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APPENDIX B:
<br /> PREVIOUS ENVIRONMENTAL INVESTIGATIONS
<br /> ROBERTS PROPERTY/BELLINI PROPERTY
<br /> Geological Technics, Inc. (Geological Technics) 1995 Site Investigation'
<br /> Geological Technics performed a Preliminary Environmental Site Assessment that included a
<br /> review of public records and aerial photographs, a site reconnaissance,personal interviews, and a
<br /> subsurface investigation. Osterberg and Stewart, Inc., under the supervision of Geological
<br /> Technics, advanced soil borings SB-1 and SB-2 on January 20, 1995. Total extractable
<br /> petroleum hydrocarbons were detected in soil samples collected from SB-2 at concentrations
<br /> ranging from 11,800 milligrams per kilogram(mg/kg) to 17,200 mg/kg. Total recoverable
<br /> petroleum hydrocarbons were also detected in the soil sample collected from SB-2 at a
<br /> concentration of 17,600 mg/kg. Benzene, toluene, ethylbenzene, and xylenes (BTEX)were not
<br /> detected at or above the laboratory reporting limits.
<br /> Radian International, LLC (Radian) 1998 Site Investigation
<br /> In July 1998, Gregg Drilling and Testing, Inc., under the supervision of Radian, advanced six
<br /> soil borings (SB-3 through SB-8) and installed four groundwater monitoring wells (MW-1
<br /> through MW-4). Total petroleum hydrocarbons quantified as diesel (TPHd) and as motor oil
<br /> (TPHmo) were detected in soil samples collected from SB-3 through SB-8, MW-1, and MW-2.
<br /> Maximum concentrations of TPHd and TPHmo were 9,800 mg/kg and 9,000 mg/kg,
<br /> respectively. TPH quantified as gasoline (TPHg) were detected in SB-8, MW-1, and MW-2,
<br /> with a maximum concentration of 270 mg/kg. BTEX compounds were detected in soil at
<br /> maximum concentrations of 0.05, 4.9, 2.2, and 8.4 mg/kg, respectively.
<br /> TPHd concentrations were also present in groundwater samples collected from MW-2 through
<br /> MW-4, with a maximum concentration of 230 micrograms per liter(gg/L) in MW-2.
<br /> Approximately 6 inches of separate-phase oil were present in MW-1; therefore, groundwater
<br /> from this well was not sampled.
<br /> Geomatrix Consultants,Inc. (Geomatrix) 1998 Sampling Event
<br /> Monitoring wells MW-2, MW-3, and MW-4 were sampled by Geomatrix in November 1998.
<br /> TPHd were not detected in any of the samples.
<br /> Geomatrix 2002 Site Investigation
<br /> Geomatrix supervised the installation of temporary soil borings SB-9 through SB-14 in May
<br /> 2002. TPH quantified as crude oil (TPHc)were detected in soil samples collected from SB-9,
<br /> SB-10, and SB-14; the maximum concentration was 27,000 mg/kg. Polynuclear aromatic
<br /> hydrocarbons (PAHs) were also detected in soil samples collected from SB-9, SB-10, and
<br /> 1. Geological Technics, 1995. Preliminary Environmental Site Assessment: Vernalis Property, 35500 Welty Road, Vernalis,
<br /> California. February.
<br /> 2. Radian, 1998. Preliminary Site Investigation Work Plan:Roberts Property. July.
<br /> 3. Geomatrix, 1999. Site Investigation Report and Screening-Level Health Risk Assessment,Roberts Property(Former Vernalis
<br /> Pump Station), Vernalis, California. February.
<br /> 4. Geomatrix,2002. Report of Soil and Groundwater Investigation,Former Vernalis Pump Station, Vernalis, California.
<br /> August.
<br /> B-1 �� The Benham Companies,LLC
<br /> A Wholly Owned Subsidiary
<br /> From ScAme ro SolarAm
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