ST. LUCIE WEST SERVICES DISTRICT UTILITY SYSTEM ENGINEER’S BOND REPORT
for the
UTILITY REVENUE BONDS, SERIES 2024

July 9, 2024

AGENDA

Introduction/Purpose
Management & Operation of the System
Conditions & Regulatory Compliance
Recommended Improvements
Water System Total Project Cost Estimate
Findings And Conclusions
Q&A

Introduction
The Purpose of This Report -

This Utility System Engineer’s Report summarizes our engineering evaluation and findings with regard to the proposal by the St. Lucie West Services District (the "District") to issue the “Series 2024 Bonds”.

SUMMARY OF SERIES 2024 BONDS SOURCES AND USES OF FUNDS [1]	
Sources of Funds:	
Series 2024 Bond Proceeds – Par Amount	$39,100,000.00	
Net Premium/OID	-830,404.80	
Total Sources of Funds	$38,269,595.20	
	
Uses of Funds:	
	
Deposit to Project Fund
Deposit to Reserve Fund (25% of MADS) Capitalized Interest to 10/1/2024
Costs of Issuance	$34,746,777.44 747,929.41
1,595,823.75
1,179,064.60	

Total Uses of Funds	$38,269,595.20	
[1] Amounts provided by District's underwriter and are preliminary and subject to change based on the actual terms regarding the sale of the Series 2024 Bonds.	

Management & Operation of the Systems

Water System

Wastewater System

Irrigation System

SLWSD ROWTP (3-D VIEW)	SLWSD WWTP (AERIAL VIEW)	SLWSD OVERALL IRRIGATION SYSTEM

Condition and Regulatory Compliance

CONDITION AND REGULATORY COMPLIANCE OF WATER SYSTEM:
The water supply and treatment facilities of the Water System for the District are considered to be fully functional and appear to be in good condition. The water system needs improvements to meet the future supply, treatment, and underground injection needs. The Water System is in compliance with the water quality, permit, and operational standards required by the FDEP and the SFWMD.
CONDITION AND REGULATORY COMPLIANCE OF WASTEWATER
SYSTEM: The WWTP and collection systems appear in good operating condition and has had significant WWTP replacement or rehabilitation for the foreseeable future. The WWTP was expanded in treatment capacity and upgraded to remove some nutrients. The Wastewater System has reached the point in its useful life where it requires more regular preventative maintenance, and this preventative maintenance is being proactively completed by the utility operating staff. The Wastewater System is currently in compliance with the wastewater treatment, disposal, and operational standards required by the FDEP. The FDEP WWTP Permit is current through 2027.
CONDITION AND REGULATORY COMPLIANCE OF IRRIGATION
SYSTEM: The Irrigation Permit has capacity to meet the irrigation needs and is in compliance with the permit and regulatory requirements.
Additional improvements are needed on irrigation pumping systems.

Recommended Improvements

One new Floridan Aquifer groundwater well and pump are recommended to increase the firm capacity of the groundwater supply to
6.5 MGD.

Floridan Aquifer Wells 1, 2 & 3	Upgrade to Micro Cartridge Filter

	One new identical vertical cartridge filter with a capacity of
2.4 MGD is recommended to be installed increasing the firm capacity of the cartridge filters to 7.2 MGD	
	Well No. 1	Well No. 2	Well No. 3		
Year Drilled	2005	2005	2005		
Depth Drilled	1,321 ft	1,657 ft	1,895 ft		
Depth & Dia of Casing	908 ft 10 in	885 ft 8 in	765 10 in		
Depth of Grouting	70 ft		
					
Well Pump Capacity	1,400 gpm @ 45 psi		
Motor Size	50		

Recommended Improvements

High Pressure RO Feed Pumps

Degasifier Odor Control Unit

	

Two new identical vertical turbine pumps with capacities of 785 gpm each are recommended to be installed, increasing the capacity to 6.85 MGD while maintaining one standby pump for redundancy.

One new identical degasification unit with a capacity of 2 MGD (or biotrickling filter) is recommended to be installed and operated, increasing the capacity to 6 MGD.

Recommended Improvements

ROWTP Calcite Contactors

 Additional WTP RO Skid

	

Increasing the rated treatment capacity of the plant requires the addition of two new identical calcite contactors with capacities of 300 gpm to be installed increasing the firm capacity of the calcite contactor system to 5.2 MGD assuming a 50% bypass rate.

The current firm capacity of the two operational skids is 3.6 MGD, with the third reserved for redundancy. One new identical RO treatment skid with a capacity of 1.8 MGD is recommended to be installed and operated, increasing the capacity to 5.4 MGD while maintaining one standby skid for redundancy.

Recommended Improvements

SLWSD ROWTP Transfer Pump

One new transfer pump rated at 1,400 gpm with a capacity of 2 MGD is recommended

The ROWTP has two 2-million gallon pre-stressed concrete ground storage tanks. At 4.0 million gallons of finished water storage, no additional on-site WTP storage is recommended at this time.

ROWTP High Service Pumps Set A (upgraded 2019)

 Ground Storage Tank

 
Considering a WTP peaking factor of 1.7, the future capacity of the high-service pumps will be 6.70 MGD.

Summary of Recommended Improvements

UNIT PROCESS	PROPOSED IMPROVEMENTS	PROPOSED CAPACITY (MGD)	
		Expansion	Firm	Rated	
Water Supply	One Duty Floridan Aquifer Groundwater Wells rated for
1,500 gpm with 50 HP Well Pump	2.1	6.4	6.4	
Pretreatment	One Duty 5 micron Vertical Cartridge Filters rated for 2.4 MGD	2.4	7.2	6.4	

Reverse Osmosis	Two Duty Vertical Turbine Pumps rated at 785 gpm @ 245 ft TDH, 3,600 rpm, 150 HP each. (required with new skid)	2.25	6.85	6.4	
	One Two Stage RO Treatment Skid with Inter-Stage Boost in a 28:14 Configuration rated for 1.8 MGD @ 14.2 gpd
flux each	1.8	5.4	4.8	
Primary Disinfection	Second duty Clearwell / CCC 24 ft wide x 52 ft long x 9.5 ft deep; 11,400 CF or 85,272 gal	4.1	8.2	4.8	

Post Treatment	Two Duty Calcite Contactors each rated for 0.86 MGD @
~50% Bypass (required with new skid)	1.7	5.2	4.8	
	One Duty Degasification and 10,000 SCFM Blower.	2.0	6.0	4.8	
	One Duty Odor Control Unit or Biotrickling filter	4.0	8.0	4.8	
Transfer Pumping	One Duty 1,400 gpm @ 30 ft TDH, 25 HP	2.0	5.7	4.8	
Water Storage & Distribution	One Duty High Service Pumping Split Case Centrifugal Pump rated at 1,400 gpm @ 50 HP 5,700 gpm firm pumping capacity required.  7,900 gpm firm pumping
provided @ 1.7 Peak Hour PF	
0.6	
6.7	
4.8	
Concentrate
Disposal	New DIW, 10-in rated up to at 2,000 gpm.	5.1	9.0	4.8	
Chemical Feed	Anti-Scalant, Acid, & Caustic Bulk Storage Tanks, Day Tanks, and Chemical Feed Skids	1.8	5.4	5.4	

Water System Total Project Cost Estimate

Proposed Capacity Expansion Improvements	Probable Construction Cost	
New Raw Water Supply Wells	$2,680,000	
New Raw Water Transmission Main	$463,000	
Chemical Feed System Replacements	$910,000	
Upgrades to ROWTP Cartridge Filtration	$390,000	
Upgrades to ROWTP High-Pressure Pumping Capacity	$1,050,000	
New ROWTP Membrane Skid	$6,560,000	
Upgrades to Calcite Contactors	$504,000	
Upgrades to ROWTP Degasifier and Odor Control System	$1,780,000	
Upgrades to ROWTP Chlorine Contact Chamber/Clear Well System	$1,020,000	
Upgrades to Transfer Pumps	$236,000	
Upgrades to High-Service Pumps	$402,000	
Underground Injection Well A	$13,900,000	
Underground Injection Well Site	$970,000	
Electrical System Upgrades	$2,350,000	
I & C System Upgrades	$413,000	
Construction Cost Subtotal	$33,628,000	
Design Engineering Cost, Study, Permitting Services	$1,910,000	
Engineering Services During Construction	$1,357,500	
Project Cost Total	$36,895,500	

Findings and Conclusions

The existing facilities can reasonably be expected to meet the projected requirements of the System, at least through the Fiscal Year ending September 30, 2029.

In general, the System is in good condition and in compliance with all regulatory permits required for the operation of the System.

The Water System will have sufficient capacity to meet the service area needs of the SLWSD for the five Fiscal Year period ending September 30, 2029, but will require improvements to meet future needs.

No significant funds will be required for additional capital expenditures for the System beyond that identified herein during the Forecast Period.

The addition of significant Reserve CDD utility customers will result in the Reserve CDD being a cost-effective addition to the District System.

A due diligence evaluation of the Reserve CDD water and sewer systems should be completed by SLWSD to bring that system up to the District standard prior to closing.

	Q&A	

Thank you!