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<br /> Appendix B:Previous Environmental Activities
<br /> WHF INC.ENVIRONMENTAL AND ENGINEERING GROUP HF 1996 SITE
<br /> INVESTIGATIONS 1,4
<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 l
<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 /> advanced to 19 feet bgs in the area on the north side of the former container fabrication plant,
<br /> and one soil sample was collected at 14 feet bgs. TPH quantified as motor oil(TPHmo), TPH
<br /> quantified as diesel(TPHd), BTEX, and TCE were detected in this sample. TPHd and TPHmo
<br /> were detected at concentrations of 8,600 and 3,400 mg/kg,respectively. 1
<br /> Approximately 29.86 tons of soil were removed from the waste/bum pit and disposed of at the I
<br /> Class I hazardous waste facility located in Kettleman City, California. WHF recommended that
<br /> the extent of soil and any groundwater affected by releases from the waste/burn pit be
<br /> investigated.
<br /> On March 6, 1996,WHF advanced six hand-auger borings (RB-1 through RB-6)to 2.5 feet bgs
<br /> in the vicinity of the waste/bum pit area, and collected soil samples for analysis. According to I
<br /> WHF,the laboratory test results "showed no evidence of contamination except for TPHmo in
<br /> RB-1, RB-2, RB-3, and RB-5"ranging from 50 to 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 potential TCE I
<br /> and/or volatile organic compounds (VOCs)release from a condensate outlet pipe along the
<br /> northeast side of the former container fabrication plant. Geological Technics advanced four soil
<br /> borings, one of which was converted to monitoring well MW-1. Soil samples were collected at
<br /> depths ranging from 6 to 31 feet bgs. Ethylbenzene, xylenes, TPHg, TPHd, and TPHmo were
<br /> detected in the majority of the samples.
<br /> Geological Technics collected groundwater samples from MW-1 at approximately 30 feet bgs
<br /> and submitted the samples for analysis. TPHg and TPHd concentrations detected in groundwater
<br /> were 61,000 and 3,000 micrograms per liter(µg/L), respectively. During the borehole drilling
<br /> for well MW-1 "third phase product [was] floating on the water table."
<br /> Additionally, petroleum hydrocarbons were detected in a water sample collected from the septic
<br /> tank located on the Site; however, Geological Technics indicated that these chemicals were
<br /> associated with the disposal of petroleum waste or mop water into the septic tank during a one-
<br /> time event.
<br /> Geological Technics concluded that two overlapping plumes were present on the Site: (1) a TCE
<br /> plume caused by a surface release of cleaning solutions years ago by Hunter Container, and(2) a
<br /> 3. wYIF,Inc., 1996. U.S. Can Company,35275 Hwy.33, Vernalis, California,Preliminary Site Characterization Report of
<br /> Findings. January.
<br /> 4. w1IF,Inc.,1996. Hunter Container Corporation,35275 Hwy.33, Vernalis, California,Phase I Site Characterization,
<br /> Waste/Burn Pit&Surrounding Area. April,
<br /> 5. Geological Technics,Inc., 1996. Report,Soil and Groundwater Investigation,Hunter Container,35275 Welty Road,
<br /> Vernalis, California. October.
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