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MANDAN DIESEL FUELREMEDIATION PROJECT
PRESENTATION FOR
JANUARY 22, 2020
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SITE HISTORY
• 1984 - DISCOVERED FUEL IN CONSTRUCTION OF MANDAN LAW ENFORCEMENT CENTER
• FUEL CAME PRIMARILY FROM BURLINGTON NORTHERN FUELING OPERATIONS
• 1985 - STATE ORDERS RAILROAD TO BEGIN REMOVING PRODUCT
• 2000 - REMEDIAL EFFORTS CEASE – RAILROAD CONTESTS RESPONSIBILITY FOR THE SPILL
• 2002 - STATE OF ND AND CITY OF MANDAN SUE RAILROAD
• 2004 - PARTIES AGREE TO A SETTLEMENT THAT INVOLVES $30.25M IN CASH AND REAL ESTATE FROM THE RAILROAD.
• MANDAN REMEDIATION TRUST CREATED
• $24M FOR CLEANUP
• 2005 – MANDAN REMEDIATION TRUST SET UP TO OVERSEE THE CLEANUP OF THE FUEL
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WHERE DID THE PRODUCT COME FROM?
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HISTORICAL MAXIMUM PRODUCT THICKNESS
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SETTLEMENT AGREEMENT
• THE PRIMARY PROJECT OBJECTIVES ARE TO:• REMOVE FREE-PHASE DIESEL
• PROTECT HUMAN HEALTH
• FACILITATE THE REDEVELOPMENT OF DOWNTOWN MANDAN
• THE SECONDARY PROJECT OBJECTIVES ARE TO:• COMPLETE THE REMEDIAL ACTIVITIES IN A MANNER THAT MINIMIZES
INTRUSIVENESS
• DEVELOP REMEDIATION STRATEGIES THAT WILL MINIMIZE COST TO PRESERVE THE REMEDIATION TRUST
• $24 MILLION FOR SITE REMEDIATION
• 300+ REMEDIAL WELLS INSTALLED (39 IN BASEMENTS)
• 3 REMEDIAL BUILDINGS ERECTED
• 20 MILES OF PIPE BURIED
• 11 REMOTE MANIFOLDS CONSTRUCTED
• 1 GROUND-WATER TREATMENT SYSTEM CONSTRUCTED
• 3 EXTRACTION SYSTEMS CONSTRUCTED
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MULTI PHASE EXTRACTION
WELL
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WELL INSTALLATION
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INTERIOR WELL AND PIPING
INSTALLATION
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PIPING INSTALLATION
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WELL RADIUS OF INFLUENCE
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TREATMENT FACILITY
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WASTE WATER TREATMENT
SYSTEM SCHEMATIC
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PRODUCT THICKNESS 2005
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PRODUCT THICKNESS 2010
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PRODUCT THICKNESS 2015
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PRODUCT THICKNESS 2019
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TOTAL VOLUME
OF PETROLEUM RECOVERED
• FREE PRODUCT RECOVERY – 734,681 GALLONS
• VAPOR PHASE RECOVERY – 34,910 GALLONS
• TOTAL PRODUCT RECOVERY – 769,591 GALLONS
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CURRENT SITE CONDITIONS
• SHUT DOWN ALL SYSTEMS IN 2018
• 2019 MONITORING
• WILL CLOSE AND DISMANTLE SYSTEM IN 2020
• SOME MONITORING WELLS WILL BE KEPT AND SITE CONDITIONS WILL CONTINUE TO BE MONITORED IN 2020
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SITE CLOSURECONSIDERATIONS
• PRODUCT THICKNESS IN MONITORING WELLS IS LESS THAN 1/10 OF A FOOT
• DECREASING AND/OR ASYMPTOMATIC SOIL VAPOR EXTRACTION MASS REMOVAL RATES
• NO PETROLEUM ODOR COMPLAINTS IDENTIFIED
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SITE CLOSUREPROPOSAL
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THANK YOU