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Standard Manhole, Catch Basin, Vault, and Trench Certification As a NPCA certified plant, we certify that all materials manufactured by Granite Precasting & Concrete, Inc. comply with the following and are of domestic origin. 1) Manholes and catch basins are constructed in accordance with ASTM C-‐478. 2) Vaults are constructed in accordance with ASTM C-‐858 and ASTM C-‐913. 3) Precast trenches are constructed in accordance with ASTM C-‐858. 4) Structural design loading per ASTM C-‐857 and ASTM C-‐890. 5) All concrete minimum 4000 P.S.I. 6) Aggregate and sand supplied from Washington State Pit F-‐197 or F-‐175. 7) All rebar conforms to ASTM A-‐615. 8) Welded wire fabric conforms to ASTM A-‐497. 9) Rubber gaskets meet ASTM C-‐443.
All materials manufactured by Granite Precasting & Concrete, Inc. conform to WSDOT specifications. Additionally, Granite Precasting & Concrete, Inc. is an approved WSDOT supplier of manholes, catch basins, short span bridges, traffic barrier, and traffic curbs. Sincerely, Mark Salisbury President