Laserfiche WebLink
Nitrate Loading Study Irerracon <br /> Arellano Property _ Stockton, California <br /> April 26, 2019 w Terracon Project No. NA187058 <br /> design purposes. Typically, use estimates for the sizing of septic systems include a peak use <br /> factor, whereas the numbers discussed here are based on long-term averages. <br /> The estimated sewage flow rates for use categories are available from a number of references. <br /> The uses presented below were guided by the San Joaquin County On-Site Wastewater Disposal <br /> Standards (2003), Crites and Tchobanoglous (1998), and EPA (1980). Table 4-2 of the text from <br /> Crites and Tchobanoglous indicates that the typical residential use rate is 70-gallons per day per <br /> bedroom. The EPA Design Manual (Table 4-6) indicates the typical use rate is 45-gallons per <br /> day per resident. Based on a review of the United States Geological Survey (USGS) California <br /> Water Science Center California Water Use 2010 Data, average daily domestic use per capita <br /> was estimated at 69-gallons per day. The EHD recommends a residential use rate of 70-gallons <br /> per person/day times two persons per bedroom. <br /> The rates presented from the references provide general guidance but do not always reflect a <br /> match in usage. Should any of the above information provided to our office change or is inconsistent <br /> with what is stated, our office shall be contacted to make any necessary modifications to our <br /> calculations. Examination and professional judgement,and experience shall be used when selecting <br /> a reasonable flowrate. The below table presents the proposed potential septic wastewater use for <br /> the site. The flow rates selected for the uses associated with this project are based on EHD <br /> recommendations and estimated double occupancy per bedroom. <br /> Table 3. <br /> Potential Quantity of Effluent. <br /> Potential Average <br /> Number Number Effluent Average Potential Average Daily <br /> Category of of People Quantity per days of Flow <br /> Bedrooms per Person use per (gpd*) <br /> Bedroom (gpd*) year <br /> (3 bedrooms x 2 people per <br /> Existing bedroom x 70 gal. per day x <br /> Residence 3 2 70 365 365 days per year)/365 <br /> days per year= 420 gpd <br /> (3 bedrooms x 2 people per <br /> Proposed bedroom x 70 gal. per day x <br /> Residence 3 2 70 365 365 days per year)/ 365 <br /> days per year= 420 gpd <br /> Potential Average Daily Flow Total F840gallons per day <br /> *gpd -gallons per day <br /> Based on a review of Table 3, the estimated potential average daily flow for the existing and <br /> proposed residence is 840-gallons of effluent per day. <br /> Responsive s Resourceful a Reliable 7 <br />