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i • <br />DAILY REPORT <br />PROJECT NAME: SAN LUIS MINE PROJECT NUMBER: 92401.00 <br />REPORT DATE: 4/17/97 <br />T0: DAVE HALLMAN, SRK PROJECT ENGINEER <br />FROM: GLENN GUYER, SRK SENIOR FIELD TECHNICIAN <br />SUBJECT: LINER REPAIR <br />I arrived at the site at 0800 hrs. I continued to mark repairs. <br />At 0920 hrs. the weather and liner conditions were, an ambient <br />temperature of 49 degrees F., a liner Temperature of 66 degrees <br />F., light breeze and no clouds. The pre weld tests were run with <br />the machine temperature at 350 degrees F. with a tip temp. of 385 <br />degrees F. VLDPE rod was used from roll number 13/B5656 dated <br />5/10/93. The manufacturer was National Seal and the serial <br />numbers on the real was VROD5656-3E1000138. The weld wa:: done on <br />VLDPE and HDPE liner separately with the same results. The <br />welding rod had at some time in the passed been exposed to <br />moisture which had been absorbed and caused the rod to L.nusable. <br />I called Mr. Dillie, Colorado State, and gave him a project <br />update. I also asked if an anchor trench approximately three and <br />one-half feet vertically above the tailings would be sufficient <br />for the liner repair area. He stated that he felt that it would <br />be O.K. <br />I called the manufacturer for certification of [he Low Linear rod <br />and received it via FAX. I discussed the properties of the LLDPE <br />rod with the SRK office in Lakewood and they felt that it was <br />compatible with both HDPE and VLDPE liners. The manufacturer <br />of the welding rod was National Seal. The numbers on the real <br />were LROD909N-5I0800028. The supplier of the rod was located at <br />HWY. 41 Sth, Galesburg I11. 61401. The pre-welds were run showing <br />a normal visual weld. The peal results were 63, 63, 59, 61 and 60 <br />PPI. The sheer tests were 64, 69, 69, 66 and 70, all FTB <br />(passing?. After re-cleaning and grinding all patches and seams <br />to be welded, the welding was completed in under two hours <br />followed by vacuum testing all welds and re-welding and re-vacuum <br />testing any leaks found. The welding was done at an ambient <br />temperature of 71 degrees F with the liner temperature at 98 <br />degrees F. i inspected the liner and accepted the 44' by 125' <br />area at 1449 hrs. The earth moving contractor was notified and <br />liner cover material was placed until the end of the shift at <br />1700 hrs. <br />GLENN ER, K F~ ld Representative <br />DALY417.WP6 <br />