an industry review of data collection, evaluation and reporting … · 2017. 5. 30. · rocky...
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Rocky Mountain Arsenal National Wildlife Refuge
AN INDUSTRY REVIEW OF DATACOLLECTION, EVALUATION AND REPORTINGSTANDARDS FOR LEAK DETECTIONSYSTEMS AT HAZARDOUS WASTE LANDFILLFACILITIES and A REVIEW OF THE PRACTICEAT THE ROCKY MOUNTAIN ARSENAL
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• RMA Location and History• Hazardous Waste Landfill History and Liner
Design• Sources of Flow in the Leak Detection System• Regulatory Requirements for HWLs• LCS/LDS Monitoring Objectives at RMA• Study Results• Reasons to Consider LDS Monitoring
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HISTORY-• Established in 1942 by the Army• Chemical warfare agents/munitions/ World War II• 1946 Leased to private companies• 1952 to 1982 -Shell (manufactured industrial and
Agricultural chemicals including pesticides)• Contamination of structures, soil, surface water,
sediment, and groundwater.
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RMA Hazardous Waste LandfillRMA Hazardous Waste Landfill
• RMA is a EPA Superfund Site (CERCLA)• Corrective Action Management Unit (CAMU) –
CDPHE• Permanent landfill disposal facility• Waste from Remedial Implementation Projects
and other onsite sources• Approximately 1.2 million cubic yards
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Rocky Mountain Arsenal
HazardousWaste Landfill(Liner Design)
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Sources of Flow in Leak Detection SystemsSources of Flow in Leak Detection Systems
• Leakage through the top liner
• Construction water (water from precipitation oradded water that collects in the detection layerduring construction)
• Groundwater infiltration (not at RMA)
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Liquid in the LDS is to be expected and cannotby itself become the indicator of linerperformance.
How do we measure the liner performance?Action Leakage Rate (ALR)
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The ALR represents the capacity of the LDS totransmit flow and is independent of the sourcesof the liquids flowing into the system.
(Darcy’s Equation)
Q =
Q=TIWIf ALR is below the established rate, the linersystems are functioning correctly.
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Regulatory Requirements for HWLRegulatory Requirements for HWLMonitoringMonitoring
• No regulatory requirements to monitor thequality of the liquid in the LCS or LDS
• Quantitative evaluation for purposes ofARL compliance
• At RMA site specific Regulatory Agencyagreements mandate monitoring thequality of the liquid in the LCS/LDS
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LCS/LDS Objectives at RMALCS/LDS Objectives at RMA
• Analyze liquids in the LCS quarterly• Characterize leachate for treatment• Modify our analyte list in upgradient and
downgradient compliance monitoring wells
• Analyze liquids in the LDS quarterly• Same as above• Assist in determining whether groundwater
contamination is originating from the HWL or oneof the groundwater contamination sources at RMA
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HWL-Rocky Mountain ArsenalHWL-Rocky Mountain Arsenal
The ability todetect a leak in thelandfill was aconcern since thelandfill was builtnear pre-existinggroundwatercontamination.
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SurveySurvey
The survey studied LDS requirements, LDS datausage, and LDS reporting.
21 Hazardous Waste Facilities in the U.S.categorized as Subtitle C hazardous wastelandfills and holding current USEPAidentification numbers were identified for thisstudy.
14 Facilities in 9 States were available for theSurvey
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State Facility ALR LDS Monitoring
NOYESGrassy Mountain LandfillUT
NONOTexas Ecologist FacilityTX
YESYESDeer Park FacilityTX
YESYESHWY136TX
YESYESPinewoodSC
YESYESFernald LandfillOH
NO*YESLake Charles FacilityLA
YESYESPeoria DisposalIL
NOYESGrandviewID
YESYESDeer Trail LandfillCO
YESYESRocky Mountain ArsenalCO
NOYESWestmorelandCA
NONOButtonwillowCA
YESYESKettleman Hills LandfillCA
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How are facilities using LDS results…
• Characterize liquid for treatment• Additional data for specific reasons such as:
Pre-existing contaminationPotential for contaminant migrationHydrologic conditions – groundwater table
Data Reporting…Regulatory Agency
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Reasons to Consider LDS MonitoringReasons to Consider LDS Monitoring
• Relatively Inexpensive
• Prove landfill integrity
• Differentiate between pre-existing contaminationand landfill leakage
• Safeguard landfill owners in case contaminantsmigrate on-site
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SummarySummary
• The performance and integrity of a landfill is important for the environment, protection of human health, and as a landfillowner, environmental liability
• LDS ALR – Measure of landfill performance at most landfills
• Data from LDS liquid monitoring can be valuable
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Comments/Questions?
ROCKY MOUNTAIN ARSENAL NATIONAL WILDLIFE REFUGE