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TABLE 1 Groundwater Monitoring Data Beacon Station No 3641 1210 E Hammer Lane,Stockton,California I Depth io TOC GW Well TPHg benzene toluene ethylbenzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol EDC ED8 GW Elevation Elevation Number Date NO) ll (ug/1) (ug/1) u n (uq/1) u A u ll (U0.111 (ug/1) NO) Ayq11 u WWI) feat 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 03131!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 4584 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 03125M 90 <0 50 071 <0 50 053 71 '050 <0 50 055 <50 <50 <5 0 na na 4195 nm slight odor I no sheen 06!02!99 130 089 <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 I no sheen 08131199 1000 150 53 45 31 1400 <0 50 <0 50 065 54 <100 <5 0 <0 50 <0 50 4781 nm no comment 12109M 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 03/01/00 <200 <2 0 <2 0 <2 0 <2 0 560 <2 0 <2 0 <20 <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 09114!00 940 95 58 53 36 3100 <2 0 <2 0 <20 76 <250 <20 <2 0 <2 0 4790 nm clear 12112/00 <200 <2 0 <2 0 <2 0 <2 0 1900 na na na na na na na na 4399 nm dear VW 1 03f25f99 20000 4000 2000 900 1700 3000 <50 <50 <50 <50 <50 640 na na 41 70 nm nm slight odor 1 no sheen screened 06/02199 23000 5800 2300 1100 1900 8300 <50 <50 <50 240 <100 <10 <5 0 <5 0 4221 nm slight odor 1 no sheen interval 08/31/99 50000 14000 11000 2300 6200 20000 <50 <50 72 770 <2500 <50 <50 <5 0 4731 nmn0 comment 44 54 12!09199 26000 3300 1900 880 2600 8800 <5 0 <50 <50 120 <5D0 <50 <50 <5 0 4520 nm no comment 03/01/00 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 <200 420 <20 41 76 nm dear 09114/00 85000 16000 12000 2200 6300 16000 <20 <20 <20 380 <2500 <200 <20 <20 4790 nm dear 12112/00 21000 4000 2900 690 1800 6300 na na na na na na na na 4423 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 06102/99 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 AS ns ns ns ns nm nm dry 21 36 12109/99 ns ns ns ns ns ns ns ns ns ns ns its ns ns nm nm dry 03101/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 6!0 06100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09114100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12112100 ns ns ns ns ns ns AS ns ns ns ns ns ns ns nm nm dry VW 3 03125/99 33000 1600 8100 1800 5400 660 <5 0 <5 0 <50 140 <50 <50 na na 4207 nm nm slight odor 1 no sheen screened 06/02/99 13000 6000 180 1400 300 4000 <0 50 <0 50 26 85 <200 <50 <0 50 <0 50 4245 nm slight odor 1 no sheen interval 08/31/99 11000 860 230 470 140 6900 410 <10 <10 300 <1600 <100 <10 <10 4766 nm no comment 45 55 12/09/99 11000 1200 550 560 430 6200 <5 0 <5 0 -50 100 <500 <50 <50 <50 4560 nm no comment 03/01100 12000 5D0 440 680 980 5000 <20 <20 <20 <200 <2000 <200 na na 4294 nm no comment 06/06100 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 12112100 3700 220 180 140 280 $500 na na na na na na na na 4463 nm clear VWA 03/25/99 ns ns ns AS ns ns ns ns ns ns ns ns ns ns nm nm nm dry screened 06/02199 ns ns ns ns ns ns ns AS ns ns ns ns ns ns nm run dry interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 25 40 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 06106!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 09/14100 As ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 12112100 its ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 641gmr00 xis 164143 Page 3 of 4 HORIZON ENVIRONMENTAL INC