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Home My WebLink AboutNC0005363_Table 6-1 through 6-5_20160201TABLE 6-1 GROUNDWATER REMEDIATION ALTERNATIVE SCREENING - EFFECTIVENESS W.H. WEATHERSPOON POWER PLANT DUKE ENERGY PROGRESS, LLC, LUMBERTON, NC Prepared By: MT Checked By: KWW P:\Duke Energy Progress. 1026\109. Weatherspoon Ash Basin GW Assessment Plan\20.EG_CAP\CAP Part 2\Tables\Completed Tables 6-1 to 6-5.docx Page 1 of 1 Alternative 1 Alternative 2 Alternative 3 Alternative 4 Effectiveness Monitored Natural phytoremediation Groundwater Groundwater Attenuation (MNA) Interceptor Trench Recovery Wells Will remedial alternative be protective Yes Yes Yes Yes of human health? When will remedial alternative be Current conditions Current conditions Current conditions Current conditions protective of human health? are protective are protective are protective are protective When will remedial alternative be Current conditions Current conditions Current conditions Current conditions protective of the environment? are protective are protective are protective are protective Has the potential remedial alternative been demonstrated effective at any Yes Yes Yes Yes similar sites? Will remedial alternative permanently remove contaminant from site? Yes Yes Yes Yes Will remedial alternative reduce the toxicity of contaminants? No No Yes Yes Yes - source control Yes - source control Yes - source control Yes - source control Will remedial alternative reduce the measures to alter measures to alter measures to alter measures to alter mobility of contaminants? site hydrology will site hydrology will site hydrology will site hydrology and reduce mobility reduce mobility reduce mobility extraction wells will reduce mobility Can the effectiveness of a potential remedial alternative be monitored, Yes Yes Yes Yes measured, and validated? Prepared By: MT Checked By: KWW P:\Duke Energy Progress. 1026\109. Weatherspoon Ash Basin GW Assessment Plan\20.EG_CAP\CAP Part 2\Tables\Completed Tables 6-1 to 6-5.docx Page 1 of 1 TABLE 6-2 GROUNDWATER REMEDIATION ALTERNATIVE SCREENING - IMPLEMENTABILITY W.H. WEATHERSPOON POWER PLANT DUKE ENERGY PROGRESS, LLC, LUMBERTON, NC Prepared by: MT Checked by: KWW P:\Duke Energy Progress. 1026\109. Weatherspoon Ash Basin GW Assessment Plan\20.EG_CAP\CAP Part 2\Tables\Completed Tables 6-1 to 6-5.docx Page 1 of 1 Alternative 1 Alternative 2 Alternative 3 Alternative 4 Feasibility Monitored Natural Phytoremediation Groundwater Groundwater Attenuation (MNA) Interceptor Trench Recovery Wells Are the material resources and manpower readily available to fully implement the remedial alternative in a Yes Yes Yes Yes timely manner? Does the remedial alternative require highly specialized resources and/or No No No No equipment? Is there sufficient onsite and offsite area to fully implement the remedy? Yes Yes Yes Yes Will waste materials be managed Yes Yes Yes Yes efficiently? Does the remedial alternative require any permits and can the permits be No Yes Yes Yes acquired in a timely manner? Can the remedial alternative be implemented safely? Yes Yes Yes Yes Can existing infrastructure support remedial alternative? Yes Yes Yes Yes Can the remedial alternative achieve all applicable or reasonable and Yes Yes Yes Yes appropriate requirements (ARARs)? Prepared by: MT Checked by: KWW P:\Duke Energy Progress. 1026\109. Weatherspoon Ash Basin GW Assessment Plan\20.EG_CAP\CAP Part 2\Tables\Completed Tables 6-1 to 6-5.docx Page 1 of 1 TABLE 6-3 GROUNDWATER REMEDIATION ALTERNATIVE SCREENING - ENVIRONMENTAL SUSTAINABILITY W.H. WEATHERSPOON POWER PLANT DUKE ENERGY PROGRESS, LLC, LUMBERTON, NC Prepared by: MT Checked by: KWW P:\Duke Energy Progress. 1026\109. Weatherspoon Ash Basin GW Assessment Plan\20.EG_CAP\CAP Part 2\Tables\Completed Tables 6-1 to 6-5.docx Page 1 of 1 Alternative 1 Alternative 2 Alternative 3 Alternative 4 Environmental Sustainability Monitored Natural Phytoremediation Groundwater Groundwater Attenuation MNA Interceptor Trench Recovery Wells No -Will sequester No - Transfer to No -Transfer to Will treatment permanently destroy No COCs tree root, stem, reactive media biomass and NPDES target constituents? and leaf tissue biomass or NPDES outfall outfall Will treatment permanently reduce Yes Yes Yes Yes target constituent toxicity? Will treatment reduce the mobility No Yes Yes Yes of target constituents? Will treatment transfer target constituents from one media to No Yes Yes Yes another? Minimal Will sequester carbon in Steel manufacturing, Rank alternatives: carbon footprint (sampling required tree root, stem and leaf construction Energy for pumps for monitoring) tissues equipment Minimal Leaf litter Moderate Moderate Rank alternatives: waste generated (monitoring sample (if collection necessary) (monitoring waste, (monitoring waste, collection waste wastewater) wastewater Use existing Composted leaves for List opportunities for recycling or monitoring wells and cattle feed Use extracted water Use extracted water beneficial reuse required CCR Rule Harvest trees for pulp for irrigation during for irrigation during monitoring wells wood with natural growing season growing season regeneration List opportunities where renewable Passive solar energy sources of energy will be used. None No external energy None None inputs required List opportunities for habitat None beyond site High habitat creation, None beyond site None beyond site restoration, enhancement, or stabilization restoration, and stabilization stabilization replacement. enhancement value Prepared by: MT Checked by: KWW P:\Duke Energy Progress. 1026\109. Weatherspoon Ash Basin GW Assessment Plan\20.EG_CAP\CAP Part 2\Tables\Completed Tables 6-1 to 6-5.docx Page 1 of 1 TABLE 6-4 GROUNDWATER REMEDIATION ALTERNATIVE SCREENING - ESTIMATED COST W.H. WEATHERSPOON POWER PLANT DUKE ENERGY PROGRESS, LLC, LUMBERTON, NC Estimated Groundwater Remediation Alternative 1 Alternative 2 Alternative 3 Alternative 4 Cost Monitored Natural Phytoremediation Groundwater Groundwater Attenuation (MNA) Interceptor Trench Recovery Wells Capital Cost $156,400 $1,423,400 $6,397,100 $1,044,400 30 -year Monitoring, Operation, and $ 2,992,200 $5,302,400 $4 663,000 $5,186,300 Maintenance Cost , Total Cost $3,148,600 $6,725,800 $11,060,100 $6,230,700 Prepared by: MT Checked by: KWW P:\Duke Energy Progress. 1026\109. Weatherspoon Ash Basin GW Assessment Plan\20.EG_CAP\CAP Part 2\Tables\Completed Tables 6-1 to 6-5.docx Page 1 of 1 TABLE 6-5 GROUNDWATER REMEDIATION ALTERNATIVE SCREENING - STAKEHOLDER ACCEPTANCE W.H. WEATHERSPOON POWER PLANT DUKE ENERGY PROGRESS, LLC, LUMBERTON, NC Stakeholder Acceptance Alternative 1 Monitored Natural Attenuation (MNA) Alternative 2 Phytoremediation Alternative 3 Groundwater Interceptor Trench Alternative 4 Groundwater Recovery Wells Good High Moderately High Robust USEPA Aesthetic value Moderate Proactive approach Public acceptance regulatory evaluation habitat creation and Long time frame but generates and technical educational benefits wastewater justification provided discharge Good Moderately High Strong technical High Moderate Proactive approach Regulatory acceptance basis (USEPA MNA Successfully applied Challenges with but generates demonstration and at similar sites implementation wastewater risk assessment) discharge Prepared by: MT Checked by: KWW P:\Duke Energy Progress. 1026\109. Weatherspoon Ash Basin GW Assessment Plan\20.EG_CAP\CAP Part 2\Tables\Completed Tables 6-1 to 6-5.docx Page 1 of 1