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I TABLE 1 GROUNDWATER MONITORING DATA ,J Former Beacon Station No 12419 I ,I 2350 Waterloo Road, Stockton, California ethyl- 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) (ug/L) (ug/L) ug/L) (u !L) (u /L) (ug/L) (ug/L) (u L) (ug/L (ug/L) (ug/L) (ug/L) (u IL) (feet) (feet sea level} (feet sea level) Comments MW 7 11!12198 ns ns ns ns ns ns nsf ns' ns ns ns ns ns ns 2055 wellhead survey screened 12/30/98 340 48 1 74 22 <50 I no[ nal na na na na na na 45 43 24 88 no odor!no sheen interval 03126!99 550 94 <0 50 <0 50 <0 50 <0 504i <0 50 <0 50 <0 50 -23 <50 <50 no na 4133 -2078 no odor 1 no sheen 41'-66' 06102!99 230 <0 50 <0 50 <0 50 c0 50 1 1 {, c0 50 c0 50 <0 50 }28 <50 <50 270 <0 50 4076 -2021 no odor 1 no sheen 08131/99 120 <0 50 c0 50 <0 50 <0 50 12 j <0 50 <0 50 <0 50 '13 <50 <50 160 <0 50 4556 25 01 no comment 12/09/99 130 <0 50 <0 50 <0 50 <0 50 <0 50i1 <0 50 <0 50 <0 50 12 <50 <5 0 98 <0 50 47 14 p i -26 59 02!21100 130 <0 50 <0 50 <0 50 <0 50 <0 50{, <0 50 <0 50 <0 50 84 <50 <50 96 <0 50 4556 2501 no odor 1 no sheen 05118100 120 <0 50 <0 50 <0 50 <0 50 <0 5V <0 50 <0 50 <0 50 68 <50 <5 0 no no 4078 -2023 no odor!no sheen 09126/00 68 <0 50 <0 50 <050 <0 50 <5 0 na no na na no no no no 4889 -2834 no odor 1 no sheen` 12120100 87 <0 50 c0 50 <050 <0 50 15 0;j na na no na no na no no 4751 -2696 no odor 1 no sheen 03127101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 nail nal na na no na no no 4637 n -2582 no odor!no sheen 06!26101 <50 c0 50 <0 50 <0 50 <0 50 <0 501 -05110 <0 50 <0 50 �5 0 <50 <50 33 <0 50 4903 -2848 no odor!no sheen 09105101 68 <0 50 <0 50 <0 50 1050 <5 0 i nal na no no no no no no 5406 -3351 no odor I no sheen 11130101 97 <0 50 <0 50 <0 50 <0 50 <50 r nal na ' no °no no no na no 5401 -3346 no odor!no sheen 02/26/02 66 <0 50 <0 50 <0 50 <0 50 <50 no ft na no Ina no no no no 5065 -3010 no odor 1 no sheen 05116/02 87 <0 50 <0 50 <0 50 <0 50 c0 501 <0 50 <0 50 <0 50 <5 0 <50 <50 26 <0 50 5071 2211 -2860 no odor 1 no sheen 09112102 77 <0 50 <0 50 <0 50 <0 50 <50+° nail no no no na na no no 5873 -3662 no odor!no sheen 12/04102 <50 <0 50 <0 50 <0 50 c0 50 <50±;11 na+ na no no no no no no 5724 ' -3513 no odor!no sheen 02J1 7103 <5Q <0 5D <0 50 <0 511 c0 50 <0 50, na na no no no na no no 5408 -3197 no odor 1 no sheen 06!02!03 <50 <0 50 <0 50 <0 50 <0 50 <050;� <0 50 <0 50 <0 50 <50 1<50 <50 16 <0 50 5331 -3120 n0 odor 1 no sheen 119!18103 <50 <0 50 c0 50 <0 50 <G50 <5 0 'i! no 1 na I no no na no na no 5963 ' 37 52 no odor I no sheen 11!24!03 ns ns ns ns ns ns {i ns ns ns ns ns ns ns ns 58 44 3633 not sampled 02123!04 <50 <0 50 <0 50 <0 50 <0 50 <0 50 r <0 50 <0 50 <0 50 <50 <50 12 70 <0 50 5497 -3286 no odor 1 no sheen 06107104 ns ns ns ns ns ns ns] ns' ns ns ns ns ns ns 5517 33 06 not sampled 09107!04 c50 <0 50 <0 50 <0 50 <0 50 0 70 I` na li na no no ` no na no no 6062 -3851 no odor!no sheen12/10/04 ns ns ns ns ns ns " ns 4 ns' ns ns ns ns ns ns 5942 -3731 not sampled 03108105 <50 <0 50 <0 50 <0 50 <0 50 <0 50', <0 50 <0 50 <0 50 <5 0 <50 <5 0 57 <0 50 5585 -3374 odor I no sheen 05124105 ns ns ns ns ns ns �1 ns I ns! ns ns ns ns ns ns 5094 -2883 not sampled 08!31105 <50 <0 50 <0 50 <0 50 <0 50 <50 , no nay no no no no no no 5.596 -3385 no odor 1 no sheen 12112105 ns ns ns ns ns ns + ns I nsI ns ns ns ns ns ns 5537 -3326 not sampled 1 tE Ii I t t 419gm Il Project 048 1 � P4 16 HORIZON ENVIRONIOAL Via i 1 �