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• (Page 2) • <br />MINE ID # OR PROSPECTING ID # M-94-117 <br />INSPECTION DA~f'E 09 2 X98 INSPECTOR'S INITIALS CLK <br />OBSERVATIONS <br />The following observations were made during the installation of the GCL and 60 ml HDPE liners <br />in the expanded pond area at Gold Hill Mill. <br />1) Rocks continued to be removed from the subgrade throughout the day, sand covering areas <br />where rocks could not be dug out, and organic material was removed from the anchor trench. <br />2) Colorado Lining Co. laid down the GCL layer (Bentofix) per the specs, with the edges of <br />each panel overlapping by at least 6" and extending 4' up into the anchor trench above <br />the pond. The width of overlap was checked with a ruler, and it was realized that the <br />overlap lines drawn on the panels are at least 7" from the edges of the GCL's. Where <br />liner could not be laid down in one piece, sections were cut to fit the spaces required. <br />Th.e edges of the GCL were sandbagged in place until the HDPE layer was placed and <br />sandbagged. <br />3) Pz~oblems with the rock layer in the anchor trench led to several alternatives to digging <br />out the trench being proposed. Throughout the day, the trenches were being mucked out to <br />allow for a measured depth of 2' and width of 2'. <br />4) HDPE liner was also placed by Colorado Lining Co. in accordance with specifications, with <br />tk~e edges overlapping by at least 6" each panel marked with white marker (for ease of <br />seam identification later). Holes and tears found during installation were marked when <br />found so they could be sealed later. <br />5) Th.e welding machine had been checked earlier in the day by Colorado Liners to confirm that <br />ttie seals would meet strength and torque requirements. Peel tests with a "coupon" were <br />done, and the results complied with the manufacturer's specifications. <br />6) CY~ecks on the subgrade were done as preparation work was completed in each area, including <br />ckiecks for the presence of rocks, rips, and over-steep grades. <br />7) Ai.r-pressure tests on the welds were not done at this time, Upon completion of the days <br />work (ended at 4:40pm due to rain), the liner was sandbagged in place to prevent it from <br />slipping. <br />I & f? Contact Address <br />NAME Maxine Stewart <br />OPERATOR ITEC Environmental <br />STREEiT 707 17`" Street, Suite 310 <br />CITY/STATE/ZIP Denver, Co 80202 <br />cc: Carl B. Mount, DMG <br />^ CE <br />^ BL <br />^ FS <br />^ ~',' <br />^ HMWMD (CH) <br />^ SE <br />^ WQCD (CH) <br />^ Other <br />Ted Gengler, ITEC (see above) <br />Will Hamling, ITEC (see above) <br />Mark Steen <br />P.O. Box 1523 <br />Longmont, CO 80502 <br />