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1117 Lone Palm Avenue,Suite 201 <br /> (YVATC <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> Fax:209-579-2225 <br /> ASSOCIATES INC. <br /> Sample Analyses <br /> Two soil samples will be collected from the borehole of each sparge well within the saturated zone at <br /> approximately 29 feet bgs and 34 feet bgs for geotechnical analyses. Each soil sample will be collected <br /> in brass sleeves or acetate sleeves, whichever method is best suited to capture an undisturbed sample. <br /> Each sample will be analyzed for total organic carbon using the Walkley-Black method and particle size <br /> analysis using ASTM Method D422M and AST Method D4464M.The data obtained from these analyses <br /> will be useful regarding remedial design considerations. <br /> Baseline Sampling and Monitoring <br /> The two soil samples collected from 29 and 34 feet bgs will also be analyzed for total chromium by EPA <br /> Method 6020 and hexavalent chromium by EPA Method 7199. Prior to start of the pilot test, baseline <br /> measurements of static water level, dissolved-phase fuel hydrocarbon concentrations, dissolved total <br /> chromium and hexavalent chromium, bromate, pH, temperature, dissolved oxygen (DO), and oxidation- <br /> reduction potential (ORP)will be collected. These monitoring parameters will be measured periodically <br /> for the duration of the pilot testing. Groundwater samples will be analyzed weekly during the test period <br /> for hexavalent chromium and bromate. The CRWQCB will be notified immediately of changes above <br /> baseline concentrations with respect to hexavalent chromium and bromate. As deemed appropriate,other <br /> parameters may also be monitored. <br /> The groundwater samples collected from selected nearby monitoring wells prior to the start and at the end <br /> of the pilot testing will be submitted under chain-of-custody procedures to a State-certified laboratory. <br /> The samples will be analyzed for gasoline range organics (GRO) and diesel range organics (DRO) <br /> utilizing EPA Method 801513; and benzene, toluene, ethylbenzene, and xylenes (BTEX), MTBE, ethyl <br /> tertiary butyl ether(ETRE), di-isopropyl ether(RIPE),tertiary amyl ether(TAME),tertiary butyl alcohol <br /> (TBA), 1,2-DCA,and 1,2-dibromoethane(EDB)utilizing EPA Method 8260B.The groundwater samples <br /> will also be analyzed for total chromium by EPA 6020, hexavalent chromium by EPA Method 7199, and <br /> bromate by EPA Method 300. <br /> Ozone Sparge Pilot Testing <br /> A mobile ozone generator will be connected to the ozone sparging wells to inject ozone into the saturated <br /> zone. Ozone will be injected into each sparging well for approximately 15 to 20 minutes per hour over a <br /> period of four weeks at a rate of approximately 2 to 3 cubic feet per minute. This "micro-sparge" <br /> approach will provide information to evaluate the effectiveness of an ozone sparge system (low airflow <br /> and low pressure). The duration and rate of ozone injection can be adjusted downward or upward as <br /> desired. The sparging wells will alternately be used as observation wells when not being actively utilized <br /> as the ozone injection well. Monitoring parameters will be periodically measured in nearby monitoring <br /> wells two to three times a week during the test. <br /> REPORT PREPARATION <br /> Upon completion of the field activities, a report will be prepared describing the field activities. The <br /> report will summarize the feasibility testing activity, field and analytical results. Additionally,the report <br /> Pilo\ g Workplan—1&L Market ATC Associates Inc. <br /> 5:...\288489\589\Reports ATC Project No.54.28589.e8O1 <br /> 6 <br />