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b7 • 3 SCOPE OF WORK Following is a detailed description of the field procedures utilized during the recent soil and ground-water characterization. These procedures were conducted consistent with the approved work plan. The scope of work for this project included the following tasks: • drilling one exploratory soil boring • collecting and analyzing soil samples • installing a ground-water monitoring well • developing and sampling the ground-water monitoring well • submitting selected soil samples and the ground-water sample for chemical analysis 3.1 Exploratory Soil Boring On May 28, 1991, one exploratory soil boring (MW-1) was drilled through the center of the former excavation at the location shown on Figure 5. The soil boring was drilled using 8-inch-diameter hollow-stem auger drilling equipment. Soil samples were collected at 5-foot intervals in advance of the auger bit with a modified California split-spoon sampler containing stainless steel liners. These samples were collected for geologic interpre- tation and chemical analysis. Representative soil samples from each sam- pling interval were sealed in stainless steel liners with Teflon(D tape and plastic end caps, placed in ziploc bags, and stored on ice pending selec- tion for chemical analysis. Exploratory boring and well installation proce- dures are presented in Appendix A, and the exploratory boring logs are presented in Appendix B. The sampling equipment was cleaned between sampling events. The cleaning involved washing with a trisodium phosphate solution, followed by rinsing with tap water. Soil samples were screened in the field by performing visual, olfactory, and head-space analysis using a portable photoionization detector (PID). The vadose zone soil samples with the highest PID indication of contami- pig1g051g050101cI 3 Rev. 0 July 2, 1991 EmcoJn Associates __J