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e0 f0 waf Ieckrucs Inc • Page 7 oil Groundwater Investigation Report George's Service Project No 425 2 November 30, 1998 3.4 Waste Disposal On September 17, 1998, sixteen 55-gallon drums of soil were transported to Forward Landfill in Stockton Manifest documents are included in Appendix E On September 17, 1998, nine 55 gallon drums of drilling decon water and well purge water were transported to Industrial Service Oil Co Inc in Los Angles, CA Manifest documents are included in Appendix E 4.0 LI(M2 TATIONS This report was prepared in accordance with the accepted standards and practices of the field of environmental geology, groundwater hydrology and good business practices It should be recognized that definition and evaluation of environmental conditions is a difficult and inexact science Judgments leading to conclusions and recommendations are generally made with an incomplete knowledge of the site-specific conditions present The tasks proposed and completed during this project were reviewed and approved by the local regulatory agency for compliance with the law No warranty, expressed or implied, is made 5.0 CONCLUSIONS AND RECOMMENDATIONS Based on our interpretation of the data collected over the course of this subsurface investigation we have reached several conclusions These conclusions are based on the premise that the data we considered, although incomplete, are representative of actual site conditions We acknowledge that there may be undiscovered conditions, which would upon their consideration, change our interpretation and thus our conclusions Our recommendations are based on our knowledge of site conditions and the state and limitations of subsurface investigative technology 5.1 Conclusions Geological Technics Inc , taking into consideration the data obtained during previous site investigation work and the June 29 through July 1, 1998 soil and groundwater investigations, makes the following conclusions Subsurface Investigation The following conclusions are made based on our professional interpretation of the field observations made during the completion of the soil borings, well installation, and soil and groundwater sample test data 1 The majority of soil contamination is limited to the upper 10 to 15 feet a relatively close distance from the former USTs on the north side of the building 2 Although soil samples obtained from MW-4 and MW-5 were non-detect, field observations of soil condition (i e , screening by OVM) and groundwater sample test results suggest that the soil and groundwater have been impacted by petroleum hydrocarbons in these areas We feel that the most likely source for the contamination found in MW-4 and MW-5 is the pump island and associated piping