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It is important to recognize that all septic systems have a lifespan, which is dependant on several factors and is difficult to determine. Septic system leachline failure may 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. The majority of subsurface soils under the property consist of silty, fine sands. Consequently, there will be a greater opportunity for oxygen intrusion from the atmosphere. This will theoretically assist in biomat degradation. The second factor for leachline failure would be of course, root intrusion into the leachline piping, as was observed. The subject site will continue to be productive farmland, and is surrounded by properties that engage in production agriculture. Consequences of this land use include: noise, dust, odors, insects, machinery, crop dusting aircraft, trucks, exhaust and other environmental effects that may be offensive to some people. It is recommended that bottled water be used for drinking and cooking purposes in agricultural areas. 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 location 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. The opportunity to provide this service for you is appreciated. If there should be any questions regarding the information contained within this report,please contact the undersigned. kn"A . Respectfully submitted, CHS�\Lyme (§ 7.11))jCyH�ESNEY CONSULTING No. 04675 z * Expires: 6- / Don Chesney, R.E.A.- I Registered Environmental Assessor#4675 °p' Ca10.1� Agricultural Pest Control Advisor#6237 Page-5- Chesney Consulting