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Table 1 Page 1 of 1 Groundwater Elevation and Analytical Data Former ARCO Service Station#595 6100 North Highway 99,Stockton,CA Well Depth Groundwater Groundwater Ethyl MtBE MtBE Well Date Elevation to Water Elevation Elevation TPI-Ig Benzene Toluene benzene Xylenes 8020 8260 DO Name Sampled (feet,MSL) (feet,TOC) (feet,MSL) Change(feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) MW-1 6/16/2000 NP 3555 5765 -2210 -- 1340 734 6 69 945 164 <125 <2 0 NM 9/19/2000 NP 3555 60 68 -2513 -303 2,990 189 182 676 115 <50 0 242 0 3 11/2/2000 P 3555 6074 -2519 -006 3,000 258 46 7 105 196 <25 0 2 5 29 3/5/2001 P 35 55 60 90 -2535 -016 4,250 479 fib 6 208 386 203 128 52 5/8/2001 P 35 55 6140 -2586 -050 2,130 179 109 590 91 4 771 4 59 043 MW-2 6/16/2000 NP 3294 5572 -2278 655 28 0 882 2 58 194 179 116 NM 9/19/2000 NP 32 94 5843 -2549 -271 495 364 <0 50 <0 50 1 45 760 93 6 0 6 11/2/2000 P 32 94 5942 -2648 -0 99 428 126 <0 50 177 204 808 71 2 8 3/5/2001 P 32 94 5839 -2545 103 476 287 1 08 837 277 740 601 4 9 5/8/2001 P 32 94 5905 -2611 -066 315 135 0 638 2 65 148 778 998 0 46 MW-3 6/16/2000 NP 3361 5635 -2274 226 289 <0 50 2 84 102 929 869 NM 9/19/2000 NP 3361 5901 -2540 -266 217 0 582 <0 50 <0 50 <0 50 <2 5 <2 0 0 5 11/2/2000 P 3361 5911 -2550 -010 162 <0 50 <0 50 <0 50 <0 50 120 11 13 3/5/2001 P 33 61 5902 -2541 009 178 <0 500 <0 500 <0 500 0 732 4 43 735 5 6 5/8/2001 P 3361 5975 -2614 -073 166 0 515 <0 500 <0 500 0 711 2 96 3 93 060 MW-4 6/16/2000 NP 3377 5656 -2279 8,910 2,310 <0 50 83 9 1,520 3,680 3,200 NM 9/19/2000 NP 33 77 5924 -2547 -268 18,900 2,240 <20 0 693 2,230 2,240 2,510 0 4 11/2/2000 P 33 77 5859 -2482 0 65 9,230 1,740 <50 0 154 951 1,990 2,200 1 7 3/5/2001 P 33 77 5917 -25 40 -058 5,250 738 <20 0 335 <20 0 1,870 1,760 4 2 5/8/2001 P 3377 5984 -2607 -067 2,890 875 <20 0 344 <20 0 2,350 2,140 0 50 WSW 11/2/2000 NM NM NM -- <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 <2 0 NM 3/5/2001 NP NM NM NM <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 <2 00 NM 5/8/2001 NP NM NM NM — <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 <2 00 213 TOC=Top Of Casing MSL=Mean Sea Level TPHg=Total Petroleum Hydrocarbons as gasoline analyzed using EPA Method 8015 Modified MISE 8020=Methyl tart-butyl ether analyzed using EPA Method 8020 MtBE 8260=Methyl tart-butyl ether analyzed using EPA Method 8260 P/NP=Purged/Not Purged <=below laboratory detection limit,or nondetect ppb=parts per billion mglL=milligrams per liter NM=Not measured - =Not Applicable DO=Dissolved Oxygen