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• 0 i t 3 TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPH9 benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevatlon Number Date (ug/L Jug/L)( (ug/L u 1L {u !L (ug/L (u It) ((ug/L u IL u lL u !L u !L u !L u !L (feet) feet ms1 feet msl Comments MW-5 03/31/98 150 10.50 10.50 10.50 <D_50 15.0 na na na na na na 61.11 25.11 -36,00 screened 06/10/98 150 <0.50 <0.50 10.50 <0.50 15.0 na na na na na na 58.41 •33.30 n6 odor/no sheen interval 09/08/98 <50 10.50 10.50 10.50 <0.50 <0.50 10.50 10.50 10.50 <5.0 150 15.0 58.41 -33.30 1 no odor!no sheen 65'-86.5' 12!30198 <50 10.50 2.5 0.89 5.6 15.0 na na no na na na 56.51 -31.40 no odor 1 no sheen 03125199 <50 10.50 10.50 <0.50 10.50 <0.50 <0.50 10.50 <0.50 <5,0 150 <5,0 54,54 -29.43 n000mment 06!03199 <50 10.50 10.50 <0.50 10.50 10.50 10.50 10.50 <0.50 <5,0 150 15,0 10.50 10.50 53.89 -28.78 no comment 08/30/99 95 1.7 7,4 2.1 15 <0.50 <0.50 <0.50 10.50 15.0 <50 <5.0 10.50 <0.50 56 A4 -30.93 no comment 12!10199 <50 10,50 <0.50 10.50 <0.50 <0.50 10.50 10.50 <0.5D 15.0 150 <5,0 10.50 10,50 55.99 -30.08 no comment 03103100 <50 10.50 0.51 10.50 0.92 10.50 <0.50 <0.50 10.50 15,0 150 6.0 10,50 10.50 54.53 49.42 no odorino sheen 06/22100 <50 <0.50 <0 50 10.50 <0.50 10,50 10.50 <0.50 <0.50 15.0 150 24 <0.50 10.50 53.75 -28.64 no odor/no sheen 09!28100 150 <0.50 <0.50 <0.50 10.50 15,0 na na na na na na na na 56.19 -31.08 no odorino sheen 12!21100 <50 10.50 10.50 10.50 10.50 15,0 na na na na na na na na 55.32 -30.21 no odorino sheen 03/28/01 78 2.5 14 2.1 11 15.0 na na na na na na na na 54.44 -29.33 no odor/no sheen 06/27101 <50 10.50 0.68 10.50 10.50 <0 50 <D.50 10.50 10.50 <5.0 <50 15.0 <0.50 10.50 55.139 -30.78 no odor/no sheen 09/06/01 150 0.64 1.1 0.70 2.0 <5.0 na na na na na na na na 57.95 -32.85 no odor/no sheen 12/03701 150 10.50 1.1 <0.50 10.50 <5,0 na na na na na na na na 58.45 -33,34 no odor/no sheen 02128!02 <50 <0,50 0.55 <0.50 <0.50 <5.0 na na na na na na na na 57.31 -32,20 no odor/no sheen 05/20102 220 11 14 6,4 31 10.50 10.50 10.50 <0.50 15.0 <50 15.0 10.50 10.50 51,53 27.10 -30,43 no odor/no sheen MW-6 03!31198 78000 23000 8500 1100 6300 <500 na na na na na na 61,43 25.44 •35,99 reported as MW-2A screened 06!10198 120000 23000 17000 1600 15000 1500 na no na na na na 58,69 33,25 reported as MW-2A Interval 09/08198 120000 30000 20000 2300 18000 1050 10.50 10.50 10.50 15.0 150 15.0 58.77 -33,33 odor Inosheen 56'-76' 12130198 71000 20000 6500 1900 11000 1250 na na na na na na 56115 -31.41 slight odor!no sheen 03/25199 48000 15000 1800 910 5100 <0.50 <0.50 <0.50 10.50 20 <50 56 54.86 -29.42 no comment 06/03199 33000 9600 2500 1100 54DD <5,0 15.0 15.0 15,0 <50 1500 150 15,0 10 54.14 -2870 no comment 08130/99 51DD0 1 7200 5400 2400 11000 42 120 120 120 <200 <2000 <200 32 56 56.32 -30.88 no Comment 12!10!99 67000 13000 2400 1800 9500 <20 <20 120 <20 1200 <50 1200 68 46 56.29 -30.85 no comment 03/03700 28000 6000 2B0 570 3600 <20 <20 <20 <20 1200 <50 <200 <20 <20 54.89 -29.45 no odorino sheen 06/227170 26000 6500 570 710 2900 <10 110 110 <10 1100 <1000 1100 <10 <10 54.11 -28.67 slight odor 1 no sheen 09128100 30000 920 5300 830 6900 15.0 na rte no na na na na na 56.47 -31.03 slight odorino sheen 12122!00 55000 9600 950 1600 8300 <200 na na na na na na na na 55.72 •30.28 odor lno sheen 03!21310192000 15000 6600 2800 13000 150 na na na na na na na na 54.68 -29.24 odorino sheen 06127101 86000 15000 8900 2600 12000 150 <50 150 150 <500 <500D <1000 94 130 56.17 •30.73 odor I no sheen 09/06/01 95000 17000 11000 2600 12000 1500 na na na na na na ne na 58.24 -32.76 odor l no sheen 12!04101 74D00 14000 4600 2300 10000 <5oo na na na na no na na na 58.81 -33.37 odor Ino sheen 03101/02 9DDD0 13000 8300 2700 12000 <500 na na na na na na na na 57.61 -32.17 odor lno sheen 05720102 61000 14000 6200 2100 10000 1100 1100 <100 <100 11000 <10000 11000 0D0 <100 57,85 27.39 -30.46 odor lnosheen MW-7 03/31198 <50 10.50 <0.50 10.50 10.50 <5,0 na na na na na na 61,75 25.66 •36.09 screened 08/10198 150 10.50 10.50 10.50 <0.50 15,0 na na na na na na 59 04 -33 38 no odor I no sheen Interval 09108198 <5D 10.50 10.50 10.50 10.50 10.50 10.50 10.50 10.50 15,0 150 15,0 59,19 -33.53 no odor I no sheen 56'-76' 12!30198 <50 10.50 <0,50 10.50 10.50 -50 na na na na na na 57.18 -31.52 no odor/no sheen 03125/99 150 10.50 10,50 10.50 <0.5D 10.50 <0.50 10.50 10.50 <5.0 <5D 15.0 55,07 -29,41 no comment 06103799 <50 10.50 10.50 <0.50 10.50 <0.50 10,50 <0.50 <0.50 15.0 <50 15.0 5.6 10.50 54.61 -28.95 no comment 08130/99 <60 <0.50 10.50 10.50 10.50 <0.50 10,50 <0.50 <0.50 15.0 150 <5.0 2.1 10.50 5685 -31.19 no comment 12110!99 <50 10,50 10.50 10.50 10.50 0.50 10.50 <0.50 <0.60 15.0 150 <5.0 4.7 10,50 56.68 -31.02 no comment 03/03/00 150 <0.50 10.50 10.50 <0.50 0,62 10.50 10,50 10.50 <5.0 150 <5.0 5.0 10.50 55.64 -29.95 no odor/no sheen 06/26100 <50 10,50 10.50 <0,50 <0,50 <0.50 10.50 10.50 10.50 15,0 <50 9,4 4.0 10.50 54.62 -28.96 no odorino sheen 09128100 <50 10.50 <0.50 <0,50 <0,50 15.0 na na na na na na na na 56.93 -31.27 no odorino sheen 10120100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 24.73 nm wellhead re-surveyed 12122MO ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm no odorino sheen 03!28101 73 6.2 17 1.5 7.5 <5.0 ns ns ns ns ns ns ns ns 54.73 -30.00 no odorino sheen 06727/01150 10.50 1.0 <0 50 <0.50 0.87 <0.50 <0.50 10.50 <5 0 150 <5.0 6,0 <0.50 55.99 -31.26 no odor/no sheen 09106/01 <50 10.50 <0.5D 10.50 10.50 15,0 na na no na na na na na 5803 -33.30 no odor/no sheen 12103701 <50 <0.50 10.50 <0.50 10.50 15.0 na na na na na na na na 58.41 •33,68 no odor/no sheen 0208102 <50 10.50 10.50 10.50 10.50 <5.0 na na na na na na na na 57.13 32.40 no odor/no sheen 05/20/02 51 10.50 1.9 <0.50 10.50 0.92 10.50 10.50 10.50 15.0 150 15.0 15 10.50 57.55 25.94 -30,61 no odorino sheen 474amr00 x10 Profed No 1474 44 Page 3 of 7 HORIZON ENVIRONMENTAL INC.