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; t <br /> Soil Suitability&Nitrate Loading Study Page 12 <br /> St. Patrick's'Church, Escalon, CA <br /> Project No. 607.1 <br /> ( } August 31, 2009 <br /> concentrations in excess of the MCL limit at the uppermost layer of groundwater . <br /> -- as summarized below: <br /> r—. <br /> System <br /> of MCL <br /> (7 Perm Res. 23 <br /> .. � <br /> Proposed 20 <br /> TOTAL 43% <br /> li 1 r From the laboratory sample, the well water contain -' o to a itra <br /> This is equivalent to 51 percent of the MCL limit. ombining the well nitrate <br /> with the calculated septic loading yields the resul 1 rate <br /> F concentration (background + septic load) is 94% of the MCL nitrate load. <br /> e <br /> Both systems combined result in a nitrate level at the groundwater surface less <br /> than the MCL limit. This calculation does not, however, consider the dilution <br /> that occurs as newly introduced water mixes with the deeper groundwater. The <br /> calculated groundwater concentrations offer a "worst case" estimate, which is <br /> unlikelyto bre <br /> e representative entative of actual groundwater conditions. I <br /> The nitrate introduced from the current and proposed systems will move <br /> # through the groundwater as it flows. As the groundwater flows, the somewhat <br /> elevated concentration of nitrate at the groundwater surface that results from <br /> F11 the on site septic systems will rapidly decrease through dispersion. It is unlikely <br /> that more nitrate attributable to the on site septic systems will be detectable <br /> F. beyond the down gradient limits of the property. <br /> F <br /> I <br /> Fi <br /> ,i <br /> 2937 Veneman Ave.,4B240 <br /> Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto, CA 95356 Fax: (209) 569-0295 <br /> r <br /> . i <br />