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Subsidence Field Observations <br />West Elk Mine <br />July 22-24, 2003 <br />3.0 OVERVIEW OF FIELD SUBSIDENCE STUDIES DURING JULY 22-24, 2003 <br />1. The author used his personal 4-wheel drive vehicle during this fieldwork. A reliable <br />all-terrain vehicle (ATV) was not available. The 4-wheel drive Toyota pickup worked <br />efficiently; however, it was necessary to make three foot traverses in areas where the <br />author's vehicle could not travel. <br />2. Prior field knowledge and experience during past field studies indicated that coal mine <br />subsidence features (e.g., cracks and bulges) could most likely be observed on roads, <br />trails, and azeas cleaz of brush. These azeas were therefore selected in order to obtain <br />maximum subsidence information most efficiently. <br />831-032.610 Wright Water Engineers, Inc. Page 6 <br />September 2003 <br />