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hm GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> 6. .44 A N D A S S O C I A T E S INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> April 7, 2006 <br /> NOA Project Number: E06020A <br /> calculate the residential septic tank usage for the parcel. <br /> 6. The following tables presents the septic waste water uses associated with the Site. The rates <br /> presented from the references provide generalguidance but do not always reflect a match in usage. <br /> 6. Careful examination,professional judgement, and experience are necessary to select a reasonable <br /> flow rate estimate. The flow rates selected for the uses associated with this project are presented <br /> next. <br /> Table 1. <br /> ` <br /> Tylpical Quantity of Effluent <br /> Category Total People per Average Quantity per Average Daily Flow <br /> ` Day Person Per Parcel <br /> Commercial 52 2.0 gal/day/customer (50 customers*2.0 gpd) + <br /> 14 gal/day/employee (2 employees* 14 gpd) = 128 gpd <br /> Residential 6 70 gal/day/resident 6 residents*70 gpd/resident=420 gpd ,77 <br /> °i� <br /> Total 58 -- 548 <br /> Note —gpd is gallons per day. <br /> For the subject property, the total daily waste water quantity is 548 gallons per day. <br /> V <br /> The average total nitrogen concentration of domestic waste water is normally considered to be <br /> 20-85 mg/L-N with 35 to 45 mg/L-N being typical (Crites and Tchobanoglous, 1998). It is <br /> estimated that commercial use will have higher concentrations of total nitrogen when compared to <br /> residential use. Based on a weighted average of total nitrogen concentration in a commerchl (60 <br /> mg/L-N) and residential (45 mg/L-N) mix, thF result for the estimated concentration fQ�total`___ <br /> ■- nitrogen in waste water for the project is approkimate�y 47.6 mgX--N over the long term <br /> 1 _ <br /> n <br /> i <br /> L <br /> 6 <br /> ` LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 0 209.367.3701 0 209.369.4228 ■www.noar <br />