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5 Table I-a shows that the expenses incurred in the preparation of this case and that dealing with the adequacy of the water supply were in the amount of $9,002 last year. For 1951, but $3,000 has been included. This constitutes the principal difference between the 1950 and 1951 estimated figures. Joint Facility Rents This item of expense, as heretofore stated, represents the costs incurred by the Production Company in aupplying the water to the Distribution Utility. The costs involved cover both the direct expenses, as well as provision for depreciation, taxes, and interest on the capital employed in rendering the service. These charges are made in accordance with an agreement dated November 30, 1950, and which became effective January 1, 1950. The charges for Joint Facility Rents are set forth in detail in Tables IV to VI, Inclusive, in this report and Table 0 in the initial report. The direct operating expenses that were incurred and estimat­ed are; 1950 1950 1951 Est fd Actual Est'd Operation and Maintenance $25,480 $41,652 $35,011 Supervision 5,700 5,573 5,676 Management Expense 3,100 3,075 3,185 Total $34,280 $50,300 $43,872 Analysis shows that the higher charges in 1950 in the