According to Article 9 of the Detailed Rules for the Implementation of Witness Sampling and Inspection of Housing Construction and Municipal Infrastructure Projects in Jilin Province, the incoming inspection of building materials (products) is subject to the witness sampler filing system, and the supervision unit authorizes the required number of witnesses in writing according to the project scale, and the construction unit authorizes the required sampler in writing to the construction project quality supervision institution where the project is located for filing according to the project scale.

Witnesses should be familiar with the sampling and inspection methods of various test blocks, specimens and materials. Witnesses shall make witness records and file them in the project supervision files. Sampling personnel should be familiar with witness sampling standards and operations, and the sampling of samples for inspection should be standardized. Witnesses can be held concurrently by professional supervision engineers, and samplers can be held concurrently by technicians.

Extended data:

Implement relevant requirements of witness sampling and inspection;

1, engineering quality supervision institutions at all levels shall re-inspect, supervise and sample the materials that have been inspected in each unit project for not less than 1 time, and entrust a third-party inspection institution to re-inspect the materials that have been inspected in the site.

2. When the qualification judgment conclusion of the supervision sampling inspection is inconsistent with the witness inspection conclusion, the supervision sampling inspection result shall prevail. When the sampling inspection results are disputed, the trade association shall organize experts to analyze the re-inspection results, so as to reflect the real quality of the purchased materials fairly, justly and openly.

3. For the project inspection items subject to witness sampling inspection, if the inspection is not conducted in accordance with the regulations or the frequency of inspection can not meet the requirements, it shall be identified or sampled for inspection according to the actual situation, and the inspection and appraisal expenses shall be borne by the responsible party. Without testing or testing results can not meet the requirements, the division of the project will not be accepted, and should be handled in accordance with relevant regulations.

Ministry of Housing and Urban-Rural Development of Jilin Province-Notice on Printing and Distributing the Detailed Rules for the Implementation of Witness Sampling and Inspection of Housing Construction Projects and Municipal Infrastructure Projects in Jilin Province