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MONITORING WELL CONSTRUCTION <br /> The potentiometric surface elevation in monitoring well MW1 was measured at a depth of <br /> 19.8 feet from ground surface prior to the start of well construction activities. The monitoring <br /> well borehole was drilled and sampled using a truck-mounted Mobile B-53 drilling rig and <br /> 7.25-inch diameter hollow-stem augers. See Figure 1 for the location of the monitoring well. <br /> Depth-integrated soil samples were collected every 5 feet from the borehole for laboratory <br /> analyses in 2.5-inch by 6-inch brass liners using the Moss sampling system. Auger flytes and <br /> other tools used in the borehole drilling and sampling operations were thoroughly steam <br /> cleaned before initial use. The sampler and brass liners were washed in a mixture of <br /> Liqui-Nox and clear water, rinsed in clear water, rinsed in distilled water, rinsed in deionized <br /> water, and allowed to air dry prior to their initial use and prior to subsequent use downhole. <br /> Soil samples were collected continuously with the MOSS sampler. The MOSS sampler was <br /> advanced with the auger string, removed from the borehole and hollow-stem auger string, and <br /> broken down into its component parts. The soil sample collected in the brass liner at the <br /> 5-foot interval was sealed, capped, labeled, logged on a chain-of-custody form, placed in an ice <br /> chest containing frozen cold packs and kept at 4°C for transport to AEMCs' State of <br /> California certified analytical laboratory. Appendix A contains the laboratory results. The <br /> contents of the remaining brass liners were extruded and logged using the Unified Soil <br /> Classification System and Munsell color charts. <br /> A soil sample was collected in a brass tube below the potentiometric surface to determine the <br /> sample's degree of saturation by standard geotechnical methods. The sample was sealed, <br /> capped, labeled, placed in an ice chest at 4^C and kept refrigerated until the degree of <br /> saturation was determined. The degree of saturation of this sample (EI) was determined to <br /> be 98.9 percent. Appendix B contains the associated drilling logs. <br /> rlg a l(�2.z) Page t <br />