Mo­tor­way lid raises wor­ries over fumes

Auckland City Harbour News - - NEWS - By Rhi­an­non Hor­rell

A type of lid pro­posed to go over an ex­posed sec­tion of mo­tor­way on the lat­est op­tion for the State High­way 20 Water­view con­nec­tion is caus­ing con­tro­versy.

The area in ques­tion is the 100 to 150 me­tres be­tween the two tun­nels, near the in­ter­sec­tion of Great North and Block­house Bay roads in the Avon­dale Heights com­mu­nity.

The lid was re­cently dis­cussed at an Avon­dale Com­mu­nity Board meet­ing.

Tun­nel or Noth­ing Group ad­vo­cate Margi Wat­son says she does not en­dorse the op­tion of a lid or the cur­rent com­bined sur­face tun­nel op­tion and says if the sec­tion is cov­ered, the fumes at ei­ther end will be worse.

“The fumes will race down to Oak­ley Creek and to the Metro Soc­cer Club and will blow on to hous­ing,” she says.

New Zealand Trans­port Agency act­ing re­gional direc­tor Tommy Parker says the ef­fects of cov­er­ing the open area should be clearer when staff re­port back to the NZTA board in late Au­gust.

“We have heard peo­ple’s con­cerns about this and are look­ing at fur­ther en­gi­neer­ing de­sign to ad­dress them,” he says.

“No de­ci­sions about this have been made.”

Mr Parker says the open area of road be­tween the two tun­nels near Great North Rd is in the cur­rent de­sign.

“Tun­nel ven­ti­la­tion de­sign and air qual­ity mod­el­ing will de­ter­mine what ven­ti­la­tion is­sues are con­sid­ered.”

He says op­ti­mal lo­ca­tions for ven­ti­la­tion struc­tures have not yet been de­ter­mined.

“Tun­nel air dis­persed through a ven­ti­la­tion struc­ture in this way min­imises any ad­verse ef­fect on lo­cal air qual­ity.”

Auc k l and Ci t y Coun­cil roads man­ager Matthew Red­nall says in­put from the com­mu­nity has iden­ti­fied is­sues and one of the ques­tions peo­ple have raised is why the two tun­nels can­not be con­nected.

“We want the best out­come for the area,” he says.

Coun­cil­lor Noe­lene Raf­fills says this is the first time the is­sue has been dis­cussed.

She says coun­cil of­fi­cers dis­cussed the is­sue with NZTA to try to find a bet­ter out­come which is some kind of cut and cover.

“It was sug­gested they were tak­ing this on board – which is what this whole thing is about,” she says.

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