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Well SOA1 23 H-3 <br />• Procedure: <br />Falling head and recovery slug tests were performed using a 5.5 feet long <br />by 2.36 inch diameter slug on September 4 and S, 1982. The falling head test <br />was monitored for 181 minutes and the slug was left overnight in the well to <br />allow the water level to equilibrate. The slug was removed the following day <br />and recovery measurements taken for 60 minutes. <br />Interpretation: <br />Data sets from the falling head and recovery tests plot on nearly identi- <br />cal lines after the first five minutes of testing. In the recovery test data, <br />anomolous data was obtained early in the test. This was probably due to dif- <br />ficulty in measuring water levels as the slug was suspended above the water. <br />Because of these anomolies, and that the falling head data continue for a longer <br />time, the falling head data set alone is interpreted in this report. The en- <br />tire trace of data points cannot be matched to the Cooper et. al. type curve. <br />• There are two intervals of data which can be matched to different portions of <br />the type curve. Early test data between 1 and 5 minutes gives a transmissivity <br />value of T=40 gpd/ft. Late data between 60 and 181 minutes is fit to the type <br />curve yielding a T=15.6 gpd/ft. This range in calculated transmissivities is <br />not great, however the T=15.6 gpd/ft. value obtained from the late test data is <br />interpreted to be most representative of the aquifer. An explanation for the <br />difference between early and late data is that a fracture zone of limited extent <br />near the well influenced the early data, but this zone does not extend far enough <br />from the well or is not sufficiently interconnected with other fractures to in- <br />.. fluence the later test data. Such a condition could possibly have been created <br />by increased or opened fractures arotmd the well bore caused by drilling distur- <br />bance. A straight line solution (Ferris $ Knowles) from the late test data yields <br />a compatible value of T=9.5 gpd/ft. <br />Well SOM 23 H-3 is completed as an open hole in the 5.0 feet thick "F" coal <br />seam to a total depth of 232 feet. Dividing T=15.6 gpd/ft. by 5.0 feet gives "F" <br />• seam permeability, K=3.12 gpd/ft2. <br />as ESA Geotechnical Consultants <br />