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• Conduct soil physical and chemical testing for determination of the following:.Physical <br /> testing included percolation testing, backhoe trench infiltration testing, and particle size <br /> analysis of the soil permeability characteristics underlying the potential effluent disposal <br /> areas. Chemical testing included analyses for constituents that influence nitrate loading. <br /> • Water table analysis of the water table underlying the proposed chambered filter bed <br /> location was conducted. Water table analyses established a baseline concentration of the <br /> tested constituents, and the capacity for nitrate loading.' <br /> Mounding Analysis potential was estimated under the proposed disposal area to ensure <br /> sufficient treatment distance remains between.the soil/effluent interface and the highest <br /> to <br /> anticipated depth groundwater. A <br /> p p g calculated estimate indicates an acceptable distance <br /> will be maintained. <br /> • The required 100%reserve/replacement area for.the primary leachfield can be easily <br /> situated directly north and west of the primary.disposal area, within the existing vineyard. <br /> • Although ultimate wastewater flow volumes emanating from the completed project are <br /> unknown, primarily due to changes in the number of employees:throughout the year, a <br /> maximum.Average Daily Flow(ADF) volume was formulated using all available <br /> parameters'-acceptable to EHD. <br /> /At-the time of'soil field-testin , two.locations were'tested;for potential siting of the new disposal <br /> g p g <br /> area. Soil test results were compared between these two locations. Testing was done in what is <br /> referenced in this report as-the "potential east side disposal area" and the "potential west side <br /> disposal area. These east and west side test sites are'in relation to an existing single family <br /> residential structure;.near Jacob Brack Road. It has subsequently-been decided based„on the <br /> findings of these studies;to install the new wastewater disposal area an the west side of this <br /> E . <br /> residential structure, in a portion.o f an existing vineyard whisk will be removed <br /> In summary, this investigation has found the indigenous soils under the future domestic wastewater <br /> disposal areas to contain a loam soil type, predominately a sandy loam;with significant hardpan <br /> characteristics. Denitrification potential within the soil profile.appears,to be indeterminable based <br /> on.the nitrate-nitrogen analysis. However, from nitrate analysis of the two water table analyses, it <br /> appears that greater nitrate-nitrogen concentration within the soil profile has led to a higher nitrate <br /> concentration in the water table. Due to variability in the percolation test results and the presence <br /> of underlying hardpan, a six-celled, chambered filter bed arrangement is proposed, with a pressure <br /> dose system to equally distribute the effluent over a large disposal area. <br /> .2 <br /> Chesney Consulting <br /> i <br />