11. PERIODIC MONITORING REPORT FOR VAPOR-SAMPLING ACTIVITIES AT MATERIAL DISPOSAL AREA L, SOLID WASTE MANAGEMENT UNIT 54-006, AT TECHNICAL AREA 54, THIRD QUARTER FISCAL YEAR 2011 Document(s) Author: Rice, William J ; Goldberg, Mitchell S ; Graham, Michael J ; Schappell, Bruce G ; Rael, George J ; et al. Number: ERID-206490 ; 2011