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Site Report: ARRC Mammoth Alaska


Site Name: ARRC Mammoth Alaska
Address: 1048 Whitney Rd., Anchorage, AK 99501
File Number: 2100.26.202
Hazard ID: 23887
Status: Active
Staff: Grant Lidren, 9072698685 grant.lidren@alaska.gov
Latitude: 61.224801
Longitude: -149.864036
Horizontal Datum:WGS84

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Problems/Comments

In 1990, contaminated soil was encountered when 5 underground storage tanks USTs were removed: tank 1 a 500-gallon Gasoline, Tank 2 a 2,000-gallon diesel, tank 3 a 300-gallon used oil tank, tank 4 a 1,000-gallon used oil tank, and tank 5 a 12,000-gallon diesel. Further site characterization activities indicate the soil and groundwater is contaminated with petroleum and chlorinated solvent contamination above ADEC migration to groundwater, groundwater, and vapor intrusion screening levels.

Action Information

Action Date Action Description DEC Staff
10/9/1990 Site Added to Database * Not Assigned
10/9/1990 Leaking Underground Storage Tank Release Confirmed - Petroleum ADEC recieved Mammoth of Alaska Mammoth Trucking UST Assessment Report dated December 1991, submitted by Northern testing labs. 5 USTs were removed with about 140 cubic yards of conaminated soil excavated and stockpiled during removal. GRO and BTEX was found in the soil, but extent of contamination was not determined. Halogenated solvents were not analyzed. LUST Site created in CSP for source area ID 77904 ADD; Waste oil, gasoline, diesel contaminants. Grant Lidren
10/10/1990 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; :LCAU Date changed DB conversion * Not Assigned
3/19/1993 Leaking Underground Storage Tank Corrective Action Underway LCAR; Reported on the remediation of 674 yards of soil. Department requests release investigation. * Not Assigned
6/14/1994 Update or Other Action Phase 1 and Phase 2 site assessments were performed in 1994. Six soil borings were sampled from depths between 4 to 25 ft. bgs. Four of the borings were converted into MWs: Mw-1, MW-2, MW-3, and MW-4. Surface soil was also analyzed. DRO, GRO, BTEX, and VOCs were found in the subsurface soil in the area of the former USTs. DRO, GRO, and VOCs were detected in GW upgradient and downgradient of the former UST area. MW-1 contained PCE at 0.0121 and MW-3 contained VC at 0.014. VOCs were also detected in the surface soil 200 ft. SE and upgradient of former USTS. Grant Lidren
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: MAMMOTH OF ALASKA, INC. * Not Assigned
12/17/1997 Update or Other Action Various ground water monitoring events from 1997-1998 contained PCE and indicate GW is flowing southwest. Grant Lidren
6/2/1998 Update or Other Action RP now AKRR, letter requesting gw monitoring, and RI & CA plans * Not Assigned
2/19/1999 Underground Storage Tank Site Characterization or Assessment ADEC received Former Mammoth Trucking Release Investigation Report dated February 1999, submitted by CH2MHILL. Nine soil borings were advanced-five were converted to MWs- and groundwater/soil samples were collected December 1, 1998. Soil samples collected contained DRO up to 4,000 mg/kg, GRO up to 410 mg/kg, benzene up to 0.25 mg/kg, PCE up to 0.18 mg/kg, methylene chloride up to 0.63 mg/kg, and TCE up to 0.1 mg/kg. Ground water samples collected contained DRO up to 36.6 mg/L, RRO up to 2.0 mg/L, PCE up to 0.032 mg/L, TCE up to 0.03 mg/L, vinyl chloride up to 0.025 mg/L, and benzene up to 0.0097 mg/L. Grant Lidren
8/6/1999 Update or Other Action ADEC deny alternative cleanup and request ongoing mw results by 9/10/99 * Not Assigned
11/2/1999 Underground Storage Tank Site Characterization or Assessment ADEC received Mammoth Groundwater Monitoring Results, dated October 28, 1999, submitted by CH2MHILL. Six groundwater samples collected August 18, 1999, contained DRO up to 93.2 mg/L, RRO up to 11.9 mg/L, PCE up to 0.044 mg/L, TCE up to 0.02 mg/L, vinyl chloride up to 0.016 mg/L, and benzene up to 0.0083 mg/L Grant Lidren
1/28/2004 Update or Other Action Transferred DEC staff lead from John Carnahan Cynthia Pring-Ham
2/11/2008 Exposure Tracking Model Ranking intial ranking completed Grant Lidren
2/11/2008 Update or Other Action Update latitude and longitude via SPAR Statewide Locater ArcReader Grant Lidren
10/1/2010 Report or Workplan Review - Other On this date, ADEC received Work Plan for Groundwater Monitoring Former Mammoth Trucking Facility, submitted by Clarus, date September 22, 2010. The five onsite MWs (MW-1, CHMWE1, CHMWE2, CHMWE4, & CHMWE) will be sampled for GRO, DRO, RRO, BTEX, and VOCs. Grant Lidren
12/14/2010 Update or Other Action On this date, ADEC received Groundwater Monitoring Report Former Mammoth Trucking Facility, submitted by Clarus, dated December 10, 2010. Water samples from The five onsite MWs (MW-1, CHMWE1, CHMWE2, CHMWE4, & CHMWE) contained DRO up to 5.72 mg/L, RRO up to 2.39 mg/L, PCE up to 0.0307 mg/L, TCE up to 0.00949 mg/L, and VC up to 0.0179 mg/L. Grant Lidren
9/4/2012 Site Characterization Workplan Approved On this date, ADEC received the Work Plan for Groundwater Sampling Former Mammoth Trucking Facility, submitted by RSE, dated August 28, 2012. The five onsite MWs (MW-1, CHMWE1, CHMWE2, CHMWE4, & CHMWE) will be sampled for GRO, DRO, RRO, BTEX, and VOCs. Grant Lidren
12/19/2012 Site Characterization Report Approved On this date, ADEC received the Groundwater Monitoring Report Former Mammoth Trucking Facility submitted by RSE dated December 2012. The five onsite MWs (MW-1, CHMWE1, CHMWE2, CHMWE4, & CHMWE) were sampled for GRO, DRO, RRO, BTEX, and VOCs. CHMWE2 contained DRO at 4.5 mg/L and RRO at 1.24 mg/L; all other MWs contained detectable levels of petroleum constituents, but below cleanup levels. CHMWE1 contained PCE at 0.0405 mg/L. CHMWE2 contained TCE at 0.00963 mg/L. CHMWE2 and CHMWE5 contained VC at 0.00677 mg/L and 0.0258 mg/L respectively. The groundwater was observed between 3.85 feet below top of casing at CHMWE2 and 9.58 feet below top of casing at CHMWE1. Grant Lidren
7/16/2013 Update or Other Action On this date, ADEC received the 2013 Passive Soil Gas Survey Work Plan Former Mammoth Trucking site submitted by FES and dated July 10, 2013. A total of 12 passive soil gas samples will be collected. Grant Lidren
1/21/2014 Update or Other Action On this date, ADEC received the 2013 Passive Soil Gas Survey Report Former Mammoth Trucking site submitted by FES and dated December 16, 2013. A total of 12 passive soil gas samples were collected from holes ranging 20 to 30 inches bgs. Gore survey samplers were placed in the bottom of the holes for 10 days. Passive soil gas collected samples contained: PCE at 0.08 ug in M-02; VC at 2.93 ug and benzene at 0.73 in M-07; and benzene at 0.03 at M-08. These samples were collected to the north and west of the building. Grant Lidren
7/14/2014 Site Characterization Workplan Approved Reviewed the 2014 Soil Gas Survey Work Plan, Rev 1 submitted by FES and dated June 27, 2014. ADEC has no objections to the Work Plan and FES may proceed with the following comment: ADEC would like to be accompany FES when the sampling takes place in late summer 2014. Grant Lidren
9/18/2014 Site Visit On this date ADEC performed a field inspection at the site. ADEC witnessed the installation of one soil gas monitoring well located near the location of the former used oil tank. Grant Lidren
3/17/2015 Update or Other Action On this date, ADEC received the 2014 Soil Gas Survey Report Rev1 Former Mammoth Trucking Site submitted by FES dated March 16, 2015. Three soil gas points were advanced: two adjacent to the building and one located 50 feet to the west. Soil gas samples collected from the two soil gas points adjacent to the building contained PCE at 5,400 ug/m3, TCE at 330 ug/m3, and naphthalene at 100 ug/m3. Soil gas samples collected 50 feet west of the building contained VC at 1,800 ug/m3, Cis at 2,200 ug/m3, benzene at 2,200 ug/m3, ethylbenzene at 8,800 ug/m3, xylenes at 8,700 ug/m3, 1,2,4-trimethylbenzene at 8,800 ug/m3, 1,3,5-trimethylbenzene at 6,700 ug/m3 and n-Hexane at 50,000 ug/m3. Grant Lidren
9/2/2015 Site Characterization Workplan Approved The Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program (CSP) has received and reviewed the 2015 Well Installation and Groundwater Sampling Work Plan, Rev 2 Former Mammoth Trucking Site submitted by FES and dated August 31, 2015. Grant Lidren
12/18/2015 Site Characterization Report Approved On this date, ADEC received the 2015 Well Installation and Groundwater Monitoring Report Former Mammoth Trucking Site submitted by FES and dated December 17, 2015. Two boring were advanced and completed as monitoring wells MW-6 and MW-7 and the historic monitoring wells CHMWE1, CHMWE2, EMCONMW-4, and CHMWE5 were sampled. Monitoring wells CHMWE3 & CHMWE4 were damaged therefore not sampled. Borings SB-1 and SB-2 were advanced south of the property. Two soil samples collected at the groundwater interface at 8.5 ft. bgs and one soil sample collected at 12 feet bgs from an area of petroleum odor and elevated PID result did not contain contaminant concentrations above cleanup levels. Four of the six MWs sampled contained contaminant concentrations above cleanup levels. CHMWE1 contained PCE at 0.0521 mg/L. CHMWE2 contained DRO at 2.45 mg/L, TCE at 0.00579 mg/L and VC at 0.00467 mg/L. CHMWE5 contained VC at 0.00585 mg/L. MW-6 contained VC at 0.00760 mg/L. Groundwater was encountered between 4 to 9 feet bgs with GW flow to the south. Grant Lidren
5/24/2016 Report or Workplan Review - Other The Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program (CSP) has received and reviewed the 2016 Groundwater Sampling Work Plan Former Mammoth Trucking Site submitted by FES and dated August 10, 2016. ADEC has no objections to the Work Plan and FES may proceed. Grant Lidren
10/4/2016 Site Characterization Report Approved On this date, ADEC received the 2016 Groundwater Monitoring Report, Rev1 Former Mammoth Trucking Site submitted by FES and dated September 8, 2016. Groundwater samples were collected from six monitoring wells including: CHMWE1, CHMWE2, EMCONMW-4, CHMWE5, MW-6 and MW-7. A petroleum odor was noted in the purge water from CHMWE2 during sampling. Five of the six MWs sampled contained contaminant concentrations above cleanup levels. CHMWE1 contained PCE up to 0.0496 mg/L. CHMWE2 contained DRO at 7.18mg/L, RRO at 4.99 mg/L, TCE at 0.00917 mg/L and VC at 0.00231 mg/L. EMCONMW-4 contained RRO at 1.11 mg/L, CHMWE5 contained VC at 0.0224 mg/L. MW-6 contained VC at 0.0177 mg/L. Groundwater was encountered 1 foot lower than 2015; between 6.18 to 9.85 feet bgs with GW flow to the south. Grant Lidren
8/2/2017 Update or Other Action On this date, ADEC receved the Geotechnical Engineering Report ARRC Sewer Line Extension – Phase IV submitted by Shannon & Wilson dated December 2016. Five soil borings were advanced to a depth of 20 feet bgs. The borings were placed linearly north to south just outside the east property line of ARRC Mammoth Alaska and north of the Kelly-Moore property. Groundwater was encountered 7.0 and 13.2 feet bgs. Five soil samples were collected from four borings B1, B2, B3, and B4. One soil sample collected from each B1, B2, and B3 location highest pid reading 0.2 to 2 feet bgs contained TCE up to 0.189 mg/kg. Soil samples collected from B4 at the ground water interface contained 1,2-dichlorothane up to 0.0150 mg/kg, TCE up to 0.0255 mg/kg, and vinyl chloride up to 0.0117 mg/kg. Grant Lidren
8/22/2017 Site Characterization Workplan Approved On this date, ADEC received and reviewed the Work Plan for Groundwater Sampling at ARRC Former Mammoth Trucking 1048 Whitney Road, Anchorage, Alaska ADEC File # 2100.26.202 submitted by RSE dated August 22, 2017. ADEC has no objections to this work plan and RSE may proceed. Grant Lidren

Contaminant Information

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