ARCHIVED REPORTS XR0007674 - Laserfiche WebLink

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Firestone Tire and Rubber Company Page 2 Stockton, CA., Soil Sampling Results • 10, 1991. The workplan anticipated analysis for total petroleum hydrocarbons (TPH) and benzene, toluene, ethylbenzene, and xylene (BTX&E). Diesel concentrations were reported at minor concentrations in all samples; ranging from 1.3 to 1.7 mg/kg. One sample in Boring 2, at the 15 to 16 � �ther B &E was reported with minor concentration of xylene at 0.024 mg/kg. All concentrations were reported below detection limit. Additional soil samples for PCBs and soluble lead were also analyzed at the request of the PHS inspector, Harlin Knoll. The PHS requested the samples to confirm that 1) PCBs are not detected at the site, and 2) the low total lead concentrations summarized e e workplan are not all soluble. As summarized an Table 1e no detectable PCBs or soluble lead reported , above 0.017 mg/kg and 0.3 mg/l, respectively. Based on the drilling work, field observations by Weinfelder, and laboratory results reported by Curtis and Tompkins, the chemical distribution at the Tank 5 site appears to be local and contained within thenear r ordistrsoils to the adjacent to the tank. There appears to be no horizontal migratione north and south of the tank site. Th laboratory results.lso pory ars to be no vertical migration based on the 30 and 40 foot soil sample la After drilling work was completed and soil sampleretrieved, e two as present were sealed with a bentonite/cement grout slurry. during the sealing work. At the request of the PHS, the Tank 6 site was resampled to confirm that there have been no releases or migration of gasoline compounds at the site. Additional soils were excavated from the western extent of the tank site to a depth of 16 feet. The location of the resampling work was based on what the PHS considered marginally high TPH as gasoline (34 mg/kg) reported for the western soil sample in the Work Plan. olubleoil �lead analysles were �was requeszed for ted in the field by H as gasoline, BTX&E, and soluble lead. The s the PHS inspector, Harlin Knoll. To provide a vertical, as well as horizontal profile of potential hydrocarbons in soils at the Tank 6 site, soil samples were taken at three locations and at varying depths: bottom of the excavation at 16 feet below grade, and the north and south walls of the excavation at 14 feet and 12 feet, respectively Each soil sample was taken by diving apre-cleaned brss tube intowere taken,each brass tubedisturbed s was sealed with n the excavation. After the soil samples teflon tape, capped, logged, and placed on ice. All soil samples were reported below detection limits. Based on the laboratory results reported by Curtis and Tompkins there appears to be no hydrocarbon release from the Tank 6 site.