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All other proposed development projected to generate new base sanitary flow of over 100,000 net gallons per day (gpd) into a CIP-size trunk sewer or wastewater pumping station shall be modeled to determine potential impact on that CIP-size trunk sewer or wastewater pumping station. Modeling conditions shall include the existing sewer system, any proposed sewer system improvements under construction at the time of the HPA or HPA amendment under review by WSSC, existing dry weather flows (including groundwater infiltration), rainfall dependent infiltration and inflow from a 10-year design storm specified by WSSC, the proposed base sanitary flow from the development under review, and the proposed base sanitary flow from any other developments in the subject sewer basin with an approved and unexpired HPA that are also projected to generate more than 100,000 net gallons per day.

Under these conditions, there shall be no projected overflows from the sewer system caused or exacerbated by the proposed development. Otherwise, the applicant shall be required to implement sewer system improvements that eliminate the risk of overflows under the 10-year storm and eliminate excessive surcharging under a two-year design storm specified by WSSC. Consideration and evaluation of alternate solutions including construction of new sewer lines and facilities and/or rehabilitation/reconstruction of existing sewer mains, appurtenances, and facilities may be required. Any new sewers or facilities built shall be sized to handle the projected future base sanitary flow and infiltration and inflow from the 10-year design storm. In addition, the development will be evaluated for the potential impact of any projected surcharging and, in particular, the potential for causing backups into homes or businesses.

WSSC may allow service to the development prior to the release for service of the sewer system improvements required herein only if the applicant shows proof of start of construction of the sewer improvements, as defined herein. Depending on the size and scope of the required sewer improvements, WSSC may also place additional conditions upon applicant, as determined by WSSC, prior to allowing WSSC service to the development at start of construction. Additional requirements, if any, shall be set forth in a memorandum of understanding signed by the applicant and WSSC on or before the date that the SEP is issued for required sewer improvements. (REG-IFSM-EC-2016-007)