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I • Ti a GIROUNDWATERl N11TORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl. total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (uglL) (ug1L) (ug1L) (ug1L) (unit.) (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L)(ug1L (feet) (feet msl) (feet msl) Comments MW-1 03131!98 96 40.50 40.50 <0.50 <0.50 <5.0 no no no no no no na no 62.27 26.29 -39.96 screened 06/10198 ns ns ns ns ns ns ns ns ns ns ns no no no 59.59 -33.30 no comment interval 09!08198 no ns ns ns ns no no ns no ns ns ns no no 59.68 -33.39 no comment 76'•90' 1213019& ns ns no no no no no ns no ns ns ns no no 57,70 -31.41 no comment 03125M <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 45.0 no no 55.71 -29.42 no comment 06!03199 <50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <5,0 <50 <5,0 40.50 <0.50 55.13 -28.84 no comment 08/30/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0-50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 57.38 -31.09 no comment 12/10/99 <50 <0.50 <O.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 40.50 57.18 -30.89 no comment 03/03/00 94 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 56.22 -29.93 no odorino sheen 06126!00 130 <0.50 <0.50 46.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 450 <5.0 <0.50 <0.50 55.12 -28.83 no odor/no sheen 09/28/00 240 <0.50 <0.50 40.50 <0.50 <5.0 no no no no no no no no 57.43 -31.14 no odorino sheen 12122100 180 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no na na no no 56.56 -30.27 no odorino sheen 03/26101 180 <0.50 1.5 40.50 1.2 <5.0 no no no no na no no no 55.61 -29.32 no odortno sheen 06127101 350 <0.50 40,50 <0.50 <0.50 <0.50 <0.50 40.50 <0.50 <5.0 <50 <5.0 <0.50 40.50 57.43 -31.14 no odor/no sheen 09!06/01 520 <0.50 0.68 <0.50 1.2 <5.0 na na no no na no no no 59.22 -32-93 no odor/no sheen 12103!01 500 40.50 <0.50 <0.50 <0.50 <5.0 na no no no no na no no 59.91 -33.62 no odor/no sheen 02128/02 790 <0.50 1.8 <0.50 40.50 <5.0 no no no no no no no no 58.48 -32.19 no odor/no sheen 05/20/02 670 40.50 0.64 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 0.55 <0.50 58.76 28.28 -30.48 no odor/no sheen 08/29/02 530 <0.50 <0.50 <0.50 <0.50 <5.0 no no na no no ma no no 61.77 -33.49 no ododno sheen 12/)6/02 740 <0.50 <0.50 40.50 <0.50 <0.50 no no no no no no no no 69.16 40,88 no odorino sheen 03/07/03 910 <o,5D <0.50 <0.50 <0.50 <5.0 no no no no no no no no 61.42 -33.14 no odorino sheen 06/03/03 ism <0.50 <0.50 <D.5D <0.50 <5.0 <0.50 <0.50 <0.50 <5.0 <50 <5.0 4,9 <D.50 60.14 -31.86 no odor/no sheen 08/28/03 ns ns ns no ns ns ns ns ns ns ns ns no no nm nm not sampled 11/25103 ns no ns ns ns no ns ns ns ns no ns ns ns 53.02 -34.74 not sampled 03/01/04 770 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 61.62 26.24 -35.38 no odor/no sheen 06108/04 ns ns no no ns ns ns ns ns ns ns ns ns ns 62.25 -36.01 not sampled MW-2 03/31198 5000 1100 86 71 270 <25.0 no no no no no no no no 61.45 25.42 -36.03 screened 08110/98 ns ns ns no ns ns ns ns no ns ns ns no no 58.76 -33.34 no comment interval 09108/98 no ns no no ns ns no no ns ns no ns no no 58.82 -33.40 no comment 76'-91.5' 12/30198 ns ns no no ns ns no ns ns ns ns ns no no 56.83 -31.41 no comment 03/25199 1600 130 1.7 1.1 50 0.62 <0.50 <0.50 <0.50 6.1 <50 25 no no 54.90 -29.48 no comment 06103/99 14000 8300 730 510 2100 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 28 0.72 54.27 -28.85 no comment 09/30/99 42000 8900 5000 1200 5800 0.62 2.0 <0.50 <0.50 <5.0 <50 <5.0 45 40 56.48 -31.06 no comment 12/10/99 12000 1900 680 330 1200 <5.0 <5.0 <5.0 <5.0 <50 <50 <100 <5.0 <5.0 56.33 -30.91 no comment 03103100 51 DO 1800 33 160 62 45.0 <5.0 <5.0 <5.0 <50 <50 <50 <5,0 <5.0 54.91 -29.49 no odor/no sheen 0622100 22000 5900 530 630 1700 8.5 <5.0 <5.0 <5.0 <50 <500 <200 <5.0 <5.0 54.14 -28.72 slight ododno sheen 09/28100 16000 41 DO Boo 260 1500 <50 na na no na no na no no 56.55 -31.13 slight odor/no sheen 12/221110 6100 1200 120 200 330 <50 na na na na no na no no 55.73 -30.31 slight ododno sheen 03/28101 31000 7600 610 1000 3300 <200 no no no no no no no no 54.69 -29.27 odor/no sheen 0827/01 21000 5800 570 640 2100 <25 <25 <25 <25 4250 <5000 1900 <25 <25 56.48 -31.06 odor/no sheen 09!06101 8900 2000 500 210 840 <100 no na no no no no ne na 58.67 -33.25 odorino sheen 12!04101 28000 6700 1600 910 4000 <250 no no no no no na no no 58.98 -33.56 odor/no sheen 03/01102 57000 12000 1200 1400 6100 <500 no no na no no no no no 57.62 -32.20 odorhio sheen 0520!02 53000 11000 1500 1300 6200 <50 <50 <60 <50 <500 <5000 <5W <50 <5D 57.91 27.44 -30.47 no odorino sheen 0&WM2 51000 9900 3200 1300 6100 <500 no no no no no na no no 60.95 -33.51 odor/no sheen 12106/02 29000 6400 580 770 3300 <25 no no no na no no no no 61.08 -33.64 odorino sheen 03107/03 43000 10000 770 1300 4400 <500 no no na no no no no no 60.28 -32.84 odor/no sheen OW3103 11000 2200 290 310 960 <10 <10 <10 <10 <100 <1000 <100 21 <10 59.09 -31.65 odor/no sheen 06128103 no no ns ns ns ns ns ns no ns ns ns no ns nm nm not sampled 11125/03 ns ns no no ns ns ns no ns ns ns ns ns ns 62.28 -34.84 not sampled 03101104 20000 6100 94 710 1200 <20 <20 420 420 4200 -2000 <200 <20 <20 60.94 25.52 -35.42 odor/no sheen 06108/04 ns ns ns ns no ns ns ns ns ns ns ns no no 61.45 -35.93 not sampled 474amioe.xls Project No.1474.44 Page 1 0(11 HORIZON ENVIRONMENTAL INC.