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3.3 Third'Batch The pump was restarted on September 10 but shut down numerous times between then and September 28. Only a few hundred gallons could be pumped before the pump shut down(Table 1). The cause of the problem was not determined;but the fact that it remained on without lifting water suggested that the flow was being interrupted,possibly by an air pocket. Turning the pump on and off several times usually restarted it,but this worked for only a short time before the pump would shut off again.It is possible that air pockets were created during the previous air sparging test in 2007 and that occasionally one of these pockets was sucked into the well, disrupting the flow. 4111 ? 2 The Grundfos®pump was replaced with a 1.66 Reclaimer pump on October 8. On October 12, storage tank#1 was full and the well was connected to tank#2. The water in tank#1 was then recycled through the carbon filters and a sample of the filtered water was collected for laboratory analysis. After another 7 days of pumping plagued by several malfunctions, only 1,200 gallons had been pumped to tank#2 (Table 1). Tank#1 was emptied, and the Reclaimer pump was removed and replaced with the original Grundfosg pump. 3.4 Fourth Batch The Grundfos®pump operated normally through October 24, at which point another 8,092 gallons had been removed. On October 26 a sample of the stored water was collected and then the stored water was recycled through the carbon filters. On October 27, a sample of the filtered water was collected and both samples were transported to the laboratory. The influent sample on October 26 showed definite improvement over the previous samples in,both the TPH-g concentration(Figure 2) and.in the concentration of volatile aromatic hydrocarbons (Total BTEX, Figure 3). The TPH-g concentration was approximately 75%of its value in the previous (September) sample. 3.5 Fifth Batch The fifth and final test run was started after the sample-results were received and the tanks were emptied on November 19. The pump operated very fitfully through December 14, shutting down nearly every day. By that time, Mr. Tom O'Neill of Valley Motors had been instructed on how to restart the system and he was performing this operation to save the cost of having Upgradient personnel travel to the site to turn the pump back on. As of December 14,only 3,333 additional gallons had been pumped,bringing the cumulative total to 32,625 gallons. Influent and filter samples were collected,the storage tanks were emptied, and the pump was removed on December 28. . i I 4