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01 November 2021 AdvancedGeo <br /> An Employee-Owned Company <br /> Project No. 21-6435 ' -- <br /> Page 3 of 3 <br /> d = Fraction of nitrogen concentration removed from the wastewater due to denitrification <br /> within the soil (25 percent for loamy soils). <br /> R = Estimated Deep percolation / average rainfall recharge rate per year: 11 .78 inches. <br /> Nb = Background nitrate-nitrogen concentration of rainfall recharge: 1.0 mg/I. The Nb is <br /> an average value determined for San Joaquin County by the EHD. <br /> COMMERCIAL CALCULATIONS: <br /> Nr = I x Nw (1-d)+ R x Nb - (I+R) <br /> Assumptions: <br /> I = 31,200 gallons = 4,171 cubic feet wastewater - [(0.811 acres x 43,560 feet') - 12 <br /> inches] = 4,171 _ 2,944 = 1.42 inches/year <br /> NW = 85 mg/L-N <br /> d = 25 percent denitrification <br /> R = 11.78 inches/year <br /> Nb = 1.0 milligram per liter <br /> Nr= [1.42 inches/year x 85 mg/L-N (1-0.25)] + (11.78 inches/year x 1.0 milligram per liter) <br /> (1.42 inches/year + 11.78 inches/year) <br /> Nr = 102.3 _ 13.20 = 7.75 <br /> Nr = 7.75 ppm nitrogen (NO3_N) <br /> A total of 7.75 ppm of additional nitrogen is estimated to be added to the site over the <br /> long term through wastewater recharge from the proposed septic system. <br /> If you have any questions or require further information, please contact our office at <br /> (209) 467-1006. <br /> Sincerely, <br /> AdvancedGeo, Inc NA <br /> aQoQPN W M��°<o <br /> �yc�� <br /> m � <br /> No.8574 <br /> Brian W. Millman <br /> Senior Project Geologis ST�TFOFCAt�FCP�\P <br /> California Professional Geo o. 8574 <br />