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Libbey Owens Ford Co.-Preliminary Soil and Groundwater Investigation Report <br /> Standby Generator Diesel Supply Line <br /> January 20, 1997 - <br /> Page-3- <br /> more mobile fractions of the diesel fuel (i.e., BTEX) have migrated downward ahead of the main <br /> ' plume. <br /> Based on the above described investigation and remedial activities, Ron Rowe of the San <br /> ' Joaquin PHS/EHD, in a letter (undated) to Mr. Jon Weiss of LOF, requested that LOF submit a work <br /> plan to conduct an investigation to study the extent of soil and groundwater impacted by the diesel <br /> ' release. Condor subsequently prepared and submitted the work plan, dated November S, 1996, <br /> describing methods and procedures for conducting the work documented in this report. <br /> 1 <br /> 3.0 FIELD INVESTIGATION <br /> ' 3.1 Site Preparation <br /> Underground utilities located within the proposed work area were identified by LOF prior to <br /> the fieldwork. Drilling permits were obtained from the PHSIEHD for the Geoprobe sampling. Ron <br /> Rowe of the PHS/EHD was notified of the fieldwork schedule at least 48 hours in advance. <br /> I <br /> 3.2 Geoprobe Sampling Procedures <br /> The fieldwork included the placement of eleven (11) Geoprobe sampling boreholes at the <br /> locations shown on Figure 3, Appendix A. The Geoprobe borings were advanced by Vironex <br /> ' Environmental Services of Foster City, California. A description of the Geoprobe sampling system is <br /> contained in Appendix B of this document. A Condor geologist was on site to direct all sampling <br /> ' activities and fieldwork. Prior to commencement of the fieldwork, a tailgate safety meeting was held <br /> and a site-specific Health and Safety Plan discussed with, and presented to, all crew members for their <br /> 1 signatures. <br /> ' The Geoprobe boreholes were hydraulically advanced using a 2-inch diameter conical bit. The <br /> rods and bit were thoroughly cleaned before each borehole was advanced using laboratory grade, non- <br /> phosphate detergent and hydrocarbon free water and double rinsing with hydrocarbon free water. The <br /> ' boreholes were advanced to approximately four (4) feet below the shallow unconfined groundwater <br /> ' table, which was encountered at approximately l l feet below the ground surface (bgs). <br /> ' �� CONDOR <br />