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Nitrogen Loading Study Report Page 3 <br /> 24754 EAST RIVER ROAD <br /> WKA No. 11306.01 <br /> January 13, 2017 <br /> 5.3 On-Site Sources of Nitrogen <br /> On-site sources of nitrogen are assumed to be limited to the septic systems. Mass balance <br /> calculations are based on four employees for the East Septic System and three employees for <br /> the South Septic System. Water use was determined to be 15 gallons per person per day for an <br /> industrial building with no food cafeteria based on San Joaquin County's Onsite Wastewater <br /> Disposal Standards. Total nitrogen for untreated domestic wastewater typically ranges from 20 <br /> milligrams per liter mg/L to 70 mg/L (Metcalf and Eddy, 2004). <br /> 5.4 Future On-Site Sources of Nitrogen <br /> There are no anticipated future on-site sources of nitrogen to soil and groundwater. <br /> 5.5 Mass Balance of Nitrogen Loading <br /> A summary of the nitrogen mass balance for the Site is provided in Tables 1 and 2. Two cases <br /> were calculated using the high and low estimates (70 mg/L and 20 mg/L) for the amount of total <br /> nitrogen in domestic wastewater. The concentration of total nitrogen in storm water runoff was <br /> assumed to be 1.91 mg/L in both cases. A summary of the high and low estimates is shown in <br /> the tables below. <br /> Table B— Nitrogen Loading (High Estimate) <br /> High Estimate <br /> Source Annual Nitrogen Loading Volume Infiltrated <br /> (poundslyear) (gallons/year) <br /> East Septic System 12.78 21,900 <br /> South Septic System 9.58 16,425 l <br /> Rainfall 66.54 4,180,302 <br /> Annual Total 88.89 4,218,627 <br /> Table C— Nitrogen Loading (Low Estimate) <br /> Low Estimate <br /> Source Annual Nitrogen Loading Volume Infiltrated <br /> (pound*ear) (gallonslyear) ✓ <br /> East Septic System 3.65 21,900 <br /> South Septic System 2.74 16,425 <br /> Rainfall 66.54 4,180,302 <br /> Annual Total 72.95 4,218,627 <br />