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ti :.:;,� TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPS ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (ugn) (ugA} (ugA) (ug/) (ugA) (ug/1) (ugn} (ugn) (feel) {feet msly (feet msq Comments sW-1 10102197 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 56.57 nm nm not sampled screened 03131!98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns b 51.23 nm not sampled interval 06110198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 45.84 nm not sampled 60'-65' 09108/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.26 nm not sampled 12/30198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 43.99 nm not sampled 03/25199 90 <0.50 0.71 <0.50 0.53 71 <0.50 <0,50 0.55 <5.0 <50 <5.0 ns ns 41.95 nm slight odor I no sheen 06/02199 130 0.89 <0.50 .40.50 <0.50 130 <0.50 <0.50 <0.50 <5.0 <50 <5 0 .40.50 .40.50 42.24 nm slight odor I no sheen 08/31199 1000 150 53 45 31 1400 <0.50 <0.50 0.65 54 <100 <5A <0.50 <0.50 47.81 nm no comment 12/09/39 53 <0.50 <0.50 <0.50 <0.50 500 40.50 <0.50 <0.50 5.4 <50 <5.0 <0.50 <0.50 44.60 nm no comment 03101/00 <200 <2.0 42.0 <2.0 <2.0 560 <2.0 42.0 <2.0 <20 <300 420 na na 42.38 nm no comment 06/06/00 60 2.2 <0.50 <0.50 .40.50 510 <0.50 <0.50 <0 50 28 <200 <5.0 <0.50 <0.50 41.79 nm clear 09114/00 940 95 5.8 53 3.6 3100 42.0 <2.0 <2.0 76 <250 <20 <2.0 <2.0 4790 nm clear 12/12/00 <200 <2.0 <2.0 <2.0 <2.0 1900 ne na na na na na na na 43.99 nm clear 03/19/01 <100 <1.0 <1.0 41.0 <1.0 470 na na na na na na na na 41.96 nm dear 06119/01 <100 12 10 2.4 6.0 540 na na na ne na na na na 45.15 nm clear 09/27101 520 <2.0 2.4 13 95 2000 ne na na na na na na na 49.95 nm clear 12/13/01 <250 <2.5 42.5 <2.5 7.3 1600 na na na na na na na na 46.16 nm clear 03128/02 <500 <5.0 <5A <5.0 <5.0 1900 ne na na na na na na na 42.98 19.24 -23.74 Gear 6/19/2002 630 160 17 52 25 1700 na ne na na na na na na 45.70 -26.46 clear 9116/2002 770 82 6.4 77 15 2100 <5.0 <5.0 45.0 59 <500 <50 <5.0 <5.0 50.72 -31-48 cloudy 12/26/2002 <1000 <10 410 <10 12 2600 na na na na rte na na na 47.03 -27.79 cloudy 3/26/21703 520 51 71 7.1 36 2000 ne ne na na 1ta na na ne 44.83 •25.59 dear 06127/03 1800 550 13 89 13 4200 410 410 <10 <100 <1000 .4100 <10 na 47.80 -28.56 dear 09119/03 570 60 <5.0 9.2 45.0 2900 na ne na na na na na na 54.16 -34.92 dear 12130103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.25 -30.01 clear 03/26/04 <500 <3.0 <3.0 <3.0 <3.0 1500 <3.0 43.0 <30 <50 <500 450 <3.0 na 47.20 -27.96 clear 06117/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.90 -32.66 not sampled 09/09/04 13000 150 <10 <10 53 2900 <10 <10 <10 1002 <1000 <100 <10 na 57.06 -37.62 dear VW-1 03/25/99 20000 4000 2000 900 1700 3000 45.0 <5.0 <5A <5.0 <50 640 na na 41.70 nm nm slight odor Inosheen screened 06/02199 23000 5800 23,00 1100 1900 8300 <5.0 <5.0 <5.0 240 <100 <10 <5.0 <5.0 42.21 nm slight odor/no sheen interval 08131/99 50000 14000 11000 2300 6200 20000 45.0 <5.0 7.2 770 <2500 <50 <5.0 <5.0 47.31 nm no comment 44'-54' 12109/99 26000 3300 1900 880 2600 8800 45.0 <5.0 <5.0 120 <500 <50 <5.0 <5.0 45.20 nm no comment 03/01100 13000 3500 280 600 330 6900 <20 <20 <20 e200 Q500 <200 na ne 42.46 nm no comment 06106/00 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 420 <20 41.76 nm clear 09/14/00 85000 16000 12000 2200 6300 16000 420 420 420 380 <2500 <200 <20 <20 4790 nm clear 12/12/00 21000 4000 2900 690 1800 6300 na na na na na ne na na 44.23 nm clear 03119/01 9400 2600 600 430 290 6100 na ne na na na na na na 41.72 nm clear 06119/01 67000 13000 8500 1600 6500 17000 na na ne na na na na na 44.03 nm Gear 09/27/01 16000 3300 840 640 1400 5500 na na na na na ne na na 50.04 nm clear 12113/01 84000 12000 8600 2100 10000 19000 na na na na na ne na na 46.55 nm dear 03/28/72 38000 5800 4400 1100 4800 0900 na na na na na na na ne 43.42 19.53 -23.89 dear 06/19102 37000 6800 2900 1400 3800 13000 na na na na na na na na 45.10 -25.57 clear 09/16/02 56000 7000 2200 1500 5100 14000 <50 <50 <50 <500 <5000 <500 <50 <50 50.33 -30.80 clear 12126102 110000 11000 10000 2400 12000 20000 na na na na na na na na 47.85 -28.32 dear 03/26103 33000 3100 1600 1300 4400 7000 na na na na ne na na na 45.15 -25.62 dear 06/27/73 B400 1300 240 300 550 6100 <10 <10 <10 -100 <1000 <100 <10 na 47.11 -27.58 clear 09119/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.78 -30.25 dear 03126/04 140000 13000 14000 3600 18000 25000 <50 <50 <50 <500 <5000 <500 <50 ne 47.31 -27.78 clear 06!17/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.28 -31.75 not sampled 09/09/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 641gmr.xls Project No,1641,47 Page 7 of 9 IKORIT,ON ENVIRONMENTAL INC.