Agenda 12-12-23; 8-k - Construction Contract with HGS, LLC T-A RES Environmental Operating Company, LLC for the Gravelly Hill Middle School (GHMS) Stormwater Wetland Retrofit Project

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2 constructed stormwater management practices and/or retrofits to existing facilities to help improve the quality of existing stormwater runoff from those existing facilities. The Project is a proposed retrofit to an existing facility that is located on Orange County property. An existing legacy stormwater basin located on the Gravelly Hill Middle School property was initially constructed in 2005 as a temporary sediment basin for erosion and sedimentation control purposes. The basin structure remained in place as a supplementary stormwater treatment basin upon completion of the school construction project and was never formally converted to a state- compliant permanent Stormwater Control Measure (SCM). Over the years, the existing legacy stormwater basin has become severely overgrown with native and non-native vegetation, and has experienced structural deterioration and heavy sedimentation throughout the basin structure. The Project will focus on rehabilitating and converting the existing legacy stormwater basin to a stormwater wetland in conformance with state standards (i.e., 15A NCAC 02H .1054 - Minimum Design Criteria for Stormwater Wetlands) and guidance as provided in the NCDEQ Stormwater Design Manual, Part C-4. The Project will help provide long-term water quality benefits to Orange County and will also offer an important opportunity to educate the general public and the students/staff at Gravelly Hill Middle School about stormwater management and the benefits of protecting, restoring, or constructing new wetlands within the local watershed. The Project is funded via IAIA funds as part of Orange County's ongoing membership with the UNRBA and Orange County's obligation to maintain joint compliance with the Falls Lake Rules' Existing Development requirements. On August 11, 2023, Orange County published Invitation to Bid (ITB) No. 367-005395 for the Project. On September 6, 2023, Orange County received two (2) qualified bids from licensed contractors for construction of the Project. HGS, LLC T/A RES Environmental Operating Company, LLC was the lowest responsive and responsible bidder with a bid price of$286,820.84. Attachment 2 is a copy of the Bid Tabulation for the Project. The anticipated timeline for construction completion is approximately 110 calendar days following the pending Notice of Award and dependent on weather conditions during the construction phase. The County's primary draft agreement for the Project is provided at Attachment 1. A complete copy of the draft 350-page construction agreement may be accessed at the following link: https://orangecountVnc.gov/Wetland FINANCIAL IMPACT: Through prior years budgeting and current year budgeting, the Board has appropriated sufficient budget for construction of the Project. A total of $316,188.03 is currently available to support the Project, with smaller related projects that are pending expenditures from that balance. The pending negotiated construction contract will not exceed the appropriated budget for the Project. SOCIAL JUSTICE IMPACT: The following Orange County Social Justice Goal is applicable to this item: • GOAL: ENSURE ECONOMIC SELF-SUFFICIENCY The creation and preservation of infrastructure, policies, programs and funding necessary for residents to provide shelter, food, clothing and medical care for themselves and their dependents. ENVIRONMENTAL IMPACT: The following Orange County Environmental Responsibility Goal impact is applicable to this item: