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<br />~, <br />(Page 2) <br />NINE ID f OR PROSPECTING ID / K-80-244 <br />INSPECTION DATE 10-20-94 <br />INSPECTOR'S INITIALS ACS <br />An inspection was conducted of the phase one leach pad construction. This particular <br />inspection focussed on the installation of two vibrating wire piezometere on top of the <br />composite liner some distance above the lower anchor trench. <br />The piezometere being installed are denoted ae P4 and PS on the drawings, and are located in <br />ewalee where the 15" perforated CPE solution collection/transport pipes have been placed. <br />The piezometere are being installed by Colorado Engineering and Instrumentation, Inc. (CEII). <br />Tom Fanning of CEiI is the installation project manager, and was on site to describe and <br />demonstrate the equipment to ue. It was demonstrated that the instruments are sensitive <br />enough to detect a barometric pressure change over only a few foot change in elevation. <br />The installation ie achieved by extrusion welding a rectangular protective patch to the VLDPE <br />portion of the composite liner, then welding VLDPE straps onto the patch to hold down a <br />section of plastic pipe that has numerous holes drilled into it and ie open at either end. <br />The piezometere are placed into the pipe, and cable ie run adjacent to the 15" CPE pipe to <br />eventually provide an instrument read-out lead. At the time of this inspection, the <br />installers had placed piezometer PS into the protective length of pipe and were backfilling <br />it with drain cover fill; the installation was .then covered, once again with general drain <br />cover fill. I suggested that select drain cover fill would better suit the intended purpose. <br />Since the time of this inspection, it has been determined that drainage sand will be used to <br />surround the instruments. Well graded silica sand would be ideal. It has further been <br />determined that the piezometere will be field calibrated by CEII. The operator is reminded <br />that piezometer installation ie one of the stipulated inspection milestones. <br />cc: Berhan Keffelew <br />Carl Mount <br />I 6 E Contact Address <br /> ~ CE <br />NAME John Hardaway ~ BL <br />OPERATOR Cripple Creek 6 Victor Gold Co. ~ FS <br />STREET P.O. Box 191 ~ HW <br />CZTY/STATE/ZIP Victor, CO 80860 ~ HMWMD (CH) <br /> ~ SE <br /> ~ WQCD (CH) <br /> ~ OTHER <br />