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Project A152 21 May 1992 <br /> 17 April 1992 Monitoring: <br /> The system had been down since 3:00 p.m. the day before (16 April) and <br /> was purged prior to monitoring to minimize rebound. The ground gate was <br /> fully open. The influent was again increased by decreasing ambient <br /> dilution to the limit of the exit temperature. <br /> At the conclusion of this monitoring, the dilution valve opening was <br /> reduced and 8 of the system's 23 extraction points were left open. The <br /> system vacuum was raised to 4.8" Hg and the system was extracting <br /> approximately 213 pounds of hydrocarbons per day. <br /> 22 April 1992 Monitoring: <br /> On this interim monitoring, only the extraction points were monitored. <br /> However the system influent was increased by increasing the catalyst <br /> exotherm by 1000F. <br /> A new dilution system for the field OVA was tested on this date. The <br /> dilution system should assist in obtaining TVH readings from wells with <br /> high concentrations and low oxygen. Samples were obtained from VP-2, <br /> MW-1 and MW-17 for comparison of the field OVA readings with the <br /> laboratory Gas Chromatograh results. <br /> The results are presented below and show good agreement between the field <br /> and laboratory values. <br /> VP-2 MU-1 MH-17 <br /> OVA 3,360 ppm 15,120 ppm 8,400 ppm <br /> TPH 3,638 ppm 12,088 ppm 9,656 ppm <br /> CH4 43 ppm 46 ppm 62 ppm <br /> The 02 and CO2 readings were taken during this visit. Again, the <br /> dilution valve opening was reduced from the initial setting. At the <br /> conclusion of this monitoring, 11 of the system's 23 extraction points <br /> were left open. The system vacuum was 4.0" Hg. <br /> 6 May 1992 Monitoring: <br /> A complete system monitoring was undertaken on this date. (lith the <br /> dilution monitoring system , it was determined that MW-10 had a TVH <br /> concentration of 36,000 ppm; a level well beyond the previous 10,000 ppm <br /> previous full scale range of the OVA. At the conclusion of this <br /> monitoring, 13 of the system's 23 extraction points were left open. The <br /> system vacuum was 3.0" Hg and the system was extracting approximately 203 <br /> pounds of hydrocarbons per day. <br /> -2- <br />