Repeating the short-term high-frequency sampling events throughout the production cycle could alleviate their lack of precision, while the length of the weekly grab sampling strategy could be reduced without sacrificing too much precision. As the cost and effort of monitoring increase with the number of repeated sampling events, or the length of a weekly sampling strategy, the resources required should be balanced against the required precision. The present contribution presented a method that can be used as a guideline to negotiate this trade-off.