Ed. Code, § 81141

From time to time, as the work of construction or alteration progresses and whenever the Department of General Services requires, the licensed architect or structural engineer in charge of observation of construction or registered engineer in charge of observation of other work, the inspector on the work, and the contractor shall each make to the Department of General Services a report, duly verified by him or her, upon a form prescribed by the Department of General Services, based upon his or her own personal knowledge, indicating that the work during the period covered by the report has been performed and materials have been used and installed, in every material respect, in compliance with the approved plans and specifications, setting forth detailed statements of fact that are required by the Department of General Services.

“Personal knowledge,” as used in this section and as applied to the architect and the registered engineer, means the personal knowledge that is obtained from periodic visits to the project site of reasonable frequency for the purpose of general observation of the work, and also that is obtained from the reporting of others as to the progress of the work, testing of materials, inspection and superintendence of the work that is performed between the above-mentioned periodic visits of the architect or the registered engineer. The exercise of reasonable diligence to obtain the facts is required.

“Personal knowledge,” as applied to the inspector, means the actual personal knowledge that is obtained from his or her personal, continuous inspection of the work of construction in all stages of its progress at the site where he or she is responsible for inspection and, when work is carried out away from the site, personal knowledge that is obtained from the reporting of others on the testing or inspection of materials and workmanship for compliance with plans, specifications, or applicable standards. The exercise of reasonable diligence to obtain the facts is required.

“Personal knowledge,” as applied to the contractor, means the personal knowledge that is obtained from the construction of the building. The exercise of reasonable diligence to obtain the facts is required.