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I <br /> Factors decreasing the groundwater nitrate concentration include denitrification, groundwater <br /> movement(both vertical and horizontal), well pumping and hydraulics, and cleaner water <br /> recharge contributing to a dilution effect. Ifeach of these sources and attenuating factors could be <br /> quantified on a mass balance basis, it may be that nitrate input is now roughly equivalent to <br /> output. Given that agricultural irrigation recharge is the largest single contributor to groundwater <br /> nitrate concentrations, and since the underlying and surrounding land has been farmed for several <br /> decades, it could be assumed that the nitrate concentrations in the underlying groundwater should <br /> be much higher than those observed, if the attenuating factors were not significant. This is <br /> particularly evident with the soil nil ate-nitrogen test results of the sampled depths. The <br /> denitrification potential appears to be a factor due to the clay content. <br /> Adjustments may have to be made to the proposed wastewater management system if unforeseen <br /> conditions such as an increase in wastewater flow volumes dictate. For example, if wastewater <br /> flows are higher than projected in this Study, the septic system may have to be retrofitted with a' <br /> dosing chamber tank and duplex pumps to dose the effluent to the filter bed Monday through <br /> Friday when wastewater flows are expected to be much lower or nonexistent. As referenced, <br /> domestic water use for (lie entire project,and landscape water use, must be kept to an absolute <br /> minimum. Interior domestic water use can be accomplished with low flow toilets/water reducing <br /> aids, the timing of showers, and regularly checking for leaks within the entire plumbing system. <br /> The project plumber and septic system contractor must coordinate on the construction details of <br /> the influent line coming from the Prayer and Meditation Center Reshroons to the 1,200 gallon <br /> septic tank/pump chamber. <br /> To keep organic loading to a mininwm, garbage disposals (grinders) should not be installed in any <br /> kitchen. Additionally, due to the indigenous clay soils, water softeners also should not be <br /> installed. The sodium liberated by water softeners will disperse and deflocculate the clay lattice <br /> soil structure and render the clay soil impermeable. <br /> Page -12- <br />