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' CJeofnnaf`Iechnus Inc Page 3 <br /> s.te Characterization Report <br /> Valentine(Castle Motors) <br />' Project No 723 2 <br /> October 4, 2999 <br /> •' was identified and labeled with a unique designation, inserted 9 g d into foam holders and placed <br /> in an ice chest cooled to 4°C for transport to the laboratory <br /> Details on the geology encountered during the completion of the soil sampling as well as the <br />' field observations are included in Section 3 2, Geology and Field Observations <br /> 2.1.2 Laboratory Analyses <br />' Soil <br /> One soil sample from borehole MW-101 and three soil samples from borehole SB-201 were <br /> submitted to Sherwood Laboratories of Hilmar, California (State Certified Laboratory #1400) <br /> for the following analysis <br />' 0 benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8020 <br /> C gasoline-range petroleum hydrocarbons (TPH-G) by EPA method 8015(m) <br /> 0 oxygenated fuel compounds (MTBE, DIPE, ETBE, TAME and TBA) by EPA method <br />' 8260 <br /> Water <br />' Two soil-porewater samples from borehole MW-101 and one soil-porewater sample from <br /> borehole SB-201 were submitted to Sherwood Laboratories of Hilmar, California (State <br /> Certified Laboratory #1400) for the following analysis <br />' 0 benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 602 <br /> 0 gasoline-range petroleum hydrocarbons (TPH-G) by EPA method 8015(m) <br /> 0 oxygenated fuel compounds (MTBE, DIPE, ETBE, TAME and TBA) by EPA method <br /> 10 <br /> 8260 <br /> A chain of custody was completed for all samples submitted and tracked to ensure sample <br /> integrity <br />' 2.2 Monitoring Well Installation <br /> I To investigate the presence of gasoline-range petroleum hydrocarbons in the groundwater at <br /> this site, Geological Technics Inc installed one groundwater monitoring well (MW-101) on <br /> the west side of the former pump island location (Figure 2, Site Map) This well was <br /> installed to investigate the vertical extent of hydrocarbons in the soil and groundwater <br /> The monitoring well was constructed using 2-inch diameter PVC casing with flush threads <br /> The table below shows the construction details <br /> IWell No. ia. Screen at an ac rans. ea rout ea <br /> —MW- - san - ace- <br /> IA surface seal was achieved by pumping a neat cement grout via a tremae tube (augmented <br /> with <4% bentonite) to the surface The well was secured with a locking watertight cap <br /> encased in flush mounted traffic-rated well box <br /> On September 10, 1999, Don Light of Del Tech mobilized to the site to develop the new <br /> monitoring well (using mechanical surging and pumping methods) until a clear stream of <br /> Iwater was obtained <br /> iOn September 13, 1999, Don Light returned to the site to purge and collect groundwater <br /> samples from the seven monitoring wells and one domestic well All development and purge <br /> I <br />