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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 (three-bedroom residence on site. ri r The estimated sewage flow rates for use categories are available from a number of references. The use nted below were guided by the San Joaquin County On-Site Was ter Disposal Sti rds (200 'tes and Tchobanoglous (1998), and EPA (1980). b eferenc indicate tha _13 ga for eac employee is typical for a machine shop mechani 100 gallon for each f trail an gallons r each resident (four (4) residents assumed to occu a t e-bedroom residence) Crites and chobanoglous, 1998). The following table presents the septic waste water uses associated with the Site. The rates FAI 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 9 p ] 9 P reasonable flow rate estimate. The flow rates selected for the uses associated with this project L are presented next. Table 4. ri lypical 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 517 286 g Residence 4 70 gal/day/resident (4 residents* 70 gpd) 280 g Employees 12 T13 gal/day/employee em ioyees* 13 gpd) = 156 gp /7 IL gp TOTAL 678 gp Note: gpd is gallons per day.5/7 conversion is used to account f6ra -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. r 4esiden/til aver e total Ogen entration of domestic waste water is normally considered to be 5 m -Nm L-N being typical�ites and Tchobanoglous, 1998). It is E . ed that cV' ,\rcl ill have higher concentrations of totaLa tr_og_en when compared al 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`713 Shown below is a weighted average was used to average the ammercial-and-residentialltraller nitrogen concentrations. Weighted Average Calculation 566 gpd x 45 mg/L-N = 25,470 gpd•mg/L-N F1 112 gpd x 85 mg/L-N = 9,520 g -N ! { 566 gpd +112 gpd = Tgpd 25,470 gpd•mg/L-N + 9,520 gpd-mg/-=N�= 34,990 gpd• /L-N F', 34,990 gpd mg/L-N / 678 g = 51.60 mg/L-N I '0040i 902 Industrial Way•Lodi,CA 95240-209.367.3701 •Fax 209.369.4228 ©2007 Neil 0.Anderson&Associates,Inc