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rtheon rate of 12.8 minutes per inch obtained from the Double Ring Infiltrometer test has been gn purposes, since this test is the most accurate in determining an application rate and was servative result. This rate is equivalent to an effluent acceptance rate of 0.757 as published in various scientific literature (e.g., California SWRCB Guidelines for the llation and Operation of Mound Sewage Disposal Systems.) Certain appurtenances change the characteristics of the wastewater effluent such as filters within septic tanks and kitchen food-waste grinders. If there is to be a kitchen area within any of the proposed Businesses, disposals or food waste grinders should only be installed with consent from MicroSepTec. A higher organic matter flow from food grinders may be beneficial for the denitrification process. It is imperative that no pool chemicals (e.g., chlorine, muriatic acid, etc.), solvents or petroleum products, other than very low concentrations of household cleaners be introduced into the wastewater treatment system. Additionally, if there is to be any food production,preparation or processing facility in any of the buildings at any time in the future, a grease trap(interceptor tank)must be installed before this waste stream enters the EnviroServer. The MicroSepTec EnviroServer tank along with the filter bed must be installed as early as possible during the course of construction. Additionally, it is our understanding there will be model pools northwest of the disposal areas. A 10 foot setback must be maintained between the disposal areas (primary and 100%replacement) and the model pools. The soil profile appears to contain a higher-than-expected clay content of 12%. This should be sufficient to impede saturated flow conditions of percolating effluent down to the groundwater. However, it will be the determination of EHD whether to install an ultraviolet(UV) light disinfection system in the EnviroServer ES25 to prevent potential fecal coliform contamination of the groundwater. The source of the nitrate observed in the top groundwater may have originated from various sources. These include mineralization of root material from on-site shrubs and trees where nitrification could readily occur. Referring to the groundwater directional flow, a defunct dairy to the northeast of the subject property may also have contributed to the nitrate concentration observed in the top groundwater. However, groundwater flow under this dairy appears to be cross gradient to the property. Possibly the greatest nitrate contribution may have come from the on-site septic system. As noted on the installation permit for the this septic system found in the Appendix, the leachfield was upgradient from the test boring from where the groundwater sample was taken. It is important to recognize that all wastewater disposal systems and disposal areas have a lifespan. This lifespan is unpredictable due to the numerous operational and environmental factors involved. Clean-outs have been specified at the distal ends of the laterals. By using a long "bottle-brush" arrangement, the interiors of the laterals can be cleaned of biological slime build-up. Biomat buildup that will occur within the gravel bed and particularly at the soil/effluent interface is a naturally occurring process that is typically managed by allowing the filter bed to rest and rehabilitate naturally. Biomat decomposition may be accelerated by pumping air into the disposal system piping of a resting filter bed. Page-11- Ckesnq Consulting