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ChevronTexaco—Vernalis Pump Station,Vernalis,CA. Project No. 06-6102-00-6369-201
<br /> June 29,2004 Page 2 of 7
<br /> From 1902 to 1935 Standard Oil(predecessor to ChevronTexaco) operated the Vernalis Pump Station,
<br /> which was the part of former Old Valley Pipeline(OVP) system that transported heated heavy petroleum
<br /> (crude oil and Bunker C fuel oil) from San Joaquin Valley oil fields in Bakersfield to a refinery in
<br /> Richmond, California. The OVP was located along the northeastern side of the site and parallel to the
<br /> existing UPRR tracks and Highway 33. Site features included a boiler house, a pump house, a sump, an
<br /> incinerator, a rubbish pit,cottages, and three bulk storage tanks with secondary containment structures.
<br /> These surface structures were located within the Arcos property. The property located immediately
<br /> southeast of the Arcos property was a former Tidewater Associated Oil Company(TAOC) (predecessor
<br /> to Texaco and now ChevronTexaco)pump station. According to the ESA(Geological Technics,Inc.,
<br /> 1995),the former pump station was owned by Vernalis Enviropur-West in 1995,and was used for bulk
<br /> storage of petroleum and oil products.
<br /> BACKGROUND
<br /> The following information is a brief history of previous environmental investigations conducted at and in
<br /> the vicinity of the site:
<br /> BELLINI PROPERTY
<br /> 1994/5: Geological Technics,Inc.performed a Preliminary Environmental Site Assessment. The site
<br /> assessment included review of public records, aerial photographs, on-site reconnaissance,
<br /> personal interviews, and subsurface investigation. On January 20, 1995 Osterberg and Stewart
<br /> Inc.,under the supervision of Geological Technics drilled two soil borings, SB-1 and SB-2. Total
<br /> extractable petroleum hydrocarbons (TEPH)were detected in soil samples collected from SB-2 at
<br /> concentrations ranging from 11,800 milligrams per kilogram(mg/kg)to 17,200 mg/kg. In
<br /> addition,total recoverable petroleum hydrocarbons(TRPH)were detected in the soil sample
<br /> collected from SB-2 at a concentration of 17,600 mg/kg.
<br /> 1998: July—Gregg Drilling and Testing, Inc.,under the supervision of Radian International LLC,
<br /> drilled six soil borings, SB-2 through SB-8, and installed four groundwater monitoring wells,
<br /> MW-1 through MW-4. Total petroleum hydrocarbons as diesel(TPHd), and total petroleum
<br /> hydrocarbons as motor oil(TPHmo)were detected in soil samples from SB-3 through SB-8,
<br /> MW-1, and MW-2. Maximum concentrations of TPHd and TPHmo were 9,800 mg/kg and 9,000
<br /> mg/kg,respectively. Total petroleum hydrocarbons as gasoline(TPHg)were detected in SB-8,
<br /> MW-1, and MW-2, and maximum concentrations were 270 mg/kg. TPHd concentrations were
<br /> also present in groundwater samples collected from MW-2 through MW-4 at a maximum
<br /> concentration of 230 micrograms per liter(gg/L). Approximately 6 inches of separate-phase oil
<br /> (SPO)were present in MW-1;therefore,groundwater from this well was not sampled.
<br /> October and November—Geomatrix Consultants sampled groundwater from monitoring wells
<br /> MW-2 through MW-4. TPHd were not detected in any of the samples.
<br /> 2002: May—Gregg Drilling and Testing,Inc.,under the supervision of Geomatrix Consultants,
<br /> advanced six soil borings, SB-9 through SB-14. Total petroleum hydrocarbons quantified as
<br /> crude oil(TPHc)were detected in soil samples collected from SB-9, SB-10, and SB-14, and the
<br /> maximum concentration was 27,000 mg/kg. Polynuclear aromatic hydrocarbons (PAHs)were
<br /> also detected in soil samples collected from SB-9, SB-10 and SB-14, and the maximum
<br /> concentration was 7.3 mg/kg. No TPHc or PAHs were detected in soil samples from SB-11,
<br /> SB-12, or SB-13. Very low concentrations of benzene,toluene, ethylbenzene, and xylenes
<br /> (BTEX)were detected in various samples collected from borings SB-9 through SB-14.
<br /> 2003: August—Resonant Sonic International,Inc.,under the supervision of Geomatrix Consultants,
<br /> advanced seven soil borings, SB-15 through SB-21, on and around the Bellini property. TPHc
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