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Appendix C: Previous Environmental Activities an exploratory trench to remove the contents of the former burn pit and further evaluate the chemical contamination identified in the earlier investigations. The burn pit had been primarily used for the disposal of unconsolidated incinerated debris and garbage. The trench was advanced to 19 feet bgs in the area on the north side of the former container fabrication plant, and one soil sample was collected at 14 feet bgs. TPH quantified as motor oil (TPHmo), TPH quantified as diesel(TPHd), BTEX, and TCE were detected in this sample. TPHd and TPHmo were detected at concentrations of 8,600 and 3,400 mg/kg, respectively. Approximately 29.86 tons of soil were removed from the waste/bum pit and disposed of at the Class I hazardous waste facility located in Kettleman City, California. WHF recommended that the extent of soil and any groundwater affected by releases from the wasteibum pit be investigated. On March 6, 1996, WHF advanced six hand-auger borings (RB-1 through RB-6)to 2.5 feet bgs in the vicinity of the waste/bum pit area, and collected soil samples for analysis. According to WHF, the laboratory test results"showed no evidence of contamination except for TPHmo in RB-1, RB-2, RB-3, and RB-5,"ranging from 50 to 80 mg/kg. GEOLOGICAL TECHNICS, INC. (GEOLOGICAL TECHNICS) 1996 SITE INVESTIGATION In 1996 Geological Technics was contracted by Hunter Container to investigate a potential TCE and/or volatile organic compounds(VOCs)release from a condensate outlet pipe along the northeast side of the former container fabrication plant. Geological Technics advanced four soil borings, one of which was converted to monitoring well MW-1. Soil samples were collected from depths ranging from 6 to 31 feet bgs. Ethylbenzene, xylenes, TPHg, TPHd, and TPHmo were detected in the majority of the samples. Geological Technics collected groundwater samples from MW-1 at approximately 30 feet bgs and submitted the samples for analysis. TPHg and TPHd concentrations detected in groundwater were 61,000 and 3,000 micrograms per liter(gg/L),respectively. During the borehole drilling for well MW-1 "third phase product [was] floating on the water table." Additionally,petroleum hydrocarbons were detected in a water sample collected from the septic tank located on the site; however, Geological Technics indicated that these chemicals were associated with the disposal of petroleum waste or mop water into the septic tank during a one- time event. Geological Technics concluded that two overlapping plumes were present on the site: (1) a TCE plume caused by a surface release of cleaning solutions years ago by Hunter Container, and(2) a petroleum-hydrocarbon plume sourced from one or both of the two petroleum pipelines located approximately 34 feet northeast of the Hunter Container building, and owned by Southern Pacific Pipeline Company and Chevron. Geological Technics recommended that"San Joaquin County and RWQCB work with the two pipeline companies to address the petroleum hydrocarbon issue." 4. Geological Technics,Inc., 1996. Report,Soil and Groundwater Investigation,Hunter Container,35275 Welty Road, Vernalis, California. October. C-2 The Benham Companies.LLC A Wl+olly OwneE SuMd�azy From S*nce to souk-1