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Presersed ai the 9th Natlonai Chadd r Aeon Con=ger,Las Yega4 Nev=4; May 1993 <br /> Enrzro-Core® Sampling System <br /> The Envtxo-Core system consists of small- <br /> dieter drive casing and an inner sample r---�`"' ' <br /> am <br /> ' aFUVE tea x WMOGEN <br /> barrel that are simuhm=uisly pushed, <br /> pounded, or vibrated into the ground- <br /> Continuous <br /> roundContinuous soil cores are collected in <br /> stainless steel liners inside the maser bagel. o, <br /> After being advanced three feet,the iaaGr ""��"Rops <br /> b=el is retrieved,while the drive casing is COMPOSME <br /> left in place to prevent the borehole from I -RONi°"` <br /> collapsing. The drive casing ensares that CA3 e <br /> subsequent soil samples are collected from <br /> the tarrgeted interval,rather than THREAD-ED THREADED <br /> s�E G�a+G �CASING <br /> ned slough from <br /> ' higher up in the borehole. <br /> The custom-made drive casing has an outer n PACXER <br /> (COUPLAS"Cpm <br /> diameter(OD) of 2 4 inches and is PA;MM TO OW <br /> machined into 3-foot long,threaded `ASWOM <br /> sections. A heat-trealed steel drive shoe is Cain =PLR <br /> wthreaded onto the bottom piece of drive <br /> casing, and a steel drive head is threaded co TA NG= <br /> EW STSa <br /> onto the top section of casing. Sr'"'` , s <br /> The inner barrel is made of a 3-foot-long <br /> section of 1.8 tach OD,thin-walled steel s''`°`DFUVE <br /> tubing The inner barrel has an OD <br /> slightly smaller than the inside diameter iNTERNAL INF AYABLE <br /> ' (ID) of the drive casing,to allow it to be Roo PACPaR <br /> raised and lowered freely inside the dnve M-z-rH°o METHOD <br /> casing, The bottom of the caner barrel <br /> nests on a shoulder cut into the dnve shoe_ Figure 1. The Euviro-Core® System <br /> The inner barrel contains six <br /> 1.7-inch-diameter by 6-inch-long stainless steel driers. A custom-made synthetic sample cawher <br /> is affixed to the bottom of the inner barrel to prevent loose sediments from falling out of the <br /> sample liners when the inner barrel is retrieved. <br /> t The inner barrel and drive casing are advanced into the ground simultaneously, requiting an <br /> effective means of coupling the inner barrel with the outer dnve casing. This is achieved is one <br /> of two ways. The fust method,refereed to as the internal rod method,uses:mbmnal steel rods to <br /> keep the inner sample barrel seated against the drive shoe (Figure i). The internal rods <br /> (three-foot sections of 1.35-inch-diameter steel EW sampling rods) serve several purposes_ First, <br /> they are used to lower the empty inner barrel to the bottom of the steel-cased borehole. Tben,the <br /> rods are placed in compression inside of the drive casing by attaching the drive head. This keeps <br /> 3 <br />