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SAND F??,~ SYSTEM CONSTRUCTION DETAIL SHEET August 31, 1992 APPLICANT= SITE NUMBER: EAROLD M. SMITH 92-2999 REPLACEMENT SYSTEM 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 qallons pp~ day. Based on soil conditions observed on this site, the disposal field will be sized at 50. lineal feet p~ 150 gallons of projected daily sewage flow. A minimum of 150 l~eal 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 serial distribution with a minimum trench depth of ~4 inches and a maximum trench depth of 24 inches. There must be at least 12 inches of backfill over the top of the gravel, measured from the natural ground 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 groundwater interceptor is required as 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 over a four (4) inch smooth wall perforated pipe. The interceptor must be located at least ten (10) feet upslope from the disposal field and must discharge through a watertight, non- perforated pipe beside or below the disposal field. A separation of 25 feet is required from the septic tank if the tank is located upslope of the groundwa- ter interceptor. 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= 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 drainfield construction. Rock larger than six inches must be removed from backfill material. Refer to the enclosed setback list which outlines minimum separation distances between components of septic systems and other features. Soil conditions are marginal for drainfield construction, so summer season construction is recommended. THIS IS NOT A PERMIT TO INSTALL TEE SEPTIC SYSTEM. DO NOT INSTa?~, THE SYSTEM UNTIL A VALID PERMIT ~A$ BEEN ISSD-ED BY THIS OFFICE.