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It is important to note that all septic systems have a lifespan. This lifespan is dependant on several factors and is therefore difficult to determine. Septic system failure would primarily result from the advanced formation of the biomat 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 biomat bacteria. Since the soils consist of a clay soil fraction, biomat formation may be hastened. A septic tank filter should be installed in the second compartment of the tank to prevent organic matter loading to the leachfield. hi addition, there should be no garbage disposal in the new office building. �/ Deciduous and evergreen plants may be planted near the leachfield to uptake ammonium and nitrate ions. Caution must be applied to prevent serious root infiltration into the leachlines. These two procedures of shallow leachlines (if possible) and plant uptake would theoretically provide a triple nitrate mitigation system of denitrification from the indigenous clay soils, root absorption and plant evapotranspiration. IV. LIMITATIONS The findings, calculations, opinions and conclusions of this report are based upon information from standard engineering and analytical test procedures, contemporary scientific literature and agency consultations. Information in this report is deemed reliable by the sources from where it was obtained. Results of the percolation testing should be assumed to only represent the subsurface conditions encountered in the specific area of testing and not of the entire Parcel area. Our report is based upon current scientific knowledge to assess factors which are extremely variable and complex within the environment. San Joaquin County Environmental Health Department Standards have been employed for the purpose of preparing this study. Therefore,no guarantee or warranty is expressed or implied concerning any aspect of this investigation, or the prevention or mitigation of environmental impact. We appreciate the opportunity to provide this service for you. If you should have any questions regarding to the information contain eport, please contact the undersigned. EDoG Respectfully submitted, �e0d . CyFSy� No. 04675 z CHESNEY CONSULTING '� Expires: 4�l0.OS * !� Don Chesney, R.E.A. CAL r c4a Registered Environm al Assessor#46 8 �j Chesney Consulting