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Soil and Groundwater Investigation Report and
<br /> ` Second Quarter 2005 Monitoring and Sampling, US Can-Welty Road October 2005
<br /> petroleum hydrocarbons as diesel (TPHd),TPH as motor oil (TPHmo), BTEX, and TCE were
<br /> detected in this sample. Concentrations of TPHd and TPHmo were 8,600 mg/kg and 3,400
<br /> mg/kg, respectively. The contents of the waste/burn pit were also removed.
<br /> 1996: March 6—WHF, Inc. advanced six hand borings(RB-1 through RB-6)to a depth of 2.5 feet bgs
<br /> .. in the vicinity of the waste/burn pit area. TPHmo was detected in four soil samples(RB-1, RB-2,
<br /> RB-3, and RB-5). Concentrations of TPHmo ranged from 50 mg/kg to 80 mg/kg.
<br /> September 30—Three soil borings(SB-1, SB-2, and SB-3)and one monitoring well (MW-1)
<br /> were installed by Geological Technics in the vicinity of the former condensate pipe outlet. TPH
<br /> as gasoline(TPHg), TPHd,and TPHmo were detected in the majority of the soil samples.
<br /> Concentrations ranged from <1 mg/kg to 11,300 mg/kg.
<br /> 1997: February 27—Three cone penetration test(CPT) borings (CPT-1, CPT-2, and CPT-3) were
<br /> advanced by Gregg Drilling under the supervision of Radian International (Radian).
<br /> Groundwater samples were collected during this investigation in order to determine if TCE had
<br /> impacted groundwater. Groundwater samples were collected at depths of 35 feet and 50 feet bgs.
<br /> No TCE was detected in any of the samples. Cis-1-2-dichloroethene(C-1-2-13CE), a degradation
<br /> product of TCE, was detected in one of the groundwater samples analyzed.
<br /> ` 1998: July 15,22,and 23—Six soil borings(B-1 through B-6) and three monitoring wells(MW-2,
<br /> MW-3, and MW-4)were installed at the site by Radian. Concentrations exceeding 100 mg/kg of
<br /> TPHg, TPHd, and TPHmo were detected in borings B-1, B-4, B-5, B-6, and well boring MW-2.
<br /> Concentrations were detected up to 21,000 mg/kg in these samples.
<br /> 1999: November 9 and 11 —Gregg Drilling, under the supervision of Geomatrix, advanced seven soil
<br /> borings(GMX-1 through GMX-7) for soil and groundwater samples. TPH as crude oil (TPHc)
<br /> were detected at a concentration of 10,000 mg/kg in one soil sample collected at 37 feet bgs from
<br /> GMX-3. TPHg and TPHd were detected in groundwater sample GMX-6 at concentrations of 110
<br /> micrograms per liter(µg/L) and 92 µg/L, respectively.
<br /> 2002: May 20 and 21 —Gregg Drilling, under the supervision of Geomatrix, advanced three soil borings
<br /> (GMX-8, GMX-9, and GMX-I B) for additional soil samples. TPHc were detected in borings
<br /> GMX-8 and GMX-1 B at maximum concentrations of 8,000 mg/kg and 5,100 mplkg, respectively.
<br /> 2003: August 4 and 5—Gregg Drilling, under the supervision of Geomatrix, advanced three soil borings
<br /> (GMX-10, GMX-1 ], and GMX-12) for soil and groundwater samples. TPHc were detected in
<br /> ` the soil sample collected at 41.5 feet bgs from boring GMX-12 at concentration of 15,000 mg/kg.
<br /> TPHd were detected in all groundwater samples collected from GMX-10, GMX-11, and GMX-12
<br /> at concentrations of 210 µg/L, 3,600 µg/L, and 110 Itg/L, respectively.
<br /> Based on the previous soil and groundwater investigations, petroleum-affected soil northeast of GMX-12
<br /> has not been laterally defined off site. Furthermore, groundwater appears to be affected in the vicinity of
<br /> borings GMX-10, GMX-11, and GMX-12 and has not been laterally defined down gradient of the subject
<br /> ., site. Groundwater beneath the site has been encountered between approximately 25 and 39 feet bgs.
<br /> Based on the data from previous reports, groundwater flow beneath the site varies from the northeast to
<br /> southeast. A site map with historical boring locations is presented as Figure 2. Historical soil and
<br /> groundwater analytical results are included in Appendix B.
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<br /> ` 3 From Science to Sotut ow-
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