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1 <br /> KWAFT <br />-� analyzed for TPH as gasoline and BTE&X in accordance with approved EPA methods. <br /> These samples will be important in correlating PID readings and determining clean-up <br /> levels. <br /> A log book will be stored at the site for all monitoring and maintenance activities. This book <br /> ' will document all pertinent data for the project including engine running time, vapor flow, <br /> PID readings, engine coolant levels, blower pressure levels and supplemental fuel <br /> ' consumption (if possible). <br /> 3.7 Estimated Clean-up Time <br /> ' Using information in the PAR, we estimate that approximately 200 gallons of petroleum <br /> hydrocarbons (gasoline) remains in the soil at the site. Based upon a very conservative <br /> ' recovery rate of 4 kg/day, we estimate a clean-up time of approximately 6 months (the <br /> theoretical limits of a vapor extraction system is up to 890 kg/day in ideal conditions). <br /> After six months or when the efficiency of the unit has declined, an evaluation of the <br /> remediation system will be made. The evaluation will be made using PID data, soil samples, <br /> vapor samples and supplemental fuel costs. A recommendation will be made for either site <br /> ' closure (soil) or continuation with remediation. If remediation is continued, additional <br /> recommendations for either continuation with the VACLEEN system or an alternate system <br /> will be made. <br /> 3.8 Confirmation Borings <br /> ' When the projected six-month clean-up period has been completed, or efficiency of the unit <br /> has declined, one or two soil borings will be drilled within the projected contamination <br /> plume to determine if significant soil contamination remains. The approximate locations of <br /> ' the borings are depicted on Figure 6. <br /> The borings will be drilled with a truck-mounted, hollow stem auger drill rig. The borings <br />' will be drilled to groundwater(approximately 60 feet). Soil samples will be collected at five- <br /> foot intervals using a split-spoon sampler. The sampler will be loaded with three clean, 2 by <br /> 60-inch brass sleeves. Samples will be screened in the field using a PID. <br />' Selected samples will be transported under chain-of custody to a state-certified laboratory <br /> for analysis. The samples will be analyzed for TPH as gasoline and BTE&X in accordance <br /> with approved EPA methods. These samples will be used for site-closure determination. <br /> If remediation is continued beyond the projected six-month period, at Ieast one additional <br />' soil boring will be drilled after each six months of remediation system operation. <br /> 1 <br /> Ck.&&t A.&Sett:.,tae. 8p <br /> AM MP/7-9".47 <br />