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Ira June 2008 <br /> Page 3 of T <br /> Messrs Trommer and L son <br /> Preliminary Five•Year Review Letters <br /> Various Sites Jelineated, nor has the <br /> US acted area has <br /> e <br /> not been <br /> ed on the former UST #2 area9radient extent of the <br /> gro <br /> p <br /> 2132 Mariposa Road, Eotential for vapor <br /> CUF recommended evaluation of remedial technologies and p <br /> intrusion; the o D agrees <br /> with The chis rec consultant hasdrequested delay in the evaluationion and has dire'ted <br /> of remedial g Ian for which is in <br /> pending the results of additional site investigation, a work p <br /> preparation. <br /> 3430 EI Dorado Street, S. <br /> o The CUF has recommended continued operation of the SVEMAS systems with <br /> periodic reevaluation; the EHD agrees with this recommendation. <br /> 1301 Kettleman Road, W. <br /> The CUF has recommended evaluation of air or ozone sparging to achieve water <br /> quality objectives more quickly; the EHD agrees that remediation is appropriate <br /> for this site and has approved a pump and treat system. The consultant has <br /> installed two extraction wells and recently obtained the discharge permit; the <br /> system is expected to be in operation in August of this year. <br /> 4444 Pershing Avenue, N. <br /> The CUF has recommended assessment of the current remediation technology <br /> however there has been <br /> no effectiveness and amending as necessary; <br /> difficult to <br /> recent <br /> active remediation on this site. Contaminants on the site have been d <br /> address as the bulk of the sorbed mass is in fine-grained soil in the saturated <br /> zone. A work plan has been approved to install a deep monitoring well, screened <br /> between 50 and 55 feet bsg, and additional soil borings. The site has been <br /> evaluated for vapor intrusion potential and has been reported as having a low <br /> potential. <br /> 4004 EI Dorado Street, S. <br /> The CUF has recommended reevaluation of the treatment system and evaluation <br /> lerate <br /> EHDprocs. The <br /> e agreesal andrInear MW-I to wASissue a diectivecletter totaddesshe dtheloMW 1 area as <br /> recommended. <br /> 1766 Monte Diablo Avenue <br /> The CUF has recommended reassessment the efficacy of the current <br /> lementato tion of additional technologies <br /> groundwater remediation system and imp <br /> as appropriate. The EHD agrees with the recommendation and has recently <br /> approved a proposal to evaluate DPE and has directed submittal of a work plan <br /> to conduct the pilot test. <br /> 5-Year Review Comment Letter 061608.doe <br /> -Year Review Comment Letter 061608.doc <br />