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III. ENVIRONMENTAL SETTING,IMPACTS AND MITIGATION MEASURES D. NOISE least 400 feet from the main transfer station activities located on the eastern portion of the project site. Noise associated with the container storage area would not change substantially from. existing conditions and is assumed to be accounted for in the measured ambient noise data shown in Table IIID-2. Greenwaste processing and transfer station operations would occur intermittently but continuously throughout the operating hours of a given day. Regarding absolute changes in noise levels,the expanded transfer station operation could produce noise levels that would violate residential property line maximum noise limits established in the City's General Plan. Table III.D-5 shows estimated noise levels from the most representative and most pervasive activities at the transfer station at the nearest residences on Temple Street. The unmitigated noise levels shown in Table IIID-5 reflect a combination of noise associated with collection and transfer truck operation at the site,transfer truck loading,greenwaste processing, and general noise from within the transfer station. The noise level also takes into account attenuation from distance, a 15 dBA reduction in greenwaste processing noise afforded by the transfer station building. The assumptions used to derive the hourly Leg values are shown in Table A-6 of Appendix A. Table IIID-5 shows that by constructing an 6-foot masonry wall proposed, under Mitigation Measure A.1c, along the western boundary of the site and limiting the hours of greenwaste processing activities to between the hours of 7:00 a.m. and 5:00 p.m. (the least noise-sensitive hours of the day),the City's daytime Ley standard could be met. Conversely, the City's nighttime Leq standard could not be met even if the wall were extended to a height of 10 feet rather than 6 feet. For comparative purposes,Table IIID-5 also shows that existing hourly Leq values at residences during nighttime hours of operation (4:00 a.m. and 7:00 a.m.)are between 52 and 61 Leq. Therefore,a violation of the City's nighttime Leq standard may not be audible at nearby residences,but would be a significant impact of the project. As shown in Table IIID-6,project operations would not significantly affect the overall DNL values at nearby residences. To predict the relative increase in noise levels from increased transfer station activities at adjacent residences on Temple Street,the predicted noise levels contained in Table IIID-5 were added to the corresponding hourly Leq noise levels actually measured for all hours between 4:00 a.m. and 5:00 p.m.,the proposed hours of operation. Again, the analysis considered the impact on weekday and weekend noise levels. Tables A-7 and A-8 show that the resultant noise level at residences on Temple Street on weekdays and weekends would be 66 and 61 DNL,respectively, with the 6-foot wall and hourly limitations on green waste processing activities. It should be noted that this estimate is conservative in that it assumes continuous operation of all equipment for the entire proposed working day (4:00 a.m. to 5:00 p.m.). On this basis,the net increase in noise levels at residences from existing conditions would be less than significant. For nearby industrial land uses, it is assumed that the noise environment would be similar to that measured at the church located adjacent to the project site,65 DNL.The City of Stockton allows noise levels of up to 80 DNL for industrial uses. For the purposes of this EIR,noise levels under Storkton Scavenger Transfer Station E.rpansion III.D.15 ESA/990190