www.energy.gov/em 1 aggregate areas david s. rhodes acquisition integrated project team chair...
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www.energy.gov/EM 1
Aggregate Areas
David S. RhodesAcquisition Integrated Project Team Chair
Environmental Management Los Alamos Field Office
March 3, 2015
www.energy.gov/EM 2
Division of Drainages
Plateau dissected by nineteen major surface drainages or canyons and their tributaries running roughly west to east or southeast and drain into the Rio Grande
Many drainages large enough to split into sub-areas: upper/middle/lower
Thirty aggregate areas (AA) identified in Consent Order • Ten AAs completely investigated• Ten AAs in-progress with partial investigations and some cleanup work• Ten AAs not yet investigated (no cleans conducted)
www.energy.gov/EM 4
RCRA Process
Investigation Work Plan (IWP)• IWP to NMED for plan approval
Field characterization activities• Field Screening• Sampling to off-site analytical laboratories
Field cleanup of sites above soil screening levels• Cleanup while crews in field
Identify constituents of potential concern (COPC)
Risk assessment of results• Identification for cleanup of site with risk above thresholds
Investigation Report (IR)
www.energy.gov/EM 5
In-progress examples
Historical Townsites• Private property sites provide access to remaining canyon-side sites• Los Alamos County property containing wetlands and sites• Commercial development sites provides access to remaining canyon-side sites
Upper Los Alamos Canyon• Former sites’ stack discharge locations/outfalls into canyon• Heaviest discharges of uranium and plutonium contaminants• Lead-contaminated soils beneath bridge
Middle Los Alamos Canyon• Outfall sediment reaches
Lower Los Alamos Canyon• Sediment reaches and canyon bottom areas of concern (AOC)• Sediment transport mitigations
www.energy.gov/EM 6
In-progress cleanup pics
PCB contaminated soil removal TA-61
North Ancho Remediation
Sandia Canyon Wetland Stabilization
Spider Excavator on Canyon Edge
www.energy.gov/EM 7
Supplemental Investigation ReportsSupplemental Investigation Reports
Ongoing effort to update Supplemental Investigation Reports (SIRs) with a Risk Assessment addendum• Five SIRs in FY2015
• Two submitted to NMED – no comments received on SIRs• Preparing three more
• Six SIRs in FY2016• Dependent on funding and priority• Likely will slide 2-3 into FY2017
• Could result in hundreds of certificates of completion (CoC) without additional cleanups
www.energy.gov/EM 8
Specific site cleanupsSpecific site cleanups
19 sites identified as above soil screening levels from previous investigations
Additional sites are expected to exceed soil screening levels and will need to be cleaned • It is anticipated that these additional sites will be generally consistent from
aggregate area to aggregate area, including:• Leaking septic system piping• Leaking small laboratory drain lines
Document specific site cleanups in investigation reports• Should lead directly to CoC
www.energy.gov/EM 9
Complete remaining investigationsComplete remaining investigations
Review of historical investigation information (pre-Consent Order)
Some have IWPs; others do not• Develop and submit to NMED for approval• Leave latitude to go back into field to close gaps without having to request
permission (work-at-risk)
Contract or conduct field sampling activities• Field screening important to close gaps• Did we go wide enough or deep enough?• Conduct field cleanups as investigation progresses
Assess risk of resulting/remaining contaminants Document in investigation reports