Laserfiche WebLink
• ~ 1 <br />Larry Henderson <br />Page 2 <br />July 24, 1996 <br />produced 3.2, 1.2, 2.9 and 2.6 casing volumes. Casing volumes of 0.7 and 1.6 were <br />produced from wells GP1 and GP2, respectively. Field pazameters for these two wells <br />were stable prior to sampling of these wells. Well GP5 was pumped for 1.6 casing <br />volumes while wells GPS and GP9 were pumped for 1.6 and 0.9 casing volumes. Jl <br />was pumped for 8.3 casing volumes prior to sampling of this alluvial well. The <br />GLUX-1 and GMP-1 wells were pumped for 0.9 and 1.4 casing volumes prior to <br />taking their samples. Field parameters were observed to be stable in these wells prior <br />to taking samples in the third quarter of 1995. <br />Bail samples have been collected for the other quarterly samples at the Trapper <br />Mine. A bail sample from the perforated interval of the well should be a fresh <br />ground-water sample and, therefore, representative of the ground-water conditions. <br />A large volume of water cannot realistically be produced for the bail samples. For <br />these deep wells, an alternative to sampling the wells on a quarterly basis would be <br />taking pump samples on asemi-annual basis.. Semi-annual pumping would produce <br />more water from each of these wells each yeaz and, therefore, maintain the ground <br />water in the well casing to be fresher. No consistent differences in the water quality <br />analyses have been observed between the bailed and pumped samples. Therefore, it <br />is our opinion that the bailed samples are representative of the ground-water <br />conditions at the Trapper site. <br />Please give me a call if you have questions relative to the procedures used in <br />ground-water sampling at the Trapper site. <br />Sincerely, <br />orge L. H fm <br />Hydrologist <br />GLH/lju <br />