UPDATED, Wednesday, 7.55am:
Western District Health Service has been advised of a positive COVID-19 case, who worked in Hamilton from Tuesday last week to Thursday.
A painter was employed by a Melbourne company working at the Pedrina Park Pavilion construction site, who returned a positive test result in Melbourne.
A WDHS spokeswoman said it has now been determined that at least one other person from the painting company, who was in Hamilton at the same time, has also tested positive.
She said both workers stayed at the Hamilton Townhouse Motel, in Shakespeare Street for two nights on Tuesday and Wednesday last week.
"The workers returned to Melbourne on Thursday," she said.
"Contact tracing interviews are continuing and any further exposure sites will be listed on the WDHS and Department of Health websites.
"We will be doing our best to keep the community informed."
Pedrina Park Pavilion construction site is listed as a Tier 1 exposure site and the Hamilton Townhouse Motel a Tier 2 site.
Anyone who has been to a Tier 1 site must get tested and isolate for 14 days from the date of exposure, regardless of test result.
Their household secondary contacts (the people they live with) must also isolate for 14 days from the date of exposure.
If you have attended a Tier 2 site you must get tested and isolate until you receive a negative result.
The spokeswoman said the response from local business to the emerging risks, had been outstanding.
"Staff and tradies impacted have quickly isolated and presented for testing at the WDHS drive-thru," she said.
"WDHS is extending the hours of its drive-thru testing clinic on Wednesday (today) and will be operating from 10am to 4pm.
"We are also opening a mass-testing clinic at the Hamilton Showgrounds from 8am to 6pm Thursday.
"A decision will be made on continuing to operate the mass-testing clinic, based on demand.
"Until the mass-testing clinic has opened, I would request that only people who are symptomatic and those who have visited Tier 1 and 2 exposure sites present for testing.
"Anyone who is unwell with any symptoms of COVID-19, no matter how mild, (such as fever, chills, cough, sore throat, runny nose, loss of sense of smell), should get tested immediately and stay at home.
"It's been fantastic to see our vaccination rates continue to rise with steady but significant progress each week.
"This development is a stark reminder for those who remain unvaccinated to get the jab - it could save your life," she said.
Tuesday night: A Hamilton motel has been listed as a tier two exposure site along with the tier one exposure sites at Pedrina Park.
The Hamilton Townhouse Motel in Shakespeare Street was listed as a tier two site between 3.30pm on September 14 until 8.30am on September 16.
Earlier: A construction site in Hamilton has been listed as a tier one exposure site it was announced late on Tuesday.
The Western District Health Service has listed the Pedrina Park Pavillion construction site as a coronavirus tier one exposure site on September 15 and 16 between 7am and 5.30pm.
People who have visited a tier one exposure sites are to get tested and isolate for 14 days, regardless of the result.
The Western District Health Service drive-through testing clinic will operate with extended hours tomorrow from 10am to 4pm.
Anyone who has COVID-19 symptoms or has been to an exposure site should get tested, and follow the Department of Health's instructions.
The Shire of Southern Grampians is currently leading the way in the region for vaccine doses.
Data released on Tuesday shows 86.4 per cent of people had had their first dose, and 56.4 per cent had had their second dose.
Pedrina Park is currently undergoing a $1.6 million revamp.
From 11.59pm on Monday, the construction industry was shut down for two weeks which included Melbourne and extended to the hotspot areas of The City of Ballarat, the City of Greater Geelong, Surf Coast Shire and Mitchell Shire.
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