ARCHIVED REPORTS_XR0012960 - Laserfiche WebLink

Home Browse Search

r Mr.Ronald Rowe May 25, 1999 Page 2 two soil samples were collected from the backhoe bucket per approval and under supervision of Ms. Lettitia Briggs (PHS/EHD). In the eastern half of the excavation, noticeable discoloration was evident on the sidewalls and the excavation bottom. Approximately 280 cubic yards of soil were removed from the USTi excavation. Excavated soil was stockpiled on plastic on site. PHS/EHD stockpile soil sample requirements, as verbally communicated from PHS/EHD to BC on May 6, 1999, were as follows: Two samples per 50 cubic yards to be composited in the laboratory to one sample for soil slated for backfilling into the excavation, or four samples per 100 cubic yards to be composited in the laboratory to one sample for material slated for landfill disposal.-'I Per Mr.Terry Tarditi, none of the stockpile soil was slated to be used for the diesel UST backfill material. The stockpile was segregated into two piles; one larger pile (approximately 16 feet wide by 80 feet long and 4 feet tall) and one smaller pile (approximately 16 feet wide by 30 feet long by 5 feet tall). A total of eight samples to be composited into two samples were collected from the larger stockpile; samples SP-1, SP-2, SP-3, and SP4 were composited in the laboratory into one sample, and samples SP-5, SP-6, SP-7, and SP-8 were composited in the laboratory into one sample. Three samples were collected from the smaller stockpile and were composited in the laboratory into one sample (SP-9, SP-10, aria SP-11). All sampling was observed by PHS/EHD. All soil samples were collected in brass tubes, immediately covered jwith foil, capped with plastic end caps,taped, labeled with the date, time, sample name, and analytical method, and placed into a cooled ice chest. The soil samples were courieredito Kiff Analytical (State certified# 2236) located in Davis, California for analysis. Each sample was analyzed for total petroleum hydrocarbons as diesel[(TPHd) EPA method 80151modified] and benzene, ethylbenzene, toluene, and total xylenes [(BETX) EPA method 8260BD. Analytical Results Soil sample analytical results are summarized in Table 1. In summary, the soil sample collected at the west end of the UST excavation floor (W 1-16) contained 600 milligrams per kilogram (mg/Kg) TPHd and did not contain detectable concentrations of BETX. The soil sample collected at the east end of the UST excavation floor contained 3,100 mg/Kg TPHd and did not contain detectable concentrations of BETX. Stockpile!soil samples generally contained traces of ethylbenzene and/or total xylenes and elevated'concentrations of TPHd. The highest TPHd concentration (7,900 mg/Kg) was detected in composite sample SP-9, SP-10, SP-11 which consisted of the UST overburden and bottom material. Laboratory reports are attached as Exhibit A. Use or disclosure of data continued on this sheet is subject to the restriction specified at the'beginning of this document. } BCSACOI\P.\16000\16271\WRULN3.doc 4 i I