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Mr Don Rodgers Proposal P96-050 31 i May 14, 1996 Page 6 Soil Boring, Monitoring and Vapor Extraction Wells If additional soil borings are required, tasks procedures outlined in Subtask 2A will be implemented- Unit costs are provided in Tables 3 and are based on drilling soil borings to approximately 25 and 40 feet bgs If additional wells are required, procedures outlined in Subtask 2B will be implemented Unit costs are provided in Table 3 and are based on drilling soil borings to approximately 55 feet bgs If petroleum hydrocarbons are detected in soil bonngs at 25 feet bgs, based on field screening (PID readings and visual observations), one of the borings near the UST(s)and the boring at the north end of the property will be drilled to season low static groundwater (40 feet bgs) and will be converted to vapor extraction wells Soil Vapor Extraction Test If soil is impacted and wan-ant physical remediation, EMCON proposes to conduct an SVE test using the proposed wells to evaluate the feasibility of SVE for remediating petroleum hydrocarbon-tmpacted soil A 1-day SVE test will be performed on one of the vapor extraction wells The vapor extraction equipment used to perform the test will consist of a 460-cubic-inch VR3 internal combustion (IC) engine, instrumentation for measuring air flow, air velocity, air pressure, temperature, and volatile organic compound concentrations, and polyvinyl chlonde (PVC) piping, fittings, and well-head connections The IC engine, operating at approximately 2,000 revolutions per minute, is capable of generating vacuums of 18 inches of mercury (equivalent to 250 inches of water column) and flows of 250 cubic feet per minute, provided that extracted vapor contains approximatel% 18 percent oxygen by volume The SVE test will be performed for 5 hours on one of the vapor extraction wells to evaluate the radius of influence (ROI) for the well at various applied vacuums, and the low and vacuum characteristics of the extraction well The other wells will be used as observation wells dunng the SVE test. At the start of the test, the applied vacuum on the extraction well will be increased gradually to the maximum vacuum that allows the engine to operate efficiently EMCON will record the resulting extracted airflow rates at two to four different applied vacuums, to estimate well au-flow characteristics These data will aid in selecting a vapor extraction blower during the design phase After evaluating the well airflow charactenstics, the well will be subjected to 100 percent and 75 percent of the maximum applied vacuum for approximately 1 hour each to SAOK 1P96-050 J I-951dms 1