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1 Geological Teelurics fact. Page 11 Sinclair Trucking Project No.: 1030.2 November 1,2005 3.0 CONCLUSIONS AND RECOMMENDATIONS ' 0 The mass was larger than originally estimated in the 2003 Initial Site Conceptual Model. • Approximately 400 cubic yards of contaminated soil was removed from the site, which ' equates to approximately 1,861 pounds of soil. • Removing an additional 400 cubic yards of soil may have dramatically reduced ' contamination at the site by as much as an additional 70%. i As much as 2,645 pounds of TPH-G remains in the soil at the site, which is approximately 60% of the total mass of 4506 pounds of TPH-G estimated to be present in the soil. 0 GTI recommends continued quarterly groundwater monitoring for three more quarters. • If groundwater analyses show a decreasing or stabilized TPH-G concentrations over the ' next three quarters, GTI would recommend performing a risk analysis to evaluate the possible closure of the site. ' 4.0 LIMITATIONS This remedial action work plan was prepared in accordance with the generally accepted standard of care and practice in'effect at the time Services were rendered. It should be recognized that definition and evaluation of environmental conditions is an inexact science ' and that the state or practice of environmental geology/hydrology is changing and evolving and that standards existing at the present time may change as knowledge increases and the state of the practice continues to improve. Further, that differing subsurface soil characteristics can be experienced within a small distance and therefore cannot be known in ' an absolute sense. All conclusions and recommendations are based on the available data and information. ' The tasks proposed for this project will be reviewed and approved by the local regulatory agency for compliance with the law prior to work being performed. No warranty, expressed or implied, is made.