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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1210 E.Hammer Lane,Stockton,California Depth to TOC GW Welt TPHg benzene toluene ethylbenzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanoT(ug/1) DCA EDB GW Elevation Elevation Number Date (ug/1) (ugll) (ug/1) (ugA) (uglq (ug/1) (ugl1) (ugh) (ugA) (ug/1) (ug/1) (ugA) (ugll)I (feet) (feet msl) (feet msl) Comments VW-6 03/25/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm nm not sampled screened 06/02/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled interval 08!31199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 47.73 nm sheen 22'-32' 12109/99 ns ns ns ns ns ns ns ns AS ns no 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 no 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 03/19/01 ns ns ns no ns no ns ns ns ns ns ns ns ns nm nm dry 06/19101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09127101 ns ns ns ns ns ns ns no ns ns ns ns ns ns nm nm dry 12!13101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 03/28/02 ns no ns ns ns ns ns ns n$ ns ns ns ns ns nm nm dry 06/19/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/16/02 ns ns ns ns ns ns ns ns ns ns ns ns ns rts nm nm dry 12/26172 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 31.85 nm dry 03/26103 ns ns no no ns ns ns ns ns ns ns ns ns ns nm nm dry 06/27103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/19/03 ns ns ns ns ns ns ns ns ns ns ns ns no ns nm nm dry 12/30/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 3185 rim clear 03/26104 ns ns ns ns ns ns ns ns ns ns ns ns no ns nm nm dry 06/17104 ns ns ns ns n$ ns ns ns ns ns ns ns ns ns nm nm dry VW-7 03/25199 25000 5700 3300 1500 1700 2000 <5.0 -5.0 <5.0 2DD <50 <5 0 no no 41.67 nm nm slight odor no sheen screened 06/02199 11000 3300 320 1100 230 1700 <5.0 <5.0 <5,0 92 <100 <5 0 <5.0 <5.0 41.94 nm slight odor 1 no sheen interval 08131!99 ns ns ns ns ns no ns ns ns ns ns ns ns ns 47.35 om 0.21 ft FP15heen 40'-55' 12109M 87000 2300 1000 1500 5400 6400 eso <50 <50 <500 <5000 <500 <50 <50 45.26 nm no comment 03/01100 11000 2200 160 640 640 4300 <50 <50 <50 <500 <5000 <500 no no 42.47 nm no comment 06/06/00 15000 2400 440 620 1100 3000 <5.0 <5.0 <5.0 280 -2000 <50 <5.0 <5.0 41.50 nm clear 09/14170 4600D 440 560 1600 3000 1000 <5.0 <5.0 <5.0 76 <600 <50 45.0 <5.0 47.81 nm clear/sheen 12/12/00 17000 940 420 450 1600 5200 no no no no no no no no 4416 nm clear 03/19/01 4100 650 16 180 94 2900 na no no no no no no no 41.38 nm clear 06119101 24000 2800 670 770 1800 7300 no no no no no no no no 43.86 nm clear 09/27101 51000 1400 3900 1800 6800 1400 na no no no na na na no 50.01 nm clear 12/13101 4400 270 70 140 246 2000 no no no no no no no na 46.57 nm clear 03128102 2400D 1100 760 850 2100 2500 no no no no no no no no 43.14 19.29 -23.85 clear 06/19/02 36000 2600 2000 1200 4600 5100 no no no no no no no no 44.89 -25.60 clear 09/16102 57000 2400 5000 1600 5300 2800 <10 <10 <10 150 <2500 <100 <10 <10 50.20 -30.91 clear 12/26/02 3100 200 30 110 78 2000 na no no no no no no na 47.45 -28.16 Gear 03/26/03 3500 170 20 280 83 2600 no no no no no no no no 45.14 -25.85 clear 06127/03 30000 1900 1700 1000 4200 4700 <20 <20 <20 <200 <2000 <200 <20 na 46.87 -27.58 Gear 09/19/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12130/03 140000 7600 13000 3900 21000 5300 no no no no no no no no 49.77 -30.48 clear 03126/04 87000 730 1800 2600 12000 2500 <25 <25 <25 <150 -42500 <250 e25 no 47.21 -27.92 sheen 06117/04 120000 6a00 7100 3000 1500D 11000 <60 <50 <50 520 J -40000 <500 -50 no 51.25 -31.96 clear 641gmr.�Js Pmjed No.1641.47 Page 10 of 11 HORIZON ENVIRONMENTAL INC.