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h TAS GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California V ethyl- total Depth to TOC GW Well TPFlg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date u 1L (ug/L (ug/L u 1L (ug/L1(ug1L)1(ug1L) (ug/L (ug/L (29!0 ug1L u 1L (ug/L (ug/L feet feet ms feet msl Comments AS-1 F03128101 9 1700 100 7.7 26 27 5.0 <0.50 <0.50 <0.50 <5.0 <50 200000 5.6 <0.50 60.94 nm nm no odor 1 no sheen screened00 <200 8.0 <2.0 3.2 <2.0 11 <2.0 <2.0 <2.0 <20 <0.50 69000 <2.0 <2.0 55.51 nm no odor/no sheen Interval00 <200 8.3 2.8 3.2 4.2 10 <2.0 <2.0 <2.0 <20 <200 55000 <2.0 <2.0 54.84 nm no odor 1 no sheen 70.5.75.5' 0 200. 5.3 1.2 1.9 2.1 10 no na na no no no no no 56.63 nm no odor 1 no sheen 0 96 2.0 1.1 <0.50 0.62 32 no no no no no no no na 56.51 nm no odor 1 no sheen 1 1200 70' 220 28 120 <10 no no no no no na no no 56.02 nm no odorino sheen 1 600 21I 43 3.4 3.9 7.7 <0.50 <0.50 <0.50 7.6 <50 13000 1.4 <0.50 56.80 nm no odor 1 no sheen 1 610 19 35 14 32 6.8 na no no no no no na no 58.81 nm no odor f no sheen 1 4900 540 350 170 880 <25 no na no no na no no no 59.27 nm no odor lno sheen 03/01/02 690 551 33 14 77 5.1 no no na na na no no no 58.55 nm no odor lno sheen 05120102 2000 140 150 43 170 5.0 <0.50 <0.50 <0.50 <5.0 <2500 12000 1.3 <0.50 58.39 27.93 -30.46 no odor/no sheen 08130102 550 211,1 16 6.5 19 8.0 no no no no no na no no 61.45 -33.52 no odor!no sheen 12106/02 9800 2000 1300 290 1700 <10 no no no na no no no no 61.35 -33.42 odor/no sheen 03/07/03 4700 720 430 110 550 <25 no no no na no na no no 60.81 -32.88 odor/no sheen 06103/03 2600 460 280 67 350 4.6 <2.0 <2.0 <2.0 <20 <200 4000 <2.0 <2.0 59.73 •31.80 odor/no sheen 08/29/03 <250 8.8 5.8 <2.5 3.7 <25 no na no na no no no no 61.83 -33.90 no odor 1 no sheen 11/25/03 ns nsl ns ns ns ns ns ns ns ns ns ns ns ns 62.61 -34.68 not sampled 03/01/04 18000 20,1 18 <10 <10 <10 <10 <10 <10 <100 <1000 1300 <10 <10 61.37 25.84 -35.53 no odor!no sheen 06108/04 ns nsl ns ns ns ns ns ns ns ns ns ns ns ns 61.77 -35.93 not sampled 09/09/04 4300 9.1j 9.3 1.7 9.2 <10 na no na no no no no no 63.50 -37.66 no odor 1 no sheen 12!08104 ns ns,i ns ns ns ns ns ns ns ns ns ns ns ns 63.56 -37.72 not sampled 03/10/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 05/25/05 ns ns] ns ns ns ns ns ns ns ns ns ns ns ns 61.17 -35.33 not sampled 09102105 1200 781 110 26 150 <5.0 no no no no no no no no 64.97 -39.13 odor/no sheen 12/14/05 ns ns, ns ns ns ns ns ns ns ns ns ns ns ns 69.54 -43.70 not sampled ;i I 1' I. I� h i i 474Gmr05.x1s ' Project No.1474.46 I Page 14 of 18 HORIZON ENVUtONMENTAL ffic.