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' to Jeff Hopkins on May 24, 1999 by Rafael L Galiardo <br /> ' The investigative work through November 2000 by others has included identifying <br /> petroleum hydrocarbon contamination in the locations of the four aforementioned asphalt <br /> cutback and fuel containing USTs, removed in 1987, some definition of lateral extent of <br /> ' contamination, identification of hydrocarbon contaminants (note no MTBE or fuel <br /> Oxygenates DIPE, ETBE nor TA was detected), locating a "shallow water body", and a <br /> ' request by Rafael L Gallardo Registered Geologist, that PHSIEHD consider granting site <br /> closure <br /> 12 Work in through April 2001 <br /> ' Additional characterization of the pollution extent and its impact on groundwater was <br /> conducted by D K Barber P E and Associates from October 2000 through April 2001 <br /> Borings were Initiated on November 13, 2000 Groundwater was not encountered until <br /> about 50 FT below ground surface (bgs) after very slow boring progress and operational <br /> problems The depth and sod material showed the direct push technology (DPT) rig to be <br /> too light duty and efforts were suspended awaiting clear weather and availability of a <br /> heavier DPT rig Boring resumed December 4, 2000 Equipment problems again resulted <br /> ' in suspension of site work until December 13 and 15, 2000 and January 4, 2001 activities <br /> Soil samples were collected at five FT intervals to groundwater approximately 52 FT bgs <br /> ' Soil samples were field classified using either a geologist or registered civil engineer Grab <br /> water samples were collected in boreholes and the constructed monitoring well <br /> Stellar Environmental Solutions, of Berkeley, CA , a Geoscience & Consulting firm, <br /> assisted with field classification, sample collection and graphical presentation The firm's <br /> ' registered Geologist and a second senior geologist were on the site during several <br /> different days, establishing its overall lithology, leading to the included graphical boring <br /> ' logs and brief summary of findings <br /> ' <br /> 12.1 Soil Borings <br /> Environmental Exploration, of Valley Springs, CA, a Licensed C-57 drilling contractor, <br /> using a Geoprobe 6600 Unit completed direct push borings with the heavy duty truck <br /> mounted machine, at five different locations (C-1, C-2, C-3, C-4, C-5) to encountered <br /> ' 1-2 <br /> I <br />