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Geo(og&al Technics Inc Page 10 Groundwater Monitoring Report Project No 723 2 March 21,2005 ' 4 We recommend that interim remediation be considered before thisIn lume � ates any p further and the cost for cleanup continues to increase Interim remedial action can be ' initiated by installing a high vacuum dual phase extraction unit to address the on site contamination Extraction should be performed on the existing wells EW-1, VEW-1 & ' VEW-2 and a new extraction well set at a deeper depth The treatment system should include air stripping and carbon filtration of extracted groundwater to be discharged to City of Stockton public treatment works A work plan to accomplish this task has been ' sent to SJC/EHD for approval ' 4.0 LIMITATIONS This report 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 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 SIGNATURES AND CERTIFICATION ' This report was prepared by 014vo 1 �' ' Jose li Angulo Geologist 0 �O rz.l KABLAWOVVII ' 1 0. 523 ' Raynold I Kablanow II, Ph D California Professional Geologist#5234 CAL1�C Certified Hydrogeologist#442