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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 TPH9 benzene toluene benzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol EDC EDS GW Elevation Elevation Number Date (ug1L) (u L) (u L) (u L) (u /L) (u L) (u ) (u L) (u !L) (u L) (uglL) (u L) (ug&L (ug/L (feet) (feet msl) (feet msl) Comments AS-1 1026199 1700 100 7.7 26 27 5.0 40.50 <0.50 40.50 <5.0 450 200000 5.6 <0.50 60.94 nm nm no odorino sheen screened 03113100 <200 8-0 <2.0 32 -20 11 42.0 <2D <2.0 <20 <0,50 69000 <2.0 <2.0 55,51 nm noodorinosheen interval 06722100 <200 8.3 2.8 3,2 4.2 10 <2.0 <2.D <2.0 420 4200 55000 -2.0 42.0 54.84 nm no odonno sheen 70.5-75.6' 0928/W 200 5.3 1.2 1,9 2.1 10 no no na no no no no na 56.63 nm no odorino sheen 12!22100 96 2.0 1.1 40.50 0.62 32 no no na no no no no no 56.51 nm no odor/no sheen 0312=1 1200 70 220 28 120 <10 na na na na no no no no 56.02 am no ododno sheen 0627101 600 21 43 3.4 3.9 7.7 -0.50 -O,5D -0.50 7.6 <50 13000 1.4 <0.50 56.60 am no odortno sheen 09108!01 610 19 35 14 32 6.8 no no no no no no na no 58.81 nm no odorino sheen 121411 4900 540 350 170 880 <25 no no no no na no no no 59.27 am no odorino sheen 03101102 690 % 33 14 77 5.1 na no no no no no no no 58.55 nm no odor/no sheen 0520102 2000 140 150 43 170 5.0 <0.50 -0.50 <0.50 <5.0 42500 12000 1.3 40.50 58.39 27.93 -30,46 no odorrno sheen 084/0/02 550 21 16 6.5 19 8.0 no no no no no no no no 61.45 33.52 no odor/no sheen 12106102 9800 2000 1300 290 1700 410 no no no no na no na no 61.35 -33,42 odorino sheen 03107103 4700 720 430 110 550 425 no no na no no no na no 60.81 32.86 odorM sheen 0610313 2600 460 280 67 350 4,6 <2,0 <2.0 <2A <20 <200 4000 42.0 <2.0 59.73 -31.80 odorino sheen 082913 <250 8,8 5.8 -2.5 3.7 -25 no no no no no ria na no 61.83 -3390 no odorino sheen 11125103 as as ns ns ns as ns ns as ns ns ns ns ns 62.61 34.66 not sampled 03101104 18000 20 18 <10 <10 <1D <10 <10 -10 <100 41000 1300 410 <10 61.37 -33.44 n0 odor/no sheen Mi 09108198 170000 36000 47000 3300 24000 0.70 <0.50 <0 50 <0.50 <5.0 61 6.8 no no 58.88 nm nm strong odor 7 no sheen screened 12430196 190000 34000 49000 3300 24000 <1000 no no no no no no na no 57.10 nm odor/no sheen Interval 0325199 260000 37000 55000 4800 32000 -5.0 <5,0 <5-0 <5,0 <50 4500 450 no na 55.05 nm no Comment 60'.65' 06103199 120000 20000 26000 3500 23000 <5.0 <5,0 <5.0 <5,0 <50 4500 -50 140 520 54.19 nm no comment 08430199 130000 25000 46000 3900 25000 450 <50 <50 <50 <500 45000 <500 160 620 56.28 nm no comment 12110199 200000 22000 35000 3300 23000 4100 <100 4100 4100 0000 -10,000 42000 160 590 56.42 nm no comment 03103100 180000 23000 36000 2500 18000 <100 4100 4100 4100 41000 <20,0D0 <1000 1500 5800 55.63 nm no odor/no sheen 06422100 190000 2300D 39000 3200 22000 <100 <100 <100 <100 41000 00,000 <11000 130 540 54,16 nm no odor/no sheen 0926100 as as no ns ns ns as ns ns ns as ns as ns nm nm 1222100 190000 29000 42000 2900 20000 -2000 no no no no no no no no 55,82 nm odor 7no sheen 0328101 180000 36000 40000 49W 20000 <500 no no no no na no na no 54.93 nm odor lno sheen 0627101 190000 28000 40000 3900 24000 <2D0 <200 <2D0 4200 <20DD <20D00 14000 290 730 56.43 nm odor Inosheen 09/06Ai 230000 36000 43DDD 3300 20000 <2000 no no no no no no no no 58.60 am odor/no sheen 12/04101 200000 32DOD 41006 3500 23000 <1000 no no no na no no no no 58.91 nm no odortno sheen 03/01N2 230000 29000 37000 3700 24000 <2000 no na no na no no no no 57.74 nm slight odor/sheen 0520102 220000 32000 41000 3600 23000 4200 <2D0 4200 <200 42000 420000 -2000 4200 <200 57.86 27.51 -30.35 no odorino sheen 06430/02 200000 310DO 31000 2600 17000 <1000 no no na na no no no no 60.90 -33.39 odor/slight sheen 12AAM 170000 31000 33000 2800 18000 <25 no no no na na no na na 61.23 -33.72 odor Ino sheen 03A703 210000 35004 45000 3300 21000 42000 no no no no no na no no 60.21 -3270 odor Inosheen 0613103 220000 37000 46000 3500 22000 <100 <100 4100 <100 41000 <10000 <1DD0 390 600 59.21 31.70 odor Ino sheen 082913 230000 35000 33000 3100 21000 <1000 no no no no no no no no 61.30 -33.79 no odorino sheen 1112513 as as ns ns no ns ns he he ns as as no ns 46.36 -18.87 not sampled 03A101 210000 37000 37000 2700 19000 <50 <50 <50 <50 <500 <5000 <500 92 <50 60.96 -33.45 odor/no sheen I I 171q-00.a1a Prnje<t Kb.WA 44 Page 7 of 9 HORIZON ENVIRONMENTAL INC.