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1 TABLE 1 Groundwater Monitoring Data Beacon Station No 641 1210E H.tmmer Lane,Stockton,California Well TPHg benzene toluene ethylbenzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number 11 Date (ugA) (u A) (ugA) (ugA) (ugA) (ugA) (ugA) (ugA) (u A) (ugA) (ug/1) (ugA) (ugA) (ugA) (feel) (feet mss) (feet msl) Comments VW 3 03/25/99 33000 1600 8100 1800 5400 660 <5 0 <5 0 <5 0 140 <50 <5 0 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 <5 0 <0 50 <0 50 4245 nm slight odor!no sheen Interval 08/31/99 11000 860 230 470 140 6900 <10 <10 <10 300 <1500 <100 <10 <10 4766 nm no comment 45-55 12/09/99 11000 1200 550 560 430 6200 <5 0 <5 0 <5 0 100 <500 <50 <5 0 <5 0 456 nm no comment 03/01100 12000 500 440 680 980 5000 <20 <20 <20 <200 <2000 <200 na na 4294 nm no comment 06/06/00 $900 1400 170 340 260 5600 <2 0 <2 0 39 260 4000 <20 <2 0 <2 0 42 clear VW-4 03/25/99 1 ns as ns ns ns as ns ns ns ns ns as ns as nm nm nm dry screened 06/02199 ns ns AS ns as ns ns as ns as as as as ns nm nm dry interval 08/31/99 ns ns ns ns AS ns as ns ns ns AS ns as ns nm nm dry 25'40 12/09/99 ns AS ns ns ns as ns ns ns as ns as AS ns nm nm dry 03/01/00 ns ns ns ns ns as ns ns ns ns as ns ns ns nm nm dry 06/06/00 ns ns as ns ns ns ns ns ns ns ns AS ns ns nm nm dry VW� 03/25/99 ns ns AS as ns ns ns ns ns ns ns as ns ns nm nm nm 14 screened 06/02199 ns as ns as as ns ns as ns as ns ns AS ns nm nm interval 08/31/99 ns ns as as ns as ns ns ns ns AS ns ns ns 4773 nm 0 05 ft FP/sheen 40-50 12/09/99 100000 13000 10000 570 16000 31000 <20 <20 <20 <200 <2000 <200 <20 <20 457 nm no comment 03101100 27000 5100 520 1500 770 14000 <50 <50 <50 <500 <5000 <500 na na 4247 nm no comment 06/06/00 43000 7700 4600 1300 3700 16000 <10 <10 <10 750 <2500 <100 -10 <10 4184 nm clear VW 6 03/25199 ns as ns ns ns ns as ns ns ns AS ns ns ns nm nm nm screened 06/02/99 ns ns ns ns as ns ns ns AS ns ns as ns as nm nm Interval 08/31/99 ns ns ns as ns ns AS as ns ns ns ns ns ns 4773 nm sheen 22-32 12109199 ns ns AS as ns ns ns ns ns ns ns ns ns as nm nm dry 03/01/00 as ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm dry 06/06/00 ns as ns AS ns as ns AS ns ns ns as ns ns nm nm dry VW-7 03/25/99 25000 5700 3300 1500 1700 2000 <5 0 <5 0 <5 0 200 <50 <5 0 na na 41 67 nm nm slight odor/no sheen screened 06/02/99 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 as ns as ns ns ns ns as ns ns ns ns as 47 35 nm 0 21 fl FP/sheen 40-55 12109199 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 nm no comment 06/06/00 15000 2400 440 620 1100 3000 <50 <5 0 <5 0 280 <2000 <50 <5 0 <5 0 41 5 nm clear VW-8 03125199 ns ns ns ns ns ns as ns ns as ns ns ns as dry nm nm dry screened 06/02/99 ns ns ns as ns ns ns as ns ns ns as ns ns dry nm dry Interval 08/31/99 ns as ns as ns as as ns ns ns as ns ns ns dry nm dry 22 32 12/09/99 AS ns as as ns ns ns ns ns as ns ns ns ns dry nm dry 03101100 ns as as ns as ns ns as ns ns ns ns as ns dry nm dry 06/06/00 ns ns ns ns ns ns as ns ns AS ns ns ns AS dry nm dry Notes TPIIg=total peuolmin hydrocarbons as basohne py/I=micrograms per liter(pans per billion of ppb) MTDE=methyl ten butyl ether GW=groundwater RIPE=dusopropyl ether TOC-top of rasing ETBb=ethyl test buty)ether na=not analysed TAME=ten amyl methyl ether 111—fret,product rBA=ten butyl alcohol 641gmr00 AS 1641 43 Page 3 of 3 HORIZON ENVIRONMENTAL INC