NC0005088_CSS_Appendix K_20191231

Corrective Action Plan Update December 2019
Cliffside Steam Station
SynTerra
APPENDIX K
REMEDIAL ALTERNATIVE COST ESTIMATE
DETAILS

Table 1: Summary of Capital and Annual Costs
Groundwater Extraction Combined with Clean Water Infiltration and Treatment
Active Ash Basin
Cliffside Steam Station
Capital Costs
TASK #
TASK
UNITS
QUANTITY RATE
COST
1.0
Design/Engineering/Site Preparation
Pre -Design Field Planning
LUMP SUM
1
$136,000
$136,000
Design Document/Work Plan
LUMP SUM
1
$417,000
$417,000
Permitting
LUMP SUM
1
$33,000
$33,000
$586,000
2.0
Monitoring Well Installation
Monitoring Well Installation
EACH
3
$22,667
$68,000
Monitoring Well Development
EACH
3
$1,667
$5,000
Installation of Dedicated Sampling Equipment
EACH
3
$2,333
$7,000
$80,000
3.0
Remediation Wells Installation
Extraction Well Installation
EACH
23
$38,957
$896,000
Clean Water Infiltration Well Installation
EACH
46
$24,804
$1,141,000
Well Development
EACH
69
$1,319
$91,000
Horizontal Well Installation
EACH
1
$95,000
$95,000
Conveyance Piping and Electrical
LUMP SUM
1
$1,229,000
$1,229,000
$3,452,000
4.0
Clean Water Infiltration Treatment System Installation
Clean Water Infiltration Treatment System Installation
LUMP SUM
1
$776,000
$776,000
$776,000
5.0
Project Management
Project Management 10% Capital Cost
LUMP SUM
1
$490,000
$490,000
$490,000
Total Capital Cost
$5,384,000
Operations, Maintenance & Monitoring Costs
TASK #
TASK
UNITS
QUANTITY
RATE
COST
1.0
Operations and Maintenance
Remediation Wells Annual Operations and Maintenance
LUMP SUM
1
$312,000
$312,000
$312,000
2.0
IGroundwater Sampling
Groundwater Sampling Event
EACH
2
$4,000
$8,000
$8,000
3.0
lWell Maintenance
Annual Well Replacement
EACH
1
$173,000
$173,000
$173,000
4.0
Reporting
Annual Reporting
EACH
1
$90,000
$90,000
Five -Year Review Report
EACH
0.2
$88,000
$18,000
$108,000
5.0
Project Management
Project Management 10%Annual Cost
LUMP SUM
1
$60,000
$60,000
$60,000
Total Annual Cost
$6611,000
Present Worth Analvsis
Year(s)
Cost Type
Total Cost
Discount
Factor
Present
Value
0
Capital Costs
$5,384,000
1.000
$5,384,000
1-6
Annual Costs
$661,000
4.076
$2,694,000
7-9
Post -Remedy Monitoring
$290,000
2.032
$589,000
10
Well Abandonment
$48,000
0.614
$29,000
Total Life Cycle Cost $8,696,000
Notes:
1. A - Groundwater sampling event includes 3 newly -installed monitoring wells. Additional monitoring costs are covered under existing programs.
2. Life cycle represents net present value of expenditures with capital costs incurred in Year 0, annual costs incurred thereafter, post -remedy monitoring for 3 years, and well
abandonment in the last year. Discount Rate of 5% assumed.
3. Costs presented herein represent a best estimate at this time. Actual costs may change based on a variety of factors during implementation.
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Table 2: Summary of Capital and Annual Costs
Tree Wells
Units 1-4 Ash Basin
Cliffside Steam Station
Capital Costs
TASK #
TASK
UNITS
QUANTITY RATE
COST
1.0
Design/Engineering/Site Preparation
Pre -Design Field Planning
LUMP SUM
1
$95,000
$95,000
Design Document/Work Plan
LUMP SUM
1
$237,000
$237,000
$332,000
2.0
Monitoring Well Installation
Monitoring Well Installation
EACH
8
$25,250
$202,000
Monitoring Well Development
EACH
8
$1,250
$10,000
Installation of Dedicated Sampling Equipment
EACH
8
$1,500
$12,000
$224,000
3.0
ITree Wells Installation
Tree Wells Installation
ACRE
2.54
$426,770
$1,084,000
$1,084,000
4.0
Project Management
Project Management 10% Capital Cost
LUMP SUM
1
$164,000
$164,000
$164,000
Total Capital Cost
$1,804,000
Operations, Maintenance & Monitoring Costs
TASK #
TASK
UNITS
QUANTITY
RATE
COST
1.0
Groundwater Sampling
Groundwater Sampling Event
EACH
2
$7,000
$14,000
$14,000
2.0
lWell Maintenance
Annual Well Replacement
EACH
1
$37,000
$37,000
$37,000
3.0
Tree Wells Maintenance
Annual Maintenance and Tree Replacement
EACH
1
$64,000
$64,000
$64,000
4.0
Reporting
Annual Reporting
EACH
0
$0
$0
Five -Year Review Report
EACH
0
$0
$0
$0
5.0
Project Management
Project Management (10% Annual Cost)
LUMP SUM
1
$12,000
$12,000
$12,000
Total Annual Cost
$127,000
Present Worth Ana/vsis
Year(s)
Cost Type
Total Cost
Discount
Factor
Present
Value
0
1 Capital Costs
$1,804,000
1.000
$1,804,000
1-6
lAnnual Costs
$127,000
4.076
$518,000
7-9
Post -Remedy Monitoring
$53,000
2.032
$108,000
10
Well Abandonment
$8,000
0.614
$5,000
Total Life Cycle Cost $2,435,000
Notes:
1. "- Groundwater sampling event includes 8 newly -installed monitoring wells. Additional monitoring costs are covered under existing programs.
2. Life cycle represents net present value of expenditures with capital costs incurred in Year 0, annual costs incurred thereafter, post -remedy monitoring for 3 years, and well
abandonment in the last year. Discount Rate of 5% assumed.
3. Costs presented herein represent a best estimate at this time. Actual costs may change based on a variety of factors during implementation.
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Table 3: Summary of Capital and Annual Costs
Groundwater Extraction Combined and Source Control Trench
Unit 5 Inactive Ash Basin
Cliffside Steam Station
Capital Costs
TASK #
TASK
UNITS
QUANTITY RATE
COST
1.0
Design/Engineering/Site Preparation
Pre -Design Field Planning
LUMP SUM
1
$95,000
$95,000
Design Document/Work Plan
LUMP SUM
1
$192,000
$192,000
Permitting
LUMP SUM
1
$11,000
$11,000
$298,000
2.0
Monitoring Well Installation
Monitoring Well Installation
EACH
8
$25,250
$202,000
Monitoring Well Development
EACH
8
$1,250
$10,000
Installation of Dedicated Sampling Equipment
EACH
8
$1,500
$12,000
$224,000
3.0
Remediation Wells Installation
Extraction Well Installation
EACH
12
$35,170
$422,000
Extraction Well Development
EACH
12
$1,330
$16,000
Horizontal Well Installation
EACH
1
$145,000
$145,000
Conveyance Piping and Electrical
LUMP SUM
1
$451,000
$451,000
$1,034,000
4.0
Project Management
Project Management 10% Capital Cost)
LUMP SUM
1
$156,000
$156,000
$156,000
Total Capital Cost
$1,712,000
Operations, Maintenance & Monitoring Costs
TASK #
TASK
UNITS
QUANTITY
RATE
COST
1.0
Operations and Maintenance
Remediation Wells Annual Operations and Maintenance
LUMP SUM
1
$155,000
$155,000
$155,000
2.0
IGroundwater Sampling
Groundwater Sampling Event
EACH
2
$7,000
$14,000
$14,000
3.0
lWell Maintenance
Annual Well Replacement
EACH
1
$52,000
$52,000
$52,000
4.0
Reporting
Annual Reporting
EACH
0
$0
$0
Five -Year Review Report
EACH
0
$0
$0
$0
5.0
1 Project Management
Project Management 10%Annual Cost
LUMP SUM
1
$22,000
$22,000
$22,000
Total Annual Cost
$243,000
Present Worth Analvsis
Year(s)
Cost Type
Total Cost
Discount
Factor
Present
Value
0
Capital Costs
$1,712,000
1.000
$1,712,000
1-6
Annual Costs
$243,000
4.076
$990,000
7-9
Post -Remedy Monitoring
$68,000
2.032
$138,000
10
Well Abandonment
$39,000
0.614
$24,000
Total Life Cycle Cost $2,864,000
Notes:
1. "- Groundwater sampling event includes 8 newly -installed monitoring wells. Additional monitoring costs are covered under existing programs.
2. Life cycle represents net present value of expenditures with capital costs incurred in Year 0, annual costs incurred thereafter, post -remedy monitoring for 3 years, and well
abandonment in the last year. Discount Rate of 5% assumed.
3. Costs presented herein represent a best estimate at this time. Actual costs may change based on a variety of factors during implementation.
Page 1 of 1
Arcadis