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(Page 2) MINE ID # OR PROSPECTING ID #: rn-1gR3-n~~ INSPECTION DATE: _ nFii sim INSPECTOR=S INITIALS: X9.5_ 1. A site inspection of the Walstrum Quarry was conducted in response to a citizen complaint received on May 16, 2007 from Dale Lauer of the Upper Clear Creek Watershed Association (UCCWA). Please see attached complaint letter dated May 15, 2007 from Dale Lauer to Frederick Rollenhagen of the Clear Creek County Planning Department. The UCCWA complaint letter alleges water quality impacts of the quarry operations on Clear Creek, ie: sediment loading into the stream. Present during the inspection was Ben Frei of Albert Frei & Sons, and Steve O'Brian of Environment Inc. 2. The Walstrum Quarry is permitted for a total of 292.07 acres, with a maximum disturbance at any one time of 50 acres. The mine plan specifies conventional quarrying techniques with development of 40' high x 40' wide benches and overall slope configuration of 1:1. The post-mining land use is industrial/commercial. The operator has posted a financial warranty of $741,500. Based on the disturbances noted during the inspection, this inspector finds the existing financial warranty to be adequate to complete the reclamation plan. 3. Based on the site inspection, the Division cannot verify excessive sedimentation or adverse water quality impacts to Clear Creek resulting from the Walstrum Quarry operations. The area of concern appears to be outside of the permit boundary for the Walstrum Quarry and along the right of way for U.S. Highway 6. The quarry operator has established a tarping and truck staging area on the south (river) side of Highway 6 across the entrance to the quarry, and also uses this area to draw water from Clear Creek for dust suppression needs at the quarry. This area is delineated as Stage Y on the Exhibit C Mine Plan Map and does occur within the 292.07 acre permit area. With the exception of a small ramp area, approximately 20'x10', between the water tank and stream the operator has done a good job of drainage control and minimizing sedimentation into Clear Creek. The operator has also established a stable, well-vegetated and armored berm to isolate Clear Creek from the staging and water supply activities. Because there is evidence of minor erosion and unstable soils in the "ramp area" the Division considers this matter to be a problem that will require corrective actions and requests that the operator submit a plan in the form of a technical revision to address slope stabilization and minimize the potential for sedimentation into Clear Creek from this area. Please see Page 4 for Corrective Actions. 4. Mr. Frei indicated that Albert Frei & Sons, Inc. is willing to cooperate with the Colorado Department of Transportation (CDOT) regarding road sweeping operations for dust control near the entrance to the quarry. 5. This ihspector noted erosion and sedimentation along the right-of-way {river side) of Highway 6 both upstream and downstream of the Stage Y area. There also appeared to be a steep non-vegetated embankment and drainage from Johnson Gulch, both of which occur on the south side of Clear Creek which may contribute non-point source storm-water drainage and possible sedimentation into Clear Creek. These areas are also outside the permit area for the Walstrum quarry, Permit M-1983-033. 6. A copy of this report is being forwarded to the Colorado Department of Transportation for their review. 7. Digital photographs were taken and are attached to this report.