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Permit SB2000348 at 25 M Street Southwest, Washington DC, DC, 20024

Issue Date
05/22/20

Type
Permit

Docnumber
SB2000348

County
Washington

Description

We propose drilling a total of one (1), six-inch diameter geotechnical test borings (B-8) using the hollow stem auger method to evaluate the subsurface conditions. The proposed test boring depths will be approximately 50 feet below the ground surface elevation. If a confining unit is encountered, outer casing will be installed which will extend 10 feet into the top of the confining unit or to the top of bedrock. Upon completion, each geotechnical test borings will be backfilled immediately wi...We propose drilling a total of one (1), six-inch diameter geotechnical test borings (B-8) using the hollow stem auger method to evaluate the subsurface conditions. The proposed test boring depths will be approximately 50 feet below the ground surface elevation. If a confining unit is encountered, outer casing will be installed which will extend 10 feet into the top of the confining unit or to the top of bedrock. Upon completion, each geotechnical test borings will be backfilled immediately with grout to the existing ground surface. The borehole will be tremie-grouted in one continuous operation with a positive displacement pump using a bentonite slurry mix (at least 2 pounds bentonite powder to 1 gallon of water) from the bottom of the borehole upward. Drilling spoils including soils and water from the test borings will be containerized in 55-gallon drums to be removed for disposal after chemical laboratory results of the spoils have been received and reviewed. Spoils will be disposed of in accordance with Federal and District laws and regulations.
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