263-22 Proposal - Mott MacDonald.pdf

Professional Services for Geographic Information Systems (GIS) Development of Municipal Separate Storm Sewer System September 9, 2022 Dear Ms. Carballo: Mott MacDonald is pleased to submit this proposal to provide continued support of the Township’s MS4 permit compliance. The following proposal letter is an additional requested item related to Item 11b as noted in our proposal letter to you dated July 26, 2022 revised September 9, 2022. This item addresses forthcoming MS4 permit compliance effective 1/1/2023 requiring the Township to “map” its entire MS4 system. Based upon our discussions and recognizing NJDEP’s mapping requirements and standards, our approach will be similar to other NJ municipalities where we have initial and subsequent refinement of storm sewer utility GIS databases. We believe with this phased approach the Township will be well- positioned to enter the next permit cycle in good standing and compliance. Project Understanding The Township of West Orange is seeking a qualified consultant to perform the necessary Geographic Information System (GIS) database development required to inventory the Township-owned MS4 assets. The database will be developed from a combination of available historical maps and the existing outfall GIS inventory. The Township has historical mapping that depicts portions of the MS4 system on forty-two (42) tax maps. It is not known when the maps were last updated but there are areas of the Township developed in the 1990’s that are not depicted on the maps. The completeness of the mapping is also not known as there are areas for which outfalls were found in the field but no MS4 assets are depicted on the corresponding historic map (ex. Wigwam Brook Area). The MS4 mapping typically terminates at the County roadway. Given the unknown nature around the completeness of the historic mapping Mott MacDonald recommends a phased approach to the development of the Township’s MS4 GIS Database. Zayibeth Carballo, PE, PLS Assistant Municipal Engineer 25 Lakeside Ave West Orange, NJ 07052 Mott MacDonald 111 Wood Avenue South Iselin NJ 08830-4112 United States of America T +1 (800) 832 3272 www.mottmac.com/americas