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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC G W Well TTPgHg benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Daleu11 (UQA) u rl u !I (uq/1) u tl (ug/1) u H (UQ10 u p u tl u 11 (u11) NO) feet feet msl feet msl Comments SW-1 10/02197 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5657 nm nm not sampled screened 03131/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.23 nm not sampled interval 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 45.84 nm not samp}ed 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 ns ns ns ns n$ ns ns ns ns ns ns ns ns ns 43.99 nm not sampled 03125/99 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 odorno 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 slight odor lnosheen 08131199 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!09199 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 03101100 <200 <2 0 <2.0 <2.0 <2.0 560 <2.0 <2.0 <2.0 <20 <300 <20 no na 42.38 nm no comment 06106100 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 09114100 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 12112100 <200 <2 0 <2.0 <2.0 <2.0 1900 no no na no no no na no 43.99 nm clear 03119101 <100 <1.0 <1.0 c1.0 <1.0 470 na no no na na no na no 4196 nm clear 06119101 <100 12 10 2.4 6.0 540 na na no na no no na no 4515 nm clear 09/27101 520 <2.0 2.4 13 9.5 2000 na na no na no na no no 49.95 nm clear 12113/01 <250 <2.5 <2.5 <2.5 73 1800 na na no no no na na no 4616 nm clear 03/28102 <500 <5.0 <5.0 <5.0 <5.0 1900 na na no na na no na na 4298 19.24 -23.74 clear 6/1912002 630 160 17 52 25 1700 na no na na no na no na 45.70 -26.46 clear 9/1612002 770 82 6.4 77 15 2100 <5.0 <5.0 <5.0 59 <500 <50 <5.0 <5.0 50.72 .31,48 cloudy 1212612002 <1000 <10 <10 <10 12 2600 no na no na na no na na 47,03 -27.79 cloudy 3/2612003 520 51 71 7.1 36 2000 na no no na net no na na 44.83 -25.59 clear 06127103 1800 550 13 89 13 4200 <10 <10 <10 <100 <1000 <100 <10 no 47.80 -28.56 clear 09119/03 570 60 <5 0 9.2 <5 0 2900 na no na no na no no no 5416 -34.92 clear 12f30103 ns ns ns ns ns ns ns ns ns ns ns ns Ps ns 49.25 -30.01 clear 03126104 <500 <3.0 <3.0 <3.0 <3 0 1500 <3.0 <3.0 <3.0 <50 <500 <50 <3.0 na 47.20 -27.96 clear 06117104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.90 -32.66 not sampled 09/09104 13000 150 <10 <10 53 2900 <10 <10 <10 100J <1000 <100 <10 na 57.06 -37.82 clear 12116104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 53.41 -34.17 not sampled 03/03105 15000 <2.5 2.7 <2.5 <2.5 15DO <2.5 <2.5 <2 5 <25 <250 <25 <2.5 no 49.80 -30.56 clear YW-1 03125199 20000 4000 2000 900 1700 3000 <5.0 <5.0 <5.Q <5-0 <50 640 na no 41.70 nm nm slight odor 1 no sheen screened 06/02199 23000 5800 2300 1100 1900 8300 <5.0 <5.0 <5.0 240 <10D <10 <5.0 <5.0 42.21 nm slight odor 1 no sheen interval 08131199 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!09199 26000 3300 1900 880 2600 8800 <5.0 <5.0 <5,0 12D <500 <50 <5 0 <5.0 45.20 11m no comment 03101100 13000 3500 280 600 330 6900 <20 <20 <20 <200 <2500 <200 na na 42.46 nm no comment 06106100 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 <20 <20 41.76 nm clear 09114100 85000 16000 12000 2200 6300 16000 <20 <20 <20 380 <2600 <200 <20 <20 47.90 nm clear 12112100 21000 4000 2900 690 1800 6300 no na na na na na na na 44.23 nm clear 03119101 9400 2600 600 430 290 6100 no no na no na no no no 41.72 nm clear 06/19101 67000 13000 8500 1600 6500 17000 no no no na 1181 na na na 4403 nm bear 09127101 16000 3300 840 640 1400 5500 no no na ns ne na na no 50.04 nm clear 12113/01 84000 12000 8600 2100 10000 19000 no no na ne no na no no 46.55 nm clear 03128/02 38000 5800 4400 1100 41300 8900 no no na na na no na na 43.42 19.53 -23.89 clear 06/19102 37000 6800 2900 1400 3800 13000 na 1181 na no na no no no 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 12/26/02 110000 11000 10000 2400 12000 20000 no no no no no na no no 47.85 -28.32 clear 03/26/03 33000 3100 1600 1300 4400 7000 no na no no no na na na 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 09119/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12130103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 49.78 -30.25 clear 03/26104 140000 13000 14000 3600 18000 25000 <50 <50 <50 <500 <5000 <500 <50 no 47.31 .2778 clear 06/17104 ns AS ns ns ns ns ns ns ns ns ns ns ns ns 51.28 -31.75 not sampled 09109/04 n$ ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12116104 ns ns ns ns ns ns ns ns ns ns ns ns ns. ns dry dry dry 03103/05 51000 1700 290 840 5800 6800 <20 <20 <20 2500 <2000 <200 <20 na 47.15 -27.62 odor 1 no shhen Project No.inv._" Page: 10 H03UZON ENVIRONBEL,AL INC.