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T�1 .• GROUNDWATER MONITORING DATA Beacon Station No 12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number I Date (ug/L (ug/L u 1L (ug/L (ug/L u IL u 1L u 1L u 1L ug/L)( (ug/L (ug/L (ug/L u 1L feet feet ms]) feet msi Comments MW-2 03/31/98 5000 1100 86 71 270 <25 0 na na na na na na na na 6145 2542 3603 screened 06110/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 5876 -3334 no comment interval 09/08/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 5882 -3340 no comment 76'-91 5' 12/30/98 ns ns ns ns ns ns ns ns ns ns ns ns na na 5683 3141 no comment 03125/99 1600 130 1 7 1 1 50 062 <0 50 <0 50 <0 50 61 <50 25 na na 5490 2948 no comment 06/03/99 14000 8300 730 510 2100 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 28 072 5427 2885 no comment 06130/99 42000 9900 5000 1200 5800 062 20 <0 50 <0 50 <50 <50 <5 0 45 40 5648 -3106 no comment 12/10199 12000 1900 680 330 1200 <5 0 <5 0 <5 0 <50 <50 <50 <100 <50 <50 5633 -3091 no comment 03103/00 5100 1800 33 160 62 <50 <5 0 <5 0 <5 0 <50 <50 <50 <5 0 <5 0 5491 2949 no odor/no sheen 06/22/00 22000 5900 530 630 1700 85 <50 <5 0 <5 0 <50 <500 <200 <50 <5 0 5414 -2872 slight odor/no sheen 09/28/00 16000 4100 800 260 1500 <50 na na na na na na na na 5655 31 13 slight odor/no sheen 12122/00 6100 1200 120 200 330 <50 na na na na na na na na 5573 -3031 slight odorino sheen 03/28/01 31000 7600 610 1000 3300 <200 na na na na na na na na 5469 2927 odorino sheen 06127101 21000 5800 570 640 2100 <25 <25 <25 <25 <250 <5000 1900 <25 <25 5648 3106 odor/no sheen 09!06101 8900 2000 500 210 840 <100 na na na na na na na na 5867 -3325 odor/no sheen 12/04101 28000 6700 1600 910 4000 <250 na na na na na na na na 58 98 -3356 odor/no sheen 03101/02 57000 12000 1200 1400 6100 <500 na na na na na na na na 5762 3220 odorino sheen 05/20/02 53000 11000 1500 1300 6200 <50 <50 <50 <50 <500 <5000 <500 <50 <50 5791 2744 -3047 no odor 1 no sheen 08/30/02 51000 9900 3200 1300 6100 <500 na na na na na na na na 6095 -3351 odor/no sheen 12/06/02 29000 6400 580 770 3300 <25 na na na na na na na na 6108 -3364 odorina sheen 03/07/03 43000 10000 770 1300 4400 <500 na na na na na na na na 60 28 3284 odorino sheen 06103/03 11000 2200 290 310 960 <10 <10 <10 <10 <100 <1000 <100 21 <10 5909 -3165 odor/no sheen 08/28/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11/25/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6228 -34 64 not sampled 03101/04 20000 6100 94 710 1200 <20 <20 <20 <20 <200 <2000 <200 <20 <20 6094 2552 3542 odor/no sheen 06108/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6145 3593 not sampled 09108/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6319 -3767 not sampled 12108/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6325 -3773 not sampled 03/10/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 05125/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6085 -3533 not sampled Project No xis Page 2 of 18 HORIZON ENVIRONMENTAL IHC Project No 1474 48 � 9