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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No 3641 1110 E Hammer 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 ;uglq {u n} (ug11) (ugA) (u !1) (ugll} (ug11} (ug/1) (ugA) u ) (ugA} (uglq (ugA) (ug/1) (feet) (teei ms!) (feet msq Comments sW 1 10102197 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5657 nm nm not sampled screened 03131198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5123 nm not sampled interval 06/10198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4584 nm not sampled 60'65 09108198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4926 nm not sampled 12/30198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4399 nm not sampled 03125/99 90 <0 50 071 <0 50 053 71 <0 50 <0 50 055 <5 0 <50 <50 ns ns 4195 nm slight odor/no sheen 06!02199 130 089 <0 50 <0 50 <0 50 130 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 4224 nm slight odor 1 no sheen 08/31/99 1000 150 53 45 31 1400 <0 50 <0 50 065 54 <100 <5 0 <0 50 <0 50 4701 nm n0 comment 12/09/99 53 <0 50 <0 50 <0 50 <0 50 500 <0 50 <0 50 <0 50 54 <50 <5 0 <0 50 <0 50 4460 nm no comment 03/01/00 <200 <2 0 <2 0 <2 0 <2 0 560 <2 0 <2 0 <2 0 <20 <300 <20 no no 4238 nm no comment 06/06100 6o 22 <0 50 <0 50 <0 50 510 <0 50 <0 50 <0 50 28 <200 <5 0 <0 50 <0 50 4179 nm Gear 09/14/00 940 95 58 53 36 3100 <2 0 <2 0 <2 0 76 <250 <20 <2 0 <2 0 4790 nm clear 12112/00 <200 <2 0 <2 0 <2 0 <2 0 1900 na no no no na no na no 4399 nm clear 03!19/01 <100 <10 <10 <10 <10 470 na na no no no no na no 4196 nm clear 06/19mi <100 12 10 24 60 540 no no no na na no na no 4515 nm clear 09127101 520 <2 0 24 13 95 2000 no no no no no no no no 4995 nm clear 12113101 <250 <2 5 <2 5 <2 5 73 1800 no no no no na no no no 4616 nm clear 03128!02 <500 <5 0 <50 <5 0 <50 1900 na no no no no na na no 4298 1924 -2374 Gear 611912002 630 160 17 52 25 1700 no no na no no no no no 4570 -2646 clear 911612002 770 82 64 77 15 2100 <5 0 <5 0 <5 0 59 <5D0 <50 <5 0 <5 0 5072 3148 cloudy 12126/2002 <1000 <10 <10 <10 12 2600 no no na no no na na na 4703 2779 cloudy 3/26/2003 520 51 71 71 36 2000 no na no no no na na no 4483 2559 Gear 06127103 1800 550 13 89 13 4200 <10 <10 <10 <100 <1000 <100 <10 na 4780 -2856 clear 09119103 570 60 <5 0 92 <5 0 2900 no no no no no no no no 5416 3492 Gear 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4925 3001 Gear 03126!04 <500 <30 <3 0 <30 <3 0 1500 <3 0 <3 0 <3 0 <50 <5w <50 <30 no 4720 2796 clear VW 1 03/25/99 20000 4000 2000 900 1700 3000 <5 0 <5 0 <5 0 <50 <50 640 no no 41 70 nm nm slight odor/no sheen screened 06102/99 23000 5800 2300 1100 1900 8300 <5 0 <5 0 <5 0 240 <100 <10 <5 0 <50 4221 nm slight odor 1 no sheen interval 08/31/99 50000 14000 11 ODD 2300 6200 20000 <50 <50 72 770 <2500 <50 <5 0 <5 0 4731 nm no comment 44-54 12/09199 26000 3300 1900 880 2600 8800 <5 0 <50 <5 0 120 <500 <50 <5 0 <5 0 4520 nm no comment 03/01100 13000 3500 280 600 330 6900 <20 <20 <20 <200 <2500 <200 na na 4246 nm no comment 06106!00 19000 4600 630 960 1000 7300 <20 <20 <20 400 <20D0 <200 <20 <20 41 76 nm clear 09/1410D 85000 16000 12000 2200 6300 16000 <20 <20 <20 380 <2500 <2D0 <20 <20 4790 nm Gear 12112100 21000 4000 2900 690 1800 6360 na na na na no na na na 4423 nm clear 03/19101 94DO 2600 600 430 290 6100 na na na na no na na na 4172 nm Gear 06!19101 67000 13000 8500 1600 6500 17000 na na no na na na na na 4403 nm clear 09!27/01 16000 3300 840 640 1400 5500 na na na na no no no no 5004 nm Gear 12/131D1 84000 12000 8600 2100 10000 19000 na na no na na no no no 4655 nm Gear 03/281D2 38000 5800 4400 1100 4800 8900 no no na no na no na na 4342 1953 2389 clear 06/19/02 37000 68DO 2900 1400 3800 13000 no no no na na no na no 4510 -2557 clear 09/16/02 56000 7000 2200 1500 5100 14000 <50 <50 <50 <5D0 <5000 <500 <50 <50 5033 3080 clear 12/26/02 110000 11000 10000 2400 12DDD 20000 na no no no na na na na 4785 2832 clear 03/26103 33000 3100 1600 1300 440D 7000 no no na no na na na na 4515 -2562 dear 06/27/03 8400 1300 240 300 550 6100 <10 <10 <10 <1D0 <1000 <100 <10 na 4711 -2758 clear 09/19/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12130!03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4978 -3025 clear 03/26104 140000 13000 14000 3600 18000 25000 <50 <50 <50 <500 <50W <500 <50 na 4731 2778 Gear 641gm xis Pooled No 164147 Page 7 of 11 HORIZON EIMRONMENTAL INC