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Permit SB2100355 at 801 17Th Street Northeast, Washington Dc, DC, 20002

Issue Date
09/13/21

Type
Permit

Docnumber
SB2100355

County
Washington

Description

ECS will advance a total of five (5) borings at the property at the locations depicted on Figure 1. Borings will be advanced using a track-mounted, Geoprobe Direct-Push drill rig. Borings will be advanced to a maximum depth of 30 feet below ground surface, or until a confining layer below saturated soil is encountered, or until probe refusal is encountered, whichever occurs first. The Geoprobe uses a hydraulic hammer to push a 2.5-inch diameter steel rod with a clear PVC sleeve into the grou...ECS will advance a total of five (5) borings at the property at the locations depicted on Figure 1. Borings will be advanced using a track-mounted, Geoprobe Direct-Push drill rig. Borings will be advanced to a maximum depth of 30 feet below ground surface, or until a confining layer below saturated soil is encountered, or until probe refusal is encountered, whichever occurs first. The Geoprobe uses a hydraulic hammer to push a 2.5-inch diameter steel rod with a clear PVC sleeve into the ground in five-foot increments. The macrocore is then withdrawn from the ground and the sleeve removed, which contains a relatively undisturbed soil core. The sleeve is cut open allowing examination of the entire soil core, and sampling of soil from the core sample. If unusual obstructions or suspicious voids are encountered, or other observations that may be considered evidence of an Underground Storage Tank (UST), the boring will be halted in that location, and may be offset to avoid puncturing an existing tank. A dual tube Geoprobe sampling system will be utilized to drill all environmental borings on the site, consisting of an outer steel tube which acts as a casing for the boring, and an inner sampling tube to prevent potential vertical migration of potential contaminants. The casing will be removed prior to abandoning each boring. Discrete soil samples will be screened in 2.5-foot intervals throughout the depth of each boring. Each sample will be screened for the presence of volatile organic compounds (VOCs) using a photoionization detector (PID) equipped with a 10.6 electron volt lamp. Soil tailings, and other Investigation Derived Wastes (IDW) will be containerized for appropriate disposal offsite. Assuming that the IDW is not found to contain RCRA-regulated hazardous wastes, ECS will arrange to have the drums picked up and disposed offsite. The drums will be temporarily staged on the property pending disposal. Any non-disposable equipment used will be decontaminated with a mixture of potable water and Alconox and rinsed with potable water. This will include EIPs and submersible pumps. New, polyethylene tubing will be used at each well. Following completion, the borings will be tremie grouted with a bentonite-cement mixture as required by DOEE, and asphalt as needed. The grouting mixture will be bentonite slurry with a 2:1 ratio of 2 lb of bentonite powder and 1 gal of water. All soil and water generated as part of the sampling activities will be collected into 55-gallon steel drums awaiting proper disposal.
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