TO: Public Works Commission FROM: Robyn Mattison, Jim Pardy, and Paul Zimmerman DATE: April 5, 2017 RE: Water Renewal Fund Capital Projects

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1 TO: Public Works Commission FROM: Robyn Mattison, Jim Pardy, and Paul Zimmerman DATE: April 5, 2017 RE: Water Renewal Fund Capital Projects MAJOR PROJECTS, INITIATIVES, CURENT ISSUES Clean Water: Major Projects Status Water Renewal Facilities Plan A team led by Brown & Caldwell is performing Wastewater Facilities Plan updates to the plan last updated in Work phases have been defined, and the first phase, which includes updating our system baseline, was completed in Dec Currently $1,300,836 remains in the facilities planning budget. The scope for the second phase of work (solution development) is being developed, and work will begin early in Related planning work includes: A task order is underway with HDR to update the facility plan for the Twenty Mile South Biosolids Application Site (TMSBAS). The bio-solids loading rates have finally stabilized enough from process changes at the treatment plants to complete our baseline calculations. We have spent $54, out of the revised budget of $113, (48%). The current completion date has been revised to August 31, A new task order is underway with HDR to provide continued regulatory guidance throughout the NPDES permit re-application process. We have spent $140, out of the original budget of $145, (97%). The current completion date was February 11, A task order with HDR to help analyze the new Biotic Ligand Model (BLM) has been completed. BLM is a tool used in aquatic toxicology to examine the bioavailability of metals in the aquatic environment and the affinity of these metals to accumulate on gill surfaces of organisms. We have spent $5, out of the original budget of $22, (25%). SPF Engineering has completed the water rights and well drilling work for the Watershed s water feature as well as advise us about the Fire Training Facility s future water use. They will continue to assist us in transferring our existing water rights from within the West Boise WWTF to other uses. They have also been involved with water rights issues related to the new

2 compost facility located at the TMSBAS. We have spent $6, out of the original budget of $10, (63%). Temperature Mitigation Studies Staff continues to work with IDEQ and the EPA in developing temperature mitigation strategies. West Boise WRF Phosphorus Removal The contract for the West Boise Phosphorus (P) Removal Project was completed and closed in Jan 2016 (Enhanced Biological Nutrient Removal, or EBNR). As follow-up, additional design features were added to improve performance of the fermenter mixing system, which proceeded with construction in Sept The fermenter mixing system modifications are scheduled and expected to reach completion in July Operation of the EBNR process has improved and stabilized since July EPA approved the City s request for a major NPDES permit modification to adjust the West Boise interim P limits from a seasonal average of 600 µg /L Total Phosphorus (TP) to an annual average of 2,800 µg /L TP. The resulting calculation of the combined average from May 2016 through February 2017 is currently 1,375 µg /L TP and is expected to meet the annual limit of 2,800 µg /L TP. The Operations Division has been effectively producing struvite which is a critical component to comply with the TP discharge limits. Decreased performance of the Struvite Production Facility (SPF) quickly affect facility performance and impact effluent TP discharge concentrations. A significant and innovative process modification was completed by internally combining two separate treatment processes into a single blended feed to the SPF in mid-september The blended flows improve TP recovery (as struvite) which has also improved the consistency of the final struvite in the heat treatment process (Rollomixer). The process change was also able to utilize the available ammonia in the BFP filtrate and eliminate the purchase of commercial aqueous ammonia used in the PFLT struvite reactors. The struvite heat treatment system required to satisfy EPA s 503 regulations for pathogen reduction in biosolids has been able to nearly match the struvite production rate. Final implementation of the struvite disposition contract is being negotiated with the technology provider, Multiform Harvest, Inc. (MHI). The City released six (6) full semitrailer loads of struvite, which met the Class A criteria, to MHI in February 2017 for processing as a commercial fertilizer product. West Boise Capacity Improvements: Anaerobic Digestion and Dewatering The project focus areas are biofilter expansion to meet current needs, reviewing the sludge dewatering system and investigating limitations in anaerobic digestion capacity. A budget of $8.7M is approved. HDR is the design professional. Advertisement for Bids for a new biofilter cell will be published in April 2017, with construction completion expected in the fall of Dewatering evaluations are complete resulting in rehabilitation of the existing Belt Filter Presses with new and factory refurbished belt Page 2 of 5

3 rollers. New digester design is delayed until upgrades and inspection of the existing digesters. Current digester work includes piping modifications to allow parallel flow operation to all 3 digesters, cleaning and condition assessment of the existing digesters and optimization of the existing digestion capacity. HDR will perform condition assessments of the digesters. Next phase decisions will depend on the condition of the existing digesters. Dixie Drain Phosphorus Removal The Dixie Drain Phosphorous Removal Project construction is complete and final closeout of the construction contract was completed in February Final construction cost was $14.94 million, compared with the Guaranteed Maximum Price (GMP) of approximately $16.16 million after change orders of 1.2 percent were incorporated. Procurement of a mechanical screen cleaning system is complete and a purchase order has been issued by the City. Installation is anticipated in Fall Full scale testing of chemicals from six vendors was completed in Oct Bids for chemical supply have been solicited and a supplier will be selected prior to start-up of operations (May 1 st ). Lander Street WRF Plant-Wide Improvements The City s current NPDES permit for Lander Street (LS) requires low effluent TP concentrations with a schedule of compliance no later than September 1, Critical projects at Lander Street to meet the TP schedule of compliance and to replace critical aging infrastructure were identified from the Facility Plan and have proceeded into conceptual design. A CIP budget was approved beginning in FY17. Work during the first 5 years is expected to include Site Utilities Improvements, new Preliminary Treatment, new Effluent Filtration to achieve the low effluent TP limits, and Ultra-violet light (UV)disinfection improvements. Engineering design is contracted to a team consisting of CH2M with Brown and Caldwell. The City also determined that project delivery using the Construction Manager / General Contractor format improved the coordination of a complex project on a constrained site, and improved accuracy of construction cost estimating in support of budgeting and managing cash flow. The City selected McAlvain as the CM/GC for pre-construction and construction phase services. A task order with the CH2M/B&C is currently underway to review treatment technologies, prepare Project Definition Reports, and develop permitting and community engagement plans. Public Works Engineering defined the goal to complete construction in FY21 to allow one full year of operation before the NPDES compliance date. All LS improvements are expected to cost up to $80M over the next 10 years, with up to $58M before FY22. Clean Water: Issues & Strategies Currently the Clean Water Section has 11 FTEs, including two control system techs that were transferred from the Operations Division. The last workload projection estimated between 13 and 18 FTEs will be required through 2018 to complete planned projects. The current strategy of hiring consulting services to make up the difference between City staff and required staff will continue. In addition to the projects discussed above, Page 3 of 5

4 the projections include near-term future projects driven by NPDES permit requirements: filtration at West Boise for additional P removal, and effluent temperature mitigation for both WRFs. Future project needs will be updated when the Facilities Planning plant capacity assessments are completed. In December 2013 two additional positions for a process controls engineer and a process controls programmer were approved by the City Council. Only 1 was filled, and in the summer of 2016 the other position was forfeited to gain a full-time instrument technician at LS. The controls Engineer II position was filled in July 2015, and a large amount of work, some previously unrecognized, has been identified: creating, organizing and updating wiring drawings for maintenance troubleshooting; updating control standards; establishing electrical standards; developing electrical distribution models for both WRFs that are necessary for arc flash analyses; supervising two control systems technicians; and managing or providing electrical and controls support on CIPs. The intent with the addition of these employees and the organizational changes is to maintain and monitor the automated plant controls in a systematic manner that will reduce the incidents of controls failure or of troublesome controls being overridden, and to plan for systematic technology upgrades. Staff is considering some staffing adjustments to better accomplish these goals. Sewer Design: Line Projects Status Small Diameter Sewer Pipe Rehabilitate/Replacement Program In accordance with the small diameter pipe rehabilitation/replacement program three projects, each comprised of 15 line segments, have been identified to be completed in fiscal year The first project, awarded to Titan Technologies in the amount of $387,000, is currently under construction with two segments left to complete. The second project has been also awarded to Titan Technologies in the amount of $319,000 and construction will begin in April. The third and final small diameter rehabilitation/replacement project for 2017 is in the design phase and anticipated to be constructed in the late spring. Sewer Design: Issues & Strategies The cost of the work for the first and second projects came in higher than the engineer s estimate. This is most likely attributed to a highly active pipeline construction industry and an increase in material cost. Based on the recent bid results sufficient funds are not available in the small diameter rehabilitation/replacement CIP budget to complete the final project for FY17. An interim budget change in the amount of $250,000 will be requested on April 11 which is the next scheduled capital interim budget request meeting. Savings from the Beacon Street sewer extension and the Dixie Drain project are the source of identified funds for this request. Large Diameter Pipe Rehabilitation Program The large diameter sewer pipe point repairs project, consisting of three point repairs and manhole rehabilitation, has been bid and awarded to Pipeline Inspection Services Page 4 of 5

5 in the amount of $129,350. Construction is scheduled to start in early April. Issues & Strategies: No issues. Page 5 of 5