53 Pa. C.S. § 8222
If a local government unit issues bonds or notes as general obligation bonds or guaranteed revenue bonds to provide funds for and towards the cost of making permanent street, sidewalk, water or sewer improvements or other assessable improvements, and the cost is assessed against the properties benefited, the assessments as collected shall be paid into a separate assessment fund. Moneys to the credit of the assessment fund may be used for any one or more of the following purposes in any proportions and subject to any priorities set forth in the ordinance incurring the debt:
(1) Payments to the sinking fund.
(2) Payment of the cost of such improvements.
(3) Creation and maintenance of a revolving fund if permitted by the laws governing the local government unit.
(4) Payment to the general fund or any other fund of the local government unit. The fund may be continued as a revolving fund, if permitted by law, or discontinued at any time. Unless otherwise provided in the ordinance incurring the debt, upon discontinuance of the fund the proceeds of the assessments shall be used to pay any bonds or notes remaining outstanding and to reimburse the general fund of the local government unit for the moneys paid on account of the bonds or notes.
53 Pa.C.S. § 8222