Site work for a water / sewer project in Barnstable, Massachusetts. Completed plans call for site work for a water / sewer project.

The Town of Barnstable Procurement Office on behalf of the Department of Public Works hereby requests proposals for FY25 Mystic Lake Alum Treatment in the Town of Barnstable at Mystic Lake. The Contractor shall furnish, install, and perform the Alum Treatment and provide all monitoring data Question Deadline 08/01/2024 at 12:00 PM ET Questions shall be submitted in writing through the Vendor Discussion section of the online portal . The work to be performed for this project is located at Mystic Lake, which has a public access point off of Race Lane, Marstons Mills, MA, 02648. Boat access for this project is provided via a private land owner's cranberry bog at 455 Turtleback Road, Marstons Mills, MA 02648. A staging area and temporary dock for performing chemical transfer to the boat may be installed by the Contactor at the Way to Water located off of 1180 Race Lake, M arstons M ills. The contractor will deliver and apply the aluminum sulfate and sodium aluminate to M ystic Lake work limits. They will also be responsible for the pre, during, and post monitoring of the Alum Treatment. This project will apply aluminum sulfate and sodium aluminate to the M ystic Lake sediments located at 7-meters of depth and deeper with an alum dose up to 50 g/ m2 , as detailed in the technical specification below. The alum treatment can occur after October 16, 2024 and must be completed by December 15, 2024 or when water temperatures drop below 40F, whichever occurs first. Project Background: Mystic Lake is part of the Indian Ponds, a set of three kettle hole ponds in Marstons Mills, MA, a village of Barnstable on Cape Cod in M assachusetts. These lakes are hydrologically connected by the passage of groundwater and a surface water connection between Mystic Lake and Middle Pond. Surface water leaving Middle Pond through the outlet is connected to the marine environment through the M arstons M ills River. Through this stream there is an anadromous herring (marine fish that return to fresh waters for breeding) run to Middle Pond and Mystic Lake. Mystic Lake covers 149 acres (60 ha) to an average depth of 4.6 m (15 ft) with a maximum depth of 14.3 m (47 ft) and a volume of 3128 acre-feet (3.86 million cubic meters). It supplies recreational opportunities (swimming, boating, fishing, nature watching), aquatic habitat (including an alewife nursery), and water for cranberry farming in nearby bogs. Long considered a natural resource jewel, M ystic Lake experienced noticeably increased algae and decreased water clarity over the early 2000s. Internal release of phosphorus from surficial sediment exposed to anoxia was determined to be the primary source of total phosphorus to the lake at