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Messrs Trommer and LA&dn 19 June 2008 <br />Preliminary Five -Year Review Letters Page 6 of 7 <br />Various Sites <br />1419 Charter Way, E. <br />• The CUF concurred with the EHD directive to expand the ozone sparging system <br />to remediate impacted groundwater. <br />15 Grantline Road, E. <br />The CUF agreed with the EHD directive to define the extent of contamination <br />west of the site. <br />4100 Fremont Street, E. <br />The CUF recommended site closure consideration; the EHD does not agree at <br />this time. The site is approaching a point of closure consideration, but the <br />contaminant 1,2 -DCA has not been delineated toward the southwest. Recently <br />acquired grab groundwater sample data toward the southwest was generally <br />favorable, but 800 ppb TPH-g was detected at 65 to 75 feet bsg in P-15; soil gas <br />results were favorable. A report of findings is in preparation; after receipt and <br />review of the data analysis, the EHD will determine if closure consideration is <br />appropriate. <br />355 Enterprise <br />• The CUF recommended site closure consideration; the EHD agrees. <br />106 Second Avenue <br />The CUF has recommended site closure consideration; the EHD agrees with this <br />recommendation. The results of a recent soil gas investigation are in review, if <br />favorable, the site will likely be recommended for closure. <br />932 Highway 99, S. <br />The CUF has recommended site closure consideration, the EHD does not agree <br />at this time. The site groundwater data has been generally favorable, but the <br />EHD notes that confirmation borings advanced in 2003 encountered impacted <br />soil at 20 feet bsg; depth to water has recently been approximately 29 feet bsg. <br />The EHD is concerned with the potential for impact to groundwater under rising <br />groundwater elevation conditions. The EHD will direct additional confirmation <br />borings to evaluate the final result from the SVE operation from December 2000 <br />to January 2004, preparation of a contaminant mass estimate and a fate and <br />transport study, if appropriate. If favorable results are obtained, the EHD will <br />consider site closure. <br />308 Grant Street, N. <br />The CUF concurs with the RP proposal to install an SVE system and <br />recommends the EHD to direct assessment of the feasibility of a groundwater <br />remediation technology such as IAS. The EHD agrees with these <br />recommendations and will also direct completion of the plume delineation. <br />5 -Year Review Comment Letter 061908.doc <br />