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' Appendix B:Previous Environmental Activities <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. <br /> Approximately 29.86 tons of soil were removed from the waste/bum pit and disposed of at the <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 wastelbum 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/burn pit area, and collected soil samples for analysis. According to <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) <br /> 1996 SITE INVESTIGATION <br /> In 1996 Geologic Technics was contracted by Hunter Container to investigate a potential TCE <br /> and/or volatile organic compounds (VOC) 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 <br /> from depths ranging from 6 to 31 feet bgs. Ethylbenzene, xylenes, TPHg, TPHd, and TPHmo <br /> were detected in the majority of the samples. <br /> Groundwater samples were collected from MW-1 at approximately 30 feet bgs and tested. TPHg <br /> and TPHd concentrations detected in groundwater were 61,000 and 3,000 micrograms per liter <br /> (µg/L). During the borehole drilling for well MW-1 "third phase product [was] floating on the <br /> 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 /> ' petroleum-hydrocarbon plume sourced from one or both of the two petroleum pipelines located <br /> approximately 34 feet northeast of the Hunter Container building, and owned by Southern <br /> Pacific Pipeline Company and Chevron. The environmental firm recommended that "San <br /> Joaquin County and RWQCB work with the two pipeline companies to address the petroleum <br /> hydrocarbon issue." <br /> ' 4. Geological Technics,Inc., 1996. Report,Soil and Groundwater Investigation,Hunter Container,35275 Welty Road, <br /> Vernalis, California. October. <br /> B-2 <br /> SM—MA __ <br /> =sG C Gi <br /> From Science to Solutions <br />