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MMRR quarry, M-2004-067 Response to Sept. 7 Adequacy Review September 12, 2005 Page 2 8. The Division requests that the Applicant commit to evaluating the need for a filter fabric or liner beneath any riprap installation, and install such filter fabric if needed. Please respond. The Applicant will evaluate the need for filter fabric or a liner beneath riprap in surface drainage channels at the MMRR Quarry. Filter fabric or liner will be installed if needed. C. The Division requests that the Applicant commit to providing an 'As-Built Certification" from a registered professional engineer for all hydraulic structures installed at the MMRR Quarry, including drainage or collection channels, sediment ponds, spillways, riprap pads, check dams, culverts, etc. The certification should be submitted within 60 days of completion of all hydraulic structures and verify that all such structures were properly installed according to the designs provided in the mining and reclamation permit. Please respond. Within 60 days of completed construction of hydraulic structures installed at the MMRR Quarry, the Applicant will supply to the Division an As-Built Certification from a registered professional engineer. The certification will verify that structures were properly installed according to designs in the mining and reclamation plans. 21. Blasting Plan -Review comments from Allen Sorenson will be forwarded to the Applicant as soon as they become available. By topic, Allen Sorenson's September 9 memo is addressed as follows: Blasting Vibration Compliance Please see the attached letter from Lyman Henn, Inc. Pre-Blast Surveys The applicant will conduct pre-blast surveys of potentially affected structures in accordance with DMG Rules, with notice and requests to survey sent to all affected structure owners at least 30 days prior to initiation of blasting. Furthermore, the survey will be completed and submitted to the DMG prior to the initiation of blasting. Conduct of the structure survey will be based on appropriate established practices, as cited in Mr. Sorenson's memo. The Office of Surface Mining, Blasting Guidance Manual (1987) shall define appropriate methods for conduct of the survey. Controls for Flyrock and Dust Please see the discussion below. The response to the Division's comments in the September 7 adequacy review letter also incorporates discussion of the relevant portions (on page 4) of Allen Sorenson's September 9 memo.