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t ORO <br /> FUGRO WEST, INC. t.', iL, z,, <br /> P'f 1' 3 1050 melody Lane,suite iso <br /> Roseville,California 95678 <br /> Tel: (916)782-2110 <br /> FAX (916)786-7830 <br /> May 19, 1994 <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 445 N. San Joaquin Street <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> Subject: Former Shell Service Station (WIC No. 204-7524-1509) <br /> 141 N. EI Dorado Ave., Stockton, California <br /> Dear Ms. Meays: <br /> We are planning to install an air sparge system consisting of an air diffuser in each of the <br /> following wells at the above-mentioned site: MW-1 through MW-4, RWA, and RW-2. The <br /> system will include a small air compressor, pressure regulator, flow meters for each well, <br /> and a fine bubbler diffuser in each well. The system will also include a timer to allow the <br /> compressed air to be cycled on and off. A schematic of the system is presented in the <br /> enclosed figures. This system is intended to promote natural biological activity in the soils <br /> and groundwater by raising the dissolved oxygen (DO) content of the groundwater. The <br /> existing vapor extraction and groundwater pumping systems are expected to prevent off- <br /> site migration of hydrocarbons. <br /> System monitoring will consist of measuring DO levels in all the monitoring wells prior to <br /> starting the sparge system. At initial start-up, vacuum levels will be measured in all wells <br /> with the vapor extraction system and the sparge system in operation to ensure no vapor <br /> migration is occurring. DO levels will be added to the list of parameters measured <br /> (temperature, conductivity, and pH) while purging the wells for quality sampling. <br /> We anticipate installing the sparge system during the month of May 1994. Start-up of the <br /> sparge system will happen shortly after the sparge system is installed. The existing vapor <br /> extraction and groundwater pump and treat systems will continue to operate as usual. <br /> Groundwater samples will be collected and analyzed from all wells approximately 4 weeks <br /> after system start-up, to assess progress and ensure no adverse {glume migration. <br /> Groundwater remediation progress will continue to be monitored during quarterly sampling <br /> events (May, August, November, etc.). <br /> 9U73011 KLT U.S. operating companies in California, Louisiana, Missouri, and Texas <br /> International operating companies in Australia, Belgium, Brunei, Canada, Germany, Hong Kong, Indonesia, Japan, <br /> Malaysia,The Netherlands, Saudi Arabia, Singapore, United Kingdom, and United Arab Emirates. <br />