Hunter Civil strengthened two earthquake-damaged, heritage stone retaining walls in Lyttelton for the Christchurch City Council located at the Anglican and Catholic cemeteries. The strengthening detail for the walls was to construct a reinforced concrete footing and retaining wall in-front of the existing stone walls. These new walls were constructed with a brown/red coloured concrete to tie in with the existing stonework and had arch relief details to allow the existing stone walls to show through. The larger of the two walls (RW2176) was located on Canterbury Street at the Lyttelton Anglican Cemetery where Hunter Civil strengthened about 31m of retaining wall varying from about 2.1-3.7m high. Hunter Civil worked with the CCC herpetologist to ensure that the resident geckos could be safely relocated to new accommodation before the main works to the wall started. Works on the Canterbury St wall included:

• Installation of 5no 450mm dia x 3m deep bored piles and 9no 600mm dia x 4m deep bored piles.

• Support of the existing walls and construction of reinforced concrete footings at their base.

• Forming and pouring a reinforced coloured concrete wall in-front of the existing heritage stone walls with exposed archways to showcase the heritage stonework.

Hunter Civil worked with Southern Stone Masons Canterbury to restore the existing stone work, relay some earthquake damaged sections and repoint the exposed stonework at the end of the project.

Works also included some drain holes and back of wall drainage as well as completion of the AC reinstatement and fencing. The smaller wall (RW2038) was located at Reserve Terrace at the Lyttelton Catholic and Public Cemetery where the length of wall to be repaired was about 17m, varying in height from about 1.7-2.3m high. The scope of works at Reserve Terrace was very similar to Canterbury Street, but on a smaller scale and without the bored piles or geckos!