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Table I -Groundwater Monitoring Data Beacon Station No 641 1210 E Hammer Lane,Stockton,California Well Date TPHg B T E X MTBE DIPS ETBE TAME TBA Meth Eth Depth to TOC GW Number uglL ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L uglL GW Elevatto Elevatto Comments MW-1 11/14/96 14,000 4400 1200 510 1300 1200 no na no no no no 5702 9953 4251 sheen screw 03/18/97 1,900 220 17 <1 3 13 270 no no no no no no 5125 4828 none mtervat 03/31/98 370 28 29 52 15 95 no no no no no no 4909 5044 no sheen,no odor 60'-80' 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 29 no no no no no no 4606 5347 no sheen no odor 09/08/98 840 190 73 <5 0 130 1,100 <0 50 <0 50 081 20 2,200 <5 0 4955 4998 no sheen odor 12/30/98 <50 096 <0 50 <0 50 <0 50 65 no no no no no no 4403 5550 no sheen, odor MW-2 10/02/97 83,000 16,000 18,000 2,600 12,000 940 <10 <10 <10 <1000 <10000 <20000 5564 9884 432 no sheen,no odor semen 03/31/98 1,100 68 6 <0 50 99 14 no no no na no no 4845 5039 no sheen,slight odor Interval 06/10/98 760 20 16 <0 50 16 <5 0 no no no no no no 4541 5343 no sheen slight odor $0'75' 09/08/98 2,000 350 <5 0 62 13 130 <0 50 <0 50 <0 50 24 250 <5 0 4872 50 12 no sheen no odor 12/30/98 97 54 <0 50 <0 50 <0 50 11 no no no no no no 43 31 5553 no sheen no odor MW-3 10/02/97 1,700 90 87 067 26 77 <0 50 <0 50 <0 50 <50 <5000 <1000 5762 9968 4206 no sheen no odor Berm 03/31/98 170 067 <0 50 <0 50 <0 50 <5 0 no no no no no no 4914 5054 no sheen,no odor interval 06/10/98 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no 46 10 5358 no sheen,no odor 50'-75' 09/08/98 <50 45 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 4974 4994 no sheen no odor 12/30/98 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no na no 44 17 55 51 no sheen no odor MW-4 10/02/97 35,000 9,300 600 1,100 3,600 1,800 <5 0 <5 0 <5 0 <506 <50000 <10000 5745 10000 4255 no sheen no odor scran 03/31/98 25000 14 39 <050 75 <50 no no no no no no 4972 5028 no sheen slight odor Interval 06/10/98 2,400 6 12 <050 11 12 no no no no no no 4663 5337 no sheen slight odor W-75' 09/08/98 660 29 1 48 <0 50 120 <0 50 <0 50 <0 50 11 230 <5 0 4987 5013 no sheen no odor 12/30/98 180 <0 50 088 <0 50 12 28 no no no no no no 4456 5544 no sheen no odor MW-5 10/02/97 87,000 2 2,000 10,000 2,000 105000 3,800 <5 0 <50 <50 <500 <50000 <10000 5733 9958 4225 no sheen no odor semat 03/31/98 10,000 2,100 1,500 270 710 530 no no no no no na 4919 5039 no sheen odor interval 06/10/98 3,100 510 470 45 310 180 no no no no no no 4622 5336 no sheen odor 50'-75' 09/08/98 24,000 6,500 1,000 920 1,400 4,500 <2 5 <25 34 48 3,600 <25 4955 5003 no sheen odor 12/30/98 340 32 <25 29 <2 5 980 no no no no no no 44 10 5548 no sheen odor SW-1 10/02/97 ns ns ns ns ns ns ns ns ns ns ns ns 5657 nm nm ns . screen 03/31/98 ns ns ns ns ns ns ns ns ns ns its ns 5123 nm ns interval 06/10/98 ns ns ns ns ns ns us ns ns ns ns ns 4584 nm ns 601-65' 09/08/98 ns ns ns ns ns ns ns ns ns ns ns its 4926 nm ns 12/30/98 ns Its its ns ns ns ns ns ns ns ns ns 4399 nm ns Notes TPHg=total petroleum hydrocarbons as gasoline The seven oxygenated fuel additive compounds byPE A Mgtkpd 8260B pg/L= micrograms per liter=parts per billion(ppb) B=benzene MTBE=methyl tertiary-butyl ether TBA=tertiary butyl alcohol GW=Groundwater T=toluene DIPE=do-isopropyl ether Meth =methanol TOC=Top Of Casing E=ethylbenzene ETBE=ethyl tertiary butyl ether Eth =ethanol no=not analyzed X=xylenes TAME=tertiary amyl methyl ether Depths and Elevations recorded in feet 98gmtbi 641 Page 1 of 1 HORIZON ENVIRONMENTAL INC