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i OLE 1 *• r GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California ethyl- I Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u !L u IL u 1L u IL u IL u 1L u !L u 1L u 1L u IL u !L u 1L u !L u 1L feet feet sea level feet sea level Comments MW-4 03131!98 75 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no no no no na 4792 2000 2792 screened 06110198 58 <0 50 <0 50 <0 50 <0 50 <5 0 I no no na no no no no na 4221 2221 interval 09108198 5o 1 3 14 <0 50 24 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na no 4664 2664 no odor 1 no sheen 48 70 11117198 ns ns ns ns AS ns Is ns ns ns ns no ns ns 2000 wellhead survey 12130/98 68 14 087 <0 50 1 1 <5 0 no no no no no no no no 4500 2500 no odor f no sheen 03126/99 74 <0 5D <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5o <20 no no 4075 2075 no odor I no sheen 06/02/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 32 <0 50 4019 2019 no odor 1 no sheen 08/31/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 1050 1050 <50 <50 <5 0 43 <0 50 4509 2509 no comment 12/09/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 69 <50 <5 0 49 <0 50 4656 2656 02/21/00 68 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 -450 30 <0 50 4494 2494 no odor 1 no sheen 05/18100 62 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 no na 3923 1923 no odor 1 no sheen 09126/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na na no na no na na 4855 2855 no odor 1 no sheen 12120100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no no no na 4698 2696 no odor 1 no sheen 03/27101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no na 4571 2571 no odor 1 no sheen 06/26101 <50 <0 50 <0 50 <0 50 <0 50 i<0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 4840 2840 no odor 1 no sheen 09105101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no no na no 5355 3355 no odor 1 no sheen 11130101 <50 <0 50 <0 50 <0 50 <0 50 '50 no no no na no no na no 5339 3339 no odor 1 no sheen 02/27/02 <50 <0 50 <0 50 -050 <0 50 <50 no no na no no no no na 5009 3009 no odor 1 no sheen 05/16/02 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 -.50 43 <0 50 5027 21 56 2871 no odor 1 no sheen 09/12/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no na 5846 3690 no odor 1 no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 1 no no no na no no no na 5660 3504 no odor 1 no sheen 02117/03 110 <0 50 <0 50 <0 50 <0 50 <0 501 na no no no na no no no 5344 31 88 no odor 1 no sheen 06/02/03 <50 <0 50 <0 50 <0 50 <0 5D <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 74 <D 50 5284 3128 no odor 1 no sheen 09/18/03 ns ns ns ns ns no ns ns ns ns ns ns ns ns nm nm not sampled 11/24/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no na no na no no no no 5791 3635 no odor 1 no sheen 02/23/04 60 <0 50 <0 50 4050 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 59 <0 50 5436 3280 no odor 1 no sheen 06/07104 ns ns ns ns ns ns ns ns ns ns ns no ns ns 5463 3307 not sampled 09/07104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61 39 39 83 not sampled 12/10104 ns ns ns ns ns ns 1 no ns ns ns ns ns ns ns 5884 3728 not sampled 0310=5 <50 <0 50 <0 50 <0 50 <0 50 j<0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 37 <0 50 5525 3369 no odor 1 no sheen 05124105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 50 34 2878 not sampled } 08!31105 ns ns ns ns ns i ns 1 ns ns ns ns ns ns ns ns 5557 3401 not sampled ji 3I w ! I II { I I j 41 Dgnwo As P,opUr4o 141948 Page 4 of 13 HORIZON ENVIRONMENTAL INC i I