Pima County Regional Optimization Master Plan Michael Gritzuk

Pima County Regional Optimization Master Plan Michael Gritzuk, P. E. , Director, Pima County Regional Wastewater Reclamation Department Arizona County Engineers Association Wickenburg, Arizona January 10, 2008 1

PCRWRD Treatment Facilities 1 Roger. Road WWTP 2 Ina Road WPCF 3 Green Valley WWTF 4 Pima County Fairgrounds WWTF Avra Valley WWTF 5 6 Corona de. Tucson WWTF 7 Arivaca. Junction WWTF Marana WWTF 8 Mt. Lemmon WWTF 9 Rillito. Vista WWTF 10 Randolph. Park WRF 11 2

The Metropolitan Sewerage System Ina Road WPCF Sewer Basin = 198 square miles Ina Road WPCF Roger Road WWTP Sewer Basin = 275 square miles 3

Regional Optimization Master Plan Goals • • • Current and future regulatory compliance • • State-of-the-art technology Meet capacity needs to 2030 Upgrade / rehabilitate aging infrastructure Staff-friendly 5 -stage Bardenpho process Automation Community acceptance (Source: EIMCO Water Technologies) Clarifier N 2 1 Fermentation O 2 2 First Anoxic 3 Nitrification Recycle Sludge N 2 4 O 2 5 Second Re-aeration Anoxic Waste Sludge 4

Regional Optimization Master Plan Scope of Work ü Develop the optimal treatment process and plan to comply with regulatory requirements to reduce total nitrogen concentrations in discharged effluent ü Master plan foreseeable future regulatory requirements ü Determine the long-term capacity needs of the County metropolitan facilities, conveyance system and outlying growth areas Ina Road WPCF Headworks 5

Regional Optimization Master Plan Scope of Services ü Develop long-term plan for the treatment, handling and reuse of system bio-solids and bio-gas ü Develop a detailed implementation schedule to meet regulatory implementation deadlines and the optimization master plan ü Develop a financial plan to support the system’s regulatory and other needs for the next fifteen years 6

Regulatory Implementation Requirements t Reduce Total Nitrogen Concentrations Ina Road WPCF ü Complete initial February 1, 2007 engineering study ü Recommendation for upgrading treatment plants ü Submit recommended plan letter to ADEQ Roger Road WWTP January 30, 2007 ü Award contract for construction December 31, 2010 January 30, 2011 üTreatment of effluent January 30, 2014 January 30, 2015 to non-toxic nitrogen levels 7

ROMP Plan üExpand Ina Road WPCF to 50 mgd ü Construct new 32 mgd Water Reclamation Campus (in vicinity of existing Roger Road WWTP) ü Plant Interconnect – 28 mgd average, 72 mgd peak flow üDecommission existing 41 mgd Roger Road WWTP Ina Road WPCF Roger Road WWTP 8

ROMP Cost Estimate (2006 dollars) Ina Road WPCF Upgrade/Expansion $243, 900, 000 Electrical Upgrades $35, 000 Plant Interconnect $22, 300, 000 Water Reclamation Campus Roger Road WWTP Demolition Total Estimated Cost $211, 000 $23, 800, 000 $536, 000 * * Cost estimate includes design costs, UV disinfection and 5% contingency. 9

Ina Road WPCF • Expand treatment capacity to 50 mgd § Convert existing process to Bardenpho process § Additional 12. 5 mgd expansion § Most cost-effective utilization of existing headworks capacity of 50 mgd • Centralized biosolids processing and handling § Reduces overall cost § Provides for co-generation bio-gas utilization at one location § Provides one point of distribution of final product 10

50 MGD Ina Road RWRF Overall Plant Aerial View with Screen Enclosure Existing and Expanded Ina Road. RWRF Approximately 160 acres EXISTING PROPOSED: Bardenpho Treatment Units Primary Clarifier Secondary Clarifiers Digesters Thickener Tanks Enhanced Chlorination Proposed extent of screen enclosure Sports Park 11

50 MGD Ina Road WPCF Screen Enclosure Concept, Interior View South facing solar panels w/perimeter lighting Wire mesh screen Natural stone gabion base Cor-ten steel frame 12

32 MGD Water Reclamation Campus Overall Aerial View Preliminary Treatment Aeration Basins Clarifiers Water. Reclamation Campus NORTH Approximately acres 41 Disinfection Central Lab Building Administration Building Existing Roger. Road WWTP Sant Approximately 48 acres er z Riv a Cru 13

32 MGD Water Reclamation Campus Admin. and Central Lab Building Concept Aerial View Parking Central Lab Building Administration Building • Recycled content aluminum shell with natural finish • West façade perforated for sun control with view maintained • Solar collection capacity over roof surface 14

32 MGD Water Reclamation Campus Support Building and Aeration Tank Concepts Santa Cruz River Aeration Tanks Clarifiers Support Building 15

32 MGDWater Reclamation Campus Admin. and Central Lab Building Portico at east face of buildings facing athletic fields 16

Implementation Schedule 17

ROMP Implementation Costs Current Estimated Cost (2006 dollars): million Cost Inflation (assuming an inflation rate of 5% over 15 years): Bonding / Debt Service $536 $719 million $1+ billion 18

Possible Community Enhancements § Park enhancements Softball Diamonds § Regional / International Sports Complex § Economic development § Environmental enhancement § Water Reclamation Campus § Study underway Commercial Development Soccer Fields Baseball Diamonds Existing WWTP Wetlands 19

ROMP Procurement Schedule 20

Plant Interconnect – Roger Road WWTP to Ina Road WPCF Design Consultant – Brown & Caldwell Contract : June 2007 Contruction Manager at Risk: selected, under negotiations Contractor Project Management: PCRWRD staff Full-time Inspection: To be determined 22

Ina Road Upgrade/Expansion Design Consultant RFQ advertised: October 2007 Selection process: Underway Consultant selected: February 2008 Complete negotiations & NTP: April 2008 Construction Manager at Risk RFQ advertised: December 2007 Anticipate contract: March 2008 Project Management: To be determined Full-time Inspection: To be determined 23

Water Reclamation Campus Procurement Method Decided: Summer 2008 Examples of methods to be evaluated: Design Build (DB) Design Build Operate (DBO) Design Build Finance Operate (DBFO) Others? RFQ Advertisement: Fall 2008 Project Management: To be determined Full-time Inspection: To be determined 24