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Mr.M. Scott Mansholt-CEMC
<br /> Fourth Quarter 2006 Groundwater Monitoring and Sampling Report and
<br /> Annual Summary Report January 12,2007
<br /> US Can-Welty Road Page 3 of 8
<br /> WHF,Inc. (WHF) and SEMCO excavated an exploratory trench to 19 feet bgs (near the
<br /> northeastern side of the can fabrication plant)and collected one soil sample at 14 feet bgs. Total
<br /> petroleum hydrocarbons quantified as diesel-range organics(TPHd), TPH quantified as motor oil
<br /> (TPHmo),BTEX, and TCE were detected in this sample. Concentrations of TPHd and TPHmo
<br /> were 8,600 mg/kg and 3,400 mg/kg,respectively. The contents of the wasteibum pit were also
<br /> removed.
<br /> 1996 Site Investigations4,5 On March 6, 1996,WHF advanced six hand borings(RB-1 through
<br /> RB-6)to 2.5 feet bgs in the vicinity of the waste/burn pit area. TPHmo were detected in four soil
<br /> samples(RB-1, RB-2,RB-3, and RB-5)at concentrations ranging from 50 mg/kg to 80 mg/kg.
<br /> Three soil borings(SB-1, SB-2, and SB-3)and one monitoring well(MW-1)were installed by
<br /> Geological Technics in the vicinity of the former condensate pipe outlet. TPH quantified as
<br /> gasoline-range organics(TPHg), TPHd,and TPHmo were detected in the majority of the soil
<br /> samples at concentrations ranging from less than 1 to 11,300 mg/kg.
<br /> 1997 Site Investigation 6 On February 27, 1997,three cone penetration test(CPT)borings
<br /> (CPT-1, CPT-2, and CPT-3)were advanced by Gregg Drilling and Testing,Inc. (Gregg Drilling)
<br /> under the supervision of Radian International,LLC(Radian). Groundwater samples were
<br /> collected during this investigation in order to determine if TCE had affected the groundwater.
<br /> Groundwater samples were collected at 35 and 50 feet bgs. No TCE was detected in any of the
<br /> samples. Cis-1-2-dichloroethene (C-1-2-DCE), a degradation product of TCE,was detected in
<br /> one of the groundwater samples analyzed.
<br /> 1998 Site Investigation. On July 15,22, and 23, 1998, six soil borings(B-1 through B-6)and
<br /> three monitoring wells (MW-2,MW-3, and MW-4)were installed at the site by Radian.
<br /> Concentrations exceeding 100 mg/kg of TPHg, TPHd,and TPHmo were detected in borings B-1,
<br /> B-4,B-5, B-6, and well boring MW-2. Concentrations were detected up to 21,000 mg/kg in these
<br /> samples.
<br /> 1999 Site Investigation.' On November 9 and 11, 1999, Gregg Drilling,under the supervision of
<br /> Geomatrix Consultants,Inc. (Geomatrix), advanced seven soil borings(GMX-1 through GMX-7)
<br /> for soil and groundwater samples. TPH quantified as crude oil(TPHc)were detected at a
<br /> concentration of 10,000 mg/kg in one soil sample collected at 37 feet bgs from GMX-3. TPHg
<br /> and TPHd were detected in a groundwater sample from GMX-6 at concentrations of
<br /> 110 micrograms per liter(µg/L)and 92 gg/L,respectively.
<br /> 2002 Site Investigation! On May 20 and 21,2002,Gregg Drilling,under the supervision of
<br /> Geomatrix, advanced three soil borings (GMX-8, GMX-9, and GMX-1B)for additional soil
<br /> samples. TPHc were detected in borings GMX-8 and GMX-113 at maximum concentrations of
<br /> 8,000 mg/kg and 5,100 mg/kg,respectively.
<br /> 4. WFS,Inc., 1996. Preliminary Site Characterization,Report of Findings, US Can Company, 35275 Hwy.33,
<br /> Vernalis, California.
<br /> 5. WFS,Inc., 1996. Phase I-Site Characterization, Waste/Burn Pit&Surrounding Area,Hunter Container
<br /> Corporation, 35275 Hwy. 33, Vernalis, California.
<br /> 6. Radian International,LLC, 1997. 27 February 1997 Groundwater Sampling at 35275 Welty Road, Vernalis,
<br /> California. March.
<br /> 7. Geomatrix Consultants,Inc.,2000. Soil and Groundwater Investigation Report,35275 Welty Road-APN 255-
<br /> 180-09, Vernalis, California.
<br /> 8. Geomatrix Consultants,Inc.,2002. Report of Soil and Groundwater Investigation, US Can/Welty Road, Vernalis,
<br /> California.
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