2005-P09096 - new septic system - Laserfiche WebLink

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' . ' Two hydraulic conductivity tests were performed at the locations on Figure 1. The depth of the tests were approximately 12 and 24 inches. The results of the tests indicate that at shallower depths the ' conductivity of the soil increases. At 12 inches the saturated hydraulic conductivity is approximately 1.65 gallons per day per square foot while at 24 inches the saturated hydraulic conductivity is approximately 0.7 gallons per day per square foot. The results from the tests are in Appendix A. ' The results of the soil borings and saturated hydraulic conductivity tests indicate that the site can support a standard subsurface drain field at the proposed area depicted on Figure 1. A soil sizing factor of 2.2 ' square feet per gallon per day has been selected. Sizing of Treatment System—The proposed facility will consist of inen's and women's restrooms with a ' total of 3 toilets, a urinal and two showers. Over the course of a year the average daily flow from the facility is estimated at less than 50 gallons per day as use is very little to none during the summer week days and no use in the winter. During the busiest day in the summer it is estimated the facility will have ' a peak flow of 400-450 gallons. Sink and toilet fixtures need to be monitored closely to ensure proper operation. A leaking facet or toilets can more than double the daily flow to the OWS and cause hydraulic failure. A water meter should be added to the water main inlet to the building and monitored ' for water use. The pump system in the OWS can also be equipped to monitor water use. Description of the Treatment Process— ' � Primary Treatment - Sewa e is ravit dischar ed from the house to a se tic tank. N g S Y $ p atural biological activities taking place inside of the septic tank will separate solids and suspended pazticles. ' Solids are reduced to some extent through this process. • Secondary Treatment—Effluent from the cleaz zone of the septic tank flows to a lift chamber and is ' filtered prior to discharge. Suspended particles larger than 1/8" are filtered out by the effluent filter. • Final Treatment— Effluent is pumped to a new 792 square foot drain field. As the effluent trickles ' down into the soil biochemical processes remove harmful viruses and bacteria. ' Description of Treatment Svstem— (See figure, design sheets and data sheets for additional detail.) • Septic Tank — (2) 1,500 gallon two compartment fiberglass septic tanks. Install septic tank per ' manufacturer's recommendations. • Lift Tank—Second compartment of the second septic tank = approximately 500 gallons. ' • Septic/Lift Tank Risers— 24" diameter heavy corrugated PVC pipe. A watertight seal must be created between top of tank and the each riser. ' • Septic/Lift Tank Riser Cover — 24" diameter fiberglass cover with gasket. Tank riser covers should include insulation. Do not bury riser cover. ' • Pump System — Screened vault effluent pump system to deliver a minimum 20 allons er S P minute with a total head of 20 feet. Install a schedule 40 PVC discharge pipe to pump and extend ' 2 �