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B-180576 1 (1974-11-14)

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              . .                         WASHINGTON D.C.. 20548
 1
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               B-180576
                        B-180576NOV 14 1974
 I

               The Honorable M. Caldwell Butler
               House of Representatives

               Dear Mr. Butler:

                    Pursuant to your February 1, 1974, request and as agreed with
               you in our July 22, 1974, discussion, we are providing you with infor-
               mation relating to the geological problems associated with the Corps
               of Engineers' Gathright Dam and Lake project in Virginia.

                    We interviewed officials of the Corps' headquarters and Norfolk
               district offices, the JARFO Company (prime contractor engaged in the
               construction of the dam), and the Kemper-Frontier Construction
               Company (subcontractor) and reviewed pertinent records.
               BACKGROUND INFORMATION

                    The Flood Control Act of 1946 (Public Law 79-526, July 24, 1946)
               authorized the Gathright project to be developed as a multiple-
               purpose project for flood control, water quality, recreation, and
               power purposes; however, during project formulation in 1965, the
               Corps concluded that power facilities were not economically feasible
               and deferred their construction until they would become so. Corps
               officials said that there were no plans to further consider power
               facilities at this project.

                    Concerning the geological problems, a 1940 Corps geology report
               stated that there were solution cavities (water eroded caverns within
               the rock abutment) in the damsite area. The report concluded that
               extensive grouting' would be adequate to control the water seepage.
               A 1945 update of this report, before project authorization, resulted
               in the same conclusions. In 1965 the Corps began additional geologi-
*1             cal studies to develop data for project formulation. During stripping
               operations in 1968, one large cave and two smaller ones were uncovered
               leading the Corps to conduct further geological investigations.



               S1The process of drilling and then filling holes with concrete under
               pressure to seal joints and cracks in the rock.

               0.963

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