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Comparison of the Water Balance of an Asphalt Cover and an Evapotranspiration Cover at Technical Area 49 at the Los Alamos National Laboratory

^a Energy and Environmental Engineering Division, Apogen Technologies, Inc., 1350 Central Avenue, 3rd Floor, Los Alamos, NM 87544
^b Risk Reduction and Environmental Stewardship—Remediation Services, Los Alamos National Laboratory, P.O. Box 1663, MS M992, Los Alamos, NM 87545
^c Risk Reduction and Environmental Stewardship—Environmental Characterization and Remediation, Los Alamos National Laboratory, P.O. Box 1663, MS H865, Los Alamos, NM 87545

View larger version (42K): [in a new window]   Fig. 1. Location of Technical Area 49 and the Los Alamos National Laboratory.

View larger version (49K): [in a new window]   Fig. 2. Location of areas and potential release sites at Technical Area 49.

View larger version (145K): [in a new window]   Fig. 3. Aerial photograph of the asphalt cover at Area 2, TA-49 (photographed in 1998).

View larger version (32K): [in a new window]   Fig. 4. Stratigraphy and soil water contents encountered during coring of the three boreholes through the evapotranspiration (ET) cover in 1998. The green lines indicate original ground surface and "1998 Cover Material" refers to the ET cover installed in 1998. Layers between the 1998 cover material and original ground surface are the remnant layers from the pre-1998 cover.

View larger version (116K): [in a new window]   Fig. 5. Photograph of ET cover (facing west) taken 2 Sept. 2004.

View larger version (141K): [in a new window]   Fig. 6. Photograph of ET cover taken 2 Sept. 2004. Neutron logging Borehole 49-10048, PVC protection for wires from TDR West station, and the galvanized steel bio-intrusion mesh can be seen in the photograph.

View larger version (147K): [in a new window]   Fig. 7. Aerial photograph of Area 2 showing locations of the neutron logging boreholes, the two boreholes sampled in 1994 (49-2906 and 49-2907), CH-2, the four TDR probes, and the extent of the bio-intrusion barrier.

View larger version (34K): [in a new window]   Fig. 8. Soil water contents from TDR measurements within the ET cover from April 2000 to October 2004 with monthly precipitation totals.

View larger version (25K): [in a new window]   Fig. 9. Soil water contents measured from ET cover core samples and neutron logging CH-2 (1998) and from neutron logging three boreholes in the ET cover (average of 2004 measurements).

View larger version (28K): [in a new window]   Fig. 10. Water content measurements (average of 1999–2004) from neutron logging the TH (undisturbed conditions) and 2A/2B (disturbed conditions) boreholes, and water content measurements from core samples collected in 1994 from Boreholes 49-2906 and 49-2907.