(a) The number of samples to be taken, the sampling frequency, the duration of the sampling project and a description of the sampling method (including quality assurance procedures put in place, e.g., field blanks and chain-of-custody);
(a)　拟收集的样品数目、取样频度、取样项目的时间长度、以及取样方法说明（包括订立质量保证程序，例如空地和样品保管链条）；