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• • <br /> G¢ologkal Technics Inc. Page 6 <br /> Geoprobe Investigation <br /> Project No. 425.2 <br /> September 18,2008 <br /> These observations include: <br /> ■ Capillary Fringe <br /> ■ Sediment type,especially grain size and clay content <br /> ■ Moisture content <br /> ■ Visible evidence of contamination, i.e., color change due to reduction of iron or <br /> discoloration from hydrocarbons and other pollutants <br /> • Readings above background on an photo ionization detector(PID) <br /> The PID is a portable photo ionization detector that uses a 10.6 eV lamp to detect compounds <br /> with ionization potential below 10.6 eV (hydrocarbon range). <br /> The soil samples identified as containing the relatively highest concentration of petroleum <br /> hydrocarbon constituents from each geologic unit will be tested as outlined below. <br /> 2.1.2 Soil Laboratory Analysis <br /> Based on field screening observations, up to three soil samples from each geoprobe will be <br /> submitted to a state certified laboratory for the following analysis: <br /> ■ Benzene,toluene, ethyl benzene and xylenes (BTEX)by EPA method 8260 <br /> ■ Gasoline range petroleum hydrocarbons (TPH-G)by EPA method 8015 <br /> ■ Fuel Oxygenates (MtBE,DIPE, ETBE, TAME and TBA)by EPA method 8260 <br /> ■ EDB and 1,2-DCA by EPA method 8260 EPA method 200.7 <br /> ■ Arsenic(As), Chromium(Cr), Iron(Fe) and Manganese(MN)by <br /> The detection limits for these compounds are listed below. <br /> Detection Limits: BTEX Fuel Ox enates 1,2-DCA &EDB TPH1000 line <br /> Soil ( ) 3.0 50 50 <br /> Iron Man anese <br /> Detection Limits: Arsenic Chromium Ir1 1 <br /> Soil(m ) 0.4 0.1 <br /> A Chain of Custody will be completed for all samples collected and tracked to ensure sample <br /> integrity. <br /> 2.1.3 Groundwater Laboratory Analysis <br /> The groundwater samples from the soil boring hydropunch will be submitted to a state <br /> certified laboratory for the following analysis: <br /> ■ Benzene, toluene, ethyl benzene and xylenes (BTEX)by EPA method 8260 <br /> ■ Gasoline range petroleum hydrocarbons (TPH-G)by EPA method 8260 <br /> ■ Fuel Oxygenates (MtBE,DIPE,ETBE,TAME and TBA)by EPA method 8260 <br /> method 200.7 <br /> ■ Arsenic(As), Chromium(Cr), Iron Manganese <br /> (MN)by <br /> EPA■ Hezavalent Chromium, Cr(VI),by EPA method <br />