Amendments to DPWH Standard Specification for Item 706 - Concrete, Clay, Plastic and Fiber Pipe. Category: Department OrderSub Category: construction-materialsSeries: 2015No: 57File: DO_057_S2015.pdfDate: Monday, April 6, 2015Tags: Amendments Standard Specification Item 706 Concrete Clay Plastic Fiber Pipe materials BRS 057Bureaus and Services: Bureau of Research and Standards Read more about Amendments to DPWH Standard Specification for Item 706 - Concrete, Clay, Plastic and Fiber Pipe.