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PRESSURE D ON-SITE SEPTIC SYSTEMS' <br /> DOSED <br /> General <br /> Waste water exiting the residence is directed into the septic tank for <br /> primary treatment and clarification of solids. Effluent leaving the <br /> outlet compartment of the tank enters the pump tank, or dosing <br /> chamber, which contains a screened pump vault and pump. The <br /> effluent is then dosed from the dosing chamber to the disposal field <br /> for final disposal. <br /> Dosing System <br /> To insure uniform distribution of effluent to the disposal field, an <br /> effluent pump is employed to transfer effluent to the disposal field. <br /> The pump is mounted in a screened vault suspended in the pump <br /> tank, and discharge of effluent is carried out via Schedule 40 PVC <br /> pipe to the disposal field. The dosing assembly has been fitted with <br /> an integral non-resettable dose counter, which allows for the <br /> calculation of the volume of effluent pumped to the disposal field. A <br /> high level alarm has been installed into the pump chamber, with the <br /> alarm panel attached to the outside of the house or in the garage. <br /> This alarm will sound if the effluent in the tank reaches elevated <br /> levels and may indicate that the pump is not functioning properly. <br /> The tank's access manholes are fitted with water-tight, gas-tight <br /> risers and lids which extend above finished grade to allow access <br /> for periodic maintenance. <br /> Disposal Trench Configuration <br /> The disposal trenches are constructed on contour, parallel to the <br /> slope, and are set about ten feet apart. The trenches are <br /> constructed by excavation with a backhoe and filling to a pre- <br /> determined depth with clean, washed 3/4-inch crushed rock. Within <br /> the gravel is placed a distribution lateral through which the effluent is <br /> pumped from the pump chamber. Small diameter (about 1/8") holes <br /> are drilled into the distribution laterals to allow for the dispersal of <br /> effluent. At the ends of the laterals and rising through the soil cover <br /> over the trenches, is a cleanout assembly which consists of a short <br /> section of pipe attached by an elbow to the distribution lateral. This <br /> section of pipe terminates with a threaded adapter that may be <br /> unscrewed for periodic cleaning. <br /> A layer of earth backfill has been mounded over the entire disposal <br /> field so that a minimum of earth backfill extends a minimum of 12" <br /> deep over the filter fabric located in the trenches. <br /> Inspection Ports <br /> Adapted from the Calaveras County 0& M guidelines <br />