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• Quarterly Report Page 2 <br /> Table 2 <br /> History of Hydraulic Gradients <br /> Date Direction Gradient <br /> 12-09-1998 Southwest 00011 <br /> 12-28-1999 South 00015 <br /> Discussion <br /> The analytical results of the groundwater samples collected during this quarter from wells <br /> MW-1 to MW4 indicate the presence of TPHG at a concentration of 65 9, 45 8, 17 8, <br /> and 42 5 ppm respectively Recorded before levels for MW-1 through MW-4 were 5 1, <br /> 4 7, 0 9, and 3 6 ppm respectively The chemical results for samples from wells MW-1, <br /> MW-2, and MW-4 for the 8260 oxygenates indicates concentrations of Methyl-Tert- <br /> Butylether at 210, 300, and 110 ppb respectively Methyl-Tert-Butylether was not <br /> present at MW-3 The chenucal analysis of domestic wells D-1 to D-4 for the 8260 <br /> oxygenates indicates no concentrations present except concentration of Methyl-Tert- <br /> Butylether at I lUg/L, in D-2 (well at 23565) The analytical results of the samples are <br /> summarized in Table 3 <br /> Table 3 <br /> Water Analyses for BTEX-TPH-G <br /> 23569 South Santa Fe Road <br /> Riverbank, California <br /> January 23, 1998 <br /> Ethel Total TPH-G <br /> Benzene(ugjj Toluene u Benzene u XyleneLuu <br /> PH8011051 <br /> RB-Domestic ND<3 ND<3 ND<3 ND<3 ND<50 <br /> PH8011052 <br /> Bonng No. B-1 36400 47100 3990 2000 238000 <br /> December 9, 1998 <br /> Ethel Total TPH-G <br /> Benzeneu Toluene(uBenzene(u") Xvlene u (ug ILL) <br /> MW-1 5120 7390 696 5020 65900 <br /> MW-2 4730 5470 561 3300 45800 <br /> MW-3 913 1530 165 1360 17800 <br /> MW-4 3560 4980 559 4070 42500 <br />