SR0083976_SSNL - Laserfiche WebLink

Home Browse Search

12172 N Hibbard Road Project No. 2021-00063 P a g e | 6 5.4 Future On-Site Sources of Nitrate 5.4.1 Quantity and Quality of Domestic Wastewater from Proposed Project The following discussion is for determining the long-term wastewater flow anticipated from the planned residential house for the site, to be incorporated into the nitrate loading analysis. The anticipated wastewater flow determined is not intended to be used for septic system design, because septic system sizing includes a peak use factor, whereas the numbers discussed herein are based on a long-term conservative measure of estimated effluent volume. There is currently a 3-bedroom residence with associated septic system onsite. In addition, a proposed 3-bedroom, 2-bath secondary dwelling unit with a separate septic system is planned for the site. Per San Joaquin County Environmental Health requested guidelines based on previous nitrate loading studies, an average daily flow of 100 gallons for the first bedroom and 50 gallons for each additional bedroom per residence per day is estimated for the site. The following table presents the nitrate contributing septic wastewater flow rates anticipated for the site. Table 3. Typical Quantity of Effluent Category Total Bedrooms Average Quantity per Bedroom per Day (gal) Days of Use per Year Average Daily Flow Per Facility Existing Main House – 3 Bedroom 1 100 365 (100 gallons per 1st bedroom per day x 1 bedroom x 365 days) / 365 days = 100 gal 2 50 365 (50 gallons per bedroom per day x 2 bedrooms x 365 days) / 365 days = 100 gal Proposed 2nd Unit Dwelling – 3 Bedroom 1 100 365 (100 gallons per 1st bedroom per day x 1 bedroom x 365 days) / 365 days = 100 gal 2 50 365 (50 gallons per bedroom per day x 2 bedrooms x 365 days) / 365 days = 100 gal * Based on EHD request with previous studies TOTAL AVERAGE GALLONS PER DAY 400 gallons