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TABLE 1 <br /> GROUNDWATER MONITORING DATA <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road,Stockton,California <br /> ethyl Depth t0 TOC GW <br /> Well TPHg benzene toluene benzene xylenes MTBE RIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation <br /> Number Date (uglL) (ugIL) (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) (ugll) (ug/L) (ug/L) (ug/L) (ug/L) (ug1L) (ug1L) (feel) (feet sea level) (feet sea level) Comments <br /> MW 7 11112/98 ns ns ns ns ns ns as ns ns ns ns ns ns ns 2055 wellhead survey <br /> screened 1260198 340 48 1 74 22 <5 0 na na na na na na na na 4543 2488 no odor!no sheen <br /> interval 03126!99 550 94 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 23 <50 <50 na na 4133 2078 no odor!no sheen <br /> 41 66 06102199 230 <0 50 <0 50 <0 50 <0 50 1 1 -050 <p 50 <0 50 28 <50 <5 0 270 <0 50 4076 2021 no odor/no sheen <br /> 08131/99 120 <0 50 <0 50 <0 50 <0 50 12 <0 50 <0 50 <0 50 13 <50 <50 160 <0 50 4556 2501 no comment <br /> 12/09/99 130 <0 50 <0 5o <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <50 98 <0 50 4714 2659 <br /> 02/21/00 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 84 <50 <50 96 <0 50 4556 2501 no odor 1 no sheen <br /> 05/18/00 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 68 <50 <50 na na 4078 2023 no odor 1 no sheen <br /> 09!26100 68 <0 50 c0 50 <0 50 <0 50 <5 0 na na na na na na na na 4889 -2834 no odor 1 no sheen <br /> 12/20/00 87 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4751 2696 no odor 1 no sheen <br /> 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4637 2582 no odor I no sheen <br /> 0192MI <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 33 <0 50 4903 2848 no odors no sheen <br /> 09/05101 68 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 54 D6 3351 no odor!no sheen <br /> 11130/01 97 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5401 -3346 no odor!no sheen <br /> MW 8 11112198 ns ns ns ns ns ns its ns ns as ns ns ns ns 2038 wellhead survey <br /> screened 12130/98 68 12 076 <0 50 081 <50 ne na na na na na na na 4538 24 98 na odor 1 no sheen <br /> interval 03/26/99 58 <0 50 <0 50 <0 50 <0 50 51 <0 50 <0 50 <0 50 <50 <60 <10 na ne 4108 <br /> 2070 no odor I no sheen <br />� 41 66 06/02/99 c50 c0 50 <0 50 <0 50 c0 50 29 <p 50 <p 50 <0 50 <50 <50 <50 86 c0 50 4052 2014 no odor 1 no sheen <br /> 08131/99 <50 <0 50 <0 50 <0 50 <0 50 16 <0 50 <0 50 <0 50 <5 0 <50 <50 54 <0 50 i 4544 25 06 no comment <br /> 12109!99 <50 <0 50 <0 50 <0 50 050 14 <0 50 <0 50 <0 50 <5 0 <50 <50 60 <0 50 1 at -2663 <br /> 02121100 210 <O 50 <0 50 <0 50 <0 50 20 <0 50 <0 50 < <br /> 051f 8100 53 < 050 <50 <50 <50 69 <0 50 45 38 <br /> 2500 no odor!no sheen <br /> 0 50 <0 50 <0 50 <0 50 1 8 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 40 54 2016 no odor 1 no sheen <br /> 09126100 68 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 49 13 -2875 no odor 1 no sheen <br /> 12120100 <50 <0 5o o 51 <0 50 <0 50 <50 ne na na nana na na na 4752 2714 no odor I no sheen <br /> 03127/01 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 46 13 2575 no odor/no sheen <br /> 0612601 <50 <0 50 <0 50 <0 50 <0 5o 16 <br /> <0 50 <0 50 <0 50 <5 0 <50 <5 0 57 <o , <br /> 48 76 28 38 no odor!no sheen <br /> 09105/01 1800 200 25 65 250 <50 na na na na na na na na 5384 -3346 no odor!no sheen <br /> 11130D01 370 65 <0 50 60 083 10 na na na na na na na na 5386 -3348 no odor!no sheen <br /> e19ym,a1,� <br /> 141944 Page 4 of 7 HORIZON ENVIRONMENTAL INC <br />