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Northwest Hillsborough County Reclaimed Water Characterization for ASR
Presentation
1999 Florida Water ResourcesConferenceTallahassee, FL
April 1999
Presented by
Mark B. McNeal, P.G.
Edward J. Pellenz, P.E.A. Ed Fox, Jr.
Presented at the
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Presentation Overview
Description of Reclaimed Water System in Northwest Hillsborough CountyASR System DescriptionReclaimed Water CharacterizationCycle Testing Plan of ActionBenefits of ASR ProgramConclusions
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Area ofInvestigation
Existing Reclaimed Water Transmission PipelineProposed Transmission Pipeline
(Note: Pipeline locations are approximate)Greater than 250 mg/L Chloride in the Suwannee Limestone
ASR Site
NScale in Miles
210
HillsboroughCounty
NWRWRF
DechlorinationFacility
River OaksAWTP2020””
3636””
1616””
3636””
1212””
3636””
3636””
Dale MabryAWTP
3636””
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Seasonal Storage Needed for Reuse Optimization
Suwannee Limestone
Avon Park Limestone
Alafia River
HillsboroughRiver
Tampa BypassCanal
Ocala Limestone
Tampa Limestone
ASR Well(typ.)
640 MG needed
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ASR Site Selected at NW WRF Discharge
Hillsborough County NorthwestDechlorination Facility
and ASR Phase I Facilities
Hillsborough County NorthwestDechlorination Facility
and ASR Phase I Facilities
River Oaks AWTPRiver Oaks AWTP
To NorthwestRegional WRFTo NorthwestRegional WRF
HillsboroughCounty
ProjectLocation
HILLSBOROUGHCOUNTY
To Dale Mabry AWTPTo Dale Mabry AWTP
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Dep
th in
Fee
t
0
100
200
300
400
500
600
700
800
Holoceneand
PleistoceneUndifferentiated
TampaMember of
ArcadiaFormation
Miocene
SuwanneeLimestoneOligocene
OcalaGroup
Eocene
Avon ParkFormation
ASouthwest
A’Northeast
RMP-14DDechlorination Facility NWH-1NWH-2 RMP-8PZ NWH-4 RMP-7D
Potential ASR Storage ZonePotential ASR Storage Zone
Weathered Limestone
Limestone
Limestone/Foraminieral Coquina
Silty Sand
Clay
Dolomite
Geologic Cross Section Across theNW Hillsborough ASR Study Area
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Reclaimed Water Characterization
Important to evaluate each water reclamation facility for seasonal variations in parametersBi-monthly sampling for 1 year for all parameters (62-550, FAC; pathogens; FDEP minimum criteria for effluent)More frequent (weekly/monthly) sampling for parameters of interest (exceedences)Less frequent sampling following initial year
Anticipate quarterly to semi-annually for full scan
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FDEP Minimum Criteria for Sewage Effluent - NWH County ASR
TolueneChloroform
Diethylphthalate Ammonia
1,2 dichlorobenzeneAldrin
Dimethylphthalate Organic NitrogenTKN
Chloroethane Napthalene Nitrite1,2 dichloroethene Anthracene Total NitrogenDieldrin Phenanthracene Soluble
Orthophosphate2,4,6-Trichlorophenol Phenol
2-chlorophenolTotal Phosphorus
Butylbenzylphthalate Antimony
Cryptosporidium and Giardia Lamblia monitoring also required
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Hillsborough County Reclaimed WaterPrimary Drinking Water Standards
Approx. 23 samples takenInorganics
All metals below MCLsNitrate <2 mg/L (MCL=10)Nitrite <0.05 mg/L (MCL=1)Asbestos not required
Radionuclides below MCLColiforms
Total Col - 4 of 153 >MCLFecal Col - 2 of 174 >MCL
OrganicsDi(2--ethylhexyl)phthalate
• 2 of 11 exceeded DWS• MCL 6 ppb; <5 to 20 ppb
THMs (MCL 100 ppb)• High level disinfection• Average of 4 samples• 1 of 21 exceeded DWS• 108 ppb maximum• May increase in system
All other organics below MCLs
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Hillsborough County Reclaimed WaterSecondary Drinking Water Standards
Approx. 22 samples takenAesthetic ParametersFor Secondary DWSs:
allows annual averaging of monthly samplesallows alternate standard based on native groundwater
Fe/Mn well below MCLsTotal Dissolved Solids
33/165>MCL of 500 mg/LNative water >1,000mg/L
Color21 of 22 <MCL of 15 PCUaverage well below MCL
Odor16 of 17<MCL of 3 TONaverage below MCL
All other secondary DWSs below MCLsNo exemptions needed
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62-610 Rule Revisions Address ASR
Native Water Quality Determines Effluent QualityGreater than 10k TDS - Limited restrictions3k to 10k TDS -Principal treatment + Primary DWSs 1k to 3k TDS - Full Treatment with exceptionsLess than 1k TDS - Full treatment, including primary/ secondary DWSs, total nitrogen, TOC, and TOX limitations
Federal primary DWSs regulated as single sample exceedence, Secondary DWSs as annual average
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62-610 Rule Revisions Address ASR
Reject Storage Requirements3 days needed for full treatment systems (ASR into less than 1,000 mg/L TDS zone, saltwater intrusion barriers, groundwater recharge, etc.)1 day only for principal treatment and most ASR systems (e.g., Hillsborough County)
1,000 to 1,500 mg/L TDS in Storage Zone at Hillsborough County
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Initial Class V, Group 3 Wells Installed
Geologic UnitUndifferentiated
ArcadiaFormation
TampaMember
SuwanneeLimestone
OcalaLimestone
0
50
100
150
200
250
300
350
400
450
500
550
Dep
th B
elow
Lan
d Su
rfac
e (F
eet)
6” Steel
142’TD 170’
Shallow Monitoring WellSMW-1
(radius = 340 feet)
TD 415’
18” Steel
14” Steel
6” Steel
305’
ASR Storage ZoneMonitoring Well SZMW-1
(radius = 370 feet)Test Production Well
TPW-1
TD 415’
30” Steel
24” Steel
16” Steel
305’
Pilot Hole TD 460’(Backplugged with Neat Cement)
WCRWSA Well 14-DShallow Rehabilitation
Monitoring Well (r = 900 feet)
12”
6”
TD 150’
Pilot Hole Backplugged with Neat Cement to 150’
430’
3000 - 4000 mg/L TDS
1000 - 1500 mg/L TDS
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Sampling During Operational Testing
Demonstrate recharge compliance at wellhead with all applicable water quality standardsMonitor at storage zone observation well to evaluate water quality response during resident timeMonitor shallow aquifers to evaluate confinementMonitor recovered water quality for reuse compliance (TSS, Coliforms, BOD, etc.) and customer satisfaction (TDS, Chlorides, etc.)
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LEGEND
Buffer Zone(O-50% Reclaimed Water)
Buffer Zone(50-100% Reclaimed Water)
Section 21Section 21 Section 22Section 22
Section 28Section 28 Section 27Section 27
0.50.5--Mile RadiusMile Radius
Proposed ASR WellProposed ASR WellOnsite Water Supply WellOnsite Water Supply Well
14S14S14D14D
Channel
Channel ““AA””
Waters Ave.
NScale in Feet
8004000
WRF or AWTP
Public AccessReuse System
High QualityReclaimed Water
Class VInjection Well
Low Permeability Low Permeability ZoneZone
Medium to High Medium to High Permeability Permeability ZoneZone
Low Permeability Low Permeability ZoneZone
Typical Recharge Operation (Excess Supply)
Estimated Storage Bubble after 1 Full Year of Recharge
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Section 21Section 21 Section 22Section 22
Section 28Section 28 Section 27Section 27
0.50.5--Mile RadiusMile Radius
Proposed ASR WellProposed ASR WellOnsite Water Supply WellOnsite Water Supply Well
14S14S14D14D
Channel
Channel ““AA””
Waters Ave.
Typical Recovery Operation (Excess Demand)N
Scale in Feet
8004000
Estimated Storage Bubble after 1 Full Year of Recovery
Medium to High Medium to High Permeability Permeability ZoneZone
WRF or AWTP
Public AccessReuse System
High QualityReclaimed Water
Class VInjection Well
Low Permeability Low Permeability ZoneZone
Medium to High Medium to High Permeability Permeability ZoneZone
Low Permeability Low Permeability ZoneZone
LEGEND
Buffer Zone(O-50% Reclaimed Water)
Buffer Zone(50-100% Reclaimed Water)
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Authorization for Cycle Testing Received
Addressed FDEP TAC RFIs following Well Construction Report (August 1998)
Requested 6 months of additional sampling, primarily for phthalates
Conducting Additional Sampling at WellheadPlastic-free sampling station installed (no Tygon, etc.)All 9 monthly samples to date below DEHP MCL of 6 ppbColiform data acceptable at the wellhead (CR 0.5 to 1.5 mg/L)THM increase observed in reuse system; will be controlled
Completing Wellhead (Pump, Piping, Meters, etc)Anticipate cycle testing by September 1999
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NW Hillsborough County ASR Plan of Action
Weekly water quality sampling during recharge events for parameters of interestComposite sample for full scan at completion of cycle test recharge eventContingency for water quality excursions -Cease recharge and initiate recoveryRecover 100 to 120 percent initiallyComprehensive testing at monitoring wells
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Total Reuse Demands by 2015 * Groundwater Pumping Offset *Wetland/Wellfield
3.0 mgd23%
Residential10.8 mgd
50%
Golf Course2.3 mgd
11%
Commercial3.4 mgd
16%
Total Reuse - 21.5 mgd
15
10
5
0
13.2 mgdTotal Reduction
Wat
er C
onse
rvat
ion
Ben
efit
(mgd
)
6.4 mgdGroundwater
6.8 mgdFinished (Potable)Water
Reclaimed Water ASR Benefit - NWH County
*Contingent on Seasonal Storage Development
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Many Reuse Facilities in Various Stages of Reclaimed Water ASR Development
Hillsborough County - Northwest and South/Central SystemsCity of St. PetersburgManatee CountyEnglewood Water DistrictSarasota CountyFlorida Water Services - Lehigh Acres/Marco
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Summary and Conclusions
Reclaimed water ASR integral part of Hillsborough County Reuse OptimizationComprehensive Reclaimed Water Characterization Performed at three AWTPs - Reliably meets drinking water standardsLimited number of DWS Excursions required additional Monitoring for phthalates, coliform, THMsApproved cycle testing program designed to evaluate reclaimed water quality into/out of ASR well, storage zone, and other monitoring intervals
Northwest Hillsborough County Reclaimed Water Characterization for ASR
Presentation
1999 Florida Water ResourcesConferenceTallahassee, FL
April 1999
Presented by
Mark B. McNeal, P.G.
Edward J. Pellenz, P.E.A. Ed Fox, Jr.
Presented at the
