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P <br />Messrs Trommer and LAW& <br />Preliminary Five -Year Review Letters 19 June 2008 <br />Various Sites Page 5 of 7 <br />2651 Airport Way, S. <br />• The CUF recommended that the EHD direct assessment of remedial <br />technologies and implement active remediation to achieve WQOs in a timely <br />manner. The EHD agrees with these recommendations but notes that a report of <br />findings for four cone penetration test (CPT) borings with membrane interface <br />probe (MIP) logs advanced last April is in preparation; upon receipt and review of <br />the report, the EHD will issue directives as appropriate. The EHD anticipates the <br />directives will be as recommended by the CUF. <br />3755 Munford Avenue <br />• The CUF recommended that the EHD direct the RP to implement groundwater <br />remediation to achieve WQOs in a timely manner; the EHD agrees with the <br />recommendation, noting that SVE is in progress and the consultant has <br />recommended addition of IAS and installation of additional SVE wells. The EHD <br />will be requesting a corrective action plan (CAP) to evaluate the most effective <br />technology to employ. <br />139 Center Street, S. <br />• The CUF recommended that the EHD direct the RP to assess remedial <br />technologies and the potential for vapor to enter nearby buildings; the EHD <br />agrees with these recommendations. <br />308 EI Dorado Street, S. <br />• The CUF recommended that the EHD direct assessment of remedial <br />technologies and implement active remediation to achieve WQOs in a timely <br />manner. The EHD agrees with these recommendations, a directive letter has <br />been sent. <br />244 Harding Way, W. <br />• The CUF recommended that the EHD direct the RP to define the extent of <br />groundwater contamination northeast of MW -1; the EHD agrees with this <br />recommendation and has approved additional monitoring wells east-northeast <br />and west of MW -1. Grab groundwater sample data from CPTs north of MW -1 <br />have been non -detect. <br />3250 Hammer Lane, W. <br />• The CUF recommended assessment of remedial technologies to achieve WQOs <br />more rapidly; the EHD agrees with this recommendation. The consultant has <br />recommended ozone injection; a report on the evaluation of ozone injection is <br />pending. <br />3400 Newton Road <br />• The CUF concurred with the EHD directive to install four additional groundwater <br />monitoring wells, but recommends that the appropriateness of conducting an <br />SVE test be evaluated. The EHD has approved a 48-hour groundwater extraction <br />test, but has no documentation of approving an SVE test. <br />5 -Year Review Comment Letter 061908.doc <br />