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Petralogix Engineering, <br />26675 Bruella <br />(209)-400-5729 <br />www.petralogix.com <br />11655 S UNION ROAD Project No. 2020-00095 Page 1 6 <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 />. <br />..-- <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 />3-bedroom, 1-bath residence with associated septic system onsite. In <br />2-bedroom, 1-bath secondary dwelling unit with a separate septic <br />the site. Per San Joaquin County Environmental Health requested <br />nitrate loading studies, an average daily flow of 100 gallons for <br />50 gallons for each additional bedroom per residence per day is <br />site. The following table presents the nitrate contributing septic <br />anticipated for the site. <br />Table 3. <br />Typical Quantity of Effluent <br />There is currently a <br />addition, a proposed <br />system is planned for <br />guidelines based on previous <br />the first bedroom and <br />estimated for the <br />wastewater flowrates <br />Category Total <br />Bedrooms <br />Average <br />Quantity <br />per <br />Bedroom <br />per Day <br />(gal) <br />Days of <br />Use per <br />Year <br />Average Daily Flow <br />Per Facility <br />Existing <br />Main House - 3 <br />Bedroom <br />1 100 365 <br />(100 gallons per 1st bedroom per <br />day x 1 bedroom x 365 days) / <br />365 days = 100 gal <br />2 50 365 <br />(50 gallons per bedroom per day <br />x 2 bedrooms x 365 days) / 365 <br />days = 100 gal <br />Proposed <br />2 nd Unit Dwelling - 2 <br />Bedroom <br />1 100 365 <br />(100 gallons per 1st bedroom per <br />day x 1 bedroom x 365 days) / <br />365 days = 100 gal <br />1 50 365 <br />(50 gallons per bedroom per day <br />x 1 bedroom x 365 days) / 365 <br />days = 50 gal <br />* Based on EHD request with previous studies <br />TOTAL AVERAGE GALLONS PER DAY 350 gallons <br />Inc. <br />Road, Galt Ca 95632 <br />I I