California Code, Public Contract Code - PCC § 10843

(a) After written notice of at least five days to the contractor, specifying the defaults to be remedied, provide any such labor or materials and deduct the cost from any money due or to become due to the contractor under the contract; or

(b) If the trustees consider that the failure is sufficient ground for such action, they may give written notice of at least five days to the contractor and the contractor's sureties, that if the defaults are not remedied the contractor's control over the work will be terminated.