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Page 2 of 4 Table 4 Groundwater Analytical Results Oxygenate Compounds ARCO Service Station#595 6100 N Highway 99 Stockton CA Well Date TBA MtBE DIPS EtBE TAME 1 2-DCA EDB Ethanol Number Sampled (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MW-4 6115/1996 807 3,200 <2 0 <2 0 448 844 <2 0 — 9118/1996 637 2,510 <2 0 <2 0 308 229 <2 0 — 11/1/1996 570 2,200 <2 0 <2 0 <2 0 280 <2 0 — 31411997 301 1,760 225 <2 00 207 240 <2 00 — 5/7/1997 <4 000 2,140 <40 0 <40 0 <40 0 203 <40 0 — 7/31/1997 <1000 1,400 <10 <10 <10 220 <10 — 10/2211997 Dry Well 1/31/1998 320 690 <10 <10 <10 190 <10 — 4/10/1998 160 670 <5 0 <5 0 <5 0 150 <5 0 — 7/1611998 Insufficient Amount of Water to Sample Well 1 01111 9 9 8 Insufficient Amount of Water to Sample Well 1/1611999 Insufficient Amount of Water to Sample Well 4/2/1999 Ory Well---- - 7/2011999 Insufficient Amount of Water to Sample Well 9/30/1999 Dry Wei' 11612000 ——— -- ---— Insufficient Amount of Water to Sample Well -- MW —MW 5 7/31/1997 <200 26 <2 0 <2 0 <2 0 32 <2 0 1012211997 <100 <10 <10 <10 <10 21 <10 — 1/31/1998 <5 0 <0 50 <0 50 <0 50 <0 50 050 <0 50 — 4/10/1998 Not Accessible 7/1511998 <5 0 12 <0 50 <0 50 <0 50 <0 50 <0 50 <50 1011/1998 <20 070 <0 50 <0 50 <0 50 <0 50 <0 50 <40 1/1611999 <20 086 <0 50 <0 50 <0 50 070 <0 50 <40 4/2/1999 <20 12 <0 50 <0 50 <0 50 057 <0 50 <100 712111999 <20 1 2 <0 50 <0 50 <0 50 <0 50(a) <0 50 <100 1011/1999 <20(a b) 0 52(b) <0 50(b) <0 50(b) <0 50(b) 0 70(b) <0 50(b) <100(b) 1/7/2000 <20 058 <0 50 <0 50 <0 50 12 <0 50 <100, MW 6 7/3111997 <200 <2 0 <2 0 <2 0 <20 <2 0 <2 0 -- 10/22/1997 <100 <1 0 <t 0 <1 0 <1 0 <1 0 <1 0 1/3111998 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 4/10/1998 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 — 7115119 98 <5 0 Is <0 50 <0 50 <0 50 <0 50 <0 50 <50 10/1/1998 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <40 111 611 99 9 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <40 4/2/1999 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <100 7/21/1999 <20 <0 50 <0 50 <0 50 <0 50 <0 50(a) <0 50 <100 10/111999 <20(a b) 0 52(b) <0 50(b) <0 50(b) <0 50(b) <0 50(b) <0 50(b) <100(b) 1/7/2000 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <100 MW-7 7/3111997 <200 94 <20 <2 0 <2 0 23 <2 0 10/22/1997 <100 100 <10 <10 <10 26 <10 — 1/3111998 79 a5 <0 50 <0 50 <0 50 25 <0 50 4110/1998 <5 0 56 <0 50 <0 50 <0 50 16 <0 50 — 7/1611998 86 87 <0 50 <0 50 <0 50 16 <0 50 <50 10/111998 <20 130 <0 50 <0 50 <0 50 22 <0 50 <40 1/16M999 <20 82 <0 50 <0 50 <0 50 15 <0 50 <40 4/2/1999 <40 78 <10 <10 <10 15 <10 <200 7/2111999 <40 99 <10 <10 <10 17 <10 <200 10/111999 <500(b) 99(b) <12(b) <12(b) <12(b) 20(b) <12(b) <2 500(b) 117/2000 <40 76 <10 <10 <10 15 <10 <200 MW-B 7/1511998 <5 0 15 <0 50 <0 50 <0 50 093 <0 50 <50 101111998 <20 38 <0 50 <0 50 <0 50 13 <0 50 <40 1/1611999 <20 26 <0 50 <0 50 <0 50 096 <0 50 <40 4/2/1999 <20 46 <0 50 <0 50 <0 50 098 <0 50 <100 7/21/1999 <20 69 <0 50 <0 50 <0 50 <0 50(a) <0 50 <100 10!111999 <20(a b) 2 7(b) <0 50(b) <0 50(b) <0 50(b) 0 62(b) <0 50(b) <100(b) 1/7/2000 <20 24 <0 50 <0 50 <0 50 <0 50 <0 50 <100 1 1ARCOQ5951TableslSCWTable 4-Groundwater Analytical Results Oxygenate Compounds As