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e (, ( _ ) <br /> Messrs Trommer and Lon "r` 96 June 2008 <br /> Preliminary Five-Year Review Letters Page 2 of 7 <br /> Various Sites <br /> wells. The EHD is awaiting the groundwater extraction test report to comment 'on <br /> pump and treat; the absorbent appears to be for free product and has not been <br /> approved. <br /> 2500 Lodi Avenue, W. <br /> • CUF recommended site;',closure consideration. A DPE test was recently <br /> conducted on MW-3; -a report of findings is anticipated in the near future with a <br /> closure report addressing vapor intrusion potential and comparison to Region Il <br /> ESLs. <br /> 345 Yosemite Street, N <br /> • CUF recommended site closure consideration. The EHD does not agree with this <br /> recommendation at this time for the following reasons. The site has two UARs <br /> and separate site. codes (503414 and 2216), but have been worked under one <br /> CUF Claim (#12858). The western former underground storage tank (UST) site is <br /> nearly ready for closure.consideration, but recent review shows that the vertical <br /> extent of impacted groundwater has not been demonstrated. Also, a sand unit <br /> that is a potential contaminant migration pathway was not sampled toward the <br /> northwest.. The EHD will direct that these data be acquired. The EHD also <br /> believes some. attempt `should be . made to reduce the contaminant <br /> concentrations more rapidly, perhaps some batch groundwater extraction. <br /> • The eastern former UST:;site,(case #503414) is not fully delineated laterally or <br /> vertically. Additional monitoring wells to. complete the lateral and vertical <br /> assessment of the east6.r6, UST is required. Following receipt of the report of <br /> monitoring well installations; assuming favorable analytical results, and sufficient <br /> quarterly monitoring of'tlie�.new wells, this case may then be ready for closure <br /> consideration. As with. the other case on the site, the EHD also believes some <br /> attempt should be made,to'reduce the contaminant concentrations more rapidly, <br /> perhaps some batch groundwater extraction. The RP will be directed to evaluate <br /> the potential benefit from some remediation for both cases. <br /> 15406 Tracy Blvd. <br /> • CUF recommended. consideration for site closure; the EHD does not agree with <br /> this recommendation at this-time. Vertical delineation of impacted groundwater is. <br /> not complete; the onsite domestic well, screened: between 76 and 96 feet bsg, is <br /> approximately 100 feet from impacted monitoring well MW-4. A work plan will be <br /> submitted in the. near future to advance two geoprobe borings downgradient of <br /> MW-4 for lateral and vertical delineation and to perform a pumping test on MW-4; <br /> the EHD, in consultation with the CVRWQCB,- believes this work should be, <br /> completed before closure consideration. <br /> 757 Eleventh Street <br /> • CUF recommended evaluation of remedial technologies and potential for vapor. <br /> intrusion. The EHD agrees;with these recommendations, but notes that there <br /> were two UST system's with releases approximately 300 feet apart. The down- <br /> gradient and cross gradient extents of the dissolved plume centered on former <br /> 5-Year Review Comment Letter 061608.d& <br /> t <br />