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Mel • r Groundwater Monitoring Data Beacon Station No. 641 1210 E. Hammer Lane, Stockton, California Well Date TPHg B T E X MTBE D1PE ETBE TAME TBA Meth Eth EDC EDB Depth to TOC GW Number ug[L ug/L ug/L ug/L ug/L ug/L ug/]L uglL ug/L ug/L ug/L ug/L ug/L ug/L GW Elevatto Elevatto Comments MW-I 11/14/96 14,000 4,400 1,200 510 1,300 1,200 no na no no no na no na 5702 9953 4251 sheen screw 03/18/97 1,900 220 17 <l 3 13 270 no no na no no no na no 5125 4828 none itt" 03/31/98 370 28 29 52 15 95 na no no no na no no no 4909 5044 no sheen no odor W-80' 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 29 no na no no no no na 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 no no 4955 4998 no sheen, odor 12/30/98 <50 096 <0 50 <0 50 <0 50 65 na no na no no no no no 4403 55 50 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 no no 4141 58 12 odor!no sheen, 06/02/99 60 <0 50 <0 50 <0 50 <0 50 45 <1 0 <10 <1 0 <10 <50 <10 <10 <1 0 4250 5703 odor 1 no sheen, 08/31/99 1,500 82 36 54 30 3,400 <0 50 <0 50 13 140 <500 <5 0 <0 50 <0 50 48 10 5143 no comment 12/09/99 69 1 12 25 <0 50 24 640 <0 50 <0 50 <0 50 64 <50 <5 0 <0 50 <0 50 4486 5467 no comment MW-2 10/02/97 83,000 16,000 18,000 2,600 12,000 940 <10 <10 <10 <1000 <10000 <20000 no no 5564 9884 4320 no sheen,no odor Screen 03/31/98 1,100 68 6 <0 50 99 14 na no no no na no no no 4845 5039 no sheen slight odor wteml 06/10/98 760 20 16 <0 50 16 <5 0 no no no no no na no no 4541 5343 no sheen,slight odor W-75' 09/08/98 2,000 350 <5 0 62 13 130 <0 50 <0 50 <0 50 24 250 <5 0 no na 4872 50 12 no sheen no odor 12/30/98 97 54 <0 50 <0 50 <0 50 11 no no no no na na no no 4331 55 53 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 no na 4066 58 18 no sheen,no odor 06/02/99 1,700 52 090 46 1 1 19 <0 50 <0 50 <0 50 37 <50 <5 0 <0 50 <0 50 4170 57 14 no sheen,no odor 08/31/99 5,600 1,100 26 400 110 930 <2 0 <2 0 <2 0 100 <200 <20 27 <2 0 4734 51 50 no comment 12/09/99 420 1 <0 50 <0 50 <0 50 <0 50 720 <0 50 <0 50 0 51 40 <50 <5 0 080 <0 50 44 18 5466 no comment MW-3 10/02/97 1,700 90 87 067 26 77 <0 50 <0 50 <0 50 <50 <5000 <1000 no no 5762 9968 4206 no sheen no odor 30M 03/31/98 170 067 <0 50 <0 50 <0 50 <5 0 no no na na no no no no 4914 5054 no sheen,no odor lnterval 06/10/98 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 4610 5358 no sheen no odor SO'-75' 09/08/98 <50 45 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 no na 4974 4994 no sheen no odor 12/30/98 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 44 17 5551 no sheen no odor 03125!99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 no no 4157 58 11 no sheen no odor 06/02/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 54 <50 <5 0 <0 50 <0 50 4267 5701 no sheen,no odor 08/31/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 48 17 51 51 no comment 12/09/99 <50 1 <0 50 <0 50 <0 50 <0 50 3 1 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 4496 5472 no comment MW-4 10/02/97 35,000 9,300 600 1,100 3,600 1,800 <5 0 <5 0 <5 0 <500 <50000 <10000 no no 5745 10000 4255 no sheen no odor screen 03/31/98 2,000 14 39 <050 7 5 <50 no no no na no no no na 4972 5028 no sheen,slight odor irtk"al 06/10/98 2,400 6 12 <0 50 1 1 12 no na no no no no no no 4663 5337 no sheen,slight odor SW-75' 09/08/98 660 29 1 48 <0 50 120 <0 50 <0 50 <050 11 230 <5 0 na na 4987 50 13 no sheen no odor 12/30/98 180 <0 50 088 <0 50 12 28 no no na no no no na no 4456 5544 no sheen no odor 03/25/99 80 <050 <0 50 <0 50 <0 50 80 <0 50 <0 50 <050 56 <50 <5 0 no no 4194 5806 no sheen no odor 06/02/99 160 <0 50 <0 50 <050 <0 50 41 <050 <0 50 <0 50 25 <50 <50 <0 50 <0 50 4290 57 10 no sheen no odor 08/31/99 460 86 <0 50 085 <050 540 <050 <0 50 <050 40 <50 <50 <0 50 <050 4839 5161 no comment 12/09/99 1 <50 1 <0 50 <0 50 <050 <0 50 1 440 <0 50 <050 <0 50 24 <50 <50 1 <0 50 <0 50 1 45 46 5454 no comment 99gmtbl 641 Page i of 3 HORIZON ENVIRONMENTAL INC