GROUNDWATER DISCHARGE: A SOURCE OF NUTRIENTS TO LAKE LOCHLOOSA?
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1 GROUNDWATER DISCHARGE: A SOURCE OF NUTRIENTS TO LAKE LOCHLOOSA? Presented by Margaret Murray April 18, FSU Participants: Natasha Dimova, Ben Mwashote, Bill Burnett, Jeff Chanton DEP Participants: Rick Hicks, Paul Lee, Tom Biernacki, Pete Folland, Nicole Beierle, Brooke Tweedy
2 Overview Objectives Description of Lake Lochloosa Why study Lake Lochloosa? Sampling methods Preliminary Results
3 Objectives Determine if groundwater is a major source of nutrients to the lake Sample for nutrients in surficial aquifer Assess different methods to study groundwater inputs Estimate groundwater seepage to lake Jeff Chanton Bill Burnett
4 Lake Lochloosa Near Gainesville and Ocala Lake 5,705 acres, Little 2,642 acres Shallow, flat bottomed, dark water, floating vegetation, muck bottom Karst, perforated, Hawthorn clay Watershed about 52,000 acres Most surface water flows from north, through creek Land use: forest, wetland, wildlife area, agriculture, residential area
5 Lake Lochloosa Near Gainesville and Ocala Lake 5,705 acres, Little 2,642 acres Shallow, flat bottomed, dark water, floating vegetation, muck bottom Karst, perforated, Hawthorn clay Watershed about 52,000 acres Most surface water flows from north, through creek Land use: forest, wetland, wildlife area, agriculture, residential area
6 Lake Lochloosa Outstanding Florida Waters (OFW) Lake Lochloosa is a Special Water. Meets requirements for exceptional recreational or ecological significance. Aquatic and wetland wildlife habitats
7 Why Study Lake Lochloosa? Outstanding Florida Water Impaired Water Body Nutrients fluctuate but have been high during period of record Long term average: Total Phosphorus Total Nitrogen Chlorophyll Trophic State Index mg/l 2.18 mg/l 82 µg/l 77
8 Impaired Waters Rule (IWR) Impaired Water - Waterbody does not meet water quality standard for its designated use Clean Water Act and Florida Watershed Restoration Act require DEP to identify impaired waters and prioritize restoration DEP, WMDs, counties, volunteers monitor waters and add to database. Add additional data for verified list. Florida does not have SW standard for N and P. Nutrients shall not be altered to cause imbalance in natural populations of aquatic flora or fauna
9 Total Maximum Daily Load (TMDL) The maximum amount of a given pollutant that a waterbody can assimilate without exceeding applicable water quality standards. Consider point sources, nonpoint sources and natural background. Assess all loadings in watershed, not just individual sources
10 Lochloosa TMDL TMDL - Recommended load reductions for Nitrogen and Phosphorus Working with stakeholders to develop a Basin Management Action Plan (BMAP) Uncertainties associated with hydrologic inputs, sources and the origins of nutrients in the lake Anthropogenic sources Natural sources Is groundwater the source of nutrients?
11 Lochloosa Creek, Site 16
12 North Side, Creek
13 North Side
14 North Side
15 East side
16 East side, Near Site 8
17 South side
18 South side
19 South side Site 7
20 West side
21 Sampling Methods and Preliminary Results
22 SJRWMD Thermograph
23 Porosity, Bulk Density Radon in pore water of sediments Sediments
24 Seepage Meter Sampling
25 Seepage Meter
26 Surface Water Sampling Radon (survey and bottle samples) Lab analytes (alkalinity, Ca, Mg, Chl a, phosphorus, ortho-p, NO 2 -NO 3, enterococci, fecal coliform) Physical parameters (DO, temperature, ph, conductance)
27 Lake Lochloosa Radon survey Naturally occurring gas Nonreactive High in groundwater Low in surface water Short half-life (3.8 d) Convert to flow rates
28 Lake Lochloosa Radon Grab Samples Highest radon at Lochloosa Creek, and outlet of creek (sites 2, 16) Elevated radon on north side Low at other sites
29 Surface Water Sample Sites
30 Lake Lochloosa - Impaired Water Analyte 2000 NE 2000 SE 2004 NW 2004 SW Color(pcu) ph DO (mg/l) NN (mgn/l) bdl bdl : drier year, High Chl, TP, Low N 2004: wetter year, High TP, Bdl Chl Eutrophic TP (mgp/l) OP (mgp/l) bdl bdl na na Chl a (ug/l) bdl bdl
31 Surface Water Samples Hi Rn Analyte 7 S 8 SE 10 N 12 NW 14 NE 16 Cr ph DO (mg/l) NN (mgn/l) TP (mgp/l) OP (mgp/l) Chl (ug/l) bdl 30 bdl 2.1 bdl bdl
32 Surface Water Samples Analyte 2000 NE 2000 SE 2004 NW 2004 SW 7 S 8 SE 10 N 12 NW 14 NE Hi Rn 16 Cr SC (umhos/cm) Alk (mg/l) na na Ca (mg/l) na na Mg (mg/l) na na
33 Surface Water Samples Analyte 2000 NE 2000 SE 2004 NW 2004 SW 7 S 8 SE 10 N 12 NW 14 NE Hi Rn 16 Cr Fecal Coliform bdl bdl Enterococci bdl Site 8 is closest to residential area
34 Radon Pore Water Sampling Physical parameters Lab analytes (alkalinity, Ca, Mg, nitrite-nitrate, phosphorus, ortho-p
35 Pore Water Sampling Analyte 7 S 8 SE 10 N 12 NW 13 N Cr BW 15 well 16 Cr ph DO (mg/l) NN (mgn/l) bdl bdl bdl bdl bdl bdl TP (mgp/l) OP (mgp/l) Site 13 had SW radon of 6 dpm/l, site 16 had SW radon of 30 dpm/l
36 Pore Water Sampling Analyte 7 S 8 SE 10 N 12 NW 13 Cr BW 15 well 16 Cr SC (umhos/cm) Alk (mg/l) Ca (mg/l) Mg (mg/l) Rn (LSC) ,907 1,907 Higher SW radon at sites 13 and 16
37 Surface Water-Pore Water
38 Surface Water-Pore Water
39 Additional Research Residential well sampling Push point sampling Strontium isotope sampling and analysis Surface runoff auto samplers Permanent monitoring wells Final report Coordination with basin stakeholders
40
41 The End
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FM 766 US 77 FM 79 US 8 FM 887 SH 8 FM 4 Legend FM 74 FM 67 FM 77 FM 44 FM 88 Monitoring Station Guadalupe River Stream Segment Segment Boundary Tributary Watershed Boundary City Gas Reserve Oil Reserve
Mitchell L. Griffin Jean Bossart CH2M HILL Gainesville, Florida
NPDES STORMWATER DATA RESULTS FOR JACKSONVILLE, FLORIDA INTRODUCTION Mitchell L. Griffin Jean Bossart CH2M HILL Gainesville, Florida New storm water data were collected for the City of Jacksonville's National