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TABLE 2 SUMMARY OF ANALYTICAL RESULTS-GROUNDWATER r FAYETTE MANUFACTURING SITE TRACY,CA (Page 3 of 3) POTENTIAL CONTAMINANTS OTHER GEOCHEMICAL PARAMETERS Sample Date TPI-Ig B T E X TBA DIPE ETBE TAME MTBE DO CO2 DFI N S TA Eh ID ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L mg/L mg/L mg/L mg/L mg/L mg/L mV MW4 03/11/99 68.9 <0.50 2.27 0.854 4.24 <200 <2.0 <2.0 <2.0 <2.0 -- -- -- -- -- -- -- 06/24/99 <50 1.7 <0.50 <0.50 <0.50 -- -- - -- <2.5 -- -- -- -- -- -- -- 02/02/01 <50 <0.5 <0.5 <0.5 <0.5 <20 <2.0 <2.0 <2.0 <2.0 -- -- -- -- -- -- -- MW5 03/11/99 <50.0 <0.50 13.7 <0.50 <0.50 <200 <2.0 <2.0 <2.0 <2.0 -- -- -- -- -- -- -- 06/24/99 <50.0 <0.50 0.51 <0.50 <0.50 -- -- -- -- <2.5 -- -- -- -- -- -- -- 02/02/01 <50.0 <0.5 <0.5 <0.5 <0.5 <20 <2.0 <2.0 <2.0 <2.0 -- -- -- -- -- -- -- MW6 03/11/99 <50.0 <0.50 <0.50 <0.50 <0.50 <200 <2.0 <2.0 <2.0 <2.0 -- -- -- -- -- -- - 06/24/99 <50.0 <0.50 <0.50 <0.50 <0.50 -- -- - -- <2.5 -- - -- -- -- -- -- 02/02/01 <50.0 <0.5 <0.5 <0.5 <0.5 <20 <2.0 <2.0 <2.0 <2.0 -- -- -- -- -- - - SB1-GW 09/24/96 <50 <0.3 0.6 <0.3 <0.6 -- -- - -- <1.0 <1.0 22 <0.05 25 150 360 -56.1 SB2-GW 09/24/96 67,000 2,200 370 5,400 19,000 -- -- - -- <50 <1.0 90 <0.05 6 80 620 - SB3-GW 09/24/96 <50 <0.3 0.7 <0.3 <0.6 -- -- -- -- 3.5 <1.0 35 <0.05 470 17 170 -123.4 SB4A-GW 10/02/96 4,600 58 16 270 250 -- -- -- -- <1.0 <1.0 55 <0.1 9 128 510 -201 SB5-GW 10/02/96 <50 <0.3 <0.3 <0.3 <0.6 - -- -- -- <1.0 <1.0 54 <0.1 30 243 440 -214 SB6-GW 10/02/96 5,200 160 32 210 910 - - - -- <1.0 2.1 <0.5 <0.1 37 180 310 -143.3 SB7-GW 10/02/96 <50 <0.3 <0.3 <0.3 <0.6 -- -- -- -- <1.0 <1.0 33 <0.1 80 280 420 -213.6 Notes: mg/L denotes milligrams per liter or parts per million DIPE denotes di-isopropyl ether(EPA Method 8260) ug/L denotes micrograms per liter or parts per billion ETBE denotes ethyl tertiary butyl ether(EPA Method 8260) <denotes not detected at or above Stated Method Detection Limit TAME denotes tertiary amylmethyl ether(EPA Method 8260) denotes not analyzed MTBE denotes methyl tertiary butyl ether(EPA Method 8020 or 8260) `denotes that MTBE has been confirmed by Method 8260 DO denotes dissolved oxygen ""denotes MTBE detected by EPA Method 8020 only CO2 denotes Carbon Dioxide TPHg denotes total petroleum hydrocarbons as gasoline(EPA Method 3550/8015) DFI denotes dissolved ferrous iron B denotes benzene(EPA Method 8020) N denotes nitrate T denotes toluene(EPA Method 8020) S denotes sulfate E denotes ethylbenzene(EPA Method 8020) TA denotes total alkalinity X denotes total xylenes(EPA Method 8020) Eh denotes redox potential in millivolts(mV),Feld measured TBA denotes tertiary butanol(EPA Method 8260 (field measurement during well purging process) W117861\Table2b[3/1/2601]