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r�The domestic well is proposed to be drilled northwest of the disposal area, which is downgradient, or possibly crossgradient to the leachfield. The separation distance between the well and the l�eachline�s will be approximately 140 ft, and 185 ft from the seepage pits. It will also be at the discretion of EHD to test the future well for the agrichemical DBCP and nitrate. It is important to recognize that all septic systems have a lifespan, which is dependant on several factors and is therefore difficult to determine. Leachline 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 subsurface soils on the property consist of cemented sands, silts, and some clays, anaerobic conditions may prevail over time which may accelerate biomat formation. As referenced, the deep septic system structures will manage the majority of effluent volume. Biomat formation will occur over time in these structures. In unsewered areas and/or areas that have been, or currently are under agricultural production, it is highly recommended that bottled water be used for drinking and cooking purposes. 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 preliminary Plot Plan, and not of the entire subject Parcel land area. 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. I appreciate the opportunity to provide this service for you. If there should be any questions regarding the information contained within this report, please contact me. AAA 4t Respectfully submitted, �/o_ SHF (§ 7.1) CHES>FY CONSULTING 4k � No. 04675. � Don Chesney, R.E.A.- * Expires: G 3i•GG x Registered Environm ntal Assessor#4675 N„ �P Page- -01V CALI Chesney Consulting