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TABLE I GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane,Stockton,California Depth to TOC GW Well TPHg benzene toluene ethyibenzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1) (u n) NO) u ) (ugn) (ug1) (u911) (ug/1) (ugA) (ugn) u n) (ug/1) NO) (ug/1) (feet) (feet msl) (feet msl) Comments VW-4 03/25/99 ns ns as as as as ns as ns as as ns as ns nm nm nm dry screened 06/02199 as ns as no as ns ns as ns ns as ns ns ns nm nm dry interval 08/31199 ns ns ns ns ns as ns ns ns ns ns as ns as nm nm dry 2540' 12109/99 ns ns ns ns ns as ns ns ns ns ns ns ns ns nm nm dry 03/01100 ns as ns ns ns ns as ns as ns ns ns ns ns nm nm dry 06/06100 ns as ns ns as ns ns ns as as ns ns ns ns nm nm dry 09114/00 as as as as ns ns as ns ns as ns as as ns am nm dry 12/12/00 as ns as ns as ns as as ns ns as ns as ns nm nm dry 03/19/01 ns ns as ns ns as ns ns ns ns ns as as ns nm nm dry 06!19101 ns as ns ns ns as ns ns ns ns ns ns ns as nm nm dry 09/27/01 ns as ns ns ns as ns ns ns ns as as ns as nm nm dry 12113101 ns ns ns as as ns ns ns ns ns ns ns ns as am nm dry 03/28102 ns ns as ns as ns ns ns as ns ns ns ns as nm nm dry 06119!02 ns ns as as as ns as as as as ns ns ns as am nm dry 09116/02 as as ns ns ns ns ns as ns as ns ns ns ns nm nm dry 12/26102 as as ns ns ns ns ns ns ns as as ns as ns nm am dry 03/26/03 ns ns ns ns ns ns ns ns ns ns ns ns as ns nm nm dry 06127/03 as ns ns as ns ns ns ns ns ns as as ns ns nm nm dry 09!19103 as as ns as ns ns ns ns ns ns ns ns ns ns nm nm dry 12/30/03 as ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03126/04 as as ns ns as ns ns ns ns as ns ns ns ns nm nm dry VW5 03125/99 as ns ns as as as ns as ns as as as as ns nm nm nm screened 06102/99 as ns as ns ns as ns ns ns ns ns as ns ns nm nm interval 08131!99 ns ns ns ns ns as ns ns ns ns ns ns ns ns 4773 nm 0 05 It FP1 sheen 40'50' 12109!99 100OW 13000 10000 570 16000 31000 <20 <20 <20 <200 <2000 <200 <20 <20 4570 nm no comment 03/01/00 27000 5100 520 1500 770 14000 <50 <50 <50 <500 <5000 <500 na no 4247 nm no comment 06106/00 43000 7700 4600 1300 3700 16000 <10 <10 <10 750 <2500 <1DO <10 <10 4184 nm clear 09114100 as ns as ns ns as ns as ns ns ns ns ns as 4803 nm considered dry 12/12/00 16000 1000 1100 480 1800 24000 no no no no no no no no 4401 nm clear 03/19101 29000 3300 4400 740 3000 20000 no no no no no no na no 41 38 nm Gear 06119101 120000 16000 13000 2300 11000 41000 no no no no no na no no 4471 nm dear 09127101 ns as ns ns as ns as as ns as as as as as nm nm dry 12/13/01 23000 2000 510 180 790 26DDO ns as ns AS as as ns as 4651 nm sheen 03!28102 10000 760 580 89 330 14000 ns as ns ns as ns ns ns 4309 1939 2370 no comment 06119102 21000 3900 2300 190 750 20000 na no na no no na no no 4542 -2603 no comment 09/16102 ns ns as ns as ns as ns as ns ns ns ns ns 4886 -2947 no comment 12/26102 58000 5500 4200 1000 4500 35000 no no no no no no no na 4741 2802 clear 03/26/03 68000 7500 8200 1300 64DO 34000 no no no na no no no no 4511 2572 clear 06/27/03 ns as ns ns ns as ns ns ns ns as ns ns as 4745 2806 considered dry 09119/03 as ns ns as ns as ns as ns ns as ns ns ns nm nm dry 12/30/03 ns ns ns as as ns ns ns ns ns ns ns as as am nm dry 03126/04 48000 4900 3200 730 4700 25000 <50 <50 <50 10DOJ -45000 <500 <60 no 4734 2795 odor 641grtr)ds Page 9 of 11 HORIZON ENVIRONMENTAL INC Project No 164147