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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 3641 1210 E. Hammer Lane, Stockton, California ethyl- Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/1) (ug/1) u 11 (ug/1) (ug/1) u A u 11 u ll u 11 u 11 (ug/1) u 11 NO) (u11)( feel feet ms! feet msj Comments MW-9 12/10104 110 <0.50 39 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 52.79 19.00 -33.79 clear screened 3/3105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled interval 6/16105 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na <0.50 na 49.16 -30.16 clear 50'-70' 8/29105 <50 <0.50 <0.50 <0.50 <0.50 0.64 na na na na na na <0.50 na 54.19 -35.19 clear 12/29/05 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na <0.50 na 48.10 -29.10 clear MW-10 12/10/04 <50 <0.50 6.6 <0.50 <0.50 98 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 53.93 20.24 -33.69 clear screened 313105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled interval 6/16105 <50 <0.50 <0.50 <0.50 <0.50 62 na na na na na na <0.50 na 50.52 -30.28 clear 50'-70' 8129105 <50 <0.50 <0.50 <0.50 <0.50 82 na na na na na na <0.50 na 55.08 -34.84 clear 12/29/05 <50 <0.50 <0.50 <0.50 <0.50 24 na na na na na na <0.50 na 49.22 -28.98 clear MW-11 12/10/04 670 8.4 200 6,7 37 0.62 <0.50 <0.50 <0.50 <5.0 <50 16 <0.50 <0.50 54.82 19.58 -35.24 clear screened 313105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled interval 6116/05 <50 <0.50 12 <0.50 <0.50 <0.50 na na na na na na <0.50 na 43.68 -24.10 clear 130'-135' 8129105 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na <0.50 na 54.38 -34.80 clear 12!29105 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na <0.50 na 45.40 -25.82 clear MW-12 12/10/04 350 3.0 120 <0.50 0.86 16 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 54.62 19.61 -35.01 clear screened 313105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled interval 6116/05 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na <0.50 na 50.12 -30.51 clear 129'-134' 8/29105 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na <0.50 na 54.40 -34.79 clear 12/29/05 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na <0.50 na 48.34 -28.73 clear MW-13 12/10/04 <50 <0.50 <0.50 <0.50 <0.50 0.71 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 49.09 19.34 -29.75 clear screened 313105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled interval 6/16105 <50 <0.50 <0.50 <0.50 <0.50 0.62 na na na na na na <0.50 na 49.85 -30.51 clear 124'-129' 8129/05 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na <0.50 na 54.11 -34.77 clear 12/29/05 <50 <0.50 <0.50 <0.50 <0.50 <0.50 na na na na na na <0.50 na 48.16 -28.82 clear 641 qmr Projed No.1641.48 Page 8 of 13 HORIZON ENVIRONMNTAL INC.