Laserfiche WebLink
November 19, 2004 <br /> NOA Project Number: E040107A <br /> Table 1. <br /> Typical Quantity of Effluent. <br /> Category Total People Average Quantity Average Daily Flow <br /> per Day per Person Per Parcel <br /> Mobile 3 70 gal/day/person 3 residents/day*70 gpd/person <br /> Home =210 gpd <br /> Sign Shop 4 13 gal/day/person 4 residents/day* 13 gpd/person*5/7 <br /> (workers) =38 gpd <br /> Sign Shop 1 5 gal/day/person residents/dap.*5 gpd/person* 5/7 <br /> customers — d <br /> Note —gpd is gallons per day.The 5/7 factor accounts for the 5 day work week. <br /> F! <br /> The daily waste water,quandty is estimated to be 252 gallons for the new parcel. <br /> 1 The average total nitrogen concentration of domestic waste water is normally considered to be <br /> 20-85 mg/L-N (Crites and Tchobanoglous, 1998). For the purposes of the nitrate loading estimate, <br /> the7ong-term average concentration for total nitrogen in waste water is estimated to be 45 mg/L-N. <br /> 3.4.2 Deaiaification Estimate <br /> Denitrification is an important process which occurs within the leach field whereby certain bacteria <br /> utilize the oxygen in the nitrate (NO3) and release nitrogen gas (ND 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. <br /> A denitrification factor of 25erc was for the Site. <br /> 3:5 Nitrate Loading Scenario <br /> A nitrate loading scenario was performed to determine the impact from the proposed pro)ect. The <br /> scenario utilizes the variables discussed previously which represent the estimated conditions and <br /> FI <br /> uses associated with this project. The following table presents a summary of the nitrate loading <br /> calculation. <br /> 0 <br /> - 5 <br />