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S <br /> QRION <br /> 2.2.1 Monitoring Well Locations <br /> Orion will drill and install three groundwater monitoring ' 'Wells at the locations shown on <br /> Figure 2. These locations may-be modified depending on actual site conditions and <br /> access considerations. Figure 3 shows the well construction details for the wells. <br /> .L` <br /> 2.2.2 Drilling and Soil Sampling Procedures <br /> Borings for the monitoring wells will be drilled with 8- to 10-inch-diameter, hollow-stem, <br /> l <br /> continuous-flight augers. Soil samples will be collected with a split-barrel sampler <br /> containing three brass tubes, each 2 inches in diameter and 6 inches in length. The <br /> sampler will -be driven to the sampling depth by dropping a 140-pound hammer <br /> approximately 30 inches. Samples will be collected at 5 feet below ground surface and at <br /> 5-foot intervals thereafter to 40 feet or termination as appropriate. <br /> Immediately after the sampler is .retrieved fromthe auger, it will 'be placed on a portable <br /> field stand near the boring, and the brass tubes will .be removed. The ends of the second <br /> or third tube will be covered with Teflon sheeting or aluminum foil, capped with <br /> polyvinyl chloride (PVC) end caps, and placed, in a sealable plastic bag. The sealed tubes <br /> will then be placed in a portable ice chest and cooled with ice. <br /> Sample labels will be used to 'identify the soil-filled brass tubes. The label information <br /> ' will include project number, project name, monitoring well number, sample number, <br /> .sample depth, date, time, and name of the person preparing the samples. <br /> A portion of the soil from one of the remaining tubes will be extruded and placed in a <br /> ' sealable plastic bag, which will then be closed and allowed to equilibrate for <br /> r <br /> approximately 10 minutes. The organic vapor levels in the headspace will be measured <br /> using a field PID. The same sample will be visually examined and the results of the visual <br /> observation and headspace reading will be recorded on the well installation logs. Sample <br /> boring and well installation logs are provided in Appendix B. <br /> S:\BFS\STOCKTON\WKP001.DOC 10/27/99 2-2 <br /> ]moi] <br />