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r <br />APPENDIX A <br />SLUG TESTS <br />Introduction <br />Slug tests were performed in two monitor wells in and near the B seam to <br />determine permeability. Well SOM 127 N was tested on October 6 and 7, 1968. <br />Well SOM 127 H is completed mainly within the coal of the B seam with a open <br />interval 36.2 feet in length. Well C 72 H was tested on October 11, 1988. It <br />is completed !n sandstone immediately above the B seam with an open interval of <br />23.2 feet. Well locations are shown in Figure A-1. Lithologic and geophysical <br />logs are included in Attachments 1-4. <br />Test Methods <br />Tests were performed by lowering a 10.3 foot long, 2 inch diameter <br />Schedule 40 PVC slug on steel cable and displacing the water in the bore hole. <br />Static levels were measured in the wells prior to initiating the test with a <br />• flat cable electric well sounder manufactured by Solinst of Burlington, <br />Ontario, Canada. Depth to water and time since slug displacement were recorded <br />on field forms and entered into a computer program on a portable computer in <br />the field to analyze the data. Overnight recording was accomplished with a <br />Hermit automated data logger manufactured by In-Situ, Inc. of Laramie, Wyoming. <br />Slug Test Data and Method of Analysis <br />The data obtained is shown in Tables A-1 and A-2. Plots of the data <br />suitable for analysis by the methods of Hvorslev (1951) and Cooper, et al <br />(1967) are shown in Figures A-2 - A-6. The results of the analyses are <br />summarized in Table A-3. Both wells tested displayed low permeability. The <br />coal seam tested at SOM 127 H had a permeability of about 4 x 10-6 cm/sec, and <br />the sandstone at C 72 H had a measured permeability of about 2 x 10-6 cm/sec. <br />A-1 <br />