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PRIMA Environmental tmoise/2 <br /> August 25,2004 <br /> b. <br /> SCOPE OF WORK <br /> Task 1 Ozone Demand <br /> The ozone demand of soil will be estimated using a method based on the"Ozone <br /> Demand"test described in Standard Methods for the Examination of Water and <br /> Wastewater, 19`h Ed. <br /> ` A small amount of soil will be added to ozone-saturated water, then the concentration of <br /> ozone will be measured oover time using the indigo method. A control in which no soil <br /> is added will also be performed. Each test will be conducted in duplicate and one to two <br /> soil amounts will be used. The soil ozone demand (SODoz) is taken to be the difference <br /> in ozone consumption in the presence and absence of site material. It was calculated <br /> according to the equation <br /> SODoz = {[03 Consumed]soil—[03 Consumed]�o„trol] x V/M Eqn. 2 <br /> where <br /> SOD = soil oxidant demand in mg 03 consumed/g soil <br /> [03 Consumed]eornol =change in 03 concentration in the absence of soil in mg/L <br /> [03 Consumed]soil =change in 03 concentration in the presence of soil in mg/L <br /> V=volume of ozonated water in L <br /> M= mass of soil in g <br /> Task 2. Confirmation of Contaminant Removal <br /> A preliminary test will be conducted in which a mixture of site soil and groundwater <br /> containing H2O2 will be sparged with ozone to estimate the longevity of the H2O2. The <br /> presence of H2O2will be monitored using test strips. <br /> To confirm that COCs are removed and estimate the amount of removal due to <br /> destruction versus volatilization, three batch tests will be conducted. Soil and GW will <br /> be placed in a closed reactor fitted with a gas dispersion tube and vent for off-gases. One <br /> reactor will also include an inlet for addition of H2O2. Ozone will be sparged into two of <br /> the reactors, including the one to which H2O2is added. The third reactor will be sparged <br /> with nitrogen. Off-gases will be collected in Tedlar bags for 60 minutes in order to <br /> determine whether volatilization is occurring. (Gases will be collected from 0-30 <br /> minutes and from 30-60 minutes. Note that it is not possible to collect all of the off-gases <br /> due to the large volume expected.) The off-gases will then be analyzed for CDCs. At the <br /> end of the test, the aqueous phases will be analyzed for COCs. Untreated soil and water <br /> ` will also be analyzed. <br /> Total number of analyses, Task 2: <br /> • CDCs in water: <br /> o 4 std TAT <br /> L <br /> PRIMA Environmental 2 General Ozone Protocols <br /> February 2,2004 Applied Process Technology, Inc. <br /> I✓ <br />