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Mr Jeffrey Wong C A M B R I A February 23, 2006 . coverings, and pneumatic submersible pumps and started up the system on September 29, 2005 These activities are described in Cambria's October 12, 2005 Interim Remedial Action Plan Table 1 presents well and boring data, Table 2 presents historical soil analytical data, and Table 3 presents historical grab groundwater analytical data Sod boring and well locations are shown on Figure 2 INVESTIGATION SUMMARY Cambria directed the installation of groundwater monitoring wells MW-12 through MW-15 and soil boring SB-6 at the locations shown on Figure 2 Cambria presents our standard field procedures for soil boring and monitoring well installation in Attachment A and summarizes the details of the investigation below Personnel Present Cambria Staff Geologist Ron Barone directed the field activities, working under the supervision of California Professional Geologist Aubrey Cool Permit Cambria obtained well permit (Permit SR # 44787) from the SJCEHD (Attachment B) Drilling Company Gregg Drilling and Testing, Inc of Martinez, California (C57 License No 485156) Drilling Dates November 21 through 29, 2005 Drilling Method 10-inch hollow-stem augers Number of Borings Five borings were drilled (SB-6 and MW-12 through MW-15) and four were converted into monitoring wells (MW-12 through MW-15) Well construction specifications are summarized in Table 1, and well and boring locations are shown on Figure 2 Boring Depths Borings SB-6, MW-12, MW-13, MW-14, and MW-15, were advanced to 65 fbg, 65 fbg, 70 fbg, 64 fbg, and 100 fbg, respectively Groundwater Depths Cambria observed first-encountered groundwater during drilling activities in borings SB-6 and MW-12 through MW-15 at depths • ranging from approximately 55 to 59 fbg Blaine Tech Services, Inc (Blaine) of San Jose, Califomia measured groundwater in 5