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�- BC&D Properties <br /> Report, MW Installation and Monitoring <br /> Project No. 8.1.2 <br /> December 17, 1992 <br /> Page 8 <br /> r <br /> 5.8 Groundwater Sampling Procedure <br /> The wells were purged and sampled by GeoAnalytical personnel. Their <br /> sampling protocol reportedly is as follows: <br /> The sampling technician unlocks the well and measures the depth to water. <br /> Then, using a Teflon bailer, the technician purges stagnant water from the well <br /> casing and the well is allowed to recharge. The well is sampled using a Teflon <br /> bailer. The bailer is lowered into the well and carefully allowed to fill with <br /> LN water. The bailer is raised from the well taking precaution not to agitate the <br /> contained water. An emptying device is coupled to the bailer and the water is <br /> slowly transferred into the sample container (40 ml VOA vials). The vial is <br /> capped, inverted, and tapped to check for any air bubbles that may be contained <br /> within the sample vial. After assuring that no air bubbles are contained in the <br /> sample, the vial is labeled and inserted into a closed cell foam holder and placed <br /> �.. in an ice chest at 4° Celsius for transport to the laboratory. Before sampling the <br /> next well, the Teflon bailer is decontaminated with Liquonox detergent and <br /> deionized water and a bailer blank is collected to assure bailer cleanliness and to <br /> �- protect against cross contamination. <br /> To monitor possible cross contamination by the lab, a trip blank prepared from <br /> distilled deionized water by the lab is carried throughout the sampling, storage, <br /> and shipping process. <br /> `' A chain of custody document is then filled out listing all samples collected. This <br /> document is used to track the samples and to ensure their integrity. <br /> 5.9 Cross Contamination Prevention <br /> All sample equipment (split spoon sampler, and brass tubes) and auger (drilling <br /> rod, drilling bits, & auger) were thoroughly steam cleaned before being used and <br /> between uses. Plastic gloves were worn while collecting and changed between all <br /> L. samples. <br /> 5.10 Chain of Custody <br /> Chain of Custody (CofQ forms are legal documents used to track the handling of <br /> +. samples All dates, times, and persons are listed from the time the sample is <br />