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LJ <br /> QRION <br /> 2.2.4 Groundwater Sampling Procedures <br /> L <br /> The wells will be sampled 1 day after installation and development and again <br /> approximately three months after installation. The depth to groundwater and total well <br /> depth will be .measured before sampling using an ' electric water well sounder. <br /> Approximately 3 to 5 casing volumes will be purged from the wells before sampling. <br /> Throughout purging and just before sampling the wells, the pH, specific conductivity, and <br /> ' temperature of the evacuated groundwater will be measured and recorded. These <br /> measurements will be made to confirm that the well is purged sufficiently. Water samples <br /> will be collected after the measurements stabilize to within 10 percent of the previous <br /> L readings. A sample well purging and sampling log is provided in Appendix B. <br /> LI Sampling will be performed using either a 2-inch-diameter Teflon or disposable <br /> polyethylene bailer suspended from a nylon line. If Teflon bailers are used, they will be <br /> decontaminated between each well using the procedures in Section 2.3.3. The bailers <br /> will be equipped with a bottom-release device. <br /> 1 <br /> Water samples will be collected from the wells in new bottles provided by the analytical <br /> laboratory. Water samples will be collected in 40-milliliter glass bottles with Teflon-lined <br /> caps. These samples will be collected so that no headspace is present in the bottle. A <br /> Ufield (equipment) blank will be collected after decontamination of the sampling <br /> equipment. A field blank will not be collected if the wells are sampled using disposable <br /> Lbailers. The samples will be. shipped to and analyzed by a State-certified laboratory <br /> following the.analytical program described in Section 3.1 . <br /> + 2.3 Field Quality Assurance/Quality Control (QA/QC) Procedures <br /> Procedures are described- below for preserving and transporting soil and groundwater j <br /> samples, decontaminating field equipment, managing wastes generated, and documenting <br /> the field program. <br /> L <br /> I � <br /> L. <br /> j 5ABFS\STOCKTON\WKPOO1.DOC 10/27/99 2-4 <br />