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Site Report: ARRC Consolidated Freightways / SBS Building


Site Name: ARRC Consolidated Freightways / SBS Building
Address: 801 West 1st Avenue, Anchorage, AK 99501
File Number: 2100.38.514
Hazard ID: 25488
Status: Active
Staff: Grant Lidren, 9072698685 grant.lidren@alaska.gov
Latitude: 61.221204
Longitude: -149.898796
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

On September 29, 2009, petroleum-impacted soil was encountered during an site assessment of a 2,000-gallon underground heating oil tank, a large portion of which was built into and underneath the building. Four soil samples: two-2 feet north of the tank, one-12 feet north of the tank, and one-5 feet east of the tank; collected at the groundwater interface,5 feet bgs; contained DRO up to 10,700 mg/kg and benzene up to 0.0624 mg/kg.

Action Information

Action Date Action Description DEC Staff
1/14/2010 Report or Workplan Review - Other On this date ADEC received CF/SBS Building Subsurface Soil Sampling Report, submitted by Clarus, dated January 14, 2010. On September 29, 2009, petroleum-impacted soil was encountered during a site assessment of a 2,000-gallon underground heating oil tank, a large portion of which was built into and underneath the building. Four soil samples: two-2 feet north of the tank, one-12 feet north of the tank, and one-5 feet east of the tank; collected at the groundwater interface,5 feet bgs; contained DRO up to 10,700 mg/kg and benzene up to 0.0624 mg/kg. Grant Lidren
1/26/2010 Site Added to Database A new site has been added to the database Mitzi Read
1/26/2010 Exposure Tracking Model Ranking Initial ranking with ETM completed for source area id: 78850 name: 2,000-gallon Underground HOT Mitzi Read
5/13/2010 Report or Workplan Review - Other On this date, ADEC approved: a work plan for a UST removal; and transportation of associated contaminated soil. In mid May 2010, Clarus will remove a heating oil unregulated UST and excavate and transport 50 tons of contaminated soil to ASR. Three confirmation soil samples will be collected from the base of the excavation and analyzed for DRO and BTEX. Grant Lidren
7/13/2010 Report or Workplan Review - Other On this date, ADEC received the UST Removal Report CF/SBS Building, submitted by Clarus and dated July 9, 2010. A 5,000 gallon UST and associated piping were removed on May 4, 2010. The bottom of the UST was located at 4 feet bgs. A small pinhole was noted on the southeast upper edge of the UST. Forty cubic yards of contaminated soil were removed to the best extent practicable due to the proximity of the building, and treated at ASR. Three soil samples collected from the sidewalls of the excavation, at the groundwater interface at 3.5 ft. bgs, contained DRO up to 23, 800 mg/kg. Benzene was not detected but the detection limit was elevated up to 0.0427 mg/kg. the excavation was backfilled with clean fill. Grant Lidren
4/3/2012 Meeting or Teleconference Held Per a meeting with ARRC on this date, the onsite building has been decommissioned. the concrete foundation remains. The ARRC plans to remove the foundation in the future. Contaminated soil at this site will be addressed at this time. The groundwater at the site need to be evaluated in the future. Grant Lidren
10/6/2015 Potentially Responsible Party/State Interest Letter PRP letter sent to ARRC on this date Grant Lidren
10/13/2015 Site Visit On this date, ADEC met with FES and ARRC during removal of two 2,000-gallon regulated Gasoline and diesel USTs (see file: 2100.26.602). Contamination was encountered beneath at least one of the tanks evident by a petroleum odor and gray stained soil. FES collected analytical soil samples. ARRC will address contamination next year in conjunction with contaminated soil removal at the former 2,000 gallon HOT and groundwater investigation. Grant Lidren
8/4/2016 Site Characterization Workplan Approved ADEC reviewed the Contaminated Soil Removal Work Plan, Rev1 801 W. First Ave submitted by FES and dated July 29, 2016. ADEC has no objections to the Work Plan and FES may proceed pending the following comments:1)Up to two soil samples will be collected from each soil boring; one from the groundwater interface and one from the highest elevated pid reading. If there are no elevated pid reading and or visual/olfactory evidence of contamination, then only the one soil sample needs to be collected from the groundwater interface. 2)ADEC recommends a low PID threshold for both excavations to ensure contaminated soil is removed to the best extent practicable. However, if FES thinks the threshold of 50 ppm and 10 ppm is sufficient to guide the excavation of contaminated material, ADEC has no objections. Note: if significant contamination remains it will have to be further evaluated/excavated at a later date. Additionally, in accordance with the field sampling guidance, analytical soil samples will need to be collected from the highest pid sample locations, which may be well below the 50 ppm and 10 ppm threshold. Grant Lidren
12/6/2016 Site Characterization Report Approved On this date, ADEC received the 2016 Soil Removal Report submitted by FES dated November 20, 2016. A total of 540 tons of petroleum contaminated soil was removed. Approximately 10 tons was removed from the north excavation (former underground HOT) and 530 tons was removed from the south excavation (former regulated USTs 3 & 4). Soil was excavated to the groundwater interface: 3 feet bgs at the north excavation and 6 feet bgs at the south excavation. At the north excavation, nine soil samples collected from the sidewalls just above the groundwater interface at 2 to 2.5 feet bgs did not contain contaminant concentrations above cleanup levels. At the south excavation, contaminated soil was noticeably stained gray with a petroleum odor and the excavation floor was partially filled with groundwater leading to limited sampling. A total of twenty-four soil samples collected from the excavation floor at 6 feet bgs and the sidewalls at 4 to 5 feet bgs contained contamination concentrations above cleanup levels with DRO up to: 2,610 mg/kg; GRO up to 1,650 mg/kg; benzene up to 2.73 mg/kg; toluene up to 10.5 mg/kg; ethylbenzene up to 78.5 mg/kg; xylenes up to 403 mg/kg; 1,2,4 trimethylbenzene up to 287 mg/kg; 1,3,5 trimethylbenzene up to 62.9 mg/kg; propyl benzene up to 41 mg/kg; naphthalene up to 36 mg/kg; isopropylbenzene up to 17.2 mg/kg; n-propylbenzene up to 30.3 mg/kg and sec-butylbenzene up to 5.44 mg/kg. Contamination remains at both the north and south excavation. Grant Lidren
8/9/2017 Site Characterization Workplan Approved On this date, ADEC approved the ARRC Consolidated Freightways / SBS Building Site Characterization Work Plan (Rev 1.1) ADEC File No: 2100.38.514 and 2100.26.602 Grant Lidren
9/25/2017 Offsite Soil or Groundwater Disposal Approved On this date, ADEC approved the transport of three 55-gallon drums of drill cutting IDW to ASR for thermal remediation. Grant Lidren

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