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26 September 2008 <br /> AGE-NC Project No. 07-1587 <br /> Page 4 of 7 <br /> In boring B3,east of the former UST area,brown sandy clay to silty clay was encountered between <br /> 5 feet and 10 feet bsg;sandy clay was encountered between 10 and 24 feet bsg;grey-brown silty clay <br /> was encountered between 24 feet and 25 feet bsg;brown medium grain,poorly graded silty sand was <br /> encountered between 25 feet and 27 feet bsg; brown medium grain, poorly graded sand was <br /> encountered between 27 feet and 29 feet bsg; black to greyish brown medium grain,poorly graded <br /> sand with gravel was encountered between 29 feet and 43 feet bsg; grey sandy silt was encountered <br /> between 43 feet and 51 feet bsg; and grey medium grain,poorly graded silty sand was encountered <br /> between 51 feet and 53 feet bsg. HC odor was observed in 5 of the 13 soil samples collected from <br /> boring B3;organic vapor was detected utilizing an OVA in 5 of the 13 soil samples at concentrations <br /> ranging between 0.9 ppmv (40 feet bsg) and 383 ppmv (50 feet bsg). <br /> In boring B4, south of the former UST area,brown silty clay was encountered between 5 feet and <br /> 10 feet bsg; brown silt was encountered between 10 feet and 18 feet bsg; brown sandy silt was <br /> encountered between 18 feet and 27 feet bsg; brown medium grain, poorly graded sand was <br /> encountered between 27 feet and 33 feet bsg; and grey sandy silt was encountered between 44 feet <br /> and 50 feet bsg.HC odor was observed in 6 of the 10 soil samples collected from boring B4;organic <br /> vapor was detected utilizing an OVA in 6 of the 10 soil samples at concentrations ranging between <br /> 43 ppmv (50 feet bsg) and 1,535 ppmv (35 feet bsg). <br /> In boring B5, southwest of the former UST area, brown gravelly to silty clay was encountered <br /> between 5 feet and 10 feet bsg;greyish brown silty claywas encountered between 10 feet and 15 feet <br /> bsg; greyish brown sandy silt was encountered between 15 feet and 17 feet bsg;greyish-brown silty <br /> claywas encountered between 17 feet and 19 feet bsg;grey silt was encountered between 19 feet and <br /> 27 feet bsg; brown sandy silt was encountered between 27 feet and 29 feet bsg; brown to greyish <br /> brown silts were encountered between 29 feet and 44 feet bsg; grey silty clays were encountered <br /> between 44 feet and 53 feet bsg;grey silt was encountered between 53 feet and 57 feet bsg;and there <br /> was no recovery of the sample at 60 feet bsg,however remnants of a medium grain,poorly graded <br /> sand remained on the sampler.HC odor was observed in 1 of the 14 samples collected from boring <br /> B5 at a depth of 35 feet bsg; organic vapor was detected in this sample utilizing an OVA at a <br /> concentration of 26.7 ppmv. <br /> In all the borings, first ground water was encountered between approximately 17 and 20 feet bsg. <br /> Boring logs are provided in Appendix C; a geologic cross-section showing the lithology east across <br /> the site utilizing borings B 1 and B3 with infield PID readings is shown in Figure 3.Geobores for B 1 <br /> through B5 were QA/QC checked and uploaded to the State Water Board GeoTracker site; <br /> confirmation numbers are 1404354274,8618971884,9440886557,9051163196,and 7515669882, <br /> respectively. <br /> Advanced GeoEnvironmental,Inc. <br />