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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.3641 1214 E.Hammer Lane,Stockton,California Depth to TOC GW Well TPH9benzene toluene ethylbenzene xylenes MTBE DIPS ETBE TAME TBA methanol ethanol OCA EDB GW Elevation Elevation /Number Date u 11 u A (u 11)( u q v tl (ug/1) u A u 11 u A u A u 11 ug/1)f u A u 11 feet feet msl feet msl Comments MW-7 12/16/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 23 <100 <5.0no no 100.02 screened 06/06100 <50 <0.50 <0.50 <0.50 <0.50 - <0.50 <0.50 <0.50 <0.50 7.9 <50 <5.0 '0.50 <0.50 42.04 57.98 clear interval 09/14/00 <50 <0.50 <0.50 <0.50 <0.50 2.7 <0.50 <0.50 <0.50 6.0 <50 <5.0 <0.50 <0.50 48.27 51.75 clear 35'-55' 12/12/00 <50 <0 50 <Uo <0.50 <0.50 1.9 no no no no na no no no 44.85 55.17 clear 03/19/01 <50 <a.sa <0.50 <0-50 <0.50 1.8 na no no na net na na na 42.04 57.98 clear 06/19/01 <50 <0.50 <0.50 <0.50 <0 50 1.0 no no no na no no na no 44.26 55.76 clear 09!27101 <50 <0.50 <0.50 <0.50 <0.50 2.0 no no na no no no no no 50.36 49.66 clear 12113101 <50 <0.50 <0.50 <0.50 <0.50 0.71 no no na no no no no no 47.21 52,81 clear 03!28102 <50 <0.60 <0.50 <0.50 <0.50 0.76 no no na na no no no no 43,82 1997. -23.85 clear 06/19102 <60 <0.50 <0.50 <0,50 <0.50 1.1 na na no na no no no no 45.34 -25.37 clear 09!16102 <50 <0.50 <0.50 m.50 <0.50 1.2 <0.50 <0.50 <0.50 <5.0 <50 6.2 <0.50 <0.50 5061 -30.64 cloudy 12!26!02 <50 <0.50 <0.50 <0.50 <0.50 072 no no na no no no no na 48.09 -28.12 cloudy 03/26/03 <50 <0.50 <0.50 <0.50 <0.50 1.6 as na no na no na no no 45.78 -25.81 clear 06/27103 <50 <0 50 <0.50 <0.50 <0.50 1.3 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 na 47,40 -27.43 clear 09/19103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry -- dry 12/30103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 50.25 -30.28 clear 03/26/04 <50 <0 50 <0.50 <0.50 <0.50 7.6 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 no 47.87 -27.90 clear 06117/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 51.73 -3176 not sampled 09109/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry dry dry 12116/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 53.91 -33.94 not sampled 03/03105 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <050 <0.50 <0.50 <5.0 61 <5.0 <0-50 na 50.12 -30.15 clear Mw-8 12/16199 810 6 3 1.2 <0.50 1.2 <0.50 <0.50 <0.50 <0.50 9.7 <100 66 no no 101.14 screened 06/06100 330 3.1 <050 <0.50 0.58 <0.50 <0.50 <0 50 <0.50 7 B <50 <5.0 <0.50 <0.50 43,42 57.72 clear interval 09/14100 170 4.3 <0.50 <0.50 <0.50 <0.50 <0.50 <0 50 <0.50 11 <50 <5.0 <0.50 <0.50 49.63 51.51 clear 35-55 12112100 <50 0.56 <0 50 <0.50 <0.50 <0.50 na no no no na no no no 45s6 55.58 clear 03119MI <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na no na no no no no 43.01 58.13 clear 06//4/01 <50 <0.50 <0.50 <0.50 <0,50 <0 50 no no no na no no no na 46.46 54.68 clear j 09/27/01 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na no na no na no na no 51.73 49.41 clear 12113/01 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no na no na no na no no 47.99 53.15 clear 03128!02 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no no no no no no no no 44.75 2107 -23.68 clear 06/19102 <50 <0.50 c0.50 <0.50 <0.50 <0.50 na na no no na na na na 47.11 -26.04 clear 09116102 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <050 <5.0 <50 <5.0 <0.50 <0.50 52.00 -30.93 cloudy 12126102 <50 <0.50 <0.50 <0.50 <0.50 <0.50 no na no na no no no no 48.91 -27.84 cloudy 03126103 <50 <0.50 <0.50 <0 50 <0.50 <0.50 na no no no no na no no 46.69 -25.62 clear 04/11/03 -- -- -- -- -- -- -• -- -- -- -- well destroyed . ..... .-+moi+v. s4tgmr_xls � Project hln,is.K,,,. Pagt 10 HORIZON ENVIRONNLr. ,...L INC.