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4.6 – Noise <br />Draft Environmental Impact Report February 2021 <br />14800 W. Schulte Road Logistics Center 4.6-13 <br />Table 4.6-7. Traffic Noise (Existing and Future Noise Levels) <br />Modeled Receptor <br />Existing <br />(dBA <br />CNEL/Ldn) <br />Existing <br />with <br />Project <br />(dBA <br />CNEL/Ldn) <br />Difference <br />(dB) <br />Future <br />(dBA <br />CNEL/Ldn) <br />Future <br />with <br />Project <br />(dBA <br />CNEL/Ldn) <br />Difference <br />(dB) <br />ST1: West of Project site, adjacent <br />to CAL FIRE Station 26 at 16502 <br />West Schulte Road <br />66 66 0 69 69 0 <br />ST2: West of Project site, adjacent <br />to residence at 25730 Hansen <br />Road <br />55 55 0 62 62 0 <br />ST3: East of Project site, adjacent to <br />residence at 25613 South <br />Lammers Road <br />60 60 0 61 62 1 <br />ST4: East of Project site, adjacent to <br />residence at 25700 South <br />Lammers Road <br />59 59 0 61 61 0 <br />ST5: Northwest of Project site, <br />adjacent to residence at 24142 <br />Hansen Road <br />64 64 0 69 69 0 <br />ST6: West of Project site, adjacent <br />to residence at 24365 Mountain <br />House Parkway <br />62 62 0 65 65 0 <br />Source: Appendix E-3. <br />Notes: <br />dBA = A-weighted decibel; CNEL = community noise equivalent level; Ldn = day night average sound level; dB = decibel <br />On-Site Operational Noise <br />Project-related operational noise sources are expected to include idling trucks, delivery truck activities, backup <br />alarms, loading and unloading of dry goods, rooftop air conditioning units, and parking l ot vehicle movements. <br />The following analysis evaluates noise from these on -site operation noise sources. The analysis is based on <br />in-house spreadsheets, which incorporate standard industry calculations for the sum of noise from multiple <br />sources, outdoor at tenuation with distance from the noise source(s), and attenuation from barrier placement <br />between sources and receivers. <br />Outdoor Mechanical Equipment <br />The three proposed warehouse spaces would not be served by heating or air conditioning equipment. However, the <br />floor plans include office spaces within each of the proposed buildings that would be served by heating and air <br />conditioning equipment. The proposed office areas on the Site Plan are indicated to have floor areas of <br />approximately 3,000 square feet each (approximately 9,000 square feet combined). Based on similar size offices <br />in this region, it is anticipated that each of the three office spaces would be equipped with one 4 -ton package HVAC <br />unit. For the analysis of noise from HVAC equipment operation, a York Model ZF-048 package HVAC unit was used <br />as a reference. Noise level data provided by the manufacturer was used to determine the noise levels that would <br />be generated by each of the HVAC package units. The York Model ZF-048 package HVAC unit has a sound power <br />rating of 80 dBA (Appendix E-4). Based on the applicant information provided, there would be a 7-foot-high parapet <br />extending along the perimeter of the roof.