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i Pressure measurements at each well and the barometric pressure at <br /> that time Pressure measurements are collected from each SVE well <br /> during quarterly O&M site visits <br /> ii Vapor flow rate at each well and the vapor flow rate at the blower <br /> inlet Vapor flow rate data is collected from each SVE well during <br /> quarterly O&M site visits SVE system influent and effluent data is <br /> collected on a monthly basis <br /> iii Vapor temperature at each well, and at the blower inlet and outlet <br /> Vapor temperatures for each SVE well and at the blower inlet need to be <br /> included in quarterly O&M site visits Influent and effluent vapor <br /> temperature data is currently collected on a monthly basis <br /> iv Relative humidity of the extracted gas (if activated carbon is being <br /> used to treat off-gas) The relative humidity of the soil vapor was <br /> previously unnecessary because extracted gas was treated by a thermal <br /> oxidizer Proposed system enhancements include bypassing the thermal <br /> oxidizer and using two 1,000 pound gas activated carbon (GAC) units to <br /> treat the extracted gas Once the GAC units are installed, the relative <br /> humidity of the extracted gas will be collected on a monthly basis <br /> v Volume of liquid in the air-water separator Already included in <br /> weekly system O&M scope of work <br /> vi Blower amperage, run-time, and on/off cycles The blower amperage <br /> is measured periodically using an amperage meter Run-time and on/off <br /> cycles are recorded on data logger and tracked to measure system <br /> performance for the SVE system With the exception of scheduled <br /> maintenance, the SVE system operates continuously <br /> vii Vapor contaminant concentrations at each well and monitoring <br /> point Concentrations of VOCs in vapor samples are field screened with <br /> a photoionization detector (PID) at each extraction wellhead prior to the <br /> collection of soil vapor samples Soil vapor samples are collected in <br /> summa canisters on a quarterly basis and analyzed by a laboratory using <br /> TO-3 Methods <br /> d Are measurements made with adequate frequency (every 3-12 months in a <br /> single round) to determine if capture or air throughput are affected by <br /> changes in extraction rate, soil moisture content, or groundwater levels? <br /> Are measurements made on a seasonal basis if seasonal fluctuations in <br /> parameters such as soil moisture content or water table level are <br /> expected? Vapor samples are collected from SVE wells quarterly <br /> Concentrations of dissolved petroleum hydrocarbons in groundwater do not <br /> appear to be affected by seasonal fluctuations of the groundwater table <br /> elevation <br /> e Are flows, vacuum levels, and concentrations measured in each extraction <br /> well? Are these parameters monitored with the same frequency as the <br /> monitoring points? Flow, pressure and VOC concentrations are monitored <br />