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Table I-Groundwater Monitoring Data - Beacon Station No.474 3443 East Main Street,Stockton,California -y Well Date TPHg B T E X MTBE DIPE ETRE TAME TBA Meth Eth Depth to TOC GW NumbeMW-1r GW Elevation Elevation Comments MW-1 03/31/98 96 <0.50 <0.50 <0.50 40.50 <5.0 na na na na na na 62.27 26.29 -39.98 screen 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns 59.59 -33.30 no comment Interval 09/08/98 ns ns ns ns ns as ns as ns ns ns ns 59.68 -33.39 no comment V-90' 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns 57.70 -31.41 no comment 03/25/99 <50 <3.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 45.0 55.71 -29.42 no comment MW-2 03/31/98 5,000 1,100 86.0 71.0 270 <25.0 na na as na na na 61.45 25.42 -36.03 screen 06/10/98 ra " ns ns ns ns ns ns ns ns ns ns ns 58.76 -33.34 no comment Interval 09/08/98 ns as ns ns ns ns ns ns ns its ns ns 58.82 -33.40 noeomment 76'-91.5' 12130/98 ns ns ns ns ns ns ns ns ns ns ns ns 56.83 -31.41 no comment 03/25/99 1,600 130 1.7 1.1 50 0.62 <0.50 <0.50 <0.50 6.1 <50 25 54.90 -29.48 no comment MW-3 03/31/98 72 <0.50 <0.50 <0.50 IC50 <5.0 na na na na na na 61.53 25.54 -35.99 screen 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns 58.85 -33.31 no comment Interval 09/08/98 ns n3 ns ns ns ns ns ns ns ns ns ns 58.94 -33.40 no comment 75'-90' 12130/98 ns ns ns ns ns ns ns ns ns ns ns ns 56.96 -31.42 no comment 03/25/99 73 40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 55.01 -29.47 no comment MW-4 03/31/98 ns ns ns ns ns ns ns ns ns ns ns ns nm 25.15 nc not located screen 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns mn nc not located Interval 09/08198 ns ns ns ns ns ns ns ns ns ns ns ns tum nc not located 65'-86' 12/30/98 Its ns ns ns ns ns ns ns ns ns ns ns nm ne Paved over 03/25/99 ns ns ns ns ns ns ns ns ns ns ns ns nm ne Paved over MW-5 03/31/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 61.11 2511 -36.00 screen 06/10/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 58.41 -33.30 no odor/no sheen Interval 09/08/98 <50 ®.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 58.41 -33.30 no odor/no sheen 65'-86.5' 12/30/98 <50 <0.50 2.5 0.89 5.8 <5.0 na na na na na na 56.51 -31.40 no odor/no sheen 03/25/99 <50 <0.50 <0.50 ®.50 <0.50 i <0.50 <0.50 <0.50 40.50 <5.0 <50 45.0 54.54 -29.43 no Comment MW-6 03/31/98 78,000 23,000 8,500 1,100 6,300 1 <500 na na na na na na 61.43 25.44 -35.99 reported as MW-2A screen 06/10/98 120,000 23,000 17,000 1,600 15,000 <500 na na na na na na 58.69 -33.25 reported as MW-2A Interval 09/08/98 120,000 ' 30,000 20,000 2,300 18,000 <D.50 <0.54 <0.50 <0.50 <5,0 <50 <5A 58.77 -33.33 odor f no ahem 56'-76' 12/30/98 71,000 ' 20,000 6,500 1,900 11,000 <250 na na na na na na 56.85 -31.41 slight odor/no sheen 03/25/99 48,000 15,000 1,800 910 5,100 <0.50 <0.50 <0.50 <0.50 20 <50 56 54.86 -29.42 no comment MW-7 03/31/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 61.75 25.66 -36.09 screen 06/10/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 59.04 -33.38 no odor/no sheen Interval 09/08/98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 59.19 -33.53 no odor lnosheen 56'-76' 12/30/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 57.18 -31.52 no odor/no sheen 03/25/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 55.07 -29.41 no comment 4 99QMTab1e.Q1 Page 1 of 2 HORIZON ENVIRONMENTAL INC.