Miami-Dade Water & Sewer Department Miami-Dade Water and Sewer Department | www.miamidade.gov/water February 25, 2016 Nutrient Reduction by Use of Industrial Deep Injection Wells, Miami-Dade County, Florida Virginia Walsh, PhD, P.G. Ed Rectenwald, P.G.
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Miami-Dade Water & Sewer Department
Miami-Dade Water and Sewer Department | www.miamidade.gov/water
February 25, 2016
Nutrient Reduction by Use of Industrial Deep Injection Wells,
Miami-Dade County, Florida
Virginia Walsh, PhD, P.G.Ed Rectenwald, P.G.
Miami-Dade Water and Sewer Department (WASD) Overview
• Largest water and sewer utility in Florida, serving more than
2.2 million residents
• Water System:
3 large regional and 5 small water treatment plants
Supplying an average of 304 million gallons per day
90% of the County’s public water supply
Per capita water use 137 gpcd
100 water supply wells
Biscayne Aquifer
Floridan Aquifer
Aquifer Storage and Recovery
7,918 miles of pipes (12.740 km)
38,381 fire hydrants
126,913 valves
WASD Overview
• Wastewater System:
3 wastewater treatment plants
2 ocean outfalls (3 and 7 miles from
coast) and 21 deep injection wells
(~2,500 ft depth)
Collecting, treating, and disposing 316
MGD
6,292 miles of mains and laterals
1,042 sewer pumps stations (operated)
Reusing 10.2 MGD
WASD Water & WastewaterTreatment Facilities
Ocean Outfalls
Deep injection
wells
2008 Ocean Outfall LegislationChapter 2008-232, Laws of Florida
• Reduce nutrient loading to the ocean
Meet Advance Wastewater Treatment (AWT) by Dec 31, 2018, or
Reduce cumulative outfall loadings (from 2008-2025) equivalent to AWT from 2018-2025
• December 31, 2025, stop using outfall and implement 60% reuse
EPA
2005
Underground Injection Control Program—Revision to the Federal Underground
Injection Control Required for Class I Municipal Disposal Wells in Florida
(40 CFR Part 146 [FRL-7999-7]).
Requirement for High Level Disinfection(HLD) treatment facilities to be added atthe South District Wastewater TreatmentPlant (SDWWTP).
An HLD facility is required before a permit for theconstruction of any new Class I municipal injectionwells can be issued in South Florida, includingMiami-Dade County.
Anhydrite confining units(not carbonate units)
Current deep
injection well Boulder Zone (within
the FAS)
Potential disposal zones within fractured interval
(not in the FAS)
Exploratory Well Objectives
• Permit as a Class V Exploratory Well
• Perform Standard and Petrophysical Geophysical Logs, Testing, and Coring
• Analyze for sufficient confinement above the Boulder Zone
• Analyze the sub-Floridan confinement above the permeable Cretaceous Formations
• Analyze for adequate injection zone within Cretaceous Formations to approximately 10,000 feet bls
• Complete injection well within the Boulder Zone, Permit as Class I Industrial with Dual-Zone Monitor Well
• Preliminary Evaluation and Site Characterization for future disposal into the permeable Cretaceous Formations Reduce nutrient
loading
Virginia Key Landfill
Interdepartmental Agreement with Miami-Dade Water and Sewer and Public Works and
Waste Management to dispose of groundwater remediation
leachate into adjacent Central District Plant Deep Injection