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HydroGeo, Inc. <br />Surface & Groundwater Hydrology <br />Technical Memo <br />To: Henry Barbe, Mountain Coal Company <br />From: Jce Frank, HydroGeo, Inc. <br />CC: George Vandersluis, HydroGeo, Inc. <br />Date: February 23, 2005 <br />Re: Vandalism -Deep Creek Monitoring Stations. <br />1.0 Introduction <br />HydroGeo, Ina (HydroGeo) field technicians downloaded the Deep Creek data loggers on May <br />24, 2004 and November 11, 2004 for WY 2004. The Deep Creek monitoring stations were <br />revisited on May 30, 2004 as part of the peak flow survey and were in good working condition. <br />On September 6, 2004, vandalism was noted (see photo below). On November 1 I, 2004 data <br />loading at Upper Deep Creek was attempted, but was not possible because the battery voltage was <br />too low. It is not known why the battery was depleted, as normal lithium battery life is warranted <br />for more than one year and no battery related depletion problems have been encountered at any <br />other stations. The batteries in the Deep Creek data loggers were changed October 9, 2003. The <br />battery in the Lower Deep Creek data logger was replaced on October 27, 2004. In order to <br />retrieve and download the data from the Upper Deep Creek data logger, a replacement battery <br />was installed on November 1 1, 2004 and downloading was completed. <br />During office compilation of the field information for the 2004 AHR it was noted that there were <br />no water level data recorded at the Upper Deep Creek monitoring stations from June 1 I, 2004 to <br />November 11, 2004. The following information was gathered in an attempt to explain this data <br />gap. <br />2.0 Field Observations <br />HydroGeo's field engineer visited the Deep Creek monitoring stations on April 28, 2004, May <br />30, 2004 and September 6, 2004 during routine monitoring. The Deep Creek monitoring sites <br />were in good working condition on April 28 and May 30, 2004. On September 6, 2004, the field <br />engineer reported that the lids were off of both the Upper and Lower Deep Creek monitoring <br />recorder boxes and that the data logger was out of the recorder box and it was laying on the lid at <br />Upper Deep Creek. At that time, it was assumed a bear had probably knocked the lids off. A <br />photo was taken of the Upper Deep Creek monitoring station on September 6, 2004 (attached). <br />