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~ugust 31~ 1992 APPLICANT~ HAl%0LD M. sMITH SITE NU~E~R: 92-2999 RE PLaCE~ SYST~ 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 4~0 ~allons Der day. Eased on soil conditions observed on %his site, the disposal field will be sized at 50....lineal ~eet per ~allons of projected daily sewage flow. A minimum of 150 £~et of disposal field will be required for your propose~ develop- men----~. The disposal trenches are constructed two (2) fe~t wide and on minimum ten (10) foot cente=s and with nO line exceeding 125 feet in length. Thc trenches and perforated pipe are installed l~vel (zl") and contoured to follow the natural greund surface, 3. The disposal field shall be constructed with seridistribution with a minimum trench depth of 2~ ~nches and a maximum trench depth of 24 in~, There must be at least 12 inche~ ef backfill over the top of the gravel, measured from the natural ground surface. 4. The sand filter system ~hall be designed and operated as per OAR 340-71-~90 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 concrete box is used as the sand filter container. A pamphlet is available in OU~ office which details the requirements for a sand filter system. A groundwater interceptor is required es part of this system. This interceptor trench must be constructed a minimum twelve (12) inches wide by 36 inches deep with 30 inches of clean gravel placed eve= a four (4) inch smooth wall perforated pipe. The interceptor must be located a~ least ten (10) feet upslope from the disposal field and must discharge through a watertight, non- perforated pip~ beside or below th~ disposal field, A separation of 2~ feet is r~quired from the septic tank if the tank is le=ated upslope of the groundwa- ter interceptor. This approval is site specific to the area tested and the septic system must be located in the i~ediete area of the test pits unless otherwise autho- rized by this office. A new site evaluation may be required if the system proposed for a different area On the p~operty. SPeCIaL CONDITIONS= This drainfield should be constructed as far up SlOpe as possible within the area of the soil test pits. There is a moderate rock hazard associ- ated with dralnfield censtruction, Rock larger than six inches must be removed from backfill material. Refer to the enclosed setback list which outlines minimum separation distances between cemponents of septic systems and other features. Soil uonditions are marginal for drainfield THIS IS NO~ A p~RMI~, ~.,,,,.,~a?~- ~E ~E~TIC,SYSTEM. DO NO~ INSTALL THE SYST~ UNTIL A IrALID PERMIT ~A$ BEEN ISSUED BY ~,X,~ OFF/CE.