NBSFS Water Tank Site Vist and QA.pdf
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- Attached to
- NBSFS Water Tank Maintenance
- Solicitation number
- FA283526Q0033
About this file
This is a Questions and Answers (Q&A) document for a federal water tank maintenance contract opportunity (FA283526Q0033) at Naval Base San Francisco (NBSFS). The solicitation has the following key dates: questions due September 4, answers due September 9, and RFP due September 17.
The contract requires comprehensive maintenance and cleaning of water storage tanks at two buildings (B107 and B135), with work beginning at B107. Primary scope includes cleaning three tanks at B135 containing 55,000, 20,000, and 55,000 gallons, replacement of two control valves and valve stems for Tank Chambers A and B, system pressure maintenance, and contractor-performed lockout/tagout procedures. The contractor must drain tanks, manage water discharge to a rock bed swale approximately 20 feet from B135, and refill from wells. Work is scheduled for approximately 2 weeks overall with 3 days required for cleaning, performed Monday through Friday, 7am to 3pm. The Period of Performance is 18 weeks. Additional requirements include Davis-Bacon Act compliance, contractor bonding, erosion control planning, state permit acquisition, pressure washing capability when tanks are empty, and removal of tank lids by the contractor (with base providing unlock access). Tank B107 measures 28 x 22 x 16 feet at full water level with no intake screen; only B135 contains a sump. Tank B135 includes two shutoff valves, a 350 GPM drain pump, and discharge located on the opposite side of the building. Bidders may submit proposals without attending the mandatory site visit.
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Text version
Question Answer Is this following the Davis Bacon Act? Yes
Detailed photos of the tanks, access points/manways, piping and valves, pump intake screens, and the surrounding work/access areas. See attached What is the Period of Performance? 18 weeks Bonded? Yes B107: dimmensions of the tank? 28 x 22 x 16 (at full water level) B107: screen intake? NO N/A
Is this all drinking water (potable) and fire supression? Yes Contractor to drain? Yes
Permits from state needed? How long does this take? Yes Will water available for pressure washing when tank is empty? Yes Provide the work hours. Monday - Friday; 7am -3pm (in PWS) What is the time required to clean? 3 days Time frame to complete work? roughly 2 weeks Is the discharge going in a drain or field? Field Is there schemmatics of piping etc? See attached Age of tanks? B135 1995, Is there a sump in each tank? Only in B135 What is the GPM on drain pump (B135)? 350 GPM Erosion control plan needed? Yes How will water be refilled? From wells B135: 2 shut off valves? Yes B135: amount of gallons on the 3 tanks? 55,000, 20,000 and 55,000 gallons B135: who removes the lids? To be performed by contractor. Base unlocks them.
B135: lock out? Tag out? Identify an on/off? All LO/TO to be performed by contractor.
Which building to start work on? B107 Maintain system pressue? Yes Stems included? Yes B135: discharge drain located on the other side of the building Dishcarge in into a rock bed swail about 20 feet away.
If we were not in attendance for the site visit, can bids still be submitted? Yes Please provide most recent inspection report See attached Please provide Drawings showing valve sizes and model information See attached
PWS Section 3.7 requires replacement of two valves, valve stems, and associated hardware controlling water to Building 135, Tank Chambers A and B.
Could you please provide the size, type, material, pressure rating, and connection configuration of the existing valves to be replaced See attached
Questions due: 4 Sept Answers due: 9 Sept
RFP due: 17 Sept
NBSFS Water Tank Maintenance FA283526Q0033
Q&A
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