STANTEC CONSULTING SERVICES, INC. (4)

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and understands the particular challenges with pretreatment related to iron and manganese in groundwater and will evaluate this at each well to determine whether pretreatment is needed. + Stantec has partnered with Johns Hopkins University laboratory and is experienced in analytical water quality protocols and analytical techniques. We can assist with additional PFAS sampling plans for City wells, if needed. + Our team brings leading -edge industry knowledge in PFAS regulations and treatment and will leverage this industry knowledge for the City's benefit. For example, we recommend designing the IX vessels to support use with alternative medias or GAC, if future use of alternative media becomes more favorable. We are currently using this design concept for our project in Tempe, Arizona. + We are aware of and track emerging PFAS regulations — our team closely follows recent public health goals from the EPA and the anticipated MCLs from EPA for PFOA and PFOS, and the newly announced NLs and RLs for PFHxS; along with five other PFAS compounds currently on California's list of future regulations. This knowledge can help determine appropriate treatment schemes and better prepare the City for the future. Optimization tools We have considerable experience developing, designing, and implementing water treatment technologies and removal effectiveness of PFAS compounds to non -detect levels. In addition, we have developed a specific tool to evaluate the use of GAC or IX as the base treatment system. As part of our due diligence associated with each project, we will develop a preliminary design analysis for the new treatment processes using our IX Design Tool and can evaluate GAC using a similar tool if desired. The information developed from the treatment modeling efforts will be incorporated into the site development analysis regarding site footprints and equipment arrangements. As a cost -saving approach, performed for other systems, we will also consider use of vessel side taps to monitor the contamination "wave front" as it accumulates in the bed. This advantage is that in some instances, it may be plausible to use only single pass vessels in parallel, reducing the number of vessels by half. This concept has already been approved by the Division of Drinking Water (DOW) for volatile organic compounds treatment systems We are adept at comparing alternatives for cost- effectiveness, for example evaluating individual well site treatment versus centralized treatment. In some cases, the more cost-effective approach is obvious. When its At LADWP's existing, dense North Hollywood Central location —innovation and collaborative design were keys to success for this 25-MGD groundwater treatment plant worth evaluating, we have spreadsheet models that will calculate the capital costs for treatment, conveyance, pumping for decentralized versus centralized scenarios. We also have a team within Stantec who can identify and analyze candidate parcels using GIS and then perform market analyses based on real estate information to help estimate land acquisition costs. The output is life -cycle cost comparisons that reveals the more cost-effective alternative. We most recently performed this evaluation for MWD's regional water reuse program and can apply this tool during the planning phase of your project if needed. Preliminary Schedule Upon notice to proceed (NTP) we will work with City staff to finalize our proposed schedule: NTP/Project Kick-off 1/11/23 1/13/23 3 Meeting Data Collection and 1/16/23 2/24/23 28 Analysis Workshop No. 1— 1/27/23 1/27/23 0 Planning Study Kick off Alternatives Development, Site 1/30/23 3/9/23 28 Planning Workshop No. 2— Present and Review 2/27/23 2/27/23 0 Alternatives Cost Estimate + 2/28/23 3/28/23 21 Permitting + Schedule Draft Report 2/28/23 4/28/23 44 Final Report 5/1/23 6/8/23 28 City of Santa Ana On Call Engineering Design Services for PFAS Treatment Systems RFP NO, 22-133