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' Geofagupl'IecFrnrrs Zrtc Sozl& Groundwater Investigation Report Page 2 J M Equipment Project No 507 2 June 9, 1999 2.0 SCOPE OF INVESTIGATION The purpose of this work was to further investigation of the lateral and vertical extent of soil and groundwater contamination On April 5 & 6, 1999, Geological Technics Inc installed two hand augured boreholes to 15 feet bgs, three soil borings to 30 feet bgs and one soil boring to 70 feet bgs Three water table monitoring wells were also installed at the site to a ' depth of 35 feet bgs 2.1 Soil Boring Installation ' A monitoring well permit was secured from San Joaquin County and the agency was notified 48 hours prior to commencing work The subsurface was cleared of underground utilities by notifying Underground Service Alert and by consulting with the property owner ' Shallow Sail Borings In an effort to define the lateral extent of petroleum hydrocarbons, five (5) soil borings, SB-1 ' through SB-5 were advanced Three other soil borings were converted into monitoring wells The soil borings were drilled as follows • Geological Technics Inc personnel under the supervision of V&W Drilling drilled SB-1 and SB-5 Hand auger equipment was used for these two borings because they were ' placed under the overhang of the Hesston Shop The borings were drilled to a depth of 15 feet bgs and samples were collected continuously for geologic logging Bottom hole samples were collected analytical evaluation • S13-2, SB-3 and S13-4 were drilled using an 8-inch outside diameter (o d ), continuous flight, hollow stem auger owned and operated by V&W Drilling (C574 720904) The borings were drilled to a depth of 30 feet bgs Soil samples were collected as described in Section 2 1 1 0 Soil borings for MW-4, MW-5 and MW-6 were drilled to a depth of 35 feet bgs with an 8-inch outside diameter (o d ), continuous flight, hollow stem auger owned and operated by V&W Drilling Soil samples were collected as described in Section 2 1 1 These ' borings were converted into 2-inch diameter monitoring wells NOTE: These wells (MW-4, MW-5 and MW-6) were originally named as JM-1, JM-3 and ' JM-2, respectively, in the work plan However, since J M Equipment has inherited four monitoring wells previously installed and owned by Independent Trucking, the numbering scheme for the J M Equipment well have been changed to fit into the numbering scheme of the Independent Trucking wells ' Deep Soil Boring To define the vertical extent of petroleum hydrocarbons, one (1) soil boring, SB-109 was - - advanced to 70 feet bgs It was planned to install a 2-inch, discretely screened monitoring well in this boring, however the geology in the borehole, plastic clays, was not conducive to this Soil samples were collected as described in Section 2 1 1 The boring was closed by Pressure grouting a neat cement grout though a tremie tube The grout was brought to ground surface and the hole in the concrete was finished with a concrete cap Soil cuttings and drilling decontamination water were placed in DOT-17 55-gallon drums and placed alongside the building until disposal can be arranged i