ARCHIVED REPORTS_XR0008602 CASE 1

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Table 2 30-0140 Summary of Results of Ground Yater Mom toring and Sampling Former MobiL Station 04-NP4 2375 Tracy Boulevard, Tracy, California Concentrations in parts per billion (ppb) WELL DATE Of CASING^==='DEPTH GROUND FREE TPH-G 8 T====- E ==--=XFC =_---==FS=======LAB ID - SAMPLING/ ELEVATION TO WATER PRODUCT (CFU/ (CFU/ 100m1 100m1 NG ft-msl WATER (ft) ELEVATIQN THICKNESS ) ) MONITORI ( ) NW-4 12/10/91 25 90 5.43 20.47 0.00 1300 100 14 62 110 SEQ MW-4 03/25/92 25.90 4 89 21 01 0 00 1400 500 40 210 320 SEQ MW-4 06/25/92 25 90 7 11 19 11' 0 40 -- - -- - --- NA MW-5 02/09/87 --` --- --- --- 41000 2300 2500 --- 6220 --- --- SAL MW-5 09/21/87 --- --- --- --- 18000 790 14 --- 2200 --- --- SAL NW-5 10/20/87 --- ... --- --- 34000 50 ND<O 5 ... 1200 --- --- SAL MW-5 11/20/87 --- --- `-- --- 8700 210 6600 --- 230 ... --- SAL MW-5 03/13/88 25 45 4.73 20 72 -- ... ... --- --- NA MW-5 03/23/88 25 45 4 79 20 66 --- 6200 420 5 --- 600 --- --- SAL MW-5 06/07/88 25.45 4.85 20 60 --- --- --- --- --- --- --- NA MW-5 10/18/88 25 45 5.45 20 00 --- 1300 34 0 9 1 170 ... - SAL MW-5 02/15/90 25 45 4 45 21.00 0 00 1900 220 21 330 250 --- --- SAL MW-5 04/26/90 25 45 4 65 20 80 0.00 --- ... --- ... --- --- --- NA MW-5 07/12/90 25.45 4.72 20 73 0.00 4400 140 9 4 130 300 --- --- SAL MW-5 08/27/90 25.45 5.15 20.30 0 00 --- --- --- --- --- --- --- NA MW-5 11/02/90 25 45 5.20 20 25 0 00 --- - --- --- ... --- --- NA MW-5 11/05/90 25 45 5 21 20 24 0 00 7500 430 55 760 1600 --- --- SAL MW-5 02/25/91 25.45 4.29 21.16 0.00 2400 160 5 9 120 96 --- --- SAL MW-5# 06/27/91 25.45 5.34 20.11 0 00 ND<50 6 7 NU<O 5 ND<O.5 ND<O 5 --- ... CAL MW-5 09/25/91 25 45 5 74 19 71 0 00 1800 120 3.9 79 94 ... --- SEQ MY-5 12/10/91 25 45 5 10 20 35 0.00 720 46 3 4 38 58 >1600 --- SEC MW-5 03/25/92 25.45 4.32 21.13 0.00 550 7.5 0 33 4 0 3.2 1600 <3 8 SEQ MW-5 06/25/92 25.45 NA --- --- --- --- "- --- --- --` --- NA MW-6 02/09/87 ... --- ... --- 13000 100 210 --- 2200 --- --- SAL MW-6 09/21/87 --- --- --- --- 37000 4000 77 --- 4400 --- --- SAL MW-6 10/20/87 --- --- --- --- 5300 210 4 --- 97 --- --- SAL MW-6 11/20/87 --- --- --- --` 270 ND<0 5 1800 --- 9 --- --- SAL MW-6 03/13/88 25 63 4 38 21.25 ... --- --- --- --- --- --- ... NA MW-6 03/23/88 25.63 4 42 21 21 --- 6300 490 6 9 --- 1100 ... --- SAL MW-6 06/07/88 25 63 4.70 20.93 --- --- --- --- --- ... --- NA MW-6 10/18/88 25 63 6 78 18.85 "- 2800 140 43 81 370 --- --- SAL MW-6 02/15/90 25 63 4 25 21.38 0 00 5700 220 21 330 250 --- --- SAL MW-6 04/26/90 25 63 4 50 21 13 0 00 --- --- --- --- --- ---- ... NA MW-6 07/12/90 25 63 4 68 20 95 0 00 14000 590 18 1100 750 --- --- SAL MW-6 08/27/90 25 63 --- ... --- --- --- --- --- --- --- NA 14Y-6 11/02/90 25.63 --- ... --- ... --- --- --- --- `-- --- NA MW-6 11/05/90 25.63 5 02 20.61 0 00 19000 390 17 1200 650 --- `-- SAL MW-6 02/25/91 25 63 4.10 21.53 0 00 6600 310 14 410 110 --- --- SAL MW-6 06/27/91 25 63 5.09 20 54 0 00 17000 260 6 1 140 370 --- --- CAL 30-Jul-92 Page 3 of 7