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Table 4 Groundwater Elevation and Analytical Data ARCO Station#548 1612 West Hammer Lane Stockton,California Calc. TOC Depth to GW TOTAL Pl Elevation Water Elev. TPHg BENZENE TOLUENE ETHYLBENZENE XYLENES MTBE DO Well No. Sampling Date NP (ft MSL) (ft BGS) (N MSL) (pg1L) (pg1L) (NgfL) (pg1L) (pgfL) (14L) (mg1L) Comments VW-3 9/2911998 NP 29.45 39,300 2,360 391 1,540 1 9,790 <500 No FP,No 5 Yes O, 40 VW-3 1213011998 NP 27.28 40500 3 450 267 2 370 11,700 <500 No FP No S.Yes 0,1401 VW-3 313111999 25.87 No FP,No S,No O Not scheduled for sam lin _ „l7/ VW-3 6/2811999 26.88 No FP No S No O Not scheduled for sampling_ VW-3 911011999 28.69 No FP No S,Nn0 No[_scheduled for sampling_ Z VW-3 12/1311999 _ 28.06 No FP,No S,No O Not scheduled for sampingi Z VW-3 3/2812000 24 F3 _f _ No FP,No S,No O Not scheduled for sampling VW-3 1 612612000 29.78 No FP,No S,No O Not scheduled for sampling- VW-3 9/2812000 28.30 No FP,No S.No O Not scheduled for sampling VW-3 12/1812000 25.08 No FP No S No 0 Not scheduled for sampling_ VW-3 3114!2601 24.20 ND.FP.No S.No O Not scheduled for sampling__ VW-3 611912001 26.50 No FP,No S,No O Not scheduled for sampling VW-3 9/1112001 29.172 No FP No S No O Not scheduled for sampling VW-3 12/1312001 NP 28.35 1,100 150 1 <5.0 7.6 16 16[21 No FP,No S,No O VW-3 311212002 NP 24.80 I <50 <0.50 <0.50 <0.50 <0.50 0.72[21 No FP,No S,No 0 VW-3 6/1712002 NP 27.60 <50 <0.50 <0.50 <0.50 <0.50 <0.50[2]_ No FP No S,No O VW-3 919/2002 NP 29.45 <5D 5.5 <0.5 40.5 1.4 1.6 No FP,No S,No O VW-3 121412062 NP I 30.69 610 19 1.9 <0.5 7.9 4.6 No FP No S,No O VW-3 3/312003 NP 213,51 1,300 20 1.8 2w3 11 3.6[2 VW-3 6/312003 NP 28.55 83 4.3 <0.5 <0.5 <0.5 2.7[21 VW-3 911812003 NP 32.07 630 32 <5 7 7 <5 <5[21 VW-3 12/812003 NP 31.92 1,400 48 <10 24 <10 <10[2) VW-3 3/11/2004 NP 12.27 28.31 -16.04 1,000 68 <10 50 <10 <10[2] VW-3 5/11/2004 NP 12.27 30.92 -18.65 240 3.6 <0.5 <0.5 0.77 1.5[2] 1.6 VW-3 81312004 P 12.27 32.31 -20.04 7,000 160 <5 510 MOD 6.5[2] 1.4 VW-3 12/22/2004 P 12.27 31.62 -19.35 9,800 110 <10 480 990 <10[21 4.5 VW-3 3/29/2005 P 12.27 29.15 -16,88 5,200 75 <5 330 710 <5[21 2.15 VW-3 6/1612005 P 12.27 28.60 -16.33 <50 1.2 <0.5 <0.5 0.68 20['2 1.09 VW-3 919/2005 P 12.27 30.74 -18.47 6,800 66 j 45 440 740 <5 2 1.37 VW-3 12/7/2005 P 12.27 30.51 -18.24 9,800 60 Q.5 450 910 VW3/2212006 P 12.27 28.12 -15.65 6,800 36 <2.5 210 42D <2.5[2] 1.71 lABP-ARCO104 BP Valley Portfolioti5485Tables50&01L548 Table 1-2-3-4 Page 9 of 14 5/3112006