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' RGI k OS548198 <br />Holnam, Inc. <br />' January 27,1999 <br />Page 9 <br />3.7 Ground Water Sampling <br />' Sampling of each of the new monitoring wells was performed by RGI personnel on September 11, 1998. <br />Samples were collected using an av-displacement sampling pump. Due to the low hydraulic conductivity <br />' of the aquifer and slow recovery of the wells it was not possible to purge three (3) casing volumes. <br />Ground water samples collected for metals analyses were filtered in the field using 0.45-micron in-line <br />' filters and placed in acidized sample bottles. Immediately after sampling, the sample bottles were placed <br />in a cooler with blue ice. The samples were then shipped overnight to the laboratory under proper chain- <br />, of-custody. <br />3.8 Laboratory Analysis <br />' Analyses of the ground water and CKD/sludge samples were performed by Technology Laboratory, Inc. <br />of Fort Collins, Colorado. Core Laboratories of Denver, Colorado analyzed the ground water samples <br />for radioactivity (i.e., Gross AlphaBeta). <br />1 3.8.1 CKD/Sludge Samples <br />' CKD/sludge samples were analyzed for the following parameters using a modiSed Toxicity Chazacteristic <br />' Leaching Procedure (TCLP) and the Synthetic Precipitation Leaching Procedure (SPLP). The TCLP <br />testing was performed using ground water from Monitoring Well MW-6 as the leaching fluid, which had <br />' a pH of 7.01. The SPLP testing was performed with an extraction fluid which simulated rain water west <br />of the Mississippi River and had a pH of 5.1. The EPA methodology used for the leach tests are <br />' summarized in Table 2 <br /> <br />1 <br /> <br />