Assessing Pinellas County Surface Water Quality Using a

Probabilistic Design

Kelli Hammer Levy, Andrew P. Squires and Mark Flock,Pinellas County Department of Environmental Management

AndDavid Wade and Anthony Janicki,

Janicki Environmental, Inc.

Water Quality Monitoring in Pinellas County

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Boca Ceiga Bay 2003

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0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00Dissolved Oxygen (ppm)

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PastPresent Future

Past (1991-2002)

Fixed site program;Professional judgement;Gaps in coverage;Tidal influences; andLimited trend analysis.

Present (2003)Three-Tiered Monitoring

Approach

Probabilistic monitoring design;Fixed site monitoring program; andEMC development.

Probabilistic Design Objectives

NPDES permit obligations;Status and trend information;Reporting;State Policy and County Comprehensive Plan requirements;Identify problems;

Probabilistic Design Objectives

Measure improvements;Prioritization of management efforts;Maximize effort and fill data gaps;Develop quantitative water quality targets;Aerial estimates of water quality; andMagnitude and direction of change.

Probabilistic Program Design Elements

Temporal sampling unitsSpatial sampling unitsPopulations of interest

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Future Reporting Annual summaries;East vs. West, grouped or individual strata and TBEP bay segments;Wet and dry season statistics;Cumulative frequency distributions;Impaired waters rule;Problem areas; andAdjustments to program.

2 3 4 5 6 7 8 9 1011121314DISSOLVED OXYGEN (PPM)

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2001200019991998199719961995

BOCA CIEGA BAY

Fixed Monitoring Program

47 fixed stream sites located in 22 basins;Water quality samples, Hydrolab® parameters, and flow measurements;Loading estimates.

Water quality and flow site in Cedar Creek, Dunedin, FL.

EMC Development

Evaluating stormwater treatment efficiency; Lake Seminole Watershed, Seminole, FL.

Pinellas County Program

Statistically defensible open water monitoring program;Stream loading estimates; andBasin specific EMC data and BMP evaluations.

Questions ?

For additional information contact:The Pinellas County Department of Environmental Management

Water Resources Management Section300 South Garden Avenue

Clearwater, FL 33756(727) 464-4425

http://www.pinellascounty.org/Environment/