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a a a ENGINEERING, INC. <br /> RCE#27011 Lic.#537901 <br /> OCT 15 2003 <br /> October 9, 2003 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Ms. Lori Duncan <br /> Senior Environmental Health Specialist <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202-2708 <br /> SUBJECT: GROUNDWATER TREATMENT SYSTEM <br /> DESIGN WORKPLAN - EXTENSION REQUEST <br /> JAMAR SERVICE <br /> 4075 EAST MAIN STREET <br /> STOCKTON, CALIFORNIA <br /> Dear Ms. Duncan: <br /> GHH Engineering (GHH) is currently providing JAMAR Oil Distribution(JAMAR) professional <br /> engineering services to assist them with environmental issues pertaining to their site located at <br /> 4075 East Main Street, Stockton, California. On behalf of JAMAR, GHH prepared the Second <br /> Quarter 2003 Groundwater Monitoring Report and Additional Assessment Report for submittal <br /> to the San Joaquin County Environmental Health Department (SJC/EHD). In this report, GHH <br /> recommended installing an interim groundwater pump and treat system at the JAMAR site. In <br /> response to the GHH report, SJC/EHD requested that JAMAR submit a workplan for an interim <br /> pump and treat groundwater extraction system, due no later than October 17, 2003. <br /> GHH has evaluated several ex situ groundwater treatment options for the site, including air <br /> stripping, granular activated carbon (GAC), coconut shell carbon, synthetic resins, and advanced <br /> oxidation. These treatment approaches were considered both individually and in combinations. <br /> The relatively high concentrations of methyl-tert-butyl-ether(MTBE) and tertiary butyl alcohol <br /> (TBA) present in JAMAR site groundwater present a challenge and limit the treatment options for <br /> this site. Air stripping and GAC have not proven to be effective methods for removing elevated <br /> concentrations of MTBE and TBA from groundwater, particularly if the groundwater is also <br /> impacted by benzene, toluene, ethylbenzenes, and xylenes (BTEX), as it is at this site. While <br /> coconut shell carbon units present an option for MTBE removal, this treatment approach is <br /> reportedly less effective for TBA removal. Although selected synthetic resins and ex situ <br /> advanced oxidation technologies can effectively reduce MTBE and TBA concentrations in <br /> groundwater, the costs associated with these options are prohibitively high. <br /> 11960 Heritage Oak Place • Suite 2B •Auburn, CA. 95603 (530)886-3100 (800)877-1739 fax: (530)886-3108 <br />