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\..00 \.s <br /> F <br /> .6) The samples were placed in a cooled ice chest and transported the following day <br /> sin Stockton. Sampling information is described on the attached Chain of Custody <br /> pendix B. <br /> . ) ater analysis results reveal a high nitrate concentrations in both the domestic well at 50.4 <br /> ppm and the ag irrigation well at 59.1 ppm (both as nitrate -NO3). The Maximum Contaminant <br /> Level (MCL) for nitrate in drinking water is 45 ppm. DBCP was found to be Non-Detect (ND) in <br /> the domestic well. A summary of the test results are illustrated in Table 2, below. <br /> /(§4.2) Considering the area has been intensely farmed for the past several decades, a much higher <br /> nitrate concentration would have been expected in the two tested wells, and is a reflection of <br /> excellent farming practices by the Stokes Farming Company since they have conducted farming <br /> operations for several decades. <br /> TABLE 2 <br /> WELL WATER ANALYSIS <br /> WELL ANALYTE CONCENTRATION MAXIMUM CONTAMINANT LEVEL. <br /> FOUND (MCL) CY; <br /> Domestic Well Nitrate(As Nitrate) � 50.4 ppm� 45 ppm <br /> DBCP Non-Detect-ND 0.2 µ/L <br /> Ag Irrigation Nitrate(As Nitrate) 59.1 ppm X 45 ppm <br /> Well <br /> DBCP Well Was Not Tested for <br /> DBCP Per EHD <br /> (§ 7.0) CONCLUSIONS <br /> !/ The pere test results for proposed Parcel 1 show acceptable percolation for the management of <br /> anticipated septic system effluent flows. It is my understanding that effluent management from the <br /> new residential structure will occur through a filter bed system to reduce the disposal area foo rint. <br /> Due to the encountered cemented silts hardpan, consideration may� igiilgSbfilYer <br /> bed 10% Oo/ However, this would be dependant upon anticipated effluent flows. If flows are <br /> projected to be light, then this should be unnecessary since there is more than ample area for <br /> expansion in the event of inundation or failure. As noted from the perc test results, as the soil <br /> becomes saturated, the percolation potential decreases, which is regularly observed. <br /> The underlying soils below 42 inches appeared to possess slightly decreasing moisture content with <br /> increasing depth, as observed in the backhoe test pit. This may be due to the low rainfall totals that <br /> have occurred this past winter. High moisture content soils are beneficial for the suppression of <br /> nitrification, and the promotion of denitrification of nitrate molecules that may have formed through <br /> nitrification in the upper soil environments. <br /> Page-5- <br /> Chesney Consulting <br />