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Messrs Trommer and La , an 19 June 2008 <br /> I 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 />