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Y Messrs.Trommer and L~.lin 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 />