WCD_MW-12S.pdf
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- Attached to
- Bldg 229 Demo Amendment 2
- Solicitation number
- W50S7126RA001
- Issued by
-
Department of the Army National Guard
About this file
This is a Record of Monitoring Well Construction documenting the installation of monitoring well MW-12S at Des Moines Air National Guard Base, Iowa. The well was installed on October 3, 2025, at 15:45 hours using sonic drilling methods by site geologist Zachary Spotts as part of a Remedial Investigation (RI) for PFAS contamination (Project No. 6332115-0215). The work was performed by EA Engineering, Science, and Technology, Inc.
The monitoring well specifications include a 2-inch diameter PVC riser extending 11 feet above ground surface with a 10-foot PVC screen (0.010-inch slot size) manufactured by Johnson Screens, extending from 11 feet to 21 feet below ground surface. The well incorporates a 16/30 clean sand filterpack (5 bags installed via metered pour method) from 9 to 21 feet below ground surface, with a bentonite seal (3 bags, WYO-BEN brand) positioned above the filterpack. The well bottom is located at 21 feet below ground surface. A concrete sloped pad with an MW Manhole protective casing (locked) provides surface protection. Depth to water was measured at 2.37 feet on October 7, 2025. Approximately 29 gallons of water were added to the borehole during drilling operations.
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Text version
RECORD OF MONITORING WELL CONSTRUCTION
(FLUSH MOUNT)
EA Engineering, Science, and
Technology, Inc.
Monitoring Well/Soil Boring ID No.:
MW-12S
Project Title/ Project No.: 6332115-0215 RI for PFAS at Des Moines ANGB, IA
Date/Time Installed: 10/03/25 1545 Time Finished: N/A
Location: Des Moines, IA Depth to Water: 2.37 ft on 10/07//25 Site Geologist: Zachary Spotts Drilling Method: Sonic
Riser Information Diameter: 2 inches Length: 11 feet Material: PVC Manufacturer: Johnson Screens
Seal Information Type: Bentonite Amount: 3 bags Manufacturer: WYO-BEN
Filterpack Information Type: 16/30 Clean Sand Amount: 5 bags Backfill method: Metered pour
Screen Information Diameter: 2 inches Length: 10 feet Slot Size: 0.010 inch Material: PVC Manufacturer: Johnson Screens Type of pipe joints: Threaded
Grout Information Type: N/A Amount: N/A Manufacturer: N/A
Top of riser
Top of screen (ft bgs): 11 feet
Top of filterpack (ft bgs): 9 feet
Top of seal (ft bgs): N/A
Bottom of well (ft bgs): 21 feet
Grass surface
Bottom of screen (ft bgs): 21 feet
Note: All features not to scale
Sloped pad Material: Concrete
Protective Casing Type: MW Manhole Lock? yes/no ags – Above Ground Surface bgs – Below Ground Surface
~ 29 gallons of water added to borehole during drilling
File details come from the government source that posted it. Updated .