Loading...
HomeMy WebLinkAboutScope of Services-Rexburg FPS rev finalPage 1 of 3 November 20, 2019 Rexburg Wastewater Treatment Plant FPS Page 1 SCOPE OF WORK FOR CITY OF REXBURG WASTEWATER TREATMENT PLANT FACILITIES PLANNING STUDY PROJECT Facilities Planning Study (FPS) for the City of Rexburg Wastewater Treatment Plant (WWTP). PURPOSE This project will provide the City with a FPS for the WWTP. The primary goals of the plan are to: 1. Determine the existing capacity and condition of each treatment plant process a. Determine hydraulic and load capacity for each unit process b. Assess the performance and efficiency of systems and equipment c. Analyze the mechanical and structural condition of the process components 2. Recommend updated operating parameters for each treatment process 3. Evaluate recent treatment plant testing regarding significant industrial users 4. Evaluate influent flow projections 5. Evaluate the new discharge permit with Idaho DEQ and determine anticipated discharge limits for the planning period 6. Provide a new standalone FPS with project recommendations for the next 20-years a. Analyze the cost/benefit of potential improvements 7. Provide design, construction administration, and other related engineering services as requested by the City. BACKGROUND The City owns and operates a wastewater treatment plant, which receives and treats wastewater from Rexburg, Sugar City, and Teton. Other FPS’s have been completed in the past with the latest occurring in 2008. The current liquid stream processes at the WWTP include screening, grit removal, a biotower, oxidation ditches, secondary clarifiers, and UV disinfection. The current solids stream processes include a holding tank, gravity belt thickeners, thickened waste activated sludge (WAS) storage tank, pasteurization system, anaerobic digester, dewatering, and drying beds. Updated NPDES limits for the discharge may arise when DEQ releases a new discharge permit that is expected in the next few months. This permit may drive future upgrades to the WWTP. This FPS will review the existing capacity and conditions of each treatment process; review future influent projections and significant industrial users; evaluate the new DEQ discharge permit; recommend updated operating parameters; and provide a new standalone FPS with recommended improvements that will allow the treatment plant to meet permit limits. SCOPE OF SERVICES Consultant will provide engineering services to complete a FPS for the treatment plant facilities. The study will be completed in accordance with the State of Idaho Department of Environmental Quality (DEQ) guidance for facilities planning. The scope of services are organized by tasks identified in the DEQ FPS guidance outline. Page 2 of 3 November 20, 2019 Rexburg Wastewater Treatment Plant FPS Page 2 The specific tasks of the project are as described below. TASK 1 – PROJECT MANAGEMENT 1.1 Project Coordination/Invoicing 1.2 Project Meetings as needed (prepare agendas and document minutes) 1.3 Progress Reports TASK 2 – WASTEWATER TREATMENT PLANT FPS 2.1 Review Planning Information 2.1.1 Define project need, and review planning area 2.1.2 Review demographics population projections that have been previously determined for the WW Collection System FPS prepared by others 2.1.3 Review and update wastewater flows, current and projected 2.1.3.1 The flow analysis will include a breakdown of the total occupied capacity - split amongst the contributors (Rexburg, Sugar City, Teton, significant industrial users, and obligated) with an available balance. 2.1.3.2 Review and evaluate the effect of septage dumpers at the plant. 2.1.3.3 Review if any dischargers should be listed as Significant Industrial Users (SIU’s) 2.1.4 Review and update wastewater quality data (additional sampling and testing will be performed by the City, including any rental of equipment) 2.1.5 Evaluate new discharge permit 2.1.5.1 Determine effluent limits 2.1.6 Define design criteria for future conditions 2.2 Evaluate Existing Treatment System 2.2.1 Review existing performance data 2.2.2 Review capacity of each process (hydraulic and biological loading) 2.2.2.1 Review of Idaho DEQ redundancy requirements 2.2.3 Identify data gaps and recommend testing locations and frequencies (additional sampling and testing will be performed by the City, including any rental of equipment) 2.2.4 Review current Idaho DEQ rules applicable to plant and identify areas of non-compliance 2.2.5 Visit site to review condition of treatment system components 2.2.6 Evaluate and recommend effluent limits for SIU’s 2.3 Develop Alternatives for Treatment System Upgrades based on current and future flow conditions with the forthcoming NPDES permit requirements. Alternative to be developed include: 2.3.1 No action alternative 2.3.2 Headworks upgrades 2.3.3 Secondary treatment upgrades 2.3.4 Disinfection upgrades 2.3.5 Biosolids Treatment upgrades 2.3.6 Other upgrades as determined (i.e. primary treatment upgrades) 2.4 Evaluate Alternatives and Select Preferred Alternative 2.4.1 Evaluate and compare alternatives for non-financial factors, including complexity, reliability, energy requirements, implementability, operations, environmental evaluation, and views of the public and concerned interest groups. Page 3 of 3 November 20, 2019 Rexburg Wastewater Treatment Plant FPS Page 3 2.4.2 Evaluate and compare alternatives for financial factors, including monetary costs including life cycle costs, reserve capacity, demonstration of financial capability, and capital financing plan. 2.4.3 Select preferred alternative for implementation. The preferred alternative will include a list of corrective actions for each of the system deficiencies identified. This list will be organized into a capital project implementation plan. If administrative or system maintenance projects are identified, these items will also be organized into an implementation schedule. 2.5 Develop Preferred Alternative Implementation Plan, including: 2.5.1 Costs and funding alternatives 2.5.2 Schedule 2.5.3 Financial feasibility review that includes a recommendation for user rates 2.5.4 Implementation phasing and schedule that includes the estimated year, population, and flow when the improvement will be needed 2.6 Provide Draft Report, Conduct Review Meeting, and Incorporate Comments 2.7 Provide Final Report (4 paper copies plus a searchable pdf file) 2.8 Coordinate DEQ Review TASK 3– ADDITIONAL SERVICES 3.1 Perform Basic Environmental Analysis 3.1.1 Review environmental information for preferred alternative (such as environmental information, historical and archaeological sites, floodplains and wetlands, agricultural lands, wild and scenic rivers, fish and wildlife protection, air quality, water quality and quantity) to determine if further detailed environmental review is required. It is anticipated to complete the necessary effort for a determination of “Categorical Exclusion.” 3.1.2 In the event that a determination of “Categorical Exclusion” is inadequate for the Preferred Alternative, and either a “Finding of No Significant Impact” (FONSI) or an Environmental Information Document (EID) is required. The effort to complete the necessary document will be negotiated at that time. 3.2 Provide design of WWTP improvements, construction administration, and other related engineering services as requested by the City. 3.3 Funding Assistance 3.3.1 Coordinate Wastewater Treatment FPS Funding by summarizing potential funding sources and strategies based on the preferred alternative and implementation schedule 3.3.2 Coordinate Wastewater Collection System FPS Funding by summarizing potential funding sources and strategies based on the preferred alternative and implementation schedule 3.4 Treatment Plant modelling and training. BUDGET The budget for this scope of work is attached. SCHEDULE The basic schedule for each task is attached. The dates listed are approximate dates, and are subject to change.