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• • TABLE 1 Groundwater Monitoring Data Farmer Beacon Station No 12419 2350 Waterloo Road,Stockton, California ethyl- Depth to TOC GW Well TPHg benzen toluene benzen xylenes MTBE DIPE ETBE TAME TBA melhano ethanal EDC EDB GW Elevation Elevation Number Date (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) 091L) (ug/L) (ug1L) (ug/L) (ug/L)—(ug/L) (ug/L) (ug/L) (ug/L) (feet) (feet sea level)(feet sea level) Comments MW-7 11/12/88 2055 wellhead survey screened 12/30/98 340 48 1 74 22 <5 0 no no no na no no no no 4543 -2488 no odor 1 no sheen interval 03/26/99 550 94 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 23 <50 <5 0 no no 4133 -2078 no odor 1 no sheen 41'-66' 06/02/99 230 <0 50 <0 50 <0 50 <0 50 1 1 <0 50 <0 50 <0 50 28 <50 <5 0 270 <0 50 4076 -2021 no odor 1 no sheen 08/31/99 120 <0 50 <0 50 <0 5o <0 50 12 <0 50 <0 50 <0 50 13 <50 <5 0 160 <0 50 4558 -2501 no comment 12109/99 130 <0 50 <0 50 <0 50 <0 5o <o 50 <0 50 <0 50 <0 50 12 <50 <5 0 98 <0 50 4714 -2659 02121/00 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 84 <50 <5 0 96 <0 50 4556 -2501 no odor 1 no sheen 05/18100 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 68 <50 <5 0 no na 4078 -2023 no odor 1 no sheen 09/26/00 68 <0 50 <0 50 <0 50 <0 50 <5 0 na no no no no no no no 4889 -2834 no odor 1 no sheen 12/20/00 87 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no na no na no 4751 -2696 no odor 1 no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na na no no no 4637 -2582 no odor 1 no sheen MW-8 11/12/98 2038 wellhead survey screened 12/30/98 68 12 076 <0 50 081 <5 0 no na no no no na no no 4536 -2498 no odor!no sheen interval 03/26/99 58 <0 50 <0 50 <0 50 <0 50 51 <0 50 <0 50 <0 50 <5 0 <50 <10 no no 4108 -2070 no odor/no sheen 41'-66' 06/02/99 <50 <0 50 <0 50 <0 50 <0 50 29 <0 50 <0 50 <0 50 <5 0 <50 <5 0 86 <0 50 4052 -2014 no odor I no sheen 08/31199 <50 <0 50 <0 50 <0 50 <0 50 16 <0 50 <0 50 <0 50 <5 0 <50 <50 54 <0 50 4544 -2508 no comment 12/09/99 <50 <0 50 <0 50 <0 50 <0 50 14 <0 50 <0 50 <0 50 45 0 <50 <50 60 <0 50 4701 -2663 02/21100 210 <0 50 <0 50 <0 50 <0 50 20 <0 50 <0 50 <0 50 <5 0 <50 <5 0 69 <0 50 4638 -2500 no odor 1 no sheen 051181011 53 <0 50 <0 50 <0 50 <0 50 18 <0 50 <0 50 <0 50 <5 0 <50 <5 0 no no 4054 -2016 no odor/no sheen 09/26/00 58 <0 so <o 50 <0 50 <0 50 <5 0 na no no no na no na na 4913 -2875 no odor I no sheen 12/20/00 <5o <0 50 061 <0 50 <0 50 <5 0 na no no no na no no no 4752 -2714 no odor/no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <50 na no no no no na na na 4613 -2575 no odor 1 no sheen MW-9 11/12/98 2065 wellhead survey screened 12/30198 1500 73 18 160 64 <25 0 no na no na na no no na 4559 -2494 slight odor/no sheen Interval 03/26/99 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 no no 4139 -2074 no odor 1 no sheen 41'-66' 06/02/99 1300 16 25 76 24 <0 50 <0 50 <0 50 <0 50 13 <50 <5 0 16 <0 50 4074 -2009 no odor 1 no sheen 08/31/99 2400 140 21 460 260 055 <0 50 <0 50 40 50 93 <50 <5 0 42 <0 50 4562 -2497 no comment 12/09/99 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <5 0 13 <0 50 4726 -2661 02/21/00 1900 5o 18 100 60 055 <0 50 <0 50 <0 50 10 <50 88 95 <0 50 4581 -2516 slight odor 1 no sheen 05118100 790 96 081 76 21 <0 50 <0 50 <0 50 <0 50 12 <50 <50 no no 4069 -2024 slight odor I no sheen 09126/00 680 1 1 <0 50 31 087 <5 0 na no no no no no no no 4895 2830 slight odor 1 no sheen 12/21/00 1400 16 1 1 40 120 <60 no na na no na na no no 4762 -2897 slight odor 1 no sheen 03/27/01 1700 61 14 23 220 <5 0 no no na na no na na no 4637 -2572 slight odor 1 no sheen 419gmrOtl fds Page 4 of 6 HORMON ENVUtONMENTAI,WC 141941