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ENVIR0N"MENTAL HEALTH r)EPARTMENT <br /> SAN JOAQUIN COUNTY <br /> t y Donna K. Heran, R.E.H.S. Unit Supervisors <br /> uQii. i< Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> • P • Program Manager Douglas W. Wilson, R.E.H.S. <br /> Ii R6 Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ .teff Carruesco, R.E.H.S. <br /> DAVID A ROSSO APR 0 5 2005 <br /> STOCKTON CENTER SITE AUTHORITY <br /> 401 GOLDEN SHORE, SECOND FLOOR <br /> LONG BEACH CA 90802 4210 <br /> RE: California State University Stanislaus <br /> 1252 N. Stanislaus Street RO 0700 <br /> Stockton, CA 95205 <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed your work plans Workplan for Ozone Bench Scale Test and Workplan for <br /> Enhanced Bioremediation Bench Test, both dated 27 December 2005, and prepared by <br /> Condor Earth Technologies, Inc. (Condor). EHD has also exchanged e-mails with <br /> Condor regarding the proposed scope of work in the work plans and discussed the work <br /> plans with the Central Valley Regional Water Control Board (CVRWQCB). <br /> The work plans contain proposals to collect soil and/or groundwater samples during <br /> installation of some previously approved monitoring wells to utilize for bench scale <br /> testing to assess suitability of ozone injection and/or enhanced bioremediation to <br /> address contaminants related to the unauthorized release from the underground <br /> storage tank (UST) system formerly on your site. Among other chemical or biological <br /> analyses proposed for the samples are total organic carbon (TOC), total inorganic <br /> carbon (TIC), solid oxygen demand (SOxD), biological oxygen demand (BOD), <br /> dissolved oxygen (DO), oxygen reduction potential (ORP), general minerals and iron <br /> content. Lately, EHD has been recommending a number of these analyses during the <br /> site assessment phase to have site-specific data available to evaluate the potential <br /> feasibility for in-situ oxidation or monitored natural attenuation (MNA). <br /> As it is likely that some remediation of your site will be necessary prior to site closure <br /> consideration, EHD approves the bench scale tests as a component of the site <br /> characterization; however approval for the bench-scale tests from the CVRWQCB is <br /> also necessary to address their concerns regarding potential degradation of <br /> groundwater and/or aquifer characteristics. Also please note that at this time this is not <br /> an approval to utilize in-situ oxidation with either ozone or other oxidizing agent or for <br /> MNA or enhanced bioremediation to remediate impacted soil or groundwater on your <br /> site. Such approval is given after completion of the site characterization and a feasibility <br /> study or corrective action plan comparing the potential effectiveness of several remedial <br /> alternatives for a site has been approved — neitherstep being completed at this time. <br />