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Messrs Trommer and Ls-sgn <br /> 19 June 2008 <br /> Preliminary Five-Year Review Letters Page 5 of 7 <br /> Various Sites <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 i <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 /> I <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 />