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k � � M Site Background Information: Quick N Save # 1 Page 3 of 5 and 1 ,420mg/kg of benzene, toluene, ethylbenzene, and xylenes, respectively in boring 131 -35'. MONITORING WELL INSTALLATION On 17 and 18 March 2004, four soil borings (MW 1 through MW4) were advanced at the site. 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 hydrocarbon stained, slightly moist, clay was encountered from approximately 26 feet to 36 feet bsg in MW 1 , MW2 and MW3 and from 20 to 24 feet bsg in the area of MW4 . Gray hydrocarbon stained, moist to saturated silty sandwas 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. Pilot borings MW l through MW4 were completed as 2" diameter ground water monitoring wells. TPH-g was detected in soil samples collected from borings MWl through MW4 at maximum concentrations in each boring of 1 .2 milligrams per kilogram (mg/kg) (MWl -40), 2 . 9 mg/kg (MW245), 5 .7 mg/kg (MW345) and 2.7 mg/kg (MW440), respectively. At least one ofthe BTEX constituents were detected in soil samples collected from borings MW I through MW4 at maximum concentrations of 0 .44 mg/kg (benzene), 0.072 mg/kg (toluene), 0 . 12 mg/kg (ethylbenzene) and 0 .20 mg/kg (xylenes), respectively. MTBE was detected 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. SOIL VAPOR AND GROUND WATER EXTRACTION WELL INSTALLATION On 16 and 17 August 2005 , four vapor extraction wells (VW-1 through VW-4) and one groundwater 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 20feetbsg. 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 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 EW-1 . Advanced GeoEnvironmental, Inc.