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12172 N Hibbard Road Project No.2021-00063 Page 16 <br /> 5.4 Future On-Site Sources of Nitrate <br /> 5.4.1 Quantity and Quality of Domestic Wastewater from Proposed Project <br /> The following discussion is for determining the long-term wastewater flow anticipated from <br /> the planned residential house for the site,to be incorporated into the nitrate loading analysis. <br /> The anticipated wastewater flow determined is not intended to be used for septic system <br /> design, because septic system sizing includes a peak use factor, whereas the numbers <br /> discussed herein are based on a long-term conservative measure of estimated effluent <br /> volume. <br /> There is currently a 3-bedroom residence with associated septic system onsite. In addition, <br /> a proposed 3-bedroom, 2-bath secondary dwelling unit with a separate septic system is <br /> planned for the site. Per San Joaquin County Environmental Health requested guidelines <br /> based on previous nitrate loading studies, an average daily flow of 100 gallons for the first <br /> bedroom and 50 gallons for each additional bedroom per residence per day is estimated for <br /> the site. The following table presents the nitrate contributing septic wastewater flow rates <br /> anticipated for the site. <br /> Table 3. <br /> Typical Quantity of Effluent <br /> Average <br /> Quantity Days of <br /> Category Total per Use per Average Daily Flow <br /> Bedrooms Bedroom Year Per Facility <br /> per Day <br /> al <br /> (100 gallons per 1St bedroom per <br /> 1 100 365 day x 1 bedroom x 365 days) / <br /> Existing 365 days= 100 gal <br /> Main House-3 <br /> Bedroom (50 gallons per bedroom per day <br /> 2 5o 365 x 2 bedrooms x 365 days)/365 <br /> days= 100 gal <br /> (100 gallons per 1st bedroom per <br /> 1 100 365 day x 1 bedroom x 365 days) / <br /> Proposed 365 days= 100 gal <br /> 2nd Unit Dwelling-3 <br /> Bedroom (50 gallons per bedroom per day <br /> 2 5o 365 x 2 bedrooms x 365 days)/365 <br /> days= 100 gal <br /> *Based on E H D request with previous studies <br /> TOTAL AVERAGE GALLONS PER DAY 400 gallons <br /> Petralogix Engineering,Inc. <br /> 26675 BruelIa Road,Galt,Ca 95632 <br /> (209)-40o-5729 <br /> www.petralogix.com <br />