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<br /> TABLE 1
<br /> GROUNDWATER MONITORING DATA
<br /> Beacon Station No. 12474
<br /> 3440 East Main Street,Stockton,California
<br /> ethyl- total Depth to TOC GW
<br /> Well TPHg enzene toluene benzenexylenes MTBE RIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation
<br /> Number Datel(ug/L) (ug/L (ug/L (ug/L (ug/L (u !L) ((ug/L u IL u IL u 1L u IL (ug/L (ug/L u IL feet feet msl feet msI Comments
<br /> MW-10 10126199 420 0.65 0.94 <0.50 0.88 2.9 <0.50 <0.50 <0.50 7.1 <50 <5.0 2.2 <0.50 57.31 25.90 31.41 no odor sheen
<br /> screened 03103100 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
<br /> 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 odor/no sheen
<br /> 50.5-70.5 09128100 970 1.1 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 56.87 -30.97 no odor/no sheen
<br /> 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 odor/no sheen
<br /> 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
<br /> interval 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm Obstruction at 44'
<br /> 50'-70' 09/28100 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
<br /> MW-12 10/26/99 81,000 3,200 17,000 3100 17,000 <2.0 <2.0 <2.0 <2.0 <20 <50 46,000 <50 65 53.51 25.79 -27.72 no odorino sheen
<br /> screened 03103/00 70,000 2800 13,000 2000 11,000 59 <50 <50 <50 <500 <0.50 36,000 <200 <50 55.63 -29.84 no odor/no sheen
<br /> interval 06/22100 87,000 2600 14,000 2400 13,000 <20 <20 <20 <20 <200 <2000 39,000 30 <20 54.64 -28.85 no odor/no sheen
<br /> 84'-89' 09/28/00 68,000 7500 3300 2200 7700 <200 na na na na na na na na 56.49 -30.70 slight odor/no sheen
<br /> A5-1 10126199 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 no odor/no sheen
<br /> 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 no odorino sheen
<br /> 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 no odor/no sheen
<br /> 70.5-75.5' 09/28100 200 5.3 1.2 1.9 2.1 10 na na na na na na na na 56.63 no odor/no sheen
<br /> VW-1 09108/98 170,000 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 no sheen
<br /> screened 12/30/98 190,000 34,000 49,000 3300 24,000 <1000 na na na na na na 57.10 nm odor!no sheen
<br /> interval 03125199 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
<br /> 50'-65' 06/03/99 120,000 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
<br /> 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
<br /> 12/10/99 200,000 22,000 35,000 3300 23,000 <100 <100 <100 <100 <1000 <10,000 <2000 160 590 56.42 nm no comment
<br /> 03103/00 180,000 23,000 36,000 2500 18,000 <100 <100 <100 <100 <1000 <20.000 <1000 1500 5800 55.63 nm no odor/no sheen
<br /> 06/22/00 190,000 23,000 39,000 3200 22,000 <100 <100 <100 <100 <1000 <10,000 <1000 130 540 54.16 nm no odorino sheen
<br /> 09128/00 ns ns ns ns ns ns ns AS ns ns ns ns ns ns nm nm
<br /> VW-2 03/03/00 ns ns ns ns ns ns ns ns ns ns nm ns ns ns nm nm dry
<br /> screened 06122/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry
<br /> interval 09/28/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm
<br /> 37'-47'
<br /> 474gmr00.xls
<br /> 1474.43 Page 4 of 5 HORIZON ENVIRONMENTAL INC.
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