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neutral, but a few pockets of low pH remained. CTC was asked to prepare and provide at the <br /> site a tank with approximately 5% sodium hydroxide. <br /> 8. 5% sodium hydroxide was applied to the hot spots on December 1, 2001. The site was then <br /> left to allow the neutralization to proceed. <br /> 9. Sampling and testing on December 3, 2001, still showed a few hot spots. These were treated <br /> with 5% sodium hydroxide. The site was left to allow the neutralization to proceed. <br /> 10. Sampling and testing (litmus paper) on December 5, 2001 showed that all areas were <br /> essentially neutral. EI secured samples from approximately 8 inches deep at 5 locations along <br /> the tracks— <br /> Sample no. 1, 45 ft. east of the release. <br /> Sample no. 2, at the release. <br /> Sample no. 3,45 ft. west of the release. <br /> Sample no. 4, 21 ft. further west. <br /> Sample no. 5, 42 ft. further west. <br /> N All of these locations, except no. 1, were former hot spots. All samples were transported <br /> under chain of custody to Precision Enviro-Tech laboratory for analysis for pH. Analyses are <br /> given in Table 1 below. Certificates of analysis from the laboratory and a copy of the chain <br /> of custody are included in Appendix A. <br /> 11. EI returned to the site on December 14 and secured a composite sample from the spent lime <br /> rock pile. This was transported to Precision Enviro-Tech Laboratory for analysis of pH. This <br /> result is also listed in Table 1 below, and the Certificate of Analysis and copy of the chain of <br /> custody are included in Appendix A. <br /> 12. EI prepared this Report of Cleanup outlining all of the cleanup activities, which were <br /> completed. EI is confident that the acid release has been fully neutralized, and the site <br /> returned to acceptable condition. <br /> 13. The spent lime rock pile is essentially neutral and need not be treated as hazardous material. <br /> Environeering,Inc. Project No.01-011.25 4 <br />