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., ....„ Marion County <br /> OREGON SEPTIC SYSTEM REQUIREMENTS AND FIELD NOTES <br /> allPUBLIC WORKS <br /> Design Flow 450 GPD <br /> Initial System Repair System <br /> System Type: System Type: ATT TS1 w/ Gravelles Abs. <br /> Field Size: LF Field Size: 150 LF <br /> Size Factor: LF / 150 gal. Size Factor: 50 LF / 150 gal. <br /> Install Depth (inches) Install Depth (inches) <br /> Min Max Min 10 Max 10 <br /> Special Requirements <br /> AU Gravelless on reduced centers for space concerns. <br /> Notes & Landscape Features <br /> Evaluation of soil was done via auger hole <br /> Backfill requirements differ for gravelless products, see product approval for details. <br />