SITE INFORMATION AND CORRESPONDENCE

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Messrs Trommer and Laadn 19 June 2008 Preliminary Five -Year Review Letters Page 4 of 7 Various Sites recommendation. A site conceptual model (SCM) has been received, upon its review the EHD will direct a feasibility study be conducted and reported. 1817 Fresno Avenue, S. The CUF concurs with the EHD that a limited investigation be conducted to confirm the extent of impacted groundwater toward the east; an investigation has been conducted and a report of findings is pending. The EHD will review the report after its submittal and will issue appropriate directives based on the findings. 4407 Waterloo Road, E. • CUF concurs with the EHD directive to implement active remediation (SVE) and recommends evaluation of in situ air sparging (IAS) as a means of achieving WQOs more rapidly. The EHD will direct assessment of groundwater remediation technologies. The SVE wells are installed and system operation is pending. 8200 Highway 99 CUF concurs with the EHD that the existing remediation system should continue in operatioin. A new extraction well is online that has dropped the water table enough to dry up extraction well EW -2. 2085 Fremont Street, E. The CUF recommended that the EHD direct assessment of remedial technologies and implement active remediation to achieve WQOs in a timely manner. The EHD agrees with these recommendations and has so directed the RP. A feasibility study has been received and EHD review is pending. 1207 Aurora Street The CUF recommends site closure consideration, the EHD believes the site may be ready for closure consideration toward the end of the year; the ozone injection system has recently been put back online, after a non -operational period, and includes some new deeper injection wells to address a lingering presence of 1,2 -DCA. 1022 Highway 99 The CUF recommends the EHD direct assessment of remedial technologies to address TPH-g, TPH-d, fuel oxygenates and implement remediation without delay. The EHD does not agree at this time; new data from recent borings has been acquired, which when received and reviewed may tie a significant portion of the contamination on the site to the above ground storage tank system; if so, the site will be referred to the CVRWQCB for regulatory oversight. 620 Charter Way, W. The CUF recommends the EHD direct the RP to monitor the recently installed monitoring wells for a full hydrologic cycle prior to assessing the need to conduct active remediation; the EHD agrees with this recommendation. 5 -Year Review Comment Letter 061908.doc