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BOLLARD ACOUSTICAL CONSULTANTS , INC . )))) Acoustics ► Vibration ► Noise Control Engineering September 1, 2011 Mr. Rod Attebery Neumiller & Beardslee P.O. Box 20 Stockton, CA 95201-3020 Subject: Results of Munn & Perkins Nighttime Operations Noise Surveys Dear Mr. Attebery, Pursuant to your request, Bollard Acoustical Consultants, Inc. (BAC) has completed a noise survey of nighttime operations at the Munn & Perkins aggregate facility in San Joaquin County, California. The noise survey consisted of the monitoring of vehicle pass-by single events at two locations (Sites 1 & 2 on Figure A), and on-site equipment (asphalt plant and related equipment) at one location (Site 3 on Figure A). Site 2 was monitored continuously from August 16-25, 2011, whereas Sites 1 and 3 were monitored on three distinct nights (August 16, 22 & 25, 2011). The purposes of the noise measurement survey were two-fold: to determine the state of compliance of on-site noise generation with the 45 dB Leq nighttime noise standard at the nearest potentially-affected residences to the east, and to determine the effectiveness of the proposed "optimized heavy truck operating procedures" specifically developed for this project to minimize heavy truck pass-by noise during nighttime hours. The results of the monitoring program are described below separately for on-site noise sources and off-site heavy truck pass- by single-events. On-Site Noise Source Monitoring Results (Site 3) Site 3 on Figure A represents the location of the nearest residence to the east which is potentially affected by noise generated by the on-site operation of the asphalt plant. The meter at this location was placed on a tripod near the top of the hill, on the Munn & Perkins project site just west of Burwood Lane and just south of the existing residence. This location was monitored from approximately 10 pm to 1 am on three separate nights during which asphalt production at the Munn & Perkins plant was taking place. A Larson Davis Laboratories (LDL) Model 820 precision integrating sound level meter was used for the ambient noise level measurement survey at Site 3. The meter was calibrated before use with an LDL Model CAL200 acoustical calibrator to ensure the accuracy of the measurements. The equipment used meets all pertinent specifications of the American National Standards Institute. The results of the ambient noise monitoring survey at Site 3 are presented in Figure B. 3551 Bankhead Road :- Loomis, CA 95650 :- Phone: (916)663-0500 '� Pax. (916)663-0501 % BACNOISE.COM