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(Page 2) MINE ID # OR PROSPECTING ID #: M-1992-nF9 INSPECTION DATE: n9/2n/nt INSPECTOR'S INITIALS: SAP OBSERVATIONS This inspection was conducted in response to a report from Colorado Department of Public Health and Environment (CDPHE) that a diesel oil leak had occurred on the site sometime between mid-March and the end of April of 2001. The operator has been working with CDPHE since the time of discovery of the leak in order [o comply with state regulations concerning remediation. Present at the inspection were Kate Pickford, DMG, Carl B. Mount, DMG, and Connie Davis, Aggregate Industries WCR, Inc. Weather at the time of inspection was clear, calm, and about 80 degrees. In May, 2001, approximately 2,000 cubic yards of contaminated soil was excavated from the affected area and stockpiled on the site. Ms. Davis indicated that the boundaries of the abatement excavation were set according to recommendations by the consulting firm hired to oversee the abatement, The Paragon Group. According to Ms. Davis, the contaminated soil stockpile was placed on some type of liner material. Ms. Davis did not know what type of liner was used. The contaminated soil is being incorporated into asphalt produced at the site. According to Ms. Davis, CDPHE approved this use of the contaminated soil. At the time of inspection, there was no sign of stained soil in the area that had been excavated. 3. The abatement excavation was subsequently filled with fill material. Ms. Davis was unsure of the exact location from which the fill material was obtained, but thought it was acquired from somewhere west of the excavation pit. It is anticipated that during subsequent extraction activities, any remaining contaminated soil will be excavated. Any contaminated soil that is subsequently excavated from the pit will be stockpiled and handled as was the material that was excavated during abatement activities. 4. Prior to July 6, 2001, groundwater and free-phase product were pumped from the abatement excavation site and shipped to Key Energy Services for treatment and disposal. Additional groundwater was pumped from the excavation site and was stored onsite for use at the site. 5. Two groundwater samples were collected during the abatement process to test for contamination of groundwater. Five monitoring wells were installed on July 9 and July 10, 2001. The wells have been sampled once since their installation and will be sampled quarterly for a total of one year. Ms. Davis indicated that at no time was there visible evidence that contaminants had migrated to the dewatering trench, and believes that this is still being monitored regularly, although there are no formal monitoring parameters set for the dewatering trench. There is a large stockpile of asphalt to be recycled which is located to the south of the monitoring wells. Ms. Davis was not aware of any groundwater wells near the permit area which are used for drinking water. 6. At the time of the diesel fuel leak, the only inventory of the fuel in the AST was an endof-month measurement of the fuel remaining in the tank in the form of a stick dipped into the tank. This procedure was also conducted when fuel was ordered to fill the tank. Ms. Davis indicated that further monitoring has been incorporated in the form of a memo initiated by her in August, 2001 including a form to be used to document fuel usage at the pump. At the time of inspection, Ms. Davis was uncertain as to whether these forms were actually being used as requested by her. 7. During the inspection it was noted that the topsoil stockpiles are weed-covered and should be seeded. Ms. Davis indicated that mining in the area should be completed and the topsoil spread and graded within one or two years. 8. This inspection indicates that Aggregate industries is making a genuine effort to rectify any contamination that occurred as a result of the fuel leak. The company is working under the guidance of a consulting group. Ms. Davis was advised, for future reference, that incidents such as this fuel leak must be reported to not only CDPHE, but also to the Division. A report under separate cover will be sent to the operator indicating further action required by the Division.