Addendum 1.pdf

Addendum 1

Project DKFX 13-1010 Repair MWD Area. Bldg. 649

Joint Base Charleston – Air Base South Carolina

07 October 2022

1. Drawings

a. All applicable drawings:

i. Replace “Vaporer Barrier”, “Vapor Retarder” and/or

“Capillary Barrier Layer” with “Spray Applied Vapor Intrusion Barrier System”

2. Specifications:

a. Specification Section 03 30 00 Cast In Place Concrete i.Paragraph 1.3 Submittals:

Replace “Vapor Retarder” with “Spray Applied Vapor Intrusion Barrier System” ii.Paragraph 2.2.6 Vapor Retarder

Replace this paragraph in its entirety with the following:

2.2.6 Liquid Applied Vapor Intrusion System

Spray applied vapor intrusion barrier system shall be Liquid Boot, Geoseal 60 or equivalent system. The minimum system shall include drainage layer, passive ventilation system, base fabric system, spray applied membrane and protection layer. The minimum dry thickness of the system shall be 59 mils. The system’s manufacturer shall recommend applications for methane, CO2, low levels of volatile organic compounds (BTEX, chlorinated solvents, etc.).

iii.Paragraph 3.4.2 Vapor Retarder

Replace this paragraph in its entirety with the following:

3.4.2 Spray Applied Vapor Intrusion Barrier System

Install spray applied vapor intrusion barrier system, including but not limited to drainage layer(s), passive venting system(s), base layer(s), spray applied membrane layer(s), protection layer(s) and/or other components and layers shall be installed in strict accordance the manufacturer’s published instructions.