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9.C. - Page 3 of 30 Plan materials, technical resources, and generally assisting the municipalities in meeting the MRP requirements. The Engineering & Transportation Division staff are taking the lead in coordinating the effort with C/CAG's GI subcommittee. A GI working group has been formed that includes staff from many of the departments within the City, and that group currently meets on a quarterly basis to discuss C/CAG's ongoing efforts and provide input as needed. In May 2017 the City Council adopted a Resolution (Attachment 1) approving the GI Workplan, which is a framework outlining the schedule, budget, and tasks, such as outreach and mapping and prioritizing areas for potential and planned projects, necessary to develop and implement a GI Plan. The resolution included the City Council's commitment to the MRP goals. As outlined in the GI Workplan and required by the 2015 MRP, the City Council must approve the City's GI Plan before June 30, 2019. In May 2018, City staff gave a presentation to the City Council's Utilities Sub -committee (Councilmembers Seybert, Howard, and Aguirre) outlining the results of a preliminary analysis by C/CAG regarding what would be needed to meet the goals of the MRP, which include the additional goals of the GI Plan. Staff investigated compliance with pollutant load reduction goals through a combination of treatment measures built into future development projects and by installing GI in "green streets" projects and found that the cost of public improvements was expected to be more than $100 million. Recognizing that installing green streets was cost prohibitive, staff worked with C/CAG to develop a regional project concept that would serve Redwood City, Woodside, and surrounding unincorporated parts of San Mateo County. The conceptual project is a 2.6 acre infiltration gallery underneath McGarvey Field in Red Morton Park that would divert stormwater from the Redwood Creek culvert that runs through the center of the park (see Attachment 2 — Regional Stormwater Capture Project at Red Morton Community Park). This concept was presented to the Utilities Sub -committee. The project would capture a substantial drainage area of approximately 1,600 acres, and at a cost of approximately $40 million, the price was significantly less than the estimated $100 million green streets cost and would serve to meet 93% of the MRP goals. ANALYSIS The feedback given by the Utilities Sub -committee was that, although the cost savings were beneficial, the $40 million project was still burdensome. Staff then sought other means to meet the MRP goals and focused on the following policies: 1. Requiring stormwater treatment on a wider range of development projects, 2. Requiring developers to install green infrastructure improvements in the right-of-way in order to treat stormwater flowing from the site proposed for development, and 3. Requiring stormwater treatment on an increased number of building remodels. Requiring Stormwater Treatment on a Wider Range of Development Projects After taking a closer look at the MRP, staff examined the thresholds set by the MRP for requiring treatment of stormwater on redeveloped sites. The MRP requires all sites that add or replace 10,000 square feet or more of impervious area (roofs, concrete, asphalt, etc.) to install treatment facilities, and has a lower threshold of 5,000 square feet for auto -related facilities including parking lots. With this in mind, staff analyzed development patterns to identify the type and number of projects being constructed City of Redwood City 1017 Middlefield Road, Redwood City, CA. 94063 Tel: 650-780-7000 www.redwoodcity.org 281