Centered ring 11' R, resting on ground and additions to existing steel supports
E2
Smaller front ring to give access in opening 7-8' R resting on ground and existing wall
E3
Largest front ring buried or broken where it meets the ground. Allows for larger ring using the height of the existing steel supports 11' R. Rests IN ground and on existing supports.
E4
Modified E3 with smaller back ring opening up for view and light
F
Scheme F uses existing steel rings, 9', 7',3' in diameter
9' and 3' rings
F1
3' and 9' in front, sharing 7' ring in back, 9' ring in entrance
F2
3' and 9' in front, sharing 7' ring in back, 9' ring covering opening in wall
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