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.4 ...,. Marion County <br /> OREGON SEPTIC SYSTEM REQUIREMENTS AND FIELD NOTES <br /> PUBLIC WORKS <br /> Design Flow 450 GPD <br /> Initial System Repair System <br /> System Type:ATT TS1 w/ Gravelless Abs. System Type: ATT TS1 w/ Gravelless Abs. <br /> Field Size: 150 LF Field Size: 150 LF <br /> Size Factor: 50 LF / 150 gal. Size Factor: 50 LF / 150 gal. <br /> Install Depth (inches) Install Depth (inches) <br /> Min 10 Max 10 Min 10 Max 10 <br /> Special Requirements <br /> Must meet a 50 foot setback to Fruitland Creek OAR 340-071-0290(2)(g) <br /> Notes & Landscape Features <br /> Backfill requirements differ depending on product used for gravelless abs, check product approval <br />