"[We] certify that Rivadillo-Flores Construction and Supply [Casanova Waterproofing and Supply] has satisfactorily completed the waterproofing works of Mactan Shangri-la Hotel & Resort, Inc.'s Aquarium , Plant Boxes, Service Duct Slab, General Top Slab, Machine Room Top Slab and Wash Basin using Thoroseal Waterproofing."