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To further define the extent of residual soil contamination in the vicinity of the former <br /> underground fuel storage tank (UST), Smith Environmental supervised the advancement of four <br /> soil bonngs (SB-1, SB-2, SB-3, and SB-4) on February 29, 1996 to depths of approximately 16 <br />' to 26 feet bgs Total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, <br /> ethylbenzene, and xylenes (BTE3) were detected above method detection limits at low to <br /> ,I <br />' moderate concentrations in samples collected at depths between 10 and 15 feet bgs in borings SB- <br /> I, SB-2, and SB-3 A detailed discussion of this subsurface investigation can be found in Smith <br />' Technology's Subsurface Investigation Report, dated April 30, 1996 <br />' OBJECTIVE AND SCOPE OF SITE ASSESSMENT <br /> The purpose of this work was to attempt to define the extent of residual soil contamination at the <br />' site as requested by PHS/EHD The work performed for this investigation included locating <br /> underground utilities, obtaining permyts from the PHS/EHD, advancing six soil borings, collecting <br />' soil samples, and, submitting selected soil samples for laboratory analysis <br /> All drilling activities were performed under the supervision of a Smith Technology field geologist <br /> All site work was performed in accordance with the field methods included in Smith Technology's <br /> Workplan for Additional Subsurface Investigation, dated July 30, 1996 <br /> FIELD INVESTIGATION <br /> Y <br />' Soil Borinzs <br /> On February 13, 1997, six soil borings (SB-5, SB-6, SB-7, SB-8, SB-9, and SB-10) were <br />' advanced to depths of approximately 16 to 25 feet bgs The boring locations are shown on Figure <br /> 2 V►ronex Environmental Field Services of Hayward, California (C57# 705927) advanced the <br />' bonngs using Direct Push Technology (DPT), specifically the Geoprobe Systems Model 5400 <br /> sampling system A field geologist was present to log all drill cuttings and soil samples utilizing <br />' the Unified Soil Classification System Descriptions of soil types encountered and sample <br /> collection intervals were recorded on boring logs included in Appendix I Soil samples were <br /> collected every 5 feet in brass tubes Soil samples were field screened with a photo-ionization <br /> . w%94334�repo \sumtyrptdoc 3 <br /> SMTH <br />