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July 24,2003 <br /> rrJob Numtier LG03-206 <br /> 4 Page;$ <br /> The.waste water flout generated by the volunteers and visitors is estimated_ on the following table. <br /> Table 5. <br /> Total,estimated average daily flow rate of the septic.system, <br /> User Category Persons Use hate Scale Line Total <br /> . A. ', al/day/personFactor, al/da <br /> 3-bedroom Mobile Home Trailer <br /> 3 <br /> (3 of the'5 total volunteers) �' .70 none. . . 210 <br /> Pc aining 2 Volunteers(Mon-:Sat),, <br /> Industrial building;no food service category 2 15 617 26' <br /> ' <br /> Visitors(Mon-Sat) 10 5 617 43 <br /> —Estimated use by our office— <br /> Grand.T tal: 2791. <br /> *Scale factor to account for different workweeks;617 is a six-day week. <br /> �Ifr fie m bile borne and the warehouse <br /> The waste water generated by the facility msessentiatbathroom. A' otabie water sup l used at the site wed o contain nitrates <br /> concentrations lower than 10'mg/L-N. 'Combined with waste wa r,the concentration of total <br /> nitrogen from this source is estimated to,range between 20-80 mg/L-N with a typical average of ; <br /> 35 mg/L-N(Crites and Tchobanoglous, 1998). For the purposes of this study, we will assume <br /> the average-concentratmon o o 1 nitrogen-will be 35.mg/I-N for-the mobile home and <br /> warehouse facility. The average daily flow is estimated to be 279 gallons er . <br /> 6.A Quantity and Quality of Rain Water <br /> .. An estimate of the quantity and quality of rainfall was-required for the analysis. The estimate of . <br /> deep percolation of rain is based on the average monthly precipitation of rain fall-and <br /> evapotranspiration for Lodi, California. The estimate first determines whether the average <br /> monthlyprecipitation exceeds average monthly potential ET. If so, then the difference is <br /> P P . <br /> potential deep percolation. This method does not consider runoff: See Plate No..8 for the data. <br /> and calculation. <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS)."Lodi is located within evapotranspiration zone number l 2. The <br /> average rain fall for the Lodi area was obtained from the USDA(1992) Soil Survey,for San <br /> Joaquin County. <br />