She said it was not known how many people were involved in the brutal assault. The weapon used to strike the unwitting worker was also a mystery.
"Police staff are absolutely disgusted by this offending. An innocent member of our community was just doing his job, when he was struck over the head and left there unconscious. This could have been far more serious had a member of the public not found the victim and called for help," she said.
The worker is now in a serious but stable condition in Auckland City Hospital.
Police were appealing for anyone who witnessed any suspicious behaviour in the area to call police.
The injured man was using his silver coloured Subaru Impreza at the time of the attack.
"If you saw anything then please contact police as soon as possible. Even if it is something minor, we want to hear about it," said Farrant.
"We want to hold whoever is responsible for this crime to account and place them before the courts.
"People have a right to go to work and do their job safely without being violently assaulted. It is simply not good enough and the Waitakere community will not accept it."
Anyone with information was asked to called Detective John Schieb at Henderston Police Station on 839 0600 or Crimestoppers anonymously on 0800 555 111.
