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' (P~3e 2) MINE ID # OR PROSPECTING ID # M-99-034 INSPECTION DATE 12/04/00 INSPECTOR'S INITIALS ESC This was an inspection of the Cooley Reservoir & Fulton Wildlife Area conducted by Erica Crosby of the Division of Minerals & Geology. Jamie Gaboriau and Tom Maul of CAMAS Colorado, Inc. were present during the inspection. In addition, John Woodside and Joe Woodrick were present on behalf of Dorothy Ford who was unable to attend the inspection. The inspection was a result of a citizen complaint letter submitted by Dorothy Ford and received by the Division on November 13, 2000. The letter states that activities at the mine resulted in the collapse of her well. Specifically, the temporary lowering and the permanent raising of the shallow water level caused the well to cave in. The letter states that the depth of the well is 400 feet and was cased down to 35 feet. The collapse of the well was concurrent with the construction of the slurry wall on the southeast corner of 104`" Ave. and McKay Road. The Division inspected the location of the well on Dorothy Ford's property. The well is encased in a large concrete structure below ground (appx. 36" diameter). According to Joe Woodrick, who was present during the incident, the collapse of the well occurred during construction of the slurry wall. Mr. Woodrick believes that the vibration from the equipment caused the well to collapse in the shale layer at a depth of approximately 60 feet. Prior to the collapse, Mr. Woodrick stated that the well was producing at a rate of 5-6 gallons per minute. The Division reviewed the information in the permit application titled, Colorado Wells, Aoolications and Permits supplied by the Colorado Division of Water Resources. The Division noted two permit numbers under the listing of Ford; 27319F and 27320F in the NENW Sec 17, T2S, R67W. John Woodside sent a copy of the two well permits on December 5, 2000 noting the prescribed use as irrigation. It was stated during the inspection that the well is used for domestic water. It remains unclear to the Division if the permits sent to the Division are for the well in question. It appears that at least two wells on the property are permitted by the Colorado Division of Water Resources. Since it was stated during that two wells are located on the Ford property, the Division will presume that one of the well permits cover the well in question. If this is not the case, the operator will need to submit documentation to the Division stating otherwise. During the inspection, the operator supplied the Division with monitoring data from wells sampled monthly. From February 2000 to September 2000 the depth to groundwater ranged from 10 feet to 12.5 feet below the ground surface. During the months of October and November, groundwater depth was recorded at 8 feet below the ground surface. This indicates a rise of approximately 2 feet of the groundwater elevation. This is consistent with the predictions noted in the permit application. The Division does not believe that the variation in the alluvial groundwater level a to 12 feet below the surface caused the well to collapse at a depth of 60 feet. As stated above, Mr. Woodrick believes that the vibration from the equipment used to construct the slurry wall may have caused the well to collapse. The distance from the well to the slurry wall is approximately 250 feet. Since the Division was not present on site during the construction of the slurry wall, it is impossible to determine if the activity caused the well to collapse. Therefore, the operator has the following options; 1. Provide the Division a description of the site activity during construction of the slurry wall and describe how the activities have or have not resulted in hydrologic impacts to Dorothy Ford's well. In addition, please provide the status of the Office of the State Engineer letter to the Division dated May 17, 1999 regarding wells within