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collected in a clean, dry, stainless steel bowl, then decanted into a plastic container and <br /> placed on ice for transport. <br /> Nitrate was detected in the May 17 sample at a concentration of 0.4 mg/L-N and in the <br /> May 19 sample at a concentration of 0.2 mg/L-N. The laboratory analytical results are <br /> attached as Appendix 5 o'Wis report. Live Oak then averaged the concentrations of the <br /> two samples, for a value of 0.3 mg/L-N to represent the nitrate concentration of rain. <br /> Because the San Joaquin County Environmental Health Department has requested that <br /> local and recent data be utilized wherever possible, the concentration of the Lodi <br /> rainwater been selected for use in the nitrate loading calculation. <br /> Quantity and Quality of Domestic Wastewater <br /> Mr. Workman indicated that a five-bedroom home will be constructed on the Site. The <br /> existing home has two bedrooms. <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 Environmental 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 b�__gallons per day (gpd), <br /> based on seven bedrooms at 140 gallons per bedroom. <br /> A typical residential concentration of 35 mg/L)of nitrate as N was selected for the <br /> proposed 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 /> Denitrification Reductions <br /> Denitrification is a process that occurs in the septic system drain field whereby certain <br /> bacteria oxidize the nitrate (NO3) in the wastewater and release nitrogen gas (N2) to the <br /> atmosphere. Due to the biologic processes in the shallow soils, nitrogen in the drain <br /> field will may undergo a reduction between 10 percent to 35 percent. Soils with higher <br /> clay content, moist soil conditions, high pH, and organic material denitrify by about 35 <br /> LOGE 1931 Page 10 <br />