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E1 GROUNDWATE MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California ethyl- Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBAmethanol ethanol DCA EDB GW Elevation Elevation Number Date (u 7L) (ug/L (u 1L) ug/L) (uglL) (u IL) (u L (u IL) (u 1L) (ugll- (u IL) (u 7L) �(ug/[-) (u L) (feet) (feet sea level) (feet sea level) Comments MW-4 03/31/98 75 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4792 2000 -2792 screened 06110M 58 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4221 -2221 interval 09/08/98 50 13 14 <0 50 24 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 4664 -2664 no odor I no sheen 48'-70' 11112198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 20 00 wellhead survey 12/30798 68 14 087 <0 50 1 1 <5 0 na na na na na na na na 4500 -2500 no odor!no sheen 03!26199 1 74 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <20 na na 4075 -2075 no odor!no sheen 06/02799 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 32 <0 50 4019 -2019 no odor I no sheen 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 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 <50 49 <0 50 4656 -2656 02121700 68 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 30 <0 50 4494 -2494 no odor 7 no sheen 05118700 62 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 3923 1923 no odor 1 no sheen 09126700 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4855 -2855 no odor I no sheen 12/20/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4691 -2698 no odor!no sheen 03/27101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4571 -2571 no odor 1 no sheen 06126701 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 <0 50 <0 50 4840 -2840 no odor 1 no sheen 09105/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5355 -3355 no odor I no sheen 11130701 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5339 -3339 no odor I no sheen 02/27/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5009 -3009 no odor!no sheen 05116102 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 43 <0 50 5027 21 56 -2871 no odor!no sheen 09/12702 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 58 4" -36 90 no odor!no sheen 12704/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5660 -3504 no odor!no sheen 02!17103 110 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5344 -3188 no odor 1 no sheen 06102103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 74 <0 50 5284 -3128 no odor 1 no sheen 09118103 ns ns ns ns ns ns 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 na na na na na na na na 5791 -3635 no odor 1 no sheen 02/23/04 60 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 59 <0 50 5436 -3280 no odor I no sheen 06107104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5463 -3307 not sampled 09/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61 39 3983 not sampled 12!10104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5884 -3728 not sampled 03108/05 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 37 <0 50 5525 -3369 no odor 1 no sheen 05/24/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5034 -2878 not sampled 08/31/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5557 -3401 not sampled 12712/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5269 31 13 not sampled 419gmr05 Project No 1419 48 Page 4 of 16 HORIZON ENVIRONMENTAL INC