263-22 Proposal - Mott MacDonald.pdf

Mott MacDonald Zayibeth Carballo, PE.-LS, CME, CFM, Assistant Municipal Engineer July 26, 2022 Page 4 of 10 2 Scope of Work Based upon the above table, the following items are proposed to be included in Mott MacDonald’s scope: ● Items 2, 7, 11-12, 14-16 Hence, our proposed scope of work is as follows: 2.1 Item 2 (Municipal Stormwater Management Plan) Mott MacDonald prepared the original MSWMP in 2005. Mott MacDonald will update the document 10-part main section, 2 tables, 3 figures and 2 appendices as applicable. The following 10 Sections will be prepared and updated: ● Introduction (Update) ● Goals (Update) ● Stormwater Discussion (Update) ● Background (Update) ● Design and Performance Standards (Update) ● Plan Consistency (Update) ● Nonstructural Stormwater Management Strategies (Update) ● Land Use/Build-Out Analysis (Now Required) ● Mitigation Plans (Update) As a result of the Land Use/Buildout Analysis, additional tables and figures will be added to the report. To complete the buildout the analysis, the Township’s inventory of total land area sorted by HUC14 and land use zone will be tabulated using available GIS data. Existing Impervious lands and wetlands/water areas will be subtracted out of the total land area to calculate the developable area. The township’s allowable impervious coverage in each zone will be applied to indicate a theoretical build-out of impervious land. An additional calculation is then made by zoning type to compute pollutant loads of Total Phosphorus, Total Nitrogen and Total Suspended Solids Loads from the buildout data using load criteria published by NJDEP (lbs/acre/yr). For the above update, we propose 90 hours of engineering and scientist time to complete this task. 2.2 Item 7 (Catch Basin Inspection and Maintenance - Part IV.B.5.b.ii) As of 2018, it is now a requirement to inspect all municipally owned catch basins and inlets at least once every five years, and then clean as frequently as necessary to eliminate recurring problems and restore proper function. However, it is our understanding that whereas all inspections should have been complete by the end of this year (2022), to bring the system into compliance all inlets require inspection at this time. Hence, Mott MacDonald proposes to conduct the inspections and record the data in accordance with the current requirements of the permit and SPPP. Based on the length of

equire inspection at this time. Hence, Mott MacDonald proposes to conduct the inspections and record the data in accordance with the current requirements of the permit and SPPP. Based on the length of municipal roads, we estimate 2,000 catch basins to locate and inspect. We estimate one field person can conduct 75 inspections a day. Moreover, we will document where cleaning and clearing are needed and