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Messrs Trommer and Loon <br /> K Preliminary Five-Year Review Letters 21 July 2008 <br /> Various Sites , Page 3 of 3 <br /> issued a directive to prepare a feasibility Study over a year ago; the EHD belie <br /> ves <br /> the site would be amenable to excavation with removal of impacted groundwater <br /> seeping into the excavation. <br /> 2420 Turner Road <br /> • The CUF agreed with the EHD that active'remedi�ation should begin as soon as <br /> feasible to achieve WQOs in a timely manner. The. EHD agrees with this <br /> recommendation. Eleven monitoring wells (two deep, nine shallow) have been <br /> installed on the site; recently five vapor extraction wells and seven IAS wells <br /> have been installed and plumbed to an enclosure; a permit has been issued by <br /> li the air board; at this point a remediation unit must be installed and a power <br /> connection established to initiate remediation. <br /> 466 Moffat Boulevard <br /> • .,The CUF has recommended that the site be considered for closure. The EHD <br /> believes the plume is delineated vertically and laterally, but covers an area <br /> approximately 100 feet by 100 feet and the plume has total petroleum <br /> hydrocarbons quantified as gasoline (TPHg) at concentrations that varies into the I <br /> low tens of thousands of parts per billion. The EHD believes the TPHg f <br /> concentrations are too high to obtain a concurrence on a site closure <br /> recommendation; therefore the EHD believes some remediation of impacted <br /> groundwater is required. To that end, the EHD has directed preparation of a <br /> remedial action plan; the RP has proposed dual-phase extraction, which the EHD <br /> is evaluating. <br /> Questions or comments should be directed to the appropriate caseworker. <br /> Sincerely, <br /> /(tel I <br /> Harlin Knoll, REHS Lori Duncan, REHS I <br /> Senior Registered Environmental Senior Registered Environmental <br /> Health Specialist Health Specialist <br /> Nuel Henderson, PG Margaret g�®rio, REH <br /> Engineering Geologist Program Coordinator <br /> 5-Year Review Comment Letter 072108.doc <br /> t <br />