The main extension estimate shall serve as a basis for determination of any required customer contribution. The costs of the main extension and the service lines shall be kept separate in order to allow reallocation among customers of the cost of the main extension alone pursuant to subsection D. For the purposes of these rules, actual costs shall be reasonable and shall not exceed costs recorded in conformity with accepted water utility accounting practice as defined in the Uniform System of Accounts for Water Utilities prescribed by this Commission.
Where
TC = Total contribution including taxes
C = Contribution after deduction of present value of tax reductions resulting from tax depreciation (step 5)
FIT = Federal Income Tax marginal rate
SIT = State Income Tax marginal rate
The applicant(s) shall be required to advance the customer contribution, if applicable, and the cost of the service drop to the utility no more than two weeks prior to the start of construction, of a utility no more than two weeks prior to the start of construction, of a new main or connection to an existing main extension or main. The utility may require a deposit of the cost of materials and supplies and detailed engineering design, or some portion thereof, two months prior to the commencement of construction of a main extension. Any portion of the deposit actually spent for detailed engineering design or for materials and supplies which cannot readily be used for other projects by the utility shall not be refundable. Within 60 days following receipt by the utility of the final bills for the extension, adjustment shall be made for any differences between the estimates and actual costs of the extension and service line or lines.
No construction of a main extension or service drop shall be commenced until the utility and the customer have executed a written contract. The contract shall incorporate this rule by reference, shall state that in the case of a conflict between the contract and the rule, the rule shall govern, and shall state that the provisions of the contract are subject to alteration by Public Utilities Commission decision or rule.
When new customers are added to an extension, customer contributions to the line extension for existing and new customers shall be recalculated as provided in Paragraph D.
65- 407 C.M.R. ch. 65, § 3