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TABLE I GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E hammer Lane,Stockton,California Depth to TOC GW Well TPH9 benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (uglq (ug") (ug/1) (ugll) (ug/1) {ugll) (ug") (ug1l) (ugA) (ug/1) (ug11) (ug1E) {ug1l) (ug1l) (feet) (feet msl) (feet msl) Comments SW-1 10/02197 ns ns ns ns ns ns ns ns ns ns ns ns na na 5657 nm nm ns screened 03/31/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 51 23 nm ns rnterval 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 4584 nm ns 60'-65 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 4926 nm ns 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 4399 nm ns 03/25/99 90 <0 50 071 <0 50 053 71 <0 50 <0 50 055 <5 0 <50 <50 na na 41 95 nm slight odor!no sheen 06102199 130 089 <0 50 <0 50 <0 50 130 <0 50 <0 50 <0 50 <5 0 <50 <50 <0 50 <0 50 4224 nm slight odor!no sheen 08/31/99 1000 150 53 45 31 1400 <0 50 <0 50 065 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 54 <50 <50 <0 50 <0 50 4460 nm no comment 03101/00 400 <2 0 <2 0 <2 0 <2 0 560 <2 0 <2 0 <2 0 <20 <300 <20 na na 4238 nm no comment 06/06/00 60 22 <0 50 <0 50 <0 50 510 <0 50 <0 50 <0 50 28 <200 <50 <0 50 <0 50 41 79 nm clear 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 12/12/00 <200 <2 0 <2 0 <2 0 <2 0 1900 na na na na na na na na 4399 nm clear 03/19/01 <100 <10 <10 <10 <10 470 na na na na na na na na 4196 nm clear 06/19/01 <100 12 10 24 60 540 na na na na na na na na 4515 nm clear 09/27/01 $20 <2 0 24 13 95 2000 na na na na na na na na 4995 nm clear 12/13/01 <250 <2 5 <2 5 <2 5 73 1800 na na na na na na na na 4616 nm clear 03/28/02 <500 <5 0 <5 0 <5 0 <50 1900 na na na na na na na na 4298 1924 2374 clear 6!1912002 630 160 17 52 25 1700 na na na na na na na na 4570 2646 clear 9/16/2002 770 82 64 77 15 2100 <5 0 <5 0 <5 0 59 <500 <60 <5 0 <5 0 5072 31 48 cloudy 1 212612 00 2 <1000 <10 <10 <10 12 2600 na na na na na na na na 4703 2779 cloudy 3/26/2003 520 51 71 7 1 36 2000 na na na na na na na na 4483 2559 clear VW-1 03125/99 20000 4000 2000 900 1700 3000 <5 0 <50 <50 <50 <50 640 iia na 41 70 nm nm slight odor!no sheen screened 06/02/99 23000 5800 2300 1100 1900 8300 <5 0 <5 0 <5 0 240 <100 <10 <5 0 <5 0 4221 nm slight odor 1 no sheen interval 08131/99 50000 14000 11000 2300 6200 20000 <5 0 <5 0 72 770 <2500 <50 <50 <5 0 47 31 nm no comment 44 54 12109/99 26000 3300 1900 880 2600 8800 <5 0 <5 0 <50 120 <500 <50 <5 0 <5 0 4520 nm no comment 03101/00 13000 3500 280 600 330 6900 <20 <20 <20 <200 <2500 <200 na na 4246 nm no comment 06/06100 19000 4600 630 960 1000 7300 <20 40 <20 400 <2000 <200 <20 <20 4176 nm clear 09/14100 85000 16000 12000 2200 6300 16000 <20 <20 <20 380 <2500 <200 <20 <20 4790 nm Gear 12/12/00 21000 4000 2900 690 1800 6300 na na na na na na na na 4423 nm clear 03/19/01 9400 2600 600 430 290 6100 na na na na na na na na 4172 nm clear 06119101 67000 13000 8500 1600 6500 17000 na na na na na na na na 4403 nm clear 09127101 16000 3300 840 640 1400 5500 na na na na na na na na 5004 nm clear 12/13/01 84000 12000 8600 2100 10000 19000 na na na na na na na na 4655 nm clear 03/28102 38000 5800 4400 1100 4800 8900 na na na na na na na na 4342 1953 2389 clear 06/19102 37000 6800 2900 1400 3800 13000 na na na na na na na na 4510 2557 clear 09/16102 56000 7000 2200 1500 5100 14000 <50 <50 <50 <500 <5000 <500 <50 <50 5033 3080 clear 12/26/02 110000 11000 10000 2400 12000 20000 na na na na na na na na 4785 2832 clear 03/26/03 33000 3100 1600 1300 4400 7000 na na na na na na na na 4515 2562 Gear 1 641gmr xis PrgeG No 164146 Page 5 of 9 HORIZON ENVIRONMENTAL INC