Sunrise Lake Culvert Modification and Stormwater Control Project , Middleton , NH

2026-11-03

Task 1 . Site Preparation and Mobilization Construction sequencing and site preparation shall occur according to plans titled , “ CULVERT MODIFICATIONS PLAN & PROFILE ” and “ LAKELAND ASSOCIATION BEACH ,” prepared by Underwood Engineers ( 2025 ), as well as project - specific conditions identified in the approved permits from NHDES . NOTE : SRPC , in conjunction with project partners , will be responsible for obtaining and staging all construction materials , as well as coordinating with landowners as referenced in Section VIII ( 10c ). Task 2 . Culvert Modification The culvert modifications shown on the Plan titled , “ CULVERT MODIFICATIONS PLAN & PROFILE ” ( Underwood Engineers , 2025 ), include a culvert improvement at an unnamed perennial Tier 1 stream crossing that runs across Lake Shore Drive and has an outfall that leads into Sunrise Lake . Approximately 64 linear feet of the existing 24 " CMP culvert will be removed , with only 16 linear feet being replaced . The remaining 48 linear feet will be daylighted in a natural channel with native plantings to simulate a natural stream . This project seeks to reduce chronic erosion and phosphorus transport to the lake , infiltrate stormwater , and reduce runoff volume . Task 3 . Stormwater Control Measures – Rain Garden ( RG # 1 ) and Swale The stormwater control measures on the Plan titled , “ LAKELAND ASSOCIATION BEACH ” ( Underwood Engineers , 2025 ), include the construction of three rain gardens designed to treat stormwater runoff and reduce phosphorus loading to Sunrise Lake . Rain Garden # 1 ( RG # 1 ) and the subsequent 4 - foot - wide riprap swale is the minimum construction requirement for the proposed stormwater control measure associated with this request for bids . It is designed to be oval - shaped ( 31 ' x 21 ') with 2 : 1 slopes ...

New Hampshire

2026-04-28