As per visiting the site, we found that the contractor repaired 4 units of artificial stone in bay 2 No:(S8F-007, S7-009, S6-007, S6B-003) by non-approved materials and also method non-approved, because the contractor used grinder machine to adjust the edges of units mentioned above, which led to the appearance of defects in these units. Therefore, these units are considered rejected and the contractor has to change it by another similar units without defects.