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Table 1 Groundwater Monitoring Data Beacon Station No.641 1210 E Hammer Lane,Stockton,California well Date TPHg B T E X MTBE DIPE ETRE TAME TBA Meth Eth. Depth to TOC GW Number n ug& u ugIL u u n n u ugIL u u GW Elevation Elevation Comments MW-1 11/14/96 14,000 4400 1200 510 1300 1200 na na na na na na 5702 9953 4251 sheen screen 03/18/97 I,900 220 17 <1 3 13 270 na na na na na na 5125 4828 none interval 03/31/98 370 28 29 52 15 95 na na na na na na 4909 5044 no sheen,no odor 601-80, 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 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 na na na na na na 4403 5550 no sheen, odor 03/25/99 80 <0 50 <0 50 <0 50 <0 50 68 <0 50 <0 50 <0 50 56 <50 <5 0 4141 5812 odor/no sheen, MW-2 10/02/97 83,000 16,000 18,000 2,600 12,000 940 <10 <10 <10 <1000 <100000 40000 5564 9884 432 no sheen,no odor scram 03/31/98 1,100 68 6 <0 50 99 14 na na na na na na 4845 5039 no sheen,slight odor interval 06/10/98 760 20 16 d)50 16 <5 0 na na na na na na 4541 5343 no sheen,slight odor 50'-75' 09/08/98 2,000 350 <5 0 62 13 130 <0 50 <0 50 <0 50 24 250 <5 0 4872 5012 no sheen,no odor 12/30/98 97 54 <0 50 <0 50 <0 50 11 na na na na na na 4331 5553 no sheen,no odor 03/25/99 74 20 <0 50 <0 50 <0 50 11 <0 50 <0 50 <0 50 <5 0 <50 <5 0 4066 5818 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 screen 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 interval 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 50'-75' 09108M <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 <50 450 <0 50 <0 50 <0 50 <5 0 na na na na na na 4417 5551 no sheen,no odor 03/25/99 <50 <0 50 <0 50 <0 50 <0 50 450 <0 50 <0 50 <0 50 <5 0 <50 <5 0 4157 5811 no sheen,no odor MW4 10/02/97 35,000 9,300 600 1,100 3,600 1,800 <5 0 <5 0 <5 0 <500 <50000 <10000 5745 10000 4255 no sheen,no odor screen 03/31/98 2,000 14 39 <0 50 75 <50 na na na na na na 4972 5028 no sheen,slight odor interval 06/10/98 2,400 6 12 <0 50 11 12 na na na na na na 4663 5337 no sheen,slight odor 50'-75' 09/08/98 660 29 1 48 <0 50 120 <050 <0 50 <0 50 11 230 <50 4987 5013 no sheen,no odor 12/30/98 180 <0 50 088 4 50 1.2 28 na na na na na na 4456 5544 no sheen,no odor 03/25/99 80 <0 50 <050 <0 50 <050 1 80 <0 50 <0 50 <0 50 56 <50 <5 0 1 4194 5806 1 no sheen,no odor 99gmtb!641 Page 1 of 2 HORIZON ENVIRONMENTAL INC