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DEPARTMENT OF THE ARMY CORPS OF ENGINEERS,OMAHA DISTRICT DENVER REGULATORY OFFICE,9307 S.WADSWORTH BOULEVARD LITTLETON,COLORADO 80128.6961 October 9, 2002 Mr. Mike Refer Aggregate Industries 3605 S. Teller Street Lakewood, Colorado 80235 RE: Permit Number 199980194, Amendment Number 1 NeW Thornton Gravel Mine Dear Mr. Refer: This letter is in response to your request for an amendment to Department of the Army (DA) permit 199980194 issued to Aggregate Industries, Inc. for the New Thornton Gravel Mine. The permit authorized the impact of 24.1 acres of wetlands in Sections 9, 16, and 17, Township 2 South,Range 67 West, Adams County, Colorado. Before processing the amendment, this office requested you review the jurisdictional determination done for the original permit to verify that all wetlands were connected, and therefore,jurisdictional to the DA. You found that one wetland, 0.21 acre in size, in Area 1 was isolated. Since you are mitigating impacts on a 1.5:1 ratio that means that the amount of mitigation compensation for the site shall be reduced by 0.32 acre for a revised mitigation total of 35.83 acres of mitigation. As a result of this finding, Special Conditions A and E of the original permit are replaced among the additional Special Condition outlined below: K. The permittee agrees to create 35.83 acres of wetlands to mitigate for those wetlands directly impacted as a result of the mining activity. In addition to this mitigation, the permittee agrees that when the seep/stream north of 104" is relocated it will be constructed as a relatively unconfined channel with a wide area for plant growth on each side of the stream emulating a riparian corridor and will be longer and higher quality than the existing feature. Typical sections of the existing channel and the proposed channel mill accompany the detailed mitigation plan referred to in Special Condition Q below. L. The permittee agrees to submit semi-annual reports(these and all other reports shall be submitted to the Denver Regulatory Office, 9307 South Wadsworth Boulevard, Littleton, Colorado, 80128, and shall reference the permit application number) by the first of January beginning in 2003 for every year the permit is in effect, indicating the status of the work and shall include the following information: a. Date permitted activity was begun; if work has not begun on-site, please so indicate. b. Brief description and extent of work(project or mitigation activity) completed since the previous report or since permit was issued. Indicate on copies of the permit drawings those areas where work has been completed. c. Brief description and extent of work anticipated in the next six months. Indicate on copies of the permit drawings those areas where it is anticipated that work will be done.