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. TAW GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California l ethyl- total Depth to TQC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (uSAL) u 1L u 1L (up/L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L u 1L at at ms]) feet msl Comments MW-10 10/26/99 420 0.65 0.94 <0.50 0.88 2.9 <0.50 <0.50 <0.50 7.1 <50 <5.0 2.2 <0.50 57.31 25.90 -31.41 no odor!no sheen screened 03/03/00 1100 1.1 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 28 <0.50 <5.0 0.98 <0.50 55.32 -29.42 no odor!no sheen Interval 06122100 980 0.85 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 17 <50 <5.0 0.57 <0.50 54.55 -28.65 no odor 1 no sheen 50.5.70.5 09/28/00 970. 1.1 <0.50 <0.50 <0.50 <5.0 no no no no no no no na 56.87 -30.97 no odor!no sheen 12/22100 760 0.92 <0.50 <0.50 <0.50 <5.0 no no no no no no na no 56.08 -30.18 no odor/no sheen 03/28/01 800 1.4 4.4 0.55 2.9 <5.0 na no no na no no no no 55.09 -29.19 no odor!no sheen 06/27/01 420 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 7.5 <50 <5.0 <0.50 <0.50 56.58 -30.68 no odor 1 no sheen 09106!01 350 <0.50 <0.50 <0.50 <0.50 <5.0 na no no no no no no no 58.61 -32.71 no odor!no sheen 12/04/01 410 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no no 59.21 „3.31 no odor lno sheen 02/28/02 580 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no no 58.04 -32.14 no odor lno sheen 05/20102 440 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 5.9 <50 <5.0 <0.50 <0.50 58.22 27.86 30.36 slight odor/no sheen 08/30/02 270 <0.50 <0.50 <0.50 <0.50 <5.0 no no no na no no no no 61.15 -33.29 no odor I no sheen h 12/08/02 430 <0.50 <0.50 <0.50 <0.50 <0.50 na no no na no na na no 61.58 -33.72 no odor!no sheen 03/07/03 430 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no no 61.04 -33.18 no odor 1 no sheen 06/03/03 480 <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 60.21 -32.35 no odor l no sheen 08128!03 310 <0.50 <0.50 <0.50 <0.50 <0:50 no na no no no no no na 61.61 -33.75 no odor lno sheen 11/25/03 510 <0.50 <0.50 <0.50 <0.50 <0.50 no no no no no no no no 62.56 -34.70 no odor!no sheen 03/01104 490 <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 61.31 25.82 -35.49 no odor 1 no sheen 06/08/04 490 <0.50 <0.50 <0.50 <0.50 <5.0 na no na na na no no no 61.71 -35.89 no odor/no sheen 09/09/04 460 <0.50 <0.50 <0.50 <0.50 <5.0 na no no no no no no no 63.38 -37.56 no odor lno sheen 12/09/04 650 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no no 63.48 -37.66 no odor I no sheen 03110105 510 <0.50 4.5 <0.50 1.7 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 62.31 -36.49 no odor 1 no sheen 05126105 520` <0.50 1.8 <0.50 <0.50 <5.0 no no no no no no no no 61.08 -35.26 no odor 1 no sheen 09/02/05 290" <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no no 61.80 -35.98 no odor 1 no sheen 12/14/05 350' <0.50 <0.50 <0.50 <0.50 e5.0 no no no no no no no no 62.08 -36.26 no odor lno sheen i n i Ilj I I; I l u 474gmr05.,ds { Project No.'1474.48 IIS Page 10 cf 18 HORIZON ENVIRONMENTAL ANC.