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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No 3641 1210 E Hammer Lane, Stockton, California Depth to roc Gw Well TPHg benzene toluene cthylberrzene xylenes MTBE D1PE ETRE TAME TBA methanol ethanol EDC EDB Gw Elevation Elevation Number Date I (ugA) (u 10 (u A (ugll) (ug/1) (u 11) (ug/0 (ug/1) (ug10 (u !q (ug/1) (u 10 Wgll) (ug/1) (feet) (fen cost) (fen msp Comments VW-7 03/25199 25000 5100 3300 1500 1700 2000 <50 <50 <50 200 <50 <50 na na 41 67 run nm slight odor 1 no sheen screened 06102/99 11000 3300 320 1100 230 1700 <50 <50 <50 92 <100 <50 <5 0 <50 4194 nm slight odor!no sheen interval 0831199 os as as as its as as as as ns ns as ns as 47 35 nm 0 21 ft FP/sheen 40 55 12109/99 87000 2300 1000 1500 5400 6400 <50 <50 <50 <500 <5000 <500 <50 <50 45 26 nm no comment 03101/00 11000 2200 160 640 640 4300 <50 <50 <50 <500 <5000 <500 na na 4247 tun no comment 0610600 15000 2400 440 620 1100 3000 <50 <50 <5 0 280 <2000 <50 <50 <5 0 41 50 tun clear 09/14100 46000 440 560 1600 3000 1000 <50 <50 <5 0 76 <600 <50 <5 0 <50 4781 nm clear/sheen 12/12/00 17000 940 420 450 1600 5200 na as na na na na na na 44 16 nm clear 03119101 4100 650 16 180 94 2900 na na na na na na na na 41 38 nm clear 06119/01 241)00 28W 870 770 1800 7300 na na na na na na na na 43 86 nm clear 09!27!01 51000 1400 3900 1800 6800 1460 na na na na na na na na 5001 run clear 12!13101 4400 270 70 140 240 2000 na na na na na m na na 4657 nm clear 03/28/02 24000 1100 760 850 2100 2500 na na na na na na na na 43 14 1929 23 85 clear VW-8 03125199 ns as ns as as ns as as as as as as ns as dry tial nm dry screened 06102!99 ns as as as as ns as ns as as as as ns its dry run dry interval 08131/99 ns ns as ns as as as as ns as us as as as dry nm dry 22 32 12109/99 as ns as ns as Its as as as as as as as as dry nm dry 03101/00 as as as ns us ns as ns as as its as as ns dry nm dry 06106/00 as its as as ns ns as ns as as as as its as dry nm dry 09114/00 ns ns ns as as as as as as as as as ns as dry nm dry 12112/00 ns its ns as ns ns as as as as Its ns as as dry nm dry 03119/01 as as as as ns as as as as as as ns as as dry inn dry 06IL9101 as as as as as as as as as as ns ns as as dry run dry 09/27101 ns as as as its as as as as as as Its as as dry nm dry 12113101 as as as as as as ns as ns ns as ns as as dry nm dry 03/28102 as ns as as ns as ns as as ns as ns as as dry rim dry Nates TP116=kraal petroleum hydrmarbons as 6asohnc p611=martbrams per liter(parts per trillion or pph) MTBE=methyl tort butyl ether GW-groundwater RIPE—dusoprupyl ether TOC=tap m"sm6 EfBE ethyl ten butyl wirer na=not analy2cd TAME=ten amyl methyl ether FP=free product TBA=ten butyl alcohol I 64tgntr01 xls 164122 Page 7 of 7 HORIZON ENVIRONMENTAL INC