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Bird Road Facility Page 10 of 13 Project Number: E07183A November 30, 2007 parked for occasional employee overnight stay. The Site will also have a three-bedroom residence on site. The estimated sewage flow rates for use categories are available from a number of references. The uses presented below were guided by the San Joaquin County On-Site Wastewater Disposal Standards (2003), Crites and Tchobanoglous (1998), and EPA (1980). The references indicate that 13 gallons for each employee is typical for a machine shop mechanic, 100 gallons for each trailer, and 70 gallons for each resident (four (4) residents assumed to occupy a three-bedroom residence) (Crites and Tchobanoglous, 1998). The following table presents the septic waste water uses associated with the Site. The rates presented from the references provide general guidance but do not always reflect a match in usage. Careful examination, professional judgment, and experience are necessary to select a reasonable flow rate estimate. The flow rates selected for the uses associated with this project are presented next. Table 4. Typical Quantity of Effluent. Category Total per Average Quantity per Average Daily Flow per Parcel Day Person " Trailer 4 100 gal/day/trailer (4 trailers * 100 gpd) = 400 gpd * 5/7 = 286 gpd Residence 4 70 gal/day/resident (4 residents * 70 gpd) = 280 gpd Employees 12 13 gal/day/employee (12 employees * 13 gpd) = 156 gpd * 5/7 = 112 gpd TOTAL 678 gpd Note: gpd is gallons per day.5/7 conversion is used to account for a fve-day business week. For the subject property, the total daily waste water quantity is 678 gallons per day. A five- sevenths conversion was used to account for a five day work week. The average total nitrogen concentration of domestic waste water is normally considered to be 20-85 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. 85 mg/L-N will represent influent from commercial use. It is estimated that the average concentration for total nitrogen in waste water for the project is approximately 51.60 mg/L-N over the long term. Shown below is a weighted average was used to average the commercial and residential/trailer nitrogen concentrations. .. Weighted Average Calculation 566 gpd x 45 mg/L-N = 25,470 gpd•mg/L-N 112 gpd x 85 mg/L-N = 9,520 gpd•mg/L-N 566 gpd +112 gpd = 678 gpd 25,470 gpd•mg/L-N + 9,520 gpd•mg/L-N = 34,990 gpd•mg/L-N 34,990 gpd•mg/L-N / 678 gpd = 51.60 mg/L-N r.. 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02007 Neil O.Anderson&Associa(es,Inc