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_ characteristics. Ultimately, the effluent enters the shallow groundwater where a potentially detrimental phenomenon occurs. This is known as "mounding." Since the zone of saturation is also composed of a fine grained, clayey material,the hydraulic conductivity of the saturated zone is also low. Consequently, this zone cannot manage the influx of effluent as quickly and efficiently as a coarse grained material such as sand; the effluent backs-up and creates a mounding effect which can potentially cause effluent surfacing. If the Church Parishioners were to meet only on Sundays and possibly Wednesday evenings, the remaining days of the week should allow enough time for the system to "rest" and complete its intended function. But if the possibility exists that there may be daily on-site activity at the Church, then it is our opinion mounding could create a significant problem. Therefore, we are recommending an economic analysis be conducted between the cost of the traditional, mound septic system with its potential for environmental impact and failure, with an on- site wastewater or "package" treatment plant in which the wastewater may be discharged off-site. It may be possible to reach an agreement with the South San Joaquin Irrigation district to discharge directly into their irrigation/drainage ditch, located on the east property border. It is our understanding City of Tracy water and sewer may extend to the subject property within ten _ years, since it is approximately one mile to the east at present. If this is the case, then leasing a package treatment plant may be an economically attractive option. If the Church elects to proceed with the traditional mound septic system, it will be a requirement of the Environmental Health Department that the entire septic system for the project be operated under a yearly permit with periodic inspections. Additionally, there should be periodic assessments and analyses made of the leachfield clogging mat, groundwater mound formation and monitoring _ of downgradient wells for possible nitrate, chloride and bacteriological impact. This may require installation of monitoring wells. The septic tanks should be pumped on a regular basis, which will be dependant upon usage. The sewage contractor must notify the Environmental Health Department in writing of any observed abnormalities. All related septic system structures such as tight-lines, septic tank, and leachlines must conform to the applicable distance requirements as promulgated in the San Joaquin County Health District Codes. 9 Valfey Ag P(search