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1.2.2 Wind Velocity and Direction During summer periods, winds usually originate from the north end of the San Joaquin Valley and flow in a south-southeasterly direction through the valley and Tehachapi pass, and then into the neighboring Southeastern Desert Air Basin. During winter months, winds occasionally originate from the south end of the valley and flow in a north-northwesterly direction. During winter months, the valley experiences light, variable winds, less than 10 miles per hour (mph). Low wind speeds, combined with low inversion layers in the winter, create a climate conducive to high concentrations of certain air pollutants. The California Air Resources Board (1984) analyzed wind data for the Stockton Airport weather station for the period from 1964 to 1980. The prevailing wind for the Stockton station blows from west-northwest (45.3 percent of the time) and north (15.9 percent of the time). Calm winds occur 6.9 percent of the time. A wind rose (Figure 5) developed from the Stockton Airport station data provides wind direction information. The mean annual wind speed is 8.2 mph. Material unloading areas have been designed so that the northwestern prevailing winds direct any windblown particles into the material stockpile or perimeter site fencing, rather than away from it. Site personnel monitor weather conditions regularly and can adjust operations accordingly (e.g., movement of unloading area) to minimize potential impacts. 1.2.3 Weather Event Impacts Typical weather conditions for this vicinity does not generally require adjustments. However, in the event of an extended rain event and/or strong winds, maintenance of windrows may be postponed until conditions improve. This delay between aeration could cause the windrows to attain an anaerobic condition increasing the possibility of odors. Careful consideration of material moisture and odor is taken prior to turning the windrows. Section 3.4 discusses methods (i.e., dust control measures)to address impacts of airborne emissions. 2.0 COMPLAINT RESPONSE PROTOCOL In the event that a complaint is received, an operator's representative will: 1. Go to the location of the complaint to verify that the site is indeed responsible for the odor, and attempt to characterize the odor so it can be traced back to the source. 2. Investigate the nature of the source of the odor complaint and implement operational changes to minimize odors if the odor is emanating from a specific operational phase of the Composting Facility. 3. Document the complaint(s) in the Operations/Special Occurrence Log, including the nature of the complaint. 4. If warranted, meet with the LEA and complainant (if known and choosing to participate) within a reasonable time frame to discuss the nature of the source of the odor and operational changes proposed and/or implemented. 5. Implement one or more of the OIMP management practices (depending upon the odor source and time of year). Forward Compost Facility-OIMP 4 SWT Engineering z:\projects\allied waste\forward\resource recovery facility\5 yr permit rvw 2013-14\tpr 2014\appendices\app a-3-oimp\oimp text-rev 111414.doc;11/18/2014