DSHW-2024-008545

CORRECTIVE ACTION SECTION – SITE VISIT REPORT

SITE NAME: __ATK Promontory – SWMU 228 & GW Sampling_ DATE: _10___/__3___/__2024_____
EPA ID #: __UTD009081357__________________________ UTCA ID#: ______________________
LOCATION: __30 miles north of Brigham City, Box Elder County, Utah____________________________
PROJECT MANAGER: _Karen Wallner______________________________________________________
SITE STATUS
___ Active Investigation
___Ongoing Cleanup Activities
___Confirmation Sampling

_ _ Long-term Institutional Controls in-place [Site
Management Plan (SMP), Environmental
Covenant (EC), and/or Post Closure Plan (PCP)]
_X_ Long-term Groundwater Monitoring

OTHER (describe): Long term groundwater monitoring and soil sampling
PURPOSE OF SITE VISIT
_ _Drive-by (windshield survey)
_X_Sample Observation &/or Collection
___Site Investigation
___Cleanup Activities Inspection
___Confirm Current Land Usage
___ Confirm Cleanup Completed
___ Confirm Integrity of Engineering Controls
_ _ Confirm Compliance with SMP/EC
D2# for SMP/EC: DSHW- ________
___ Post-Closure Permit Verification
___ Document Change in Land Usage
OTHER (describe) Observe sample collection

FIELD OBSERVATIONS:

Soil samples were collected by hand auger at SWMU 228 for hexavalent chromium. Sample collection
was attempted at SWMU 401, but unsuccessful due to the presence of concrete in the ditch that could
not be broken apart with a sledgehammer. Northrop Grumman Systems Corporation will bring in a
concrete corer to access the soil beneath the concrete.

Groundwater samples were collected at groundwater monitoring wells D-6, C-1, and C-3 using a
Hydrasleeve SpeedBag sampler. Groundwater samples were collected for VOC and perchlorate analysis.
Samples for VOC analysis were always collected first; the samples for perchlorate analysis were collected
after. The Hydrasleeve samplers were lowered to 10 feet above the known depth of the wells (within a
20-foot screen) to collect the groundwater samples. Water level measurements are conducted
separately by a contractor prior to groundwater sampling. The water level data is available to the
sampler at the time of sampling.

SAMPLE COLLECTION
Were Environmental Samples Collected per the approved Sampling & Analysis Plan?
YES _X_ NO _ _ N/A ___
COMMENTS:
Groundwater samples were collected using a HydraSleeve sampler as described in Section 3.3.1 of the
Sampling and Analysis Plan.

Is the Work Being Performed in a Manner Consistent with the Approved Workplan(s)?
YES ___ NO ___ N/A _X_ Unknown (Drive-By Inspection Only) _ _
COMMENTS:

CURRENT LAND USAGE
___ Residential
_X_ Commercial
_X_ Industrial
___ Mixed Commercial w/ Residential
___ Under Construction &/or Development
___ Other: __________________________________
COMMENTS:
The site will be used for commercial/industrial production for the foreseeable future.

FUTURE LAND USAGE
___ Residential ___ Mixed Commercial w/ Residential
_X_ Commercial ___ Other: (describe below)
_X_ Industrial ___ Unknow at this time
COMMENTS:
The site will be used for commercial/industrial production for the foreseeable future.

POST-CLEANUP SITE VISITS
Is the Completed Cleanup Remedy Still Protective Based on Current Land Use?
YES _ _ NO ___ Unknown (Drive-By Inspection Only) ___
COMMENTS:
Site visit was conducted to observe soil and groundwater sampling.
LONG-TERM INSTITUTION CONTROL(S) VERIFICATION
Are Components or Restrictions of the SMP, EC &/or PCP Currently Being Complied with?
YES _ _ NO ___ Unknown (Drive-By Inspection Only) ___
COMMENTS:
Site visit was conducted to observe soil and groundwater sampling.
SITE VISIT CONCLUSIONS
Groundwater sampling appears to be conducted in accordance with the Sampling and Analysis Plan.

RECOMMENDATIONS

None.

ATTACHMENTS (PHOTOS, MAPS, FIGURES, TABLES, etc.) YES _ _ NO _X_ Photos were not allowed.
SIGNATURE: