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Messrs Trommer and Lars%./ 14 April 2009 <br /> Annual Five-Year Review Update Letters Page 2 of 2 <br /> Various Sites <br /> 1876 Country Club Boulevard, Stockton, CA. <br /> The CUF recommended in Revised 5-Year Review Summary Report, dated 05 March <br /> 2009, that the EHD direct the RP to more aggressively remediate this site to achieve <br /> Water Quality Objectives more rapidly; to that end, the groundwater extraction rate has <br /> been increased from 2 gpm to 4 gpm. <br /> 110 Filbert Street, N., Stockton, CA. <br /> The CUF continued to recommend in Revised 5-Year Review Summary Report, dated <br /> 09 March 2009, that the EHD consider the site for closure. Groundwater in the core area <br /> continues to be impacted by numerous chemicals of concern at concentrations <br /> exceeding water quality objectives. Since early 2007, the groundwater gradient has <br /> shifted from southward to northeastward, a shift that has been consistent. Until this <br /> month there were no monitoring wells toward the northeast, at this time such wells have <br /> been installed, but not yet sampled. Intense odor emanating from samples collected <br /> during installation of the wells indicates a high potential for significant impact toward the <br /> northeast. The EHD will continue to provide close oversight for this site, but cannot <br /> support a recommendation for closure at this time and recommends that your agency <br /> does not issue a closure consideration recommendation at this time. <br /> 1717 EI Dorado Street, S., Stockton, CA. <br /> The CUF recommended in Revised 5-Year Review Summary Report, dated 09 March <br /> 2009, that the EHD direct the RP to re-implement the remediation system and consider a <br /> more aggressive technology to achieve Water Quality Objectives in the source area <br /> more rapidly. The EHD issued a directive by letter dated 18 March 2009 to submit a <br /> work plan in the context of a site conceptual model for additional delineation by 01 June <br /> 2009. <br /> Questions or comments should be directed to Michael J. Infurna, Jr. at (209) 468-3454. <br /> Sincerely, <br /> 9 �— <br /> Michael J. Infurn , REH Nuel Henderson, PG <br /> Senior Registered Envir nment I Engineering Geologist <br /> Health Specialist <br /> Annual 5-Year Review Comment Letter 041409.doc <br />