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I! <br /> ! ) 404 WEST FREMONT STREET <br /> WKA No. 1628.09 <br /> August 31 , 2001 <br /> Page 6 <br /> On April 8, 1992, Wallace w Kuhl & Associates (WKA) collected one water sample from well <br /> MWI . A sheen of product was observed on the water prior to sampling. Test results revealed a <br /> -I TPHg concentration of 20,000 µg/1 and elevated BTEX concentrations. <br /> I i During December 1992 WKA installed and sampled three monitoring wells (MW2, MW3 , and <br /> MW4) at the locations shown on Platen. Results of the investigation indicated that gasoline and <br /> BTEX contamination in ground water is concentrated to the north and west of the former fuel <br /> 'i tank, based on analytical results of water samples from well MW4 and product observed on the <br /> water surface in well MWL Trace concentrations of gasoline and BTEX were detected in the <br /> water sample collected from well MW2; no detectable concentrations of gasoline and only trace <br /> toluene concentrations were observed in the sample collected from well MW3 . Neither gasoline <br /> I nor BTEX were detected in any of the soil samples collected during well installation. <br /> - � On December 1 , 1993, wells MW2, MW3 and MW4 were sampled. Well MW1 was not <br /> - sampled due to free product observed on the water. Test results revealed gasoline contamination <br /> in water samples from wells MW3 and MW4; no detectable concentrations of gasoline were <br /> 1 <br /> revealed in the water sample collected from well MW2. <br /> -1 WKA installed monitoring wells MW5 and MW6 northwest and west, respectively, in April <br /> 1994. Soils encountered during installation of the wells did not exhibit evidence of petroleum <br /> hydrocarbon contamination. Laboratory analyses did not detect petroleum hydrocarbons in any <br /> L of the six soil samples submitted for analysis. Initially, groundwater samples from both MW5 <br /> and MW6 showed relatively low concentrations of petroleum hydrocarbons. Subsequent <br /> samples, however, have shown increasing concentrations in MW5 and no detectable <br /> concentrations in MW6. <br /> ' J <br /> Beginning with a sampling event on December 21 , 1994, off-site well SMW2, located just south <br /> 1 of the site, was incorporated into the groundwater-monitoring program for the site. Petroleum <br /> ` hydrocarbons have not been detected in this well.. <br /> I-) <br /> WdA LACE _ KOHL <br />