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...041k,..„,t. Marion County OREGON SEPTIC SYSTEM REQUIREMENTS AND FIELD NOTES <br /> PUBLIC WORKS <br /> Design Flow 500 GPD <br /> Initial System Repair System <br /> System Type:ATT Treatment STD 2 w/ System Type: ATT Treatment STD 2 w/ <br /> Gravelless Absorption p Gravelless Absorption <br /> Field Size: 150 LF Field Size: 150 LF <br /> Size Factor: 45 LF / 150 gal. Size Factor: 45 LF / 150 gal. <br /> Install Depth (inches) Install Depth (inches) <br /> Min 12 Max 14 Min 12 Max 14 <br /> Special Requirements <br /> Operation and Maintenance Contract Required <br /> May require capping fill depending on drainfield materials; Electrical permit will be required <br /> Notes & Landscape Features <br />