SandWashingProcedure.pdf

PDF 13 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 procedure document related to a Request for Proposals issued by the City of Plant City, Florida for sand and sludge management services at its Water Reclamation Facility. The document provides detailed sand washing procedures required before filter startup, including steps for removing fine materials through a six to twelve-hour washing process using clean water supply and air circulation. The RFP (No. 26-008UO-HK-RFP) seeks vendors to provide comprehensive maintenance services on an as-needed basis, including mobilization and demobilization, pressure washing of aeration basins and clarifiers, grit and sludge removal and hauling, sand media removal and replacement, and waste disposal. Proposals must be submitted electronically by March 26, 2026 at 2:00 p.m., with a question submission deadline of March 16, 2026. The contract will commence upon issuance for an initial three-year term with two optional one-year renewal periods at the City Manager's discretion.

Pricing shall be submitted on a unit cost basis for all line items except mobilization and demobilization, which is fixed at $50,000 lump sum, with actual payment based on certified weight tickets and approved testing procedures. The total contract value is not disclosed, and the contract is non-exclusive with no minimum work guarantee. Contractors must demonstrate Florida State Contractor's Licenses, provide three comparable project references and five similar project experiences within ten years, maintain insurance coverage of at least $500,000 per person and $1,000,000 per occurrence for general liability, and carry $500,000 in commercial automobile liability insurance. Evaluation criteria weight contractor qualifications at thirty percent, project team qualifications at thirty percent, work narrative and safety plan at twenty percent, and cost at twenty percent. Contractors may subcontract up to fifty percent of work with a maximum ten percent administration markup. No set-aside designations or incumbent vendor information is identified in the solicitation documents.

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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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