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NZ -AV <br /> • The soils encountered on the property were presumed to be Stockton clay <br /> (with no hardpan) and there appears to be no physical impediment to the <br /> use of seepage pits on the property; <br /> i • Stockton clays have very high adsorption capacity for cations such as <br /> ammonia-nitrogen, and the slow permeability of this soil is likely to result <br /> in significant denitrification. Both processes should result in a minimum of <br /> 25% reduction in the total nitrogen loading estimates presented above; and <br /> • The proposed Phase 1 and 2 expansion of the five acre property will result <br /> in less than 30 lbs N/Acre-year, assuming minimal (25%) reduction of <br /> nitrogen by adsorption or denitrification. <br /> In conclusion, if the septic system expansion uses a similar design to the current <br /> system, employing leach lines and seepage pits which are sized appropriately to accept <br /> the liquid loading rate, the nitrogen loading rate produced by the expanded septic system <br /> is equivalent to leaching agricultural fertilization. <br /> SAC 125.12 13 <br /> DAMES & MOORE <br />