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Site Background Information: Quick N Save #1 Page 3 of 6 and 1 ,420mg/kg of benzene, toluene, ethylbenzene, and xylenes, respectively in boring B1 -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 I , 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. Pilot borings MW 1 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) (MW140), 2.9 mg/kg (MW245), 5 .7 mg/kg (MW345) and 2.7 mg/kg (MW440), respectively. At least one of the BTEX constituents were detected in soil samples collected from borings MW 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 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 ofhydrocarbon-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 . TPH-g was detected in all analyzed samples from EW- 1 at concentrations between 12 milligrams Advanced GeoEnvironmental, Inc.