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Site Background Information : Quick N Save #1 Page 3 of 9 �I concentrations of 5 .6mg/kg (134-36) . BTEX compounds were detected at maximum concentrations of 27mg/kg , 600mg/kg , 270mg/kg , and 1 ,420mg/kg of benzene , toluene, ethylbenzene , and xylenes , respectively in boring B1 -35 . Monitoring Well Installations - March 2004 On 17 and 18 March 2004 , four soil borings (MW1 through MW4) were advanced at the site . Pilot borings MW1 through MW4 were completed as 2" diameter ground water monitoring wells . Generally, an orange-brown , dry, clayey silt (fill material ),was encountered from surface grade to approximately 6 feet bsg . Orange brown to brown , dry, silts and clayey silts were encountered from approximately 6 feet bsg to 26 feet bsg . Orange brown to blue grey Jhydrocarbon stained , slightly moist, clay was encountered from approximately 26 feet to 36 feet bsg in MW1 , MW2 and MW3 and from 20 to 24 feet bsg in the area of MW4 . Gray hydrocarbon stained , moist to saturated silty sand was encountered from approximately 36 feet bsg to 53 feet bsg . Saturated soil was encountered at 40 feet bsg . Blue, hydrocarbon-stained clay was encountered from approximately 53 feet bsg to 55 feet bsg . TPH-g was detected in soil samples collected from borings MW1 through MW4 at maximum concentrations in each boring of 1 .2 milligrams per kilogram (mg/kg ) (MW1 -40), 2 . 9 mg/kg (MW245 ), 5 .7 mg/kg (MW3-45 ) and 2 . 7 mg/kg (MW4-40 ), respectively. At least one of the BTEX constituents were detected in soil samples collected from borings MW1 through MW4 at maximum concentrations of 0 .44 mg/kg (benzene ), 0 . 072 mg/kg (toluene), I 0 . 12 mg/kg (ethylbenzene ) and 0 .20 mg/kg (xylenes), respectively. MTBE was detected I_J in soil samples collected from borings MW2 and MW4 at a maximum concentration of 0 . 31 mg/kg in sample MW2-35 by EPA Method 8260 . No additional analytes were detected at or above laboratory detection limits in the samples analyzed . Extraction Well Installations - August 2005 On 16 and 17 August 2005 , four vapor extraction wells (VW- 1 through VW-4 ) and one l ground water extraction well (EW-1 ) were installed at the site for performance of a ground water pumping test and SVE pilot test. Generally, orange brown , dry to moist, silt, clayey silt, and silty clay was encountered between 5 and 20 feet bsg . Layers of hydrocarbon-stained poorly graded fine to medium grained sand , or silty sand , were usually encountered at various depths between 20 and 30 feet bsg . Hydrocarbon-stained sandy silt, silt, clay, or clayey silt was encountered J between 25 and 35 feet bsg . Hydrocarbon -stained , saturated silty sand to sand (fine to coarse grained , poorly graded ) was encountered between 35 and 55 feet bsg in pilot boring Advanced GeoEnvironmental, Inc. I, �l