ARCHIVED REPORTS XR0008501 - Laserfiche WebLink

Home Browse Search

thoroughly sealed with duct tape, labeled, and placed on ice in a sealed chest . Unused core material and drill cuttings were Placed in metal barrels While the core was being examined, the second core barrel and metal tubes were cleaned as described above and set aside until needed. The core sample placed in the sealed bag was tested for the presence of hydrocarbons by placing the probe of a PID meter, (Thermo Environmental Instruments, Model 850B OVM, ) into the bag & observing the reading. Blow counts, PID readings, lithology, and other details are shown on PLATE X. Cores were taken at 5 foot intervals from 10 ' to 55 ' by the same field procedures described above. The core taken from 24 ' to 2516" had a slight petroleum odor in the bottom tube A sample placed in a plastic bag gave a reading of 14 ppm on the PID meter. No odors or readings were noted above that depth All the cores taken below that depth had a petroleum odor and gave positive readings on the PID meter. Water was encountered at 53 ' bgl, about 5 feet lower than measured in monitoring well #1 in March, but the same depth encountered in that well when first completed in October, 1994 . The augers were advanced to a depth of 63 feet, sediments consisted primarily of reddish brown to gray moist, sticky clay After reaching total depth, 211 , Sch. 40, flush, threaded PVC was made up and lowered to 63 , The bottom 20 ' consisted of 0211 , horizontal, shop cut slots with a screw-thread solid cap on bottom The remainder of the PVC was blank. The annular space between the auger flights & casing was filled with 7 1/2 sacks of #2 1/2 & #3 washed sand As sand was placed in the annulus, the height of the fill was continually checked with a weighted tape The casing was vibrated as sand was placed and auger flights withdrawn. When the sand pack had reached 401 , 3 feet above the top of the screen, one bucket of bentonite pellets was poured in the annulus & wetted with water. After verifying the top of the bentonite seal, the remaining flights were removed & the top of the well covered to prevent material from falling down the annulus . Refer to PLATE XIII for details of the well completion. While the auger flights were being decontaminated with steam cleaning equipment, the rig was moved to monitoring well #3 as shown on PLATE IV After breaking through 2" of asphalt, the augers were advanced to 9 ' and a clean core barrel was inserted into the flights and driven from 9 ' to 1016" . The barrel was retrieved, placed on a clean surface, and opened for inspection • The geologist described and preserved portions of the core in the 6