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04 November 2019 AdvancedGeo <br /> AGE Project No. 19-4819 Environmental <br /> Page 5 of 5 .MM'VG. <br /> 9.7. IMPACT OF NITROGEN LOADING FROM SITE PROJECT TO <br /> DOWNGRADIENT WATER SOURCES <br /> The recharging of groundwater is the most likely potential feature that could impact future <br /> nitrogen loading. Since the subject property is flat, AGE does not anticipate percolating <br /> effluent will affect any nearby water sources. Based on the volume of wastewater to be <br /> generated, the potential vertical migration would not likely degrade the local groundwater. <br /> A total of 17.98 parts per million (ppm) of additional nitrogen is estimated to be added to <br /> the site over the long term through waste water recharge from the existing and proposed <br /> septic systems. The nitrogen loading value is above the desired value of 10 ppm. <br /> 10.0. TOTAL NITRATE IMPACT FROM PROPOSED PROJECT <br /> Based on the method and assumptions described, proposed NO3_N mass of wastewater <br /> and the calculations of the NO3_N loading predicted, the existing and proposed <br /> development may impact NO3_N loading rates within the aquifer. The soil at the site <br /> appear to be adequate for nitrate degradation and proper leaching of wastewater. A total <br /> of 17.98 ppm of additional nitrogen is estimated to be added to the site over the long term <br /> through waste water recharge from the existing and proposed septic systems. <br /> If you have any questions or require further information, please contact our office at <br /> (800) 511-9300. <br /> Sincerely, <br /> Advanced GeoEnvironmental, Inc. <br /> AMi�� <br /> 2 <br /> No.8574 Q ' <br /> Brian <br /> W. Millman �P Daniel J. Villanueva <br /> Senior Geologist `'� FCA111 Senior Geologist <br /> California Professional Geologist No. 8574 <br />