National Road Network Services-Asset Preservation of National Roads-Rehabilitation/Reconstruction of National Roads with Slips, Slope Collapse, and Landslides-Tertiary Roads-Ilocos Norte-Apayao Road, K0517+704-K0517+734, K0520+213-K0520+333, K0522+794-K0522+809, K0523+041-K0523+051, K0523+284-K0523+294, K0523+411-K0523+421, K0523+682-K0523+702, K0523+825-K0523+835, K0524+445-K0524+465, K0526+612-K0526+642, K0527+544-K0527+574, K0528+331-K0528+381, K0528+773-K0528+793, K0530+165-K0530+185, K0531+225-K0531+255, K0531+325-K0531+345, K0531+932-K531+947,K0532+047-K0532+062, K0532+105-K0532+125