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Nitrate Loading Study lrarracon Rowe Property w Lodi, CA November 6, 2017 ■ Terracon Project No. NA177059 Based on a review of Table 2, the estimated sewage flow rate for two people is 140-gallons per day. The estimated sewage flow rate for the proposed future site use for one person is estimated at 140-gallons per day. The combined estimated sewage flow rate is 280-gallons per day for both the existing and proposed future site use. According to Mr. Estrada, the EHD recommends calculating the estimated sewage flow based on the number of bedrooms per residence with an average potential occupancy of two persons per bedroom. The following table presents the proposed potential septic wastewater use for the site. The flow rates selected for the uses associated with this project presented below are based on EHD recommendations and estimated potential occupancy of 2 persons per bedroom per day. Table 3. Potential Quantity of Effluent. Potential Average Number Number Effluent Average Potential Average Daily Category of of People Quantity per days of Flow use per Bedrooms per Person (gpd*) Bedroom (gpd*) Year (3 bedrooms x 2 people per Existing bedroom x 70 gal. per day x Residence 3 2 70 365 365 days per year)/365 days per year=420 gpd (2 bedrooms x 2 people per Proposed 2 2 70 365 bedroom x 70 gal. per day x Residence 365 days per year)/365 days per year=280.0 gpd Potential Average Daily Flow 700.0 gallons per day *gpd-gallons per day Based on a review of Table 3, the estimated potential sewage flow rate for the existing three bedroom residence is 420-gallons per day. The estimated potential sewage flow rate for the proposed future site two bedroom residence is 280-gallons per day. The combined estimated potential sewage flow rate for both the existing and proposed future site use is 700-gallons per day. The average total nitrogen concentration of domestic wastewater is normally considered to be 20 to 85 mg/L-N with 35 to 45 mg/L-N being typical (Crites and Tchobanoglous, 1998). It is estimated that commercial use will have higher concentrations of total nitrogen when compared to residential use. For the purposes of the nitrate loading estimate, it is estimated that the average concentration for total nitrogen in wastewater for the project is approximately 35 mg/L-N over the long term. Responsive ■ Resourceful n Reliable 7