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• Treatment system commissioning and startup planning and support. • PFAS waste disposal planning. • Pump to waste planning and OCFCD permit compliance planning. • Water quality sampling and UCMR5 compliance planning. KJ I Orange County Water District I PFAS Well Treatment System Preliminary and Final Design I Completed October 2022 Team: Steve Diamond, Kajori Purkayastha, Ray Lyons, Paul Post, Peter Symonds, Ed Pascua, David Ferguson KJ completed final design for the $22AM project providing wellhead IX PFAS treatment at four well sites (total flow is 8,000 gpm). Delivery included pre -procurement of vessels and a fast -track design completion within seven months. Project included hydraulic evaluations to assess the use of existing well pumps and or need for booster pumping. IX media was pre -purchased based on pilot testing results. KJ addressed entrained air at two of the wells with degassing; this issue was not originally anticipated by the Owner. Through active communication with staff and implementing pre -procurement strategies, KJ managed a 7-month, fast -track design schedule. • Developed preliminary and final design for providing wellhead ion exchange PFAS treatment at four (4) well sites (total flow = 8,000 gpm). • Pre -procured Ut vessels. • Fast track design schedule in 7 months. Project Contact: Chris Olsen, PE Director of Engineering (714) 378-3232 KJ I Santa Clarita Valley Water Agency I N-Wells and Q2 Well PFAS Treatment Completed 2020 Team: Steve Diamond, Kajori Purkayastha, David Ferguson, Paul Post, Peter Symonds, Ed Pascua In response to the new PFAS regulatory levels in February 2020, approximately 45 percent of the Santa Clarita Valley Water Agency's (SCV Water) groundwater wells were removed from service. SCV Water, along with KJ and WQTS, completed bench testing, fast -track design, and construction on treatment of four SCV Water wells impacted by PFAS. Three of these wells, known as the N-Wells, produce up to 6,000 gpm. The fourth well, Well Q2, has a treatment capacity of 1,200 gpm. Raw water from Q2 well also contains Perchlorate sampled above the California MCL. Single -use Ion Exchange (IX) was selected as the preferred technology for PFAS removal at both treatment locations. For the N Wells centralized treatment site, the design consists of three lead -lag trains of 12-foot diameter ion exchange vessels, or a total of 6 vessels. Pre-treatment via high -flow cartridge filtration is also included prior to treatment. For the Q2 well, one lead -lag train utilizing two Ion Exchange vessels was installed. KJ completed the design of the treatment facilities and chemical feed systems in four months and provided engineering services during a construction period of eight months to help bring the system online by October 2020. • Prepared procurement documents for pre -purchasing 6,000 gpm IX system and resin for PFAS Treatment at N-Wells and the Q2 Well. Project Contact: Shadi Bader, PE Senior Engineer (661) 310-6410 EEC Environmental 12 November 17, 2022