WWTP_Expansion_-_Scope_of_Services_.pdf

Scope of Services

Conroe Central Wastewater Treatment Plant Expansion (Expansion from 6.0 MGD to 12.0 MGD Permitted Average Daily Flow Capacity)

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1. Project Background

The City of Conroe is requesting Statements of Qualifications from qualified engineering firms to provide professional engineering and related services for the expansion of the Conroe

Central Wastewater Treatment Plant (WWTP) located at 1890 Ed Kharbat Drive, Conroe, TX

77301.

The existing Conroe Central WWTP has a permitted Average Daily Flow (ADF) capacity of

6.0 million gallons per day (MGD). Wastewater flow projections developed as part of the City's wastewater master planning efforts demonstrate the need for additional treatment capacity to accommodate existing and projected wastewater flows associated with continued growth and development within the City's service area.

The proposed project will expand the Conroe Central WWTP from its existing 6.0 MGD permitted ADF capacity to approximately 12.0 MGD permitted ADF capacity. The project is anticipated to include evaluation, planning, design, permitting, bidding, construction-phase services, and other professional services necessary to provide a complete and operational expansion of the facility.

2. Project Objectives

The primary objectives of the project include:

1) Increase the permitted ADF treatment capacity of the Conroe Central WWTP from 6.0

MGD to approximately 12.0 MGD.

2) Provide sufficient wastewater treatment capacity to accommodate projected flows identified through the City's wastewater master planning efforts.

3) Evaluate existing facilities and determine which components may be incorporated into, modified for, or replaced as part of the expansion.

4) Develop improvements that meet applicable current and anticipated regulatory requirements.

5) Provide reliable, efficient, maintainable, and cost-effective wastewater treatment facilities.

6) Evaluate opportunities to phase improvements, where appropriate, while maintaining continuous plant operations.

7) Minimize impacts to existing wastewater treatment operations throughout construction.

8) Develop an expansion that accommodates the City's anticipated long-term wastewater treatment needs and provides flexibility for future improvements.

3. Scope of Professional Services

The selected firm may be requested to provide some or all of the following services. The final scope and associated fees will be negotiated with the selected firm in accordance with applicable professional services procurement requirements.

(Expansion from 6.0 MGD to 12.0 MGD Permitted Average Daily Flow Capacity)

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A. Existing Facility Evaluation and Data Review

1) Review available master plans, wastewater flow projections, record drawings, previous engineering reports, permits, operational data, regulatory correspondence, and other relevant documentation.

2) Evaluate the existing WWTP facilities, treatment processes, equipment, structures, utilities, and site conditions.

3) Assess the condition, remaining useful life, capacity, and suitability of existing facilities for incorporation into the proposed expansion.

4) Review existing influent flow and loading data and compare actual conditions with projected future flows and loads.

5) Identify existing hydraulic, treatment process, electrical, structural, mechanical, operational, or site constraints that may affect the proposed expansion.

6) Coordinate with City staff and plant operations personnel to identify operational concerns and desired improvements.

B. Preliminary Engineering and Alternatives Analysis

1) Confirm the design criteria necessary to expand the facility to approximately 12.0

MGD permitted ADF capacity.

2) Establish anticipated influent characteristics, hydraulic loading, organic loading, peak flows, and other applicable design parameters.

3) Evaluate alternatives for expansion and modification of existing treatment processes and supporting infrastructure.

4) Evaluate treatment technologies and alternatives based on capital cost, lifecycle cost, reliability, operational requirements, energy consumption, maintenance requirements, regulatory compliance, constructability, and future expansion capabilities.

5) Evaluate opportunities to reuse or rehabilitate existing structures and equipment where practical and cost-effective.

6) Develop conceptual layouts and process flow diagrams for recommended improvements.

7) Evaluate site constraints, access, drainage, utilities, floodplain considerations, easements, and property requirements.

8) Evaluate construction sequencing and phasing necessary to maintain treatment operations and regulatory compliance during construction.

9) Prepare preliminary opinions of probable construction cost and anticipated project schedules for evaluated alternatives.

10) Recommend a preferred alternative for advancement into final design.

11) Prepare a Preliminary Engineering Report or similar technical memorandum documenting findings and recommendations.

12) Evaluate Influent pumping and conveyance facilities;

13) Evaluate Headworks and preliminary treatment;

14) Evaluate Screening and grit removal;

15) Evaluate Flow measurement and distribution;

16) Evaluate Sludge and solids handling, treatment, storage, and disposal facilities;

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17) Evaluate Chemical feed and storage systems;

18) Evaluate Odor control systems if needed;

19) Evaluate Process piping and valves;

20) Evaluate Electrical power distribution;

21) Evaluate Standby/emergency power systems;

C. Treatment Process and Facility Design

The selected firm shall provide engineering services necessary for the design of the recommended improvements. Improvements may include, but are not limited to:

1) Biological treatment systems;

2) Aeration systems;

3) Secondary clarification;

4) Tertiary or advanced treatment, if required;

5) Disinfection systems;

6) Plant water and utility systems;

7) Instrumentation, controls, SCADA, and communications;

8) Structural improvements;

9) HVAC, plumbing, and mechanical systems;

10) Site civil improvements;

11) Other improvements necessary for a complete and operational wastewater treatment facility expansion.

D. Hydraulic and Process Modeling

1) Perform hydraulic evaluations necessary to confirm the capacity of existing and proposed treatment facilities.

2) Evaluate hydraulic profiles through the plant under average, peak, and other applicable design flow conditions.

3) Perform wastewater treatment process modeling, where appropriate, to establish design requirements and evaluate treatment performance.

4) Identify potential bottlenecks within existing facilities and incorporate necessary improvements into the project.

E. Surveying, Geotechnical, Environmental, and Other Technical Services

Provide or coordinate supporting technical services necessary for the project, which may include:

1) Topographic surveying

2) Subsurface utility engineering and coordination with power company;

3) Geotechnical investigations;

4) Other specialized technical services as necessary to support design and construction.

F. Regulatory Coordination and Permitting

(Expansion from 6.0 MGD to 12.0 MGD Permitted Average Daily Flow Capacity)

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1) Coordinate with the Texas Commission on Environmental Quality (TCEQ) and other applicable regulatory agencies.

2) Assist the City with amendments or modifications to the wastewater discharge permit necessary to increase the permitted treatment capacity.

3) Prepare and submit engineering reports, plans, specifications, permit applications, and supporting documentation required by regulatory agencies.

4) Respond to regulatory review comments and coordinate revisions necessary to obtain approvals.

5) Identify applicable federal, state, and local permitting requirements and assist the City in obtaining required approvals.

G. Final Design and Construction Documents

1) Prepare plans, specifications, technical requirements, and other construction documents for the proposed improvements.

2) Develop design submittals at appropriate milestones for City review.

3) Conduct design review meetings with City staff and incorporate approved comments.

4) Prepare updated opinions of probable construction cost at appropriate design milestones.

5) Prepare construction phasing and sequencing requirements to maintain continuous wastewater treatment operations.

6) Develop anticipated construction schedules and identify critical project milestones.

7) Coordinate design requirements with existing and planned City infrastructure.

H. Bidding and Procurement Assistance

The selected firm may be requested to:

1) Assist the City in preparing the project for competitive bidding.

2) Attend pre-bid meeting (min. 1 hr.) and site visit.

3) Respond to bidder questions and/or Requests for Information.

4) Prepare technical addenda and clarifications.

5) Review bids for technical compliance.

6) Assist the City with evaluation of bids and preparation of an award recommendation.

I. Construction-Phase Engineering Services

Construction-phase services may include:

1) City’s Construction Manager/Project Manager will conduct the pre-construction meeting. Engineer shall attend preconstruction meeting (min. 1-hr) and discuss the technical details, as necessary.

2) Review shop drawings, submittals, and product data;

3) Provide responses to Requests for Information (RFI), including engineering interpretations and clarifications;

4) Review proposed substitutions, if applicable;

5) Conducting periodic construction observations;

6) Attend progress meetings;

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7) Reviewing proposed change orders;

8) Assist with startup and commissioning activities;

9) Assisting with equipment testing and performance verification;

10) Attend substantial and final completion inspections; Prepare punch lists;

11) Reviewing operations & maintenance (O&M) manuals and Reviewing record drawings;

and

12) Assist the City through final project acceptance.

The City may also request resident project representative or construction inspection services as part of the project.

J. Startup, Commissioning, and Operational Assistance

1) Develop and coordinate a startup and commissioning plan for new and modified facilities.

2) Coordinate equipment and process testing.

3) Assist City operations staff during facility startup.

4) Coordinate manufacturer training for City personnel.

5) Verify that treatment processes and equipment are operating in accordance with design requirements.

6) Assist with process optimization following startup, as required.

4. Project Phasing and Continuous Operations

The Conroe Central WWTP must remain operational throughout the expansion. The selected firm shall place significant emphasis on constructability, sequencing, temporary facilities, bypass requirements, tie-ins, and operational coordination to minimize disruptions to existing treatment processes.

The design shall include appropriate phasing requirements to allow the City to maintain required treatment capacity and regulatory compliance throughout construction.

5. Future Expansion Considerations

Although the immediate objective is to increase permitted ADF capacity from 6.0 MGD to approximately 12.0 MGD, the selected firm shall consider the City's long-term wastewater needs when developing the facility layout and recommended improvements.

Where practical, the design should preserve opportunities for future treatment capacity expansion and avoid improvements that unnecessarily restrict future development of the

WWTP site.

6. Project Deliverables

Anticipated deliverables may include, but are not limited to:

1) Existing facility assessment;

2) Design criteria and flow/loading analysis;

3) Alternatives evaluation;

4) Preliminary Engineering Report;

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5) Conceptual facility layouts;

6) Process flow diagrams and hydraulic profiles;

7) Opinions of probable construction cost;

8) Project schedules;

9) Regulatory and permitting documentation;

10) Design milestone submittals;

11) Final plans and technical specifications;

12) Bid documents and addenda;

13) Construction-phase documentation;

14) Startup and commissioning documentation;

15) Record drawings; and

16) Final project closeout documentation.

7. Coordination with the City

The selected firm will work closely with City staff, wastewater treatment plant personnel, Purchasing, and other City departments throughout the project. The consultant shall participate in coordination meetings, design review meetings, regulatory meetings, public or Council presentations when requested, and other meetings necessary for successful completion of the project.

8. Additional Services

The City may negotiate additional professional services with the selected firm that are reasonably related to the wastewater treatment plant expansion. Specific tasks, schedules, deliverables, and fees will be established during scope and fee negotiations.

The City reserves the right to perform certain services with City staff or through separate consultants or contractors as determined to be in the City's best interest.