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San Joaquin County DIRECTOR <br /> oPo,uiN c <br /> _gs-- OG Environmental Health Department Donna Heran, REHS <br /> ASSISTANT DIRECTOR <br /> c 2� 600 East Main Street Laurie Cotulla, REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> -- Carl Borgman, REHS <br /> Website: Www.Sjgov.org/ehd Mike Huggins, REHS, RDI <br /> _-_ Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464-0138 Jeff Carruesco, REHS, RDI <br /> 16 June 2008 Kasey Foley, REHS <br /> Messrs. Robert Trommer, CHG, and Kirk Larson, PG <br /> State Water Resources Control Board <br /> Division of Financial Assistance <br /> 1001 1 Street <br /> Sacramento CA 95814 <br /> Subject: Preliminary Five-Year Review Letters <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed numerous preliminary five-year review letters each with your request to convey <br /> the EHD's agreement or disagreement with the site-specific recommendations. The EHD <br /> comments for a selection of those sites are provided herein, sites not noted in this letter <br /> will be addressed in the near future. Due to the high volume of preliminary five-year <br /> review letters and the ongoing workload and commitments of the EHD, the following <br /> comments pertain only to the recommendations; other information in the five-year letters <br /> that is incorrect or incomplete is noted only insofar as that information directly affects the <br /> recommendations. <br /> 1901 EI Dorado Street, S. <br /> • The State Water Resources Control Board Cleanup Fund Five Year Review <br /> Committee (CUF) has recommended that the EHD direct the Responsible Party <br /> (RP) to implement soil vapor extraction (SVE) and assess the efficacy of insitu air <br /> sparging (IAS) to achieve Water Quality Objectives (WOO) more rapidly. <br /> • The EHD evaluated the potential for proposed IAS in 2005 and had determined <br /> there may be a problem with a clay interval occurring at and below the water <br /> table minimizing the potential for recovery of sparged air and stripped vapor and <br /> maximizing the potential to cause lateral migration of impacted groundwater in <br /> the underlying coarse-grained unit. The consultant has since recommended dual <br /> phase extraction (DPE), for which the EHD is directing a pilot test work plan to be <br /> prepared. <br /> 425 Larch Road, W. <br /> • CUF recommended the EHD direct the RP to assess remedial groundwater <br /> technologies and implement groundwater remediation. The EHD agrees with this <br /> recommendation but adds that delineation of the downgradient extent of the <br /> impacted groundwater must still be completed. The EHD notes that remedial <br /> technologies have been proposed — pump and treat and use of absorbents in the <br /> 5-Year Review Comment Letter 061608.doc <br />