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Fand3.) ement of evapotranspiration because of the microscopic soil porosity and capillary erenced pressurized filter bed system utilizing the Infiltrator Chambers is to bee advantage of these favorable surface soil characteristics. mestic well that serves the Prioste's house also provides i ogkion water for the 2.3 acre vineyard in the southern part of the pyepe�ty. The vineyard was planted in July 2005. This well water has been determined to have a boronlconcentration in excess of the vineyard requirements. Consequently, Mr. Prioste isproposing to drill a new, deeper well to obtain water lower in boron content. ygcy pi, Additionally, this area of Tracy has comparatively high nitrate concentrations in domestic wells t� typically near or over the Maximum Contaminant Level of 45 ppm, as was evidenced by the on- site domestic well test results. II. SOIL SUITABILITY STUDY I 0 y A. Surrounding and On-site Septic System Information A revie plication Permits on file with the Environmental Health Department reveals there has beethree pplication for Repairs/Additions to septic systems within the one-half mile radius/ study are o inne Road exclusively. This can be considered a medium-to-high number of Repairs/Additions/Replacements considering that older systems (prior to 1999), seepage pits were / installed in the underlying gravel strata which extraordinarily managed septic effluent flows. Seepage pits and sumps have been banned by the EHD in this southern region of Tracy due to nitrate impact partially originating from these septic system structures. As referenced on the attaches(Site Plan, the existing septic tank for the Prioste's house is located to the west of the house, with the leachlines extending in a southwest direction. No permit was found for this system in EHD files. It is proposed to leave these leachlines "in-place" as replacement Kea for the house in case of future filter bed failure or need of rest. w B. Soil Physical Test Results � P Size Analysis oil testin was conducted on samples retrieved from the two percolation test borings at 24 inches i es in depth. These borings were drilled in the primary disposal area, as denoted on the ite PI Physical testing and analytical chemistry were conducted on the samples obtained, as ed below: \ Particle Size Analysis was done on the two samples by A&L Laboratories of Modesto.'Laboratory tests reveal the United States Department of Agriculture(USDA) soil classifications underlying the proposed filter bed consist of a loam soil at 24 inches in depth and a clay loam at 36 inches in depth. Page -3- Chesney Consulting