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<br /> Site Background Information: Thater Property(former Tucker Construction)
<br /> Page 3 of 3
<br /> • 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, isopropylbenzene, naphthalene, n-
<br /> butylbenzene, n-propylbenzene, p-isopropyltoluene, sec-butylbenzene, and tert-
<br /> butylbenzene.
<br /> BTEX was detected at concentrations of 49 gg/l benzene, 540 gg/l toluene,590 gg/l ethylbenzene,
<br /> and 2,300 µg/1 xylenes.
<br /> 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene,isopropylbenzene, naphthalene, n-propylbenzene,
<br /> p-isopropyltoluene, and sec-butylbenzene were detected at concentrations of 520 µg/1, 400 gg/l,
<br /> 34 jig/I, 180 jig/I, 85 gg/1, 13 gg/1, and 390 gg/l, respectively.
<br /> On 18 and 19 April 2005,three additional ground water monitoring wells (MW-2 through MW-4)
<br /> were installed at the site. Pilot borings MW-2 through MW4 were completed as ground water
<br /> monitoring wells of the same designations using 2-inch diameter, Schedule 40 polyvinylchloride
<br /> (PVC)casing with a 0.020-inch slotted screen installed from 45 feet to 65 feet bsg.A total of sixteen
<br /> soil samples were analyzed for petroleum hydrocarbon constituents; no analytes were detected at
<br /> or above laboratory detection limits.
<br /> STRATIGRAPHY
<br /> Generally, fine-grained, gray-brown, damp, silty sand was encountered in boring MW-1 from
<br /> surface grade to 5 feet bsg. From 10 feet to 30 feet bsg, fine- to medium-grained, blue-gray to
<br /> yellow-brown,moist micaceous sand was identified.From 35 feet to 40 feet bsg,weakly cemented,
<br /> very fine grained,gray-green,moist micaceous silty sand was encountered. From 45 feet to 60 feet
<br /> bsg, orange-gray, green-gray, and red-brown micaceous silty sand was encountered. This material
<br /> was moist, with grain size coarsening with depth from very fine-grained to medium-grained. At
<br /> 65 feet bsg, orange-gray, clayey sand with grain sizes ranging from medium to coarse was
<br /> encountered.
<br /> To date,the lateral extent of petroleum hydrocarbon contamination in ground water is defined to the
<br /> north by well MW-4, to the south by well MW-2, and to the southeast by well MW-3.
<br /> Advanced GeoEnvironmental,Inc.
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