4.3 AccuracyThe maximum error between permanent survey control stations shall not exceed 1 in 20,000. For distances between adjacent permanent survey control stations of less than 300 metres, the maximum error should not be greater than ± 15mm. If ties to the existing control network prevent this level of accuracy, the differences shall be highlighted to the EMPLOYER for resolution prior to continuing the Survey.For purposes where lower levels of accuracy may be appropriate. Alternatives shall be agreed with the EMPLOYER.
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