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E E Site Background Information: Five Star Marina Page 4 of 4 PREVIOUS SITE INVESTIGATION On 01 and 05 December 1997, a total of ten soil probe boring (P16 to P25) were established surrounding'the East UST area. TPH-g and BTEX were reported in soil samples collected from the probe borings at concentrations as high as 2,100 mg/kg and 14 ri /kg (xylenes), respectively. Y• Hydrocarbon-impacted soil associated with the East UST arealappea.red to be limited to the former dispenser area(southern edge of Lindsay Street), and to a depth of 16 feet to 17 feet bsg, in the saturated soil below the:ground water table. TPH-g was reported in six of eleven grab groundwater samples collected from the East UST area at concentrations ranging from 53 pg/1 to 100,000 pg/l. BTEX was reported in eight of eleven samples analyzed at concentrations ranging from 0.55 µg/l to,1,700'µg/1: On 15 and 16 April 2008, four ground water monitoring wells MW-10 through MW-13 were installed on-site to assess the vertical and lateral extent of contamination near the-former eastern UST location.. MW10 through MW13 were completed as ground water monitoring wells using 2-inch diameter polyvinylchloride (PVC) casing with a 0.020-inch slotted screen installed from 5 feet to 20 feet bsg(MW-10 through MW712) and 28 feet to 33'feet bsg (MW-13). Soil samples collected from MW 10 at 20 feet bsg(MW-10-20)and from boring MW 13(MW-13-30) at 30 feet bsg reported TPH-g at concentrations of 2.4 milligrams per kilogram (mg/kg) and 2.8 mg/kg, respectively. Ground water samples collected during well development from wells MW-10 and MW-13 at concentrations of 3,200 micrograms per liter(µg/1)and 5,100 pg/1,respectively.One or more BTEX compounds were reported in wells MW-10 and MW-13 at maximum concentrations of 15 pg/1 benzene, 3.1 pg/l toluene, 73 µg/l ethylbenzene, and 60 µg/l total xylenes in well MW-13; TAME was reported at 10 µg/l in well MW-13. Advanced GcoEnvironmental,Inc.