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RECOMMENDATIONS AND MAINTENANCE A maintenance program must be established for the entire septic system. However, this ca7fully accurately assessed, quantified and implemented until the project is completely built-out a occupied. As referenced, predicting lift station tank pump-out intervals is impossible beca unknown as to the number of people on-site at any given time, and the composition of influent. Both these unknowns lead to changes in the quantity, quality and operational parameters of the proposed septic system. For example, it may be that solid waste and influent flow is greater than anticipated for the capacities of the lift stations. This scenario could happen if a tenant(s) has several female employees/customers, or if a tenant(s) is a high water user. If this occurs, the original lift station tanks may have to be replaced with higher volume capacity, custom-built tanks. If in the future, such tenants should occupy the Ice House, Chesney Consulting must be notified so that adjustments can be made, if any. It is anticipated to have the lift station tanks pumped yearly, or after analyzing scum and sludge thicknesses. Improper septage pumping of particularly the lift station tanks may also contribute to buoyancy. When lift station tank contents are pumped, one-third of the tank contents should remain in the tank for ballast. The"clear zone"between the floating scum and the sludge at the bottom of the tank should be pumped. This will allow the scum and sludge to remain and rapidly promote microbial degradation and decomposition on incoming influent. Caution must be given to the buoyancy potential of the tanks, due to the potentially high groundwater table. This is particularly true for the lift station tanks since they may be placed deeper into the ground than the tanks located next to the filter beds. For this reason, the invert of the influent tightlines entering the lift station tanks cannot exceed 48 inches below existing grade, and should be as shallow as possible. If free groundwater, or the capillary fringe is encountered during tank emplacement, Chesney Consulting must be contacted to assess the situation. A six-inch bedding layer of sand (does not have to be washed) must be placed on the floor of each of the five septic tank excavations. The second maintenance issue will be the washing off a BioTube filt periodically,preferably at tank pump-out. A water line with a hose bibb should be'm a each lift station location for filter maintenance. At the time of infiltrator emplacement, the soil-effluent interface must be scarified to open the clay soil-effluent interface. Clean, washed sand must be laid down over this scarified surface soil compaction. Clean-outs must be installed at the distal ends of each lateral through what is referred to as"tum- ups" as noted on the plan schematics. By using a long"bottle-brush" arrangement, the interiors of the laterals can be cleaned of scum and slime build-up. 19 Chesney Consulting