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good of cracks in the concerned wall section shall, where practicable, be carried out from the inside face. 

Adjacent internal chambers within a structure shall be tested sequentially in case the treatment process allows for emptying of the respective chamber independently of the whole structure. In this case, the chambers adjacent to the chamber under test shall be empty during the test period. 

## 6.1.14 Tolerances of dimension and surfaces of in-situ concrete 

Workmanship in formwork and concreting shall be such that the concrete shall normally require no making good with the surfaces being perfectly compacted, smooth and with no irregularities. Concrete surfaces for the various finishes shall not exceed the maximum permitted tolerances stated in the table below. 

The tolerances within which concrete work shall be constructed are as summarized below: 

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The Contractor shall be responsible for keeping the deviations of the finished concrete structures with- in the limits given, and any rectification of work not constructed within the tolerances set out shall be entirely at the expense of the Contractor. 

## 6.1.15 Remedial treatment of concrete surfaces 

Any remedial treatment to concrete surfaces shall be agreed with the Engineer following inspection immediately after the stripping of formwork and shall be carried out without delay. 

Any concrete surface which is found to have been treated before inspection by the Engineer shall be rejected. 

Any minor surface blemishes shall be repaired to the satisfaction of the Engineer immediately after completion of curing. Remedial measures may include, but shall not be limited to, the following: 

a) Holes left for formwork supports shall be thoroughly cleaned out to remove all loose material and the sides shall be roughened, if necessary, to ensure a satisfactory bond. They shall then be filled with dry-pack mortar. 

b) Fins, pinhole bubbles, surface discoloration and minor defects may be rubbed down with sack- ing and cement immediately the formwork is removed. 

