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City of Santa Ana On -Call Stormwater Project Design Services RFP No.: 20-102 Advanced Treatment Systems The abovementioned, among other, alternatives are typically more favorable than advanced treatment, while it may be beneficial at the right time and place. Advanced treatment can be used to reduce pollutant loads before discharging downstream or as part of a treatment train process in which treated flows can then be used for other beneficial purposes (typically non - potable). CWE led the design of the Los Amigos Park project, which used captured runoff for toilet flushing and spray irrigation. These uses have the potential for human contact; therefore, advanced treatment was required. Captured runoff can also be used in drip irrigation systems without advanced treatment. We also led a regional low flow diversion project, in which three sites capture runoff from over 35,000 acres. The dry - weather flow rates were going to result in $600,000 to $850,000 annual sewer discharge fees, which add up quickly over time. As an alternative, Ultraviolet (UV) advanced treatment systems are being placed to treat runoff before discharging it downstream. This was ` determined to be more cost effective than a sewer diversion. We understand various treatment systems, when they are most suitable, and how to use them to achieve compliance and meet multiple benefits. Table 5 Common Advanced Treatment System Challenges and Constraints Challenge/Constraint Strategies Non -potable demand with Utilize advanced treatment in accordance with local codes and human contact requirements, such that runoff can be used to meet local demands Public concerns regarding Outreach campaign to create clear and easy to follow messaging chemicals to educate community on treatments stem operations Space limitations Various equipment can be used and configured to reduce footprint requirements while meeting project goals Operation and Long-term needs presented early on to inform decision making; maintenance maintenance crews can be trained or consultants may be used Typical Tasks CWE will prepare a detailed scope of work tailored to each project that comes through this on - call contract. This section summarizes typical tasks expected based on the RFP and our expertise on similar projects. The table below includes an outline of potential tasks by category/phase with minimal descriptions. We have kept the descriptions short due to page limitations, while comprehensive descriptions will be provided before the start of a contracted project. Task with asterisks (") are in addition to those identified in the RFP. We feel it is important for the City to have a feel for what it would be like to work with CWE to better inform the selection process. We hope to meet with the City (in person or virtually) to further discuss our experience, expertise, and how we would benefit the City. -12- GE25F-134