Dear New Zealand Transport Agency,
I refer to Mr. Chris Hunt's (Senior Manager Project Delivery) response to Chris Turver under OIA-3860 dated 22 June 2018 in which he failed to adequately answer several important questions relating to failure of the Kapiti Expressway road pavement.

To allow the public to have a full appreciation of the endemic and premature failure that has occurred to the Expressway pavement, please supply the following information and details under the Official Information Act 1982.

1. The specific Terms of the Alliance Agreement in relation to:
(a) Design of the porous pavement.
(b) Testing of the proposed pavement design.
(c) Supervision of pavement construction.
(d) Contractual liability of Alliance partners for fault or negligence in provision of each partners services.

2. Who were the professional advisers responsible for the Porous pavement design and supervision (or observation) of construction? Did NZTA staff have any input into the technical design of the pavement construction?

3. What was the porous pavement engineering design detail used for construction including but not limited to all aspects of: subgrade; basecourse; topcourse, impermeable barrier; crossfall grades; drainage collection and disposal methology; porous asphalt paving thickness?

4. What was the purpose of providing asphalt overlays to the left hand lanes of both north and southbound lanes between Paraparaumu interchange and Mazengarb Rd overbridge, following initial pavement failure?

5. What is the detailed design of the new construction repair work currently being undertaken on the northbound left lane mentioned in 4 above and how will this result in a guaranteed repair suitable for the expected design lifetime of a State Highway road of significance?

6. Is the current latest repair option going to be replicated on all lanes of the Expressway?

7. How is it possible for a Govt organisation (NZTA) to be both the client/funder and also an Alliance member responsible for the delivery of the project and "the remedial treatment of all defects"?

8. In Mr. Hunt's OIA response he stated "The cost of pavement repair work will be covered in accordance with the Terms of the Alliance Agreement." What are the specific Terms in the Alliance Agreement relating to repair work and responsibility for payment?

9. How much have repairs cost since the Expressway was opened until 30 June this year and how much of this cost has been funded by NZTA?

10. What proportion of total repair costs are likely to be paid by NZTA?

Yours faithfully,
Laurie Petherick, BE. CMEngNZ

26 Major Durie Place,
Waikanae Beach
Ph 04 2932 304
0274 477 439