STANTEC CONSULTING SERVICES, INC. (4)

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A. COVER LETTER November 17, 2022 Attention: Armando Fernandez, PE City of Santa Ana Public Works Agency Water Resources Division 220 S. Daisy Avenue, M-85 Santa Ana, CA 92703 Reference: Proposal For On -Call Engineering Design Services for PFAS Treatment Systems, RFP No. 22-133 Dear Mr. Fernandez and Selection Committee Members: The City of Santa Ana (City) is proactively addressing the challenge of providing your residents with a safe, reliable water supply by treating your groundwater wells for polyfluoroalkyl substances (PFAS), to comply with California's notification levels. Under Orange County Water District's (OCWD) PFAS basin -wide program, of the 21 City wells, four treatment systems are in various stages of design and construction to treat five wells impacted by PFAS. The 2020 Carollo Producer Report, prepared by OCWD, identified nine impacted City wells and evaluated individual or centralized treatment schemes. Your planned feasibility study will build upon that early effort to develop a comprehensive City-wide plan to address PFAS at all impacted wells. Stantec Consulting Services Inc. (Stantec) has been involved in PFAS research, planning, and treatment design for more than a decade. We regularly track both federal and state regulations for our clients across the US. Through our ongoing work at your four OCWD-selected well sites, we have gained significant experience in learning how your water system operates and the unique challenges at each location. Well sites within and adjacent to park areas will require coordination and buy -in from your Parks Department, as well as nearby affected residents. Older well sites may require electrical and or controls upgrades to update to current City standards. In turn, Stantec has teamed with Enterprise Automation (EA) to help design treatment systems that incorporate your system control and operation strategy. Some well sites also have limited treatment space available, such as your Well 38 site that presents unique design challenges. In addition, Leighton Consulting, Inc. (Leighton) will provide geotechnical support, as they have at your four current project sites. Stantec has partnered with both EA and Leighton on the OCWD projects for the City. We recognize this is a significant financial impact to system operations and the sooner affected wells come online, the less you have to rely on costly imported water. With a City -led treatment program, projects can be accelerated to meet your schedule rather than relying on OCWD-led designs that have been extended, due to faster and larger expenditure of OCWD funds. Also, the City can progress with treating all affected wells, irrespective of PFAS levels, pending available funding. To expedite implementation and construction, Stantec recommends the City consider prepurchasing long -lead items. Lessons learned from our recent experience with OCWD projects demonstrated that treatment vessels require significant lead time for delivery, which prompted OCWD's prepurchase of up to 150 vessels. Similarly, emergency generators and motor control centers are experiencing several months to more than a year in lead time. Stantec can work with the City to prepare prepurchase designs and specifications early in our design process to minimize these material delays. Our team also provides the following benefits: Well Established Local Relationships and Knowledge of Local Infrastructure Our project manager/principal agent, Jim Cathcart, PE, F. ASCE, has been working in Orange County for most of his 45-year career. He is currently overseeing the team working on OCWD's PFAS Treatment Systems Design for the City. These established relationships and knowledge of local infrastructure will benefit the City by implementing your treatment systems quickly and efficiently. City of Santa Ana On -Call Engineering Design Services for PFASTreatment Systems RFP NO. 22-133