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■ <br /> *PBECr <br /> ��SION TFCHIVICA L MOTE No. Z <br /> The Envlro-Core® Sampling System <br /> The Enviro-Core" system is a patented dual-tube or outside diameter (OD) and is machined into 3-toot-long, <br /> "cased"direct push sampling system developed by flush-threaded sections. A heat-treated steel drive shoe is <br /> Precision Sampling. Enviro-Core uses small-diameter threaded onto the bottom piece of drive casing, and a steel <br /> drive casing to prevent the probe hole from collapsing drive head is threaded onto the top section of casing <br /> between sampling runs,thereby eliminating the potential (Figure 1), <br /> for cross-contamination of soil samples. Enviro-Core also <br /> allows soil gas sampling, groundwater sampling, monitor- The sample barrel is made of a 3-loot-long section of <br /> ing well installation, and reliable retraction grouting. thin-walled steel <br /> tubing. The <br /> FRI I DRIVE HEAD� <br /> The Enviro-Core system consists of small-diameter drive sample barrel <br /> casing and an inner sample barrel that are simultaneously has an OD <br /> THREADED <br /> pushed, pounded, or vibrated into the ground(l). Soil slightly smaller INTERNAL RODS <br /> cores are collected in liners inside the sample barrel. than the inside <br /> After being advanced three feet, the full sample barrel is diameter(ID)of <br /> retrieved, while the drive casing is left in place to prevent the drive casing <br /> the probe hole from collapsing. The drive casing to allow it to be �DE THREADED _ <br /> ensures that subsequent soil samples are collected raised and <br /> from the targeted interval, rather than potential ly-contami- lowered freely <br /> nated slough from higher up in the probe hole. inside the drive <br /> casing. The COUPLER <br /> The system is most often used for collecting continuous bottom of the <br /> soil cores, however, use of an internal retractable"dis- sample barrel srals IF L <br /> LINERS <br /> placement point"allows depth-specific"discrete coring" rests on a <br /> (Figure 1). Attached to the internal threaded rods,the shoulder cut into DISPLACEMENT <br /> POINT <br /> displacement point allows the Enviro-Core to be advanced the drive shoe. DRIVE SHOE-], <br /> through soil without collecting any soil cores. Water-tight The sample <br /> seals affixed to the end of the displacement point prevent barrel contains DISPLACEMENT SAMPLING <br /> MODE MODE <br /> water or soil from entering the Enviro-Core drive casing. six 6-inch-long <br /> Once the top of the desired sampling interval is reached, stainless steel <br /> the displacement point is removed and replaced with a Figure 7 -Envira-Core Sampling <br /> p p P liners or one System <br /> sample barrel.Continued advancement forces soil up clear plastic <br /> inside of the sample barrel. After soil cores have been liner. Split sample barrels are also available. Soil cores up <br /> collected from the desired interval,the displacement point to 2.6 inches in diameter can be collected with the Enviro- <br /> can be re-inserted, and the Enviro-Core drive casing Core system.A synthetic sample catcher is affixed to the <br /> quickly advanced to the next sampling depth. bottom of the sample barrel to prevent loose sediments from <br /> falling out of the sample liners when the sample barrel is <br /> The drive casing is available in sizes up to 3.5 inches retrieved. <br /> w <br /> INNOVATORS IN DIRECT PUSH TECHNOLOGY <br /> CORPORATE HEADQUARTERS - 47 LOUISE STREET, SAN RAFAEL, CALIFORNIA 94901 800.677.4744 <br /> www.precisionsampling.com <br />