Mule Pen Quarry Restoration

Agnoli, Barber & Brundage was the project engineer on a very high-end proposed golf club. The geographical location of the project was very near the coast. Therefore, fresh water resources for irrigation supply was limited to non-existent. The project sponsor asked that we investigate reuse water as would have been supplied by Collier County’s north IQ water service system. After considerable effort in pipeline preliminary designs, it was determined that Collier County did not have sufficient IQ water available to provide for a reliable water source for this project, nor could they commit to a time frame of when the supply would be available. After exhaustive study of other alternatives for IQ water supply, the client decision was that only Collier County’s system would be acceptable and that they would design infrastructure necessary to make the County’s system more reliable for their use.

Investigation of all other opportunities led the project team east of town to locate a freshwater source meeting the requirements of the County. Namely, the water could not have odor as usually associated with Tamiami zone water (sulfur) and the iron concentration could not be above the levels that would cause staining (as usually associated with shallow groundwater). Other factors needed to be considered, such as permit criteria from SFWMD indicating the necessary proximity from wetlands and drawdown impacts.

The end result of the study was the permitting of a 3.5 mgd fresh water wellfield located near the then Mule Pen Quarry which came to be known by the County as the Mule Pen wellfield. With the source identified and the wellfield concept permitted, the distribution aspects of the system needed to be analyzed. The entire north IQ water distribution system was modeled using WaterCad. Collier County did not have a functional model of their system at the time, so the numerical model needed to be built from scratch using various sources such as record drawings, IQ water contracts for demand estimation, storage availability, etc. After the existing model was built and calibrated for accuracy, the proposed improvements were added. The model was used to size the well pumps and the pipeline and control systems needed for this wellfield to function automatically with little or no operator intervention.

This project included six (6) wells with telemetry, VFD, SCADA, and digital computer controls, approximately 2 miles of PVC piping, several major road crossings, and coordination with 2 major road expansion projects that were in the design stages while this project was being built.

Agnoli, Barber & Brundage’s services included: lead project manager, hydraulic modeling, route surveying, pipeline design, permitting, construction layout, CEI, public involvement and project certification/closeout. This project was completed on a very tight time schedule, on time and at budget.

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