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f4e11 SOM 2-H <br />• <br />'::.• <br />Procedure: <br />Slug testing on well SOM 2-H commenced at 10:03 am on September 9, 1982. <br />Response of the well to inserting the 5.5 feet by 2.36 inch slug was very slow. <br />The slug was left in the well overnight to obtain water level measurements at <br />large time values to define the type curve. Since it rained the following day <br />(Sept. 10), the site was inaccessable until late in the afternoon at which time <br />(4:00 pm) a water level measurement was obtained. The test was continued through <br />a second night, with rain the following morning, and a final reading obtain- <br />ed at 12:17 pm after an elapsed time of 3015 minutes. This was the longest slug <br />test conducted during the study. Initially 1.88 feet of water was displaced in <br />the well (assumed Ho = 1.88 ft.). After 3015 minutes, this water level had <br />dropped only 0.205 feet, or 10.90 of Ho. No recovery slug test was attempted. <br />Interpretation: <br />Only a small part of the type curve can be fit to the test data due to the <br />extremely slow response of the well. The fit of this data, however is good. <br />From the type curve method (Cooper et. al., 1967) we obtain a T=0.028 gpd/ft. <br />Using the line-source method (Ferris 5 Knowles, 1954) the data points do not <br />form a straight line approaching the origin of the graph, however using only <br />the final data point the same T=0.028 gpd/ft. value is obtained. <br />The well completion report indicates that this well is cased with 4-inch <br />steel casing and cemented to a depth of approximately 700 feet. It is complet- <br />ed as an open hole at the bottom of the well through about 5.5 feet of "F" seam <br />.... coal. Using T=0.028 gpd/ft. divided by S.5 feet, K is calculated to be 0.0051 <br />2 <br />gpd/ft It is possible that this very low permeability represents the actual <br />characteristics of the coal, particularly if the coal is unfractured or argil- <br />laceous at this location. <br />_.• <br />19 ESA Geotechnical Consultants <br />