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Table 4: Summary of Analytical Data - Groundwater ' Y or Service 1600 Durham Ferry Road Tracy, California Project No.425.2 Summary of Groundwater Analytical Data Wells Date Benzene Toluene Ethyl I Total TPH MTBE Benzene I Xylenes Gasoline ug/L ug/L ug/L-__]__ug/L uglL ug/L MW-1 05/04/95 45 40 8.0 60 470 NA 09/13/96 24 1.0 6.0 10 186 7* 01/17/97 17 1.0 4.0 4.0 176 9* �I 05/05/97 47 2.0 2.0 13 331 13/5.8' 09/19/97 12 0.6 2.0 6.0 75 2.8 02/24/98 24 1.0 3.0 13 181 4.0 + 05/29/98 5.0 ND<.3 2.0 2.0 ND<50 ND<2 11/13/98 18 0.8 2.6 8.6 97 ND<5 } 04/28/99 11 0.6 3.0 7.8 94 ND<5 09/01/99 7 ND<0.3 0.7 5.4 ND<50 ND<5 i 12/22/99 100 4.3 32 87 820 NIA {' 03/31/00 174 1.0 9 47 667 7* I 06/20/00 170 2 17 128 1,300 2* i 09/20/00 169 2 8 66 871 N D<2 12/27/00 182 2 30 93 960 N D<2 } 03/06/01 136 ND<0.3 28 78 710 ND<2 06/20/01 162 2 23 111 1,080 NIA i 09/07/01 175 0.9 15.9 79.4 928 26* 12/03/01 170 1.2 18.9 79.3 942 4.6* 02/22/02 268 3.5 119 358 2,680 3.7* p; 06/05/02 84.6 0.4 40.9 136 779 2.5 L 09/11/02 63.5 0.8 13.8 140 1,220 . ND<2 12/26/02 101 0.9 35.4 112 925 NIA 03/21/03 64.7 0.9 47.9 123 981 N D<1 06/06/03 1 79.9 0.6 25.2 67.4 672 1.3* 09/05/03 238 1.8 91.1 171 1 1,450 3.3 MW-2 05/04/95 40 57 11 55 530 NA 09/13/96 FP FP FP FP FP FP 01/17/97 FP FP FP FP FP FP 05/05/97 287 548 178 798 6,810 ND<5 09/19/97 743 1,380 455 2,800 18,600 ND<20 02/24/98 384 FP 507 FP 1 { } { ) 1 2 (FP) 574 (FP) 4100(FP) NDC2 05/29/98 2,800 5,220 2,200 14,600 334,000 <200 11/13/98 450 730 360 2,000 6.400 ND<5 04/28/99 2,600 2,400 970 4,300 40,000 ND<5 09/01/99 10,000 12,000 11,000 44,000 890,000 ND<.10,000 L_ 12/22/99 1,400 3,500 1,100 4,800 44,000 NIA 03/31/00 1 5,350 11,900 2,710 12,800 89,600 391* r+ 06/20/00 3,640 8,280 2,160 9,600 84,800 ND<200 09/20/00 1,650 3,600 1,350 1 4,990 4,350 247* E I - �eo�icnl?eclurics7r�t 11/12/03