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• 2.0 EXPERIMENTAL PROCEDURES
<br /> 2.1 Characterization of Soil and Groundwater
<br /> Site soil (MW-31 and 32) was received as 7 (seven) 6-inch long sleeves, which were
<br /> composited prior to testing Groundwater(MW-3) was also received in multiple
<br /> containers, but the containers were treated as identical
<br />' Untreated soil was analyzed for TPH-S, BTEX MTBE, TBA, acetone and Cr(VI
<br /> )
<br /> Untreated groundwater (GW) was analyzed for TPH-g, BTEX, MTBE, TBA, acetone,
<br /> alkalinity, anions (chloride, nitrate, sulfate), cations (Na, K, Mg, Ca), conductivity,
<br /> hexavalent chromium, metals (Al, Sb, As, Ba, Be, Cd, Cr, Co, Cu, Fe, Pb, Mn, Hg, Mo,
<br />' Ni, Se, Ag, Tl, W, V, and Zn), oxidation reduction potential (ORP), pH, and total
<br /> dissolved solids (TDS) TBA and acetone were measured because these may be
<br /> intermediates or by-products of MTBE and/or TPH-g oxidation
<br />' 2.2 Ozone Demand
<br />' The ozone demand of soil and groundwater was estimated using methods based on the
<br /> "Ozone Demand" tests described in Standard Methods for the Examination of Water and
<br /> Wastewater, 19'h Ed
<br />' The ozone demand of the soil was estimated by adding a 2 5g of field moist soil to 1 L of
<br /> ozone-saturated water, then measuring the concentration of ozone over time using the
<br /> indigo method A control in which no soil was added was also performed Each test was
<br /> conducted in duplicate, giving a total of six ozone consumption curves for soil The soil
<br /> ozone demand (SOD.,) was taken to be the difference in ozone consumption in the
<br /> presence and absence of site material It was calculated according to the equation
<br /> SODOz = {[03 Consumed],.,, — [03 Consumed]control} X VIM Eqn 5
<br /> where
<br /> SOD = soil oxidant demand in mg 03 consurned/g soil
<br /> [03 Consumed]contro, = change in 03 concentration in the absence of soil in mg/L
<br /> [03 Consumed],., = 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 /> The ozone demand of the groundwater was estimated by adding a 10-25 mL of GW to I L
<br /> I of ozone-saturated water, then measuring the residual ozone concentration over time
<br /> using the indigo method The GW ozone demand (GWODoz) was taken to be the
<br /> difference in ozone consumption in the presence and absence of GW It was calculated
<br /> according to the equation
<br /> GWODo,= {[03 Consumed]GW— [03 Consumed]....trolf x VtotNGW Eqn 6
<br /> PRIMA Environmental 3 Eval of Ozone
<br /> r January 27 2005 ENSR-Unocal 5098
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