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12803301 t 3.1 Sound Level Monitoring Sound level monitoring results are presented in Tables I and II (see Appendix B). Tables I and II are the results from the monitoring that was conducted during daytime hours. As shown in the tables, seven of the nine monitoring sites had values that exceeded 70 dBA on at least one of the two days monitored. When background noise from traffic and site activities (not related to MRF operations) was considered, the number monitoring locations exceeding 70 dBA were reduced from seven to two locations. The two locations were N1 and N5. Both were the closest monitoring locations to the MRF. N1 was approximately 35 feet from the north side of the MRF and N5 was approximately 4 feet from the south side the MRF. It should be noted that when a sound level reading was taken at location N5, but along the street and outside of the wall south of s the MRF, the noise level dropped from 73 dBA to 68 dBA. 3.2 Particulate Sampling and Visual Observation The PM10 sample results ranged from 40.7 µg/m3 to 99.9 µg/m3 far the first sampling event conducted on the September 10, 2002, through the September 11, 2002. The second sampling event conducted on September 30, 2002, through October 1, 2002, had PM 10 values ranging from 129.1 µg/m3 to 172.9 µg/m3. The California 24-hour ambient air standard for PM 10 is 50 µg/m3. The lowest results for both sampling events were in the presumed upwind locations N1 and N6. All values during the second event were higher than in the first sampling event. The results are summarized in Table III (see Appendix B) and shown in Figure 2. The laboratory reports and chain-of-custody are 1 provided in Appendix C. At no time during either sampling event were visible levels of dust observed migrating from the MRF. During the second sampling event, winds were strong and there appeared to be visible levels of dust in the ambient air throughout the Lodi area. 3.3 Vibration Monitoring The vibration monitoring results are provided in Appendix D and Summarized in Table IV (see Appendix A). Most values were within the levels required by the San Joaquin County Development Title 9, Section 1025.5. During the monitoring on September 11, 2002, there were two events at approximately 4:00 PM that exceeded the regulatory levels. During the second monitoring on October 1, 2002, there were five events Noise,Particulate,and Vibration Report WM-cVWS Project 128-03 Page 5 October 30,2002