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Additionally, deciduous plants should not be irrigated in the winter or they may drown. Scientific <br /> studies have indicated that leachfields in clay soils may rejuvenate when allowed to "rest." This <br /> should be a design consideration whereby one-half of the leachfield can rest during the winter <br /> months to prevent inundation of the landscape plants, then switch during spring and summer when <br /> irrigation is needed. <br /> The platy soil structure at the excavated elevation for Chamber emplacement (-18 inches below <br /> existing grade) must.be re-arranged 6 inches with the backhoe teeth. Two to three inches of a <br /> sand material is to be placed on this disturbed soil to bred the Chambers at an equal elevation. <br /> ourl Mo six inc"°FhT ssoo a san oam shall be laced over thei'ame�TROT landscape grass <br /> p lantb-d an"tip ` <br /> It is our opinion that the existing leachfield should not be removed, or refurbished. It should be <br /> left as existing to rehabilitate naturally. This leachfield can be thought of as a manure <br /> containment pond that undergoes clean-out procedures. During these procedures, the underlying <br /> soils become aerated, thus promoting nitrification. Since this existing leachfield will be used <br /> Sufficient data has been collected and analyzed to determine that the water table is currently an <br /> acceptable distance below grade forthere to be adequate biological treatment, according to <br /> published scientific literature. <br /> Accurate `,`as-builts" of the septic system to be installed in the future must be supplied to the <br /> Environmental Health Department and all applicable "distance"requirements must be strictly <br /> adhered to. <br /> ;i <br /> It is important to recognize that all septic systems and disposal areas have a lifespan. This <br /> lifespan is unpredictable due to the numerous operational and environmental factors involved and <br /> may be very short (several months) or comparatively long (several years). Clean-outs must be <br /> installed at the distal ends of each lateral. By using a long"bottle-brush" arrangement, the <br /> interiors of the laterals can be cleaned of scum and slime build-up. Biomat buildup that will occur <br /> at the soil/effluent interface within the chambers is a naturally occurring process that is typically <br /> managed by allowing the filter bed to rest and rehabilitate naturally. Biomat decomposition may <br /> be accelerated by pumping air into the disposal system piping of a resting filter bed. <br /> Il <br /> 16 <br /> Chesney Consulting <br />