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:\ TABLE 1 GROUNDWATER MONITORING DATA Beacon Station N0.3641 1210 E.Harnmer Lane,Stockton,California Depth to TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1l) (ugly (ugll) (ugll) (ug/1) (ug/1) (ugll) (ugll) (ug/1) (ugll (ug") (ugly (ug/1) (ugll) (feet) (feet msl) (feet msl) Comments SW-1 10102/97 ns ns ns n$ ns ns ns ns ns ns ns ns ns ns 56.57 nm nm not sampled screened 03/31/98 ns as ns ns ns ns ns ns ns ns ns ns ns ns 51.23 nm not sampled interval 06/10/98 ns as ns as ns ns ns ns ns ns ns ns ns ns 45,84 nm not sampled 60'-65' 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.26 nm not sampled 12130/98 n$ ns ns ns ns ns ns ns ns ns ns ns ns ns 43.99 nm not sampled 03/25/99 90 <0.50 0.71 <0.50 0.53 71 <0.50 <0.50 0.55 <5.0 <50 <5.0 ns as 41.95 nm slight odor/no sheen 06/02/99 130 0.89 <0.50 <0.50 <0.50 130 <0.50 <050 <0.50 <5.0 450 <5.0 <0.50 <0.50 42.24 nm slight odor 1 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 nm no comment 12/09/99 53 <0.50 <0.50 <0.50 <0.50 500 <0.50 <0,50 <0.50 5.4 <50 <5.0 <0.50 <0.50 44.60 nm no comment 03/01/00 <200 <2.0 <2.0 <2,0 <2.0 560 <2.0 <2.0 <2.0 <20 <300 420 no no 42.38 nm no comment 06/06100 60 2.2 <0.50 <0.50 <0.50 510 <0.50 <0.50 <0,50 28 <200 <5.0 <0.50 <0.50 41.79 nm clear 09!14100 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 12/12100 <200 <2.0 c2.0 <2.0 <2.0 1900 no no no no na na no no 43.99 nm clear 03/19101 <100 <1,0 <1.0 <1.0 <1.0 470 ne no no no no no no na 41.96 nm clear 06/19101 <100 12 10 2.4 6.0 540 no no no no no no no no 45.15 nm clear 09/27101 520 <2.0 2.4 13 9.5 2000 no no na no no no no no 49.95 nm clear 12113/01 <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 na na 42.98 19.24 -23.74 clear 6/19/2002 630 160 17 52 25 1700 no no no na na na no no 45.70 -26.46 clear 9116/2002 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 12/2612002 <1000 <10 <10 <10 12 2600 no no no no no no no no 47.03 -27.79 cloudy 3/26/2003 520 51 71 7.1 36 2000 no no no no na no na na 44.83 -25.59 clear 06/27103 1800 550 13 89 13 4200 <10 <10 <10 <100 <1000 <100 <10 no 47.80 -28.56 clear 09/19103 570 60 <5.0 9.2 <5.0 2900 na no no no no no no no 54.16 -34,92 clear 12/30103 ns ns ns ns ns ns As ns ns as ns ns as no 49.25 -30,01 clear 03/26104 <500 <3.0 <3.0 <3.0 <3.0 1500 <3.0 .9.0 <3.0 <50 <500 <60 <3.0 no 47.20 -27.96 clear 06/17104 ns as ns as ns ns as as ns ns ns ns ns ns 51.90 -32.66 not sampled VW-1 03/25/99 20000 4000 2000 900 1700 3000 <5.0 <5.0 <5.0 <5.0 <50 640 no na 1 41,70 nm nm slight odor lnosheen screened 06/02199 23000 5800 2300 1100 1900 8300 <5.0 <5.0 <5.0 240 <100 <10 <5.0 <5.0 42.21 nm slight odor 1 no 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 880 2600 8800 <5.0 <5.0 C5.0 120 <500 <50 <5.0 <5.0 45.20 nm no comment 03/01100 13000 3500 280 600 330 6900 <20 <20 <20 <200 <2500 400 no no 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 09114/00 85000 16000 12000 2200 6300 16000 <20 <20 <20 360 <2500 <200 <20 <20 47.90 nm clear 12/12100 21000 4000 2900 690 1800 6300 na no no no no na na no 44.23 nm clear 03119/01 9400 2600 600 430 290 6100 no no no na no no no no 41.72 nm Gear 06/19/01 67000 13000 8500 1600 6500 17000 no na no no no no na no 44.03 nm dear 09/27/01 16000 3300 840 640 1400 5500 na na no no no no na na 50.04 nm clear 12/13/01 84000 12000 8600 2100 10000 19000 na no no no na no no no 46.55 nm clear 03128/02 38000 5800 4400 1100 4800 8900 no no no no no no no no 43.42 19.53 -23.89 clear 06119/02 37000 6800 2900 1400 3800 13000 no no no no no na na no 45.10 -25.57 clear 09116/02 56000 7000 2200 1500 5100 14000 <50 <50 <50 <500 <5000 <500 <50 <50 50.33 -30.80 clear 12126/02 110000 11000 10000 2400 12000 20000 na na no no no no no no 47.85 -28.32 clear 03/26/03 33000 3100 1600 1300 4400 7000 no no no na na no no no 45.15 -25.62 clear 06/27/03 8400 1300 240 300 550 6100 <10 <10 <10 <100 <1000 <100 <10 no 47.11 -27.58 clear 09119103 ns as ns ns as ns ns ns ns as ns ns ns ns nm nm dry 12/30103 as as ns ns ns as ns ns ns ns ns ns ns as 49.78 -30.25 clear 03/26104 140000 13000 14000 3600 18000 25000 <50 <0 <50 <500 <6000 <500 <50 no 47.31 -27.78 clear 06/17104 as ns ns ns ns as ns ns ns as ns ns ns ns 51.28 -31.75 not sampled 641gmr.rla P-ject W,1641,47 Page 7 of 11 HORIZON ENVIRONMENTAL INC.