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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 TPI-Ig benzenetoluene benzenexylenes MTBE DIPE ETRE TAME TBA methanolethanol EDC EDB GW Elevation Elevation NumberDate (ug/L u IL (u 1L) (u !L) (u IL) u IL) (u IL) ((ug/L (u IL) (ug/L (ug/L (ug/L (u IL) (u 1L) feet feet msl feet msl Comments MW-10 10/26/99 420 0.65 0.94 <0.50 0.88 2.9 <0.50 <0.50 <0.50 7.1 <50 <5.0 2.2 40.50 57.31 25.90 -31.41 no ododno sheen screened 03/03/00 1100 1.1 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 28 <0.50 <5.0 0.98 <0.50 55.32 -29.42 no odorino sheen interval 06/22/00 980 0.85 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 17 <50 <5.0 0.57 <0,50 54.55 -28.65 no odorino sheen 50.5-70.5 09/28/00 970 1.1 <0.50 <0.50 <0.50 <5,0 na na na na na na na na 56.87 -30.97 no odorino sheen 12/22/00 760 0.92 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.08 -30.18 no odorino sheen MW-11 10/26/99 1,600 3.6 0.93 23 1.7 3.1 <0.50 <0.50 <0.50 <5.0 <50 <5.0 24 <0.50 57.72 26.14 -31.58 no odorino sheen screened 03/03100 300 0.8 <0.50 <0.50 <0.50 1.9 <0.50 <0,50 <0.50 <5.0 <0.50 <5.0 4.9 <0.50 55.64 -29.50 no odor/no sheen interval 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm obstruction at 44' 50'-70' 09/28/00 2000 3.8 0.50 29 0.78 <5.0 na na na na na na na na 57.21 -31.07 no odor/no sheen 12/22/00 1100 2.2 <0.50 2.2 0.65 <5.0 na na na na na na na na 56.41 -30.27 no odor/no sheen MW-12 [12122:100 81,000 3,200 17,000 3100 17,000 <2.0 <2.0 <2.0 <2.0 <20 <50 46,000 <50 66 53.51 25.79 -27.72 no odor/no sheen screened 70,000 2800 13,000 2000 11,000 59 <50 <50 <50 <500 <0.50 36,000 <200 <50 55.63 -29.64 no odor/no sheen interval 87,000 2600 14,000 2400 13,000 <20 <20 <20 <20 <200 <2000 39,000 30 <20 54.64 -28.85 no odorino sheen 84'-89' 68,000 7500 3300 2200 7700 <200 na na na na na na na na 56.49 -30.70 slight odorino sheen 27,000 750 4700 190 5500 <200 na na na na na na na na 56.32 -30.53 odor 1 no sheen AS-1 10/26/99 1,700 100 7.7 26 27 5.0 <0.50 <0.50 <0.50 <5.0 <50 200,000 5.6 <0.50 60.94 nm nm no odor/no sheen screened 03/03/00 <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 odor/no sheen interval 06/22/00 <200 8.3 2.8 3.2 4.2 10 <2.0 <2.0 <2.0 <20 <200 55,000 <2.0 <2.0 54.84 nm no odor/no sheen 70.5-75.5' 09128100 200 5.3 1.2 1.9 2.1 10 na na na na na na na na 56.63 nm no odorino sheen 12122100 96 2.0 1.1 <0.50 0,62 32 na na na na na na na na 56.51 nm no odorino sheen VW-1 09!08198 170,000 36,000 47,000 3300 24,000 0,70 <0.50 <0.50 <0.50 <5.0 61 6.8 58.88 nm nm strong odor 1 no Shea screened 12/30/98 190,000 34,000 49,000 3300 24,000 <1000 na na ne na na na 57.10 nm odor Inosheen interval 03/25/99 260,000 37,000 55,000 4800 32,000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 55.05 nm no comment 50'-65' 06103/99 120,000 20,000 26,000 3500 23,000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 140 520 54.19 nm no comment 08/30/99 130,000 25,000 46,000 3900 25,000 <50 <50 <50 <50 <500 <5000 <500 160 620 56.28 nm no comment 12/10/99 200,000 22,000 35,000 3300 23,000 <100 <100 4100 <10o <1000 <10.000 <2000 160 590 56.42 nm no comment 03/03/00 180,000 23,000 36,000 2500 18,000 <100 <100 <100 <100 <1000 <20,000 <1000 1500 5800 55.63 nm no odor/no sheen 06/22100 190,000 23,000 39,000 3200 22,000 <100 <100 <100 <100 <1000 <10,000 <1000 130 540 54.16 nm no odor/no sheen 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm 12!22100 190,000 29,000 42,000 2900 20,000 <2000 na na na na na na na na 55.82 nm odor no sheen i VW-2 03/03100 ns ns ns ns ns ns ns ns ns ns nm ns ns ns nm nm nm dry screened 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 09/28100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 37-47' 12/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry t 474gmr00.x1s 1474.43 Page 4 of 5 HORIZON ENVIRONMENTAL INC.