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<br /> Table 1 -Groundwater Monitoring Data
<br /> Beacon Station No 641
<br /> 1210E Hammer Lane,Stockton,California
<br /> Well Date TPHg B T E X MTBE DIPE ETBE TAME TBA Meth Eth Depth to TQC GW
<br /> Number ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L GW Elevatio Elevatio Comments
<br /> MW-1 11/14/96 14,000 4400 1200 510 1300 1200 na na na na na na 5702 9953 4251 sheen
<br /> 03/18/97 1,900 220 17 <13 13 270 na na na na na na 5125 4828 none
<br /> 03/31/98 370 28 29 52 15 95 na na na na na na 4909 5044 no sheen,no odor
<br /> 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 29 na na na na na na 4606 5347 no sheen,no odor
<br /> 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
<br /> 12/30/98 <50 096 <0 50 <0 50 <0 50 65 na na na na na na 4403 5550 no sheen, odor
<br /> MW-2 10/02/97 83,000 16,000 18,000 2,600 12,000 940 <10 <10 <10 <1000 <10000 <20000 3564 9884 432 no sheen,no odor
<br /> 03/31/98 1,100 68 6 <0 50 99 14 na na na na na na 4845 5039 no sheen slight odor
<br /> 06/10/98 760 20 16 <0 50 16 <5 0 na na na na no na 4541 5343 no sheen,slight odor
<br /> 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
<br /> 12/30/98 97 54 <0 50 <0 50 <0 50 11 na na na na na na 43 31 5553 no sheen,no odor
<br /> 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
<br /> 03/31/98 170 067 <0 50 <0 50 <0 50 <5 0 na na na na na na 4914 5054 no sheen no odor
<br /> 06/10/98 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na 4610 5358 no sheen,no odor
<br /> 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
<br /> 12/30/98 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na 4417 5551 no sheen no odor
<br /> MW4 10/02/97 35,000 9,300 600 1,I00 3,600 1,800 <5 0 <5 0 <5 0 <500 <50000 <10000 5745 100 00 4255 no sheen no odor
<br /> 03/31/98 2,000 14 39 <0 50 75 <50 na na no na na na 4972 5028 no sheen slight odor
<br /> 06/10/98 2 400 6 12 <0 50 1 1 12 na na na na na na 4663 5337 no sheen slight odor
<br /> 09/08/98 660 29 1 48 <0 50 120 <0 50 <050 <050 11 230 <5 0 4987 5013 no sheen,no odor
<br /> 12/30/98 180 <050 088 <0 50 12 28 na na na na na na 4456 5544 no sheen,no odor
<br /> MW-5 10/02/97 87,000 21,000 10,000 2,000 10,000 3,800 <5 0 <5 0 <50 <500 <50000 <10000 5733 9958 4225 no sheen,no odor
<br /> 03/31/98 10,000 2,100 1,500 270 710 530 na na na na na na 4919 5039 no sheen odor
<br /> 06/10/98 3,100 510 470 45 310 180 na na na na na na 4622 5336 no sheen, odor
<br /> 09/08/98 24,000 6,500 1,000 920 1,400 4,500 <2 5 <2 5 34 48 3,600 <25 4955 5003 no sheen, odor
<br /> 12/30/98 340 32 <2 5 29 <25 980 na na na na na na 4410 5548 no sheen, odor
<br /> SW-1 10/02/97 ns ns ns ns ns ns ns ns ns ns ns ns 5657 nm nm ns
<br /> 03/31/98 ns ns ns ns ns ns ns ns ns ns ns ns 5123 nm ns
<br /> 06/10/98 ns ns ns ns ns ns ns ns ns ns ns ns 4584 nm ns
<br /> 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns 4926 nm ns
<br /> 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns 43 99 nm ns
<br /> Notes
<br /> TPHg=total petroleum hydrocarbons as gasoline The seven allgenated fuel additive compounds by EPA Method 8264)} pg/L= micrograms per liter=parts per billion(ppb)
<br /> B=benzene MTBE=methyl tertiary-butyl ether TBA=tertiary butyl alcohol GW=Groundwater
<br /> T=toluene DIPE di-isopropyl ether Meth =methanol TOC=Top Of Casing
<br /> E=ethylbenzene ETRE=ethyl ternary butyl ether Eth =ethanol na=not analyzed
<br /> X=xylenes TAME=tertiary amyl methyl ether Depths and Elevations recorded in feet
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<br /> 98gmtbl 641 Page 1 of 1 HORIZON ENVIRONMENTAL INC
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