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I, i' TABLE 1 II GIROUNDWATER MONITORING DATA 11 { Former Beacon Station No 12419 1 2350 Waterloo Road, Stockton,California ethylII Depth 10 TOC GW 1 Well TPHg benzene toluene benzene xylenes MTBE] D1PE ETBE TAME TBA methanol ethanal DCA EDB GW Elevation Elevation /L Number Date u u u u u L u (ug/L) ( g/L) { g1L) ( g/L} ( g1 ) ( gIL)' {uglLj (uglL)�I (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW-4 03/31/98 75 <0 50 <0 50 <0 50 <0 50 6 0 1,1 naIno no no na na na no 4792 2000 2792 I screened 06110M 58 <0 50 <0 50 <0 50 <0 50 <5 0 # na no na na na no no no 4221 2221 interval 09/08198 50 13 14 <0 50 24 <0 50 I <0 50 <0 50 4 50 <50 <50 <50 no na 4664 2664 no odor 1 no sheen 4B 70 11112M ns ns ns ns ns ns ns AS ns ns ns ns AS ns 2000 wellhead survey I 12130198 68 1 4 087 <0 50 1 1 <50 ;5 no no no no no no no na 4500 2500 no odor 1 no sheen I 03/26/99 74 4 50 <0 50 <0 50 <0 50 <0 50 <0 501 <0 501 <0 50 <5 0 <50 <20 no na 4075 2075 no odor!no sheen 06/02/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 �0 50 <5 0 <50 <50 32 '050 4049 2019 no odor!no sheen 08/31/99 <50 <0 5o <0 50 <0 50 <0 50 4 50 I <0 50I -050 <0 50 <5 0 <50 <50 43 <0 50 4509 2509 no comment I 12/09/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 1 '050 <0 501 <0 50 69 <50 <50 49 <0 50 4656 2656 02/21/00 fib <0 50 <0 50 <0 50 <0 50 <0 50 t <0 50 <0 50 '050 <5 0 <50 <50 30 <0 50 4494 2494 no odor/no sheen 05/18/00 62 4 50 <0 50 <0 50 <0 50 <0 50 <0 501 <0 501 <0 50 <5 0 <50 <50 na na 3923 1923 no odor 1 no sheen 09/26100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 1 no no no na no no na no 4855 2855 no odor 1 no sheen 12/20100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 r I na no na na no na no 4698 2698 no odor 1 no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no na na na no 4571 2571 no odor)no sheen 06/26101 c50 <0 50 <0 50 <0 50 <0 50 <0 50 11 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 4840 2840 no odor/no sheen 09105/01, <50 <0 50 <0 50 <0 50 <0 50 <5 0 Ili no na no no na no no no 5355 3355 no odor/no sheen 11130/01 <50 <0 50 4050 -050 <0 50 450 " no no na no no no no n0 5339 3339 no odor/no sheen 02127/02 <50 <0 50 <0 50 <0 50 <0 50 <50 ; na na na no no no na na 5009 3009 no odor I no sheen 05/16102 <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 1 no sheen 09112/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na no na no no no no 5846 3690 no odor/no sheen I 12104/02 <50 <0 50 '4050 <0 50 <0 50 <5 0 no na no no na no na na 5660 3504 no odor 1 no sheen I 02/17/03 110 <0 50 4 50 4 50 <0 50 -050 no no no no no no no no 5344 31 88 no odor 1 no sheen 06/02103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 h <0 50 <0 50 0 50 <5 0 <50 <50 74 <0 50 5284 3128 no odor 1 no sheen I 09/18/03 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 i no 1 no no no na na no na 5791 3635 no odor 1 no sheen 02/23/04 60 <0 50 <0 50 <0 50 <0 50 <050 <0 50 <0 50 <0 50 <5 0 <50 <5 0 59 <0 50 5436 3280 no odor 1 no sheen 06/07/04 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 I` ns ns ns ns ns ns ns ns 6139 3983 not sampled 12/10/04 ns ns ns ns ns ns �i ns ns ns ns ns ns ns ns 5884 3728 not sampled 1� I� , I j I i; l I I _ 1 I I � I h Ir I I I 1 r i 419wnm als • I Proloctrolecl No tat �^, Page 4� HORIZON ENVIRONM C h