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Recharge Scenario 2— CIMIS Holt and WRCC Tracy Pumping Plant Stations <br />For the combined CIMIS and WRCC stations scenario (Plate 13), the closest WRCC <br />station is the Tracy Pumping Plant (station 049001), located approximately 4.5 miles <br />from the Site. This station is approximately 9.2 miles closer than the CIMIS station, and <br />as a result is anticipated to have more accurate regional rainfall data. WRCC does not <br />track evapotranspiration; consequently, rainfall data from the Tracy Pumping Plant and <br />evapotranspiration data from the Holt station were utilized. Based on the calculation <br />shown, the estimated rate of recharge from percolating waters for vicinity of the Site is <br />determined to be 6.17 inches. <br />Live Oak has selected this scenario for use in the nitrate loading calculation based on <br />the proximity of the Tracy Pumping Plant Station to the project Site. <br />Nitrate Concentration of Recharge Waters <br />The nitrate concentration of the recharge waters was estimated to be 1 mg/L-N <br />(Hantzsche and Finnemore). <br />Quantity and Quality of Domestic Wastewater <br />Mr. Kumar indicated that he plans to place a mobile home on the Site. He is unsure of <br />the number of bedrooms (two, three, or four), as it will depend on the home he <br />purchases. <br />Crites and Tchobanoglous (1998) list a typical flow rate of 50 to 70 gallons per person <br />per day for an individual residence. The San Joaquin County Enviromental Health <br />Department has indicated that maximum flow and double occupancy within each <br />bedroom should be considered for the nitrate loading assessment; as a result, a value <br />of 140 gallons per bedroom per day has been selected (personal communication, <br />January 6, 2017). <br />The maximum daily flow for the Site was estimated to be 280 to 560 gallons per day <br />(gpd), allowing for a mobile home size ranging from two to four bedrooms. A typical <br />residential concentration of 35 mg/L of nitrate as N was selected for the proposed <br />residence (Crites and Tchobanoglous, 1998). <br />The estimated flow values discussed here should not be used for the design and sizing <br />of the septic system. The design and sizing of the septic system should utilize the San <br />Joaquin County Environmental Health Department On-Site Wastewater Treatment <br />Systems Standards which incorporate peak and surge flow factors. The estimates used <br />in the On-Site Wastewater Treatment Systems Standards may be greater than those <br />discussed here. <br />LOGE 1909 Page 10