Laserfiche WebLink
were 1-2-2 The core barrel was retrieved, placed on a clean <br /> work surface and the core head removed The barrel was opened <br /> and the metal tubes were carefully placed on a clean surface by <br /> the geologist, Wm Hunter Recovery consisted of 15" of dark <br /> brown wet clay, grading to fine to-medium grained sand The <br /> middle tube was promptly sealed by covering the ends with teflon <br /> tape & plastic end caps & wrapping with duct tape The tube was <br /> labeled and placed on ice The remaining core material was <br /> described and closely examined, and then placed in the metal drum <br /> with the drill cuttings While the geologist was describing and <br /> pre- serving the core, the other core barrel was cleaned and <br /> filled with metal sleeves, and set aside until needed <br /> Additional cores were taken from 1010" - 111611 , and 151011- 1616" <br /> using the same procedure as described earlier The cores were <br /> examined, logged, and preserved per standard WJH field proce- <br /> dures Refer to PLATE VIII for a complete description of blow <br /> counts, recovery, lathology, and other pertinent details The <br /> augers were then advanced to 25 ' bgl preparatory to running <br /> casing for completing as a groundwater monitoring well <br /> 211 <br /> , Sch. 40, flush screw-thread PVC casing was assembled and <br /> lowered into the auger flights the bottom 20 feet consisted of 3 <br /> rows of 020" horizontal machine cut slots with a solid screw-on <br /> cap on bottom; the top 5 feet was blank The casing was landed <br /> at 25 , bgl, with the top of the screened interval at 5 feet below <br /> ground level The annular space between the auger flights & <br /> casing was filled with #3 SRI graded gravel which was poured from <br /> the surface. The casing was continually vibrated during place- <br /> ment to prevent the possibility of bridging. The depth of the <br /> gravel was checked with a weighted tape, as the annular space <br /> filled, auger flights were withdrawn from the hole. A total of 8 <br /> sacks of sand was used to fill the annulus When the sand pack <br /> had reached 3 1/2 feet, 1/2 bag of bentonite pellets was poured <br /> down the annulus and located at 2 feet below grade It was <br /> wetted with approximately 2 gallons of water The casing & hole <br /> were covered awaiting grouting at the completion of operations <br /> Refer to PLATE VIIIA for a schematic diagram of completion <br /> details <br /> While the rig was relocated to the site for monitoring well #1, <br /> (see PLATE VI, ) the previously used auger flights were decontami- <br /> nated After cutting through the asphalt, drilling commenced at <br /> 1158 hours using clean augers Surface sediments consisted of <br /> sandy clay grading to sticky black clay loam At a depth of 5 <br /> feet, the drill plug was removed and a clean core barrel was <br /> lowered into the augers It was driven from 5 ' bgl to 6161" with <br /> • the drive hammer, blow counts were 7-12-17 The core barrel was <br /> 6 <br />