(a)
The purchase of all supplies, equipment, and materials, when the expenditure required exceeds fifty thousand dollars ($50,000), shall be by contract let to the lowest responsible bidder.
(b)
The construction of facilities and works, when the expenditure required exceeds three thousand dollars ($3,000), shall be by contract let to the lowest responsible bidder. Notwithstanding the preceding sentence, the district may elect to have this construction be governed by Article 3 (commencing with Section 22030) of Chapter 2.
(c)
Notice requesting bids shall be published at least once in a newspaper of general circulation, which publication shall be made at least 10 days before bids are received. The board may reject any and all bids and readvertise in its discretion.