SITE INFORMATION AND CORRESPONDENCE

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x Fab-14-08 04:34pm From-BROWN AND %TELL 916 835 8805 T-541 P.004/005 F-310 •_� T & T Trucking, Inc-, Site Work Narrative—Diesel USS' - been in operation as a trucking terminal at its carrent location has be T& T Trucking,Inc. (T 8tr T) P since 1961. A 10,000 gallon diesel UST was reportedly installed in the mid 1970's.The diesel UST was removed and transported off site by Johnson Petroleum Construction Inc. on May 6, 1999. The UST was approved for removal by San Joaquin County Public Health Services, - environmental Health Departm pnt (pPIS/1;hID} and the local fire depar=e+nt. The UST cavity is located on the sourh side of the worksbop building,which is the maim truck thoroughfare at this site. Under the direction of PHS/0-11D two soil samples welx:collected from the borroro the cavity,one on each end of the'UST(W1-16,E1-16). These,two soil samples went collected approximately three feet deeper than the excavadon botiom at a depth of appmximately 16 feet below ground surface(bgs). The two soil samples were collected froze the backhoe bucket per approval and under supervision of Ms.Lettitia)3riggs (PHS/EI-ID). In the eastern half of the excavation, noticeable discoloration was evident on the sidew lls and the excavation bottom- Approximately 280 cubic yards of soil were removed fivm the USI'excavation. Excavated soil was stockpiled on plastic on site. FHS/BHD stockpile soil sample requirements,as verbally communicaeed 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 backAll;ng into >� the excavation,or four samples per 100 cubic yards tab c composited in the laboratory to one sample for material slated for landfill disposaL Pet Mr.Terry Tardzts,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 SP-4 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 composite din,rhe laboratory into one sample (SP 9,SP-10,and SP- was observed PH5/EHD. 11). All sampling by r The soil sample collected at the west end of the USTexcavation floor (W1--16) contained 600 mijbgtams per kilogram(mg/K4'1TPHd and did not contain detectable concentracians of Bl'-,TX. The soil sample collected at the east end of the UST excavation float contained 3,100 mg/I19 Tl'Hd and did not contain detectable concezittations of B TX. Stockpile soil samples generally contained traces of ethylbw7tene and/or total xylenes and elevated concwtrations of TPhld_ 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.mzatcriA On May 25, 1999 Brown and Caldwell submitteda workplan for soil sampling in the USI'over- eFcavarion. T&T Trua--ing and The PHS/EHD agreed that the excavation can bc backfi]led and the lateral cxrent:of diesel can be delineated by boreholes. On June 1, 1999T&T Tracking 4