Operated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSA U N C L A S S I F I E D Integrated Post-Las Conchas Monitoring Los Alamos National Laboratory Buckman Direct Diversion Board Monthly Board Meeting October 6, 2011

Operated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSA LA-UR U N C L A S S I F I E D Integrated Post-Las Conchas Monitoring - Los Alamos National Laboratory Multiple Organizations are collecting data NMED Buckman LANL Albuquerque Water Utility Integration Data collection methodologies — How to effectively collect samples under challenging conditions — Comparable data sets enable integration for risk assessment Coverage across the burn area — LANL (upstream and downstream) — Rio Grande — Elsewhere below burn area Data Types — Storm water runoff — Sediment — Rio Grande

Operated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSA LA-UR U N C L A S S I F I E D Integrated Post-Las Conchas Storm Water Monitoring - Project Goals Goal of Integrated Monitoring Effort Establish a data set that enables assessment of risks and guides actions to protect water resources, and human and ecological health Inter-Agency Flood Risk Assessment Team LANL goals Evaluate potential LANL contributions to contamination observed in storm water, and Take actions necessary to mitigate risks and repair damage associated with post-fire runoff

Operated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSA LA-UR U N C L A S S I F I E D LANL sampled from areas upgradient (unaffected) by LANL operations to characterize “natural” constituents in ash and soils Some interior sampling stations were damaged by August floods. Boundary stations all remain operational Slide 4 Integrated Post-Las Conchas Storm Water Monitoring – LANL Sampling Plan SAP map here Los Alamos Canyon Water Canyon Pajarito Canyon BDD

Operated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSA LA-UR U N C L A S S I F I E D Integrated Post-Las Conchas Storm Water Monitoring – Samples Collected by LANL to Date LANL has collected samples from 21 different days with runoff Samples collected from: Locations upstream (unaffected) of LANL operations — Helps characterize constituents found in ash and mountain soils Canyons immediately north and south of LANL, also unaffected by LANL operations — Helps characterize constituents found in ash and mountain soils — Helps understand how concentrations in runoff change downstream from burn area Downstream LANL boundary locations above and below Buckman Diversion — Only Los Alamos Canyon joins the Rio above Buckman

Operated by Los Alamos National Security, LLC for the U.S. Department of Energy’s NNSA LA-UR U N C L A S S I F I E D Integrated Post-Las Conchas Storm Water Monitoring – Sample Results Overview Constituents observed at locations unaffected by LANL are consistent with observations from similar locations after Cerro Grande Some results exceed State water-quality standards Cyanide, Dioxins/Furans – source is combustion of organic material in burn area Metals – source is plant uptake of constituents found in soils Radionuclides, PCBs – concentrated from global fallout deposited on forest floor Observations at lower LANL boundary locations, including E109.9 Cyanide and PCB concentrations are generally lower. Some still exceed standards Metals, Radionuclides, Dioxins/Furans – similar concentrations as samples above LANL Results received to date are in RACER, remainder within several weeks Data is being integrated with NMED, BDD, and Albuquerque water utility for use in IFRAT Risk assessment