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' On December 12, 1989, Kennedy/Jenks/Chilton collected thirteen additional surface soil samples <br /> in the vicinity of the two areas identified during the preliminary investigation conducted in April <br /> ' and May, 1989. The analytical results from these samples indicated that pesticides, including <br /> DDT, were present at concentrations between 62.5 ppb and 130,000 ppb. <br /> ' On April 10-13, 1990, surface soil containing pesticide concentrations exceeding 1,000 ppb was <br /> ' excavated and confirmation samples were collected under the direction of <br /> Kennedy/Jenks/Chilton. The results of the confirmation samples indicated that one sample <br /> ' contained DDT at a concentration above 1,700 ppb. Health-risk calculations indicated that the <br /> remaining soil did not pose an unacceptable health risk. The excavations were backfilled with <br /> clean imported fill material on May 10, 1990. <br /> ' On April 19, 1990, Kennedy/Jenks/Chilton removed the 1,000-gallon diesel UST from the site <br /> and collected confirmation soil samples. Petroleum hydrocarbons were not detected in the <br /> confirmation soil samples and the excavation was backfilled. In addition the three trailers and <br /> ' their contents were disposed of on April 13 and April 24, 1990. <br /> ' On May 31, 1990, groundwater monitoring well (MW-5)was installed to collect additional soil <br /> and groundwater data downgradient of the former tank location. Typical petroleum <br /> hydrocarbons were not detected in soil samples collected during the installation of MW-5. <br /> Petroleum naptha was detected in one soil sample. <br /> ' Groundwater samples were collected from all five monitoring wells on June 5, 1990. Petroleum <br /> hydrocarbons were not detected in the groundwater samples collected from MW-2 through <br /> MW-5. Petroleum hydrocarbons were detected in the groundwater sample collected from <br /> ' MW-1. Detailed analytical results from this sampling event are provided in Tables 2 and 3. <br /> Continued groundwater monitoring at the site has been conducted and the results are also <br /> presented in Table 4. <br /> ' 3 <br />