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TABLE I GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth t0 10C GW Em-wr, ell TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation ber Date (ug/1) (ug/1) (ug/1) (ug/l) (ug/1) (ugll) (ugn) (ug 1) (ug") (ug/1) (ugll) (ug/1) (ug/1) (ug/1) (feet) (feel msl) (feet mst) Comments VW4 03/25/99 ns ns ns ns ns ns ns as ns ns ns ns ns ns nm nm nm dry screened 06102199 ns ns ns as ns ns ns ns as 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 2540 12/09/99 as 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 as nm nm dry 06/06/00 as ns ns ns ns ns ns ns ns as ns ns ns ns nm nm dry 09/14/00 ns as ns ns ns ns ns ns ns ns ns as as ns nm nm dry 12/12/00 ns as as ns ns ns as ns ns ns ns as ns as nm nm dry 03119/01 ns ns as ns as ns as ns as ns ns ns ns ns nm nm dry 06/19/01 ns ns as ns ns ns ns ns ns ns as ns ns ns dry nm dry 09/27/01 ns ns ns ns ns ns ns ns rig ns ns as ns ns dry nm dry 12/13/01 ns ns ns as as ns ns ns ns ns ns ns ns ns dry nm dry 03/28/02 ns as ns as as ns ns as ns ns ns ns as ns dry nm dry 06/19/02 ns ns ns ns as as ns ns ns ns ns ns ns ns dry nm dry 09/16/02 ns ns ns ns ns ns ns as ns as ns ns ns ns dry nm dry 12/26/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/26/03 ns ns ns ns ns as as as ns ns ns ns as ns dry nm dry VW 5 03/25199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm screened 06102199 ns ns ns ns ns ns ns ns ns ns ns ns ns as nm nm interval 08/31199 ns ns ns as ns ns ns ns ns ns ns ns ns ns 4773 nm 0 05 ft FP!sheen 40 50 12109/99 100000 13000 10000 570 16000 31000 <20 <20 <20 <200 <2000 <200 <20 <20 4570 nm no comment 03/01/00 27000 1 5100 520 1500 770 14000 <50 <50 <50 <500 <5000 <500 na na 4247 nm no comment 06/06/00 43000 7700 4600 1300 3700 16000 <10 <10 <10 750 <2500 <100 -10 <10 4184 nm Gear 09114/00 as ns ns ns ns ns ns ns ns as ns as ns as 4803 nm considered dry 12!12100 16000 1000 1100 480 1800 24000 na na na na na na na na 4401 nm clear 03/19/01 29000 3300 4400 740 3000 20000 na na na na na na na na 41 38 nm clear 06/19/01 120000 16000 13000 2300 11000 41000 na na na na na na na na 4471 nm clear 09/27101 ns ns as as as as as ns ns ns ns ns ns ns dry nm dry 12/13/01 23000 2000 510 180 790 26000 ns ns ns ns ns ns ns ns 4651 nm sheen 03/28/02 10000 760 580 89 330 14000 ns ns as ns ns ns ns ns 4309 1939 2370 no comment 06/19/02 21000 3900 2300 190 750 20000 na na na na na na na na 4542 2603 no comment 09/16/02 ns ns ns ns ns ns ns ns ns as ns as ns as 4886 2947 no comment 12/26102 58000 5500 4200 1000 4500 35000 na na na na na na na na 4741 2802 clear 03/26/03 68000 7500 8200 1300 6400 34000 na na na na na na na na 4511 2572 dear I �I 641gmr AS Project No 164146 Page 7 of 9 HORIZON ENVIRONMENTAL INC