My guess:
- Tank should be flat bottom, of API650 or AWWA construction
- About 36 ft diameter and 40 foot shell
- For all stainless construction at ~$6.00/lb ---approximately $700K to $850 K
( this does not include the costs of foundation... which can be substantial)
- For mild steel construction, at ~$3.50/lb --- approximately $400K to $550K
( You must add in the foundation costs and costs for interior/exterior painting systems)
This is only a ballpark estimate...