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' APPENDIX B:
<br /> PREVIOUS ENVIRONMENTAL ACTIVITIES
<br /> The US Can—Welty Road site emerged after several non-HPP related environmental
<br /> investigations were performed in 1995 and 1996 at the Hunter Container Corporation (Hunter
<br /> Container) property located at 35275 Welty Road. In the process of investigating a former burn
<br /> pit and a release from a condensate outlet, petroleum hydrocarbons were encountered in soil and
<br /> groundwater on the Hunter Container property in the vicinity of the former HPP pipelines. As a
<br /> result, in 1997 Chevron Pipeline Company (CPL) initiated investigation of the former HPP
<br /> pipelines in the area near the Hunter Container property. This HPP investigation area is known
<br /> as the US Can—Welty Road site, which is the subject of the previous environmental activities.
<br /> Activities leading to the discovery of HPP pipeline-related affected soil and groundwater, and
<br /> ' subsequent investigations, are described below in chronological order. Information on other
<br /> properties in proximity to the 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 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 quantified as oil and grease (TPHog) were detected in
<br /> four soil samples (S-4, S-5, S-6, and S-8) at concentrations ranging from 1,500 milligrams per
<br /> kilogram (mg/kg) to 5,200 mg/kg. TPH quantified as gasoline (TPHg) were detected in two of
<br /> the soil samples (S-4 and S-5) at concentrations of 20 and 6,000 mg/kg. The report documenting
<br /> these activities also stated that a 1,000-gallon, gasoline underground storage tank (UST) was
<br /> removed from the Hunter Container site in 1988; no further details about the tank removal were
<br /> 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, 1113-4, 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. (WHF) 1996 SITE INVESTIGATIONS2,3
<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 /> an exploratory trench to remove the contents of the former burn pit and further evaluate the
<br /> chemical contamination identified in the earlier investigations. The burn pit had been primarily
<br /> used for the disposal of unconsolidated incinerated debris and garbage. The trench was
<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 1 Site Characterization,
<br /> Waste/Burn Pit&Surrounding Area. April.
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