Independent engineering report and certification for closure of building 419 equipment including the size reduction unit {ampersand} solidification unit at Lawrence Livermore National Laboratory

Closure of Building 419 Equipment Including the Size Reduction Unit and Solidification Unit December 31, 1996 Closure activities began in June, 1995 and equipment closure activities were completed in December, 1996. This report determines final closure for B419 Equipment, and was prepared and submitted to LLNL in the final stage of the work. CE performed the Independent Engineering services at the request of Ms Dixie Finley of LLNL, as part of the B419 Closure Plan requirement. B419 was constructed by the Navy in the 1940s and used by the Navy for various purposes related to airplane maintenance. In later years, the building was used by a health chemistry program as an assay laboratory. Since 1975, the building has been used by LLNL for equipment decontamination and hazardous and mixed waste treatment activities known as size reduction and solidification. These activities which were covered by the LLNL Part B Permit Application, were discontinued in late 1989 because B419 could not meet the seismic guidelines of the Uniform Building Code (UBC). B419 is a 7, 860 ft square structure consisting of three areas. The middle area has a second floor (attic area); the other two areas (north side and south side) have one floor. The size reduction activities occurred in the south side of the building (room 124), while the solidification activities occurred in the north side (rooms 155 and 167). Documentation for closure of B419 was submitted on September 23, 1994 to DTSC. The documentation consisted of a letter, together with the Closure Plan, Sa1017 Sampling and Analysis Plan, and Health and Safety Plan. A revision to this documentation was sent to DTSC on November 14, 1996, reflecting a two-phase closure for B419 as follows: RCRA Equipment Closure phase to be completed and certified by December 31, 1996. RCRA Structural Closure phase to be extended to September, 1997. This current report certifies the final B419 RCRA Equipment Closure including the Size Reduction Unit and the Solidification Unit