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