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Permit SB2000301 at 1313 L Street Northwest, Washington DC, DC, 20005

Issue Date
06/03/20

Type
Permit

Docnumber
SB2000301

County
Washington

Description

We propose drilling three (3), seven-inch diameter geotechnical test borings (B-1 to B-3) using the hollow stem auger method to evaluate the subsurface conditions. The proposed test boring depths will be 30 to 40 feet below the existing ground surface. 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, whichever is encountered first. Upon completion, the geotechnical test borings will be bac...We propose drilling three (3), seven-inch diameter geotechnical test borings (B-1 to B-3) using the hollow stem auger method to evaluate the subsurface conditions. The proposed test boring depths will be 30 to 40 feet below the existing ground surface. 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, whichever is encountered first. Upon completion, the geotechnical test borings will be backfilled with grout to the existing ground surface within 24-hours. 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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