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a TABLE l Groundwater Monitoring Data Beacon Station No 641 1210E Hammer Lane,Stockton,Callfornin Depth to TOC GW Well TPHg benzene toluene ethylbenzenexylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation !lumber Date (Ug/1) u li u !I (ug/1) ug/1 (Ug/1) (Ug/1) (ug/1) (Ug/1) (ug/1) (ug/1) u !! (Ug/1u !I feel 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 nm nm ns screened 03/31198 ns ns ns ns ns ns ns ns ns ns ns ns na na 51 23 nm ns interval 06/10198 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 AS ns ns ns ns ns ns ns na na 4926 nm ns 12130/98 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 <5 0 na na 4195 nm slight odor I no sheen 06/02199 130 089 <0 50 <0 50 <0 50 130 <0 50 <0 50 <0 50 <50 <50 <5 0 <0 50 <0 50 4224 nm slight odor 1 no sheen 08131/99 1000 150 53 45 31 1400 <0 50 <0 50 065 54 <100 <5 0 <0 50 <0 50 47 B1 nm no comment 12MI99 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 03101!00 <200 <2 0 <20 <2 0 <2 0 560 <2 0 <2 0 <2 0 <20 <300 <20 na na 4230 nm no comment 06106/00 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 dear 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 VW 1 03/25/99 20000 4000 2000 900 1700 3000 <5 0 <5 0 <5 0 <5 0 <50 640 na na 41 70 am nm slight odor 1 no sheen screened 06102M 23000 5800 2300 1100 1900 8300 <5 0 <5 0 <5 0 240 <100 <10 <5 0 <5 0 4221 nm slight odor I no sheen interval 08!31!99 50000 14000 11000 2300 6200 20000 <50 <5 0 72 770 <2500 <50 <5 0 <5 0 4731 nm no comment 44-54 12109!99 26000 3300 1900 880 2600 8800 <5 0 <5 0 <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 06106100 19000 4600 630 960 1000 7300 <20 <20 <20 400 <2000 <200 <20 <20 4176 nm clear 09114/00 85000 16000 12000 2200 6300 16000 <20 <20 <20 380 <2500 <200 <20 <20 4790 nm clear VW 2 03125!99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06102199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry interval 08/31/99 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 03/01100 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 AS ns nm nm dry 09114/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry VW 3 03125/99 33000 1600 8100 1800 5400 660 <50 <50 <5 0 140 <50 <50 na na 4207 nm nm slight odor I no sheen screened 06/02/99 13000 6000 180 1400 300 4000 <0 50 <0 50 26 85 <200 <5 0 <0 50 <0 50 4245 nm slight odor I no sheen Interval 08/31/99 11000 860 230 470 140 6900 <10 <10 <10 300 <1500 <100 <10 <10 4766 nm no comment 45 55 12/09/99 11000 1200 550 560 430 6200 <5 0 <50 <5 0 100 <500 <50 <5 0 <5 0 4560 nm no comment 03/01/00 12000 50O 440 680 980 5000 <20 <20 <20 <200 <2000 <200 na na 4294 nm no comment 06/06/00 5900 1400 170 340 260 5600 <2 0 <2 0 39 260 <2000 <20 <2 0 <2 0 4200 nm clear 09114100 2600 760 52 85 120 2400 <2 0 <2 0 <2 0 110 <250 <20 <2 0 <2 0 4828 nm clear VW4 03/25/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06/02199 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 AS ns nm nm dry 25.40' 12109/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03101/00 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 n$ ns ns ns ns ns nm nm dry 641gmr00 xls 164143 Page 3 of 4 HORIZON ENVIRONMENTAL INC