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HomeMy WebLinkAbout2005-339 1 Ca • ., ta ° ✓� • WORK ORDER NUMBER 2 os This Work Order Number 2 is entered into as of this 4th day of October , 2005 pursuant to that certain Continuing Contract Agreement for Professional Services entered into as of March 16 , 2004 ( "Agreement" ) , by and between Indian River County , a political subdivision of the State of Florida ( "COUNTY" ) and Brown and Caldwell ( " CONSULTANT" ) . The COUNTY has selected the Consultant to perform the professional services set forth on Attachment 1 , attached to this Work Order and made part hereof by this reference . The professional services will be performed by the Consultant for the fee schedule set forth in Attachment 2 , attached to this Work Order and made a part hereof by this reference . The Consultant will perform the professional services within the timeframe more particularly set forth in Attachment 3 , attached to this Work Order and made a part hereof by this reference all in accordance with the terms and provisions set forth in the Agreement . Pursuant to paragraph 1 . 4 of the Agreement , nothing contained in any Work Order shall conflict with the terms of the Agreement and the terms of the Agreement shall be deemed to be incorporated in each individual Work Order as if fully set forth herein . IN WITNESS WHEREOF , the parties hereto have executed this Work Order as of the date first written above . BOARD OF COUNTY COMMISSIONERS BROWN AND CALDWELL OF INDIAN RIVER COUNTY B By S� Harold E . Schmof , Jr. , P . E . Thomas S . Lowther, Chairman Title : Vice President Attest: J . K . Barton , C1 of„CQurt By Deputy Clerk Approved : Joseph . aird , County Administrator Zan ed as to form and legal sufficie y : E . Fell , Assists o my orney EXHIBIT A SCOPE OF SERVICES PRELIMINARY ENGINEERING REPORT FOR EXPANSION AND UPGRADE OF THE NORTH REGIONAL WWTF INDIAN RIVER COUNTY, FLORIDA Background Indian River County owns and operates four wastewater treatment facilities (WWTFs) , identified as the Central, North, South and West Regional WWTFs . In 2000, the North Regional WWTF was taken out of service to take advantage of unused capacity at the Central Regional WWTF . Since that time, wastewater flows conveyed to the North Regional WWTF have been pumped to the Central Regional WWTF for treatment and disposal. Over the past few years, however, Indian River County has experienced a significant increase in construction permits and development applications, suggesting that the Central Regional WWTF may soon not have the capacity available to accommodate wastewater flows generated in the North Regional WWTF service area. Accordingly, Indian River County has plans to upgrade and expand the North Regional WWTF and place the plant back into operation. The existing North Regional WWTF has a permitted annual average daily flow (AADF) capacity of 0 . 85 million gallons per day (mgd) , although County operations personnel report that unit processes at the plant may be hydraulically limited. Unit processes at the facility include screening and grit removal, flow equalization, an oxidation ditch with a " boat" type internal clarifier, a traveling bridge filter and a chlorine contact chamber. There is also a small septage receiving station located at the plant. Effluent disposal, when the facility was in operation, was by irrigation at the Sand Ridge Golf Course . There is no permitted surface water discharge from the plant. Residual solids that are wasted from the biological treatment process are pumped to a sludge holding tank and periodically hauled to the Central Regional WWTF for processing. Based on a preliminary inspection, the physical condition of the North Regional WWTF is below average, due in large part to several years of inactivity. In 2004, Post, Buckley, Schuh & Jernigan, Inc . (PBS&J) completed an update to the County's water and wastewater master plan. In a recent amendment to that master plan update, PBS&J recommended that the County bring the North Regional WWTF back on line, and increase its AADF capacity from 0 . 85 mgd to 2 mgd. Based on the PBS&J projections , this additional capacity at the North Regional WWTF should be sufficient through the year 2015 , when a subsequent expansion to 4 mgd will be needed. The objective of this project is to identify the improvements needed to provide the required capacity at the North Regional WWTF and to provide the permitting and design services necessary for their construction . The initial phase of the project will be to develop a Preliminary Engineering Report (PER) that will provide Indian River County with a site master plan and the basis of design for initial and subsequent future improvements at the S: \ 041077\ IRC North Regional WWTF Expansion\ Exhibit A_revl .doc North Regional WWTF . Wet weather storage options will also be evaluated . The PER will provide the basis for permitting of initial improvements by the Florida Department of Environmental Protection (FDEP) . Subsequent phases of work will include detailed design, assistance during bidding and construction phase services . Because it is not yet possible to define the initial improvements that will be designed as part of this project, this Scope of Services only includes that work associated with preparation of the PER and an application for a construction permit from the FDEP . After the PER has been completed and a construction permit has been approved, a scope of services , budget and completion schedule for design of the recommended improvements will be negotiated with Indian River County. The following task descriptions summarize the work activities to be performed by Brown and Caldwell (BC) during the PER and permitting phase of the project. Task 1 - Project Management Project management includes contract administration and project review meetings with Indian River County staff. Subtask 1. 1 — Contract Administration. Prepare a Project Management Plan and negotiate subconsultant agreements . Monitor the progress of work by all members of the BC Team on a regular basis to assure compliance with the established schedule and budget. Review and process subconsultant invoices and documentation of services completed. Prepare monthly summaries of work completed to accompany BC invoices to Indian River County for periodic payment. Subtask 1. 2 — Project Review Meetings . Prepare for and attend periodic project status meetings with Indian River County staff to review the progress of work on the project. The first meeting will be a project kick-off meeting and will be held prior to the initiation of work. Subsequent meetings will be held at approximately monthly intervals thereafter. The meetings will be attended by the BC project manager, as well as other members of the BC Team as may be appropriate for the issues to be discussed. A total of six project review meetings have been assumed for budgeting purposes as follows : Meeting 1 : Project kick-off meeting Meeting 2 : Project status update ; presentation of site master plan concepts Meeting 3 : Project status update; presentation of recommended site master plan and initial plant improvements Meeting 4: Project status update; presentation of 90 percent PER and draft FDEP permit application Meeting 5 : Project status update ; review of County comments on 90 percent PER and draft FDEP permit application Meeting 6 : Project status update ; review of FDEP comments on permit application All project review meetings will be conducted at the Indian River County Administration Building unless otherwise directed by Indian River County staff. BC will prepare meeting summaries following each meeting and distribute them to all attendees . S: \041077\ IRC North Regional WWl'F Expansion\Exhibit A revl . doe Task 2 — Facility Inspection and Data Review This task involves the review of existing information about the North Regional WWTF, including its current condition, for use in establishing alternative concepts for its upgrading and expansion . Subtask 2 . 1 — Existing Plant Condition Assessment. Conduct a thorough inspection of the existing North Regional WWTF focusing on the condition of existing structures and equipment. The objective of the inspection will be to identify those facilities which are in good enough condition to remain if they can be incorporated into the North Regional WWTF expansion design at reasonable cost. Subtask 2. 2 - Data Compilation and Review. Review existing data and information available from Indian River County regarding the North Regional WWTF site . This information is likely to include, but is not necessarily limited to, the following: • Legal description and boundary survey of the North Regional WWTF site and adjoining land owned by Indian River County that could be used for North Regional WWTF expansion. • Copies of previous reports, permit applications , design documents , record drawings , and other information relevant to prior work at the North Regional WWTF . • Operating data for the North Regional WWTF prior to its being taken off-line in 2000, including records regarding the disposal of treated effluent, if available. • Any additional site operating data, such as water levels in groundwater monitoring wells, which may have been collected on an on-going basis after the North Regional WWTF was taken off-line in 2000 . In addition, Indian River County will be collecting current influent flow and water quality data at the North Regional WWTF for a period of at least 30 days in support of this project. BC will review this data and use it to perform hydraulic modeling and modeling of alternative treatment process designs during preparation of the PER in Task 5 . Task 3 — Surveying Support Services The original boundary and topographic survey of the North Regional WWTF site was performed in support of the 1988 design of the plant. In 2000 , an updated topographic survey of a significant portion of the existing site was completed by Carter & Associates during design of the pumping station and transmission main improvements at the plant. This data is assumed to still be valid since no additional work at the plant has been done since that time . However, additional topographic data on adjacent land and other survey information on and around the existing plant site will be needed for the PER and the subsequent detailed design phase of the project. S: \ 041077\ IRC North Regional WWTF Expansion\ Exh bit A_revl .doc The land to be surveyed as part of this project includes about 19 acres of County- owned property extending north of the existing North Regional WWTF to the County' s property line with the Red Stick Golf course and extending west of the North Regional WWTF to a large lake which separates the plant site from other County facilities further to the west. The surveying activities to be performed under this task include the following: • A boundary survey of the expansion site • A topographic survey of the expansion site • A tree survey to locate all single trees 4 inches in diameter and larger and to identify the locations and types of tree clusters throughout the expansion site . • A vegetation survey along the shoreline of the lake to determine the limits and types of existing vegetation for wetlands delineation purposes • Elevations of lake and pond levels • Elevations of top of ground and top of casing at monitoring wells and piezometers • Elevations of above-grade basins , slabs , piping, weirs, and other unit processes at the existing North WWTP for possible hydraulic or process modeling purposes All survey data will be presented in digital files and on maps of the site that will be included with the PER. It is assumed that Indian River County will provide the necessary title or legal description of the land to be surveyed and any associated documents relevant to the work of this project. Task 4 — Subsurface Site Investigations Perform subsurface investigations to define on-site wet weather disposal capacity and to generally define structural foundation requirements on the expansion area of the site . The investigations will include the installation of piezometers and borings , laboratory analyses, groundwater modeling and engineering evaluations to identify on-site wet weather disposal capacity and to define preliminary geotechnical design requirments . A summary of the work activities to be performed include the following: • Perform six SPT soil borings , two to a depth of 100 feet and four to a depth of 25 feet. • Install and develop approximately 200 vertical feet of piezometers throughout the expansion site . Perform field permeability tests in all new piezometers . • Analyze soil samples collected from SPT borings for gradation, porosity and other parameters required for groundwater modeling and geotechnical engineering evaluations . • Develop a groundwater flow model for the North Regional WWTF site and surrounding area to define the available wet weather disposal capacity on the plant expansion site . Simulate up to three hydraulic loading scenarios , including the background (zero loading) scenario . The results of the work will be summarized in a subsurface investigation report that will be submitted to Indian River County as a stand-alone document and incorporated into the S: \ 041077\ IRC North Regional WWFI ' Expansion\ Exhibit A_revl .doc PER. The subsurface investigation report will also be used as supporting documentation for the permit application to FDEP to be prepared and submitted in Task 5 . Should off- site improvements for effluent disposal be required, any additional subsurface investigations needed to develop a basis of design for these facilities will be performed as a supplemental service under an amendment to this Scope of Services . Task 5 - Preliminary Engineering Report In this task, a PER will be prepared addressing the wastewater treatment facility permitting requirements of Chapters 62- 604 and 62-620, Florida Administrative Code (FAC) . The PER will provide a master plan for build-out of the North Regional WWTF site over the long- term as well as recommendations for plant expansion to an AADF of 2 mgd in the short- term, consistent with the build-out plan. The PER will be based upon population and wastewater generation projections for the North Regional WWTF service area contained in the most recent update to Indian River County's Water and Wastewater Master Plan . The following work activities will be performed during preparation of the PER: Subtask 5 . 1 — Wastewater Process Design. Using current influent flows and loads to the North WWTP, a wastewater process model using BioWin0 will be developed. The BioWin® model will be used to size process units to achieve the County's treatment objectives at the North Regional WWTF both now and in the future . The facility will be designed to meet Class I reliability requirements and to produce an effluent that meets standards for public access reuse . Surface water discharge is not an option at the North Regional WWTF at this time . Residuals management will consist of aerated sludge holding, thickening and hauling to the County' s Central Regional WWTF for treatment. Subtask 5 . 2 — Site Master Plan. Based upon projections of future wastewater generation in the North Regional WWTF service area, an estimate of the capacity of the North Regional WWTF at build-out will be made . A site master plan will then be prepared for providing the required build-out capacity. The site master plan will take into account site buffers , land area requirements for on- site effluent storage and disposal, phased expansion of the North Regional WWTF in modular process trains , flexibility to modify treatment processes to achieve lower effluent limits , and County preferences for on- site administrative, operation and maintenance support facilities. The site master plan will also take into account the County's long-term objective of developing a pressurized public access reclaimed water reuse system and the plant modifications that could result from implementing such a system. Initial improvements at the North Regional WWTF to increase AADF capacity to 2 mgd will be consistent with the recommended long-term plan for build-out of the site . Initial improvements will be configured and sized to facilitate future expansions and upgrades . If possible , sufficient additional wet weather disposal capacity to support a 2-mgd plant will be provided on-site to avoid a costly effluent transmission system in the short-term. S: \041077\ IRC North Regional VAMF Expansion\Exhibit A_revl .doc In preparing the site master plan and strategy for initial plant improvements, up to three alternative concepts will be developed for consideration by Indian River County. These alternative concepts will be presented at a project review meeting (Task 1 ) to allow input from County staff. Following this input, the alternative concepts will be evaluated and a recommended approach presented to County staff at a subsequent project review meeting. Subtask 5 .3 — Preliminary Design of Initial Plant Improvements . Perform preliminary design of the recommended improvements to increase AADF capacity at the North Regional WWTF to 2 mgd. This will include additional B1oWiri modeling for process design, hydraulic modeling through the various unit processes to create a hydraulic profile, and other calculations to determine sizing of structures and mechanical equipment such as blowers, piping and pumps . For all unit processes, prepare a detailed basis of design, defining the design criteria to be applied during detailed design . Also define applicable regulations and codes affecting the basis of design . Subtask 5 .4 — Preliminary Engineering Report. Prepare a PER summarizing the work performed in Tasks 2 through 4 and Subtasks 5 . 1 through 5 . 3 above . The PER will consist of the following: 1 . Population and land use projections for the North Regional WWTF wastewater service area . 2 . Wastewater flow projections and characteristics . 3 . Summary of the process design including: a . Design criteria. b . Expected dimensions of unit operations and processes , capacities and volumes . C, Process configurations . d. Hydraulic profile through the plant. e . Organic and solids loadings to each unit process . f. Process flow schematics and instrumentation diagrams . 4. Technical information and design criteria for treatment facilities , including: a . Hydraulic and organic loadings - minimum, average, and maximum for each liquid and solids treatment process . b . Provision for flow metering and sampling throughout the plant. c . Recycle flows within the plant. d. Chemical addition facilities , including disinfection . e . Summary of treatment performance for each unit process with supporting data or design calculations . f. Documentation supporting chlorine doses and residuals and contact times used as the basis of design , if chlorine is used for disinfection . 5 . Site plan illustrating proposed facilities and unit processes; 100-year and 25 -year flood elevations ; approximate finish elevations for all major treatment units and pumping stations ; and a stormwater management plan . S: A047077\ IRC North Regional WWIT Expansion\Exhibit A_revl .doc 6 . Preliminary structure layouts . 7 . Plant electrical loads and power consumption. 8 . Residual solids management, including options for odor control. 9 . Facilities for on-site wet weather storage and disposal of treated effluent. 10 . Operation and control strategies included for prevention of upsets, alternate disposal methods , and reliability classification and features . 11 . An assessment of environmental effects of the project, including odor and noise control, public accessibility, proximity to existing and proposed residential areas , flood protection, lighting, and aerosol drift. 12 . Preliminary opinion of capital cost 13 . Preliminary project completion schedule . Five copies of the draft PER will be submitted to Indian River County for review at the 90- percent complete stage . Following receipt of review comments , ten signed and sealed hard copies and one electronic copy (compact disc) of the final PER document will be submitted to the County. The final PER document will be submitted to FDEP in support of the permit application for expansion and upgrading of the North Regional WWTF . Task 6 . 0 — FDEP Permitting Assistance This task involves coordination with the FDEP during preparation of the PER and obtaining a construction permit for initial improvements at the North Regional WWTF based on the recommendations of the PER. Subtask 6. 1 — Pre-Application Meetings with FDEP Staff. Two pre-application meetings will be scheduled with FDEP staff during preparation of the PER as follows : 1 . The first meeting will occur early in the project after alternatives for plant improvements have been identified. The purpose of this meeting will be to familiarize the FDEP staff with objectives of the project, the proposed schedule and the preliminary improvements that will be considered for incorporation into the project. 2 . The second meeting will occur after the County has reviewed the 90 percent complete PER and recommendations for plant improvements have been finalized . The purpose of this meeting will be to present the recommended improvements to FDEP staff to obtain any regulatory input that could facilitate review and approval of the County' s permit application . It is assumed that meetings with FDEP staff will be held at the Central District Office in Orlando . S: \041077\ IRC; North Regional WWTF Expansion\ Exhibit A_revl .doc Subtask 6 .2 — Draft FDEP Permit Application. In conjunction with the 90 -percent PER review, a draft permit application on FDEP Forms 62 - 610 . 910 (1 ) and 62 - 620-910 (2) will be prepared and submitted to Indian River County for review and comment. Following County review, the permit forms will be revised to address comments and finalized for signature . Ten copies of the final permit application forms , signed and sealed by the Engineer of Record will be submitted . Indian River County will be responsible for payment of all applicable permit fees . Subtask 6 .3 — Responses to Requests for Additional Information. Brown and Caldwell will prepare responses to Requests for Additional Information (RAIs) from FDEP as required. Because we will be discussing planned treatment plant improvements, our groundwater modeling program, and our plan for wet weather storage and disposal with FDEP at pre-application meetings, it is anticipated that only RAI letter will be received from FDEP before the permit application is considered complete and approved. For budgeting purposes, it has been assumed that a total of 60 professional labor hours will be required to prepare responses to FDEP comments . This budget assumption is intended to cover reasonable requests for clarification of the information presented in the permit application and does not take into account any requests that require additional field work, remodeling of treatment processes, or extensive remodeling of groundwater for wet weather storage and disposal. S: \041077\ IRC North Regional WWI'F Expansion\ Exhibit A_recl . doc EXHIBIT B PROJECT BUDGET PRELIMINARY ENGINEERING REPORT FOR EXPANSION AND UPGRADE OF THE NORTH REGIONAL WWTF INDIAN RIVER COUNTY, FLORIDA Brown and Caldwell proposes to provide the services described in Exhibit A for the lump sum amount of $204, 339 . An approximate breakdown of the anticipated labor hours and direct expenses, by task, is provided in the tables on the following pages . S :\041077\IRC North Regional WWTF Expansion\Exhibit B_revl .doc COST ESTIMATE PRELIMINARY ENGINEERING REPORT FOR EXPANSION AND UPGRADE OF THE NORTH REGIONAL WWTF INDIAN RIVER COUNTY, FLORIDA BROWN AND CALDWELL - LABOR Executive Managing Supervising Senior Engineer Engineer Technical/ Clerical/ Total Total TASKS En ineer Engineer Engineer Engineer III II CADD Admin Hours Cost Gr tl LeM M L J/K H/I G F E D Bi - Rab W 195.00 180.00 150.00 130.00 105.00 85.00 80.00 60.00 Task 1 — PROJECT MANAGEMENT Subtask 1 . 1 Contract Administration 8 40 40 88 $ 9,040 Subtask 1 .2 Project Review Meetings 8 8 48 8 16 24 112 $ 12,880 Task 1 Subtotal 8 16 0 88 8 16 0 64 200 $ 21 ,920 Task 2 — FACILITY INSPECTION AND DATA REVIEW Subtask 2. 1 Existing Plant Condition Assessment 8 8 8 4 28 $ 3, 160 Subtask 2.2 Data Compilation and Review 4 4 16 16 4 8 52 $ 5,940 Task 2 Subtotal 4 0 12 24 16 8 4 12 80 $ 9. 100 Task 3 — SURVEYING SUPPORT SERVICES Subtask 3. 1 BC Coordination and Review 2 8 4 8 22 $ 2,200 Task 3 Subtotal 0 2 0 8 0 0 4 8 22 $ 2.200 Task 4 — SUBSURFACE SITE INVESTIGATIONS Subtask 4. 1 BC Coordination and Review 2 2 16 4 8 32 $ 3,630 Task 4 Subtotal 2 2 0 16 0 0 4 8 32 $ 3,630 Task 5 -- PRELIMINARY ENGINEERING REPORT Subtask 5. 1 Wastewater Process Design 8 8 60 20 8 104 $ 11 ,080 Subtask 5.2 Site Master Plan 2 4 24 8 40 24 8 110 $ 10,870 Subtask 5.3 Prelim Design of Initial Improvements 4 8 16 60 8 60 16 16 188 $ 20,600 Subtask 5.4 Preliminary Engineering Report Subtask 5.4. 1 Draft Report 4 4 8 60 20 40 16 40 192 $ 19,680 Subtask 5.4.2 Final Report 2 4 4 16 8 16 8 16 74 $ 7,590 Task 5 Subtotal 20 20 28 168 104 176 64 88 668 $ 69,820 Task 6 — FDEP PERMITTING ASSISTANCE Subtask 6. 1 Pre-Application Meetings with FDEP 8 8 8 8 32 $ 4,520 Subtask 6.2 FDEP Permit Application 2 8 40 8 40 16 16 130 $ 13,510 Subtask 6.3 Responses to RAls from FDEP 2 8 40 4 24 8 16 102 $ 11 ,090 Task 7 Subtotal 12 24 0 88 t2 64 24 40 264 $ 29, 120 Total Labor Hours 46 64 40 392 140 264 t00 220 1 ,266 Total Labor Dollars $ 8 970 $ 11 520 $ 6,000 $ 50 960 $ 14 700 $ 22 440 $ 8 000 $ 13,200 $ 135,790 Total Hours for all Tasks 1266 Total Dollars for all Tasks $135,790 S./041077/IRC North Regional WWTF Expansion\Cost Estimate re l .xls fl/24/2005 COST ESTIMATE PRELIMINARY ENGINEERING REPORT FOR EXPANSION AND UPGRADE OF THE NORTH REGIONAL WWTF INDIAN RIVER COUNTY, FLORIDA BROWN AND CALDWELL - OTHER DIRECT COSTS NO. OF UNIT TOTAL UNIT UNITS COST COST 1 . 0 AIRFARE TRIP 0 500 $0 2. 0 MILEAGE MI . 51000 0. 38 $ 1 , 875 3. 0 LODGING AND MEALS DAY 0 120 . 00 $0 4 . 0 CAR RENTAL DAY 10 60 . 00 $600 5. 0 B/W COPYING AND PRINTING WORK EFFORT PAGE 0 0 . 10 $0 DRAFT REPORTS PAGE 0 0 . 10 $0 FINAL REPORTS PAGE 0 0 . 10 $0 11 x 17 COPIES (TOTAL) PAGE 0 0. 20 $0 B/W COPYING SUBTOTAL $0 6 . 0 OUTSIDE COLOR COPYING DRAFT REPORTS PAGE 200 1 . 00 $200 FINAL REPORTS PAGE 500 1 . 00 $500 COLOR COPYING SUBTOTAL $700 6 . 0 COMMUNICATIONS TELEPHONE WEEK 0 50 . 00 $0 POSTAGE WEEK 0 10. 00 $0 FEDERAL EXPRESS UNIT 4 25. 00 $ 100 FAX PAGE 0 2 . 00 $0 COMMUNICATIONS SUBTOTAL $ 100 7.0 COMPUTER CADD HOUR 0 20 . 00 $0 ENGINEERING HOUR 0 15. 00 $0 WORD PROCESSING HOUR 0 10 . 00 $0 COMPUTER SUBTOTAL $0 8. 0 SUBCONSULTANTS CARTER & ASSOCIATES , INC (SURVEYING ) LS 1 18000 . 00 $ 18, 000 ARDAMAN & ASSOCIATES , INC. (GEOTECH ) LS 1 47274 . 00 $47,274 SUBCONSULTANTS SUBTOTAL $65 ,274 OTHER DIRECT COSTS SUBTOTAL $68 549 MARKUP ON ODCs 0 . 0% $0 TOTAL OTHER DIRECT COSTS $68 549 PROJECT COST SUMMARY ' TOTAL' BILLING LABOR COST - . $ 135,790 TOTAL OTHER DIRECT COSTS $ 082549 TOTAL, PROJECT COST 204 ,339 S :\041077\IRC North Regional WWTF Expansion\Cost Estimates revl . xls EXHIBIT C PROJECT SCHEDULE PRELIMINARY ENGINEERING REPORT FOR EXPANSION AND UPGRADE OF THE NORTH REGIONAL WWTF INDIAN RIVER COUNTY, FLORIDA Proiect Milestone Projected Completion Date Purchase Order Issued September 1 , 2005 Project Kickoff Meeting September 9 , 2005 Facility Inspection and Data Review September 30 , 2005 Complete (Task 2) Site Surveying Work Complete (Task 3 ) October 30, 2005 Subsurface Investigations Complete (Task 4) October 30 , 2005 Site Master Plan and Preliminary Design of November 30 , 2005 Initial Improvements Complete (Task 5 ) Draft Preliminary Engineering Report December 23 , 2005 Complete (Task 5 ) Draft FDEP Permit Application Complete December 23 , 2005 (Task 6) Final Preliminary Engineering Report January 27 , 2006a Complete (Task 5 ) FDEP Permit Application Submitted (Task 6) January 27 , 2006' FDEP Permit Application Approved (Task 6) April 28 , 2006' a Assumes review comments from Indian River County on or before January 16, 2005 b Assumes 90-day permit review and approval process S : \041077\IRC North Regional WWTF Expansion\Exhibit C . doc PBSI June 3 , 2005 Mr. Mike Hotchkiss Indian River County 184025 th St , Vero Beach , FI 32960 RE : Expansion of the West & North Regional WWTFs Indian River County ( IRC) has experienced a significant increase in the amount of new development applications recently . The annual and monthly total number of construction permits issued has also increased over the last few years since the 2003 Utilities Master Plan historical cut off date and the completion of the report in 2004 . As a result of this increased planned growth , the Department of Utility Services is experiencing larger amounts of vested flows and has seen the actual plant flow increase at all the Regional Wastewater Treatment Facilities (WWTF) . West Regional WWTF The West Regional Wastewater Treatment Facility was designed as a 2 . 0 MGD annual average daily flow (AADF) biological nutrient removal , advanced treatment plant. The facility produces an effluent suitable for reclaimed water reuse as unrestricted public access irrigation with alternate wet weather disposal to a 135-acre man-made wetland treatment system adjacent to the plant site , which is located near 1 -95 between 8th Street and 4th Street. The wetland is configured to receive flow from both the West and South Regional WWTFs . The current AADF at the West Regional WWTF and South Regional WWTF are 0 . 97 MGD and 1 . 5 MGD , respectively, as compared to current permitted capacities of 2 . 0 MGD AADF each . However, the West Regional facility has reached a three-month average daily flow (ADF) plus vested flow of 1 . 20 MGD , or approximately 60 percent of the permitted AADF capacity. Likewise , the South Regional WWTF has reached a three-month ADF plus vested flow of approximately 1 . 9 MGD , or approximately 95 percent of the permitted AADF capacity of the facility. The 2004 Master Plan Update ( MP) recommended that approximately 0 . 75 MGD AADF of flow be diverted from the South to the West Regional WWTF to account for vested flow and the growth in the planning horizon while maintaining the County' s goal not to expand the South Regional WWTF , The MP utilized vested flows of 0 . 20 and 0 . 35 MGD AADF for the West and South Regional WWTFs , respectively, which are similar to existing vested flow levels , however, the current backlog of developments and new applications appear to be increasing at a greater rate then the data that was previously available . In order to adjust to those changes and to verify or revise the vision for service in the South and West Service Areas , a preliminary calibration of the County's flow projections and recommended improvements at the WWTFs was conducted by PBSU with input from County staff. The conclusion of this "calibration " is that the West Regional WWTF may reach its design capacity within the next two to three years , assuming diversion of flow from the South Service Area , increasing vested flows and continued growth in the West Service Area (See Figures 1 to 3) . PBSU and IRC staff have identified approximately 2 , 300 and 820 new equivalent residential units ( ERU ) in the West and South Service Areas , respectively , which may come online during the next two years . An estimate of completed subdivisions , individual occupied lots and developed parcels , according to IRC Metropolitan Planning Organization ( MPO) , have already been deducted from this count which results in new flows of approximately 0 . 78 MGD AADF combined for the South and the West Service Areas . The flows generated from the newly identified ERUs are approximately 0 . 57 and 0 . 21 MGD AADF for the West and South , respectively. When combined with an assumed backlog of vested flows of 0 . 20 and 0 . 40 MGD AADF for the West and South Regional WWTFs , respectively , actual flows , and the transfer of 0 . 75 MGD AADF from the South to the West Regional WWTF the potential flows at the West and South Regional WWTFs may be 2 . 52 and 1 . 36 MGD AADF , respectively. The 3 . 88 MGD AADF of potential flow plus vested flow that has been identified between the two facilities is below the combined permitted amount of 4 . 0 MGD AADF , however, the timing and amount of flow diverted from the South Service Area to the West Regional WWTF will be critical in remaining under existing permitted capacities . Since the South and West Service Areas will essentially operate as a combined service area and the treatment capacity of the South Regional WWTF is limited , it is important to consider the impact of any future improvements , developer or IRC driven , on both facilities and the ability to transfer flow to the West Regional WWTF . Future potential flows and percent plant utilization based on our proposed expansion to 6 . 0 MGD AADF is shown in the following table with flow projection methodology provided in the footnotes . Since the flow projections are based on a shorter term methodology, it will be extremely important to monitor the pace of growth and track vested flow versus actual flows seen in IRC 's facilities . The current pace of growth and vested flows based on the new short term data , results in approximately 3 . 0 MGD AADF increase over two to five years which is an extremely high rate of growth based on historical data . If this projected rate of growth were to continue , an expansion to 6 . 0 MGD AADF may not last ten years . This is , however, a conservative approach faced with the development the County is currently experiencing and making the assumption that the growth should begin to return to more moderate pace when the supply of new homes has increased P2 IRC WWTF Expansion May 2005 IRC is in the process of re-rating the South Regional WWTF which has the potential to add 0 . 25 - 0 . 50 MGD AADF of additional treatment to the combined service area , however, our approach does not assume this treatment is available and that the West Regional WWTF improvements will handle all new flows above the South Regional WWTF 's capacity of 2 . 0 MGD AADF . Any additional capacity gained at the South Regional WWTF would benefit the combined service area . Potential Flow Scenarios for the West and South WWTFs ( MGD AADF) Table 1 � Current w/ 0-2 yr before 0-2 yr after Plannin Horizon Current Transfer im rovements4 im rovements 2-5 r 5- 10 r 2 20 r Total Vested Capacity 0 . 60 0 . 60 0 . 60 0 . 60 0 . 60 0 . 60 0 . 60 West WWTF Flow with vested and transfer flows ' 1 . 17 1 . 95 1 . 92 2 . 52 4 . 11 4 . 18 5 . 67 South WWTF Flow with vested and transfer flows ' 1 . 9 1 . 15 1 . 96 1 . 36 1 . 78 1 . 83 1 . 83 West WWTF Capacity 2 2 2 3 6 6 6 South WWTF raaci 2 2 2 2 2 2 2 WWTF % of ci 60 . 0 % 97 . 5% 96 . 0 % 84 . 0% 68 . 5% 69 . 6% 94. 5% WWTF % of C' 95. 0 % 57 . 5% 98. 0 % 68 . 0 % 89. 1 % 91 . 3 % 91 . 3% ' Additional flow based on new subdivisions and ERUs identified in the January 2005 IRC Community Development Report with an estimate of completed subdivisions , individual occupied lots, and developed parcels according to IRC Metropolitan Planning Organization (MPO) deducted from the total number of ERUs. Flow based on IRC 's wastewater level of service of 250 gpd/ERU noted in the March 17 , 1998 IRC 2020 Comprehensive Plan . 2 Flow not necessarily representative as the methodology for flow projections was based on short term data contained in the January 2005 IRC Community Development Report. Longer term planning is in progress based on historical information including new customer connections per month , plant flows , and building permits issued per month . 3 Planning horizon flow assumes flows return to master plan levels and all new flows occur in or are routed to the West Regional WWTF. If the current pace of growth and vested flows continues , the West Regional WWTF may need to be re-rated . It will be extremely important to monitor the pace of growth and the track vested flow versus actual flows seen in IRC's facilities . 4 Plant situation if no improvements are made in 0 to 2 year horizon 3 IRC WWTF Expansion May 2005 The Department of Utility Services , based on the projected flows is requesting the expansion of the West Regional WWTF of 2 . 0 MGD to 6 . 0 MGD AADF with a Maximum Month Capacity of 7 . 8 MGD . The expansion(s) are expected to provide the Department with adequate capacity to meet current and expected growth in the west region through the current planning horizon , based on the information obtained . THIS SPACE INTENTIONALLY LEFT BLANK PRW 4 IRC WWTF Expansion ar May 2005 Wastewater Capacity and Estimated Flow " West Regional WWTF Figure 1 8.00 Treatment Capacity — Demand with Concurrency Demand less Concurrency -- -- —' -- - 6.00 - --r-- -- - - - - - - c a � E 4.00 -- 0 LL � 2.00 —. —_— - —_ Ile 0.00 2000 2005 2010 2015 2020 2025 2030 Years Wastewater Capacity and Estimated Flow - South Regional WWTF Figure 2 4.0 _. . - . - .... .. _ Treatment Capacity Demand with Concurrency Demand less Concurrency v m E c 2.0 0.0 - 2000 2005 2010 2015 2020 2025 2030 Years 5 IRC WWTF Expansion May 2005 Wastewater Capacity and Estimated Flow - West and South Regional WWTFs Figure 3 10.0 Treatment Capacity =i Demand with Concurrency Demand less Concurrency 8.0 6.0 -- v — a E LL 4.0 --.— . 2.0 _ 0.0 2000 2005 2010 2015 2020 2025 2030 Years North Regional WWTF and Central Regional WWTF The North Regional WWTF was designed as a 0 . 85 MGD AADF biological treatment system . The plant includes influent screening , influent equalization , grit removal , an extended aeration biological process train which includes an anoxic basin followed by an oxidation ditch featuring "boat" type internal clarification , traveling bridge filters and a chlorine contact tank . Excess solids are stored in a sludge holding tank. A small septage receiving station is also located at the North Region WWTF . The current effluent disposal for the facility when it is operating is pumped to the Sand Ridge Golf Course where it is used for irrigation . An onsite earthen basin is used for storage of effluent not meeting specification standards . A submersible pump station is located in the pond to return non-spec water to the head of the plant . The North Regional WWTF is operated only when necessary to handle peak flows and acts as a repump station the majority of the year, sending wastewater to the Central Regional WWTF . This operational mode created a zero flow situation for this facility in the current reporting . Since the facility works concurrently with the Central Regional WWTF it is important to review both service areas for new growth in this effort . The current AADF at the North Regional WWTF and Central Regional WWTF are 0 . 0 MGD and 1 . 93 MGD , respectively, as compared to current permitted capacities of 0 . 85 MGD AADF and 2 . 0 MGD AADF . The Central Regional WWTF is under a current expansion to increase its capacity to 4 . 0 MGD AADF , ITS� 6 IRC WWTF Expansion May 2005 The conclusion of this "calibration" effort described above is that in addition to the West Regional WWTF reaching its design capacity within the next two to three years , the North Regional WWTF should also be expanded to address the growing need for wastewater treatment in the north service area . Table 2 and the graphs below summarize the findings of the calibration effort for the North and Central WWTFs . Potential Flow Scenarios for the North and Central WWTFs (MGD AADF ) Table 2 0-2 yr before 0-2 yr after Planning Horizon 3 Current im rovements4 improvements 2-5 yr 5- 10 yr2 20 r Total Vested Capacity 0 . 76 0. 76 0 . 76 0 . 76 0 . 76 0 . 76 North WWTF Flow ith vested and ransfer flows ' 0 . 35 0 . 42 1 . 5 1 . 5 1 . 5 3 . 5 entral WWTF Flow ith vested and ransfer flows ' 2 . 0 4 . 0 2 . 92 3. 22 3 . 72 3 . 84 North WWTF a aci 0 . 85 0 . 85 2 2 4 4 entral WWTF a city 2 4 4 4 4 4 North WWTF % of capacity 41 % 50% 75% 75 % 37% 88% rentral WWTF % of apacity 100% 100% 73% 80 % 93 % 96% ' Additional flow based on new subdivisions and ERUs identified in the January 2005 IRC Community Development Report with an estimate of completed subdivisions , individual occupied lots , and developed parcels according to IRC Metropolitan Planning Organization (MPO) deducted from the total number of ERUs . Flow based on IRC's wastewater level of service of 250 gpd/ERU noted in the March 17 , 1998 IRC 2020 Comprehensive Plan . 2 Flow not necessarily representative as the methodology for flow projections was based on short term data contained in the January 2005 IRC Community Development Report. Longer term planning is in progress based on historical information including new customer connections per month , plant flows , and building permits issued per month . 3 Planning horizon flow assumes flows return to master plan levels and all new flows occur in or are routed to the West Regional WWTF . If the current pace of growth and vested flows continues, the West Regional WWTF may need to be re-rated . It will be extremely important to monitor the pace of growth and the track vested flow versus actual flows seen in IRC 's facilities . 4 Plant situation if no improvements are made in 0 to 2 year horizon PW 7 IRC WWTF Expansion May 2005 Wastewater Capacity and Estimated Flow - North Regional WWTF Figure 4 6.0 Treatment Capacity Demand with Concurrency Demand less Concurrency 4.0 - - - 1 E 1 £ 1 LL 1 �+ 2.0 i 1 5 - 1 1 0.0 2000 2005 2010 2015 2020 2025 2030 Years Wastewater Capacity and Estimated Flow - Central Regional WWTF Figure 5 6.0 ' Treatment Capacity Demand with Concurrency Demand less Concurrency 4.0 v m 1 E 3 1 -- -- - 0 IL 1 1 2.0 _ • n n 0.0 - 2000 2005 2010 2015 2020 2025 2030 Years 8 IRC WWTF Expansion May 2005 Wastewater Capacity and Estimated Flow - Central and North Regional WWTFs Figure 6 10.0 Treatment Capacity Demand with Concurrency Demand less Concurrency 8.0 1 1 - - -" LL 1 4.0 1 2.0 0.0 2000 2005 2010 2015 2020 2025 2030 vean The Department of Utility Services , based on the projected flows , is requesting an immediate expansion of the North Regional WWTF from 0 . 85 MGD to 2 MGD AADF with a Maximum Month Capacity of 2 . 6 MGD . The 2 MGD AADF expansion will be designed for future facilities and treatment capacity to allow expansion to 4 MGD AADF with a 5 . 2 MGD Maximum Month Capacity . The expansion (s) are expected to provide the Department with adequate capacity to meet current and expected growth in the north region through the current planning horizon , based on the information obtained . If you have any questions or comments , please feel free to contact me at 863-533-7000 . Sincerely, PBS&J , Robert Beltran , P . E . , DEE Environmental Services Manager 9 IRC WWTF Expansion May 2005