Okaloosa County BOCC — May 17, 2016 — Meigs Drive Drainage Improvements - Engineering — agenda request

BOARD OF COUNTY COMMISSIONERS AGENDA REQUEST DATE: May 17, 2016 TO: Honorable Chairman and Members of the Board FROM: Jason Autrey SUBJECT: Meigs Drive Drainage Improvements - Engineering DEPARTMENT: Public Works BCC DISTRICT: 2 STATEMENT OF ISSUE: A portion of Meigs Drive, Shalimar Florida contains a crossdrain that facilitates the flow of water to and from the freshwater wetlands on the north to Lake Vivian. The crossdrain and approaches need to be designed to increase water flow, reduce frequent flooding and replace deficient stormwater infrastructure. BACKGROUND: According to the 1981 Port Dixie Subdivision Plat map, Meigs Drive was platted to separate a wetlands area from Lake Clyde (now commonly called Lake Vivian) and provide ingress/egress to residents of Port Dixie to the east. The plat indicates two 42” arched corrugated metal pipes (CMP) would serve to preserve hydraulic connectivity between the wetlands and the lake. At the time, CMP was an extremely popular and inexpensive material available for stormwater conveyance. Since the flow of water through the crossdrain is also tidal influenced and the water in Lake Vivian is brackish, corrosion of the CMP was accelerated and marine organisms such as clams and oysters thrived inside the piping. The effect of these influences was to reduce the efficiency of water flow between the two areas. To compound the issue, Meigs Drive from addresses 29 to 36B were constructed at a very low elevation. This section of road is frequently flooded in moderate rainfall events and even during light rainfall events when the tide and wind are a factor. In fact, flooding is so frequent that signage supporting road closure is staged near the project area for quick access. In order to relieve the constant threat of flooding, road closure, and maintenance, Public Works has determined that increasing the hydraulic capacity of the system and raising the elevation of the road will be necessary. This Task Order will provide the engineering and permitting necessary to accomplish this at a budgeted cost of $69,595. OPTIONS: Approve/Disapprove the Hatch Mott MacDonald Task Order proposal (attached) for Meigs Drive Drainage Improvement Plan engineering services. Hatch Mott MacDonald is a Board approved Engineering Services provider to the Public Works Department under contract C14-2080-PW through September 30, 2016. RECOMMENDATIONS: Approve the Hatch Mott MacDonald Task Order proposal (attached) for Meigs Drive Drainage Improvement Plan engineering services not to exceed $69,595 in accordance with contract C14-2080-PW. RECOMMENDED BY: APPROVED BY: John Hofstad, County Administrator