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UNIVERSITY OF CALIFORNIA <br /> LAWRENCE LIVERMORE NATIONAL LABORATORY <br /> SITE 300, GROUND WATER CLEANUP STATUS -2- 20 December 1989 <br /> six months. Therefore, it is unclear if any interim remedial measures will take <br /> place. <br /> 2. Environmental Test Area (ETA) <br /> The ETA includes the Building 834 complex, Building 830 area, and Building 833 <br /> area. Most of the pollution in the ETA occurs in Building 834 complex where TCE <br /> has polluted a perched aquifer. LLNL has been conducting a pilot study on ground <br /> water treatment technologies for about two years. The effort has been plagued to <br /> some extent by mechanical problems with the treatment technology, including algal <br /> growth in the aeration tank, TCE adsorbiny/absorbing into piastic tank walls, an <br /> oily compound in the extracted ground water that interferes with the airstripping, <br /> and excessive water condensation in the monitoring instrument lines. <br /> In the ERWP, LLNL proposed to submit an RI/FS for the Building 834 complex by 1 <br /> January. 1990 and to begin RA by 1 April 1990. <br /> LLNL continues to monitor TCE found near Buildings 830 and 833. At Building 830, <br /> ground water contains low levels of TCE, while at Building 833, TCE has been found <br /> at low levels in the soil vapor. <br /> LLNL proposes to submit the RI/FS for Building 833 by 1 April 1991 and to begin <br /> RA by 1 May 1991. No further reports are proposed for Building 830 at this time. <br /> 3. Pit 7 Complex <br /> TCE and tritium escaped from Pits 3 and 5 in the Pit 7 complex which is comprised <br /> of Pits 3, 4, 5, and 7. Pollution is confined to a shallow aquifer atop a ridge. <br /> LLNL submitted the RI%FS on 17 November 1989 and proposes to begin RA on 1 April <br /> 1990. LLNL. also proposed to cap Pit 7 and install runoff diversion ditches to <br /> prevent inundation and infiltration of the landfill . <br /> 4. Building 850/Fast Firing Area <br /> A second tritium plume emanates from Building 850 (a short distance from Pit 7) <br /> and extends to the East Firing Area. LLNL continues to monitor the pollution via <br /> numerous monitoring wells. <br /> LLNL proposes to submit the RI by 1 May 1990, the FS by I January 1991 , and to <br /> begin RA by 1 April 1991. <br /> 5. Pit 6 <br /> TCE has leaked into the shallow aquifer, but our evaluation of the Solid Waste <br /> Assessment Test report determined that _ hazardous _materials at hazardous <br /> concentrations had not leaked. The plume has remained almost stationary for <br /> several quarters. <br />