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,. a er,. ::, ,r,�ss�.. ,tl..-. aw.r•+�,irs � �,�. =rr _ rom-� n�»r:• _ ,�7 � � � <br /> the baring/well log; (Appendix II). Cored soil samples were <br /> collected at meter <br /> five foot intervals using a 2-inch Thecored <br /> split-spoon sampler containing three brass tubes. <br /> samples and drill cuttings were characterizedfor Soil contaminatpion <br /> moisture content, and evidence of petroleum <br /> Moreover, a <br /> (i.e. soil discoloration or petroleum odors). screening <br /> photaionization detector (PIA) was used as a <br /> n vapors in <br /> deviceSoilandfor the ecored samplesQction of leSoiluiTt ysamplesowere tested <br /> dril to an <br /> presentative amount a ount iofb materialt into ndard <br /> with the PID (calibrated <br /> by placing a rep the headspace after a suitable <br /> plastic bag and analysing <br /> l samples collected at th materitable i n erface <br /> period. Sai <br /> were submitted for laboratory <br /> transportation difficulties, the samples were held past <br /> transportation <br /> accePtatle holding times and therefore could anon ugh <br /> analyzed. Field PID measurements, providing <br /> ion, are summarized in Table 2. <br /> estimation of soil contaminat <br /> 3.2 Subsurface conditions <br /> Soils encountered beneathoapproximately site <br /> feet t below grade,arand <br /> of silt (ML) to app- graded <br /> sand <br /> poorly graded sand with silt (SP-SM) to well g <br /> (SW) from approximately 8-28 feet below shown grade, the maximum <br /> in <br /> depth explored. Site stratigraphy <br /> Slight 4. <br /> to moderate product odors were noted in soil boring <br /> S13, Relatively high concentrations 406 ppm of hydrocarbon <br /> vapors were detected by <br /> the PIA in boring MW3. Product <br /> and mW2. <br /> odors ngs MWl <br /> lateralhe estimated <br /> eandre nverticaot l extent in iand concentrations TOf petroleum <br /> la at the project site are <br /> hydrocarbon contamination ('I'PiiG) <br /> depicted in Figure 4. <br /> approximately <br /> feet <br /> 12.5 to 13.0 <br /> GLsundwater was encountered at app <br /> feet below grade. <br /> 3.3 Monitoring well construct_-n <br /> eted <br /> Soil <br /> borings <br /> undwate rmoni or�i.ng weandlls•were <br /> Thesmonitoringywellslwere <br /> as installed to assess the extent of groundwater contamination <br /> beneath the site, and to provide measurement points for the <br /> determination of groundwater flow direction and hydraulic <br /> gradient. Figure 3 shows the locations of the wells- <br /> Each well was constructed with. 2-inch F480 polyvinyl <br /> chloride (PVC) casing. The screened interval of each well <br /> 15 feet <br /> was positioned from approximately five feet abovefor tofor <br /> below the encountered water table to allow <br /> water level fluctuations. The screen slot size is 0.01 inch. <br /> 3 <br />