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Sufficient soil and groundwater data has been collected and analyzed to determine that the water <br /> table is currently an acceptable distance below grade for there to be adequate biological treatment, <br /> according to published scientific literature. Mounding effects under the leachfield should be of no <br /> concern since the saturated zone is approximately 95 ft below grade. <br /> It is important to recognize that all septic systems have a life span which is dependant upon several <br /> factors, and therefore difficult to determine. As documented with percolation tests, the surface and <br /> deep subsurface soils under the subject facility are acceptable for the management of septic system <br /> effluent for an incalculable period of time. A 100%replacement area has been designated in the <br /> event a repair is needed, or an additional system installed. This area is immediately to the west of <br /> the proposed septic system. <br /> The on-site domestic well will be 800 ft downgradient from the new leachfield. Although it may <br /> E. take several years for the effluent to reach the water table, we recommend periodic monitoring of <br /> this well. Testing should include analysis for nitrate and chloride concentrations, which should <br /> also be helpful in determining any needed changes to the fertilization program. <br /> Potential nitrate-nitrogen loading will be alleviated by using a 2,000 gallon septic tank and a filter <br /> (e.g., Zabel® or OSI®Filters)placed in the second chamber of the septic tank. This will trap an <br /> additional 10-20%nitrogen from escaping out to the leachfield and seepage pits. A denitrification <br /> potential of 30% is projected within the soil environment due to the referenced soil characteristics <br /> of silty clays, clayey silts. <br /> Although rainfall has been factored into the nitrate loading equation, irrigation recharge is more <br /> significant in this location for creating a greater potential for nitrate-nitrogen impact to the <br /> underlying aquifer. Irrigation of the Foppiano walnut orchard will be by solid set sprinklers; <br /> therefore,the application of irrigation water can be closely monitored. <br /> Accurate "as-builts" of the septic system to be installed in the future must be supplied to the <br /> Environmental Health Department and all applicable "distance" requirements must be strictly <br /> followed. <br /> t <br /> 12 <br /> VafCey dig Research <br />