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September 3,2003 <br /> y` Job Number:LG03-226 <br /> Page 8 <br /> acres or more can legally contain a primary residence and a 2 bedroom second dwelling unit <br /> (SDU). For the purposes of the nitrate loading study,the primary residence is considered to be a <br /> 3 bedroom home with 4 persons and the 2 bedroom SDU may be occupied by 3 people. The <br /> highest occupancy of the property is estimated to be 7 people. The average flow rate is estimated <br /> to be an average of 70 gallons per day per person.' The estimated concentration of total nitrogen <br /> of the waste water is estimate to be 45 mg/L-N. The estimated flow generated for each new <br /> parcel is as follows: <br /> Table 4. <br /> Ra <br /> Estimated Quantity of Effluent for Phase I & Phase II. <br /> Category Total Total Quantity per Person Average Daily Flow <br /> Bedrooms Occupants <br /> Parcels 1-3 5 7 persons 70 gal/day/person 7 person x 70 gal/day/person=490 <br /> Primary (3 primary,2 gal/day <br /> Res.and SDU) <br /> SDU <br /> Average Daily Flow: 490 gallons per day per parcel <br /> 7.4 Quantity and Quality of Deep Percolating Rain Water <br /> An estimate of the quantity and quality of rainfall was required for the analysis. The weather <br /> station information for Stockton's potential evapotranspiration was used to estimate the deep <br /> percolation of rain for the site located in Stockton. The deep percolation of rain was estimated to <br /> be 5.01 inches. Please refer to Plate 1 for details regarding the deep percolation of rain. The <br /> nitrate concentration of rain fall was estimated to be 1 mg/L-N.' <br /> 7.5 Denitrification Estimate <br /> INN <br /> Denitrification is an important process which occurs within the leach field whereby certain <br /> bacteria utilize the oxygen in the nitrate(NOO and release nitrogen gas (NO to the atmosphere. <br /> Denitrification is expressed as a percentage, and the normally accepted range is 10 percent to 35 <br /> percent. Soils with higher clay content,moist soil conditions,high pH, and organic material <br /> denitrify by about 35 percent and soils with high sand content and fast percolation rates are <br /> estimated to denitrify at a lower rate, about 10 percent to 15 percent. Due to the percolation rates <br /> 6 Hantzshe N.N.,Finnemore,E.J. 1991,Predicating Ground-Water Nitrate-Nitrogen Impacts. Ground <br /> Water,Vol. 30,No.4. <br /> PERS 1 <br /> IL = r <br /> O � <br /> �ssoc� <br />