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26 September 2008 <br /> AGE-NC Project No. 07-1587 <br /> Page 3 of 7 <br /> samples were extracted by hand bailing the boring with disposable 1/4 inch tubing and sampling <br /> valve. Each ground water sample was transferred into three laboratory-supplied, 40-m1 volatile <br /> organic analysis (VOA) vials, and one laboratory-supplied 1-liter amber bottle. After collection, <br /> samples were properly labeled,placed in a chilled container,and transported under chain-of-custody <br /> to CTEL. Samples were analyzed for the constituents listed in Section 2.2. <br /> 3.0. FINDINGS <br /> Stratigraphy and ground water hydrogeology underlying the site were characterized from field <br /> descriptions. Hydrocarbon impact to soil and ground water was assessed by laboratory analyses. <br /> Geomaps representing site location and site map were QA/QC checked and uploaded to the State <br /> Water Board GeoTracker site;confirmation numbers are 1721222400 and 6647612631,respectively. <br /> 3.1. STRATIGRAPHY <br /> In boring B 1,nearest to the former UST area,hydrocarbon-stained black,sandy silt was encountered <br /> between 5 feet and 10 feet bsg;silty clay was encountered between 13 feet and 25 feet bsg;grey,silt <br /> was encountered between 25 feet and 44 feet bsg; sandy silt was encountered between 44 feet and <br /> 48 feet bsg; and grey,medium grain,poorly graded sand was encountered between 48 feet and 54 <br /> feet bsg within a thin lens, approximately 6 inches, of sandy clay at 51 feet bsg. Hydrocarbon(HC) <br /> odor was observed in 10 of the 11 soil samples collected from boring B 1;organic vapor was detected <br /> utilizing an OVA in 10 of the 11 soil samples at concentrations ranging between 283 parts per <br /> million volume (ppmv; 50 feet bsg) and 1,794 ppmv (10 feet bsg). <br /> In boring B2, north of the former UST area,brown, dry silty clay was encountered between 5 feet <br /> and 10 feet bsg;grey silt of moderate consistency was encountered between 10 feet and 16 feet bsg; <br /> greyish-brown to grey sand was encountered between 16 and 30 feet bsg;silty clay was encountered <br /> between 30 feet and 35 feet bsg;greyish-brown siltwas encountered between 35 feet and 45 feet bsg; <br /> grey clay with gravel and high toughness was encountered between 45 feet and 47 feet bsg; grey <br /> sandy silt was encountered between 47 feet and 53 feet bsg; grey medium grain,poorly graded sand <br /> was encountered between 53 feet and 58 feet bsg; and grey silty clay with high toughness was <br /> encountered between 58 feet and 60 feet bsg. HC odor was observed in 5 of the 13 soil samples <br /> collected from boring 132; organic vapor was detected utilizing an OVA in 5 of the 13 samples at <br /> concentrations ranging between 6.8 ppmv (45 feet bsg) and 87.9 ppmv (40 feet bsg). <br /> Advanced GeoEnvironmental,Inc. <br />