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L <br />110.0 <br />90.0 <br />85.0 <br />80.0 <br />75.0 <br />70.0 <br />65.0 <br />60.0 <br />0.0 <br />- <br />FIGI <br />Unit Weight vs. Overburden Load <br />500 100 0 150 0 200.0 250 0 300.0 <br />Overburden Load, psi <br />Page 1 <br />350.0 400.0 450.0 500.0 <br />—4-2 inch Or <br />