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The flow system will first be operated without the addition of <br /> either nutrients or hydrogen peroxide for several days to be <br /> certain that all equipment is operating properly, Initially <br /> F only nutrients will be added to the flow system. Hydrogen <br /> 1: <br /> Et peroxide addition will begin later. Hydrogen peroxide has been <br /> shown to be least toxic to the microorganisms and most beneficial <br /> after the initial microbial stimulation has occurred (12). Thus . <br /> there is a delay in the addition of the oxygen source. Different <br /> inert tracers (su(h as chlorides or iodides) may be added to each <br /> injection well so that complete sweeping of the contaminated zone <br /> F 1 . can be demonstrated by monitoring the withdrawn flow strear. 3 <br /> l pg <br /> i _ <br />� <br /> SEEN <br /> - 10"Emw 21-IM!, <br /> r• <br /> -35- <br /> � <br /> r <br /> r <br />� Ik <br /> J <br /> 4 <br />