| Action Date |
Action |
Description |
DEC Staff |
| 2/13/1992 |
Update or Other Action |
In a letter to Richard Raynor of the MOA, to expedite the process, the ADEC supports the idea of the MOA consolidating petroleum-contaminated soils resulting from tank pulls and upgrades into one or more pre-designated areas located away from residences for treatment. |
Marianne See |
| 11/9/1992 |
Update or Other Action |
Reviewed and approved the Shannon & Wilson, Inc. "Phase I Soil Treatment Facility Alternative/Cost Evaluation for Handling/Treating/Recycling Hydrocarbon Laden Soils on Municipal Projects dated 10/22/92. |
Scott Bailey |
| 7/14/1994 |
Update or Other Action |
Received a copy of the Shannon & WIlson, Inc. "Request to Remove Stockpiled Soils from the MOA Temporary Storage Cells at 5701 Northwood Street" dated 7/12/94. |
Eileen Olson |
| 8/29/1994 |
Update or Other Action |
Approved the Shannon & Wilson, Inc. "Request to Remove Stockpiled Soils from the MOA Temporary Storage Cells at 5701 Northwood Street" dated 8/26/94. |
Eileen Olson |
| 9/15/1994 |
Update or Other Action |
Received a copy of the Shannon & WIlson, Inc. "Workplan for Municipal Long Term Passive Biventing Cell" dated 9/14/94. |
Eileen Olson |
| 11/17/1997 |
Site Characterization Workplan Approved |
Reviewed and conditionally approved a copy of the Golder Associates "Workplan for Further Characterization of Stockpiled Soils MOA -Northwood Facility" dated 10/16/97, received 10/30/1997. One condition is taking an analytical sample in the immediate vicinity of the sump, and within a foot of the bottom of the cell, for a total of 7 additional analytical samples to be analyzed for DRO. The other condition is at least 1 soil sample must be obtained for each 10 cubic yards of stockpiled soil for field screening purposes following the ADEC UST Procedures Manual dated 9/22/95, obtaining samples from various depths but not less than 18" beneath the exposed pile surface. and documenting the results. |
Eileen Olson |
| 12/7/1998 |
Update or Other Action |
Reviewed a copy of the Golder Associates report "Additional Characterization of Stockpiled Soils MOA -Northwood Facility" dated 10/29/98, received 11/2/1998 and sent a letter requesting no further investigation or cleanup of the subject soils and not objecting to the report recommendation that the soils be graded to the existing grade adjacent to the stockpile. The report documented fiedl screening and sampling of approximately 3,000 cubic yards of soil which were remediated in a biocell. The soils were origianlly excavated in the summer of 1994 during a MOA road improvement project at East 70th Avenue and the Old Seward Highweay. Biocell sampling done in 1997 and 1998 included field screening of 316 locations within the stockpile, and collection and analysis of 20 samples based on field screening results. None of the analytical results exceeded the applicable cleanup standard of 250 mg/kg DRO. |
Eileen Olson |
| 9/22/2000 |
Cleanup Plan Approved |
Reviewed and approved the two Shannon & WIlson, Inc. work plans "Work Plan for Excavation of Contaminated Soils at the Northwood Street Maintenance Facility; 5701 Northwood Street, Anchorage, Alaska" dated 7/25/00, received by the CSP on 8/8/00 and further described as "Work Plan, Cleanup of Drain Discharge Staining" and "Work Plan, Cleanup of Unknown Source Staining". |
Eileen Olson |
| 8/14/2001 |
Cleanup Plan Approved |
Based on review of laboratory data submitted approval is granted to transport and thermally remediate approximately 110 tons of contaminated soil generated from the installation of an oil separator inside the facility at Alaska Soil Recycling. |
Eileen Olson |
| 11/10/2004 |
Site Added to Database |
DRO. |
Sarah Cunningham |
| 11/12/2004 |
GIS Position Updated |
Topozone. NAD27. |
Sarah Cunningham |
| 11/15/2004 |
Site Ranked Using the AHRM |
Initial ranking. |
Sarah Cunningham |
| 5/22/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Bill Petrik |
| 5/16/2012 |
Site Visit |
CSP conducted site visit to inspect for diesel range organic (DRO) staining. Test pits were dug and olfactory, visual and water sheening was used to determine if DRO contamination occurred. No staining was visible at site. No sheening of water and no DRO smell. |
Katrina Chambon |
| 6/7/2012 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 74280 Biocell Storage Areas. |
Katrina Chambon |
| 11/19/2012 |
Document, Report, or Work plan Review - other |
This is in follow-up to our telephone discussion on November 7, 2012, in which we discussed the status of cleanup of the Municipality of Anchorage’s Northwood Street Maintenance Facility. As we discussed, the MOA never implemented your consultant Shannon & Wilson’s (S&W) work plans dated July 25, 2000 addressing two surface stains on the northern and southern portions of the property, respectively.
The first area of concern is two interconnected stained areas with dimensions of approximately 9 feet by 16 feet and 2 feet by 12 feet located west of the facility. The soils were impacted by a discharge of unknown duration from the floor drain located inside the MOA maintenance building. The floor drain was connected to the sewer pipe that drained onto the surface of the land in a grassy area located approximately 75 feet outside of the buildings west wall.
The work plans proposed: to remove approximately 170 square feet of oil stained surface soil from the northern side and remove approximately 800 square feet of oil stained surface soil from the southern side.
Prior to submittal of the July 25 plans, initial soil sampling was conducted in May 2000 to characterize contaminants and estimate a vertical extent of the soil impact. Field screening and one characterization sample was collected from each site. Soil samples were analyzed for DRO, RRO, gasoline range organics (GRO), polychlorinated biphenyls (PCBs), halogenated volatile organics (HVO), aromatic volatile organics including benzene, toluene, ethylbenzene and xylenes (BTEX) and RCRA metals. Soil samples exceeded DEC’s 18 AAC 75.341 migration to groundwater and/or direct contact and outdoor inhalation cleanup levels for DRO and RRO.
• DRO concentrations were 4,850 mg/kg and 31,700 mg/kg
• RRO concentrations were 3,850 mg/kg and 50,500 mg/
There are several methods to move forward – e.g., provide a schedule to implement the subject work plans, or submit a work plan, including a schedule, to conduct a release investigation at the site. CSP requests that a soil samples be collected at the two sites and analyzed for DRO and RRO. Please submit work plan by January 30, 2013 |
Katrina Chambon |
| 1/14/2013 |
Document, Report, or Work plan Review - other |
Shannon and Wilson collected one sample from two areas that have stained soil on November 21, 2012. Sample SS1 was collected from the Northern Stained Area at a depth of approximately 1 foot below the ground surface (bgs). SS1 was positioned about 4 feet west of where effluent from the culvert would first contact the soil. Sample SS1 had 6,520 mg/kg diesel range organics (DRO) and 22,900 mg/kg residual range organics (RRO). Sample 16331-S1, collected at this approximate location and depth on May 16, 2000, had 31,700 mg/kg DRO and 50,500 mg/kg RRO. These results indicate that a reduction in the DRO concentration of about 80% and the RRO concentration of about 55% has occurred naturally over the past 12.5 years at the location of the Northern Stained Area.
Sample SS2 was collected from the Southern Stained Area at a depth of approximately 0.5 foot bgs. Sample SS2 was positioned in an eroded area below the top of slope. Sample SS2 had 380 mg/kg DRO and 2,980 mg/kg RRO. Sample 16332-S1, collected on May 16, 2000 in the approximate location and depth of Sample SS2, had 4,850 mg/kg DRO and 3,850 mg/kg RRO. These results indicate that a reduction in the DRO concentration of about 90% and the RRO concentration of about 23% has occurred naturally over the past 12.5 years at the location of the Southern Stained Area.
MOA requested that DRO and RRO be remediated by monitored natural attenuation. |
Katrina Chambon |
| 1/15/2013 |
Update or Other Action |
Request for Work Plan for MOA Northwood Maintenance Surface Soil Staining sent.
S&W conducted soil sampling on November 21, 2012 from two areas that have surface soil staining. Two soil samples were collected and analyzed for DRO and RRO. The results are:
• SS1 (northern stained area) DRO concentration was 6,520 mg/kg
• SS1 RRO concentration was 22,900 mg/kg
• SS2 (southern stained area) DRO concentration was 380J mg/kg
• SS2 RRO concentration was 2,980 mg/kg
The most stringent soil cleanup levels (migration to groundwater, MTW) for DRO is 250 mg/kg. The most stringent soil cleanup level (ingestion) for RRO is 10,000 mg/kg. The RRO soil concentration from SS1exceeds DEC’s 18 AAC 75.341 cleanup levels for the MTG, inhalation, and ingestion pathways. As you may be aware, CSP incorporated a closure policy for contaminated sites in 1999 (enclosed). This policy provides guidance for project managers to close a site. However, because RRO concentrations exceeds its human health (i.e., ingestion and outdoor inhalation) cleanup levels, CSP requests a work plan, including a schedule, to address the remaining elevated contamination
|
Katrina Chambon |
| 2/12/2014 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79604 name: Southern Stained Area |
Katrina Chambon |
| 2/12/2014 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79605 name: Northern Stained Area |
Katrina Chambon |
| 4/24/2014 |
Site Visit |
Site visit today to inspect area of release during spring melt. The area is heavily vegetated and no staining or sheen on surface water was observed. |
Bill O'Connell |
| 5/27/2015 |
Meeting or Teleconference Held |
Met with RP representative and consultant to discuss path forward for site and requested a work plan. |
Lisa Krebs-Barsis |
| 11/19/2018 |
Document, Report, or Work plan Review - other |
Shannon & Wilson submitted report describing results of sampling near-surface soil in the vicinity of the northern and southern stained areas. |
Janice Wiegers |
| 5/12/2021 |
Site Characterization Report Approved |
The ADEC approved the soil investigation report dated November 19, 2018 and prepared by Shannon & Wilson, Inc. The report approval letter was issued on May 12, 2021. |
Randy Guintu |
| 6/1/2021 |
Meeting or Teleconference Held |
Randy Guintu of ADEC participated in an onsite inspection of the Northwood Drive site with Travis O'Rourke (MOA) and Jessica Tibetts (Shannon & Wilseon, Inc) to discuss future cleanup activities. |
Randy Guintu |
| 7/8/2021 |
Site Characterization Workplan Approved |
Sent Responsible Party work plan approval letter for Revised Work Plan for Groundwater Monitoring, 5701 Northwood Drive, Anchorage, Alaska; ADEC File No. 2100.38.536, Dated July 6, 2021. |
Jessica Hall |
| 12/1/2021 |
Workplan Requested |
Requested an update from the RP on the work plan request that was sent on May 12, 2021. The work plan is now over due as the letter requested a submittal of the work plan by July 12, 2021. |
Jessica Hall |
| 1/12/2022 |
Document, Report, or Work plan Review - other |
Sent RP comments on the ““Groundwater Monitoring Report”, dated December 1, 2021. Requested updated report be submitted for ADEC review. |
Jessica Hall |
| 1/18/2022 |
Site Characterization Report Approved |
Sent RP approval letter for the “Groundwater Monitoring Report”, dated January 12, 2022. |
Jessica Hall |
| 5/10/2022 |
Document, Report, or Work plan Review - other |
ADEC sent RP comments on “Work Plan for Additional Site Characterization Activities”, dated February 25, 2022. ADEC requested an updated work plan be submitted. |
Jessica Hall |
| 6/1/2022 |
Site Characterization Workplan Approved |
ASDEC sent RP approval letter for “Work Plan for Additional Site Characterization Activities”, dated May 20, 2022. Field work expected to start next week. |
Jessica Hall |
| 6/9/2022 |
Update or Other Action |
Field work to start June 9, 2022 per Shannon and Wilson. |
Jessica Hall |
| 10/3/2024 |
Site Characterization Report Approved |
Approved the Additional Site Characterization Activities Report dated November 2022. In May 2022, seven hand auger borings were advanced within and around the northern and southern stained area footprints and the two suspected source area borings were converted to temporary monitoring wells. All samples were analyzed DRO, RRO, VOCs, and PAHs. DRO (maximum 1,780 mg/kg) was detected in all soil samples and exceeded the DEC Table B2 migration to groundwater (MTG) cleanup level in borings HB1, HB2, HB4 and HB6. DRO (maximum 3.9 mg/L) and RRO (maximum 25.4 mg/L) were detected above the DEC Table C groundwater cleanup levels (1.5 mg/L and 1.1 mg/L respectively) in all groundwater samples. A new workplan was requested. |
Dawn Wilburn |
