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Mr. Thames Hartley -3- July 12. 1995 The Division will further require that field trial seams be prepared and destructively tested at the beginning of each seaming period, and at least once each four hours, for each seaming apparatus used that day. Destructive samples must be randomly cut and tested during liner installation, at an average frequency of one test for each 500 feet of welded seam. Destructive testing to be in accordance with test method ASTM D 4437. Obviously, hot shoe double welding cannot be used for detail or repair work. The Division will require that conventional extrusion welding be used for all areas that cannot be hot shoe welded, including the underdrain pipe boot location. All extrusion welds will have to be tested for leaks. 9. The Division shares the Committee's concern with the potential for wind damage to the liner during installation. Please commit to having a sufficient number of sand bags on hand to provide uninterrupted coverage for any un-anchored liner edge at any point during installation. 10. The Committee's comments regarding underdrain installation are well taken and will have to be addressed by COM, Inc. In particular, a) specify the elope of the solid section oP the underdrain pipe, between the connection to the perforated section and the proposed valve box; b) specify the minimum thickness of hand compacted fill that will be placed on the solid section of underdrain pipe prior to allowing mechanized compaction to resume, and; c) commit to establishment of a minimum 2 percent grade for all perforated sections BP underdrain page. A1_sQ, the suggestion that a reservoir be installed at the underdrain pump is a good one, in that maintaining a head on the pump will prevent cavitation. COM, Inc. is under a Board Order to initiate mill site reclamation on July 28, 1995. The obvious course to take in any effort to have this Board Order reversed, would be to gain approval of the permit application, and issuance of the permit. In order for the Division to approve the application, COM, Inc. must adequately address the issues raised in this letter, as well as those issues enumerated in the Division's letters dated June 30, 1995, and June 25, 1995, and complete the on the ground work required in the Division's 2/28/95 and 6/7/95 inspection reports. The required on the ground work includes establishment of the interim storm water retention berm on the tailing dam crest, maintenance of upland diversion ditches, removal of tailing from the Hazel-A adit, repair of decant risers so that they extend above the level of the tailing surface, and repair of all liner defects and tears. Expedience in addressing these issues and completing this work is clearly called for.