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l� It is my understanding that a Cemetery may be constructed south of the subject property, which will be upgradient to all or part of the subject property. There have been studies which have shown increased nitrate levels in groundwater under cemeteries due to decomposition. It will be the recommendation of EHD to install a specified grout seal of 100 ft, 150 ft, or 200 ft for any proposed well to serve a residential structure, if the cemetery is definitely to be constructed. 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 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. Since the shallow surface soils consist of a fine-grained soil material (primarily silts and clays), anaerobic conditions may prevail over time because of oxygen diffusion difficulty. This may decrease the expectant life of each leachfield. If the leachlines are installed high in elevation, there may be a greater opportunity for oxygen infusion from the atmosphere, thus theoretically assisting in biomat degradation, along with promoting evapotranspiration. VII. LIMITATIONS The findings, testing, 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 as denoted on the Tentative Map, and not of the entire proposed area for each individual Parcel. This 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 Sewage 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, the prevention of environmental impact, or related issues. We appreciate the opportunity to provide this service for you. If there should be any questions regarding the information contained within this report,please contact the undersigned. Respectfully submitted, w. CHESNEY CONSULTING No. 04e75 Expire. Don Chesn R.E.A. - I ., ,.. Registered Environment Assessor##46751 011" CA Agricultural Pest Control Advisor#6237 Page -11- Chesney Consulting