SU0008326_SSNL - Laserfiche WebLink

Home Browse Search

I The maximum average e age dally flow over an a year for the Site was estimated to be 242 gallons per day (gpd). Please see the following table that presents the information in a tabular form. Table 5, Average Daily Flaw Calculation Use Units Rate Subtotal Reductions* Average Daily Flow Office Staff 5 staff 13 gal/staff 65 gpd 5R 46 gallons per day Shop Staff 3 staff 15 gal/staff 45 gpd 5/7 32 gallons per stay Truck Drivers 10.15 128 gallons per (Sunday — trucks 10 gal/truck 150 gpd 6/7 day Friday) Truck Drivers 25 10 gal/truck 250 gpd 117 36 gallons per (Saturday) trucks day Total 242 gallons per day *Reduction factors convert calculated flow into average daily flow over a year.The 517,617, or 117 converts into days of an average week. Reduction factors need to be taken into account since staff are not present every day, and the number of trucks varies depending on the day. J Denitrification Reductions Denitrification is a process that occurs in the septic system drain field whereby certain bacteria oxidize the nitrate (NO3) in the waste water and release nitrogen gas (N2) to the atmosphere. Due to the biologic processes in the shallow soils, nitrogen in the drain :field will may undergo a reduction between 10 percent to 35 percent. Soils with higher clay content, moist soil conditions, high pH, and organic material denitrify by about 35 percent, and soils with high sand content and fast percolation rates tend to denitrify at a lower rate of about 10 percent. A denitrification factor of 25 pe ent was selected for the Site because of the fine- grained nature of the oils. Nitrate Loading Estimate A nitrate loading scenario was employed to determine the impact from the proposed project to ground water. The scenario utilizes the variables discussed previously, which represent the estimated conditions and uses associated with this project. The following LOGE1025 Page 10