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NonitQios Wdl Iml~a~tim -Dove YID <br />• <br />4.0 MONITORING WELL COMPLETION <br />Well completion diagrams for each of the wells are provided in Appendix B. The four ground <br />water monitoring wells were completed with 2 inch diameter, 0.020-inch slotted, schedule 40 PVC <br />screen, with threaded end caps at the base, and 2 inch diameter schedule 40 PVC casing. The <br />PVC casing extends above the screen 1.5 to 1.84 feet above the ground surface, and are covered <br />with PVC slip caps. O-rings were placed in the threaded joints between the end caps, screens, <br />and casings. Surrounding the screens is 10-20 Colorado Silica Sand, which extends 1.5 to 2 feet <br />above the screened interval in each well. A 2 foot thick bentonite pellet seal was placed on top <br />of the silica sand, followed by neat cement which extends to the ground surface. The PVC <br />"stickups" are protected with 4 inch square steel casings complete with locking hinged lids. The <br />well locations were approximately located by the field geologist on a topographic map, they have <br />not been surveyed. <br />5.0 CONCLUSION AND RECOMMENDATIONS <br />Monitoring well installation ended on Tuesday, June 5, 1990. Refuse and debris were removed <br />• after the completion of each well. Soil cuttings generated during drilling activities were <br />stockpiled near each well. The wells were properly labeled and all equipment was mobilized <br />from the site. <br />The Hnu readings and organic odors observed in DFMW-1 could be due to natural petroleum. <br />WT recommends the ground water in that well be analyzed for Total Petroleum Hydrocarbons. <br />This analysis will allow identification oC natural petroleum, if present. <br /> Project N~bc T69-97-0fS <br /> 7u4 11, 19D0 <br />• Pew <br />