construction of retaining wall at rd 0/250 to 0/265, 0/300 to 0/310, 1/875 to 1/885, 4/875 to 4/890, 4/900 to 4/915, breast wall at rd 4/950 to 4/965, unlined surface drain from 4/750 to 5/300 and 5/700 to 5/850 and 900 mm dia hume pipe culvert at rd
