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Introduction The Division received a Citizen's Request for Inspection on Thursday, May 23, 2002. This request pertained to an allegation of off-site impacts occurring as a result of surface coal mine blasting. The specific allegation was that blasting from the Lorencito Canyon coal mine located near Primero, Colorado had caused a large rock to become dislodged from a road cut adjacent to State Highway 12 and to come to rest in the middle of the highway. The request for inspection was filed by a landowner whose residence is situated approximately 600 feet uphill from where the rockfall occurred. Distances from the location of the rockfall to the various blast sites at the mine vary; blasts that occurred on May 20, 2002, and May 23, 2002 appear to have been situated from 4175 feet to 5750 feet from the rockfall area. I conducted the inspection on Friday, May 24, 2002. I interviewed severa[ individuals involved in the events that occurred around the time of the rockfall before, during, and after my inspection. I reviewed information obtained from Lorencito Coal Company (LCC) pertaining to six blasts that occurred during the seven days prior to, and on the day of, the request for inspection. I took several photographs of the area where the rockfall occurred, and, on 5/24/02, was given two photographs of the rock on the highway by the landowner requesting the inspection. I also obtained some assistance with this investigation from the US Office of Surface Mining. I have prepared this report in response to this request for inspection. The report is divided into three sections: "A. Investigation", "B. Evaluations", and "C. Conclusions". A. Investieation I received a citizen's request for inspection from Mr. Ron Leef on Thursday, 5/23/02, via a telephone voice mail message. Mr. Leef indicated in his message that he would also be contacting Kent Gorham, whom Mr. Leef knew to be the current lead DMG specialist for the Lorencito Canyon coal mine. Mr. Gorham was out of the office on 5/23/02, so I returned Mr. Leefls call at his home (719-868-2131) during the afternoon of 5/23/02. I informed Mr. Leef that Kent was out of the office, and that as a result, I was responding to his phone call. Mr. Leef informed me that a lazge rock had fallen onto State Highway 12 (SH12) during the morning of 5/23/02. Mr. Leef stated that the rock had fallen from a hillside that was near his property and adjacent to SH12. Mr. Leef stated that the rockfall had occurred at a point on the highway north of the Lorencito Canyon coal mine and south of his house. Mr. Leef stated that he believed the rock had fallen at approximately 10:00 am on 5/23/02. Mr. Leef stated that the State Patrol had arrived at site ofthe rockfall around 10:30 am on 5/23/02, and had closed the highway. Mr. Leef stated that a large front-end loader from the Lorencito Canyon mine had arrived at the rockfall site, had moved the rock off the highway, and that the Colorado Department of Transportation (CDOT), who had arrived at the site after the State Patrol, had broken the rock into smaller pieces.