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19 May 2021 AdvancedGeo Project No. 21-6435 An Employee-Owned Company Page 12 of 14 Proposed Commercial System 120 gpd x 260 days of proposed operation _ 7.48 gallons per cubic foot = 4,171 cubic feet of wastewater. The total wastewater volume for proposed project will be 17,079 cubic feet of wastewater (existing) + 4,171 cubic feet of wastewater (proposed) = 21,250 cubic feet of wastewater. Does not account for evapotranspiration likely to occur. NW = Total nitrogen concentration of wastewater at 45 mg/L-N based on the average discharge. Accounting for the loss of mg/L-N in the septic tank at 15% = 45-15%= 38.25 and the loss from the biomat at 10% 38.25 - 10% = 34.425 mg/L-N. d = Fraction of nitrogen concentration removed from the wastewater due to denitrification within the soil (25 percent for silty sand soils). R = Estimated Deep percolation / average rainfall recharge rate per year: 11.78 inches. Nb = Background nitrate-nitrogen concentration of rainfall recharge: 1.0 mg/I. The Nb is an average value determined for San Joaquin County by the EHD. EXISTING AND PROPOSED HOME CALCULATIONS: Nr = I x Nw (1-d) + R x Nb = (I+R) Assumptions: = 158,950 gallons = 21,250 cubic feet wastewater _ [(0.811 acres x 43,560 feet2) _ 12 inches] = 21,250 = 2,944 = 7.21 inches/year NW = 34.425 mg/L-N d = 25 percent denitrification R = 11 .78 inches/year Nb = 1.0 milligram per liter Nr = [7.21 inches/year x 34.425 mg/L-N (1-0.25)] + (11.78 inches/year x 1.0 milligram per liter) - (7.21 inches/year + 11.78 inches/year) Nr = 186.15 _ 18.99 = 9.80 Nr = 9.80 ppm nitrogen (NO3_N) 9.7. IMPACT OF NITROGEN LOADING FROM SITE PROJECT TO DOWNGRADIENT WATER SOURCES The recharging of groundwater is the most likely potential feature that could impact future nitrogen loading. Since the subject property is relatively flat, AGI does not anticipate percolating effluent will affect any nearby water sources. A total of 9.80 ppm of additional