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i <br /> may be difficult to obtain access to install additional upgradient monitoring wells, Time proposes that <br /> l efforts be focused on interim remediation rather than further investigation. <br /> Time believes that the installation and operation of an interim remediation system, such as a vapor <br /> extraction system, may mitigate the need for additional investigation in the upgradient direction, as well <br /> as prevent additional groundwater impacts. During the operation of the interim remediation system, <br /> groundwater monitoring would be continued to confirm that additional contaminant migration is not <br /> occurring, to monitor remediation efforts, and to assist in identifying source areas which may require the <br /> implementation of additional remediation technologies. <br /> Upon the PHSIEHD's concurrence that additional investigative efforts will not be required at this time, <br /> Time will secure consultant proposals for remediation pilot testing; design, installation, and operation of <br /> an appropriate interim remediation system; and continuation of the quarterly groundwater monitoring <br /> program. If you have any questions regarding these matters, please do not hesitate to contact me at <br /> (206) 286-4495. <br /> Sincerely, <br /> Time O i ll C o. <br /> �/ <br /> Anastasia E. Duarte-Wilkinson <br /> Environmental Toxicologist <br /> cc: Ms. Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> octIOM4049123,doc <br /> 3 <br />