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Table 4 Groundwater Elevation and Analytical Data ARCO Station 17548 1612 West Hammer Lane Stockton,California Calc. TOC Depth to GW TOTAL P/ Elevation Water Elev. TPHg BENZENE TOLUENE ETHYLBENZENE XYLENES MTBE DO Well No. SamplIna Date NP (ft MSL) (ft BGS[ (ft MSL) (NgIL) (NgIL) (Ng1L) (Ng1L) (NgIL) (Ng1L) (m91L) Comments AS-1 8!312004 P 11.61 31.71 I -20.10 470 56 <2.5 5.8 32 120[2] 3.6 AS-1 1212212004 P 11.61 31.09 19.48 I 330 15 <2.5 <2.5 <2.5 150(2] 5.5 AS-1 3129/2005 P 11.61 28.81 -17.20 200 9.2 <2.5 <2.5 <2.5 110[2] 2.43 50 AS-1 6/1612D05 P 11.61 28.02 -16.41 2 21 c1 3.3 6.4 100[2] 0.69 AS-1 919/2005 P 11.61 30.21 -18.60 450 41 e1 5.4 10 120(21 0.41 AS-1 121712D05 P 11.61 29.97 -18.36 220 11 I c1 2.5 1.1 95[21 AS-1 312212006 P 11.61 27.96 -16.35 170 6.5 I <0.50 2.2 0.67 67[2] 7.15 AS-2 8/3/2004 P 12.15 31.74 -19.59 16004.8 5.6 36 38 2.8121 1.6 AS-2 1212212004 P 12.15 31.57 -19.42 5000 17 35 140 530 4.3[2) 5.5 } AS-2 3/29/2005 P 12.15 29.09 -16.94 3500 15 27 110 410 3.1[2) 1.45 r AS-2 6116/2005 P 12.15 28.45 -16.30 4700 21 34 130 540 3.9[2) 0.51 AS-2 919/2005 P 12.15 30.64 -18.49 5200 15 17 110 320 4.9[21 0.28 AS-2 12/712005 P 12.15 30.40 -18.25 5600 <25 26 140 520 <25[2 AS-2 312712006 P 12.15 27.96 -15.81 4,400 <25 <25 110 450 <25[21 5.12 I I AS-3 813!2004 P 12.03 31.83 -19.80 84 0.7 <0.5 2 1.4 0.8(2 1.6 AS-3 12/2212004 P 12.03 31.44 -19.41 190 0.62 <0.5 1.8 0.96 0.7[2] 4.1 \ AS-3 3!29/2005 P 12.03 2&95 -16.92 140 <0.5 40.5 1.7 0.99 0.65[2] 2.05 .35 AS-3 6116/2005 P 12.03 28.38 -16 120 0.53 <0.5 2.4 1.6 0.57[2]_ AS-3 919/2005 P 12.03 30.53 -18-50 220 0.85 <0.5 3.5 1.5 0.94[2] 0.87 AS-3 12/712005 P 12.03 30,29 -18.26 160 0.59 40.52 1.2 0,69[21 AS-3 3122/2006 P 12.03 27.86 -15.83 98 <0.50 <0.50 1.2 0.7 <0.50 5.88 I I:1BP-ARCD504 BP Valley PoMoho55485Tables106-Q1%548 Table 1-2-3-4 Page 13 of 14 513112006