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l� 11111!0 11� � � 1 � (♦ I♦ i <br /> Former Beacon Station No 419 February 17, 1999 <br /> Stockton California Additional Subsurface lnvesti ation <br /> Table 2 - Groundwater Data <br /> GROUNDWATER LEVELS LABORATORY ANALYTICAL DATA <br /> Well No/. Sample Depth Ground- <br /> Elevation/ Date to water TPHg Benzene Toluene Ethyl- Xylenes MTBE DIPE ETBE TAME TBA Meth. Ethan. <br /> Screen Water Elevation benzene <br /> Interval <br /> (feet) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) i (ppb) i-..-(ppb) (ppb) i (ppb) (ppb) i (ppb) i (ppb) <br /> SB-6(881) 09/22/98 na na 5,600 100 510 170 920 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <br /> AS-1 09/30/98 4835 -2751 62,000 14,000 18,000 1,500 7,600 20 <0 50 <0 50 <0 50 70 <50 3,400 <br /> 20 84' <br /> 64'-69' <br /> MW-7 09/30/98 4821 -2766 150 <0 50 <0 50 <0 50 <0 50 13 <050 <050 <0 50 69 <50 <5 0 <br /> 20551 <br /> 41'-66' <br /> MW-8 09/30/98 4805 -2767 120 10 <050 <050 17 21 <0 50 <0 50 <0 50 12 <50 <50 <br /> 20381 <br /> 41'-66' <br /> MW-9 09130/98 4809 -2744 6,900 560 280 480 1,600 061 <0 50 <0 50 <0 50 10 <50 <50 <br /> 20651 <br /> 41'-66' <br /> MW-10 09/30/98 dry dry ns ns ns ns ns ns ns ns ns ns ns ns <br /> 20 74' 12/11/98 4645 -2571 140 <0 50 <050 <0 50 078 <0 50 <0 50 <0 50 <050 87 <50 <50 <br /> 41'-61' <br /> TPHd=Total Petroleum Hydrocarbons as diesel TPFlg=Total Petroleum Ilydrocarbons as gasoline MTBE=methyl tertiary butyl-ether by EPA method 8260 <br /> RIPE=di-isoprorvi ether ETRE=ethyl tertiary bL iyl ether TAME=tertiary amyl irethyl ether <br /> TBA tertiary bu,vl alcohol Meth =methanol Ethan =ethanol <br /> ppb=parts per billion(gg/L) ns=not sampled na=not analyzed <br /> I419-12 rpt HORIZON ENVIRONMENTAL INC. <br />