Code of Maine Rules
06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION
096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL
Chapter 570 - COMBINED SEWER OVERFLOW ABATEMENT
Section 096-570-8 - Addition of new wastewater
Current through 2024-38, September 18, 2024
A. When allowed. Unless the department determines that the nature or the volume of additional wastewater will adversely affect existing water quality of the receiving water, new sources of wastewater may be added to a sewer system having a CSO discharge point if:
B. Review and documentation. In the cases of Section 8(A)(2) and Section 8(A)(3) above, the licensee must implement additional abatement measures, if necessary, to ensure that the additional wastewater will not exceed the targeted level of control or extend the implementation schedule in the approved Master Plan (see Section 3(B)(2)(b)(vi). In the case of Section 8(A)(1) above, the licensee must document practices, measures, or programs to mitigate impacts to the combined sewer system from the added wastewater. The licensee must consider, but is not limited to any combination of the following:
C. Submissions. Documentation of additions of wastewater to the combined sewer system, and associated mitigating measures must be included in the yearly CSO progress reports (see Section 7(H)). Reports must contain the volumes and characteristics of wastewater added or authorized for addition and descriptions of sewer system improvements and estimated effectiveness.
NOTE: Stormwater runoff may contain various pollutants. Before separation projects are carried out, care should be taken to assure runoff borne pollutants are not simply redirected to the receiving water through another piping system. This is of particular concern in heavily developed areas where pollutant concentrations are likely to be higher. Licensees proposing sewer separation projects should investigate methods to control pollutants from the separated stormwater, such as the treatment and detention of stormwater through the use of stormwater Best Management Practices and reduction of stormwater runoff. Redirection of stormwater to areas supporting less sensitive uses or areas where fewer environmental impacts will result should also be considered.
