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_ __ _ <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> lee < Director304 East Weber Avenue, Third Floor Carl Eorgman, R.E.H.S. <br /> Al Olsen, R.E.H.S. Stockton, California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> r . �� . �c • Program ManagerDouglas W. Wilson, R.E H.S . <br /> 9 � � FORN Telephone : (209) 468-3420 Margaret La orio, R.E.H.S . <br /> Program <br /> ram Manager <br /> Laurie Cotulla, R.E.H.S. Fax: (209) 464-0138 Robert McC ellon, R.E.H.S. <br /> Website: www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S . <br /> RODGER LISTON <br /> DARPETRO INC USA SERVICE STATION JAN 0 6 2006 <br /> 3450 EL CAMINO <br /> CERES CA 95307 <br /> RE : DARPETRO, INC Site Code : 1060 <br /> 749 E CHARTER WAY <br /> STOCKTON, CA 95202 <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Feasibility Study (FS ), dated 14 December 2005, prepared and <br /> submitted on your behalf by California Geophysical Group (CGG). CGG prepared <br /> the FS in response to EHD's directive conveyed by letter dated 27 September <br /> 2005 to submit a feasibility study for groundwater remediation . <br /> CGG compared : <br /> • In-situ ozone injection utilizing a C-Sparge system , <br /> • An apparently ex-situ pump and treat system utilizing a PulseOX unit to <br /> treat extracted groundwater, and <br /> • Natural attenuation . <br /> CGG selected in-situ ozone injection as the most cost effective approach to <br /> groundwater remediation for the site , primarily on an installation and operational <br /> cost basis. While EHD believes that ozone injection or groundwater extraction <br /> may be an applicable remedial method appropriate for the site, the justification <br /> put forward by CGG is based solely on costs to install and operate. Cost is <br /> certainly an important consideration for selecting a particular remediation <br /> method , but a technical justification for a particular method is also needed. <br /> Please provide the technical justification for the preferred remediation method to <br /> EHD by 15 February 2006 . <br /> Technical factors often considered include the properties of the contaminants, <br /> mass and distribution of the contaminants , the geological and hydrogeological <br /> framework in which the contaminants exist and in which the remediation system <br /> must operate , site use and facilities , likely contaminant response to the <br /> remediation system and environmental factors that may interfere with or enhance <br /> the remediation system considered , and estimated time of operation . <br />