SAPMT has reviewed the subject submittal dated May 12, 2014 and has the following comments:
1.	Detailed structural analysis are required to prove that filling with dune sand will not affect the crash rating of the pre-cast wall.
2.	More details about packing the excavated space with dune sand, flooding durations with water and steps for quality control are required.
3.	According to SAES-A-114, other fill materials may be used with the approval of the Supervisor, Civil Engineering Unit of Consulting Services Department (CSD).
4.	IC shall not deviate from the backfill type used during the crash test.
5.	Consider consolidating all issues related to the precast wall in one single submittal.
Should you have any questions, please contact Sohail Moughal, Project Engineer at Tel No. +966 2 422-4570.
