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Table 1 Groundwater Monitoring Data and Analytical Results Former Unocal Service Station No. 0187 437 East Miner Avenue Stockton, California Product WELL 1D/ DATE DTW S.I. GWE Thickness TPHg B T E X MTBE TOC-(ft.) (ft.) (ft.bgs) (mut) (ft} (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) NP-2-60 02/01/999 26.62 -- -- 0.00 -- -- -- -- -- 02/05/99 26.50 -- 0.00 9,700 950 290 710 680 -- 11.00 05/07/99 25.29 -14.29 0.00 11,000 1,000 210 780 1,200 -- 08/20/99 25.88 -14.88 0.00 8,70010 950 160 380 560 -- 11123-24199 26.81 -15.81 0.00 5,84010 1,030 76.6 234 357 522/<20.04 02122-23100 25.96 -14.96 0.00 15,00010 4,200 430 990 1,200 <500/<104 05130-31100 24.68 -13.68 0.00 17,40010 4,590 501 816 1,230 <500/<40.04 08131-09/01/00 25.51 -14.51 0.00 15,00010 4,730 269 623 836 <1,000/<40.04 11.63 11120-22/0025 26.01 -14.38 0.00 13,30010 4,350 191 498 527 <500/<66.74 12/07/00 25.96 -14.33 0.00 20,40010 5,580 257 587 678 -- 02/26-27101 25.66 -14.03 0.00 9,780 4,120 286 244 393 <50.0/<2.04 05/14-16101 25.53 -13.90 0.00 8,10070 3,270 200 190 297 <250/<66.74 08113-15101 26.52 -14.89 0.00 10,00010 3,800 220 130 280 <500/<334 11126-28101 27.56 -15.93 0.00 7,700i0 3,100 96 <50 160 <500/<334 02/25-27102 26.81 -15.18 0.00 3,900?° 1,100 29 <10 79 <100/<104 05107-09102 26.90 -15.27 0.00 20,000f0 7,600 310 370 270 <1,0001<334 08/12-14102 28.72 -17.09 0.00 7,40028 3,500 100 <50 140 4901<1.04 11105-06102 28.89 -1726 0.00 220 13 <0.50 <0.50 <0.50 8.91<2 04 02/04-06103 29.05 -17.42 0.00 2,600 1,100 35 <10 44 <40/<2.04 05127-30/03 28.97 -17.34 0.00 860 290 15 2.8 31 341<5.04 08126-29103 30.31 -18.68 0.00 330 65 9 1.9 27 5.8/<0.504 12/02/03 32.18 -20.55 0.00 57 7.7 0.91 0.72 1.2 <0.504 02/16-18/04 30.12 -18.49 0.00 310 110 7.9 5.8 8.3 <0.504 04/19/04 31.81 -20.18 0.00 810 47 25 15 28 <0.504 08/16/04 31.45 -19.82 0.00 1,200 28 210 34 9.1 28 <1.04 11/15/04 31.60 -19.97 0.00 1,10028 170 29 8.7 32 <0.504 02/14/05 30.84 ✓ -19.21 0.00 380 28 29 8.2 3.8 17 <1.o° 06944- 3410 ENSR ration