Laserfiche WebLink
4-3 <br />G-4 <br />136 <br />,G-5 <br />434 <br />G-6 <br />96 <br />G-7 <br />94 <br />G-8 <br />97 <br />G-9 <br />10 <br />1437 <br />Figure 6 graphically presents the locations and quantities of grout takes <br />within the nine borings. Most of the grout take occurred in the alluvial soil <br />layer just below the embankment fill approximately 80-90 feet below the <br />embankment crest (approximate elevation 8870-8880 feet). , Grout takes within <br />this layer approached 130 cubic feet of grout per foot of hole in both G-3 and <br />G-5. The layer of rock immediately below the alluvial soil layer took less <br />grout than the soil layer. Figure 7 illustrates the high grout take locations <br />on a cross-section of the tailings dam for boring G-5. Grout takes in the <br />rock were as much as 32 cubic feet per foot in'G-2, but average grout takes <br />for the other holes were in the range of 2-12 cubic feet per foot. The rock <br />took more grout in the weathered zone near the interface with the alluvial <br />soil than in the more intact rock. <br />The largest grout take occurred in G-5 where 650 cubic feet of grout was <br />pumped in the interval between 82-87 feet below the crest. A thorough search <br />of the area at the end of the day including upstream, toe area, and toe <br />piezometers did not show any signs of the injected grout. <br />The chemical grouting program was conducted in G-5. Over 1,800 gallons of <br />Celtite 55-03 terraset chemical grout were mixed and injected in the following <br />proportions: 35.9 percent terraset (by volume), 3.3 percent hardener and 60.8 <br />percent water. Set time was approximately 50 minutes at 60°F. The chemical <br />grout was mixed with Uranine dye and injected in the intervals of 109-115 feet <br />and 92-94 feet below the crest. The chemical grout was followed by cement <br />grout until refusal was obtained. <br />