ARCHIVED REPORTS XR0005792 - Laserfiche WebLink

Home Browse Search

r Augers were advanced to 20' ; drill cuttings consisted primarily ' of tan to brown clay and sandy clay. The cleaned sample barrel was lowered to bottom, and was driven from 20' to 21' 6" with blow counts of 4-9-10 . Recovery was 15" of gray to dark gray clay & sandy clay, grading to a sticky plastic greenish-gray clay. A ' strong petroleum odor & staining was evident in the upper part of the core. The middle tube was sealed and preserved as described previously. When drilling was resumed, the driller noted a change in pene- tration nate, and it was decided to take another core at 23' due ' to the proximity to groundwater. The sampler barrel was prepared & lowered to bottom at 23' 6" ; it was advanced to 25' with blow counts of 10--17-22. When the core barrel was retrieved and opened, it contained a full 18" of coarse, loose water sand. A ' distinct petroleum odor was noted, but no sheen or rainbow was seen when a portion of the cored material was placed in a con- tainer of water. The bottom tube was sealed and preserved using 1 the same procedures as other samples. A tape was lowered into the hole and indicated the top of water at 23' , which was in close agreement with MW #2. The hole was advanced to 33' -- drill cuttings consisted of very wet, medium to coarse-grained water sand. rRefer to PLATE VIII for a lithologic plot of the well . ' 2" OD, flush screw joint PVC casing was run in the hole; the bottom 15' was shop-made slots, and the rest blank. The perfor- ations were sand-packed with 6 sacks of #2 1/2 RMC gravel, and capped with one bucket of bentonite pellets and sufficient water ' to insure a proper seal. The top of the casing was covered to prevent debris from entering, but the annulus was not cemented Refer to PLATE XI for a schematic showing completion details. The rig was then spotted on the location marked for monitoring well #3, (MW-3, ) but due to interference of overhead power lines, ' it was necessary to relocate the well to the north east; PLATE VI shows the location originally selected, andEj TE VII shows the final location. After cutting a hole in the asphalt, new auger flights were advanced to 5' ; cuttings consisted dark tan to brown clay, sticky & slightly plastic. A clean sample chamber was inserted into the ' flights, and the core barrel was driven from 5' to 6' 6" with blow counts of 3-4-7. Recovery was a full 18" , and consisted of brown mottled clay, slightly plastic, damp but not moist. No odors 7