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City Council approves upgrading city’s water and wastewater facilities

The City of Mountain Home’s Water and Wastewater Department received the nod from City Council last Thursday to continue its efforts to update and upgrade the city’s water and wastewater facilities.

The council approved nine separate ordinances for the departments, ranging from purchasing new trucks to purchasing new pumps for its water and wastewater stations.

City Council also agreed to accept three agreements with Garver, an employee-owned multi-disciplined engineering, planning, architectural, and environmental services firm, to develop a 2022 Water and Sewer Master Plan update, complete improvements to the city’s wastewater treatment plant, and evaluate and design improvements to the Southwest Collection System for the city.


Facility upgrades needed


The City of Mountain Home’s plans to overhaul and update its water facilities has been years in the making.

Much of the city’s equipment is older, with some of its water pumps being 30 years old. Finding replacement parts for equipment has also become difficult over the years as much of the city’s tools and equipment are proprietary.

Costs for operating the plants have also gone up over the years. Currently, Mountain Home uses chlorine and sulfur dioxide gas to treat the water that citizens use in their daily lives. The gas has seen a spike in cost as the U.S. economy struggles with inflation.

The city’s sewer systems have also been running a deficit over the past few years. While the city has found ways to cover that deficit, the days of covering down are ending as the deficit is expected to climb to 50% by 2024, potentially driving up consumer rates.

To combat these difficulties, the city has begun to look at switching over to a new UV light system for its water treatment facilities and replacing much of its aging equipment. The move to the new system will lower costs for the city in the long run while also making the city less reliant on dangerous gas shipments coming in from chemical plants.

Once completed, the city expects to turn its deficit into a surplus over time. The cost of the upgrades will be $1,350,000. Costs for the new master plan and the preliminary route studies and evaluation of improvement options will cost the city $100,000 and $50,000 respectively.


Last Thursday’s Ordinances


City Council approved the following ordinances to the city’s Water and Wastewater Department:

  1. An ordinance to purchase new water/sewer auto CAD software for a sum not to exceed $60,000.
  2. An ordinance to purchase two Dodge trucks from Ultimate Auto Group from a sum not to exceed $60,000.
  3. An ordinance to purchase two 4’ Trench boxes to keep employees safe while constructing wastewater lines for a sum not exceeding $29,000.
  4. An ordinance to purchase two Smith & Loveless Pumps to replace 20-year-old pumps at Franklin Lift Station for a sum not to exceed $25,000.
  5. An ordinance to purchase two replacement ABS pumps to replace 20-year-old pumps for CR 390 Lift station for a sum not to exceed $65,000.
  6. An ordinance to purchase three TR-60 70 HP aire-01 triton aerator/mixers to replace existing rotor assembly units used for aerating/mixing wastewater to enhance better efficiency of the wastewater treatment for a sum not to exceed $225,000.
  7. An ordinance to purchase two replacement Grundfos Pumps for Crystal Mtn pump station to replace existing 20-year-old pumps for a sum not to exceed $35,000.
  8. An ordinance to purchase replacement VFDs & soft start controls for Crystal Mtn pump station to replace existing 20-year-old electrical controls for a sum not to exceed $30,000.
  9. An ordinance to purchase WTP, tank & pump station SCADA radio equipment replacements & installation services for SCADA system upgrades to maintain water treatment, water tank levels, pumping capacities, and pump run times from the water plant for a sum not to exceed $78,000.

Project 22W01380


After passing the Water and Wastewater Department’s ordinances, the council accepted an agreement with Garver to develop the city’s new master plan for water and sewer services. They also signed off on an agreement to allow the company to lead the completion of improvements to the city’s wastewater treatment plant.

The first project, titled Project 22W01380, would have Garver “provide services to complete the 2022 Water and Sewer Master Plan Update. The report will build upon the previous Water and Sewer Master Plan update completed in 2012 (“2012 Update”).”

The draft report for the project is expected to be released within six months but may be delayed due to the federal government slow-walking the release of census data for the city.

The cost of Project 22W01380 is $100,000.

Under the agreement, that plan will focus on the existing service area and extensions to the following areas:

a. East Service Area as described in the 2012 Update, which generally extends east of the City to include the Highway 62/412 Bypass.

b. Area southwest of the existing service area as determined by the Southwest Collection System Improvement project analysis.

City staff will be responsible for conducting hydrant flow testing and collection system flow monitoring based on field data collection plans developed by the engineer.

Garver’s engineer will be responsible for the following:

Project Administration

  • a. Coordinate with team members and City personnel.
  • b. Coordinate with the Arkansas Department of Health (ADH) and the Arkansas Natural Resources Commission (ANRC).
  • c. Conduct internal reviews of deliverables with the comments incorporated prior to delivery to owner.
  • d. Provide and coordinate project planning and scheduling tasks of the project.
  • e. Submit monthly invoices to the owner.
  • f. Engineer will attend one in-person kickoff meeting to discuss project objectives, roles and responsibilities, document management, and schedules.
  • g. Engineer will prepare and attend a workshop with the Owner for discussion of the DRAFT Master Plan Update document for completion of a final document.
  • h. Engineer will develop a Project Management Plan (PMP) and Quality Control Plan (QCP) for the project.

Data Collection

Engineer to prepare data request documents related to water and wastewater system information. The initial data request to the city will include but not be limited to:

  • a. Water system files
  • b. Record drawings for water pump stations.
  • c. SCADA data for the last three years
  • d. Wastewater system files
  • e. Record drawings for wastewater lift stations and force mains

Population Projections

The engineer will edit and apply the population projection information developed in the LAKE NORFORK

USAGE WATER ALLOCATION Project for inclusion in the 2022 Master Plan Update.

Water Demand Projections

The engineer will edit and apply the water demand projection information developed in the LAKE

NORFORK USACE WATER ALLOCATION Project for inclusion in the 2022 Master Plan Update.

Water Service Area Considerations

The engineer will examine the Mountain Home existing water service area as defined and approved by the Arkansas Natural Resources Commission (ANRC) and research the possibility of including any other areas that the city could logically service. The potential new service areas would be submitted to the ANRC for Water Plan Compliance.

Water Distribution System Analyses

  • a. Engineer will update the City’s water distribution system hydraulic model in Bentley WaterGEMS based on the City’s existing water system data and record drawings.
  • b. Engineer will define operational controls in the model based on information from SCADA and operator inputs provided by the city.
  • c. Engineer will develop demand scenarios for an average day, maximum month, and maximum day conditions based on historical water billing data.
  • d. Engineer will prepare a hydrant flow test plan to be executed by city staff. City staff will need to be available to operate the hydrants and take flow/pressure measurements.
  • e. Engineer will calibrate and validate the hydraulic model based on historical SCADA information and the hydrant flow test data collected by the city.

Water Treatment Plant Evaluation

GARVER will summarize the current water treatment plant operation and treatment systems. The summary will incorporate the following previous and current examinations:

  • WTP Preliminary Engineering Report including the new clearwell and recommended improvement of new flocculating clarifier, sodium hypochlorite facility, etc.
  • WTP residuals examination covering sludge treatment and disposal, a backwash pump station, and pipe gallery upgrades.
  • Lake intake project Technical Memorandum currently in progress, which includes the intake and transmission main.
  • Lake Norfork Water USACE Allocation request that examines population and usage needs to the year 2050.

These reports and examinations recommend improvements needed to the water treatment plant for providing adequate facilities and operations to meet today’s regulatory requirements and for the future needs and requirements.

 Water System Assessments

  • a. Engineer will assess the following components relative to design and evaluation criteria established in Task 6 and 7.
    • 1. Water supply capacity
    • 2. Water storage capacity
      • i. Total storage
      • ii. Elevated storage
    • 3. Pumping capacity
    • 4. Water treatment capacity
  • b. Engineer will identify capital improvement needs to address gaps in system supply, storage, pumping, and treatment capacity needs based on the assessment.
  • c. Engineer will complete hydraulic model assessments of existing conditions.
  • d. Engineer will complete hydraulic model assessments of buildout conditions and develop infrastructure improvements to address future system buildout.
  • e. Engineer will provide an opinion of probable construction costs (OPCC) for the developed infrastructure improvements. Estimates will be for conceptual design consideration with an expected range of -30% to +50% of potential construction costs.

 Wastewater System Analyses

  • a. Engineer will update the City’s wastewater collection system hydraulic model in Bentley SewerGEMS based on the City’s existing wastewater system data, record drawings, and lift station pump assessments. The city will provide manhole depths to be included in the wastewater model.
  • b. Engineer will define operational controls in the model based on information from SCADA and information provided by the City’s operators.
  • c. Engineer will develop a collection system flow monitoring plan to be executed by City staff. Engineer will calibrate and validate the hydraulic model based on historical information collected on flow and rainfall monitoring.
  • d. Engineer will develop loading scenarios for dry weather, elevated dry weather, and design storm conditions based on historical flow data.

Wastewater Treatment Plant Evaluation

GARVER will summarize the current wastewater treatment plant operation and treatment systems. The summary will incorporate the following previous and current examinations:

  • WWTP Preliminary Engineering Report on plant evaluation and operations done that resulted in the current construction of improvements to the WWTP.
  • WWTP Improvements Evaluation just recently done to further improve the WWTP operations.

These reports and examinations recommend improvements needed to the wastewater treatment plant to provide adequate facilities and operations to meet today’s regulatory requirements and future needs and requirements.

Wastewater System Assessments

  • a. Engineer will assess the following components relative to design and evaluation criteria established in Tasks 9 and 10.
    • 1. Wastewater treatment capacity
    • 2. Lift station capacity
      • i. Wet well volume
      • ii. Pumping capacity
      • iii. Force main capacity
    • 3. Gravity pipe capacity
      • i. Minimum slope
      • ii. Maximum slope
  • b. Engineer will identify capital improvement needs to address gaps in lift station capacity based on the assessment.
  • c. Engineer will complete hydraulic model assessments of existing conditions.
  • d. Engineer will complete hydraulic model assessments of buildout condition and develop infrastructure improvements to address future system buildout, including the preferred alternative selected as part of the Southwest Collection System Improvements project.
  • e. Engineer will provide an opinion of probable construction costs (OPCC) for the developed infrastructure improvements. Estimates will be for conceptual design consideration with an expected range of -30% to +50% of potential construction costs.

Garver will also provide the city with advice on what to upgrade and will assist in determining the construction costs of the city’s facilities.

The final report is due 60 calendar days after the draft report is submitted to the city.


Project 22W01381


The second agreement that City Council agreed too was Project 22W01381.

Under the agreement, Garver will “design and construction support services for the addition of an Ultraviolet Disinfection System, improvements to the Headworks Screw Pumps, Bar Screens, Anoxic Basin Mixers, and Plant Wide Electrical to the Mountain Home Wastewater Treatment Plant.”

The improvement will consist of providing plans and specifications for the following work:

Ultraviolet Disinfection

  1. Remove the existing chlorination / dechlorination storage and feed equipment and gas scrubber.
  2. Design improvements needed to temporarily install the portable Ultraviolet Disinfection System for use while the new Ultraviolet Disinfection System is being installed.
  3. Design the necessary changes to the existing contact chamber to allow for the installation of the Ultraviolet Disinfection System.
  4. Design for the needed electrical equipment installation to power the Ultraviolet Disinfection System.

 Headworks Screw Pumps

  1. Design for the provision of temporary bulkheads to assist in the individual removal of the existing screw pumps.
  2. Specify new coatings for the screw pumps.
  3. Design for needed electrical equipment installation to power the new screw pumps.

 Headworks Bar Screens

  1. Demolish the south bar screen and modify channel for larger bar screen.
  2. Install new mechanical bar screen with heated enclosure in the south channel.
  3. Rehabilitate the existing north mechanical bar screen with new mechanisms and heated enclosure.
  4. Install bar screen washer/ compactor system with bagging system.

Anoxic Basin Mixers

  1. Demolish existing anoxic basin mixers.
  2.  Install new anoxic basin mixers.

Plant Wide Electrical

  1.  Replace existing headworks area motor control center with new walk-in enclosure and electrical cable replacements to screw pumps and anoxic mixers.
  2.  Replace existing motor control center outside of Administration Building with new walk-in enclosure and electrical cable replacements to oxidation ditch aerators/mixers.
  3. Replace existing motor control center inside of Administration Building with new motor control center and electrical cable replacements to NRRS, RAS, and WAS pumps. Install new VFD motor controls and upgrade room HVAC.
  4. Replace existing North Plant (sludge treatment) area motor control center with new walk-in enclosure and electrical cable replacements to aerobic digesters mixers and pumps.
  5. Upgrade Oxidation Ditch operation for dissolved oxygen control with probes and electrical controls.

The total completion cost for this project will cost the city $1,350,000.


Project 21WW01384

This third project will include preliminary route studies and evaluation of improvement options, and an estimate of construction costs. Future work for the project will include detailed design, construction services, and coordination with regulatory agencies.

The Scope of Services is further defined below.

Route Study

Work associated with Task 2 will be a desktop evaluation and route study to evaluate up to four (4) options for routing. Garver will also work with the Owner to review and determine availability of funds for completion of the project. This will be used in the determination of the final project for design and construction.

  • a) Route Evaluation and Alternatives Development. Garver will investigate, recommend, and provide an opinion of probable construction cost for up to four (4) alternatives detailed below and as shown in attachments.
    • i. Sewer service southwest along Highway 62/412 to Buford Road area with pump station pumping back to existing sewer.
    • ii. Sewer service southwest along Highway 62/412 to Buford Road area including Town Park Subdivision with pump station pumping back to existing sewer.
    • iii. Sewer service southwest along Highway 62/412 to Buford Road area and an area south of Highway 62/412 with pump station pumping back to existing sewer or the wastewater treatment plant.
    • iv. Sewer service southwest along Highway 62/412 to Buford Road area including Town Park Subdivision and an area south of Highway 62/412 with pump station pumping back to existing sewer or the wastewater treatment plant.
  • b) Items to be considered in examining the Options.
    • i. Examine capacity of existing sewer where pump station force main might connect.
    • ii. Examine capacity of proposed sewer (and existing sewer if used) with the potential inclusion of the Big Creek subdivision expansion and others to Highway 178. Owner shall obtain any planning documents available from potential areas of development that might be included in this evaluation.
    • iii. Garver will use desktop level planning and mapping tools readily available from existing sources, such as LIDAR, aerial photography, and the map of the existing system to develop the recommendations for improvement.
    • iv. Obtain property maps, if available, to identify owners of properties to be sewered and to reconcile potential routing conflicts.
    • v. Opinion of Probable Construction cost will be developed using existing industry data. In accordance with the Association for the Advancement of Cost Engineering guidelines, the accuracy range of these estimates can vary from – 30% to + 50%.
    • vi. Determine required permitting aspects of project.
  • c) Based on the developed alternatives, Garver will work with Owner to review and confirm final project for final design.

Surveys

Upon selection of final alternative and routing, Garver will work with Owner on the development and execution of a Contract Amendment for Survey services. This will include a proposed plan for the use of sub-consultant work and agreements with Ellington Engineering Services, LLC, and Consolidated Land Services, Inc.

Design

Upon selection of final alternative and routing, Garver will develop Preliminary and Final Design for construction plans, details, and specifications for approval of the Owner and regulatory agencies.

Bidding

Upon completion of Final Design for construction plans, details, and specifications, Garver will provide Bidding Services for the project. This will include advertisement for bids, evaluation of bids, and a recommendation of award. Additionally, this will include pre-bid and bid meetings as required.

Task 6 – Construction Services

Upon selection of a successful bidder, Garver will assist the Owner for Construction Administration and Observation services as required and requested by the Owner.

Project 21WW01384 will cost the city a lump sum of $50,000.

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