Laserfiche WebLink
• <br />1lmito~ag Wdl Indaaatim - Dome PIW <br />3.0 DRILLING ACTIVITIES <br />Drilling activities were performed by Empire Laboratories, Inc., of Ft. Collins, Colorado, using <br />a CME-55 auger drilling rig, with continuous flight, 6 3/4-inch diameter hollow stem augers. <br />Augers and drill bits were steam cleaned before drilling each monitoring well. Split spoon <br />samples were collected at 5 Ceet depth intervals during drilling. Drilling logs for each well are <br />provided in Appendix A. The split spoon sampler was field cleaned with non-phosphate soap and <br />deionized water before the collection of each sample. Split spoon samples were field screened <br />using an Hnu photoionization detection device, equipped with a 10.2 Ev probe, calibrated to a <br />benzene standard. This device measures ionizable organic gases such as those emitted from <br />gasoline, solvents, and other volatile organic compounds. <br />WeII DFMW -I <br />Monitoring well DFMW-1 was drilled to a depth oC 30-feet. Split spoon samples and auger <br />cuttings indicated that dark loam extends from the surface to a depth of 4 feet. The loam is <br />underlain by approximately 3 feet of light gray clay, and interbedded yellow and brown clays, <br />containing well rounded sand. The clays are underlain by 3 feet of dry, gray siltstone, which <br />• is underlain by roughly 5 feet of moist brown to black clay containing traces of bentonite and <br />angular sand. Water was encountered at a depth of 15 feet. A saturated, black clay layer, IS- <br />feet thick, graded into a dry, gray claystone at a depth of 30 feet. <br />No unusual soil staining or odors were observed in the upper IS feet of DFMW-l. Hnu readings <br />of split spoon samples collected at 5, 10, and IS feet, were indicative of background soil <br />conditions (0.5 ppm total ionizable constituents). Strong organic odors, possibly natural <br />petroleum, were noticed in the saturated black clay layer that extended from depths of IS to 30 <br />feet. No sheen was observed on the water surface. Hnu readings from this interval ranged from <br />10 to 30 ppm. These readings will be further evaluated when laboratory results of water quality <br />sampling are available. <br /> Project Numbs TBB-97-0If <br /> 7u¢ 11, 19G0 <br />. Pege 2 <br />