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a: City of Santa Ana <br />On -Call Stormwater Project Design Services RFP No.: 20-102 <br />Advanced Treatment Systems <br />The abovementioned, among other, alternatives are typically more favorable than advanced <br />treatment, while it may be beneficial at the right time and place. Advanced treatment can be <br />used to reduce pollutant loads before discharging downstream or as part of a treatment train <br />process in which treated flows can then be used for other beneficial purposes (typically non - <br />potable). CWE led the design of the Los Amigos Park project, which used captured runoff for <br />toilet flushing and spray irrigation. These uses have the potential for human contact; therefore, <br />advanced treatment was required. Captured runoff can also be used in drip irrigation systems <br />without advanced treatment. We also led a regional low flow diversion project, in which three <br />sites capture runoff from over 35,000 acres. The dry <br />weather flow rates were going to result in $600,000 to <br />$850,000 annual sewer discharge fees, which add up <br />quickly over time. As an alternative, Ultraviolet (UV) ? \ - <br />advanced treatment systems are being placed to treat <br />runoff before discharging it downstream. This was <br />determined to be more cost effective than a sewer �* <br />diversion. We understand various treatment systems, r 7. , <br />when they are most suitable, and how to use them to <br />achieve compliance and meet multiple benefits. <br />Table 5 Common Advanced Treatment System Challenges and Constraints <br />Typical Tasks <br />CWE will prepare a detailed scope of work tailored to each project that comes through this on - <br />call contract. This section summarizes typical tasks expected based on the RFP and our <br />expertise on similar projects. The table below includes an outline of potential tasks by <br />category/phase with minimal descriptions. We have kept the descriptions short due to page <br />limitations, while comprehensive descriptions will be provided before the start of a contracted <br />project. Task with asterisks (**) are in addition to those identified in the RFP. We feel it is <br />important for the City to have a feel for what it would be like to work with CWE to better inform <br />the selection process. We hope to meet with the City (in person or virtually) to further discuss <br />our experience, expertise, and how we would benefit the City. <br />-12- <br />CW= <br />