WILLMENG CONSTRUCTION, INC.

THE PURPOSE OF THIS MODIFICATION IS TO INCORPORATE CHANGES ASSOCIATED WITH THE FOLLOWING ITEMS REQUIRED TO COMPLETE THE NATIONAL SCIENCE FOUNDATION (NSF) ICE CORE FACILITY (ICF) PROJECT

MODIFICATION PS0004 INCORPORATE MULTIPLE PCOS THROUGHOUT PERFORMANCE FOR WORK WITHIN SCOPE OF THE CONTRACT. CLINS 0002 AND 0003 REMAIN UNCHANGED. CLIN 0001 PCO015 THROUGH 019 AND 021 THROUGH 023 ARE ADDED IN THE AMOUNT OF $53,550.49

THIS MODIFICATION PROVIDES FOR THE FOLLOWING PCO CHANGES: PCO#005-SHELVING CHANGES PCO #006 - MACHINE ROOM SIZE CHANGE PCO #009 - SOIL DISPOSAL AND PIPING SCOPE PCO #012 - BRANCH CIRCUITS AND PCO #013 - WOOD FLUSH DOOR CHANGE (ASI 2)

IN SUPPORT OF THE NEW ICE CORE FACILITY TO INCORPORATE PCO'S 002-004, 008, AND 010-011 ARE ADDED IN THE AMOUNT OF $120,333.08

INCORPORATE SOME SCOPE ADJUSTMENTS BASED ON REQUEST FOR INFORMATION (RFI) ITEMS AS FOLLOWS: #17 (IMP DEPRESSED FLOOR ASSEMBLY) RFI #21 (FREEZER DOOR HEADER) DATED FEBRUARY 19, 2024 AND RFI #20 (FREEZER SWING DOOR HEADER) DATED FEBRUARY 20, 2024

NATIONAL SCIENCE FOUNDATION NEW ICE CORE FACILITY LOCATED AT 1 DENVER FEDERAL CENTER, LAKEWOOD, CO 80225 BUILDING 810