SandRemovalReplacementChanging.pdf

PDF 26 KB Posted

Attached to
Water Reclamation Sand and Sludge Management
Solicitation number
26-008UO-HK-RFP
Issued by
Hillsborough County, Florida

About this file

This is a technical reference document and request for proposals issued by the City of Plant City, Florida, for sand and sludge management services at the Water Reclamation Facility located at 1500 Victoria Street. The City seeks responsible vendors to provide comprehensive sand filtration maintenance, sludge management, and facility cleaning services on an as-needed basis through individual work orders. The scope of work includes mobilization and demobilization, pressure washing and cleaning of aeration basins and clarifiers, grit removal and hauling, sludge pumping and hauling, sludge testing, removal of existing sand media, supply and installation of new approved sand, and disposal of removed sand in compliance with applicable regulations. Proposals must be submitted electronically through the City's e-Procurement Portal by March 26, 2026, at 2:00 p.m. local time and shall not exceed fifteen pages, with a question submission deadline of March 16, 2026, at 5:00 p.m. The resulting contract will commence upon issuance and extend for an initial three-year term with the possibility of two additional one-year renewal periods at the City Manager's sole discretion.

Pricing shall be submitted on a unit cost basis for all line items, with mobilization and demobilization established at a fixed $50,000 lump sum and all other items requiring unit pricing for measurement and payment purposes. For renewal periods, contractors may request fee adjustments with ninety days' notice supported by Consumer Price Index documentation, with maximum allowable increases limited to four percent. The contract is non-exclusive with no minimum work guarantee, and the City reserves the right to terminate at any time with thirty days' notice. No set-aside designations or disadvantaged enterprise restrictions are identified. Contractors must maintain comprehensive insurance coverage including Workers' Compensation, Commercial General Liability and Property Damage Insurance of at least $500,000 per person and $1,000,000 per occurrence, and Commercial Automobile Liability Insurance of $500,000, all naming the City as an additional insured. Respondents must provide three comparable project references and five similar project experiences within the past ten years, all required Florida State Contractor's Licenses and certifications, detailed resumes for project management personnel, organizational charts, equipment lists, and comprehensive safety plans. Contractors may subcontract up to fifty percent of work with a maximum ten percent administration and management markup.

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Text version

D. Sand Removal, Replacement and Changing

DynaSand® Filters require very particular characteristics for the sand used. Few sand suppliers can provide this type of sand. Specifically, the sand size and size distribution are important for the required degree of filtration. If it ever becomes necessary to change the sand in your filter, do not be tempted to use sand other than ones recommended by Parkson Corporation. See Section 3.2.G.9.

1. Sand can most easily be removed from the filter by letting the airlift pump do all the work. The filter should be kept full of water by running a hose into the top. A PVC pipe assembly should be made up, one end of which will fit into the top of the airlift. Use Schedule 40 1-1/4” pipe. One wrap of duct tape or electrical tape around the end that fits into the top of the airlift will make a good seal.

Figure 8 shows how to use this pipe.

To speed up sand pumping, an additional sand pump can be made up as in Figure 9. Tie a line around the pipe to prevent it from becoming buried too deeply in the sand.

If the sand is eventually to be replaced in the unit then pump it into bags or drums that can later be lifted to the top of the filter to re-install the sand. Remember that the airlift pump cannot pump much higher than the surface of the water, so keep the pipe assembly low. If you have multiple filters, sand can be pumped over into the other filters and then pumped back using their airlifts. It might be possible to pump sand back up to the filter using a rotary pump that keeps water moving quickly enough to keep the sand in suspension.

The hoses must be kept free of kinks. Diaphragm slurry pumps that work with concrete will not work with sand.

2. To replace sand in the unit, see Section 3.2.G

3-27 hkwag Line

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