Money which is deposited pursuant to Section 64696 may be invested and reinvested by the Treasurer or the council in any of the securities described in Article 1 (commencing with Section 16430) of Chapter 3 of Part 2 of Division 4 of Title 2 of the Government Code, or placed in a depository as provided in Chapter 4 (commencing with Section 16500) of Part 2 of Division 4 of Title 2 of the Government Code, and handled in the same manner as money in the State Treasury. For these purposes, the money may also be combined with funds which are determined by the director to be available for investment pursuant to Section 58939. Any increment which is received from investment, reinvestment, or deposit made by the Treasurer shall be remitted to the council. The Treasurer may deduct from the remittance an amount equal to the reasonable cost incurred in carrying out this section or may bill the council for the costs, and the council shall pay the costs from money which is collected for it pursuant to this chapter.