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Page 7 <br />TETRA TECH RMC Mr. Berhan Keffelew <br />July 27, 2004 <br />2. At the time of this review, the Urban Drainage and Flood Control District <br />(District) has not offrcially committed to a cooperative project to stabilize the <br />adjoining riverbank as per the Guideline requirements. We have initiated <br />cooperative project discussions with the applicant due to their desire to mine <br />within 400 feet of the riverbank. However, we cannot guarantee a riverbank <br />project until the applicant deeds a flowage and maintenance access easement <br />and our Board of Directors authorizes funds to assist with the bank <br />stabilization. Therefore, since no riverbank project has been authorized as of <br />this review request, we request the note "MINING LIMIT WITHOUT FURTHER <br />APPROVAL OF UDFCD AND DMG" be moved to a 400 feet setback from the <br />riverbank on the Mining Plan. <br />We have revised the Mining Plan Map to allow for the 400 foot setback along <br />the eastern property line as requested by UDFCD. The maximum mining limit <br />to the east remains unchanged. <br />3. It is our understanding that the resultant perimeter berm will be at or below pre- <br />mining elevations at all locations. This cannot be verified since contours are <br />not shown along the top of the proposed reservoir; however, any deviation from <br />this understanding will be considered a violation of the applicable floodplain <br />regulations until a new floodplain use permit is applied for and obtained. <br />The top of the reclaimed reservoir (limit of mining) will be at existing pre- <br />mining elevations. The applicant will not fill above existing (pre-mining) grade <br />without additional approval from UDFCD. <br />4. Note 1 on the mining plan states that the applicant will install SO native <br />cottonwood trees to enhance the river corridor. Due to strong beaver activity <br />observed in this area we recommend these trees be protected with wire cages as <br />shown in the District's Urban Storm Drainage Criteria Manual. On-going tree <br />maintenance, including watering as needed, should be provided by the <br />applicant. Any trees found dead within the fast year or two should be the <br />responsibility of the applicant to replace. <br />The applicant agrees. Note 1 on the Reclamation Plan Map has been revised to <br />include installation of protective cages on the trees. <br />In addition, we have a couple of points we'd like to bring to your attention regarding the <br />Inspection Report that you prepared for this application. The Office of the State <br />Engineer (SEO) does not review slurry wall design. They will inspect the lined reservoir <br />upon completion of the mining. Preliminary specifications, including quality assurance <br />and quality control standards, for the slurry wall are attached for your review and the <br />