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3arrel is then secured to the bottom of the conduit to the bottom of the boring, it is an hive casing. An additional three-foot section Tp WINCH ideal tremie pipe. For grouting shallow r----- )f sing is attached at the surface, NITROGEN borings, a bentonite orcement-bentonite ollowed by re-attachment of the drive head. CYLINDER slurry is poured into the drive casing from rhe sample barrel and drive casing are the ground surface as the casing is re- ;imultaneously advanced three more feet, tracted. Grouting as the drive casing is Ind then the sample barrel is again de- retracted is referred to as"retraction coupled and removed from the drive casing. grouting"and is preferred by most state and chis process is repeated until the desired SUSPEN SIONr local regulatory agencies. In deeper iepth is reached. CABrfTI°N borings, retraction grouting is accomplished by pumping grout to the bottom of the boring Small-diameter single-or multi-level piezom- through polyethylene tubing placed inside of iters, monitoring wells, air sparging points, DERIIVEACASiNG the drive casing. The grout slurry is pumped and soil vapor extraction (SVE)wells can be as the drive casing is pulled back, ensuring a nstalled in the probe holes as the Enviro INFLATABLE high-quality seal. :Are drive casing is withdrawn. PACKER (COUPLES BSAMPLE ARREL Tp REFERENCE- 3robe holes that are not converted to DRIVE (1) Einarson, Murray D. 1995. Enviro- nonitoring or remediation devices need to be COreO-A New Direct-Push Technology for >ealed in accordance with state and local COUPLER Collecting Continuous Soil Cores, in -egutations to prevent contaminant migration. Proceedings of Ninth National Outdoor Jkfter the last soil core has been collected Action Conference & Exposition, May 2-4, and the sample barrel has been removed, 1995, Las Vegas, Nevada. pp 419-433. only drive casing remains in the ground. Sin a drive casing provides an open Figure 3-Packer used to couple inner barrel to outer drive casing ADVANTAGES OF ENVIRO-CORL-V ■ Drive casing prevents probe hole from collapsing ■ Can collect depth-discrete soil gas samples between sampling runs ■ Can collect groundwater samples with bailer or ■ Eliminates cross-contamination of soil samples bladder pump ■ Facilitates rapid continuous soil coring IN Can install single or multi-level monitoring wells ■ Allows efficient"discrete sampling"of specific IN Can install sparge points or other remediation depth intervals devices ■ Collects soil cores as large as 2.6-inches in IN No deflection of probe rods as with other smatter- diameter for chemical or geotechnical analyses diameter DP systems ■ Collects soil cores in stainless steel sleeves, ■ Facilitates geophysical logging in a cased hole clear plastic liners, split-barrels, or thin-walled tubes ■ Allows reliable retraction grouting through the drive casing ■ Rugged components allow deeper sampling than with other direct push systems 0 Ideal for geotechnical investigations