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• T*E 1 • Groundwater Monitoring Data Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth to TOC GW Welll I TPlig benzene toluene ethylbenzene xylenes MTBE RIPE ETRE TAME TBA methanol ethanal EDC EDB GW Elevation Elevation Number Date (ugA) (ugA) (ugA) (ug/1) (uglq (ugA) (ugA) (ug1l) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (feet) (feet msl) (feet msl) Comments SW-1 10/02/97 ns ns ns ns ns ns ns ns ns ns ns ns na na 5657 nal nm ns screened 03/31/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 5123 nm ns interval 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 4564 nm ns 60-65 09/08198 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 <50 <50 <50 na na 4195 nm slight odor 1 no sheen 06/02/99 130 089 <0 50 <0 50 <0 50 130 <0 50 <0 50 <0 50 <50 <50 <50 <0 50 <0 50 4224 nm slight odor 1 no sheen 08!31199 1000 150 53 45 31 1400 <0 50 <0 50 065 54 <100 <50 <0 50 <0 50 4781 nm no comment 12109/99 53 <0 50 <0 50 <0 50 <0 50 500 <0 50 <0 50 <0 50 54 <50 <50 <0 50 <0 50 44 60 nm no comment 03/01/00 <200 <2 0 <2 0 <2 0 <2 0 560 <2 0 c2 0 <2 0 <20 <300 <20 na na 4238 nm no comment 06/06100 60 22 <0 50 <0 50 <0 50 510 <0 50 <0 50 <0 50 28 <200 <50 <0 50 <0 50 4179 nm dear 09/14100 940 95 58 53 36 3100 <2 0 <2 0 <20 76 <250 <20 <2 0 <2 0 4790 nm dear 12112/00 <200 <2 0 <2 0 <2 0 <2 0 1900 na na na na na na na na 4399 nm dear 03119101 <100 <10 <10 <10 <10 470 na na na na na na na na 4196 nm dear 06/19/01 <100 12 10 24 60 540 na na na na na na na na 4515 nm dear 09/27/01 520 <2 0 24 13 95 2000 na na na na na na na na 4995 nm dear VW-1 03/25199 20000 4000 2000 900 1700 3000 <5 0 <5 0 <50 <50 <50 640 na na 41 70 nm nm slight odor/no sheen screened 06/02199 23000 5800 2300 1100 1900 8300 <50 <5 0 <5 0 240 <100 <10 <50 <5 0 4221 nm slight odor/no sheen Interval 08131/99 50000 14000 11000 2300 6200 20000 <5 0 <5 0 72 770 <2500 <50 <5 0 <50 4731 nm no comment 44-54' 12/09/99 26000 3300 1900 880 2600 8800 <50 <5 0 <5 0 120 <500 <50 <5 0 <50 4620 nm no comment 03/01/00 13000 3500 280 600 330 6900 <20 <20 <20 <200 <2500 <200 na na 4246 nm no comment 06/06/00 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 <20 <20 4176 nm dear 09/14/00 85000 16000 12000 2200 6300 16000 <20 <20 <20 380 <2500 <200 <20 <20 4790 nm Gear 12/12100 21000 4000 2900 690 1800 6300 na na na na na na na na 4423 nm dear 03/19/01 9400 2600 600 430 290 6100 na na na na na na na na 4172 nm dear 06/19/01 67000 13000 8500 1600 6500 17000 na na na na na na na na 4403 nm dear 09127/01 16000 3300 840 640 1400 5500 na na na na na na na na 5004 nm dear VW-2 03/25/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06102/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 08/31199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 21 36 12/09/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/01/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/06/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/14/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12112/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03119/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/19/01 ns ns ns ns ns ns ns ns ns ns ns ns ns n$ dry nm dry 09/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 641gmr00 As 164143 Page 4 of 6 HORIZON ENVIRONMZNTAL INC