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Frfoundatironmental Health Department within this locale, it is evident that septic systems have a definite lifespan due to the indigenous clay soils. achline failure would primarily result from the advanced formation of a"biomat"t" 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. Since the shallow subsurface soils consist mostly of clay soil material, anaerobic conditions will prevail over time which may hasten leachfield failure. However, if the leachlines are installed high in elevation, there will be a greater opportunity for oxygen intrusion from the atmosphere, thus theoretically assisting in biomat degradation. As noted on the Leachline Requirement Map published by the Environmental Health Department, the subject property is in the "High Water Table Areas." The map shows that sumps or seepage pits are not allowed in this area. The nitrate concentrations determined in the underlying groundwater suggests there apparently has not been impact to the deeper aquifers from upgradient agricultural inputs or septic system influences. As noted on the attached older USGS map, there is a residential subdivision upgradient from the subject property which may be contributing to the nitrate concentration observed in the top aquifers. Regardless of the nitrate concentration of any well water in rural areas, it is recommended that bottled water should always be used for drinking and cooking purposes. According to the Environmental Health Department, on April 2, 2002, steam cleaning of tractors and vehicles was observed. The EHD has stipulated that prior to recordation of the Parcel Map, this wash material must be plumbed through a sand/oil separator and discharged to an above- ground system approved by EHD. Otherwise,the washing of engines, transmission, etc. or any other parts that contain oil, grease, etc. must cease and desist. Mr. Pereira has stated that the steam cleaning of engines, transmissions, etc., or any other parts which contain oil and grease will cease and desist. However, the washing of tires, wheels, cabs, implements,tools, etc. may be done for the following reasons: It is very common for there to be dust, soil, mud and plant parts which adhere to tractors, other types of farm vehicles and implements. This dust, soil, etc. may contain adverse constituents that must not be transferred from one field to another. These adverse constituents may include nematodes, weeds, weed seeds, or other types of pests; or agrichemicals such as herbicides. Therefore, the exterior washing of farm vehicles and implements must continue and is legal,to prevent the transfer of these constituents from field to field. Page -4- Chaney Consulting