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Attachment A:Previous Environmental Activities
<br /> WHF,INC. ENVIRONMENTAL AND ENGINEERING GROUP (WHF) 1996
<br /> SITE INVESTIGATIONS3,4
<br /> In late 1995 or early 1996,the Hunter Container property was leased to the U.S. Can
<br /> Company(US Can). On November 29, 1995, WHF, in conjunction with its contractor
<br /> SEMCO, excavated an exploratory trench to remove the contents of the former burn pit
<br /> and further evaluate the chemical contamination identified in the earlier investigations.
<br /> The burn pit had been primarily used for the disposal of unconsolidated incinerated
<br /> debris and garbage. The trench was advanced to 19 feet bgs in the area on the north side
<br /> of the former container fabrication plant, and one soil sample was collected at 14 feet
<br /> bgs. TPH quantified as motor oil (TPHmo),TPH quantified as diesel (TPHd), BTEX,
<br /> and TCE were detected in this sample. TPHd and TPHmo were detected at
<br /> concentrations of 8,600 and 3,400 mg/kg, respectively.
<br /> Approximately 29.86 tons of soil were removed from the waste/bum pit and disposed of
<br /> at the Class I hazardous waste facility located in Kettleman City, California. WHF
<br /> recommended that the extent of soil and any groundwater affected by releases from the
<br /> waste/burn pit be investigated.
<br /> On March 6, 1996, WHF advanced six hand-auger borings (RB-1 through RB-6)to
<br /> 2.5 feet bgs in the vicinity of the waste/burn pit area, and collected soil samples for
<br /> analysis. According to WHF,the laboratory test results"showed no evidence of
<br /> contamination except for TPHmo in RB-1, RB-2, RB-3, and RB-5" ranging from 50 to
<br /> 80 mg/kg.
<br /> GEOLOGICAL TECHNICS, INC. (GEOLOGICAL TECHNICS) 1996 SITE
<br /> INVESTIGATIONS
<br /> In 1996, Geological Technics was contracted by Hunter Container to investigate a
<br /> potential TCE and/or volatile organic compounds (VOCs)release from a condensate
<br /> outlet pipe along the northeast side of the former container fabrication plant. Geological
<br /> Technics advanced four soil borings, one of which was converted to monitoring well
<br /> MW-1. Soil samples were collected at depths ranging from 6 to 31 feet bgs.
<br /> Ethylbenzene, xylenes, TPHg, TPHd, and TPHmo were detected in the majority of the
<br /> samples.
<br /> Geological Technics collected groundwater samples from MW-1 at approximately 30 feet
<br /> bgs and submitted the samples for analysis. TPHg and TPHd concentrations detected in
<br /> groundwater were 61,000 and 3,000 micrograms per liter(ggfl, respectively. During
<br /> the borehole drilling for well MW-1 "third phase product [was] floating on the water
<br /> table."
<br /> Additionally,petroleum hydrocarbons were detected in a water sample collected from the
<br /> septic tank located on the Site; however, Geological Technics indicated that these
<br /> 3. WHF,Inc., 1996. U.S.Can Company,35275 Hwy.33, Vernalis,California,Preliminary Site Characterization
<br /> Report of-Findings. January.
<br /> 4. WHF,Inc., 1996. Hunter Container Corporation,35275 Hwy.33, Vernalis, California,Phase I Site
<br /> Characterization, Waste/Burn Pit&Surrounding Area. April.
<br /> 5. Geological Technics,Inc., 1996. Report,Soil and Groundwater Investigation,Hunter Container,35275 Welty
<br /> Road, Vernalis,California. October.
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