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FNCLUSIONS AND RECOMMENDATIONS ical characteristics under the proposed disposal area reveal a silty clay/clayey silt soilacing permeability with increasing depth,based on the percolation test results. The' tch depth cxhibited faste ercolation than did the 24 inch deep boring. By distribun he effluent through Infiltra r Chambers over the entireshallow filter bed area, the favorable characteristics of the clay surface soils can be taken advantage of through: 1.) Ammonium absorption, 2.) Anaerobic microsites within the clay lattices preventing nitrification and promoting denitrification for nitrification that has occurred, 3.) Unsaturated flow conditions, 4.) Increasing the distance between the soil/effluent interface and the assumed gravel stratum at 8.5 ft, and the depth to groundwater, and 5.) Greater likelihood of pathogen destruction to prevent contamination of the underlying groundwater. 1 I� The nitrate loading calculations indicate an effluent concentration that is below the MCL for drinking water and below the current nitrate concentration in the on-site domestic well water. 1 This determination was made by taking the subject property as a whole, which consists of 3.8 acres, as the area contributing to nitrate formation. It is my understanding that the wine grapes are not fertilized with nitrogen since this would promote vegetative growth, and not the reproductive growth of producing grapes. The current well water nitrogen content is contributing 46 ppm x 0.612 (pounds per acre-foot multiplier)=28 pounds of nitrogen per one acre-foot of water applied. The Prioste's have conveyed that if a large event (all parking spaces to be occupied) is scheduled for their facility, they will use portables (chemical toilets) for these large events. It is important to recognize that all septic systems and disposal areas have a lifespan. This lifespan is unpredictable due to the numerous operational and environmental factors involved. Operational factors include checking toilets regularly to ensure there is no leakage. Environmental factors include biomat buildup that may occur at the soil/effluent interface within the Chambers, which is a naturally occurring process. Biomat buildup is typically managed by allowing the filter bed to rest and rehabilitate naturally. i It is imperative that no chemicals used in the wine-making process, other than low concentrations of household cleaners be introduced into the septic system. The grass ground cover over the disposal areas will need irrigation during the spring and summer months. However, care must be given to the amount of water applied so as to not inundate the system. It is recommended to irrigate with"impact-type" sprinkler heads during the night. If irrigation is needed during the hottest summer days, the irrigation system should activate several times for short durations. Nitrogen fertilizer should not be applied to the filter bed s�ground cover area. Page-11- Chesney Consulting