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APPENDIX C:
<br /> PREVIOUS ENVIRONMENTAL ACTIVITIES
<br /> US Can—Welty Road(the site) emerged after several environmental investigations unrelated to
<br /> the Historic Pipeline Portfolio—Bakersfield to Richmond(HPP-BTR)were performed in 1995
<br /> and 1996 at the Hunter Container Corporation(Hunter Container)property located at
<br /> 35275 Welty Road in Vernalis, California(Figure 1). In the process of investigating a former
<br /> burn pit and a release from a condensate outlet,petroleum hydrocarbons were encountered in soil
<br /> and groundwater on the Hunter Container property in the vicinity of the former HPP-BTR
<br /> pipelines. As a result, in 1997 Chevron Pipeline Company(CPL) initiated investigation of the
<br /> former HPP-BTR pipelines in the area near the Hunter Container property. This HPP-BTR
<br /> investigation area is known as the US Can—Welty Road site,which is the subject of the previous
<br /> environmental activities. Activities leading to the discovery of HPP-BTR related affected soil
<br /> and groundwater, and subsequent investigations, are described below in chronological order.
<br /> Sample locations can be found on Figure 2. Information on other properties in proximity to the
<br /> site is also included.
<br /> ENVIRONMENTAL RESOURCES MANAGEMENT—WEST, INC. (ERM—WEST)
<br /> 1995 SITE INVESTIGATIONS'
<br /> On March 30, 1995, ERM-West performed soil sampling at the Hunter Container facility in
<br /> Vernalis, California, to evaluate areas of potential environmental concern. ERM-West collected
<br /> 11 surface soil samples(S-1 through S-11)near the wash-water discharge area, gasoline storage-
<br /> tank removal area, chemical storage shed, condensate-line outlet, septic tank,compressor
<br /> building, and outdoor equipment-storage area(i.e.,west of the can fabrication plant waste/bum
<br /> pit area). Total petroleum hydrocarbons(TPH) quantified as oil and grease (TPHog)were
<br /> detected in four soil samples (S-4, S-5, S-6, and S-8) at concentrations ranging from
<br /> 1,500 milligrams per kilogram(mg/kg) to 5,200 mg/kg. TPH quantified as gasoline(TPHg)
<br /> were detected in two of the soil samples (S-4 and S-5) at concentrations of 20 and 6,000 mg/kg,
<br /> respectively. The report documenting these activities also stated that a 1,000-gallon, gasoline
<br /> underground storage tank(UST) was removed from the Hunter Container site in 1988; no further
<br /> details about the tank removal were provided.
<br /> On May 9, 1995, ERM-West advanced four hand-auger borings (HB-3, HB-4, HB-5, and HB-6)
<br /> to 10 feet below ground surface (bgs)to establish the lateral and vertical extent of affected soil
<br /> near the northeastern side of the former can fabrication plant. Affected soil was identified in
<br /> HB-3, HB-4, and HB-6. Benzene, toluene, ethylbenzene, and total xylenes (BTEX), and
<br /> trichloroethylene(TCE)were the main compounds detected in the soil samples.
<br /> WHF,INC. ENVIRONMENTAL AND ENGINEERING GROUP (WHF) 1996 SITE
<br /> INVESTIGATIONS"'
<br /> In late 1995 or early 1996, the Hunter Container property was leased to the U.S. Can Company
<br /> (US Can). On November 29, 1995,WHF, in conjunction with its contractor SEMCO, excavated
<br /> 1. ERM-West, 1995. Site Investigations at the Hunter Container Facility,Vernalis,California. March and May.
<br /> 2. WHF,Inc., 1996. U.S.Can Company,35275 Hwy.33, Vernalis, California,Preliminary Site Characterization Report of
<br /> Findings. January.
<br /> 3. WHF,Inc., 1996. Hunter Container Corporation,35275 Hwy.33, Vernalis,California,Phase I Site Characterization,
<br /> Waste/Burn Pit&Surrounding Area. April.
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