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Beacon Station No 641 December 8, 1997 Sloghton.California Additional Subsurface Investigation Report Table 1 (cant.) Laboratory Analytical Data - Soil Sample Sample TPHg MTBE(8020)1 Benzene Toluene F-Benzene Xylenes Oxygenates Number Date (ppm) MTBE(8260) (ppm) (ppm) (Ppm) (ppm) (ppm) (Ppm) S-20-MW5 09/17/97 51 581>l5$ <0 20 052 <0 20 056 15 (twt-butanol) S-30-MW5 09/17/97 14 13 0 039 0 012 00087 0 050 na S40-MWS 09/17/97 18 5 1 1 6 23 024 16 na S-50-MW5 09/I7/97 45 15 052 084 0 083 051 na • S-55-MW5 09/17/97 77 074 096 14 0 18 098 na S-20-VE5 09/16/97 690 26/>10$ <0 20 19 1 8 86 1 8 (tent-butanol) S-30-VE5 09/16/97 50 1 8 0 050 041 0 074 073 na S40-VE5 09/16/97 13 34 12 18 0 18 1 1 na S-50-VE5 09/16/97 54 097 10 047 0 15 067 na S-55-VE5 09/16/97 <1 0 025 040 0 055 0 065 0 16 na 'r S-20-VE7 09/17/97 22 29/>10$ <0 020 0 056 <-0 020 0 095 na S-30-VE7 09/17/97 <1 0 <0 050 <0 0050 <0 0050 <0 0050 <0 0050 na S-40-VE7 09/17/97 1 2 0 074 00065 00054 0 044 0 068 na S-50-VE7 09/17/97 <1 0 035 <0 0050 <0 0050 <0 0050 0 012 na S-55-VE7 09/17/97 24 044 031 037 0 048 032 iia SP A,B,C,D 07/22/96 170 <0 50 692 074 077 79 na SP-1 A,B,C,D 09/17/97 20 <0 050 1 00062 1 00086 00089 0 065 1 na TPHg=total petroleum hydrocarbons as gasoline MTBE= methyl tertiary-butyl ether (8020)= laboratory analytical method na=not analyzed t=selected samples analyzed for oxygenates MTBE,di-isopropyl ether(DIPS), ethyl-t-butyl ether(ETRE), tert-amyl methyl ether (TAME), methanol,ethanol, and tent-butanol by EPA Method 8260 were all below laboratory detedlon levels = In order to maintain sensitivity for the other oxygenate species, the sample was not diluted to bring the MTBE within normal calibration range, hence quantification was not possible The presence of MTBE was confirmed and the EPA 8020 value should be used Mr / i' i 1641-13 rpt HORIZON ENVIRONMENTAL INC