ARCHIVED REPORTS XR0001000 - Laserfiche WebLink

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• 2" blank & slotted, flush screw -point casing was landed at 381, the bottom 20' consisted of 020" horizontal machine cut slots, the rest was blank The annulus was filled with 7 sacks of #3 washed sand as described above After verifying the top of the sand at 161, (2 feet above the top of the perforations,) one bucket of bentonite pellets was placed on top of the sand and wetted with clean water. The top of the seal was located at 14' details of the well completion are given on PLATE XIV -A After completion of the above operation, the crew blended a cement/bentonite slurry in a mixing tank equipped with paddles to ensure proper consistency The annular space between the 2" casing and hole was filled with the slurry by use of a tremae pipe & flexible hose The same procedure was used to grout monitoring wells #2, #3, & #4 The cementing operationswere witnessed by a repesentative of the San Joaquin County EHD Preformed cast vaults were installed on each well & thoroughly cemented in place The tops of the casings were cutoff about 6" below the top of the vault, and sealed with expandable locking caps The preserved soil samples were stored overnight in a sealed ice chest pending transfer to Sherwood Laboratory for analysis All drill cuttings and unused core material were placed in metal drums, tightly sealed and labeled, and stored on location pending disposal. Operations were suspended for the night On July 6, 1995, MDE equipment & crew were mobilized on the location marked for auger hole "D" as shown on PLATE X This location is in the center of the product lane which lead from the UST's to the fuel dispenser located in the building After discussing the procedures, drilling began at 0900 hours under the supervision of Wm Hunter, and assisted by Don Light The first core was taken from 5'-61611, it was handled, described, screened & preserved following the same field protocol used for the monitoring wells Additional cores were taken from 10-11'6", 15'-16161-, 20'-211611, and 251-261611, they were processed in the same manner as the first core There were no odors or visible evidence of contamination, and PID readings were zero (0) for all screened samples Refer to PLATE XV for details of blow counts, core recovery, & lithologic descriptions Drill cuttings and unused core materials were placed in metal drums, clearly labeled & sealed & stored on site pending disposal The hole was securely covered pending grouting after completion of the work Whale the auger flights were being decontaminated, the rig was mobilized on location "C" at the west end of the product line as shown on PLATE X Drilling began at 0950 hours under the direction of Mr. Hunter Surface materials consisted of rocks, `3