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FF4. Thcnumber of parking spaces for the Office Building is approximately 66,which gives an or the number of employees,customers,etc. who may be on-site at any given time of the day. renced above will be used to formulate an ADF from the West Lathrop Business ding. Assigning the following averaged parameters to provide the ADF: 1.) 25 gallons per person who may park in any of the total number of parking stalls, 2.) 150 gpd for each toilet, which would also include urinal, shower and dishwasher volumes and 3.) A reasonable number of maximum toilet flushes: OO 66 parking stalls x 25 gals assigned to one person parked in one stall= 1,650 gallons per day(gpd) ® 14 toilets x 150 gallons per toilet per day=2,100 gpd © 6 flushes/hr/toilet x 14 toilets/urinals x 8 hrs/day=672 flushes/day x 1.5 gals/flush= 1,008 gpd Average= 1,650+2,100+ 1,008=4,758-3 = 1,586 gpd ADF for the New Office Building COMMERCIAL WASTEWATER CHARACTERISTICS Primary wastewater constituents-of-concem found in septic tank effluent have influence over two important factors in the operation of an on-site, decentralized wastewater disposal system: Soil effluent acceptance rates and nitrate-nitrogen impact. The Biochemical Oxygen Demand (BOD) test is the most common test used in wastewater analysis, but can be unreliable for determining organic matter in water. BOD is the amount of oxygen, expressed as mg/L or ppm, that bacteria take from water when they oxidize organic matter. To determine BOD, oxygen the bacteria uses is calculated by comparing the amount left at the end of 5 days with the known amount at the beginning. Adsorption and volatilization, followed by microbial degradation are the primary processes for removal of soluble organics. Total Suspended Solids (TSS) is the material retained on a standard glass-fiber filter disk. Suspended solids can be categorized as volatile or fixed suspended solids. TSS can create and enhance biomat formation between the soil and effluent interface, thus restricting infiltration. The biomat, also referred to as a"clogging mat,"is a biological, slimy substance which forms on the soil-effluent interface over time. This mat is composed mostly of aerobic and anaerobic bacteria and bacterial products consisting of polyuronides and polysaccharides. The biomat does have one beneficial property and that is removing approximately 10% of the nitrogen from gravity flow disposal systems. It is unknown how much, if any,biomat material forms under pressurized filter bed systems. Consequently, this 10%nitrogen removal figure will not be used in the nitrate loading calculations on Page 16 to reduce the calculated nitrate loading. Total Nitrogen is the summation of ammonia-nitrogen (NH4) and organic nitrogen (proteins, amino acids, enzymes). Since the septic tank is predominately anaerobic, nitrogen cannot exist in its oxidized state as nitrate for any length of time in the septic tank effluent, and if it does, it is quickly reduced to NO or NOZ. If nitrate existed in septic tank effluent,this would also be added to ammonium and organic nitrogen to arrive at Total Nitrogen. 14 Chesney Consulting