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PRIMA Environmental, Inc. charms/3 of 7 <br /> Confidential Decernber 9,2007 <br /> Secor—Circle K rtp <br /> SCOPE OF WORK <br /> Task 1. Soil and Groundwater Preparation and Characterization <br /> Prior to testing, soil will be homogenized and particles greater than about 4 mesh will be <br /> removed. Homogenized soil will be analyzed for <br /> - GRO <br /> - BTEX <br /> - MTBE <br /> - TBA <br /> - TBF <br /> - Cr(VI) <br /> - Total Cr <br /> Groundwater received in multiple containers will be composited then analyzed for <br /> - GRO <br /> - BTEX <br /> - MTBE <br /> - TBA <br /> - TBF <br /> - Bromate <br /> - Bromide <br /> - Cr(VI) <br /> - Total Cr <br /> - pH <br /> - ORP <br /> For this task only, GRO, BTEX, MTBE and TBA will be analyzed ruing 72 hrs <br /> turnaround time(TAT)so that treatability testing can be completed in a timely manner. <br /> The results will be communicated to SECOR If requested,one or more parameters may <br /> be spiked into groundwater prior to further testing. If groundwater is spiked, a sample of <br /> spiked groundwater will also be analyzed for GRO, BTEX, MTBE, and TBA. <br /> Task 2. Ozone Demand <br /> The ozone demand of soil and groundwater will be estimated by adding a small amount <br /> of either material to ozone-saturated water, then measuring the concentration of ozone <br /> over time using the indigo method(SW 4500-03). A control in which no soil or <br /> groundwater is added will also be performed. Each test will be conducted in duplicate. <br /> The ozone demand is taken to be the difference in ozone consumption in the presence and <br /> absence of site material. <br />