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sampler,vertically to depths of 60 feet bsg. <br /> Grab ground water samples were collected from each probe boring using a Geoprobe hydropunch <br /> sampling assembly. The probe rods were advanced to approximately 60 feet bsg. <br /> TPH-g was detected in the water samples collected from B8 and B9 at concentrations of <br /> 71 micrograms per liter(µg/1)and 88 µg/l, respectively. TPH-d was detected in the water sample <br /> L collected from B9 at a concentration of 140 µg/1. Ethylbenzene and total xylenes were detected in <br /> the sample from B8 at concentrations of 1.2 µg/1 and 1.3 µg/1,respectively. Toluene,ethylbenzene <br /> and total xylenes were detected in the water sample collected from boring B9 at concentrations of <br /> 0.62µg/1,0.72µg/1 and 4.3 µg/1,respectively.No other analytes were detected at or above laboratory <br /> reporting limits in the grab ground water samples analyzed. <br /> ADDITIONAL SUBSURFACE INVESTIGATIONS <br /> L In October 2002,four 8.25-inch soil borings were advanced at the site,to be completed at monitoring <br /> wells MW-7 through MW-10. Soil samples were collected from monitoring well pilot borings at <br /> i five-foot intervals,beginning at 5 feet bsg. <br /> L Borings MW7 through MW 10 were completed as ground water monitoring wells to further assess <br /> the downgradient lateral and vertical extent of impacted soil and ground water.A total of eight soil <br /> samples were collected and analyzed for TPH-g, BTEX, EDB, 1,2-DCA and the suite of five fuel <br /> additives,including MTBE.No analytes were detected at or above laboratory reporting limits in the <br /> soil sample analysis. <br /> LIn March 2004,two 8.25-inch soil borings were advanced at the site,to be completed at monitoring <br /> wells MW-11 and MW-12. Soil samples were collected from monitoring well pilot borings at <br /> five-foot intervals,beginning at 15 feet bsg. <br /> Borings MW 11 and MW 12 were completed as ground water monitoring wells to further assess the <br /> downgradient lateral extent of impacted ground water.A total of four soil samples were collected <br /> and analyzed for TPH-g and BTEX.No analytes were detected at or above laboratory reporting limits <br /> in the soil sample analysis. <br /> SITE STRATIGRAPHY <br /> A mottled,pale brown and red-brown,stiff,clayey silt/silty clay was encountered from surface grade <br /> to depths of approximately 5 feet bsg in each boring.A pale to dark gray-green,silty,medium dense, <br /> L poorly sorted fine sand was generally encountered from 5 feet to 10 feet bsg.A pale brown to pale <br /> gray, stiff, silty clay was encountered from 10 feet to 20 feet bsg. A pale brown, medium dense, <br /> poorly sorted, silty fine sand was generally encountered at depths between 20 feet and 25 feet bsg. <br /> A dark brown,very stiff, silty clay was encountered at depths greater than 25 feet bsg. <br /> Admwed GeoEnv€ronmeotol,Inc. <br /> L <br />