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. TA0 1 0 <br /> GROUNDWATER MONITORING DATA <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road, Stockton, California <br /> ethyl- Depth to TOC GW <br /> Well TPHg benzene toluene benzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation <br /> Number Date (uq/Q (ug/L) (ug/L) {uglL} (uglL) (ug/L) (ug1L) (u 1L) (ug/L) (ug/L) (ug1L) (ug/Q (ugIL) (ug/L) (feet) (feet sea ievei) (feet sea level) Comments <br /> MW-5 03131/98 75 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na nano no no 4846 2043 2803 <br /> screened 06110/98 <50 <0 50 <0 50 <0 50 <0 50 <50 na no no no no no no no 4272 2229 <br /> interval 09108/98 <50 1 2 091 <0 50 094 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 no no 4692 2649 no odor/no sheen <br /> 48 71 11112t98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2043w <br /> survey <br /> 12130M 110 067 <0 50 <0 50 <0 50 <5 0 no no no na no no na no 4545 2502 no odor 1 no sheen <br /> 03126199 67 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <20 na na 41 26 2083 no odor I no sheen <br /> 06102!99 <50 <0 50 <o 5o <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 71 <0 50 4061 2018 no odor I no sheen <br /> 08/31199 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 16 <0 50 4549 2506 no Comment <br /> 12109!99 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 200 <0 50 4704 -2661 <br /> 02/21/00 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 190 <0 50 4547 2504 no odor I no sheen <br /> 05/18/00 <100 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 12 <100 <10 no no 4071 2028 no odor 1 no sheen <br /> 09/26/00 64 <0 50 <0 50 <0 50 <0 50 <5 0 no no na na no na no no 4882 2839 no odor 1 no sheen <br /> 12/20/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na no no na no na no no 4741 2698 no odor I no sheen <br /> 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na no na no no no nono 46 19 2576 no odor 1 no sheen <br /> 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 16 <0 50 4876 26 33 no odor 1 no sheen <br /> 09/05/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na na na na na na na 5379 3336 no odor)no sheen <br /> 11130/01 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no no no na no 5388 3345 no odor 1 no sheen <br /> 02127/02 <50 <0 50 062 <0 50 <0 50 c5 0 na na no no no no na no 5062 3009 no odor I no sheen <br /> 05116102 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 14 <0 50 5062 2199 2863 no odor 1 no sheen <br /> 09112102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no no na no na 5857 3658 no odor 1 no sheen <br /> 12104102 <50 <0 5o <0 50 <0 50 <0 50 <5 0 na no no no no no no no 57 11 3512 no odor 1 no sheen <br /> 02/17103 57 <0 50 <0 50 <0 50 <0 50 <0 50 no no no no na no no no 5403 -3204 no odor I no screen <br /> 06102/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 1050 <0 50 <0 50 <5 0 <50 <5 0 30 <0 50 5317 -31 18 no odor 1 no sheen <br /> 09/18103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled <br /> 11/24/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5833 3634 not sampled <br /> 02123/04 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 c50 <5 0 22 <0 50 5484 3285 no odor 1 no sheen <br /> 06/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5504 3305 not sampled <br /> 09107/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6153 -3954 not sampled <br /> 12/10104 nsns ns ns ns ns ns ns ns ns ns ns ns ns 5930 3731 not sampled <br /> 03108/05 <50 <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 5574 3375 no odor/no sheen <br /> 419grnrp5 ds <br /> ProleO No 141948 Page 5 of 13 HORIZON ENVIRONMENTAL INc <br />