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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TUC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanot ethanal DCA EDB GW Elevation Elevation Number Date u /1 (u H) (u /4 u (u ] u /I (u I) lug/,) u /1) {u I u !) (u ] u /1) (u /l) {feet (feet ms1) eet msly Comments SW-1 10/02797 ns ns ns n$ ns as ns ns ns as as ns ns ns 56.57 nm am not sampled screened 03/31198 ns ns as as ns ns ns ns ns as ns ns ns ns 51.23 am not sampled interval 06110/98 ns as as as ns ns ns ns ns ns ns as as ns 45.64 nm not sampled 60'•65' 09/08/98 ns as as ns ns ns ns ns as ns ns ns as as 49.26 nm not sampled 12/30/98 ns ns as as ns ns as ns as as ns as ns ns 43.99 nm not sampled 03/25199 90 <0.50 0.71 <0.50 0.53 71 <0.50 4.50 0.55 <5.0 <50 <5.0 ns ns 41.95 am slight odor/no sheen 06/02!99 130 0.89 <0.50 <0.50 <0.50 130 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 42.24 nm slightodor/no sheen 08/31/99 1000 150 53 45 31 1400 <0.50 <0.50 0.65 54 <100 <5.0 <0.50 <0.50 47.81 am no comment 12/09/99 53 <0.50 <0.50 <0.50 <0.50 500 <c.50 <0.50 <0.50 5.4 <50 <5.0 <0.50 <0.50 44,60 nm no comment 03/01100 <200 <2.0 <2.0 <2.0 Q.0 560 <2.0 <2.0 <2 0 <20 <300 <20 na no 42.38 nm no comment 06/06/00 60 2.2 <0.50 <0.50 <0.50 510 <0.50 c0.50 <0.50 28 <200 <5.0 <0.50 <0.50 41.79 nm clear 09/14/00 940 95 5.8 53 3.6 3100 <2.0 <2.0 <2.0 76 <250 <20 <2.0 <2.0 47.90 nm clear 12/12/00 <200 c2.0 <2.0 <2.0 <2.0 1900 no no no no na no no no 43.99 nm clear 03/19/01 -100 <1.0 <1.0 <1.0 <1.0 470 no no no no no no no no 41.96 am clear 06/19/01 <100 12 10 2.4 6.0 540 no no na no no no no no 45.15 nm clear 09/27/01 520 -2.0 2.4 13 9.5 2000 no no no na na no na no 49.95 am clear 12/13/01 <250 <2.5 <2.5 <2.5 7.3 1800 no no no no na no no no 46.16 nm clear 03/28102 -500 <5.0 <5.0 <5.0 <5.0 1900 no no no na no no no no 42.98 19.24 -23.74 clear 6/19/2002 630 160 17 52 25 1700 no na no na na no no no 45.70 •26.46 clear 9/16/2002 770 82 6.4 77 15 2100 <5.0 <5.0 <5.0 59 <500 <50 <5.0 <5.0 50.72 •31.46 cloudy 12/26/2002 <1000 <10 <10 <10 12 2600 no no no no na no no no 47.03 27.79 cloudy 3726/2003 520 51 71 7.1 36 2000 no no no no no no no no 44.83 -25.59 clear 06/27/03 loco 550 13 89 13 4200 <10 <10 <10 <100 x1000 <100 <10 no 47.80 -28.56 clear 09/19/03 570 60 <5.0 9.2 <5.0 2900 no no no no no na no no 54.16 -34.92 clear 12/30/03 as ns ns as ns ns as ns ns ns ns as ns ns 49.25 -30.01 clear 03/26/04 <600 <3 0 <3 0 <3.0 <3.0 1500 <3.0 <3.0 -3.0 <50 -500 <50 <3 0 no 47.20 27.96 clear 06/17/04 ns ns ns as n$ ns ns ns as ns as ns ns ns 51.90 -3266 not sampled 09/09/04 13000 150 <10 <10 53 2900 <10 <10 <10 100 J -1000 <100 <10 no 57.06 -37.82 clear 12/16/04 as ns ns ns as as ns ns ns ns as as ns ns 53.41 -34.17 not sampled VW-1 03/25/99 20000 4000 2000 900 1700 3000 <5.0 <5.0 <5.0 <5.0 <50 640 no no 41.70 nm nm slight odor/no sheen screened 06/02x99 23000 5800 2300 1100 1900 8300 <5.0 <5.0 <5.0 240 <100 <10 <5.0 <5.0 42.21 nm slight Odor Ino sheen interval 08/31/99 50000 14000 11000 2300 6200 20000 <5.0 <5.0 7.2 770 <2500 <50 <5.0 <5.0 47.31 nm no comment 44'-54' 12/09/99 26000 3300 1900 080 2600 8800 <5.0 <5.0 <5.0 120 -500 <50 <5.0 <5 0 45.20 nm no comment 03/01/00 13000 3500 280 600 330 6900 <20 -420 <20 <200 <2500 <200 no na 42.46 nm no comment 06/06/00 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 <20 <20 41.76 nm clear 09/14100 85000 16000 12000 2200 6300 16000 <20 <20 <20 380 <2500 <200 <20 <20 47.90 nm clear 12/12100 21000 4000 2900 690 1800 6300 no no as no no na no no 44.23 nm clear 03/19/01 9400 2600 600 430 290 6100 no no na no no no no no 41,72 nm clear 06/19101 67000 13000 8500 1600 6500 17000 no na no no no no na no 44.03 nm Gear 09/27/01 16000 3300 840 640 1400 5500 no na no no na no na no 50.04 nm clear 12/13/01 84000 12000 8600 2100 10000 19000 no no no no no no no no 46.55 nm clear 03/28/02 38000 5800 4400 1100 4800 8900 no no no no no no no na 43.42 19.53 -23.89 clear 06/19/02 37000 6800 2900 1400 3800 13000 no no no na no na no no 4510 •25.57 clear 09/16102 56000 7000 2200 1500 5100 14000 <50 <50 <50 <500 <5000 <500 <50 <50 50.33 -30.80 clear 12/26/02 110000 11000 10000 2400 12000 20000 no no no no no na no na 47.85 -26.32 clear 03/26/03 33000 3100 1600 1300 4400 7000 no no no no no no no na 45.15 -25.62 clear 06/27/03 8400 1300 240 300 550 6100 <10 <10 <10 <100 c1000 c100 <10 no 47.11 27.58 clear 09/19/03 ns as ns ns ns as ns ns ns as ns ns ns ns dry dry dry 12/30/03 ns ns ns ns ns ns ns ns ns ns ns n6 as ns 49.78 -30.25 clear 03/26/04 140000 13000 14000 3608 16000 25000 <50 <50 <50 <500 <5000 -500 <50 no 47.31 -27.78 clear 06/17/04 ns as ns ns ns ns as ns as ns ns ns as ns 51.28 -31.75 not sampled 09/09/04 ns ns as ns ns ns ns ns as ns ns as ns ns dry dry dry 12/16104 as as as ns ns as ns ns as ns ns as ns ns dry dry dry 641gmr.sls Pmts-I No,1641,47 Page 7 of 9 HORIZON ENVIRONMENTAL INC.