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i i I II 4 I TABLE 1 l GROUNDWATER MONITORING DATA Beacon Station No 12474 j 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPtfg benzene tolttene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L (ug/L u 1L (ug/L u 1L (ug/L (ug/L (ug/L (ug/L (ug/L u 1L u 1L1(ug1L) (ug/Lfeet feet msl feet msl Comments MW-5 03/31/98 <50 <0 50 1 50 <0 50 <0 50 <5 0 na na na na na na na na 61 11 2511 1 -3600 screened 06/10/98 <50 <0 501 < 50 <0 50 <0 50 <5 0 ne na na na na na na na 58 41 1 -3330 no odor I no sheen Interval 09108/98 <50 <0 501 <d 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 na na 5841 -3330 no odor I no sheen 65'-86 5' 12/30/98 <50 <0 501 5 089 5 8 <5 0 ne na na na na na na na 5651 -31 40 no odor t no sheen 03/25/99 <50 <0 50 <0.50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 na na 54 54 -29 43 no comment 06103/99 <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 5389 -28 78 no comment 08/30/99 95 1 7 74 2 1 15 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 5604 -3093 no comment 12/10/99 <50 <0 501 <0�50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 5599 -3088 no comment 03103100 <50 <0 50 0 1 <0 50 0 92 <0 50 <0 50 <0 50 <0 50 <5 0 <50 6 0 <0 50 <0 50 5453 -29 42 no odor 1 no sheen 06122!00 <50 <0 501 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 24 <0 50 <0 50 5375 28 64 no odor I no sheen 09/28/00 <50 <0 50 I < X50 <0 50 <0 50 <50 na na na na na na na na 5619 3108 no odor 1 no sheen 12/21100 <50 <0 501111 < 50 <0 50 <0 50 <50 na na na na na na na na 5532 -3021 no odor I no sheen 03/28/01 78 2 5 4 2 1 11 <5 0 na na na na na na na na 5444 -2933 no odor I no sheen 06127/01 <50 <0 50 0 8 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 <0 50 <0 50 5589 -3078 no odor 1 no sheen 09/06101 <50 0 64 1 1 070 20 <5 0 na na na na na na na na 5796 -32 85 no odor 1 no sheen 12103/01 <50 <0 50 1.1 <0 50 <0 50 <50 na na na na na na na na 5845 11-3334 no odor 1 no sheen 02128/02 <50 <0 50! 0 55 <0 50 <0 50 <5 0 na na na na na na na na 5731 -32 20 no odor I no sheen 05/20/02 220 11 4 6 4 31 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 5753 2710 ` 30 43 no odor I no sheen 08129/02 <50 <0 50 <0.50 <0 50 056 <5 0 na na na na na na na na 6053 -33 43 no odor 1 no sheen 12/06/02 <50 073 1.7 <0 50 1 5 <0 50 na na na na na na na na 6071 11-3361 no odor I no sheen 03/05/03 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5987111-3277 no odor 1 no sheen 06/03/03 2100 <0 50 I <0 50 <0 50 <0 50 0 57 <0 50 <0 50 <0 50 <50 <50 <5 0 42 <0 50 5871 -31 61 no odor I no sheen 08/28/03 <50 <0 50# 0 8 <0 5D 1 2 <5 0 na na na na na na na na 6098 -3388 no odor I no sheen 11/25/03 ns ns I fs ns ns ns ns ns ns ns ns ns ns ns 6181 I-34 71 not sampled 03/01/04 630 74 16 3 3 29 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 6050 2505 -3545 no odor 1 no sheen 06/08/04 ns ns r s ns ns ns ns ns ns ns ns ns ns ns 6101 'i-35 96 not sampled 09/09/04 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 62 69 3764 no odor 1 no sheen 12/08/04 ns ns rs ns ns ns ns ns ns ns ns ns ns ns 6279 �; 3774 not sampled 03/10/05 51 079 2 8 <0 50 0 85 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 61 59 -36 54 no odor/no sheen 05125/05 ns ns s ns ns ns ns ns ns ns ns ns ns ns 60 44i-3539 not sampled 09101/05 <50 <0 50{ < 50 <0 50 <0 50 <5 0 na na na na na na na na 61 24 a9-36 19 no odor I no sheen I I i I i �i I ! 1 1 474grrcp5 x* I r 4 Project No 147448 Page 5 of 18 HORIZON ENVIRONMENTAL INC