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SAND FILTEH C,A~PING FILL SYSTEM CONSTRUCTION DETAIL SHEET January 25, 1994 APPLICANT= SITE NUMBER= CARLO ELLIS 94-295 SUBSTANDAi~D SAND FILTER-CAPPING FILL P~EPAIR Your site has been found suitable for a SAND FILTER ALTERNATIVE SEWAGE DISPOSAL SYSTEM. The following Construction specifications shall apply to the installation of your septic system. The septic tank shall have a minimum liquid capacity of 1000 gallons. The projected daily sewage flow for this project is calculated at 450 gallq~s per day. Based on soil conditions observed on this site, the disposal field will be sized at 50 ~ineal feet per 150 ~allons of projected daily sewage flow. A minimum of 1S0 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 equ.al distribution with a minimum trench depth of 12 inches and a maximum trench depth of 12 inches. There must be at least 16 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 340-71-290 through 340-71-305. Detailed plans for the system must be submitted prior to permit issuance. A building permit is required if a site built consrete box is used as the sand filter container. A pamphlet is available in our office which details the requirements for a sand filter system. A capping fill is required with this system. The system shall be constructed as indicated on the attached Capping Fill construction detail sheet. Construct%on is limited to the dry soil summer season. 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. SFECIAL CONDITIONS: Construct the shallow capping fill drainfield within the immediate area of the soil test pits. A shallow tile de-watering might benefit the drainfield if an outlet point can be established. The installation is substandard because a high seasonal water table can be expected within the drainfield area at or very near the soil surface. The sand filter base must be elevated to achieve the 12 inches minimum separation difference required between the collector-drain outlet invert and the top of the drainfield drainrock. The existing septic system must be abandoned at the earliest opportunity, we will consider connecting the larger manufactured home into the existing system on an interim basis only with a written commitment from the owner to construct the necessary sand filter-capping fill repair system during the coming summer season. Use filter fabric to cover the drainrock in the drainline trenches. THIS iS NOT A PE~,MIT TO INSTALL THE SEPTIC SYSTEM. DO NOT INSTALL THE SYSTEM UNTIL A VALID PEP, MIT HAS BEEN ISSUED BY THIS OFFICE.