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Site Report: Quality Asphalt Paving

Site Name: Quality Asphalt Paving
Address: 240 West 68th, Anchorage, AK 99501
File Number: 2100.26.210
Hazard ID: 23979
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.159798
Longitude: -149.885477
Horizontal Datum:NAD83

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 August 3, 2000 a 5000 gallon gasoline and a 12000 gallon diesel tank were removed. The dispenser island and piping were purported to have been removed in 1994. 485 cy of gasoline/diesel contaminated soil were removed during the tank pull. 6000 gallons of contaminated ground water was pumped during excavation work and treated. In 2001 the contaminated soil stockpile was treated in the hot asphalt plant and incorporated into asphalt used on the property. Five soil borings/monitoring wells were installed on 9/18/01. Depth to groundwater was 1.73 to 4.95 feet below ground surface. 1060 mg/kg DRO soil contamination was encountered at one location (QA-3 at a 6 foot depth). Up to 4.49 mg/l DRO and 1.67 mg/l RRO was found in the groundwater. Groundwater exceeded default cleanup levels at monitoring well QA-3 and QA-4. An on property process water well (which was disconnected from the MOA AWWU system on 6/19/01) is located about 300 feet to the northwest of monitoring well QA-4.Groundwater flow direction is calculated to the south, southwest, and northwest. The former stockpile areas were assessed on 10/3/01. All soil samples in those areas meet default cleanup levels. The former dispenser area was also sampled and all soils met default cleanup levels. F.K.A. L55.370

Action Information

Action Date Action Description DEC Staff
8/3/2000 Site Added to Database Former Staff
8/3/2000 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77757 Gasoline and diesel contamination found in the soil and groundwater during the removal of a 5000 gallon gasoline tank and a 12,000 gallon diesel tank. The piping and dispenser are purported to have been removed around 1994. Robert Weimer
8/3/2000 Leaking Underground Storage Tank Cleanup Initiated - Petroleum Former Staff
8/9/2000 Site Visit Site visit during the excavation of contaminated soil at the site. Robert Weimer
8/10/2000 Underground Storage Tank Site Characterization or Assessment 485 cubic yards of gasoline/diesel contaminated soil was generated during the removal of a gasoline and diesel tanks. 6000 gallons of contaminated water was also removed and treated. Groundwater was encountered at 6 feet below ground surface. The tanks had been last used in 1994 and the dispenser island and piping were also reported to have been removed around 1994. All excavation soil samples met default cleanup levels, but the piping area was not adequately assessed. Some groundwater contamination remains (up to 2.38 mg/l DRO and 2.09 mg/l RRO). Robert Weimer
10/3/2000 Leaking Underground Storage Tank Corrective Action Underway Corrective action plan to treat the 485 cubic yards of gasoline/diesel contaminated soil in the asphalt plant and incorporate into hot asphalt to be used on the property. Robert Weimer
10/20/2000 Update or Other Action Received copies of stockpile sampling field notes. Robert Weimer
2/28/2001 Update or Other Action Received copies of UST removal field notes. Robert Weimer
3/20/2001 Update or Other Action ADEC letter requesting release investigation workplan for soils between tanks and dispenser, and monitoring wells to define the level and extent of the groundwater contamination. Robert Weimer
4/23/2001 Update or Other Action Proposed asphalt treatment and use on property is public noticed. Robert Weimer
5/15/2001 Update or Other Action Corrective action plan approved after public notice period ended with no comments received. Robert Weimer
6/1/2001 Document, Report, or Work plan Review - other Asphalt treatment of the contaminated soil stockpile and use on the property completed. Robert Weimer
8/13/2001 Update or Other Action ADEC requested a workplan for the assessment of the former contaminated soil stockpile area near the crusher plant. ADEC also has not received the release investigation workplan to define the level and extent of the groundwater contamination at the former tank area, and to assess for soil contamination in the former piping area. Robert Weimer
9/18/2001 Update or Other Action ADEC conditionally approves the release investigation workplan submitted on 9/10/01. Robert Weimer
3/20/2002 Release Investigation Five soil borings/monitoring wells were installed and sampled on 9/18/01. Depth to groundwater was 1.73 to 4.95 feet below ground surface. 1060 mg/kg DRO soil contamination was encountered at one location (QA-3 at a 6 foot depth). The RP's consultant has proposed a Method 3 DRO cleanup level of 2930 mg/kg. Up to 4.49 mg/l DRO and 1.67 mg/l RRO was found in the groundwater. Groundwater exceeded default cleanup levels at monitoring well QA-3 and QA-4. An on property process water well (which was disconnected from the MOA AWWU system on 6/19/01) is located about 300 feet to the northwest of monitoring well QA-4.Groundwater flow direction is calculated to the south, southwest, and northwest. The former stockpile areas were assessed on 10/3/01. All soil samples in those areas meet default cleanup levels. The former dispenser area was also sampled and all soils met default cleanup levels. Robert Weimer
12/12/2005 Update or Other Action File Review - One area of soil contamination (QA-3) at 6 feet had 1060 mg/kg DRO in sample collected on 9/18/01. Two monitoring wells had contamination the last time they were sampled on 9/18/01. QA-3 had 4.49 mg/l DRO and 1.67 mg/L RRO. QA-4 had 2.9 mg/l DRO and 1.41 mg/L RRO. Recommend that water samples be collected from QA-3 and QA-4 to check what the current levels of groundwater contamination. Also recommend that a confirmation soil sample be collected near QA-3 at 6 feet to determine if soils are still above default cleanup levels in that area. Robert Weimer
3/29/2006 Update or Other Action Talked with consultant. They are putting together a proposal to collect a groundwater samples from monitoring wells QA-3 and QA-4 for DRO and RRO. They then plan to remove any remaining contamination in the QA-3 area and take a confirmation sample. Excavated contaminated soil is to be treated. If the groundwater was still over cleanup levels at QA-3 a replacement monitoring well would need to be installed at the downgradient edge of the excavation. If the groundwater in QA-3 and/or QA-4 is still over cleanup levels then additional groundwater sampling events would be needed until it is demonstrated that the groundwater meets cleanup levels. Robert Weimer
4/24/2006 Update or Other Action ADEC approves the 4/24/06 corrective action workplan. The plan calls for sampling monitoring wells QA-3 and QA-4 for DRO and RRO, removal of the remaining contaminated soil near QA-3, off property treatment of the excavated contaminated soil, and collecting confirmation soil samples. Robert Weimer
8/3/2006 Site Visit Site visit to observe excavation of contaminated soil. Robert Weimer
8/16/2006 Update or Other Action ADEC approved plan to thermally treat 25 cubic yards of DRO contaminated soil. Robert Weimer
10/6/2006 Update or Other Action ADEC requests a replacement monitoring well for QA-3, and sampling for DRO and RRO of monitoring wells QA-3 and QA-4 this fall. Robert Weimer
10/6/2006 Update or Other Action Review of corrective action report. Excavation now meets site cleanup levels. Groundwater contamination remains at QA-3 and QA-4 areas. Excavated soils are awaiting thermal treatment at ASR. Robert Weimer
12/13/2006 Update or Other Action Approved disposal of contaminated purge water in AWWU sanitary sewer. Robert Weimer
3/15/2007 Document, Report, or Work plan Review - other October 17, 2006 groundwater monitoring event. Two monitoring wells were sampled (QA-3R and QA-4) for DRO and RRO. Up to 2.30 mg/l DRO and 4.16 mg/l RRO in the groundwater. The depth to groundwater was 4.3 to 8.1 feet below ground surface. The contamination levels increased in one monitoring well and decreased in the other. Robert Weimer
3/15/2007 Update or Other Action ADEC requests that monitoring wells QA-3R and QA-4 be sampled for DRO and RRO in the spring and fall of 2007. Based on the results of the sampling ADEC will determine what (if any) further monitoring will be required for closure. Robert Weimer
3/15/2007 Exposure Tracking Model Ranking Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site. Robert Weimer
9/2/2008 Document, Report, or Work plan Review - other May 3, 2007 groundwater monitoring event. Two monitoring wells were sampled (QA-3R and QA-4) for DRO and RRO. Up to 0.696 mg/l DRO and 0.461 mg/l RRO in the groundwater. The depth to groundwater was 2.86 to 5.45 feet below ground surface. The contamination levels decreased in the monitoring wells. Robert Weimer
9/3/2008 Document, Report, or Work plan Review - other October 5, 2007 groundwater monitoring event. One monitoring well was sampled (QA-3R) for DRO and RRO. Up to <0.400 mg/l DRO and <0.400 mg/l RRO in the groundwater. The depth to groundwater was 5.71 feet below ground surface. The contamination levels decreased in the monitoring well. Monitoring well QA-4 could not be sampled because it was dry. Robert Weimer
9/3/2008 Update or Other Action ADEC requests another groundwater monitoring event for monitoring well QA-4 for DRO and RRO. Robert Weimer
12/1/2009 Document, Report, or Work plan Review - other May 12, 2009 groundwater monitoring event. One monitoring well was sampled (QA-4) for DRO and RRO. Up to <0.410 mg/l DRO and <0.410 mg/l RRO in the groundwater. The depth to groundwater was 3.55 feet below ground surface. The contamination levels decreased in the monitoring well. Robert Weimer
12/18/2009 Update or Other Action Talked with RP's consultant. The monitoring wells are approved for decommissioning, and request documentation of that prior to site closure. Robert Weimer
12/21/2010 Update or Other Action Received notification from RP's consultant that the monitoring well abandonment has been delayed until the summer of 2011. Robert Weimer
12/29/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77757 2000 UST. Robert Weimer
10/28/2011 Update or Other Action Based on monitoring well abandonment information the site may be issued corrective action complete status. Robert Weimer
6/26/2013 Site Visit Unable to located wells QA-1, QA-2, and QA-5. These are lost and presumed to be buried under gravel. Jacob Gano
10/2/2013 Update or Other Action ADEC received a monitoring well decommissioning report. Wells QA-1 and QA-2 were located and properly decommissioned. Well QA-5 was located and left in place as it was covered by asphalt. Meghan Dooley
10/7/2013 Cleanup Complete Determination Issued Corrective Action Complete determination issued for the site. Meghan Dooley
10/8/2013 Update or Other Action One well, QA-5, was not decommissioned as it was covered by asphalt. As part of the closure determination, should the well become damaged, uncovered, or otherwise accessible it must be properly decommissioned. ADEC may perform an inspection in the future to check the condition of the well. Meghan Dooley

Contaminant Information

Name Level Description Media Comments
RRO < Table C Groundwater
DRO < Table C Groundwater

Control Type

Type Details
No ICs Required

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site.

No associated sites were found.

Missing Location Data

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby