RFI LOG Demo B1825 and B1839r3.pdf
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- Attached to
- Demolish Building 1825 and Building 1839
- Solicitation number
- MXRD220107-RFP
About this file
The document is a Request for Information (RFI) Log for a demolition project at Hanscom Air Force Base, dated 3-6 June 2025, addressing technical questions about demolishing Buildings 1825 and 1839. Key details include clarifications on utility removal, geothermal well decommissioning, and site-specific details. Significant questions and answers covered the 6-inch drain and water line removal, geothermal well removal requirements, project bonding (confirmed at 1% of total project cost), and specific site infrastructure details such as the location of a communication manhole and a concrete staircase.
Of particular note, the log provides detailed specifications for the geothermal well at Building 1825, drilled in September 1997. The well is a standing column, open-loop design with a total depth of 650 feet, 8-inch inner diameter steel casing, and located in medium gray rock. A pump test conducted in September 1997 showed a static water level 10 feet below land surface, with full drawdown to 650 feet after pumping at 40 gallons per minute for 1 hour. The geological formation includes pan material (0-5 feet), sand material (5-20 feet), clay material (20-30 feet), and medium grey rock (30-650 feet).
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RFI LOG – DEMO B1825 & B1839
3 June 2025
1. Q: Can the 6 “ inch drain be capped and abandoned instead of removed. To avoid breaking into the street ?
A: Drain to remain refer to updated plans : B-1825 Demo plan MXRD 22-0107 V2
2. Q: Same thing with the water line. Can it be turned off, capped and abandoned?
A: Nothing to be left abandoned
3. Q: On the statement of work under 5.2.2.1 it says “Geothermal well must be decommissioned by a MassDEP certified well driller” But under 5.2.2.2 it says “Contactor must follow all requirements regarding proper removal a geothermal well” Can the geothermal well be decommissioned and abandoned with having to removed. ? Section 5.2.2.1 and 5.2.2.2 kind of contradict each other.
A: The goal is to Completely remove the Geothermal well:
The Geothermal well shall be fully decommissioned and removed in accordance with all applicable Massachusetts Department of environmental Protection (MassDEP) regulations, and the work must be performed by a MassDEP-certified well driller.
4. Q: Does the bond equal to 1% of the total proposed project cost?
A: Yes.
5 June 2025
1. Q: I was unable to find the communication manhole "MH13D" during the site walk. Its specific location is called out on Sheet A-102 from "Attachment 9 B-1825 Demo Plan MXRD 22-0107 V2". Can the location of MH13D be confirmed?
A: Working on locating the manhole, this answer may result in a SOW addendum.
2. Q: The walkway located southeast of B1825 that runs from the parking lot to the woods has concrete staircase. Does the concrete staircase also need to be removed?
A: Yes, as marked on the demo plan A-107 : B-1825 Demo plan MXRD 22-0107 V2
3. Q: The plans do not appear to have a scale set for each page, can one be provided? When I calibrate the scale using the bar scale at the bottom, I am getting different quantities for each page on the same measurement (for example, when measuring the building area, I get 2400 SF on 1 page, but on another page I get
40,000 SF).
A: Follow the first layout A-100 for scaling, plans A-102 to A-109 (not to scale) modified to show work details without scale being adjusted.
4. Q:The grade lines do not seem to have the specific elevations they are associated with. Can those elevations be provided, or can the CAD plan set be provided?
A: Already provided all available information.
6 June 2025
1. Q: To complete my bid for the demolition of buildings 1825 & 1839, I need some as-built specs for the geothermal well that is to be removed. I need the depth and diameter of the well. Also, can you please let me know if it is a standing column well or a closed loop well design. Please advise. Thank you.
A: Answer listed below, Building 1825, Geothermal well.
Date: September/17/ 1997, Well use: Geothermal, Method drilled: Rotary
Type: Standing column, open loop.
The Geothermal well located at Building 1825, drilled using the rotary method in September 1997, has total depth of 650 feet, with bedrock encountered 30 feet. The well casing consists of schedule 40 steel with length of 40 feet and inner diameter of 8 inches, extending 10 feet to bedrock and sealed with a protective shoe. The well is located within medium gray rock, with identified water-bearing zones of depths of 300-305 feet, 345 to 350 feet, 635 to 640 feet.
Pump test conducted on September 22, 1997:
- A pump test recorded a static water level 10 feet below the land surface with a full drawdown to 650 feet achieved after pumping at 40 gallons per mins for 1 hour. Air measurements indicated 100% full recovery after 1hour 45 mins.
Formation encountered during drilling:
- Pan material from 0-5 feet, Sand material 5-20 feet, Clay material 20-3- feet, Medium grey rock 30-650 feet
File details come from the government source that posted it. Updated .