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Ms Vicky McCartney Project No 880-040 1A <br /> ► December 8, 2003 <br /> Page 5 <br /> then covered with asphalt cold patch Drilling and sampling procedures are presented in <br /> Attachment B <br /> SITE INVESTIGATION RESULTS <br /> Subsurface investigation <br /> Soil encountered during this investigation consists of interbedded gravelly sand, sand, <br /> silty sand, sandy silt, silt, sandy clay, silty clay and clay There appears to be/laterally <br /> continuous sand beds at depths of approximately 8 to 15 feet bgs and 28 to 40 feet bgs <br /> Below these sand horizons are many discontinuous thin layers of clay and other stiff fine <br /> grained material A more complete description of the subsurface lithology encountered <br /> is shown on the boring logs included in Attachment C, and in the cross section shown on <br /> Figure 3. <br /> Groundwater Analytical Results <br /> TPHg were reported in only one discrete/groundwater sample, from boring CPT-4 at 15 <br /> 1� <br /> 25 feet bgs at concentrations of 370 ug/l Benzene was reported in boring CPT-3 at 41 <br /> and 57 feet bgs at concentrations of 2 5 and 13 ug/l, respectively /Benzene was not E a t <br /> reported in any other groundwater samples MtBE or TAME were not detected in ani <br /> other groundwater samples DIPE, ETBE, TBA, EDB, and 1,2-DCA were not detected <br /> in any groundwater samples Groundwater analytical data are summarized in Table 1 <br /> G <br /> The laboratory analytical report with chain-of-custody documentation is included in <br /> Attachment D i4r <br /> b <br /> rINVESTIGATION-DERIVED WASTE DISPOSAL <br /> Obs - 000 <br /> Ir <br /> No drill cuttings were produced Decontamination water was removed from the site by \ ' <br /> the drillersk <br /> 0,00 1� <br /> 1 � <br /> i� <br /> 1 <br /> N 1sacQP120031Pg1881880040 1 A 3aa doc <br />