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November 27, APPLICANT: SITE NUMBER: SAND FILTER SYSTEM CONSTRUCTION DETAIL SHEET 1992 HARRY THERRIEN 92-3624 Your site has been found suitable for a SAND FILTER ALTERNATIVE S~WAGE DISPOSAL SYSTEM. The following construction specifications shall apply to the installation of your septic system. 1. The septic tank shall have a minimum liquid capacity of lO00 gallons. The projected daily sewage flow for this project is calculated at 450 qallo~, per day. Based on soil conditions observed on this site, the disposal field will be sised 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 (fl") and contoured to follow the natural ground surface. The disposal field shall be constructed with equa~.......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 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. A capping fill is required with this system. The system shall be constructed as indicated on the attached Capping Fill construction detail sheet. An effluent lift pump may be necessaz'y 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: The drainfields must be constructed within the i~ediate area of the westerly test pit. The sand filter may need to be elevated to achieve gravity flow to the shallow drainfield lines. Observe all normal set- back/separation distances. Refer to the setback list which outlines minimum separation distances between septic systems and other features. Note: Construction is limited to the dry ~oil su~er season. This period is normally between June 1 and October ]. THIS ,.IS NOT A PERMIT TO INSTALL THE SEPTIC SYSTEM. DO NOT INSTALL THE SYST~ UNTIL A VALID PERMIT HAS BEEN ISSUED BY THIS OFFICE.