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April 1, 2019 Ron Ono Administrative Services Manager City of Santa Ana Parks, Recreation and Community Services Agency 20 Civic Center Plaza Santa Ana, CA 92701 Subject: CEQA/NEPA Documentation for Parkland Substitution for the Rancho Santiago Community College's Lease at Centennial Park Dear Mr. Ono We understand the City is considering a change to the plans for substitute parks at 6`h Street and Raitt Street to include a lighted skate area and a stormwater retention facility (i.e., river rock bioswales). Adding a skate facility to these parks will substantially change the character of the parks, which are currently designed to serve as community gardens, which are passive, walkable parklets. Adding skate areas will convert portions of parks to active use. Lighted skate facilities can be expected introduce noise, traffic and parking impacts that would not occur with the current proposals. Especially, lights extending park use as late as 10 pm, given fhe adjacency to residential properties, may generate significant impacts and public opposition. This letter identifies the potential impacts that may occur as a result of the change to the project and scope of work required to address those issues. NOISE AND VIBRATION PlareWorks will revise the noise and vibration assessment for the project based on the proposed skate park with lighting. Impacts from the construction and operational phases of the proposed project will be addressed. PlaceWorks proposes to collect noise monitoring data at or adjacent to a comparable skate park through a field survey including up to four short-term (15 minute) noise measurements. Long-term operational noise impacts will be primarily related to project -generated traffic and recreational (skating and voices) noise. The traffic forecasts included In the project's traffic study will be used to update the traffic noise impact assessment relative to project -related vehicle trips. Project -related construction noise may change depending on any changes to the proposed overall construction schedule and equipment for use. An assessment of temporary noise and vibration impacts during project construction activities will be conducted using industry -standard analysis techniques and using scheduling, equipment mix, hauling, and truck trip Information (as provided by the applicant). Vibration impacts will be assessed per criteria included in the FTA's guideline document on noise and vibration impact assessment. The findings of the technical analyses and Impact assessment will be provided in a noise and vibration section of the IS/MND, along with mitigation measures (for example, the skate park if operating at night may need to be enclosed in a building due to the proximity to nearby residences). Pertinent calculations and technical information will be provided in an attached appendix. , \ a , )Cn. `_ . L00 S . , A c a Jfcenia e, z 7i1 f 1+ •66 9%2 P a' - Uacr >;.cu