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i �� MWR 'NR x.,y_. -^r`" f Project A152 16 January 1992 The system influent was adjusted to 2800 ppm as measured by the field FID. However, the subsequent analysis of the influent air bag indicated an influent concentration of 1200 ppm. The system vacuum remained high at 6.5" Hg with the system operating at over 400 scfm. Moist soil conditions began to limit the magnitude of the vacuum at which the system waw operating. The system deactivated itself on 20 November due to a full water accumulator barrel. The system was visited and revived on .25 November. Additional water storage barrels were delivered to the site during this time. On 27 Noven&r, the wells were monitored and the system was adjusted. The system was adjusted to a point where the pump motor was operating near its maximum amperage rating. There was a slight decrease in both the vacuum and the vapor loading of the system influent. Under the moist soil conditions, the motor has a higher electrical load requirement. Only miAimum TVH concentrations could be obtained for several of the extraction points. Low oxygen and high concentrations at these wells resulted in either a direct extinguishing of the flame detector, or suspect low readings. Several of these wells were left open (i.e. MW-1) because prior monitorings indicated a history of very high concentrations. A special dilution kit has been placed on order with the manufacturer which will allow for operation of the FID under these conditions. In the interim, the TLV meter and in one case, direct sampling of the wells with an air bag has been used. The system ran continuously from 27 November to 4 December. On 4 December, the system deactivated itself due to a full water accumulator. The site was visited by our field technician shortly after the system went down. The technician emptied the water, and attempted to restart the system. The system would not restart due to insufficient propane. The system was restarted on 9 December and then fully monitored on 10 December. Several extraction points were closed at that time due to low concentrations or the presence of water. The system influent was maximized to 3150 as measured by the field FID. The calculated extraction rate, based or the laboratory analysis of the air bag, was in excess of 400 pounds per day. The system did not operate between 13 and 18 December, again due to a lack of propane. The system was restarted on 18 December. Thepropane site more Frequently, -2-