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• WATER QUALITY SAMPLING PROTOCOL <br />Procedure <br />The currently employed ground water sampling procedure for the Keenesburg site <br />monitor wells is described herein. First, the order of sampling of the wells is <br />determined by the historical salinity level in each of the monitor wells. Monitor wells <br />with the lowest salinity values aze sampled first to preclude possible data <br />contamination from the higher salinity wells. CEC performs the ground water <br />sampling quarterly. Analytical laboratory testing is performed by Accu-Labs <br />Reseazch, Inc.(Golden, Colorado), the contract analytical laboratory. <br />After examination of the physical condition of the local surface area surrounding the <br />well casing as well as the casing itself, for damage or unusual condition, the well cap <br />is removed and the static water level (SWL) of the ground water is measured from the <br />top of the well casing and recorded. A one (1) liter sample bailer is initially used to <br />remove five (5) bailer volumes of water. The fifth bailer volume is used to rinse the <br />individual field sample containers. A sixth bailer volume is used to fill the field <br />sample container, and a seventh (and if needed, an eighth) bailer volume is used to fill <br />the sample containers (sterilized) provided by the contract laboratory. These <br />laboratory samples are sealed, marked for identification (by the laboratory), and <br />stored with ice packs in insulated containers for transport to the laboratory as soon as <br />possible. 1n addition, field water quality samples are analyzed for temperature, pH, <br />and specific conductivity. <br />Following the bailer sampling, a submersible pump is then used to evacuate three (3) <br />well volumes in each monitor well, calculated using the SWL, total depth of the <br />completed well, and the casing volume. Once the individual well volumes have been <br />pumped, a new SWL measurement is recorded, the previously-described bailer <br />sampling procedure is repeated, and an additional water sample is obtained for <br />analytical laboratory testing and another field water sample is analyzed for <br />temperature, pH, and specific conductivity. <br />CEC is proposing, with its most recent Permit Renewal Application (3), to modify <br />this procedure by the elimination of the first set (before 3 well volumes are <br />evacuated) of laboratory samples. This proposal stems from sampling protocol, <br />conducted in the presence of representatives of the Division, where the benefit of this <br />• first set of laboratory samples was called into question. <br />AfIR-1996 -33- Stipulation ~`5 <br />