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After installation of the porous cup, the sampling vial was prepazed. The 35 milliliter (ml) <br />sampling vial was thoroughly decontaminated as per approved San Luis Sampling Protocol <br />equipment washing procedures. The air in the sampling vial must be at a lower pressure than <br />the water at the installed cup if fluid is to enter the vial. To accomplish this, the sampling vial <br />is evacuated or placed under a vacuum with the use of a syringe and needle donnection. The <br />vial is then placed into a protective sleeve and connected to the exit port of the vial cup fitting. <br />The sleeve is then lowered down the one-inch pipe casing and seated on the iintake port of the <br />vial cup fitting. <br />Once a sample is retrieved, the sleeve and sampling vial are pulled from th@ casing and the <br />collected sample poured into a preserved, laboratory-supplied sample bottld• The surface <br />collection sample bottles were iced during the day while the sample was collected, and placed <br />in a refrigerator in the on-site laboratory each evening during the night. Upoh completion of <br />sample retrieval, the sampling vial was re-evacuated, fitted, lowered down tha casing, and re- <br />sealed. The entrained water sample was collected at an approximate rate of 10 ml per hour. <br />The sampling location was marked as hole number 5.5. Sampling results dre discussed in <br />Section 3.3. <br />2,3 Geochemical Test Prog-dt_m <br />2.3.1 SamRle Selection <br />Once the angering program described in Section 2.2 was complete and the holes had been <br />logged, samples were selected for geochemical testing. Sample logs were evhcuated for any <br />indication of a material change which could result in a change in the sample geoQhemistry. The <br />key indicators were changes in grain size, changes in color, and any unusual cr}lstal formation. <br />In addition, samples were selected from varying depths to account for geochemi~al changes due <br />to detoxification chemicals utilized during interim detoxification. The sampli:s selected for <br />geochemical testing are shown on Table 2.1. Twelve samples were selected from the upper <br />impoundment and fifteen samples were selected from the lower impoundment. <br />io <br />