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WATER QUALITY SAMPLING <br />• Procedure <br />The currently employed sampling procedure is described herein. First, the <br />order of sampling of the wells is determined by the historical salinity level of <br />each of the wells. Wells with the lowest salinity values are sampled first to <br />protect against possible data contamination from the higher salinity wells. <br />After examination of the physical condition of the surface area around the <br />well casing, and the casing itself, for damage or unusual appearance, the cap <br />is removed and the static water level is measured from the top of the well <br />casing and recorded. A one (1) liter sample bailer is used to remove five (5) <br />bailer volumes of water. The fifth bailer volume is used to rinse the field <br />sample containers. A sixth bailer volume is used to fill the field sample <br />container, and a seventh (and if needed, an eighth) bailer volume is used to <br />fill the sterile sample containers provided by the laboratory. These lab <br />samples are sealed, marked for identification by the lab, and stored in <br />insulated containers for transport to the lab at the earliest opportunity. Field <br />• samples are then analyzed and values are recorded for temperature, pH, and <br />electrical conductivity. <br />A submersible pump is now used to evacuate three (3) well volumes, <br />calculated using the static water level, total depth of the well, and the casing <br />volume. Once the volumes have been pumped, a new static water level <br />measurement is recorded, the previously described bailer sampling procedure <br />is repeated, an additional lab sample is obtained, and a further field sample is <br />analyzed for temperature, pH and electrical conductivity. <br />Discussion <br />In its review of the 1994 AHR Report, the Division made comment <br />requesting a comparison of this procedure to that which may ah-eady be <br />provided for by the Permit. The current procedure is at variance with one <br />wluch was most recently approved as part of TR-27, 4/93 (Volume 1, Section <br />2.04.7, page 56 of the Permit [copy attached for reference] see page 34a). <br />The procedural difference (1994 and 1995 AHR Reports versus the Permit) is <br />focused on the additional steps of, "a submersible pump is used to evacuate <br />three (3) well volumes" and "the bailer sample procedure is repeated". This <br />deviation was begun on October 28, 1992, as the direct result of a OSM <br />AHR-1995 -34- STIPULATION #5 <br />