Action Date |
Action |
Description |
DEC Staff |
4/17/1998 |
Update or Other Action |
Hobbs Industries reports release of transformer oil from two electrical transformers at the Old Knik Arm Power Plant site. PERP served as the primary responder to this release of an estimated 2400 gallons of transformer oil in the substation area. |
Jim Frechione |
5/14/1998 |
Update or Other Action |
Hobbs Industries indicates response efforts were to intercept product in the storm water drain system (Manholes B6 and B2) and excavate contaminated soil and stored on site. |
Jim Frechione |
8/27/1998 |
Site Characterization Workplan Approved |
ADEC approves of Hobbs Industries work plan conditional on comments in Frechione letter. |
Jim Frechione |
9/24/1998 |
Update or Other Action |
ADEC approves of site activity involving the removal of transformers from the spill location and excavation of additional soil. Hobbs Industries was also requested to define the nature and extent of soil and groundwater impacts resulting from the spill. |
Jim Frechione |
10/19/1998 |
Update or Other Action |
Hobbs Industries reports that transformers were relocated and drained of remaining oil. They estimate approximately 2000 gallons of oil was recovered from the spill incident. They removed concrete ductwork in the substation area and excavated visible contaminated soil. |
Jim Frechione |
11/16/1998 |
Update or Other Action |
ADEC sent memorandum to Attorney General's office to initiate cost recovery efforts. |
Jim Frechione |
11/20/1998 |
Update or Other Action |
ADEC letter to Hobbs Industries commenting on results of soil stockpile samples (7600 to 13300 mg/kg DRO; 0.2 to 0.45mg/kg PCB) and proposal to thermally treat or soil wash. Hobbs Ind. was informed that any plan to treat soil and characterize the spill area requires an ADEC approved work plan. |
Jim Frechione |
6/17/1999 |
Document, Report, or Work plan Review - other |
On this date, ADEC received Ship Creek Brownfields Site Assessment Report Ship Creek Brownfields Site, dated May 1999, submitted by E & E. A site inspection identified numerous potential areas of contamination where samples of: soil; sediment; surface water; and/or groundwater were collected. These areas include: the dismantled electrical substation where the leaky transformers and oil spills have occurred; the former electrical substation where transformer leaks may have occurred; the former coal storage location; the boiler ash silo area; the former dry well location where waste liquids from KAPP equipment and batteries may have been disposed of; the loading and unloading areas; The cooling pond where unregulated (i.e. not permitted by the NPDES program) floor drain discharges may have occurred and contaminants may have migrated from the electrical substation; Ship Creek above the dam where the cooling pond overflow could have impacted; and Ship Creek below the dam where unregulated floor and storm drain discharges have occurred. Area wide soil samples collected contained DRO above ADEC migration to groundwater cleanup levels at four locations: the dismantled electrical substation with DRO up to 414 mg/kg at 4 to 8 feet bgs, the coal storage area with DRO up to 2,100 mg/kg at 1 foot bgs, the former electrical substation with DRO up to 1,010 mg/kg at 9 to 11 feet bgs, and the loading area with DRO up to 297 mg/kg at 0 to 0.5 feet bgs and benzene up to 0.08 mg/kg at 0 to 0.5 feet bgs. PCBs of 0.057 mg/kg were detected in the surface soil at the dismantled electrical which is well below ADEC cleanup levels. PCBs were not detected in the subsurface soil at the KAPP facility. At the three MWs, ground water samples collected contained DRO, with the highest reading from the MW adjacent to the dismantled electrical substation with DRO up to 19.0 mg/L. Off site migration from the KAPP facility is evident by elevations of metals, DRO and PCBs in downgradient areas such as Ship Creek. This is attributed to cooling pond and KAPP storm drain discharge locations which most likely contributed to contaminants above background cleanup levels. |
Grant Lidren |
9/17/1999 |
Update or Other Action |
Site characterization work plan was submitted by T&R Environmental Consulting. The plan was to investigate the spill site and characterize the nature and extent of contamination remaining from the transformer spill incident. |
Jim Frechione |
9/23/1999 |
Update or Other Action |
ADEC conditionally approves of T&R workplan. |
Jim Frechione |
1/27/2000 |
Meeting or Teleconference Held |
A meeting between governmental agencies was held to discuss the possible re-use of the Old Knik Arm Power Plant for power generation. The entity proposing this action is Marlow Power and Steam, Inc. represented by Steigers Corp. |
Jim Frechione |
10/23/2000 |
Update or Other Action |
T&R Environmental Consulting submit stockpile soil samples and the need to treat to target cleanup levels. T&R also submitted a site characterization plan for the spill site. |
Jim Frechione |
10/26/2000 |
Site Ranked Using the AHRM |
Initial ranking. Upon entry, the DB Administrator changed the Toxicity Value from 1.5 (invalid value) to 1 (Transformer Oil); GW Exposure Index Value from 0.4 to 0 because if SW is not a DW source then there is no potential for exposure; and Environmental Recreation Value from 2 to 0 because the site is not actually located in a designated environmentally designated area. Priority changed from Medium to Low. |
Jim Frechione |
10/27/2000 |
Site Added to Database |
Transformer oil release. |
Jim Frechione |
11/17/2000 |
Update or Other Action |
ADEC responds to T&R investigation and recognized that they did not identify soil contamination in the substation spill area. However, EPA's report did identify areas of soil and groundwater contamination in the substation area that may (or may not) be the result of the 1998 spill. ADEC concluded no further investigative action at the time was required but future action might be necessary if levels posed a risk. The soil stockpile treatment plan of soil washing was still being evaluated. |
Jim Frechione |
1/12/2001 |
Update or Other Action |
Hobbs Industries submit a work plan to treat the soil stock pile by soil washing. |
Jim Frechione |
1/22/2001 |
Update or Other Action |
ADEC approves of the soil washing subject to conditions listed in letter to Hobbs. |
Jim Frechione |
1/31/2001 |
Update or Other Action |
Hobbs' consultant (T&R Consulting) submit revised work plan. |
Jim Frechione |
2/5/2001 |
Cleanup Plan Approved |
ADEC approves revised work plan. |
Jim Frechione |
2/7/2001 |
Update or Other Action |
Hobbs Industries indicates that they were able to re-locate soil stockpile (60 cubic yards) into power house building for washing. They requested 1000 ppm DRO for landspread purposes within substation area. |
Jim Frechione |
7/26/2002 |
Update or Other Action |
ADEC requests status of soil washing operation and impacted soil. |
Jim Frechione |
7/27/2002 |
Update or Other Action |
Hobbs Industries provides information that soil washing was completed in 2001. Soil samples confirmed soil was below the 1000 ppm DRO level approved for placement in former substation area. |
Jim Frechione |
10/15/2002 |
Update or Other Action |
No Further Remedial Action letter for the 1998 transformer spill was issued. However, this determination did not apply to the entire site and it should be recognized there may be elevated levels of hazardous substances from other spill events. |
Jim Frechione |
6/21/2007 |
Update or Other Action |
Remedial Investigation ARRC Anchorage Terminal Reserve U.S. EPA Docket No. CERCLA 10-2004-0065, submitted by ENSR and recieved by the ADEC on this date. This site is located at the north bank source area SE-1 in the Anchorage Terminal Reserve lease property 120. SE-1 encompasses contaminated sediment in the KAPP pond. Sediment samples in the KAPP pond indicate PAHs and PCBs in moderate concentrations. Some low level exceedances of inorganics are also present. For more information consult CS file # 2100.38.447 ARRC Anchorage Terminal Reserve
|
Grant Lidren |
4/10/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Grant Lidren |
4/23/2019 |
Site Characterization Report Approved |
On this date, ADEC received the Letter Report for Groundwater Sampling within the ARRC Anchorage Terminal Reserve submitted by RSE and dated April 23, 2019. The eight groundwater Monitoring wells sampled include: MWB08, MWD01, DPD04, MWE04, MWC02, MWE20, MWC01, and MWE11. Monitoring wells MWE04, MWC02, MWE20, MWC01 (all located within ARRC fueling rack and Princess/West tours contaminated sites in the railyard) contained DRO above table C between 1.57 mg/L to 9.09 mg/L. Monitoring wells MWE04 and MWE20 (both located within and downgradient of the ARRC fueling rack) contained RRO above table C between 1.64 mg/L and 3.45 mg/L. Monitoring well MWB08 (located within GW 2/3&4) and MWE04 (ARRC fueling rack) contained VC above TABLE C cleanup levels at 0.510 ug/L and 0.300 ug/L respectively.MWE04 (ARRC fueling rack) contained benzo(a)anthracene and fluorene above table C cleanup levels at 0.330 ug/L and 8.39 ug/L respectively. MWC01 (ARRC Knik Arm Power plant) contained eight PAHs above table C cleanup levels including: benzo (a)anthracene at 1.15 ug/L; benzo[a]pyrene at 1.79 ug/L; benzo[b]flouranthene at 2.54 ug/L; benzo[g,h,i]perylene at 1.59 ug/L; benzo[k]fluoranthene at 0.880 ug/L; chrysene at 2.22 ug/L; dibenzo[a,h]anthracene at 0.403 ug/L; and Indeno[1,2,3-c,d]pyrene at 1.26 ug/L.MWE11 (located east of GW-5/Arctic Cooperage) contained Arsenic above table C cleanup levels at 13.2 ug/L. MWE20 (located downgradient of the fueling rack) contained four metals above table C cleanup levels including: arsenic at 139 ug/L, cadmium 29.4 ug/L, lead at 231 ug/L, and mercury at 2.7g ug/L. Only monitoring wells MWD01 and DPD04, located upgradient adjacent to bluff, did not contain any contaminant concentrations above Table C cleanup levels. |
Grant Lidren |