen
  • Specific conductance
  • Water temperature
  • Flow

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Surface Water Quality Monitoring

  • Routine Ambient Monitoring

– Once every two weeks – 9 Mainstem Sites

  • Targeted Watershed Monitoring

– Monthly – 7 Tributary Sites

  • Routine Effluent Monitoring

– Monthly – 3 Wastewater Treatment Facilities & 1 Permitted Discharge

  • Springflow Monitoring

– Quarterly – Up to 5 Springs

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Proposed Leona Sampling Sites

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Recreational Use Attainability Analysis (RUAA)

Purpose: Ascertain suitability of stream for contact recreation and assess factors that promote/hinder contact recreation along stream.

Includes a historical assessment as well as a current use assessment.

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Recreation Uses – 2010 Standards Expanded Use Categories Primary Contact Recreation (PCR) Secondary Contact 1 (SCR1) Secondary Contact 2 (SCR2) Noncontact Recreation (NCR)

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Primary Contact Recreation (PCR)

Activities that are presumed to involve a significant risk of ingestion of water (e.g. wading by children, swimming, water skiing, diving, tubing, surfing, and the following whitewater activities: kayaking, canoeing, and rafting).

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Secondary Contact 1 (SCR1)

Activities that commonly occur but have limited body contact incidental to shoreline activity (e.g., fishing, canoeing, kayaking, rafting and motor boating).

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Secondary Contact 2 (SCR2)

Similar to SCR1 but activities occur less frequently than SCR1 due to physical characteristics of the water body or limited public access.

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Noncontact Recreation (NCR)

Activities that do not involve a significant risk

  • f water ingestion, such as those with limited

body contact incidental to shoreline activity, including birding, hiking, and biking. Noncontact recreation use may also be assigned where contact recreation activities should not occur because of unsafe conditions, such as ship and barge traffic.

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Expanded E. coli 2010 Standard

Recreation Category Geometric Mean

  • E. coli (colonies/100

mL) Primary Contact 126 Secondary Contact 1 630 Secondary Contact 2 1030 Noncontact 2060

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RUAA: Goal is to Assess 3 Sites per Every 5 Miles of River

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Sampling Design

Questions? Suggestions

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