SITE INFORMATION AND CORRESPONDENCE

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Sharpe -4- 19 September 1984 Subsequent to the meeting the State again reviewed the Phase I and II analytical data . Although only low levels of 602 analytes were detected not all mon- itoring wells were sampled and analyzed using Method 602 at any one time . Because of this the State believes that EPA Method 602 should be included in all future sample analyses until sufficient data is collected for a complete assessment. Sharpe will prepare an Off-post Monitoring Plan and submit it for State review by 1 October 1984 . III. Plume Definiyion Wells A. South Bslloon Area Sharpe has made an estimate of the distance con- tamination has moved along a plume centerline, which was presumably drawn based on past ground water gradier. t data . Using this estimate Sharpe has selecte:d four locations for placement of monitoring wells t.o define the off-post plume. Different depth wells wrill be drilled at each location . Sharpe believes that the proposed wells are appropriately located_ for initial plume definition ; but further wells mazy be necessary. Board -taff pointed out that no estimate of the lateral or vertical extent of pollutants had been made making :tet difficult to accurately locate wells. Staff believe t--s that all the existing analytical data should be used to predict the plume ' s present location in three diimensions. Sharpe r-equested the State to supply them with such an analysis, but responded that the well locations may be immater_i.al due to the fact that Mr. Lewis, the leasee of the _land west of the Depot, has denied permission to dril_1 any wells on his property (which is leased from Souathern Pacific Land Company) . The Statte will perform a plume analysis and contact Mr. Lewtis . The State will then propose areas in which to dri1L plume definition wells.