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Subsurface Investigation Report,Tosco(Former BP)Service StationNo 11 192 �i June 8,2001 3.0 FIELD WORK Field work was conducted in accordance with GR's Field Methods and Procedures (Appendix A), the GR Health and Safety Plan and Site Safety Plan dated April 23, 2001 Geoprobes0 and CPT borings were advanced under drilling permit numbers 0025915 through 0025918, issued April 20, 2001, by PHS-EHD Encroachment permit numbers EPO1-084-CC and EPO1-085-CC from the San Joaquin County Department of Public Works, were issued April 18, 2001 for the advancement of Geoprobes B-2 through B-4, B-7 and B-8 Geoprobe B-1 was advanced under encroachment permit number 66372, issued April 16, 2001, by the City of Stockton Department of Public Work Copies of the permits are included in Appendix B Underground Service Alert (USA) was notified prior to drilling at the site As a precautionary measure, a private utility locator was contracted to identify utilities near the proposed boring locations The borings were hand excavated, with a 3 inch diameter hand auger, for the first five feet bgs to insure that no utilities were disturbed 3.1 Geoprobe®Advancement On April 24 and 25, 2001, a GR geologist observed Fisch Environmental Exploration Services (C57 •� #683865) advance six offsite Geoprobes (B-1 through B-4 and B-7 and B-8), two onsite geoprobes (B-5 and B-6) and two onsite CPT boring (CPT-1) All borings were advanced with a truck mounted rig and locations of the borings are shown on Figure 2 The geoprobe borings were advanced to 17 feet bgs Soil sampling for lithologic logging was conducted continuously beginning at 5 feet bgs Soil samples from selected depths were collected for chemical analysis The soil samples were handled in accordance with GR Field Methods and Procedures ( Appendix A) The GR geologist prepared logs of the Geoprobes and screened the samples in the field for the presence of volatile organic compounds Screening data and the depths at which soil and groundwater samples were collected are presented on the boring logs in Appendix B 3.2 Groundwater Sampling After,groundwater was encountered, probing was halted and grab groundwater samples were collected from each boring with a disposable teflon bailer The samples were decanted into the appropriate laboratory-supplied containers, as described in GR's field methods and procedures (Appendix A) 14024503-3 3