DMK Municipal Projects

Loop Phase 1A Interconnect

Following a feasibility study completed by Charlotte County Utilities, the Peace River Manasota Regional Water Supply Authority obtained financing support from SWFWMD and proceeded with the design and permitting of this 11-mile, 24" pipeline Regional Integrated Loop System that would connect the water supply systems of the PR/MRWSA, Charlotte County and the City of Punta Gorda.

The project includes a 7,400-foot section crossing the Peace River, as well as necessary waterline extensions to the intersection of Kings Highway and I-75 in Port Charlotte, and the Shell Creek Water Plant in Punta Gorda. Also in Punta Gorda, DMK designed an above ground storage tank, high service pumping, chemical adjustment and point of delivery meters. This system will provide a direct connection between the Peace River Plant, owned by the Peace River Authority and the City of Punta Gorda Shell Creek Water Plant, while providing a number of tie-in points into the Charlotte County transmission system.

DMK's survey department established horizontal and vertical controls for the 11 mile route, as well as performed a 100'wide, 7500' long bathymetric survey of the Peace River and a strip topographic survey of 11 miles of roads and open space in Pt. Charlotte and Punta Gorda.

Permitting involved practically every regulatory agency in the State of Florida as well as the US Corps of Engineers, EPA and the US Coast Guard.

Construction was completed in October of 2012 with DMK providing full Construction Engineering and Inspection services.

Alligator Creek Waterway Maintenance Feasibility Study

Alligator Creek is a natural channel that has experienced human alterations and modifications. The Creek is a four mile long waterway in South Venice with the study focus being the portion of the Creek, an approximately 9,200 feet long natural system, starting South of US 41 and ending at the Intercoastal Waterway.

A 1948 aerial of the study area showed a natural, meandering creek. State records indicated that only one dredge permit was issued, in July 1976, for 1,100 feet of the creek immediately north of the Intercoastal Waterway. Yet, aerial photographs obtained from the years 1967 and 1972 show a channel with rounded curves (ox-bows), which for the most part had been realigned. These historic aerials provided supportive evidence of past dredge activity, except for approximately 2,000 feet of the creek South of the Shamrock Bridge, which appears to have been left in its natural state.

Forty preliminary sediment depth samples were obtained for the defined project area showing a creek bottom with sediment depth of 8 to 13 feet below Mean Low Water (MLW) elevation. The sediment depth showed significant increase downstream of several stormwater outlets along the alignment. DMK recommended applying for a dredge permit exemption to 5 feet below MLW, for the entire length of the Alligator Creek study area. A design dredge width of 20 feet was recommended for the first 800 feet South of the US 41 Bridge and a width of 30 feet was recommended for the balance of the Alligator Creek under study.

Dredge volumes were calculated for the proposed footprint resulting in 42,000 cubic yards to be removed. Sediment samples were collected at three locations along the project. The laboratory analysis was performed on the samples for physical and chemical evaluation. Grain size results indicated all three samples were characterized as poorly graded fine sand. Considering the excessive siltation observed throughout the waterway maintenance project, DMK recommended mechanical dredging and determined project cost estimates.

Rehabilitation of Master Lift Station D

DMK performed the evaluation and design for the rehabilitation of Master Lift Station D on Longboat Key which was originally constructed in the early 1970's and has a maximum pumping capacity of 4,000 GPM. The station was due for cleaning, repair and refurbishment or total replacement. Also, due to development on the island, the wet-well and pumping capacity of the lift station needed to be reevaluated.

DMK performed an extensive physical inspection of the existing lift station structure and equipment. Historical pumping data was reviewed over a period of time to determine the minimum average and peak flows. DMK also gathered information by examining record drawings of each contributing lift station and the surrounding utilities system. DMK also provided a topographical survey of the lift station site and performed geotechnical core sampling near the wet-well and at alternative wet-well sites. This information was included in a 30% design report presenting the existing condition, operating requirements and a list of recommended repairs, replacements and upgrades for each lift station. DMK also provided an option for total replacement of the lift station on the existing site. After reviewing this report with the Client, it was determined that DMK would provide a set of plans, specifications and bid documents for the total replacement of this lift station. This option allowed the existing lift station to remain operational until construction of the new lift station was complete, minimizing the risks associated with bypass pumping. The new lift station includes a new wet-well, 4 VFD controlled submersible pumps with a maximum capacity of 4,000 GPM, and an odor control system. The system is PLC controlled and is integrated as a single node on the Town's existing SCADA system to allow remote monitoring and control of wet-well level, flow rate and pump operation. Construction on this project was completed at end of 2011 with DMK providing construction administration and inspection services.

Gulf Gate Neighborhood Enhancements

Sarasota County desired to connect isolated areas in the Gulf Gate neighborhood to the main pedestrian corridors already in existence.

DMK attended public workshops with County staff to gather input from citizens. After compiling information from these meetings, DMK prepared the preliminary design of the area sidewalks. The final design included complete drainage design and piping, inlets and swales and utility relocations as required.

Survey work consisted of horizontal and vertical controls and collection of existing above ground improvements and topography.

The Gulf Gate Elementary sidewalk project is located in 2 Basin Watersheds, the Phillippi Creek Watershed and the Little Sarasota Bay Watershed. DMK revised both of the ICPR models for these watersheds and prepared the revised existing and proposed conditions models. In this process we found that there was flow across the boundaries of the watersheds and linked the models using rating curves. SWFWMD and Sarasota County permits were obtained for the project.

During construction, DMK provided onsite construction inspection services to support contractor activities and to resolve any unknown conditions that were encountered. Best Management Practices were observed during construction which was completed in early 2011. DMK prepared and provided record drawings to Sarasota County for the approximately 7 miles of 5 feet wide concrete sidewalks that included several bus stops with shelters and deployment areas.