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TABLE 1 GROUNDWATER MONITORING 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 JETBE TAME TBA methanol ethanol EDC EDS GW Elevation Elevation Number Date (ug/L) (ug1L) (ug/L) (ugfL) (ug/L) jug/Ll (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L)(ug]L (feet) (feet msi) (feet msl) Comments MW-1 03!31!96 96 40.50 40.50 40,50 50.50 45.0 na no no no no na no no 62.27 26,29 -39.98 screened 06/10/98 ns no no no ns ns ns ns no no no ns no no 59.59 -33.30 no comment interval 09108!98 ns ns ns ns ns no no ns n3 no no ns no no 59.68 -33.39 no comment 75'-90' 12 0198 ns ns ns ns ns ns no ns n3 no ns no no no 57.70 -31.41 no comment 0325199 450 40,50 <0.50 40.50 -0.50 -0-50 -0,50 <0,5g 40.50 45.0 <50 45.0 no no 55.71 -29.42 no comment 08103/99 450 40.50 40.50 <0.50 4050 <0.50 -0.50 40,50 -0.50 45.0 450 45.0 40.50 40,50 55.13 •28.84 no comment OBr30199 450 40.50 40.50 40.50 40.50 40.50 -0.50 40.50 40.50 45.0 4513 45-0 <0.50 40,50 57.38 •31.09 no comment 12/10!99 450 40.50 40.50 40.50 40.50 40.50 40.50 40.50 <0.50 45.0 <50 45.0 <0.50 40,50 57.16 -30.89 no comment 03/03100 94 -13.50 40.50 40.50 40.50 40.50 <0.50 40.50 40.50 -5-0 450 45.0 40.50 4030 56.22 -29.93 no odorino sheen 0826100 130 40.50 40.50 40.50 40.50 <0,50 40.50 40.50 40.50 45.0 450 45.0 40.50 <0.50 55.12 -28.63 no odorino sheen 0928100 240 -0.50 -0.50 40.50 40.50 45.0 no no no no no no no na 57.43 -31.14 no odorino sheen 12/22/00 180 40.50 40.50 40.50 40,50 45.0 no no na no no no no no 56.58 -30.27 no odormo sheen 03/28101 180 <0.50 1.5 40.50 1,2 45.13 no no na no no no no no 55.61 •29.32 no odorino sheen 06127/01 350 -0.50 40.50 40.50 40.50 40,50 40.50 50.50 -0.50 45.0 450 45.0 40.50 -0-50 57.43 31.14 no odorino sheen 09108101 520 40.50 0.68 40.50 1.2 45.0 no no no no no no no no 59.22 -32.93 no odor/no sheen 12/03101 500 40.50 40.50 40.50 40.50 45.0 no no no no no no no no 59.91 -33.62 no odorino sheen 02/28102 790 40,50 1.6 40.50 40.50 45.0 no me no no no no no no 58.46 -32.19 no odorino sheen 0500101 670 <0-50 0.64 <0.50 <0.50 <0,50 <0,50 <0.50 40.50 <5.0 <50 45.0 0.55 <0.50 58.76 28.28 -30.48 no odorino sheen 0829102 530 40.50 40.50 <0.50 -0.50 45.0 no no no no no no no no 61.77 -33.49 no odorino sheen 12106102 740 40.50 -0.50 40.50 40.50 4050 na no no no no no no no 69.16 -40.88 no odormo sheen 03/07103 910 40.50 <0.50 40.50 40.50 45.0 no no no no no no no na 61.42 -33.14 no odorino sheen 06!03103 1800 40.50 -0.50 40.50 40.50 4$,0 40,50 40.50 40.50 45.0 450 45.0 4.9 40.50 60.14 -31,66 no odorino sheen 0828103 ns no no no no no no no no no ns ns ns ns nm nm not sampled 1125103 ns no no ns ns no no ns no ns ns ns ns no 6302 -34.74 not sampled MW-2 03/31198 5000 1100 86 71 270 425.0 no no no no no no no no 61.45 25.42 -36.03 screened 08/10198 no. ns no no no. ns no as ns ns ns ns na no 58.76 -33.34 no comment Interval 09108798 ns no ns hs no. no ns no ns no ns no no no 58.82 -33,40 no Comment 76'-91.5' 12130198 Its ns no no no no ns no no ns ns ns no no 56,83 •31.41 no comment 0325199 1600 130 1.7 1.1 50 0.62 40.50 40.50 <0.50 6.1 -50 25 no no 54.90 -29.48 no comment 06103199 14000 8300 730 510 2100 -0.50 <0.50 40.50 <0.50 45.0 -50 45.0 28 0-72 54,27 •28.85 no comment 08/30/99 42000 89W 5000 1200 5800 0.52 2.0 40.50 40.50 -5.0 450 45.0 45 40 56.48 -31.06 no comment 12110!99 12000 1900 680 330 1200 45.0 45.0 45.0 45.0 450 450 4100 45.0 450 56.33 -30.91 no comment 03/03/00 5100 1800 33 160 62 <5,0 <5.0 <5.0 45.0 450 450 450 <5.0 <5.0 54.91 •29.49 no odor/no sheen 0622/00 22000 5900 530 630 1700 8,5 45.0 45.0 45.0 450 4500 4200 45.0 -5.0 54.14 -28.72 slight odorino sheen 0928100 16000 4100 8013 260 1500 450 no no no no no no no no 56.55 -31.13 slight odorino sheen 1222100 6100 1200 120 200 330 450 no Its no no no no na no 55.73 -30,31 slight odor/no sheen 0328101 31000 7600 610 1000 3300 4200 no no no no no no no no 54.69 -29.27 odor/no sheen 06!27101 21000 5800 570 640 2100 425 <25 425 425 <250 45000 1900 425 425 56.46 -31.08 odor/no sheen 09/08/01 8900 2000 500 210 840 4100 no no no no no no no no 58.67 -33,25 odor/no sheen 12/04/01 28000 6700 1600 910 4000 4250 no no na no no no no no 58.98 -33,56 odor/no sheen 03/01/02 57000 12000 1200 1400 6100 <500 no na no no no no no no $7,62 •32.20 odor/no sheen 0520102 53000 11000 1500 1300 6200 450 450 450 450 -500 45000 <500 450 450 57.91 27.44 -30.47 no odor/no sheen 08/30/02 51000 9900 3200 1300 6100 4500 no no no no no no no no 60-95 •3351 odorino sheen 12/06102 29000 6400 580 770 3300 425 no no no no no no no no 81.08 -33.64 odorino sheen 03/07/03 43000 10000 770 13W 4400 -500 no no no no no no no na 60.28 -32,84 odor/no sheen 08103103 11000 2200 290 310 960 00 410 410 410 4100 41000 4100 21 410 59.09 -31,65 odorino sheen 0828/03 ns ns no ns ns ns ns ns ns ns no ns ns ns nm nm not sampled 1125703 no ns ns ns ns ns ns ns ns no no no no no 82.28 -34,84 not sampled 4744mr00.K1s PioiM No.1474.44 Page 1 ol9 HORIZON ENVIRONMENTAL RFC.