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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 TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC ED8 GW Elevation Elevation Number Date (uglL) (ug/L) (ugll-) (uglL) (uglL) (ug/L) (uglL) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ugll-) (uglL) (feet) feet msi MW-4 03/31/98 ns ns ns ns ns ns ns ns ns ns ns ns ) ( } [feet mal) Comments screened 06/10/98 ns. ns ns ns ns ns ns ns ns ns ns ns nm 25.15 nm not located interval 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns nm nm not located 65'46' 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns nm nm not located 03/25/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm °m Paved over 08/30/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 72/10/99 ns ns ns nm paved over ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 03103/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 06/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm paved over 09/28/00 <50 c0.5o <a.sD <0.50 <0.50 <5.0 na na na na na na na na 56.16 nm paved over 12/21/00 <50 <0.50 <0.50 <0.50 <0.50 <5,0 na na na na na na na na 55.28 -31.01 no odor/no sheen 03/28101 <50 1.1 5.8 0,93 4.5 <5.0 na na na na na na na na 54.41 -30.13 no odor/no sheen -29.26 no odor/no sheen MW-5 03/31/98 <50 <0.50 <0.50 <0.50 <0.50q5O a na na na na na screened103/25/99 08110/88 <50 <0.50 <0.50 <0.50 <0.50a na na na na na 61.11 25.11 -36.00 Interval 09/08/98 <50 <0.50 <0.50 <0.50 <0.50 .50 <0.50 <0.50 <5.0 <50 <5.0 58.41 -33.30 no odor 1 no sheen 65'-86.5' 12/30/98 <50 <0.50 2.5 0.89 5.8 56.41 -33.30 no odor/no sheen a na na na na na 56.51 -31.40 no odor!no sheen <50 <0.50 <O.Sp <0,50 <0,50 .50 <0.50 <0,5a <5.0 c50 <5.0 06/03/99 <50 <0.50 <0.50 <0.50 <0.5050 <0.50 <0.50 <5.0 <50 < 53'89 -29.43 no comment 08130/98 95 1.7 7.4 5.0 <R50 c0.50 53.88 -28.78 no comment 2.1 15 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 56.04 -30.93 no comment 12110!99 <50 <0.50 <0.50 <0,5a <0,50 <Q.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 55.99 03/03/00 <50 <0.50 0.51 <0.50 0.92 <0.50 <0.50 <0.50 <0.50 <5,0 <50 6.0 <0 -30.68 no comment 06/22/00 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 24 < .50 <0.50 54.53 -29.42 no odor/no sheen Q5p <0 53.75 -28.64 no ododno sheen 09/28/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na naa 56.19 12M/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na na 55.32 -31.08 no odor/no sheen 03/28/01 78 2.5 14 2.1 11 <5.0 na na na na na na na na 54.44 -30.21 no odor sheen -29.33 no odor/no no sheen tiAll4f�i 03!31198 78,T-] ().0 ,000 8500 1100 63D0 <500 na na na na na na screened 06!10198 120 ,000 17,000 1600 15,000 <540 na na na na na na 61.43 2544 35.99 reported as MVII-2A interval 09/08/98 120 , 00 200 2300 18,000 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 58.69 -33.25 reported o sheen56'-76' 12/30/98 71, ,000 6500 1800 11,000 <250 na na r.a na na na 58.77 33.33 odor!no sheen03/25/99 48, ,000 1800 910 5100 <0.50 <0.50 <0.50 <0.50 20 <50 56 56.85 31.41 Slight odor l no sheen 06/03/99 33, 600 2500 1100 5400 <5.0 c 54.86 -29.42 no comment 5.0 <5.0 <5.0 <50 <500 <50 <5.0 10 54.14 -26.70 no comment 08/30/99 51,000 7200 5400 2400 11,000 42 <20 <20 <20 <200 <2000 <200 32 56 56.32 12/16/99 67,000 13,000 2400 1800 9500 <20 <20 <20 c -30.85 no comment 20 <200 <50 03103/00 28,OOD 6000 280 570 3600 <20 <20 <20 < <20020 <200 <50 <200 <2 46 56.29 -30.85 na comment 20 <2a 54.89 -29.45 no odvrino sheen 06122/00 26,000 6500 570 710 2900 <10 <10 <10 <10 <100 <1000 <100 <10 <10 54.11 09/28/00 30,000 920 5300 830 6900 <5.0 na na na na na na na na 56,47 -28.67 slight odor 1 no sheen 12122100 55,000 9600 950 1600 8300 <200 na na na na na na na na 55.72 -31.03 slight odor/no sheen 03/28/01 92,000 15000 6600 2800 13000 <50 na na na na na na na na 54.66 -30.28 odor 1 no sheen -29.24 odor lna sheen t 474gnvW.)ds Projea No.1474.44 Page 2 of 5 HORIZON ENVIRONMENTAL INC.