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Sheet 2 of 2 <br /> <br />SECTION 9: SANITARY SEWER <br /> <br />9.01 <br /> <br />Design criteria source is: On-Site Sewage Disposal Rules, May 29, 1984 <br />published by the State of Oregon. Use current standards if this info <br />is outdated. <br /> <br />9-02 <br /> <br />Sewage Flow for Housing. <br /> 10 apartment units ~ 300 gal. per day per unit = 3000 gpd <br /> <br />9.03 <br /> <br />Sewage Flow for Cooking Facility <br /> 20 seat (restaurant) ~ 40 gal. per day per seat = 800 gpd <br /> <br />Total Flow (Q) .................................... 3800 gpd <br /> <br />Tank Volume: V = 1125 + 0.75 Q = 3975 gallons use 4000 gal. <br /> <br />9,04 <br /> <br />9.05 <br /> <br />9.06 <br /> <br />Length of Disposal Trench Required <br /> <br /> Assume soil Group B, effective soil depth 48 inches. <br /> Depth to temp. groundwater 48 inches. <br /> 75 linear feet per 150 gpd. <br /> <br /> (3800 gpd x 75 L.F.) / 150 gpd = 1900 Lineal Feet <br /> <br />In aceordance with OAR 340-71-520, the disposal field will be divided <br />into equal units such that no unit receives more than 1300 gallons per <br />day. <br /> <br />All land surrounding the site is National Forest. Within 600 ft. there <br />are two potential sites for original construction of drainfields and at <br />least two sites for replacement construction. All potential disposal <br />sites meet setback criteria. <br /> <br /> <br />