Laserfiche WebLink
precipitation map for San Joaquin County. The isohyetal precipitation map divides <br />San Joaquin County into three rainfall intensity zones. The RRF/landfill is located in <br />Zone 2 and receives approximately ~17 .87 inches annually. The Forward site is <br />not located within the 100-year flood plain. According to the Federal Emergency <br />Management Agency (FEMAl Federal Insurance Rate Map (FIRM), U.S. Dept. of <br />Housing and Urban Development, May 15, 1980 (see Figure 4), the majority of the <br />landfill is located within "Zone X". which are areas determined to be outside the 0.2 <br />percent annual chance of being in a floodplain. the entire landfill site is within f lood <br />zone designation C. Areas designat ed as Zone C are areas of minimal flooding that <br />l ie outside the 100 year flood plain. <br />1.2.2 Wind Velocity and Direction <br />During summer periods. winds usually originate from the north end of the San <br />Joaquin Valley and flow in a south -southeasterly direction through the valley and <br />Tehachapi pass. and then into the neighboring Southeastern Desert Air Basin. <br />During winter months. winds occasionally originate from the south end of the valley <br />and flow in a north-northwesterly direction . During winter months. the valley <br />experiences light. variable winds. less than 10 miles per hour (mph). Low wind <br />speeds . combined with low inversion layers in the winter. create a climate conducive <br />to high concentrations of certain air pollutants. <br />The California Air Resources Board (1984) analyzed Ww ind data for the Stockton <br />Metropolitan Airport weather station for the period from 1964 to 1980. last 12 <br />months indicates that prevailing winds blow northwesterly for the majority of the year. <br />During the winter months (November through February), winds b low predominantly <br />from the southeast. The mean annua l wi nd speed is approximately 9.0 miles per <br />~ The prevailing wind for the Stockton station blows from west-northwest (45.3 <br />percent of the time) and north (15.9 percent of the time). Calm winds occur 6.9 <br />percent of the time. A wind rose (Figure 5) developed from the Stockton-WB Airport <br />station data provides wind direction information. The mean annual wind speed is 8 .2 <br />mph. Material unloading areas have been designed so that the northwestern <br />prevailing winds direct any windblown particles into the material stockpile or <br />perimeter site fencing, rather than away from it. Site personnel staff will monitor <br />weather conditions regularly and can adjust operations accordingly (e.g., movement <br />of unloading area) to minimize potential impacts . <br />1.2.3 Weather Event Impacts <br />Typical weather conditions for this vicinity will not generally require adjustments. <br />However, in the event of an extended rain event and/or strong winds, maintenance <br />of windrows may be postponed until conditions improve. This delay between aeration <br />could cause the windrows to attain an anaerobic condition increasing the possibility <br />of odors. Careful consideration of material moisture and odor will be taken prior to <br />turnl.ng the windrows. Sections 3.4 and 3.5 discuss methods (i.e., dust control <br />measures) to address impacts of airborne emissions. <br />Forward Compost Faci lity -OIMP 4 SWT Engineering <br />z:\projects\allied waste \forwardVesource recovery facility \5 yr permit rvw 2013-14\rcsi 2014\appendices\app e-oimp \oimp <br />text.doc; 5/16/2014