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engineering <br />group, inc. <br />October 15, 2019 <br />Ms. Kara E. Grant <br />Law Office of Kara E. Grant <br />17595 Harvard Suite C-202 <br />Irvine, CA 92614 <br />traffic engineering & design <br />transportation planning <br />parking <br />acoustical engineering <br />au quality & ghg <br />Subject: 301 and 325 North Tustin Avenue Noise Impact Analysis Review, City <br />of Santa Ana <br />Dear Ms. Grant: <br />Introduction <br />RK ENGINEERING GROUP, INC. (RK) is pleased to provide this review of potential <br />environmental noise and vibration impacts from the construction and operation of a <br />proposed express car wash and gas station with convenience market located at 301 and <br />325 North Tustin Avenue, in the City of Santa Ana (hereinafter referred to as project). This <br />review is based on the information provided in 301 and 325 Tustin Avenue Noise Impact <br />Analysis, prepared by LSA, July 2019 (hereinafter referred to as Noise Study). <br />The purpose of this letter is to review the Noise Study from a noise and vibration impact <br />standpoint and provide comments to help ensure that all potential impacts from the <br />project are adequately identified and the effects mitigated to the maximum extent feasible. <br />RK has over 50 years of combined experience in environmental acoustics and has prepared <br />hundreds of noise impact analyses for public agencies and developers in the State of <br />California, and we are fully aware of the complexity of data gathering, modeling, and the <br />possibility for error within these technical documents. <br />Comments <br />Based upon our review, the following comments are provided: <br />1. Page 19, Car Wash Operations. The noise level data utilized to predict future noise <br />levels from the car wash tunnel seems low. RK has collected similar noise level data <br />4000 westerly place, ste. 280 <br />newport beach, ca 92660 <br />0(949) 474-0809 <br />0 rkengineeccont <br />