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Bulldog Mine TailinRS Pondr Eva(uatiart <br />between the top of the sample and the top end of the tube was filled with a plastic bag to mark <br />• the top of sample and packed with tailings to provide a moderate confining pressure and reduce <br />sample swelling and density changes during transportation. The ends of the tubes were then <br />capped with plastic end caps and sealed with tape to inhibit moisture loss. <br />Bagged samples were stored out of direct sunlight in a cooler afrer sampling. The Shelby tube <br />and acrylic tube samples were stored in an upright orientation out of direct sunlight afrer <br />sampling and efforts were made to reduce disturbance during handling and transportation. All <br />samples were stored out of direct sunlight in order to reduce moisture losses prior to testing. <br />Based on site observations, tailings in the Lower Pond were of higher density than tailings in the <br />Upper Pond. As a result, the quantities of tailings slurry and pore water in the test holes upon <br />completion of drilling were too small to sample. Therefore, pore water samples were not <br />obtained from the Lower Pond tailings. <br />Tailings pore water samples were collected from the two test holes drilled in the Upper Pond. <br />Upon completion of test hole UP-1 to a final depth of 41.5 feet, the hollow stem auger was <br />pulled five feet up from the bottom of the hole. The hole was then left open for approximately <br />fifteen minutes and a sample of the slurry of tailings and pore water that had pooled in the <br />bottom of the hole collected. Test hole UP-2 was completed [o a final depth of 36.5 feet and the <br />auger pulled five feet up from the bottom of the hole. After fifteen minutes there was not enough <br />slurry pooled in the bottom of the hole for collection of a sample, so the auger was pulled up an <br />additional five feet. The hole was left open for an additional twenty minutes and a slurry sample <br />was collected. Both slurry samples were allowed to settle overnight before decanting the cleaz <br />pore water from the samples for chemical analysis. <br />3.2 Supplemental Investigations <br />Oxygen profile and flux measurements were made in tailings at both the Upper and Lower <br />Ponds. Oxygen profile measurements were performed to identify if oxygen is being consumed <br />by sulfide oxidation reactions within the tailings. Profile measurements were made using the <br />• method developed by Blowes and Jambor (1990). Small diameter stainless steel tubes were <br />driven into the tailings at depths determined by hand augering holes adjacent to the probe <br />Nomesrake Slmmg Compare' Shepherd lldfer. (nc. <br />n~v--unm,ud,,~•.yr 8 ,,.Ipri( N. 1997 <br />