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7Asstated above, EHD requires there be sufficient distance for"treatment" of septic effluent before it encounters the groundwater table. This distance is normally regarded to be five feet in leachlines and 10 feet with seepage pits and sumps. Therefore, sufficient distance exists between the bottom of a maximum depth seepage pit and the current groundwater depth of 70 feet. §6.7 and §6.8. No problems are anticipated for any future septic system on the property, other than typical lifespan concerns. Engineered septic systems will not have to be installed for this proposed subdivision, unless there are continual failures on either of the Parcels. Any new septic system must have at least a 50% standby replacement area incorporated into the design of the system. All related septic system structures and the new domestic wells must comply with the published "distance" requirements from property borders, roads, irrigation fields and irrigation ditches, etc. It is important to recognize that all septic systems have a lifespan, which is dependant on several factors and is therefore difficult to determine. Septic system leachline failure would primarily result from the advanced formation of a "biomat" or"clogging mat" on the wetted soil/effluent interface. This mat is composed mostly of aerobic and anaerobic bacteria and bacterial products consisting of a slime of polyuronides and polysaccharides. If the soil/effluent interface is well aerated, a variety of soil microfauna such as nematodes and protozoa may digest the clogging mat bacteria. The shallow soils consist of hardpan and clayey soils. As evidenced by the number of Repairs/Additions on Steinegul Road, this has had a serious negative effect on septic system longevity in this locale. Consequently, deeper septic system structures (sumps or seepage pits) will manage most of septic system effluent volumes. i Page -5- Chesney Consulting