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Mr Ronald Rowe <br /> • March 4, 1998 <br /> Page 2 <br /> (WKA) Petroleum hydrocarbons were not identified in the one sample, but detectable <br /> concentrations were recorded in the other sample <br /> T&T Trucking started excavation of the petroleum hydrocarbon-impacted soil on <br /> March 30, 1995 Approximately 250 cubic yards of soil was removed and stockpiled at the <br /> site A total of 10 soil samples were collected by WKA from the sidewalls and cavity bottom <br /> in June, 1995 The stockpile was also sampled for laboratory analysis Analytical soil results <br /> indicated no detectable concentrations of petroleum hydrocarbons along the sidewalls at a <br /> depth of 9 feet, the bottom of the cavity, and the stockpiled soil The excavation was <br /> backfilled with the stockpiled soil <br /> In September 1995, the excavation was expanded to the west by T&T Trucking An <br /> estimated 50 cubic yards of soil was excavated Six soil samples were collected from the <br /> bottom of the excavation by WKA Analytical results identified very low concentrations of <br /> petroleum hydrocarbons The excavation was backfilled in December, 1995 using the <br /> stockpiled soil <br /> In November 1995, Leeward Consultants was retained by T&T Trucking to oversee the <br /> drilling of ten borings, soil sample collection, and installation of one groundwater monitoring <br /> . (MW-1) Soil sample results indicated the extent of petroleum hydrocarbons was defined to <br /> an area approximately 30 feet in width by 60 feet in length, encompassing the western portion <br /> of the UST excavation to southwest of MW-1 The vertical extent of the petroleum / <br /> Hydrocarbon impacted soil is limited in depth from approximately 15 feet bgs to groundwater, <br /> though the most significant concentrations are above approximately 40 to 50 feet b s As a <br /> result of this investigation, Ce lateral an v ica extent o petro eum rocarbons in soil <br /> havew eeb d ned a extent of petroleum hydrocarbons in groundwater as no een <br /> `defin-ed <br /> The Iithology of the site includes interbedded silts to sands to the maximum depth explored of <br /> 91 feet Groundwater is approximately 78 feet bgs The flow direction and gradient are <br /> unknown <br /> Scope of Work <br /> This section describes the proposed scope of work for the borehole drilling, soil sampling, <br /> HydroPunchO groundwater sampling, groundwater monitoring well construction, and <br /> groundwater well development and sampling <br /> Use or disclosure of data continued on this sheet is subject to the restriction specified at the beginning of this <br /> document <br /> iMELIGE\162711WKkPL\COC <br />