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OE I Groundwater Elevation and Analytical Data ' ARCO Service Station No 2186 3212 North Califomla Street Stockton Caldomfa Top of Casing Static Water[1] Screen Groundwater Total Well Sample Elevation level Interval Elevation Groundwater TPH9 Benzene Toluene Ethylbenzent Xylenes MtBE[3] Sample No Date (feet msi) (feet bgs) (feet bgs) (feet msl) Flow Direction ug/L ug/L ug/L &L _ ig/L vg/L Observations MW 1 9/2511995 1465 5805 456747 4340 SE 20 000 780 2000 690 4 100 NA No FP No S 10!2311995 5789 4324 — 20 000 590 1,100 600 3 600 NA No FP No S /2122/1995 5378 3913 E 730 35 <1 0(2] 13 13 NA No FP No S 2/16/1996 5013 3548 E 1200 22 <1 0(2] 51 24 NA No FP No$ 5/2311996 035 3070 E 760 90 10 22 50 <50 No FP No S 9/19/1996 5363 -3898 NE 10 000 480 570 520 700 <50' No FP No S 11127/1996 5077 3612 SE 19 000 700 1 800 820 2200 <100 No FP No S 3/21/1997 4206 2741 SE 5 300 260 210 200 440 <30 No FP No S 5/22/1997 4389 2924 E NE 25 000 920 1900 1 400 3 500 <120 No FP No S 8/20/1997 4983 3518 E NE 31 000 1 000 2,800 1 300 4 000 4500' No FP No S 11!2011997 4907 3442 E 24 000 830 1 900 1 100 3 600 <1 000' No FP No S 2!1711998 4432 2967 E SE 19 000 680 990 980 3200 <100 No FP No S 6/24/1998 3579 21 14 E 505 275 <2 5 602 973 <25 No FP No S 9/21/1998 3935 2470 E NE 18 900 792 1 410 1 130 3 690 4125 No FP No S 12114/1998 3734 2269 E NE 13 800 613 449 896 2 800 <100 No FP No S MW t(Discrete) 12!14/1998 3734 2269 E NE 7,170 424 161 527 848 <100 No FP No S 3/31/1999 3414 1949 N NE 817 432 <0 5 <0 5 <0 5 <5 0 No FP No S 6/1111999 3422 1957 E NE 7 310 397 162 543 1 500 <50 No FP No S 9/10/1999 3841 2376 E NE 22 800 941 1 180 1 410 4 450 2 590 No FP No S 12/311999 3834 2369 E 15 400 552 155 907 2 680 517 No FP No S 4/3/2000 35 00 2035 NE 6,940 534 <20 518 1 260 334 No FP No S 6/22/2000 3513 2048 E 14 700 675 144 744 2 500 114[4] No FP,No S 9127/2000 4046 2581 E NE 1,190 531 202 843 2 140 4 500[4] No FP No S 10/19/2000 4025 2560 E NE NA NA NA NA NA NA Not observed 12/20/2000 3833 23 65 E NE 14 600[5] 704 1 T 1 741 2 870 2000 No FP No S 3/1612001 3725 2260 E NE 16 800[5] 1 210 802 848 4 230 2 190(4] No FP No S 6/21/2001 4002 2537 NE 24 000[51 1,000 380 980 4 100 28 000[4] No FP No S 9/13/2001 4582 31 17 E NE 38,000 2200 2200 2 100 8 800 4,500[4] No FP No S 12!1112001 4305 2840 NE 13 000 920 430 780 3 100 8 800141 No FP No S 3+1412002 3999 2534 E NE 5 800 620 120 420 1 500 4 700[4] No FP No S 6119=2 4230 2765 E NE 12 000 430 320 310 1200 17 000[4] No FP No S 9112+2002 4111303 53 E NE 64 000 2 900 4100 3 100 14 000 3 100 No FP No$ 1ZW2002 46 24 3159 E-NE 30 000 1,700 950 1 500 5 700 3 100 No FP No S 3111/2003 4556 3091 NE <5 000 360 <50 <50 <50 3200 No FP No S 6/9/2003 4241 2776 E NE <2 500 79 <25 <25 <25 10 000 No FP No S 9!1712003 6126 3561 _ NE 2,300 230 <50 <50 <50 3,600 No FP,No S K MprocessQS SP ARCOQ21861QuarteriN QTR 0312186 GWMR 3Q03 Page 1 of 8