Allegheny Instruments, Inc.

Part 3 of 3 Tectonic Breccia as Barrier to Groundwater Flow Video

PART 3 of 3 - This video examines an interval from 235 ft - 308 ft (bottom of well) below ground surface in Virginia State Observation Well 009 in Pulaski County as recorded by DEQ Groundwater Characterization staff on 3/25/08. The video examines a portion of the Peak Creek Fault - part of a system of paleozoic faults that displaced bedrock westward in response to continental collision. The video shows a continuous interval of poorly sorted angular to rounded breccia consisting of carbonate, shale and chert pebbles to boulders in a gray carbonate cement. This unit is believed to be the Max Meadows Tectonic breccia as mapped by Shultz, A.P. and Bartholomew, M.J. ( VDGMR Open File Report 10-08). The Max Meadows breccia is thought to have been a hydrolyzed slurry along which the fault moved. No water bearing zones were reported from the brecciated interval indicating that the fault may be acting primarily as a barrier to flow in this area. Total reported yield for this well was 75 GPM when drilled in the 1964. The former supply well is located 37.0483672797222 / -80.6286453333333 NAD83 and is currently a state observation well used for drought monitoring.

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