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OLEI . GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2354 Waterloo Road,Stockton,California ethyl- Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u 1L u !L 2 u A u L u u A u !L u 1L u L u IL u u !L u IL feet feet sea level feet sea level Comments MW4 03131198 75 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 4792 2000 2792 screened 06110!98 58 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 4221 2221 interval 09108198 50 1 3 1 4 <0 50 24 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 no no 4664 2664 no odor 1 no sheen 48 70 11112/98 ns ns as as ns as n$ ns ns as as as ns ns 2000 wellhead survey 12!30198 68 14 087 <0 50 1 1 <5 0 no no no no no no no no 4500 25 DO no odor I no sheen 03!26!99 74 <0 50 <0 50 <0 50 <D 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <20 no no 4075 2075 no odor 1 no sheen 06102/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 32 <0 50 4019 2019 no odor!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 <50 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 02121100 68 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 30 <0 50 4494 2494 no odor 1 no sheen 05118100 62 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 no no 3923 1923 no odor 1 no sheen 09126100 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no no na na no 4855 2855 no odor 1 no sheen 12/20100 <50 <0 50 <0 50 <0 50 <0 50 <50 no na no no no no n8 no 4698 2698 no odor 1 no sheen 03/27101 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no no no no no 4571 2571 no odor!no sheen 06!26!01 <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 4840 2840 no odor 1 no sheen 09!05101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 5355 3355 no odor 1 no sheen 11/30101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na no no na no no no no 5339 3339 no odor I no sheen 02/27/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 5009 3009 no odor I no sheen 05116102 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <D 50 <0 50 <50 <50 <5 0 43 <0 50 5027 2156 2871 no odor 1 no sheen 09112!02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 5846 3690 no odor I no sheen 12!04102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 5660 3504 no odor I no sheen 02117!03 110 <0 50 <0 50 <0 50 <0 50 <0 50 no no na no no no no no 5344 3188 no odor 1 no sheen 06/02103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 74 <0 50 5284 31 28 no odor 1 no sheen 09!18103 as as as as as as as ns as ns as as as as nm am not sampled 11!24103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no no no no no no na no 5791 3635 no odor I no sheen 02/23104 60 <0 50 -050 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 59 <0 50 5436 3280 no odor I no sheen 06107104 as as as as ns as as as as ns as as as ns 5463 3307 not sampled 09107104 ns as as ns ns as ns ns as ns as as as as 6139 3983 not sampled 12110!04 as as as ns as as as as as ns ns as as as 5884 3728 not sampled 03/08105 <50 <0 50 <0 50 <0 50 -9050 <050 <050 <050 <050 <50 <50 <5 0 37 <D 50 5525 3369 no odor!no sheen 05/24105 ns as as as as as AS ns as ns ns as ns as 5034 2879 not sampled 08/31/05 as ns as as AS his as as as as ns as ns ns 5557 3401 not sampled 41 agm'o:s�� P-1-d No 141048 page 4 of 13 HORIZON ENVIRONMENTAL INC