SR0069438 - Laserfiche WebLink

Home Browse Search

Septic System Operational Overview Discussion of the decentralized wastewater management system operation and design will begin with the source of wastewater from the restroom and continue sequentially to the end of the final disposal of effluent, which will be through-a-36-inch diameter seepage pit. Beginning with the proposed toilet and sink: Domestic water for hand washing and toilet flushing will originate from a domestic well located west of the existing milk barn, 175 ft from the s ed new leachline and pit. Blackwater and graywater influent will gravity flow into 200 gallo ,two compartment, monolithic septic tank, to be located directly east of the restroom, ustrated. This short travel distance is beneficial for solids management provided there is a sufficient fallf 2%. The tank will trap paper, solids, etc. and provide preliminary treatment. Treated effluent will then gravity flow from the tank through a five-ft long tightline where perforated piping will begin within th<two ft wide 40 ft long lcachline tren"c . The depth of this trench is currently unknown, but cannot exceed 4�2inchgs—It should be easily achievable to not exceed this maximum depth due to the short distance from the restroom to the septic tank, therefore keeping the tank as high in elevation as possible. A distribution box or"D-box"w'1}1 not be required since there is no need to equally distribute effluent between multiple leachlines. B. Domestic Wastewater Disposal System Design Specifications Wastewater Flow Volumes and Characteristics Since there are no food preparation or kitchen areas within the proposed milk barn facility, organic loading to the soil should be minimal and certainly less than what would be observed in household domestic wastewater(provided food wastes are not flushed down the toilet). Also, it is imperative that no chemicals, solvents or petroleum products, other than low concentrations of household cleaners are introduced into the septic system. Influent/effluent flow volume calculations: Considering that if the toilet (1.5 gallon/flush) were flushed once every hour over a 24-hour work day (milk barn operates 24/7), with a minimal sink water usage of 0.25 gals,we haeme (1.5 gals/flush+0.25 gals for hand washing= 1.75 gals)x 24 hrs' 42 gallons Averagee Daily Flo',. This is an exceedingly reasonable ADF water usage. Septic Tank _ The septic tank will'not ha a to be traffic-rated since no vehicles will be traveling or parking over it. However, thereis-a ssibility of accidental vehicular traffic over the tank and leachline and pit. Consequently, crash posts, bollards or barriers such as railroad ties shall be installed around the footprint of the tank and leachfield. Cut sheet specifications for the septic tank are found in Appendix C. An effluent filter shall be installed in the second compartment of the tank,which is specified ikAppendix D. Peaking factors vary with usage during the hour of the day, and day of the week. Peak hourly rates are associated with normal working hours. The ratio of the peak day to the average day can vary from 1.5 to>5, depending upon the usage. A peaking factor of 2.5 is used in the calculation below: Page-3-