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Harding Lawson Assoclall <br /> FIELD INVESTIGATION <br /> underground Utility Loca ians <br /> HLA retained California Utility Surveys to locate on-site <br /> underground utilities in the vicinity of the monitoring well <br /> locations. The survey was completed on June 11, 1991. Plate 2 <br /> illustrates the approximate locations of underground water lines, <br /> electrical lines, storm drains, septic tanks, and leach fields. <br /> Monitoring Well Installation <br /> After obtaining monitoring well permits from the EHD, on <br /> July 1, and 2, 1991, HLA installed three monitoring wells (MW-1, <br /> MW-2, and MW-3) . The locations of these wells are shown on Plate <br /> 2. Drilling and sampling methodology is presented in Appendix B. <br /> Soil cuttings were temporarily stockpiled on-site until chemical <br /> rile <br /> results were received. Because only trace concentrations of <br /> toluene were found in the soil, HLA plans to spread the cuttings <br /> on-site. <br /> •-� Soil samples, collected approximately every five feet, were <br /> ti screened in the field with a photoionization detector (PID) and <br /> logged by an HLA geologist according to the Unified Soil <br /> Cyassification System (USCS) . Boring logs are presented in <br /> Appendix C. Soil samples were sealed with aluminum foil, plastic <br /> end caps, teflon and electrical tape, and immediately stored in a <br /> cooled ice chest. Six soil samples were delivered under chain- <br /> of-custody procedures to National Environmental Testing . <br /> 5 _ <br /> 3 <br />