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San Joaquin County DIRECTOR <br /> Donna Heran,RENS <br /> �oAq`u I N7'.�o Environmental Health Department a381SrANTD00crnit <br /> 600 East Main Street <br /> Lauds co�,na,REHS <br /> .4 Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Sorgman,REHS <br /> Mike Huggins,REHS,RDI <br /> CC .. �P Website,www4gov org/ehd Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McCiellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesoo,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 />