Site Report: Tudor Centre Subdivision Tract F
| Site Name: | Tudor Centre Subdivision Tract F |
|---|---|
| Address: | 4145 Tudor Centre Drive, Tract D, Lot 4, Anchorage, AK 99508 |
| File Number: | 2100.38.046 |
| Hazard ID: | 3732 |
| Status: | Cleanup Complete - Institutional Controls |
| Staff: | IC Unit, 9074655229 dec.icunit@alaska.gov |
| Latitude: | 61.184177 |
| Longitude: | -149.793838 |
| Horizontal Datum: | WGS84 |
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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
The site was reportedly part of an equipment parking area within the historic gravel mining and asphalt production facility that occupied University Lake to the north (which was created by gravel mining) and the area between University Lake and Tudor Road comprising an estimated 135 acres. Contamination appears to have resulted from surface diesel spills that were later covered when up to three feet of imported fill that was placed over portions of the former facility. Contamination was discovered at the site during geotechnical borings in 2000; additional borings in 2002 encountered maximum contaminant concentrations in soil of 4,490 mg/kg DRO from a sample at 11 feet below ground surface (bgs); 0.125 mg/kg benzene from a sample at 5.4 feet bgs and 0.08 mg/kg at 11 feet bgs. Depth to groundwater is expected to coincide with the surface elevation of nearby University Lake. Chester Creek is approximately 100 feet from the site. Former facility operators were Cheney Construction Company, Norcoast Constructors, Inc.; and a joint venture consisting of Rogers Construction, Inc., and Babler Bros. (Rogers & Babler)a division of (former) MAPCO. University Lake was created by gravel mining prior to the mid-1970s and provided material to the asphalt plant. During property development in 2002 the site was within former Tract D, Lot 4 of Tudor Centre Subdivision but as a result of re-platting in 2006 is now within the eastern portion of Tract F of Tudor Centre Subdivision; the site name was changed from Tudor Centre Subdivision Tract D4 to Tract F to reflect the current legal description.
Action Information
| Action Date | Action | Description | DEC Staff |
|---|---|---|---|
| 3/14/2002 | Site Added to Database | DRO, benzene. | Former Staff |
| 3/14/2002 | Cleanup Plan Approved | Approved the March 2002 Sampling and Analysis / Workplan for Contaminated Soil Cleanup at Tract D, Lot 4, Tudor Centre Subdivision proposing excavation of the contaminated soil and transport to Alaska Soil Recycling for thermal treatment. | Eileen Olson |
| 4/9/2002 | Site Characterization Report Approved | Reviewed and approved findings of report dated April 2002 and received on April 2, 2002: "Contaminated Soil Cleanup Report." | Eileen Olson |
| 4/10/2002 | Document, Report, or Work plan Review - other | Site closure granted in a letter dated 4/10/2002 based on April 2002 report documenting that DRO and benzene levels in confirmation samples were below the most stringent 18 AAC 75.341 Method 1 cleanup levels. Site closure was rescinded in a letter dated July 21, 2006 following the discovery of contamination during foundation excavation work on July 19, 2006. See entry dated July 21, 2006. | Eileen Olson |
| 11/4/2003 | Update or Other Action | File number changed from CS100.258 to 2100.38.046 | Sarah Cunningham |
| 7/20/2006 | Document, Report, or Work plan Review - other | Consultant for owner (RSE) reported that contamination was encountered on July 19th during excavation at the northeast corner of the building excavation footprint of the future day care center. Oil-stained soil was observed at a depth of six feet adjacent to crushed drums of viscous asphaltic-type oil; samples were collected for rush analysis for GRO/BTEX, DRO/RRO, PCBs, chlorinated solvents and RCRA metals. Consultant noted that the area soil consists of an approximate 8 to 10 foot thick fill pad placed over original peat ground surface. Consultant RSE also noted that in 2002 a similar cleanup of oil encountered in a nearby excavation took place in a location about 500 feet south of this site, and that characterization of similar oil at the 2002 site showed no exotics only DRO and RRO, noting that "We know the area was used extensively for asphalt batch plant and aggregate processing operations that were frequently fueled with Bunker oil." | Eileen Olson |
| 7/21/2006 | Document, Report, or Work plan Review - other | Site closure was rescinded and a plan was approved in a letter dated July 21, 2006 following the discovery of contamination during foundation excavation work on July 19, 2006. Plan approval was granted for "Workplan for Excavation Segregation and Stockpiling of Contaminated Soils on Tracts D-3 and D-4 of the Tudor Centre Subdivision: Southcentral Foundation Daycare Project". | Eileen Olson |
| 9/18/2006 | Update or Other Action | ADEC received "Site Investigation Summary for Tracts D-3 and D-4 of the Tudor Centre Subdivision, Southcentral Foundation Daycare Project" dated 9/18/2006. Report documents removal of contaminated soil and debris encountered during preconstruction activities. Three excavation confirmation samples had DRO levels of 267, 300 and 329 mg/Kg, slightly above the method two cleanup level. Expect to grant conditional closure upon receipt of ASR thermal remediation records for 1,132 tons of contaminated soil. | Eileen Olson |
| 10/17/2007 | Update or Other Action | Received thermal remediation post-treatment results for soil transported to ASR in fall 2006. | Eileen Olson |
| 4/18/2008 | Exposure Tracking Model Ranking | Initial ranking with ETM completed. | Eileen Olson |
| 9/22/2014 | Update or Other Action | Preliminary evaluation of file to determine whether conditional closure can be granted; some uncertainty re location of site following replatting in 2006. | Eileen Olson |
| 4/3/2015 | Exposure Tracking Model Ranking | Updated ETM ranking. | Eileen Olson |
| 4/21/2015 | Cleanup Complete Determination Issued | Decision document issued. | Eileen Olson |
| 4/21/2015 | Institutional Control Record Established | Institutional Controls established and entered into the database. | Eileen Olson |
| 11/16/2015 | Institutional Control Compliance Review | IC compliance review conducted, staff name changed from Olson to IC Unit, and set the reminder system to review the site record April 2020. | Nathan Maxwell |
Contaminant Information
| Name | Level Description | Media | Comments |
|---|---|---|---|
| DRO | Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation | Soil | |
| Benzene | Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation | Soil |
Control Type
| Type | Details |
|---|---|
| Notice of Environmental Contamination |
Requirements
| Description | Details |
|---|---|
| Advance approval required to transport soil or groundwater off-site. | Standard condition. |
| Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70) | Standard condition. |
No associated sites were found.