Specifications include, but are not limited to: TASK 1. PROJECT MANAGEMENT The Consultant will be responsible for team communication, coordination and documentation of project goals, deadline coordination, dissemination of documents for client review, and coordination and submission of final deliverables. The Consultant shall develop a Quality Assurance Project Plan (QAPP), public outreach strategy, development of a stakeholder engagement plan, overall project timeline and schedule, and finalization of project goals with the stakeholder team. Careful project management will keep the project onschedule and on-budget. B.5 TASK 2. EXISTING CONDITIONS ANALYSIS AND LITERATURE REVIEW The Consultant shall produce a detailed topographic and hydrologic analysis of the area, including document all storm drain locations, surface types (e.g., impervious vs. pervious), and locations where existing stormwater drainage infrastructure is insufficient or is operating incorrectly (e.g., locations where drainage capacity is insufficient, or where grading is inadequate). Topographic and surface type analysis shall be developed with the best-available data, including the Connecticut Statewide LiDAR 2016 dataset, which provides a resolution sufficient for generating 1 foot contour intervals. Additional verification may occur in the field. The surveyed information shall be documented in GIS in the form of a digitized map to facilitate improved analysis of limitations and needs, as well as opportunities for improvement (e.g., potential locations for siting green stormwater infrastructure). This assessment shall also identify potential locations for tree plantings, which may be co-located with GSI locations. The Consultant shall coordinate with TNC in engagement efforts with residents, area businesses, and interested stakeholders to develop a communitylevel understanding of flooding, and perceived vulnerability in the Five Corners Neighborhood. This task will also include a review and synthesis of relevant reports, plans, and studies in the area and greater literature review of Nature-based, Green Stormwater Infrastructure (GSI), and Low-Impact Development (LID) projects in the Long Island Sound Watershed (see Table 1). The findings of these studies will be documented in an Existing Conditions report. The expected outcomes of this phase of work will allow the City of Groton to pursue future actions identified in Recommendations 4.1.2-4.1.6 in its 2022 Community Resilience Plan. TASK 3. PRELIMINARY DESIGN RECOMMENDATIONS The Consultant shall produce a stormwater plan that recommends appropriate GSI interventions for the Five Corners Neighborhood, and improvements to existing stormwater infrastructure, which will be used as the basis-of-design for subsequent implementation. These recommendations will be developed in response to the specific hydrologic conditions and land uses of the Five Corners area identified in the Existing Conditions Analysis. This phase shall prioritize the use of nature-based, Green Stormwater Infrastructure, such as bioretention cells, tree filters, vegetated filter strips, etc. Evaluation of these features shall consider spatial constraints in the Five Corners Neighborhood, including narrow sidewalks and constrained roadways due to parking aisles. Due to the significant extent of paved surfaces and commercial parking lots servicing Electric Boat’s facilities, there will also be a need for recommendations on “grey” infrastructure, such as pretreatment BMPs to reduce coarse sediment and debris upstream of other structural BMPs, and Infiltration BMPs to reduce stormwater runoff volumes and pollutant loads and increasing the adoption of permeable paving. The Consultant shall develop a stormwater management concept design for the Five Corners Neighborhood. This design shall include a conceptual plan for the area, and identify the relevant interventions the area. Additionally, typical cross sections shall be used to further describe the intervention.
