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2-8 <br />Forward Composting Facility SWT Engineering <br /> Report of Composting Site Information - July 2014 <br />z:\projects\allied waste\forward\resource recovery facility\5 yr permit rvw 2013-14\rcsi 2014\text\sec 2.doc <br />As described above in Section 2.1.5, the composting pad will be constructed of native earth. <br />The permeability of soils below the surface of the composting pad is low. Operations will be <br />suspended, if necessary, during periods of wet weather to prevent damage to the <br />composting pad or the surface will be paved with gravel or asphalt if the economics justify <br />the higher cost. Due to the low-permeability of native soils and depth to groundwater, <br />monitoring of soil moisture is not warranted. In accordance with WDR Order No. R5-2014- <br />0006, the soil in the upper one foot of the composting pad and compost storage pad areas <br />are tested and if necessary, conditioned and compacted to achieve 1 X 10 -5 cm/sec vertical <br />hydraulic conductivity. <br />2.1.7 Leachate Control (14 CCR, Section 17867(a)(12)) <br />Since additional water will only be applied to the compost when necessary for maintaining <br />adequate internal moisture, significant leachate generation is not anticipated. As stated in <br />Section 3.5.3, the site is in a region of net evaporation. Additionally, compost windrows <br />typically form a light crust on the outside, which repels rainfall. The site's drainage control <br />system was designed to handle all runoff from a 25-year, 24-hour storm, including runoff <br />from the compost piles. This system is illustrated in Figure 6 and runoff calculations are <br />attached in Appendix C. <br />a. Leachate Barriers <br />There are no leachate barriers currently proposed for the site. <br />b. Leachate Barrier Locations <br />There are no leachate barriers currently existing and/or proposed for the site. <br />c. Monitoring and Sampling Procedures <br />There are no leachate monitoring and sampling procedures proposed for the facility. Runoff <br />will be collected in a sedimentation basin located in the southwest corner of the site. Runoff <br />will be sampled and monitored to meet pretreatment requirements or the site's Storm Water <br />Pollution Prevention Plan and Storm Water Monitoring Plan depending on final disposal of <br />collected water. <br />d. Leachate Volume <br />As discussed previously, significant leachate generation is not anticipated. <br />e. Treatment, Storage and Discharge <br />Water collected in the sedimentation basin will either be evaporated, used during the initial <br />mixing of the compost, used for dust control, pumped to the on-site leachate evaporation <br />pond, or transported to a municipal treatment works depending on the quality and quantity <br />of collected water. Water used in the initial mixing of the compost will bring the water <br />content of the compost to proper levels. <br />f. Landfill Sites <br />Forward does not plan to locate the Compost Facility on an existing or closed refuse fill area. <br />However, it should be noted that the facility is located on an area permitted for future WMUs <br />at the Forward Landfill.