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GROUNDWATER MONITORING DATA Beacon Station No 12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Wel! TPI-Ig benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L. (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L u 1L feet feet msl feet msl Comments MW-2 03/31/98 5000 1100 86 71 270 <25 0 na na na na no no no no 6145 2542 -3603 screened 06/10/98 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 no no 5882 -3340 no comment 76'-91 5 12!30198 ns ns ns ns ns ns ns ns ns ns ns ns no no 5683 3141 no comment 03/25/99 1600 130 17 1 1 50 062 4050 4050 4050 61 <50 25 no no 5490 2948 no comment 06/03/99 14000 8300 730 510 2100 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 28 072 5427 -2885 no comment 08/30/99 42000 8900 5000 1200 5800 062 20 <0 50 <0 50 <5 0 <50 <50 45 40 5648 -3106 no comment 12/10/99 12000 1900 680 330 1200 <5 0 <5 0 <50 <50 <50 <50 <100 <5 0 <5 0 5633 -3091 no comment 03/03/00 5100 1800 33 160 62 <5 0 <5 0 <50 <50 <50 <50 <50 <50 <50 5491 -2949 no odor I no sheen 06/22100 22000 5900 530 630 1700 85 <5 0 <5 0 <5 R <50 <500 <200 <5 0 <5 0 5414 -2872 slight odor/no sheen 09/28/00 16000 4100 800 260 1500 <50 na no no na no no no no 5655 -3113 slight ododno sheen 12122100 6100 1200 120 200 330 <50 no no na na no no no no 5573 -3031 slight ododno sheen 03/28/01 31000 7600 610 1000 3300 <200 na no no na no no no no 5469 -2927 ododno sheen 06/27/01 21000 5800 570 640 2100 <25 <25 <25 <25 <250 <5000 1900 <25 <25 5648 -3106 ododno sheen 09/06/01 8900 2000 500 210 840 <100 no no na no na no no no 5867 -3325 ododno sheen 12/04101 28000 6700 1600 910 4000 <250 no no no no na na na no 5898 -3356 ododno sheen 03/01/02 57000 12000 1200 1400 6100 <500 no no no no na no no no 5762 -3220 ododno sheen 05/20102 53000 11000 1500 1300 6200 <50 <50 <50 <50 <500 <5000 <500 <50 <50 5791 2744 -3047 no odor/no sheen 08130102 51000 9900 3200 1300 6100 <500 no no no no no no no no 6095 -3351 ododno sheen 12106102 29000 6400 580 770 3300 <25 no no no no no no no no 61 08 -3364 ododno sheen 03/07/03 43000 10000 770 1300 4400 <500 no no no na no no no na 6028 3284 ododno sheen 06103103 11000 2200 290 310 960 <10 <10 <10 <10 <100 <1000 <100 21 <10 5909 -3165 ododno sheen 08/28/03 ns ns ns ns ris ns ns ns ns ns ns ns ns ns nm nm not sampled 11125103 ns ns ns ns ns no ns ns ns ns ns ns ns ns 6228 -34 84 not sampled 03/01/04 20000 6100 94 710 1200 <20 <20 <20 <20 <200 <2000 <200 <20 <20 6094 2552 -3542 ododno sheen 06108/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6145 -3593 not sampled 091D8104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6319 -3767 not sampled 12!08104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6325 -3773 not sampled 03110/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 05/25105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6085 -3533 not sampled 09/01/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61 81 -3629 not sampled I xis Projed No 6474 48 Page IStie 2 of 18 HORIZON ENVIRONMAL INC rgect