Skip to content
What's up, Spearfish? Thu, Nov 5

Civic

Public meetings

Updated

Coming up

Past six weeks

South Dakota's open meetings law

📍 Permitting records

See what's being built in and around Spearfish.

Building permits issued

Updated

Look up an address

How Spearfish is building, year by year

State environmental notices

Updated

All notices

Contested cases

All cases

Permit requests someone has formally challenged, decided after a hearing before a state board.

Spill reports

Updated

Spill map

Spills and leaks reported in the Black Hills.

  • Rapid City

    Broken Mercury Thermostat

    Mercury • Construction materials • Open

    Details
    Material
    Mercury
    Source
    Construction materials
    Responsible party
    Bill Barber

  • Oct 14, 2026 • Edgemont

    Fuel Tanker Roll Over

    Diesel #2 (850 gallons) • Fuel truck • Open

    Details
    Reported
    Oct 14, 2026
    Material
    Diesel #2 (850 gallons)
    Source
    Transport
    What it came from
    Fuel Tanker
    Cause
    Transportation Accident
    How it happened
    Fuel hauler accident
    Reached
    Land
    Where
    Hwy 18 near MM 2
    Responsible party
    Westco Coop
    Notes
    The fuel hauler rolled his semi and tanker. The tanker can hold 7,500 gallons of fuel. Westco Coop is to hire a consultant to do the cleanup. Soil type is gumbo.

    Case file

  • Sep 22, 2026 • Lead

    Coeur Wharf Hydraulic OIl Spill

    Hydraulic Oil (15 gallons) • Truck • Open

    Details
    Reported
    Sep 23, 2026
    Material
    Hydraulic Oil (15 gallons)
    Source
    Transport
    What it came from
    Haul Truck
    Cause
    Equipment Failure
    Reached
    Land
    Responsible party
    Coeur Wharf
    What was done
    Absorbents placed, when truck is moved contaminated soil will be scraped up and taken to Belle Fourche Landfill
    Notes
    release was onto hardpack gravel/soil road within the mine site **Quatity spilled updated from 30-50 to 15 gallons per conversation with Ms. Walter 10/5/26

    Case file

  • Sep 18, 2026 • Sturgis

    AST Overfill Sturgis Kickstart

    Diesel #2 - total released (1400 gallons); Diesel #2 - outside containment (126 gallons) • Above-ground tank • Open

    Details
    Reported
    Sep 21, 2026
    Material
    Diesel #2 - total released (1400 gallons); Diesel #2 - outside containment (126 gallons)
    Source
    AST
    What it came from
    bulk AST
    Cause
    Operational Error
    How it happened
    Overfill - wrong AST filled
    Reached
    Land
    Responsible party
    MG Oil
    What was done
    Hired AET. Pumped out product from within the secondary containment.
    Notes
    Plan to scrape up any contaminated soil.

    Case file

  • Sep 17, 2026 • Rapid City

    Circle K Gasoline spill

    Gasoline • Fuel tank • Open

    Details
    Material
    Gasoline
    Source
    Fuel tank
    What it came from
    Vehicle being refueled on a trailer
    How it happened
    leaked out of the bottom of a vehicle on a trailer
    Responsible party
    Circle K
    Cleaned up
    9/17/2026 & 9/18/2026
    Cleanup contractor
    ERTS
    Soil dug up
    No
    Kept to the spill area
    Yes

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Sep 8, 2026 • Rapid City

    Sanitation Truck Route Hydraulic Oil Spills

    Hydraulic oil • Truck • Closed

    Details
    Material
    Hydraulic oil
    Source
    Truck
    What it came from
    Sanitation truck
    How it happened
    Leaking sanitation truck released hydraulic oil along its route
    Where
    Westberry Drive to Westberry Hill/S Canyon Rd to Rapid City Landil
    Responsible party
    Kieffer Sanitation
    What was done
    Rapid City HAZMAT responded and placed Floor dry

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Sep 4, 2026 • Rapid City

    UST Removal Sinclair

    Gasoline • Underground tank • Closed

    Details
    Material
    Gasoline
    Source
    UST
    What it came from
    One 12,000-gallon UST, two 5,500-gallon USTs gasoline
    How it happened
    Petroleum contamination associated with historic use.
    Reached
    Land
    Where
    NE corner of the intersection of Cleaveland Street and Mount Rushmore Road
    Responsible party
    Jim Buchli
    Notes
    The event concerns the removal of three underground storage tanks from Rushmore Sinclair. American Engineering Testing was retained by the consultant.

    Case file

  • Sep 3, 2026 • Lead

    Coeur Wharf Hydraulic Line

    Hydraulic Oil (65 gallons) • Hydraulic line • Open

    Details
    Reported
    Sep 3, 2026
    Material
    Hydraulic Oil (65 gallons)
    Source
    Hydraulic line
    What it came from
    Truck
    Cause
    Equipment Failure
    How it happened
    Blown hose
    Reached
    Land
    Where
    44.351019, -103.850886
    Responsible party
    Coeur Wharf
    What was done
    Applied absorbent pads to pooled product. Removed contaminated soil and containerized.
    Notes
    The hydraulic oil spilled from a moving truck covering an area approximately two feet wide, 100 feet long. The soil is being stored in a container until it can be properly disposed at the Belle Fourche Landfill.

    Case file

  • Belle Fourche

    Hydraulic Oil A1 Forklift

    Hydraulic oil • Line • Open

    Details
    Material
    Hydraulic oil
    Source
    Line
    Responsible party
    A1 Forlifts

  • Aug 16, 2026 • Rapid City

    I90 Diesel Release

    Diesel (50 gallons) • Saddle tank • No further action

    Details
    Reported
    Aug 16, 2026
    Material
    Diesel (50 gallons)
    Source
    Transport
    What it came from
    Semi saddle tank
    Cause
    Transportation Accident
    How it happened
    Semi accident in heavy rains
    Reached
    Land, Water
    Waterway
    Drainage area
    Where
    I-90 Westbound @ MM 56 (near the Harley Davidson)
    Responsible party
    Pacific Express Inc
    What was done
    RC Hazmat placed booms and patched the saddle tank
    Notes
    There was significant rainfall at the time of the release and it flowed down the median and into the drainage, a sheen was seen on the water in the median and in the drainage downstream

    Case file

  • Aug 13, 2026 • Rapid City

    Black Hills Energy regulator transformer oil

    Transformer Oil (92 gallons) • Regulator • Open

    Details
    Reported
    Aug 13, 2026
    Material
    Transformer Oil (92 gallons)
    Source
    Fixed Facility
    What it came from
    Regulator at Black Hills Energy transformer storage yard
    Cause
    Other
    How it happened
    regulator tipped
    Reached
    Land
    Where
    409 Deadwood Avenue
    Responsible party
    Black Hills Energy
    Cleaned up
    08/13/2026
    Soil dug up
    No
    Kept to the spill area
    Yes

    Case file

  • Aug 12, 2026 • Belle Fourche

    ATP | Olson Property

    Diesel gasoline • Underground tank • Closed

    Details
    Reported
    Aug 12, 2026
    Material
    Diesel gasoline
    Source
    UST
    What it came from
    One - 560 gal gasoline UST, one - 250 gal diesel UST. Fac. ID 15-00073
    Reached
    Land
    Responsible party
    Michela Olson
    Notes
    Facility ID # 15-00073. No contaminated soils removed. One tank basin soil sample @ 12 ft below grade had a TPH-G of 16.3 ppm.

    2026.125.pdf2026.125_Aug2026_ATP Report.pdf

  • Aug 10, 2026 • Lead

    Paradise Gulch Ln Drilling Fluid Release

    Drilling mud • Drill rig • No further action

    Details
    Material
    Drilling mud
    Source
    Drill rig
    What it came from
    Drlling an exploration hole
    How it happened
    Pressure spike causing a fracture
    Where
    Paradise Gulch Ln
    Responsible party
    Dakota Gold Corp
    What was done
    Ceased drilling to assess
    Cleaned up
    08/10/2026
    Cleanup contractor
    Not Applicable

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Jul 21, 2026 • Ellsworth AFB

    Ellsworth Air Force Base Diesel Spill

    Diesel (50 gallons) • Above-ground tank • Open

    Details
    Reported
    Jul 29, 2026
    Material
    Diesel (50 gallons)
    Source
    AST
    What it came from
    Pallet broke causing the tank to leak
    Cause
    Equipment Failure
    How it happened
    Pallet broke
    Reached
    Land
    Where
    Bulk Fuel area
    Responsible party
    CMS Corp
    Notes
    The fuel was spilled into a secondary containment and was cleaned up using absorbents. The absorbents were placed in drums for disposal.
    Cleaned up
    21 July 2026
    Soil dug up
    No
    Kept to the spill area
    Yes

    Case file

  • Jul 14, 2026 • Arpan

    Hilderbrand Creek Culvert Petroleum and Beer Release

    Diesel • Saddle tank • Closed

    Details
    Material
    Diesel
    Source
    Saddle tank
    What it came from
    Both saddle tanks on semi
    How it happened
    Semi left the road damaging both saddle tanks
    Where
    Hilderbrand Creek Culvert on Highway 85
    Responsible party
    IDC Transport Inc
    What was done
    Preparation for truck removal is underway

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Jul 13, 2026 • Arpan

    Truck in culvert

    Diesel (15 gallons) • Saddle tank • Closed

    Details
    Reported
    Jul 13, 2026
    Material
    Diesel (15 gallons)
    Source
    Transport
    What it came from
    Saddle Tank
    Cause
    Transportation Accident
    How it happened
    Released from the vent in the saddle tank
    Reached
    Land, Water
    Waterway
    Hilderbrand Creek (dry at time of incident)
    Where
    Highway 85, mm 75; Hilderbrand Creek crossing
    Responsible party
    Overholt Trucking
    What was done
    Rapid City Hazmat Team responded to the incident. They pumped up pooled product and applied absorbent booms and pillows.

    Case file

  • Jun 9, 2026 • Rapid City

    ATP- Grandview Elementary

    Diesel • Underground tank • Open

    Details
    Reported
    Jul 21, 2026
    Material
    Diesel
    Source
    UST
    What it came from
    One - 3,000 gal diesel UST
    Reached
    Land
    Responsible party
    Rapid City School District 51-4
    Notes
    10 tons of contaminated soils removed. Tank basin soil samples@ 12 ft below grade had a TPH-D concentration of 6,810 ppm. This sample was obtained after 10 tons of impacted soil had been removed.

    Case file

  • Jun 3, 2026 • Lead

    SURF Transformer Oil Leak

    non-PCB Transformer Mineral Oil • Transformer • Open

    Details
    Reported
    Jun 11, 2026
    Material
    non-PCB Transformer Mineral Oil
    Source
    Fixed Facility
    What it came from
    Transformer
    Cause
    Equipment Failure
    How it happened
    Leak in Transformer
    Reached
    Within Facilities Only
    Responsible party
    Sanford Underground Research Facility
    What was done
    Hiring contractor to fix leak
    Cleaned up
    SPILL LOCATION (physical address, directions, distance to nearest intersection or landmark, etc.)
    Cleanup contractor
    MAILING ADDRESS

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Wasta

    Truck Fire - Cheyenne River

    Diesel • Saddle tank • No further action

    Details
    Material
    Diesel
    Source
    Saddle tank
    Responsible party
    Gracious Transportation Services Inc.

    Case file

  • Apr 7, 2026 • Rapid City

    Dahl Fine Arts mineral oil release

    Mineral Oil (non-PCB) (10 gallons) • Transformer • Closed

    Details
    Reported
    Apr 7, 2026
    Material
    Mineral Oil (non-PCB) (10 gallons)
    Source
    Fixed Facility
    What it came from
    Leaking transformer
    Cause
    Equipment Failure
    How it happened
    Leaked into base of transformer and onto asphalt
    Reached
    Land
    Where
    713 7th Street, Dahl Arts Center
    Responsible party
    Black Hills Energy
    Cleaned up
    04/13/2026
    Soil dug up
    yes
    Kept to the spill area
    yes

    Case file

  • Mar 24, 2026 • Hill City

    Diesel release from generator

    Diesel (40 gallons) • Generator tank • Closed

    Details
    Reported
    Mar 24, 2026
    Material
    Diesel (40 gallons)
    Source
    Generator tank
    What it came from
    generator
    Cause
    Equipment Failure
    Reached
    Land
    Where
    341 Main Street (Hill City Middle School)
    Responsible party
    Delta Dental
    Notes
    spill reached storm drain, AET responding

    Case file

  • Feb 20, 2026 • Wall

    Containment Wall Failure | Urea

    Urea (Dry Fertilizer) • Containment structure • Open

    Details
    Reported
    Feb 20, 2026
    Material
    Urea (Dry Fertilizer)
    Source
    Fixed Facility
    What it came from
    Flat Storage Containment
    Cause
    Other
    How it happened
    Flat storage container wall failed
    Reached
    Land
    Responsible party
    Dakota Mill and Grain
    What was done
    Contain spilled product with concrete barriers and tarp to protect product from environment. Scraping up as much loose product as possible.
    Cleaned up
    1n progress

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Feb 11, 2026 • Rapid City

    Unkown Diesel release

    Diesel (>50 gallons) • Unknown • Closed

    Details
    Reported
    Feb 11, 2026
    Material
    Diesel (>50 gallons)
    Source
    Other
    What it came from
    unknown
    Cause
    Unknown
    Where
    Campbell St. & Omaha St.
    Responsible party
    Unknown
    What was done
    Rapid City HazMat team placed absorbents which were swept up by street team for disposal at landfill
    Notes
    Citizen reported spill to emergency management, no information on incident that caused the release or RP. Release all on roadway, cleaned up by RC HazMat and street teams

    Case file

  • Jan 27, 2026 • Rapid City

    Magellan Terminal | AST Leak

    Diesel (500 gallons) • Above-ground tank • No further action

    Details
    Reported
    Jan 27, 2026
    Material
    Diesel (500 gallons)
    Source
    AST
    What it came from
    Magellan Terminal, Tank 24-3
    Cause
    Equipment Failure
    How it happened
    Bad seal.
    Reached
    Land
    Responsible party
    ONEOK
    What was done
    OSRO hired. Vac trucks pumping up pooled product. Will excavate contaminated soil as possible.
    Notes
    Need a certified Petroleum Release Remediator (CPRR) to review remediation activities. Collect soil samples post-excavation.

    Case file

  • Jan 21, 2026 • Rapid City

    Overblown Mag Chloride Tank Camp Rapid

    Magnesium Chloride (~150 gallons) • Transport tank • Closed

    Details
    Reported
    Jan 21, 2026
    Material
    Magnesium Chloride (~150 gallons)
    Source
    Transport
    What it came from
    Tank on transport truck
    Cause
    Natural Phenomenon
    How it happened
    Windblown tank
    Reached
    Land
    Waterway
    Storm Drain ->Lime Creek -> Rapid Creek (did not enter either water body)
    Where
    near Ardnt Drive
    Responsible party
    South Dakota Department of Military
    What was done
    Absorbents were used to attempt to recover released product.
    Notes
    Storm drain was blocked, effectively preventing the material from entering a nearby creek. The storm drain will need to be cleaned out - contaminated silt can be disposed at a permitted municipal solid waste landfill. Contact Waste Management Program 605.773.3153 for questions on disposal.
    Cleaned up
    1/21/2026
    Soil dug up
    No
    Kept to the spill area
    Yes

    Case file

  • Jan 20, 2026 • Belle Fourche

    Punctured Saddle Tank

    Diesel (125 gallons) • Saddle tank • Closed

    Details
    Reported
    Jan 22, 2026
    Material
    Diesel (125 gallons)
    Source
    Transport
    What it came from
    Saddle Tank
    Cause
    Transportation Accident, Unknown
    How it happened
    parked semi with punctured saddle tank leaked
    Reached
    Land
    Where
    Pine & Mill St.
    Responsible party
    Gunderson Farms
    What was done
    Sand/dirt and absorbent booms placed
    Notes
    RP is in contact with AET to organize cleanup efforts

    2026.007.pdf2026.007_ExcavationReport.pdf

  • Dec 20, 2025 • Lead

    Equipment Failure - Hyrdaulic Oil

    Hydraulic Oil (112 gallons) • Equipment • Closed

    Details
    Reported
    Dec 21, 2025
    Material
    Hydraulic Oil (112 gallons)
    Source
    Transport
    What it came from
    Loader
    Cause
    Equipment Failure
    How it happened
    pilot pressure filter failed
    Reached
    Land
    Responsible party
    Wharf Couer Resources
    What was done
    Contaminated soil was scraped up and containerized.
    Notes
    A soil sample was collected for waste characterization. Soil will be taken to the Belle Fourche Landfill.

    Case file

  • Dec 19, 2025 • Newell

    WAPA transformer oil

    non-PCB transformer oil (200 gallons) • Transformer • No further action

    Details
    Reported
    Dec 19, 2025
    Material
    non-PCB transformer oil (200 gallons)
    Source
    Fixed Facility
    Cause
    Unknown
    Reached
    Land
    Where
    Meade County Road 194
    Responsible party
    Western Area Power Administration
    What was done
    personnel mobilized for cleanup
    Notes
    Location initially reported as WAPA's New Underwood facility, corrected to Newell Substation
    Cleaned up
    Bega 12/20, not Comp/eted

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Dec 17, 2025 • Lead

    Diesel AST Overfill

    Diesel (50 gallons) • Above-ground tank • Closed

    Details
    Reported
    Dec 18, 2025
    Material
    Diesel (50 gallons)
    Source
    AST
    What it came from
    AST had faulty gauge, overfill occurred
    How it happened
    Overfill
    Reached
    Land
    Where
    10928 Wharf Road
    Responsible party
    Coeur Wharf
    What was done
    Absorbents placed and vacuumed up. Waiting to be taken to Belle Fourche Landfill
    Notes
    At time of reporting spill was already cleaned up. Contaminated absorbents and soil will be taken to Belle Fourche Landfill after soil characterization sample results are received.

    Case file

  • Dec 15, 2025 • Spearfish

    Yesway Store 1191 Overfill UPS

    Gasoline • Dispenser • No further action

    Details
    Reported
    Dec 18, 2025
    Material
    Gasoline
    Source
    UST
    What it came from
    Dispenser
    Cause
    Operational Error
    How it happened
    Overfill
    Reached
    Land
    Responsible party
    United Parcel Service
    What was done
    A customer reported the spill to Yesway staff at 9:11 PM. Local fire department was notified at 9:37 by Yesway staff. Floor Dry was applied.
    Notes
    Spill occurred in front of pumps 4 and 6 and spread down the drive. The spill also ran into the grass and dirt between Yesway and Signature Auto.

    Case file

  • Dec 5, 2025 • Deadwood

    AST at Gilt Edge Mine

    fuel and motor oil • Above-ground tank • Closed

    Details
    Reported
    Dec 5, 2025
    Material
    fuel and motor oil
    Source
    AST
    What it came from
    One used oil tank, one 1000-gallon gasoline tank, one 4000-gallon dyed diesel fuel, one 500 gallon highway fuel
    Cause
    Other
    How it happened
    Petroleum contamination associated with historic use
    Reached
    Land
    Responsible party
    Gilt Edge Mine Superfund Site
    Notes
    This event involved the removal of four above ground storage tanks from the Glint Edge Mine. GeoTek Engineering was retained as the consultant on this project. The tanks were removed prior to the sampling GeoTek performed on October 29, 2025. Contamination below the SD DANR action levels was encountered.

    Case file

  • Nov 20, 2025 • Rapid City

    UST Removal Johnson Siding General Store

    Petroleum Hydrocarbon Products • Underground tank • Open

    Details
    Reported
    Nov 20, 2025
    Material
    Petroleum Hydrocarbon Products
    Source
    UST
    What it came from
    Underground Storage Tank (UST) System(s)
    How it happened
    Likely associated with the operation of multiple UST systems from at least 1978 until 2025
    Reached
    Land
    Waterway
    None directly; The flowpath of Rapid Creek almost encircles the site and ranges in distance from 420 feet to the west, 450 feet to the north, and 900 feet to the east
    Where
    12300 West Highway 44 (Johnson Siding General Store)
    Responsible party
    Stelmach Oil Inc
    What was done
    Three USTs (1 x 2k gal, 2 x 1k gal), product piping, and dispensers were removed; Approximately 7 tons of impacted soils were excavated from underneath the dispensers and transported to the Rapid City Landfill for proper disposal (October 13, 2025)
    Notes
    During removal activities, 13 soil samples were collected, screened with a PID, and subsequently submitted for laboratory analyses. Laboratory analytical results indicated measurable petroleum hydrocarbon concentrations in three soil samples collected from underneath the dispensers. Of these, two soil samples exceeded DANR Tier 1 Trigger Levels for Soils (2970 ppm TPH-D, 836 ppm TPH-G). Petroleum impacts appear localized beneath the dispensers. Groundwater was not encountered. Rapid Creek surrounds the site in all directions except south, ranging from 420 feet to the west, 450 feet to the north, and 900 feet to the west. [See AET Report No. P-0047712]
    Cleanup contractor
    ) LeWtOn TrUcng A∈T

    2025.171.pdf2025.171_RBCAEvalSiteAssWrkPlan.pdf2025.171_2026Apr_Tier 2 Report.pdf2025.171_RBCA_ReceptorSurvey&WorkPlan.pdf

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Oct 29, 2025 • Lead

    Drilling water release into creek

    Drilling Water/mud (15 gallons) • Drill rig • Closed

    Details
    Reported
    Oct 29, 2025
    Material
    Drilling Water/mud (15 gallons)
    Source
    Fixed Facility
    What it came from
    Exploration drill rig
    Cause
    Unknown
    Reached
    Water
    Waterway
    Burno Gulch
    Responsible party
    Dakota Gold
    Cleaned up
    10/29/2025
    Cleanup contractor
    Not Applicable

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Oct 29, 2025 • Rapid City

    Ice Melt release

    Ice B' Gone (magnesium chloride) (1500 gallons) • Above-ground tank • Open

    Details
    Reported
    Oct 29, 2025
    Material
    Ice B' Gone (magnesium chloride) (1500 gallons)
    Source
    AST
    Cause
    Operational Error
    How it happened
    Valve left open
    Reached
    Land
    Where
    44.078522, -103.206594
    Responsible party
    City of Rapid City
    What was done
    Sand was applied to the released liquid to contain and prevent it from reaching any storm drains.
    Notes
    The contaminated sand was scraped up with the intention to be used in the winter for its original intended purpose.
    Cleaned up
    10-29-25
    Soil dug up
    NO
    Kept to the spill area
    YES

    Case file

  • Rapid City

    UST Removal Flying J Rapid City

    Petroleum • Underground tank • No further action

    Details
    Material
    Petroleum
    Source
    Underground tank
    What it came from
    Underground storage tank (UST) system(s)
    How it happened
    The operation of multiple UST systems from at least 1963 until 2025
    Where
    Flying J, 4200 North Interstate 90 Service Road (Exit 61)
    Responsible party
    MG Oil Company
    What was done
    Phased removal of eight (1 x 4k gal, 3 x 12k gal, and 4 x 20k gal) USTs, product piping, and dispensers; Excavation and proper disposal 1,710 tons of contaminated soils (During May, June, and July 2025)
    Notes
    During removal activies, 34 soil samples were collected, screened with a PID, and subsequently submitted for laboratory analyses. Laboratory analytical results indicated all but one sample contained measurable concentrations of petroleum hydrocarbons. Of these, 22 samples exceeded DANR Tier 1 Trigger and/or Action Levels for Soils, with several exceeding by a substantial margin. In addition, the subsurface water present in two tank basin excavations K COMMENTS was overlain by thin layer of free

    2025.152.pdf2025.152_UST Removal Report.pdf2025.152_RBCARecEvalSiteAssWrkPlan.pdf2025.152_Tier2_Assessment_2026.pdf

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Sep 21, 2025 • Lead

    Wharf Dilute Process Solution line hit

    Dilute (Cyanide) Process Solution (360 gallons) • Line • Closed

    Details
    Reported
    Sep 22, 2025
    Material
    Dilute (Cyanide) Process Solution (360 gallons)
    Source
    Fixed Facility
    What it came from
    damaged line
    Cause
    Other
    How it happened
    damaged line
    Reached
    Land
    Responsible party
    Wharf Resources
    What was done
    scraped up gravel and placed in process
    Notes
    cleanup completed at time of call, samples taken

    Case file

  • Sep 10, 2025 • Rapid City

    Historic Fire Training - Rapid City Fire

    Perflourinated Compounds; associated with AFFF Use • Historical • Open

    Details
    Reported
    Sep 10, 2025
    Material
    Perflourinated Compounds; associated with AFFF Use
    Source
    Other
    What it came from
    Firefighting Training, Storage and Run Off
    Cause
    Unknown
    How it happened
    Firefighting Training, Storage and Run Off of AFFF Foam
    Reached
    Land, Water, Groundwater
    Responsible party
    City of Rapid City
    Notes
    The U.S. Army National Guard (USARNG) sampled several wells and streams and identified perfluorinated compounds both upgradient and cross-gradient of their activities, in the direction of possible firefighting testing sites operated by the Rapid City Fire Department. The USARNG is currently completing its sampling as part of a Remedial Investigation, with the final report expected in early 2026.

    Case file

  • Lead

    Lead Dakotamart Phase 2 ESA

    used oil or gasoline • Underground tank • No further action

    Details
    Material
    used oil or gasoline
    Source
    UST, Railway, Other
    What it came from
    Historical automotive service/fueling stations, scrapeyard and railroad. Not clear where contamination originated
    Cause
    Unknown
    How it happened
    Former tank systems and automotive service processes likely contributed to contamination
    Reached
    Land
    Where
    103 Glendale Drive
    Responsible party
    Lynn's Dakotamart
    What was done
    Phase I and II ESA completed at the site to determine extent of contamination
    Notes
    Phase I and II ESA completed prior to potential purchase of the property. Low levels of historical contamination found, and following review, NFA designation assigned to file.

    2025.126.pdf2025.126_Phase II ESA.pdf

  • Custer

    Custer Dakotamart Phase 2 ESA

    used oil or gasoline • Underground tank • No further action

    Details
    Material
    used oil or gasoline
    Source
    UST
    What it came from
    Multiple historical service/fueling stations on the property
    Cause
    Unknown
    How it happened
    Former tank systems or service processes likely responsible for contamination
    Reached
    Land, Water
    Waterway
    groundwater
    Where
    844 Mt Rushmore Road
    Responsible party
    Lynns Dakotamart
    What was done
    Phase I and II ESA completed at the site to determine extent of contamination
    Notes
    Phase I and II ESA completed prior to potential purchase of the property. Very low levels of historical contamination found, and following review, NFA designation assigned to file.

    2025.125.pdf2025.125_Phase II ESA.pdf

  • Lead

    Wharf - Acetic Acid

    Acetic acid • Hose • Closed

    Details
    Material
    Acetic acid
    Source
    Hose
    What it came from
    Regulated Tank Facility: Tank Facility ID #
    Where
    Survey Description
    Responsible party
    Buckley Powder
    What was done
    .K DEIFITON Responding Agency: DANR Local Discharger Federal EPA Other
    Notes
    cleanupcompletedattimeofreporting,waitingondocumentationforclosure

    Case file

  • Sep 8, 2025 • Hot Springs

    Phase II Hot Springs Dakotamart

    unknown • Underground tank • Closed

    Details
    Reported
    Sep 8, 2025
    Material
    unknown
    Source
    Other
    What it came from
    Historical contamination
    Cause
    Unknown
    How it happened
    Historical contamination
    Reached
    Land
    Where
    445 S Chicago Street
    Responsible party
    Lynn's Dakotamart
    Notes
    Phase II ESA conducted prior to potential purchase of the property, very low levels of contamination found, DANR assigning closure to file.

    Case file

  • Aug 5, 2025 • Rapid City

    ATP - Butler Machinery

    Diesel • Underground tank • Closed

    Details
    Reported
    Oct 2, 2025
    Material
    Diesel
    Source
    UST
    What it came from
    One - 5,000 gal diesel UST
    Reached
    Land
    Responsible party
    Butler Machinery Co
    Notes
    No contaminated soils removed. Tank basin soil samples @ 9 ft below grade had TPH-D concentrations ranging from 10.3 to 17.4 ppm.

    Case file

  • Jul 26, 2025 • Sturgis

    Overfilled RV at Yesway

    Diesel Fuel (<25 gallons) • Truck tank • Closed

    Details
    Reported
    Jul 28, 2025
    Material
    Diesel Fuel (<25 gallons)
    Source
    UST
    What it came from
    Customer overfilled RV tank
    How it happened
    RV tank overfilled when a fuel nozzle automatic shutoff valve failed to activate
    Reached
    Land
    Waterway
    Storm sewer that drains into Bear Butte Creek
    Where
    Yesway #1193 at 2350 Lazelle Street
    Responsible party
    Yesway #1193
    What was done
    Fire department was reportedly called
    Notes
    A customer overfilled their RV tank when a fuel nozzle automatic shutoff valve failed to activate, resulting in a small surface release that migrated east into a downgradient storm drain. The responding fire department reportedly applied absorbent material. Information indicating the location of the storm sewer outlet was not readily available.

    Case file

  • Jul 21, 2025 • Rapid City

    Rapid Valley Roads

    chip seal oil • Transport tank • No further action

    Details
    Reported
    Jul 22, 2025
    Material
    chip seal oil
    Source
    Highway
    Cause
    Other
    Where
    multiple roads in Rapid Valley
    Responsible party
    Bituminous Paving
    Notes
    Some spots and it is still sticky and not fully set - Was applied Friday and Saturday Ennen Road is the worst one - Pennington County (pic with person wearing hi-vis, tree pic and camper pic) Tinton Road District is also bad - Road District

    Case file

  • Jul 12, 2025 • Hill City

    Sheridan Lake Boat Fire

    Petroleum • Boat • Closed

    Details
    Reported
    Jul 12, 2015
    Material
    Petroleum
    Source
    Boat
    What it came from
    Mechanical Failure - Engine Fire
    Cause
    Equipment Failure
    How it happened
    Fire from Engine failure
    Reached
    Water
    Waterway
    Sheridan Lake
    Where
    Sheridan Lake North Boat Ramp
    Responsible party
    Dustin Born
    What was done
    fire out - absorbents put on sheen
    Notes
    Class A foam utilized to extinguish fire

    Case file

  • Jul 10, 2025 • Hill City

    Road Oil into Sheridan Lake

    Road oil • Sprayer • Open

    Details
    Reported
    Jul 10, 2025
    Material
    Road oil
    Source
    Highway
    What it came from
    newly applied road tar washed off by heavy precipitation event
    Cause
    Natural Phenomenon
    How it happened
    newly applied road tar washed off by heavy precipitation event
    Reached
    Land, Water
    Waterway
    Sheridan Lake
    Where
    Highway 385 alogn Sheridan Lake near docks
    Responsible party
    Oftedahl Construction
    What was done
    Deployed booms, used absorbent pads, applied sand.
    Notes
    AET assisting with cleanup effort

    Case file

  • Jul 2, 2025 • Hot Springs

    Diesel Spill at the VA

    Diesel Fuel (216 gallons) • Above-ground tank • Closed

    Details
    Reported
    Jul 2, 2025
    Material
    Diesel Fuel (216 gallons)
    Source
    AST
    What it came from
    overfill
    Cause
    Operational Error
    How it happened
    overfill
    Reached
    Within Facilities Only
    Where
    Boiler Plant Building #18
    Responsible party
    Hot Springs VA Medical Center
    Notes
    Overfill into concrete secondary containment
    Cleaned up
    07-02-2025
    Cleanup contractor
    N/A.
    Soil dug up
    No.
    Kept to the spill area
    Yes.

    Case file

  • Jun 24, 2025 • Lead

    CN Spill

    Cyanide (5 gallons) • Above-ground tank • Closed

    Details
    Reported
    Jun 24, 2025
    Material
    Cyanide (5 gallons)
    Source
    AST
    What it came from
    tank leak
    Cause
    Equipment Failure
    How it happened
    tank leak
    Reached
    Within Facilities Only
    Responsible party
    Coeur Wharf

    Case file

  • Jun 16, 2025 • Lead

    Grizzly Gulch Seepage Water Release

    Seepage Water (Heavy Metals) • Pump • No further action

    Details
    Reported
    Jun 16, 2025
    Material
    Seepage Water (Heavy Metals)
    Source
    Pipeline
    What it came from
    seepage pump line
    Cause
    Equipment Failure
    How it happened
    Failure of expansion joint between seepage pump and piping resulted in water sprayed up into pump building.
    Reached
    Land, Water, Groundwater
    Waterway
    Grizzly Gulch Creek
    Where
    Grizzly Gulch Pump House
    Responsible party
    Homestake Mining Company/Barrick
    What was done
    Will scrape up affected road (visible red streak)
    Notes
    Water seeped out of the pump building down the road into Grizzly Gulch Creek. Will collect surface water samples above the first check dam and another near the 3rd check dam and collect groundwater samples monthly (MW4).

    Case file

  • Jun 9, 2025 • Wall

    ATP | Wall DOT Shop

    Diesel, gasoline • Underground tank • Open

    Details
    Reported
    Jul 20, 2026
    Material
    Diesel, gasoline
    Source
    UST
    What it came from
    One - 2,000 gal diesel UST and One - 1,000 gal gasoline UST
    Reached
    Land
    Responsible party
    SD Department of Transportation
    Notes
    Facility ID # 02-00247. 6 tons of contaminated soils removed. Tank basin soil samples @ 8 ft below grade had petroleum concentration below detectable limits. Sample below removed dispensers had a TPH-D concentration of 1,470 ppm.

    Case file

  • Jun 9, 2025 • Custer

    ATP Custer DOT Shop

    Diesel, gasoline • Underground tank • Closed

    Details
    Reported
    Oct 3, 2025
    Material
    Diesel, gasoline
    Source
    UST
    What it came from
    One - 2,000 gal diesel UST and One - 2,000 gal gasoline UST
    Reached
    Land
    Responsible party
    SD Department of Transportation
    Notes
    No contaminated soils removed. Tank basin soil samples @ 9 ft below grade had petroleum concentration below detectable limits. Sample below removed diesel dispenser had a TPH-D concentration of 41.5 ppm.

    2025.146.pdf2025.146_ATP Removal Report.pdf

  • Jun 6, 2025 • Deadwood

    Carribean Blue Water/Dye

    Unknown blue substance • Containers • No further action

    Details
    Reported
    Jun 6, 2025
    Material
    Unknown blue substance
    Source
    Other
    What it came from
    Big D dumpster and Kieffer Sanitation garbage truck
    Cause
    Other
    How it happened
    Unknown blue substance put in trash at Big D. Kieffer Sanitation pickup up the garbage which leaked out of the garbage truck and was spread on streets throughout town.
    Reached
    Land, Water
    Waterway
    whitewood creek
    Where
    Streets throughout town
    Responsible party
    Unknown
    What was done
    City performed cleanup with floor dry but blue color remained. Following rainfall event which dyed the creek blye, the city reported to DANR.
    Notes
    DANR retained an environmental consultant to visit the site, obtain a sample, perform limited investigations,and determine if cleanup was possible.

    2025.073_AETworkplanSigned.pdf2025.073_photos.pdf2025.073.pdf2025.073_report.pdf

  • Jun 6, 2025 • Deadwood

    Salt on Highway

    Salt (23 ton) • Transport trailer • Open

    Details
    Reported
    Jun 13, 2025
    Material
    Salt (23 ton)
    Source
    Transport
    What it came from
    Belly dump truck
    Cause
    Other
    How it happened
    Operator Error
    Reached
    Land
    Where
    Highway 14A, near mm 39.8
    Responsible party
    RMP Trucking LLP
    What was done
    SD DOT moved salt off the road and then loaded it into a side dump. They took the salt back to their shop to use for its intended purpose (de-icing, anti-slip on roads)

    Case file

  • May 16, 2025 • Hill City

    Rafter J Bar Ranch Campground

    Gasoline • Underground tank • Closed

    Details
    Reported
    May 16, 2025
    Material
    Gasoline
    Source
    UST
    What it came from
    two 6,000-gallon UST with two dispensers, for gasoline
    Cause
    Unknown
    How it happened
    contamination encountered during tank removal
    Reached
    Land
    Responsible party
    Rafter J Bar Ranch Campground Sam Ferebee
    What was done
    Tank system removed and contaminated soil properly disposed of on April 1, 2025.
    Notes
    During removal of system, some petroleum contamination was identified. Over 6 tons of contaminated soil was removed and disposed of. Remaining soils were tested for contamination and analytical results indicated non-detect levels on petroleum constituents.

    2025.060.pdf2025.060_ USTSystemRemoval.pdf

  • Apr 28, 2025 • Burdock

    Barker Dome Spill - Btwn Ozark 1 & Ozark 3

    Crude oil (10? barrels) • Above-ground tank • No further action

    Details
    Reported
    Apr 28, 2025
    Material
    Crude oil (10? barrels)
    Source
    AST
    What it came from
    leak from pipe
    Cause
    Equipment Failure
    How it happened
    leak from pipe
    Reached
    Land
    Responsible party
    Thomas L. Sunde
    Notes
    Off of Highway 89, south of Pringle and west of Hot Springs, you go west on Pilger Mountain Road for approximately 9.3 miles. Then there is an unmarked two-track road which you take for approximately 1.3 miles to reach the Barker Dome tank battery. This unmarked two-track road does show up on Google Maps as the Barker Dome RdŽ.

    2025.044_MemoApprovingRSwork.pdf2025.044_SignedAETProposal.pdf2025.044_report.pdf2025.044_invoice.pdf2025.044.pdf2025.044_ChangeOrder.pdf

  • Apr 7, 2025 • Nisland

    ATP - Williams Parker Residence

    Fuel oil • Underground tank • Closed

    Details
    Reported
    May 5, 2025
    Material
    Fuel oil
    Source
    UST
    What it came from
    One - 500 gal fuel oil UST
    Reached
    Land
    Responsible party
    Williams-Parker
    Notes
    No contaminated soils removed. One tank basin soil sample @ 6 ft below grade had a TPH-D concentration of 110 ppm.

    Case file

  • Mar 27, 2025 • Summerset

    PMI West - Bleach solution

    Sodium hydroxide • Tote • Closed

    Details
    Material
    Sodium hydroxide
    Source
    Tote
    What it came from
    Tote
    How it happened
    Valve failure
    Responsible party
    PMI West
    What was done
    Release impacted gravel/soil lot outside of the building.
    Notes
    The solution has a pH of 12.5. The contaminated soil will need to be excavated and properly disposed. X COMMENTS

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Mar 21, 2025 • Lead

    Wharf Mine - Engine oil spill on road

    Engine Oil/Motor Oil (50 gallons) • Truck • Closed

    Details
    Reported
    Mar 21, 2025
    Material
    Engine Oil/Motor Oil (50 gallons)
    Source
    Transport
    What it came from
    Haul truck engine failure
    Cause
    Transportation Accident
    How it happened
    Spilled on road at Wharf
    Reached
    Land
    Responsible party
    Wharf Resources Inc.
    Cleaned up
    3/21/2025
    Soil dug up
    Yes
    Kept to the spill area
    Yes

    Case file

  • Mar 5, 2025 • Ellsworth AFB

    Hydraulic Oil Release - EAFB

    Hydraulic Oil (39 gallons) • Hydraulic line • Closed

    Details
    Reported
    Mar 5, 2025
    Material
    Hydraulic Oil (39 gallons)
    Source
    Other
    What it came from
    Skid Steer hydraulic line
    Cause
    Equipment Failure
    How it happened
    blown line
    Reached
    Land
    Where
    44.137998, -103.094871
    Responsible party
    Ellsworth Air Force Base - EAFB
    What was done
    Absorbents were applied, bagged up and taken to Hazmar for disposal.
    Notes
    The release was contained to the concrete runway. No soil or waterways were impacted.
    Cleaned up
    05/03/2025
    Soil dug up
    No
    Kept to the spill area
    Yes

    Case file

  • Mar 1, 2025 • Rapid City

    Semi Hanging off Overpass

    Diesel (100 gallons) • Saddle tank • Open

    Details
    Reported
    Mar 31, 2025
    Material
    Diesel (100 gallons)
    Source
    Transport
    What it came from
    Saddle Tank
    Cause
    Transportation Accident
    How it happened
    Saddle tank was punctured during removal of semi cab hanging off the overpass
    Reached
    Land
    Where
    I-90 East, Exit 58
    Responsible party
    AAA Logistics Group
    What was done
    Rapid City Hazmat team responded. Absorbents were placed below the saddle tank to try to absorb as much of the released product as possible.

    Case file

  • Feb 28, 2025 • Lead

    Compressor Oil - Yates Compressor House

    Compressor Oil (est. <25 gallons) • Equipment • Open

    Details
    Reported
    Feb 28, 2025
    Material
    Compressor Oil (est. <25 gallons)
    Source
    Fixed Facility
    What it came from
    Historic Compressors associated with Homestake Mine
    Cause
    Equipment Failure
    How it happened
    Slow leaks over time.
    Reached
    Within Facilities Only
    Responsible party
    Sanford Underground Research Facility
    What was done
    Will evaluate amount of remaining oil. Will pump out and recycle remaining oil. Will clean up concrete with absorbents and properly dispose of absorbents.
    Notes
    The assessment and cleanup will take place through three separate work orders beginning in April 2025 with a tentative end in June 2025.
    Cleaned up
    05/30/25-08/06/25
    Soil dug up
    No
    Kept to the spill area
    Yes

    Case file

  • Feb 25, 2025 • Lead

    Wharf - Treated Water

    Contaminated water (arsenic) (~6,000 gallons) • Line • Closed

    Details
    Reported
    Feb 26, 2025
    Material
    Contaminated water (arsenic) (~6,000 gallons)
    Source
    Other
    What it came from
    water treatment line
    Cause
    Equipment Failure
    How it happened
    Failed valve
    Reached
    Land, Groundwater
    Responsible party
    Wharf Resources Inc.
    What was done
    Failed valve caused water to surface. The line was shut off and the water seeped back down into the ground.
    Notes
    A water sample was collected from the pooled product and will be analyzed for nitrates and arsenic.

    Case file

  • Feb 10, 2025 • Wall

    Wall DMG Roundup Spill

    Glyphosate (Roundup) (90 gallons) • Tote • Closed

    Details
    Reported
    Mar 10, 2026
    Material
    Glyphosate (Roundup) (90 gallons)
    Source
    Fixed Facility
    What it came from
    Shuttle Tote
    Cause
    Equipment Failure
    How it happened
    Shuttle tote failed
    Reached
    Within Facilities Only
    Responsible party
    Dakota Mill and Grain
    What was done
    Spilled product was contained to the loading pad. Floor dry was applied to contain spilled product. Sump pump used to pump up product.
    Notes
    Absorbents or dirt to be used to absorb remaining product that cannot be recovered via pump.
    Cleaned up
    3-13-26
    Cleanup contractor
    MAILING ADDRESS

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Ellsworth AFB

    Ellsworth AFB Hydraulic Oil Release

    Hydraulic oil • Unknown(See case file) • Closed

    Details
    Material
    Hydraulic oil
    Source
    Unknown(See case file)
    What it came from
    Unknown
    Where
    721 Kenny Road
    Responsible party
    AERO Simulation Inc
    Cleaned up
    April 9, 2025
    Cleanup contractor
    American Engineering Testing
    Soil dug up
    YES
    Kept to the spill area
    YES

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Jan 23, 2025 • Ellsworth AFB

    Diesel Overfill Ellsworth Air force Base

    Diesel • Truck tank • Closed

    Details
    Material
    Diesel
    Source
    Truck tank
    Where
    & LOCATION
    Responsible party
    CORRAY
    What was done
    placed absorbents and pooled liquid pumped into drum
    Cleaned up
    01/25/2025
    Soil dug up
    No
    Kept to the spill area
    Yes

    Case file

    Some of this was read from a scanned form by computer and may have mistakes; the case file has the original.

  • Jan 19, 2025 • Hot Springs

    Semi vs Sedan - Diesel Release

    Diesel (75 gallons) • Saddle tank • Open

    Details
    Reported
    Jan 19, 2025
    Material
    Diesel (75 gallons)
    Source
    Transport
    What it came from
    Saddle Tanks
    Cause
    Transportation Accident
    How it happened
    2 vehicle collision.
    Reached
    Land
    Where
    approx: 13066 Fall River Road, 43.413341, -103.447083
    Responsible party
    New Prime Inc.
    What was done
    Granular absorbent was put down by first responders. The DOT was planning on putting down sand on the road for remaining contamination.
    Notes
    Sweeper out of Edgemont was planning on picking up the absorbents on the road.
    Cleaned up
    TBD
    Cleanup contractor
    Environmental Works, Inc
    Soil dug up
    TBD

    2025.007_Remedial Exacation Report.pdf2025.007.pdf

  • Sep 24, 2024 • Tilford

    Diesel release - Tilford POE

    Diesel (~40 gallons) • Transport truck • Closed

    Details
    Reported
    Nov 4, 2025
    Material
    Diesel (~40 gallons)
    Source
    Transport
    What it came from
    Transport truck/semi
    Cause
    Operational Error, Other
    How it happened
    Leak repair resulted in accidental release
    Reached
    Land
    Where
    C-Express, 1202 8th Ave NE
    Responsible party
    Redfort Logistics Corp
    What was done
    Sturgis FD applied Floor Dry absorbents to the concrete. POE staff helped sweep up and recover used absorbents.
    Notes
    POE staff planned to put recovered absorbents in dumpster on site. Waste is delivered to the Rapid City Landfill for final disposal.

    Case file

Press releases