SITE INFORMATION AND CORRESPONDENCE_1992

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1. CAPTURE ZONE ANALYSIS Capture was evaluated for both the North and South Balloon Area Groundwater Treatment Systems. The average daily potentiometric data for the quarter was determined by averaging a minimum of one data point per month for each well. Plume extents (5 ppb) were drawn using the data from same quarter as potentiometric data. A-Zone Capture of Plume 1 , A-Zone, in the South Balloon Area is almost complete. The northern edge of Plume 1 and Plume 3 are not being captured by South Balloon System. The Central Area System will include extraction well in this area (South End of Runway). The quantity of water being pumped from A-Zone has been going down due to the drop in water level. Extraction well A-4 was shut down early October 1992. Based on 3-D Modeling, its not necessary. Capture of Plume 7 and 8, A-Zone, in the North Balloon area is almost complete. New wells NA-8, NA-9, NB-5, NC-2R, and NC-3R are operating. If additional pumping is necessitated in the A-Zone, all wells except NA-1 have more capacity. B-Zone Capture of Plum 1 , B-Zone, in the South Balloon Area is near complete. The northern edge of Plume 1 and Plume 3 will be captured by Central Area extraction well in this area (South End of Runway). Extraction well B-3 was shut down early October 1992. Based on 3-D Modeling, its not necessary. Capture of Plume 7 and 8, B-Zone, in the North Balloon area is nearly complete. New extraction well NB-5 went into operation during the month of April . C-Zone Capture of Plume 1, C-Zone, in the South Balloon Area was almost complete. Extraction well C-3 was repaired in April. Continual pumping of these three wells will produce a better capture zone next quarter. Capture of Plume 7 and 8, C-Zone, in the North Balloon Area was not complete based on water level data available. New wells NC-2R and NC-3R went into operation during the first quarter. There is noticeable difference. when compared to last quarter' s map. Larger pumps could be added to wells NB-1 , NB-2, and NB-3 which were drilled to 125 feet, 120 feet, and 121 feet, respectively. At least one C-level monitoring well will be added on the north eastern side of plume. DDRW believes better capture is being achieved than indicated.