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r <br /> GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> A N D A S 5 O C I A T E S INSPECTIONS s TESTING <br /> LABO <br /> ATORY <br /> 0?:�a <br /> MWED POOLRENGINEERINGCES <br /> MAY 1 0 2006 POST TENSION DESIGN <br /> May 9, 2006 <br /> NOA Project Number:E05144B ENVIRONMENT HEALTH <br /> PERMITISERVICES <br /> Ted Tasiopoulos <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Avenue <br /> Stockton, CA 95212 <br /> Re: Aziz Property <br /> 21301 South Reeve Road <br /> Tracy, California <br /> Dear Ted, <br /> The following is the calculation for the weighted average result for the total concentration of <br /> nitrogen in Mg/L-N. Per the request of Rodney Estrada, the total nitrogen concentration for the <br /> commercial septic system has been changed from 60 mg/L-N to 85 mg/L-N. <br /> Table 1. <br /> Typical 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 <br /> Total 58 -- 548 <br /> Note —gpd is gallons per day. <br /> For the subject property,the total daily waste water quantity was estimated to be 548 gallons per <br /> day.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. <br /> Based on a weighted average of total nitrogen concentration in a commercial (85 mg/L-N) and <br /> residential (45 mg/L-N) mix, the result for the estimated concentration for total nitrogen in waste <br /> water for the project is approximately 56.4 mg/L-N over the long term. <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,California 95240 0 209.367.3701 0 209.369.4228 fax ■www.noanderson.com <br />