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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total I Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug/L) (uglL) (ug/L) (ug/L) (ug/L) (ug1L) (ug/L) (ug/L) (ug1L) (ug/L) (u91L) (ug1L) (ug1L) ug/L (feet) (feet ms1) (feet mel) Comments MW-10 1026199 420 0.65 0.94 40.50 0.86 2.9 <0.50 <0.50 40.50 7,1 <50 45.0 2.2 <O.50 57.31 25,40 -31.41 no odor/no sheen screened 03103100. 1100 1.1 <0.50 <0.50 40.50 <0.50 40.50 <0.50 <0.50 28 <0.50 <5.0 0.98 <0.50 55.32 -29.42 no odor/no sheen Interval 0622100 980 0.85 <0.50 <0.50 <0.50 1 <0.50 <0.50 <0.50 <0.50 17 <50 <5.0 0.57 <0.50 54.55 -28.65 no odor/no sheen 50.5.70.5 09/28100 970 1.1 <030 40,50 <0.50 <5.0 no no no no no no no no 56.87 -30.97 no odor/no sheen 1222100 760 0.92 <0.50 <0,50 <0,50 <5.0 no no no no no no no no 56,08 -30,18 no odorino sheen 03/28101 800 1.4 4.4 0.55 2.9 <5.0 no no no no no no no no 55.09 -29.19 no odorino sheen 06!27101 420 <0.50 40.50 <0,50 <0.50 <0,50 <O.50 <0.50 <0.50 7.5 <50 <5.0 <0.50 <0.50 56,58 .30,68 no Marino sheen 09A)SIOI 350 40.50 <0,50 <0.50 <0.50 <5,0 no no no no no no na no 58.61 32.71 no odor/no sheen MW-11 10126!99 1,600 3.6 0.93 23 1.7 1 3.1 <0.50 <0.50 <0.50 <5.0 <50 <5,0 24 40.50 57.72 26.14 -31.58 no odorfio sheen screened 03103100 300 0.8 <0.50 <0.50 <0.50 1.9 <0.50 <O.50 <0.50 <5.0 <0.50 <5.0 4.9 <0.50 55,64 -29.50 no odor/no sheen Interval 0822100 ns ns ns ns ns rta ns ns ns ns ns ns ns ns nm nm obstruction at 44' 50'-70' 09!28100 2000 3.8 0.50 29 0.76 <5.0 no no no no no not no no 57.21 -31.07 no odorino sheen 12/22/00 1100 2.2 40.50 2.2 0.65 <5.0 no no no no no no no no 56.41 -30.27 no odortno sheen 0328101 1200 0.98 40.50 8.6 0.62 <5.0 no no no no no na no no 55.66 -29.52 slight odor/no sheen 06/27u01 15W 1.3 <0.50 12 <0.50 40.50 <0.50 <0.50 <0.50 <5.0 450 <5.0 67 <0.50 56.92 -30,78 slight odor/no sheen 09/06/01 950 2.6 1.8 8,7 3.9 <5,0 no no no no na no no no 58.98 -32.84 noodor/nosheen MWA2 1026V99 81,000 3,200 17,000 3100 17,000 <2.0 <2.0 <2.0 <2.0 <20 <50 46,000 1 <50 66 53.51 25.79 -27.72 no odor/no sheen screened 03=03=00 70.000 28W 13,000 2000 11,000 59 <50 <50 <50 <500 <0.50 38,000 <200 <50 55.63 -29.84 no odor/no sheen interval 0822100 87,000 2600 14,000 2400 13,000 c20 <20 <20 <20 <200 <2000 39,000 30 <20 54.64 -28.85 no odorino sheen 092600 68,000 7500 3300 2200 7700 <200 no no na no no na no no 56.49 -30,70 slight odortno sheen 1222/00 27,000 750 47W 190 5500 <200 no no no no no na no no 56.32 -30,53 odor/no sheen 03128MI 67,000 2400 11000 2100 12000 <200 no no no no no na no no 55.20 -29,41 odor/no sheen 0627=1 93.000 5800 15000 2900 16000 450 <50 450 450 <500 45000 60.000 240 150 56.45 -30.86 odor 1110 sheen 09106!01 80.000 7100 9500 2400 13000 <250 no no no no no no no no 58.30 -32.51 odor 1no sheen AS-1 10261991,700 100 7.7 26 27 5,0 c0.50 <0.50 <0.50 <5.0 <50 200,000 5.6 <0.501 60,94 nm nm no odorino sheen screened 03103100 <200 8.0 <2.0 3.2 <2.0 11 <2.0 <2.0 <2.0 <20 <0.50 69,000 <2.0 <2.0 55.51 nm no odorino sheen Interval 06122100 <200 83 2.8 3.2 4.2 10 42.0 <2.0 <2.0 <20 <200 55,000 42.0 <2.0 54.84 nm noodorMoshoen 70.5-75.5' 0928100 200 5.3 1.2 1.9 2.1 10 no no no no no no no no 58.63 nm no odor/no sheen 122710(} 96 2.0 1.1 40.50 0.62 32 no no no no no no no no 56.51 nm no odor/no sheen 63/28/01 1.200 70 220 28 120 410 na no na no na no no no 56.02 nm no odor/no sheen 0827101 600 21 43 3.4 3.9 7.7 40.50 40.50 40.50 7.6 <W 13,000 1.4 <0.50 56.80 nm no odor/no sheen 09/06101 610 19 35 14 32 6.8 no no no na no no no no 58.81 nm no odorino sheen I vw-1 09!0&98 170,000 36.000 47,000 3300 24,000 0,70 <O.50 <0.50 40.50 <5.0 61 6.8 i 58.88 nm nm strong odor/no show screened 12MOM 190.000 34,000 49,000 3300 24900 <1000 no no no no no no 57.10 nm odorinosheen Interval 03125199 260,000 37,000 55,000 48W 32,000 <5.0 <5.0 45.0 <5.0 <50 <50g <50 55.05 nm no comment 50'-65' 1 08103199 120.000 20,000 26,000 3500 23,000 45.0 <5.0 <5,0 <5.0 450 4500 <50 140 520 54.19 nm no oarrvnenl 08/30/99 130,000 25,1x10 48.000 3900 25,000 450 450 450 450 <500 45000 <500 160 620 56.28 nm no comment 12/1 Ol99 200,000 22,000 35,000 3300 23,000 <100 <100 <100 <100 <1000 <10,000 <2000 160 590 56.42 nm no carvnent 03=3100 180,000 23.000 36,000 25W 18,000 <100 <100 <100 <100 <1000 <20,000 <1000 1500 5800 55.63 nm no odor/no sheen 0622100 190,000 23,000 39,000 3200 22,000 <100 4100 <100 <100 <1000 <10,000 <1000 130 540 54.16 nm no odor/no sheen 0928100 no ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm 12/22/00 190.000 29.000 42,000 29W 20,000 <2000 no no no no no no no no 55,82 nm odor 1 no sheen 03118/01 180,000 36.000 40.000 4900 20,000 <500 no no no no no no no no 54.93 nm odor l no sheen 06127101 190,000 28,000 40,000 39W 24,000 <200 <200 <200 4200 <2000 <20000 14,000 290 730 56.43 nm odor!no sheen 09=601 230.000 36,000 43,000 3300 20,000 <2000 no no no no no no no no 56.60 nm odor Ino sheen 4T4gmN0.#r PMOd No.1474.44 Page 4 of 6 HORIZON EMRONIEZN'AL INC.