Bonita Peak CAG 2/28/2019 Peter Butler, Ph.D. Draft IRAP Summary - - PowerPoint PPT Presentation
Bonita Peak CAG 2/28/2019 Peter Butler, Ph.D. Draft IRAP Summary Addresses 26 Sites Out of 46 Sites and Two Study Areas. Actions Are Interim; More May Be Done at these Sites. Adaptive Management Approach. Enables Early
Bonita Peak CAG 2/28/2019 Peter Butler, Ph.D.
Addresses 26 Sites Out of 46 Sites and Two Study Areas. Actions Are Interim; More May Be Done at these Sites. Adaptive Management Approach. Enables Early Actions at Multiple Sites to Speed Up Process. Smaller Sites, Generally Privately Owned. No BLM Owned Sites; One at least Partly Owned by Forest Service.
A. Move Mine Drainage Away from Mine Waste – 20 sites. B. Divert Upland Flow around Mine Waste. – 11 sites. C. Remove Sediment from Ponds Treating Drainage – 8 sites. D. Remove In-Stream Mine Waste – 2 sites. E. Cover Recreation Sites with Human Health Risk – 5 sites.
Alternative A – Diversion/Isolation Total Capital Cost: $1,082,000 Total Annual O&M Cost (15 years): $1,890,000 Total Periodic O&M Cost (15 years): $301,000 Total Alternative Cost (PV): $2,411,000 --------------------------------------------------------- Total Capital Cost A+B+C+D= $3.8 million. Total Present Value Cost A+B+C+D= $8.3 million.
High Costs – Possible Double Counting. A. Divert Drainage – Capital Cost: $55,000/site; Total PV: $120,000/site. B. Divert Stormwater - Capital Cost: $91,000/site; Total PV: $173,000/site. C. Excavate Sediment - Capital Cost: $175,000/site; Total PV: $425,000/site. D. In-Stream Waste - Capital Cost: $170,000/site; Total PV: $312,000/site.
Lots of Water Quality Data Showing Toxic Metal Concentrations. No Estimates of Possible Metal Reductions at Sites. No Estimates of How Sites Are Affecting Water Quality in Nearby Streams. No Estimates of How Alternatives Will Improve Aquatic Life.
No Prioritization between Sites in IRAP. Costs Should Be Allocated by Site Not Alternative. Estimate Metal Reductions per Unit Cost (Biggest Bang for the Buck). No Prioritization with Other Possible Projects. Compare Cost/Benefit to Doing Additional Work at Some Sites vs. BMP’s at All Sites. Compare Cost/Benefit to More Fully Using Treatment at Gladstone.
Theoretically, Could be Quite Useful. Need to Estimate Costs and Benefits of Action, Implement Action, Compare Actual Costs and Benefits to Estimated. So Far, No Estimates of Benefits and No Plan or Dollars Allocated for Analysis after Interim Action Implementation. Potentially Responsible Parties (PRP’s) Don’t Like Uncertainty of Adaptive Management.