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Site Background Information: Cancun Restaurant <br /> Page 3 of 4 <br /> SITE STRATIGRAPHY <br /> In boring B1, nearest to the former UST area, hydrocarbon-stained black, sandy silt was <br /> encountered between 5 feet and 10 feet bsg; silty clay was encountered between 13 feet <br /> and 25 feet bsg; grey, silt was encountered between 25 feet and 44 feet bsg; sandy silt <br /> was encountered between 44 feet and 48 feet bsg; and grey, medium grain, poorly graded <br /> sand was encountered between 48 feet and 54 feet bsg within a thin lens, approximately <br /> 6 inches, of sandy clay at 51 feet bsg. Hydrocarbon (HC) odor was observed in 10 of the <br /> 11 soil samples collected from boring 61; organic vapor was detected utilizing an OVA in <br /> 10 of the 11 soil samples at concentrations ranging between 283 parts per million volume <br /> (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 <br /> 5 feet and 10 feet bsg; grey silt of moderate consistency was encountered between 10 feet <br /> and 16 feet bsg;greyish-brown to grey sand was encountered between 16 and 30 feet bsg; <br /> silty clay was encountered between 30 feet and 35 feet bsg; greyish-brown silt was <br /> encountered between 35 feet and 45 feet bsg; grey clay with gravel and high toughness <br /> was encountered between 45 feet and 47 feet bsg; grey sandy silt was encountered <br /> between 47 feet and 53 feet bsg; grey medium grain, poorly graded sand was encountered <br /> between 53 feet and 58 feet bsg; and grey silty clay with high toughness was encountered <br /> between 58 feet and 60 feet bsg. HC odor was observed in 5 of the 13 soil samples <br /> collected from boring B2; organic vapor was detected utilizing an OVA in 5 of the 13 <br /> samples at concentrations ranging between 6.8 ppmv(45 feet bsg)and 87.9 ppmv(40 feet <br /> bsg). <br /> In boring B3, east of the former UST area, brown sandy clay to silty clay was encountered <br /> between 5 feet and 10 feet bsg; sandy clay was encountered between 10 and 24 feet bsg; <br /> grey-brown silty clay was encountered between 24 feet and 25 feet bsg; brown medium <br /> grain, poorly graded silty sand was encountered between 25 feet and 27 feet bsg; brown <br /> medium grain, poorly graded sand was encountered between 27 feet and 29 feet bsg; <br /> black to greyish brown medium grain, poorly graded sand with gravel was encountered <br /> between 29 feet and 43 feet bsg; grey sandy silt was encountered between 43 feet and 51 <br /> feet bsg; and grey medium grain, poorly graded silty sand was encountered between 51 <br /> feet and 53 feet bsg. HC odor was observed in 5 of the 13 soil samples collected from <br /> boring 133; organic vapor was detected utilizing an OVA in 5 of the 13 soil samples at <br /> concentrations 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 <br /> feet and 10 feet bsg; brown silt was encountered between 10 feet and 18 feet bsg; brown <br /> sandy silt was encountered between 18 feet and 27 feet bsg; brown medium grain, poorly <br /> graded sand was encountered between 27 feet and 33 feet bsg; and grey sandy silt was <br /> encountered between 44 feet and 50 feet bsg. HC odor was observed in 6 of the 10 soil <br /> samples collected from boring B4; organic vapor was detected utilizing an OVA in 6 of the <br /> Advanced GeoEnvironmental,Inc. <br />