SandWashingProcedure.pdf
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- 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 Request for Proposals (RFP No. 26-008UO-HK-RFP) issued by the City of Plant City, Florida for comprehensive sand and sludge management services at the Water Reclamation Facility located at 1500 Victoria Street. The scope of work includes mobilization and demobilization, pressure washing and cleaning of aeration basins, clarifiers, and digesters, 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. Services will be provided on an as-needed basis through individual work orders. Proposals must be submitted electronically through the City's e-Procurement Portal by March 26, 2026 at 2:00 p.m. local time, with a question submission deadline of March 16, 2026 at 5:00 p.m. The resulting contract will commence upon issuance for an initial three-year term with the possibility of two additional one-year renewal periods at the City Manager's sole discretion. Proposals shall not exceed fifteen pages and must include three comparable project references and five similar project experiences within the past ten years, detailed resumes for project management personnel, organizational charts, equipment lists, and comprehensive safety plans.
Pricing shall be firm for the initial contract term and 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 or delete portions of the contract at will. Contractors may subcontract up to fifty percent of work with a maximum ten percent administration and management markup. Evaluation criteria weight contractor qualifications at thirty percent, project team qualifications at thirty percent, work narrative and safety plan at twenty percent, and cost evaluation at twenty percent. 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 with primary coverage. No set-aside designations, disadvantaged enterprise restrictions, or incumbent vendor information has been identified. The specific total contract value or budget range is not disclosed; costs will be based on actual work performed as verified by the City and documented through certified weight tickets, flow meter readings, and approved testing procedures.
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Text version
H Sand Washing Procedure
New sand has a certain amount of fine material that must be washed out before the filter is put in operation. Use the following procedure:
1. Check that all removable weir plates are out of the slot in the reject compartment.
2. Start a supply of clean water to the filter. It is essential that enough flow is supplied to provide the reject flow given in Section 3.4.C. Do not provide less than this amount for each filter. It may be possible to use the water, which the filter is intended to treat if the solids concentration is low, but clean potable water is preferable. The water may be supplied by hose to the top of the unit or through the feed piping.
3. Start the air supply to the airlift at the rate given in Section 3.4.B This will start pumping sand to the top of the airlift. If the airlift does not pump sand, see Section 3.7.C. The fine material will be cleaned from the sand by the reject water flow.
4. Sand washing will require at least 6 to 12 hours. Check that sand is being pumped and that water is running over the reject weir during this time. The sand will be clean when the reject water is no longer cloudy.
5. Some of the fine material will settle out in the reject compartment where it will build up. At the end of the sand washing procedure swirl the water around in the reject compartment by hand so that this material is carried out over the reject weir.
3.3 Pre-Startup Check
Before start-up the following components should be checked and tested separately.
The filter cannot be started up nor operated until ALL of the ancillary equipment is fully operational. All pumps handling feed, reject and filtrate flows must be up and running. The air supply must be connected. Any chemical pretreatment equipment should be on-line and a supply of chemicals should be available.
It is not possible to do a meaningful start-up unless the filter is fully configured for normal operation.
3-13 pmurphy Highlight
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