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It is important to note that all septic systems have a lifespan, which is dependant on several factors <br /> and is therefore difficult to determine. Septic system leachline failure would primarily result from <br /> the advanced formation of a"biomat" or"clogging mat" on the wetted soil/effluent interface. This <br /> mat is composed mostly of aerobic and anaerobic bacteria and bacterial products consisting of a <br /> slime of polyuronides and polysaccharides. If the soil/effluent interface is well aerated, a variety of <br /> soil microfauna such as nematodes and protozoa may digest the clogging mat bacteria. <br /> Since the shallow and deeper subsurface soils consist of a fine-grained soil material (silts and clays), <br /> anaerobic conditions may prevail over time which may decrease the expectant life of the leachfield. <br /> If the Infiltrator leachlines are installed high in elevation, there will be a greater opportunity for <br /> oxygen intrusion from the atmosphere,thus theoretically assisting in biomat degradation, along with <br /> promoting evaporation/evapotranspiration. <br /> Regardless of the nitrate concentration ultimately tested for in each of the new domestic wells, <br /> bottled water should always be used for drinking and cooking purposes. <br /> LIMITATIONS <br /> The findings, testing, opinions and conclusions of this report are based upon information from <br /> standard engineering and analytical test procedures, contemporary scientific literature and agency <br /> consultations. Information in this report is deemed reliable by the sources from where it was <br /> obtained. Results of the percolation testing should be assumed to only represent the subsurface <br /> conditions encountered in the specific area of testing as denoted on the Tentative Map, and not of <br /> the entire proposed area for each individual Parcel. <br /> Our report is based upon current scientific knowledge to assess factors which are extremely variable <br /> and complex within the environment. San Joaquin County Environmental Health Department <br /> Sewage Standards have been employed for the purpose of preparing this study. Therefore, no <br /> guarantee or warranty is expressed or implied concerning any aspect of this investigation,the <br /> prevention of environmental impact, or related issues. <br /> We appreciate the opportunity to provide this service for you. If there should be any questions <br /> regarding the information contained withip jjuss rreport, please contact the undersigned. <br /> �• :: .`�p. C NccS <br /> Respectfully submitted, <br /> No.00475 <br /> CHESNEY CO SULTING f Exptrea, j" o J� <br /> GwLtto�A <br /> Don Ch sney, R.E.A <br /> Registered Environmental Assessor#4675 <br /> Page-5- <br /> Chesney Consulting <br />