ARCHIVED REPORTS_JULY 2014 FINAL RCSI

Home Browse Search

3-11 Forward Composting Facility SWT Engineering Report of Composting Site Information - July 2014 z:\projects\allied waste\forward\resource recovery facility\5 yr permit rvw 2013-14\rcsi 2014\text\sec 3.doc result, will not inundate or potentially erode the adjacent creek or inundate the landfill. The predicted elevations from the 500-year flood event range from 40.5 feet on the southwest edge to 43 feet on the east edge of the landfill along Austin Road and this level is only one to two feet higher than the toe of existing landfill slopes. The existing South Fork of South Littlejohn’s Creek was designed to channel the 100-year flood flow of 1,550 cfs within its banks and an additional one foot of freeboard. In the event that a 500 -year flood occurs (1,700 cfs, according to FEMA Flood Flows), the excess flow will spill over the southerly bank and into the adjacent area, rather than impact the Forward Landfill. The South Fork of South Littlejohn’s Creek alignment is also a very flat gradient, 0.0006 feet per foot; therefore, erosion is not a significant concern. Evaporation. The estimated annual evaporation for the site is 78.43 inches based on Pan A evaporation data recorded between 1919 and 1968 at Oakdale Woodward Dam (Station No. BOO 630500, latitude 37°51'28", longitude 120°52'42", Elevation 215 above mean seal level [amsl]), located approximately 13 miles southeast of the site (California Department of Water Resources, 1979). A minimum mean monthly evaporation of 1.14 inches has been calculated for December and January, and a maximum mean monthly evaporation of 14.69 inches has been calculated for July. Wind. 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 the west-northwest (45.3 percent of the time) and the north (15.9 percent of the time). Calm winds occur 6.9 percent of the time. A wind rose (Figure 9) developed from the Stockton WB Airport station data provides wind direction information. The mean annual wind speed is 8.2 miles per hour. 3.5.4 End Use Forward produces a range of products and markets all of the compost produced by the Compost Facility. Forward is investigating potential uses such as top soil amendments, mulch ingredients, and/or soil conditioners. Material may be produced in both bulk and bagged forms. Some of the product is utilized on-site for soil amendment and/or ADC. Nonrecoverable or nonmarketable residue are not stored longer than 48 hours at the facility. The residues are removed and transferred for disposal at the active working face of the landfill in accordance with 14 CCR, Section 18227(j). 3.5.5 End Product Forward follows a process to ensure that the compost end product is innocuous and free of sharp edges and particles that have the potential to be harmful to human health and safety. The quality of the end product will depend on the product's use. The highest quality end product would be used as top soil amendment. Forward follows the sampling and analysis requirements, as discussed in previous sections, to ensure that all compost products meet