The British Columbia government is denying Prime Minister Justin Trudeau's claim that it has been mum on how Ottawa should reinforce environmental protections — offering as proof a detailed list of six demands it says were provided to the federal government in February.

The list was given to the federal Liberals right after B.C. warned it was considering whether to restrict the flow of diluted bitumen into the province should the Trans Mountain pipeline expansion be allowed to proceed, an official told The Canadian Press.

The demands include:

Ensuring enough emergency tow vessels in response to increased tanker traffic off the B.C. coast

Specific plans to respond in the event of an environmental incident related to the pipeline

Improvements to make the pipeline itself safer

A compensation plan in the event of a spill causing the loss of public use of a marine environment

Improved research into the behaviour and cleanup of spilled diluted bitumen

Weaning marine coastal communities off diesel-fuelled electricity.

"Over the past year, particularly in February 2018, B.C. identified a number of gaps in existing spill prevention and response both on land and in our coastal waters," said the official, who spoke on condition of anonymity because they weren't authorized to speak publicly.

"These discussions were not limited to, but included, measures related to the Oceans Protection Plan."

Prime Minister Justin Trudeau, left, unveiled the $1.5-billion Oceans Protection Plan with Minister of Transport Marc Garneau in Vancouver on Nov. 7, 2016. (Darryl Dyck/Canadian Press)

On Sunday, following a meeting with the premiers of B.C. and Alberta over the Trans Mountain impasse, Trudeau said he was open to making additional investments and improvements in environmental protections for B.C.'s coastlines — over and above the government's Oceans Protection Plan — to help mitigate the concerns of environmental opponents.

But, he said, since the NDP government was elected in B.C. last summer, it has "not specifically put forward proposals on how they would like to see us improve the Oceans Protection Plan."

Not calling Trudeau a liar

B.C. Environment Minister George Heyman wouldn't accuse Trudeau of lying outright.

"What I'm saying is we've been engaged with the federal government, there's been ongoing discussion and we've raised a number of issues," Heyman said.

"We've indicated to them the kinds of things we think would be helpful to prevent contamination of the coastline from a spill and a variety of hazardous products."

Parkland Fuel Corp operates the 57,000-barrel-a-day refinery in Burnaby on the shores of Burrard Inlet. (Darryl Dyck/Canadian Press)

Trudeau's government insists it has the necessary environmental policies in place in order to allow a pipeline expansion that Ottawa and Alberta agree is necessary to get maximum value for Canada's fossil fuels.

B.C. opposes the project, saying not enough is known about diluted bitumen. In January, the B.C. government said it would consult about the gaps in knowledge, hinting at the possibility of regulation to restrict the flow of bitumen into B.C. in the interim.

"We wanted that information so we could ensure the recommendations were put in place before there was any additional movement of crude oil," Heyman said.

An oil tanker is guided by tugboats as it passes under the Lions Gate Bridge at the mouth of Vancouver harbour. (Jonathan Hayward/Canadian Press)

The ongoing risk of delays has led pipeline builder Kinder Morgan to halt non-essential spending on the project until investors can be assured the project will be completed.

Trudeau said he has asked Finance Minister Bill Morneau to work with the company on a financial solution that would ease the risk to investors, while his government prepares legislation that would re-assert federal authority to make decisions about pipeline projects.​

Further discussions welcomed

Asked about B.C.'s rebuttal of Trudeau's claim, Alexandre Deslongchamps, a spokesperson for Natural Resources Minister Jim Carr, said earlier Monday that senior federal officials travelled twice to B.C. in February to talk about the details of the federal oceans plan.

"These measures improve marine safety and responsible shipping, protect Canada's marine environment, and offer new possibilities for Indigenous and coastal communities," Deslongchamps said.

"In the course of these discussions, senior officials sought to understand British Columbia's perspectives and presented ideas for further collaboration. We welcome further discussions with British Columbia on specific proposals the provincial government may wish to provide for consideration and on ways our governments can further work together."