FACILITY PLAN AND NEEDS ASSESSMENT
A.C. Ward Water Treatment Plant
West Des Moines Water Works, West Des Moines, Iowa
FACILITY PLAN AND NEEDS ASSESSMENT STUDY
• Technical Memorandum No. 1 – Regulations, Goals, and Desired Improvements
• Technical Memorandum No. 2 – Evaluation of Existing Facilities
• Technical Memorandum No. 3 – Plant Process and Code Evaluation
• Technical Memorandum No. 4 – Facility Improvements and Alternatives Evaluation
• Facility Plan and Needs Assessment Report & Capital Improvements Plan
Study Comprised of 5 Tasks:
TECHNICAL MEMORANDUM NO. 1
Regulations, Goals, and Desired Improvements
REGULATIONS, GOALS AND DESIRED IMPROVEMENTS
• Evaluate Condition of Existing Infrastructure
• Process, Structural, Architectural, Mechanical, Electrical, and Hazardous Materials
• Evaluate Water Treatment Plant Capacity
• Existing Unit Process Capacities
• Existing Hydraulic Capacity/Identify Bottlenecks
• Identify Improvements to Further Improve Water Plant Redundancy
• Other Desired Improvements
• Improve Recarbonation System Redundancy and Reliability
• High Service Pumping Improvements
• Evaluate Filter Media Replacement
Goals and Objectives Identified for the Study:
REGULATIONS, GOALS AND DESIRED IMPROVEMENTS
• Water Quality Improvements
• Improve Taste and Odor
• Total Dissolved Solids Reduction
• Fluoride Reduction
• Manganese Reduction
• Sulfate Reduction
• Evaluate Regulatory Compliance
• Identify Applicable Codes and Standards
• Lead and Copper Rule Changes
• Historical IDNR Sanitary Survey (e.g. cover Solids Contact Units)
Goals and Objectives Identified for the Study:
REGULATIONS, GOALS AND DESIRED IMPROVEMENTS
• Evaluate Compliance with Future Regulations
• Ground Water Under the Influence Standards
• Potential Per- and PolyFluoroalkyl Substances (PFAS) Limits
• Potential Perchlorate Limits
• Distribution Department Space Needs
Goals and Objectives Identified for the Study:
TECHNICAL MEMORANDUM NO. 2
Evaluation of Existing Facilities
EVALUATION OF EXISTING FACILITIES
• Current Condition of Water Treatment Facility
• Structural
• Mechanical
• Electrical
• Current Condition of Unit Processes & Remaining Useful Life
• Presence of Hazardous Materials (Visual Inspection Only)
• Distribution Department Spaces and Future Needs
• Office and Garage Space
Evaluation looked at the following:
EVALUATION OF EXISTING FACILITIES
Building No. 1 Structural Issues
BUILDING NO. 1
VERIFY IF CONCRETE TANK REPAIRS ARE NECESSARY BEHIND BRICK VENEER DURING REPLACEMENT REMOVE AND REPLACE STEEL ROOF DECK, REPAINT ROOF FRAMING, AND REROOF
REMOVE AND REPLACE DOOR
REPAIR DETERIORATED CONCRETE TANK WALL REINFORCE WALL AND TIE INTO ROOF DIAPHRAGM
REMOVE AND REPLACE EXISTING DETERIORATED BRICK VENEER REMOVE AND REPLACE CONCRETE MASONRY VENEER
CUT & POINT ALL BAD CONCRETE MASONRY UNIT MORTAR JOINTS, REPAINT
CUT & POINT ALL BAD BRICK MORTAR JOINTS, CLEAN, AND APPLY WATER REPELLENT REMOVE AND REPLACE CAST STONE AND WINDOWS
REPAINT ROOF FRAMING
PREPARE AND PAINT ALL EXPOSED HOLLOWCORE STEEL CONNECTIONS LEGEND
BUILDING NO. 1
VERIFY IF CONCRETE TANK REPAIRS ARE NECESSARY BEHIND BRICK VENEER DURING REPLACEMENT REMOVE AND REPLACE STEEL ROOF DECK, REPAINT ROOF FRAMING, AND REROOF
REMOVE AND REPLACE DOOR
REPAIR DETERIORATED CONCRETE TANK WALL REINFORCE WALL AND TIE INTO ROOF DIAPHRAGM
REMOVE AND REPLACE EXISTING DETERIORATED BRICK VENEER REMOVE AND REPLACE CONCRETE MASONRY VENEER
CUT & POINT ALL BAD CONCRETE MASONRY UNIT MORTAR JOINTS, REPAINT
CUT & POINT ALL BAD BRICK MORTAR JOINTS, CLEAN, AND APPLY WATER REPELLENT REMOVE AND REPLACE CAST STONE AND WINDOWS
REPAINT ROOF FRAMING
PREPARE AND PAINT ALL EXPOSED HOLLOWCORE STEEL CONNECTIONS LEGEND
EVALUATION OF EXISTING FACILITIES
Building No. 1 Structural Issues (1953 Original
Construction)
EVALUATION OF EXISTING FACILITIES
Building No. 1 Structural Issues (1971 Addition)
EVALUATION OF EXISTING FACILITIES
Building No. 1 Structural Issues (1996 Addition)
EVALUATION OF EXISTING FACILITIES
Building No. 3 (Chemical Feed – Structural Repairs)
EVALUATION OF EXISTING FACILITIES
Recarbonation System
EVALUATION OF EXISTING FACILITIES
Building No. 3 (Chemical Feed)
EVALUATION OF EXISTING FACILITIES
Backup Generator Automatic Transfer Switch
EVALUATION OF EXISTING FACILITIES
High Service Pumping
EVALUATION OF EXISTING FACILITIES
Building No. 5 (Garage)
EVALUATION OF EXISTING FACILITIES
Clearwell
EVALUATION OF EXISTING FACILITIES
Electrical and Controls Upgrades
• MCC Upgrades
• Plant Controls/PLC Upgrades
TECHNICAL MEMORANDUM NO. 3
Plant Process and Code Evaluation
PLANT PROCESS AND CODE EVALUATION
• Capacity of Unit Processes
• Current plant capacity = 12.0 MGD
• Unit Process Design Standard Deficiencies
• 10 States Standards
• Hydraulic Test
• Confirm hydraulic model
Evaluation reviewed the following:
Unit Process Rated
Capacity, MGD
Aeration 11.5/14.3
Detention Tanks 10.4(1)
Solids Contact Units 17.5
Recarbonation Tank 1.9
Filters 13.1
Clearwell Transfer Pumps 12.2
High Service Pumps 15.1
Lime Residuals Dewatering 12.0
NOTE: (1)Detention tanks and detention times not applicable
PLANT PROCESS AND CODE EVALUATION
• Building Code Compliance
• Structural, Architectural, Electrical, Mechanical, and Hazardous Materials
• Only areas where improvement recommended
• Distribution Department Space Needs
• Office Space Needs: 2,060 sq. ft
• Equipment Storage/Garage Needs: 4,440
Evaluation reviewed the following:
TECHNICAL MEMORANDUM NO. 4
Facility Improvements and Alternatives Evaluation
FACILITY IMPROVEMENTS & ALTERNATIVES EVALUATION
Alternatives Evaluated and Recommended Improvements
Improv. No. Improvement Description Project Cost
1 Aerator/Detention Tank Improvements $1,090,000
2 Cover Solids Contact Units $1,354,000
3A Recarbonation System Improvements – Convert to PSF System $3,195,000 3B Recarbonation System Improvements – Upgrade Existing System $890,000
4 Filter Improvements $1,077,000
5 High Service Pumping Improvements $1,032,000
6 Clearwell Improvements $225,000
7 Metering Improvements $1,467,000
8 Miscellaneous Projects to Comply with 10 States Standards $334,000 9 Upgrades to Comply with Ground Water Under the Influence Standards $1,213,000
10 Sulphate Reduction N/A
11 Building No. 1 Structural Repairs $1,120,000
FACILITY IMPROVEMENTS & ALTERNATIVES EVALUATION
Alternatives Evaluated and Recommended Improvements (continued)
Improv. No. Improvement Description Project Cost
12 Miscellaneous Structural and Architectural Repairs $337,000
13 Miscellaneous Process Repairs $1,017,000
14 Mechanical Improvements $1,020,000
15 Electrical Improvements $952,000
16A Space Needs Improvements – Combined Distribution Office and Garage $2,578,000 16B Space Needs Improvements – Separate Distribution Office and Garage $2,464,000
IMPROV. 16A & 16B - DISTRIBUTION OFFICE AND GARAGE
FACILITY PLAN & NEEDS ASSESSMENT
Recommended Capital Improvements Plan
RECOMMENDED CAPITAL IMPROVEMENTS PLAN 0 – 5 YEARS
Improv. No. Improvement Description Project Cost CIP Year
8.e/c/ Relocate Chlorine Feed Lines out of Ferric Room $4,000 1
11.a. Building No. 1 Structural Repairs $565,000 1
11.b. Relocate/new MCC 1 $641,000 1
15.c. Replace ATS $285,000 1
3A.c. New 30-Ton Vertical CO2 Storage Tank $562,000 2
5.a. Replace HSP No. 3 (Includes isolation valves, check valve, and VFD installation) $301,000 2
15.d. SCU#1 Mixer VFD $20,000 2
6.a. Replace Clearwell Valve Structure $44,000 3
6.b. Clearwell Access Hatch Improvements $43,000 3
6.c. Repaint Transfer Pumps and Piping $11,000 3
6.d. Clearwell Tank Cap Waterproofing $144,000 3
8.f. Backwash Reclaim Tank Improvements $38,000 3
8.g. Filter 5-8 Effluent Box Hatch Improvements $22,000 3
12.a. Building No. 2 Structural Repairs $12,000 3
12.b. Building No. 3 Structural Repairs $116,000 3
12.c. Building No. 4 Structural Repairs $59,000 3
12.e. Building No. 6 Structural Repairs $59,000 3
13.f. Replace Backwash Reclaim Pump $43,000 3
13.c. Clean and Recoat West Reservoir $619,000 4
16A. Space Needs Improvements - Combined Distribution Office and Garage $2,776,000 5
CIP Year
Total Project Cost
1 $1,495,000
2 $883,000
3 $580,000
4 $630,000
5 $2,776,000
TOTAL $6,364,000
RECOMMENDED CAPITAL IMPROVEMENTS PLAN 5 – 10 YEARS
Improv. No. Improvement Description Project Cost
4.b. Replace Air Backwash Blower $145,000
7.b. Filter Air Backwash Metering $35,000
4.c. Miscellaneous Filter Improvements (Repainting and Valve Stem Replacements) $136,000 5.a. Replace HSP No. 2 (Includes isolation valves, check valve, and VFD installation) $288,000
5.b. Replace Process Valves for HSP Nos. 1, 4, and 5. $396,000
5.c. Install VFDs on HSP Nos. 1, 4, and 5. $222,000
5.d. Repaint Piping & Pumps $32,000
8.e. Ferric Chloride Feed System Improvements $100,000
12.d. Building 5 Structural-Architectural Demolition $135,000
14.a. Building No. 1 – Mechanical Repairs - Filter Room Dehumidifier $356,000
14.b. Building No. 1 – All Other Mechanical Improvements $311,000
14.c. Building No. 3 - Mechanical Repairs $356,000
14.d. Building No. 4 - Mechanical Repairs $44,000
14.f. Building No. 6 - Mechanical Repairs $207,000
15.a. Replace MCC Buckets $438,000
TOTAL $3,201,000
RECOMMENDED CAPITAL IMPROVEMENTS PLAN 10 – 15 YEARS
Improv. No. Improvement Description Project Cost
2a. Install Covers on SCUs $1,777,000
2b. Install Overflows on SCUs $182,000
3B.a. Existing Recarbonation Tank Improvements $33,000
3B.b. New Pressure Solution Feed System $499,000
3B.c. Replace 14 Ton CO2 with 30 Ton $755,000
13.a. Lime and Soda Ash Level Sensor Replacement $56,000
13.b. Lime and Soda Ash Bin Cleaning and Repainting $111,000
13.d. Repair and Repaint SCU #3 $405,000
TOTAL $3,818,000
RECOMMENDED CAPITAL IMPROVEMENTS PLAN 15+ YEARS
Improv. No. Improvement Description Project Cost
1 Aerator/Detention Tank Improvements $1,828,000
3A.a. New Recarbonation Tank and Feed Building $3,905,000
7.a. SCU Influent Metering $247,000
7.c. Filter Effluent Metering $2,167,000
9.a. Install Turbidimeters $319,000
9.b. Install Filter-to-Waste Piping, Valves, and Controls $1,268,000
9.c. Filter-to-Waste Tank $448,000
TOTAL $10,182,000
RECOMMENDED CAPITAL IMPROVEMENTS PLAN
CIP
Years Total Project Cost
0 - 5 $6,364,000
5 - 10 $3,201,000
10 - 15 $3,818,000
15+ $10,182,000
TOTAL $23,565,000
20-Year CIP Summary:
Facility Plan and Needs Assessment
A.C. Ward Water Treatment Plant, West Des Moines Water Work
