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Marion County OREGON SEPTIC SYSTEM REQUIREMENTS AND FIELD NOTES <br /> PUBLIC WORKS <br /> Design Flow 450 GPD <br /> Initial System Repair System <br /> System Type: System Type: Standard <br /> Field Size: LF Field Size: 300 LF <br /> Size Factor: Size Factor: <br /> LF / 150 gal. 100 LF / 150 gal. <br /> Install Depth (inches) Install Depth (inches) <br /> Min Max Min 24 Max 30 <br /> Special Requirements <br /> dry soil install only (June 1 - Oct 1 unless authorized by this office) <br /> Notes & Landscape Features <br /> backslope <br /> pit 3 similar to pits 1 and 2 except for shallow (10") gravel trench intersecting pit, this trench must <br /> be avoided (8' undisturbed earth required). No pipe or sewage evident in trench <br />