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Supplementary Remedial Investigation/Feasibility Study of Umatilla Depot Activity, Hermiston, Oregon. Intermediate and Alluvial Well Installation Report. Site 4, Explosive Washout Lagoons
Final rept. 3 Jul 1991-Feb 1994
DAMES AND MOORE LINTHICUM MD
Pagination or Media Count:
The Intermediate and Alluvial Well Installation Report for Site 4, Explosive Washout Lagoons, Umatilla Depot Activity UMDA, Hermiston, Oregon, has been prepared for the U.S. Army Environmental Center USAEC under the Base Realignment and Closure BRAC Program. The report documents the methods used to install four intermediate wells and two alluvial wells at Site 4 and the hydrogeologic conditions encountered. The wells were installed to 1 further assess the stratigraphy beneath Site 4 2 assess the degree of interconnection between the basalt and the overlying alluvial sediments 3 document water quality within the intermediate zone and further delineate explosives and nitratenitrite contamination within the alluvial aquifer and 4 document horizontal and vertical groundwater flow patterns within the intermediate zone. Monitoring well installation, Hydrogeology investigation, Remedial investigationfeasibility study.
APPROVED FOR PUBLIC RELEASE