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SAND FILTER SYSTEM CONSTRUCTION DETAIL SHEET March 16, 1993 APPLICANT: KEN ALLEN SITE NUMHER: 93-197 FIVE ACRES, PARTITION Your site has been found suitable for a SD=ND FILTER ALTERNATIVE $EWAGB DISPOSAL SYETEM. The following construction specifications shall apply to the installation of your septic system. 1. The septic tank shall have a minimum liquid capacity of 1000 gallons. The projected daily sewage flow for this project is calculated at 450 qallons per ..~. Based on soil conditions observed on this site, the disDosal field will be sized at 45 lineal feet per 150 qallons of projected daily sewage flow. A minimum of 135 lineal feet of disposal field will be required for your proposed develop- ment. The disposal trenches are constructed two (2) feet wide and On minimum ten (10) foot centers and with no line exceeding 125 feet in length. The trenches and perforated pipe are installed level (±1") and contoured to follow the natural ground surface. The disposal field shall be constructed with equal distribution with a minimum trench depth of 18 inches and a maximum trench depth of 18 inches. There must be at least 6 inches of backfill over the top of the gravel, measured from the natural ground surface. The sand filter system shall be designed and operated as per OAR 340-71-~90 through 340-71-30S. Detailed plans for the system must be submitted prior to permit issuance. A building permit is required if a site built concrete box is used as the sand filter container. A pamphlet is available in our office which details the requirements for a sand filter system. An effluent lift pump may be necessary to construct the disposal field in the approved area and at the correct depth. This approval is site specific to the area tested and the septic system must be located in the immediate area of the test pits unless otherwise autho- rized by this office. A new site evaluation may be required if the system is proposed for a different area on the property. SPECIAL CONDITIONS= Construct the drainfields on the highest part of the property within the immediate area of the northwesterly test pit. The easterly pit is slightly lower which will require a capping fill in conjunction with the sand filter drainfield. Use care not to disturb the natural soil conditions (topsoil) within the area of the drainfield sites. Filter fabric is required to cover the drainfield drainrock prior to backfill- ing. Observe all normal setback/separation distances. Refer to the enclosed setback list which outlines minimum separations between septic systems and other features. THIS IS NOT A PEI~MIT TO INSTALL THE SEPTIC SYSTEM. DO NOT INSTALL THE SYSTEM UNTIL A VALID PERMIT HAS BEEN ISSUED BY THIS OFFICE.