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r7A properly sized leachfield area will help ensure stability and guard against leachfield failure. <br /> Failure would primarily result from the advanced formation of a"biomat" or"clogging mat" on the <br /> wetted soil/effluent interface. This mat is composed mostly of aerobic and anaerobic bacteria and <br /> bacterial products consisting of a slime of polyuronides and polysaccharides. If the soil/effluent <br /> interface is well aerated,a variety of soil microfauna such as nematodes and protozoa may digest the <br /> biomat bacteria. Since the subsurface soils consist of a clay soil material,anaerobic conditions will <br /> probably prevail which may hasten leachfield failure. However, a tight clay soil theoretically <br /> promotes denitrification, thus reducing nitrate impact. <br /> [6] LIMITATIONS <br /> The conclusions of this Soil Suitability Study/Nitrate Impact Investigation are based upon <br /> contemporary scientific knowledge to assess factors which are extremely complex and variable <br /> within the environment. Results of the percolation testing should be assumed to only be <br /> representative of the subsurface conditions encountered in the specific area of testing and not of the <br /> entire subject property. <br /> It is our opinion the findings included in this study is a reasonable assessment of the current subject <br /> property and surrounding study area conditions. This opinion cannot constitute a guarantee or <br /> warranty, either expressed or implied. <br /> E� dry f RONHrNr�` <br /> C <br /> Respectfully submitted, <br /> V � N <br /> No. 04675 "� z <br /> VALLEY Ag RESEARCH 6. <br /> Expires: l"y0 <br /> Op CALIFO <br /> Don Chesney, R.E.A. <br /> Registered Environmental ssessor#4675 <br /> 4 <br /> Valley Ag Research <br />