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' Soil and Groundwater Investigation Report
<br /> Vernalis Offsite June 2008
<br /> 2.5 PREVIOUS ENVIRONMENTAL ACTIVITIES
<br /> Vernalis Pump Station
<br /> Bellini Property
<br /> ' Preliminary Environmental Site Assessment(Geological Technics, 1995). Geological Technics
<br /> performed a Preliminary Environmental Site Assessment that included a review of public records and
<br /> aerial photographs, a site reconnaissance,personal interviews, and a subsurface investigation. On January
<br /> 20, 1995, Osterberg and Stewart,Inc.,under the supervision of Geological Technics,drilled soil borings
<br /> SB-1 and SB-2. Total extractable petroleum hydrocarbons were detected in soil samples collected from
<br /> SB-2 at concentrations ranging from 11,800 milligrams per kilogram(mg/kg)to 17,200 mg/kg. Total
<br /> recoverable petroleum hydrocarbons were also detected in the soil sample collected from SB-2 at a
<br /> concentration of 17,600 mg/kg.
<br /> Preliminary Site Investigation Work Plan: Roberts Property (Radian International,LLC [Radian],
<br /> 1998 . Gregg Drilling and Testing,Inc. (Gregg Drilling),under the supervision of Radian,advanced six
<br /> soil borings (SB-3 through SB-8) and four groundwater monitoring wells (MW-1 through MW-4)in July
<br /> of 1998. TPH quantified as diesel(TPHd) and TPH quantified as motor oil(TPHmo) were detected in
<br /> ' soil samples from SB-3 through SB-8,MW-1, and MW-2. Maximum concentrations of TPHd and
<br /> TPHmo were 9,800 mg/kg and 9,000 mg/kg, respectively, in boring SB-8. TPH quantified as gasoline
<br /> (TPHg) were detected in SB-8,MW-1,and MW-2, with a maximum concentration of 270 mg/kg in SB-8.
<br /> ' TPHd concentrations were also present in groundwater samples collected from MW-2 through MW-4,
<br /> with a maximum concentration of 230 micrograms per liter(µg/L)in MW-2. Approximately 6 inches of
<br /> separate-phase hydrocarbons (SPH) were present in MW-1;therefore, groundwater from this well was not
<br /> sampled.
<br /> Site Investigation Report and Screening-Level Health Risk Assessment(Geomatrix, 1999).
<br /> Monitoring wells MW-1, MW-2,MW3, and MW-4 were sampled by Geomatrix in November 1998.
<br /> ' TPHd were not detected in any of the samples.
<br /> Report of Soil and Groundwater Investigation(Geomatrix,2002). Geomatrix supervised the
<br /> advancement of soil borings SB-9 through SB-14 in May of 2002. TPH quantified as crude oil (TPHc)
<br /> were detected in soil samples collected from SB-9, SB-10, and SB-14;the maximum concentration was
<br /> 27,000 mg/kg. PAHs were also detected in soil samples collected from SB-9, SB-10, and SB-14;
<br /> however,PAH levels were all below PRGs. BTEX constituents were detected in borings SB-9 through
<br /> iSB-14,but no concentration exceeded a PRG.
<br /> Groundwater samples were collected from monitoring wells MW-2,MW-3, and MW-4, and from boring
<br /> ' SB-13 and submitted to a laboratory for chemical analysis. Laboratory results for the samples were
<br /> below laboratory detection limits for the COCs. The TPHd concentration detected in groundwater was
<br /> 540µg/L from SB-13. Ethylbenzene in SB-13 was reported at 0.8 µg/1.,, which is significantly less than
<br /> the applicable WQO of 29 µg/L.
<br /> Report of Soil and Groundwater Investigations(Geomatrix,2004). Geomatrix supervised the
<br /> advancement of soil borings SB-15 through SB-21 in August of 2003, on and adjacent to the Bellini
<br /> property. TPHc were detected in all borings except SB-18. The maximum TPHc concentration detected
<br /> was 39,000 mg/kg. Benzene,ethylbenzene, and PAHs were detected in soil; however,no concentration
<br /> exceeded a PRG.
<br /> Geomatrix also collected grab groundwater samples from borings SB-15, SB-17, SB-18,and SB-21.
<br /> TPHg and BTEX were not detected in any of the groundwater samples. TPHd were detected, with each
<br /> concentration exceeding the WQO of 100 µg/L.
<br /> ' Groundwater Monitoring and Sampling Reports,(SAIL 2005—2008). SAIC performed groundwater
<br /> monitoring, sampling, and reporting between 2005 and 2008.
<br /> 3 '—
<br /> From Science to Solutions
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