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16475 TIDE ROAD Project No.2019-00072 Page 16 <br /> Table 2. <br /> Typical Quantity of Effluent <br /> Average <br /> Quantity Days of <br /> Category Total per Use per Average Daily Flow <br /> Bedrooms Bedroom Year Per Facility <br /> per Day <br /> al <br /> Proposed (140 gallons per bedroom per day <br /> Main House-4 4 140 365 x 4 bedrooms x 365 days)/365 <br /> Bedroom days=560 gal <br /> *Based on EHD request with previous studies <br /> TOTAL AVERAGE GALLONS PER DAY 560 gallons <br /> For the site,the total daily toilet use contributing wastewater quantity is 560 gallons per day. <br /> The average total nitrogen concentration of domestic wastewater is normally considered to <br /> be 20-85 mg/L-N with 35 to 45 mg/L-N being typical (Crites and Tchobanoglous, 1998). <br /> Based on EHD request with previous studies, it is estimated that residential domestic <br /> wastewater concentration will be approximately 35 mg/L-N. <br /> 4.4.2 Denitrification Estimate <br /> Denitrification is an important process which occurs within the leach field whereby certain <br /> bacteria utilize the oxygen in the nitrate (NO3) and release nitrogen gas (N2) to the <br /> atmosphere. Denitrification is expressed as a percentage, and the normally accepted range <br /> is 10 percent to 35 percent. Soils with higher clay content, moist soil conditions, high pH, <br /> and organic material denitrify by about 35 percent,and soils with high sand content and fast <br /> percolation rates are estimated to denitrify at a lower rate,about 10 percent to 15 percent. <br /> Based on the clay soil type for the subject property, denitrification is estimated to be 25 <br /> percent. <br /> 4.5 Nitrate Loading <br /> A nitrate loading scenario was performed to determine the impact from the proposed <br /> project. The scenario utilizes the variables discussed previously which represent the <br /> estimated conditions and uses associated with this project. The following table presents a <br /> summary of the nitrate loading calculation for the parcel. <br /> Petraloglx Engineering,Inc. <br /> 26675 Bruella Road,Galt,Ca 95632 <br /> (209)-400-5729 <br /> www.petralogix.com <br />