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• • • TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 East Hammer Lane,Stockton,California Depth 10 TOC GW Well TPHg benzene toluene ethylbenzene xylenesFMTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u !I u p u 1I u !I (.911) u 11 (ug/1) (ug/1) u 11 u ! u ll (ug/1) u n u 11 feet feet msl feet msl Comments VW 1 03!25199 20000 4000 2000 900 1700 3000 <5 0 <50 <50 <50 <50 640 i na na 41 70 nm nm slight odor!no sheen screened 06/02/99 23000 5800 2300 1100 1900 8300 <5 0 <5 0 <50 240 <100 <10 <5 0 <5 0 4221 nm slight odor!no sheen interval 08131!99 50000 14000 11000 2300 6200 20000 <50 <5 0 72 770 <2500 <50 <5 0 <50 4731 nm no comment 44-54 12!09199 260DO 3300 1900 880 2600 8800 <60 <50 <50 120 <500 <50 <50 <50 4520 nm no Comment 03101/00 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 <20 <20 4176 nm clear 09!14100 85000 16000 12000 2200 6300 16000 <20 <20 <20 380 <2500 <200 <20 <20 4790 nm clear 12112/00 21000 4000 2900 690 1800 6300 na na na na na na na na 4423 nm clear 03119!01 9400 2600 600 430 290 6100 na na na na na na na na 4172 nm clear 06119101 67000 13000 8500 1600 6500 17000 na na na na na na na na 44 03 nm dear D9127101 16000 3300 840 640 1400 5500 na na na na na na na na 50 D4 nm clear 12/13101 64000 12000 8600 2100 10060 190DO na na na na na na na na 4655 nm clear 03/28102 38000 5800 4400 1100 4800 8900 na na na na na na na na 4342 1953 2389 clear 86/19102 37000 6800 2900 1400 3800 13000 na na na na na na na na 4510 2557 clear 09/16/02 56000 7000 2200 1500 5100 14000 <50 <50 <50 <500 <5000 <500 <50 <50 5033 3080 clear 12/26/02 110000 11000 10000 2400 12000 20000 na na na na na na na na 4785 -2832 clear 03/26/03 33000 3100 1600 1300 4400 7000 na na na na na na na na 4515 -2562 clear VW 2 03125/99 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 08/31/99 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!0110[) ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06!06!00 ns ns n$ 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 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 nrn nm dry 03119101 ns ns ns ns ns ns ns ns ns ns ns Its ns ns nm nm dry 06!19/01 ns ns ns ns AS ns ns ns ns ns ns ns ns ns dry nm dry 09/27101 ns n$ ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12/13101 ns ns ns ns ns ns ns Its ns ns ns ns Its ns dry nm dry 03/28102 ns ns ns ns ns ns ns ns n$ ns ns ns ns ns dry nm dry 06!19102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns' dry nm dry 09116/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12126!02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03126103 ns AS ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry VW 3 03/25199 33000 1600 8100 1800 5400 660 <5 0 <5 0 <5 0 140 <50 <5 0 na na 4207 nm nm slight odor/no sheen screened 06!02199 13000 6000 180 1400 300 4000 <0 50 <0 50 26 85 <200 <5 0 -4050 <0 50 4245 nm slight odor f no sheen interval 08131199 11000 860 230 470 140 6900 <10 <10 <10 300 <1500 <100 <10 <10 4766 nm no comment 45 55 12/09199 11000 1200 550 560 430 6200 <50 <50 <50 100 <500 <50 <50 <50 4560 nm no comment 03/01100 12000 500 440 686 980 5000 <20 <20 <20 <200 <2000 <200 na na 4294 rim no comment 06/06/00 5900 1400 170 340 260 5600 <20 <20 39 260 <2000 <20 <20 <2 0 4200 nm clear 09114/00 2600 760 52 85 120 2400 <2 0 <2 0 <20 110 <250 <20 <2 0 <2 0 4828 nm Clear 12112/00 3700 220 160 140 280 5500 na na na na na na na na 4463 nm clear 03119/01 2600 110 72 150 160 2700 na na na na na na na na 4181 nm clear 06119/01 11000 2900 450 280 860 6700 na na na na na na na na 4450 nm dear 09/27/01 860 78 10 12 26 1700 na na na na na na na na 5045 nm clear 12/13/01 1300 280 21 33 62 2400 na na na na na na na na 4699 nm clear 03/28/02 2900 91 52 150 170 2200 na na na na na na na na 4363 2006 -2357 clear 06119102 10000 2300 280 350 1100 5400 na na na na na na na na 4546 -2540 Gear 09116/02 1400 170 34 52 74 1900 <5 0 <5 0 <50 62 <500 <50 <50 <50 5066 3060 clear 12126/02 1100 75 16 41 60 1600 na na na na na na na na 4795 2789 clear 03126/03 2100 150 15 64 150 1900 na na na na na na na na 4555 -2549 Gear 641gmr Pmjed No 1641 45 Page 5 of 7 HORIZON ENVIRONMENTAL