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November 8, 2007 <br />Carma <br />188 Inverness Drive West, Suite 150 <br />Englewood, Colorado 80112 <br />Attn: Mr. Brad Davis <br />Irerracon <br />NOV - 8 2007 Consulting Engineers & Scientists <br />301 North Howes <br />Fort Collins, Colorado 80521 <br />Phone 970.484.0359 <br />Fax 970.484.0454 <br />www.terracon.com <br />Re: Riprap Compliance Summary <br />Bayshore Filing No. 1 - <br />Southeast Corner of WCR 9-1/2 and WCR 28 <br />Weld County, CO <br />Terracon Project No. 22061129 <br />RECEIVED <br />NOV 2 0 2001 <br />Division of Reclamation, <br />Mining and Safety <br />At your request, we have reviewed the field observation reports for the riprap material <br />placement along the St. Vrain River at the southern boundary of the project. Our services <br />included observation of riprap placement and geotextile filter fabric placement for general <br />compliance with the project specifications outlined in the Geotechnical Engineering Report(s) <br />submitted by Terracon (Project No. 20045300; dated June 2, 2006 along with a clarification <br />letter dated June 26, 2006). Terracon performed observations on an as-requested basis during <br />the construction activities performed by Scott Contracting. <br />As recommended in the geotechnical engineering report, the riprap appeared to be uniformly <br />placed on the embankment and was placed upon a non-woven geotextile separator fabric <br />specified for the project. The existing slope (where required) appeared to have been re-graded <br />to the specified slope inclination of approximately 2-1/2 to 1 (H to V). A final walk through was <br />performed at the site on October 2, 2007 with representatives from Terracon, Carroll and <br />Lange, Carma, and Scott Contracting present. It was determined that the riprap was placed in <br />general accordance with the specifications outlined in the referenced geotechnical report <br />prepared by Terracon. <br />This letter is prepared for the exclusive use and reliance of our client. Use or reliance by any <br />other party is prohibited without the written authorization of our client and Terracon. Reliance <br />on this letter by the client and all authorized parties will be subject to the terms, conditions and <br />limitations stated in the proposal, report and Terracon's Terms and Conditions. The limitation <br />of liability defined in the Terms and Conditions is the aggregate limit of Terracon's liability to the <br />client and all relying parties. <br />Delivering Success for Clients and Employees Since 1965 <br />More Than 80 Offices Nationwide