| Action Date |
Action |
Description |
DEC Staff |
| 4/4/2016 |
Spill Transferred from Prevention Preparedness and Response Program |
Spill transferred by PPRP staff Allison Natcher. Spill no. 16119903303; spill date = 2/2/16; substances = tetrachloroethylene, trichloroethylene, cis-1,2 dichloroethylene; quantity = unknown. |
Mitzi Read |
| 4/7/2016 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 4/7/2016 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79898 name: Former Capital City Cleaners Nugget Mall |
Mitzi Read |
| 4/8/2016 |
Potentially Responsible Party/State Interest Letter |
Sent certified # 7014 2120 0001 4209 6670 |
Danielle Duncan |
| 4/8/2016 |
Document, Report, or Work plan Review - other |
Rec'd Nortech's work plan to conduct air and groundwater sampling yesterday and conditionally approved it today. Added that the ADEC vapor intrusion guidance documents be followed to allow the ADEC and HHS to determine the level of potential risk due to PCE and TCE vapor intrusion. |
Danielle Duncan |
| 4/20/2016 |
Update or Other Action |
Consultant performed the structural analysis and IAQ sampling using summa canisters . We’re expecting to see results later this week and expecting monitoring wells to be installed May 3/4.
|
Danielle Duncan |
| 5/19/2016 |
Document, Report, or Work plan Review - other |
Rec'd the Indoor Air Quality Testing report this date, preliminary, no lab data provided, but no detections of PCE or TCE in indoor air. |
Danielle Duncan |
| 6/9/2016 |
Document, Report, or Work plan Review - other |
Rec'd the completed Site Assessment Report this date. |
Danielle Duncan |
| 6/23/2016 |
Site Characterization Report Approved |
Sent report approval letter this date for Site Assessment Report 2092 Jordan Ave Building Suite 595 Nugget Mall. Indoor air was sampled and no PCE or TCE was detected in the air. Soil boring and groundwater samples indicated both were contaminated with dry cleaning solvent. A soil sample collected from outside the building the near the former location of the dry cleaning machine had a PCE concentration of 0.106 mg/kg which is above the ADEC cleanup level for migration to groundwater of 0.024 mg/kg. This value (0.106), although it is below the direct contact cleanup level for PCE of 21 mg/kg, it is 5 times higher than the cleanup level for migration to groundwater indicating a significant source of PCE in the soil. The groundwater monitoring well in the same location had a 1,2-DCE concentration of 0.0792 mg/L which is greater than the cleanup level of 0.07 mg/L. 1,2-DCE is a breakdown product of both PCE and TCE. This same well also had detections of PCE, TCE, toluene, and trans-1,2-DCE that were below ADEC cleanup levels. The contamination appears to be located on the east side of the building where the dry cleaning machine was located. |
Danielle Duncan |
| 9/16/2016 |
Update or Other Action |
Rec'd a phone call from an environmental consultant and discussed further air testing and potentially soil gas sampling on site. |
Danielle Duncan |
| 9/29/2016 |
Site Characterization Workplan Approved |
Received a copy of the work plan submitted by ERG on 9/27/16 and approved this date. The plan outlines soil gas, indoor and outdoor air, sub-slab, soil, and groundwater sampling for CVOCs and VOCs. |
Danielle Duncan |
| 10/21/2016 |
Document, Report, or Work plan Review - other |
Approved a work plan to install a soil vapor extraction system on site to remediate solvent contaminated soils on site. |
Danielle Duncan |
| 11/21/2016 |
Update or Other Action |
Spoke to the consultant - the soil vapor extraction system is up and running and I should have a report in the next couple weeks. |
Danielle Duncan |
| 1/17/2017 |
Site Characterization Report Approved |
Approved the Remedial Investigation and Soil Vapor Extraction System Installation Report this date. Conclusions:
1. Soil vapor contamination is towards Nugget Mall to the east and risks to indoor air are present at this time within the west side of Nugget Mall (JoAnne Fabrics) and Suite 595 in the annex building.
2. Groundwater contamination is following a water pipeline moving southwest instead of the direction of groundwater flow (groundwater flow is to the southeast).
3. In groundwater and soil vapor, daughter products of dechlorination have been detected along the outer margins of the contamination plume.
4. Screening level exceedances do not extend beyond the annex building and JoAnne Fabrics within Nugget Mall.
5. The site is currently capped with asphalt and the City of Juneau supplies municipal drinking water. There are no known drinking water wells near the site.
6. The soil contamination above ADEC cleanup levels appears to be limited to the area adjacent to the annex building.
7. Contaminated groundwater does not appear to pose a vapor intrusion risk.
8. A soil vapor extraction (SVE) system has been installed and is operational.
9. No air samples have tested above screening levels. |
Danielle Duncan |
| 2/2/2017 |
Update or Other Action |
Rec'd new soil vapor data and the SVE system appears to be having a positive effect and will remain running. |
Danielle Duncan |
| 2/6/2017 |
Update or Other Action |
Sent a letter today outlining future characterization and monitoring requirements. |
Danielle Duncan |
| 3/28/2017 |
Site Characterization Workplan Approved |
Approved a work plan to collect 5 grab water samples and potentially 5 soil samples to delineate the extent of groundwater contamination. |
Danielle Duncan |
| 8/16/2017 |
Update or Other Action |
The following tasks are proposed to be completed in the first/second weeks of September at the Nugget Mall:
• Indoor air sampling in the four suites as before.
• Grab GW sampling as outlined in the work plan submitted in March 2017.
• The 11 soil vapor wells will be sampled.
• GW monitoring of the 3 monitoring wells.
• Soil gas will be collected from sub-slabs SS1 through SS8 and SS13.
In addition, we will submit a comprehensive report that will include the SVE system installation and startup, O&M history, analytical results, and status history.
|
Danielle Duncan |
| 11/1/2017 |
Meeting or Teleconference Held |
Have had multiple teleconferences with both the consultant and Fairbanks staff regarding the contamination and data gaps. Currently awaiting a final report. The contaminated parcel will be left out of the pending sale of the property and cleanup will continue. |
Danielle Duncan |
| 1/26/2018 |
Document, Report, or Work plan Review - other |
According to the Site Investigation Report, prepared by Environmental Resource Group, Inc. on behalf of Resource Transition Consultants, LLC, dated December 2017, five borings were outfitted with polyvinyl screens and dedicated tubing and a peristaltic pump were used to collect five grab groundwater samples from one boring on the north end of the alleyway and four from south of the former dry-cleaning suite. The samples were analyzed for chlorinated VOCs. Samples were also collected from three groundwater monitoring wells (MW). Of the five grab groundwater samples, only D3 in Mallard Street had detectable contamination with cis-1,2-dichloroethene at 52 µg/L which is above the human health cleanup level. This data point suggests that the contamination has moved off-site towards Teal Street. The Teal Street area is commercial in nature without any known daycare facilities or residential housing.
Of the three groundwater MW sampled, only MW1 located near the former footprint of the dry-cleaning machine had detectable contamination with cis-1,2-dichloroethene at 120 µg/L and vinyl chloride at 2.5 µg/L; both values are above ADEC cleanup levels. MW1 also had concentrations of trichloroethene and trans-1,2-dichloroethene below ADEC cleanup levels.
Conclusions
1. Chlorinated VOC contamination may have moved off-site south across Mallard Street towards Teal Street as evidenced by sample D3 collected at or near Mallard Street. Submit a work plan for further groundwater contamination plume delineation in this area.
2. Provide the ADEC with a soil vapor extraction (SVE) system update.
3. Regarding the recommendation of site-specific cleanup levels for groundwater, please note that this will require a formal risk assessment and coordination with the ADEC risk assessor. |
Danielle Duncan |
| 8/3/2018 |
Update or Other Action |
The property transfer to Columbia Pacific Advisors should be final in 30 days. |
Danielle Duncan |
| 8/9/2018 |
Potentially Responsible Party/State Interest Letter |
Sent PRP letter today to Columbia Pacific Advisors as they have received the property. |
Danielle Duncan |
| 11/16/2018 |
Site Characterization Workplan Approved |
Approved the Ground Water Plume Delineation Work Plan The Nugget Mall – Annex Building this date. Three borings will be drilled using direct push technology across Mallard Street south of the Nugget Mall property. These will be completed as groundwater monitoring wells, sampled, and analyzed for volatile organic compounds (VOCs). Three other onsite wells will also be sampled. |
Danielle Duncan |
| 4/17/2019 |
Site Characterization Report Approved |
Approved the Ground Water Plume Delineation Investigation Report prepared by Environmental Resource Group, Inc. on behalf of Columbia Pacific Advisors, dated February 2019. The ADEC concurs that no further delineation of the CVOC plume in ground water is warranted. The groundwater contamination appears to be contained on site with a small portion of the plume extending below Mallard Street. The volume of soil above cleanup levels limited to the former footprint of the dry cleaning machine and has been delineated. The current data indicates that groundwater contamination above ADEC cleanup levels exists in MW-1 only (located nearest the source). |
Danielle Duncan |
| 5/28/2019 |
Workplan Requested |
Requested a work plan to turn the SVE system off and sample the groundwater (MW1) and sub-slab soil gas 6 weeks later. Please note that once a stable or decreasing groundwater contamination trend in MW1 located near the source can be established and soil vapor is no longer a risk to indoor air, final indoor air data may be required to support site closure. |
Danielle Duncan |
| 9/9/2019 |
Site Characterization Workplan Approved |
Approved the Work Plan for System Shut Off and Sub-Slab Sampling/MW-1 Sampling this date. Both groundwater and sub-slab soil gas will be sampled in support of site closure. |
Danielle Duncan |
| 2/27/2020 |
Document, Report, or Work plan Review - other |
Reviewed Letter Report regarding the most recent sampling event at Nugget Mall along with figure and tables detailing relevant soil vapor and groundwater analytical results. All results below target levels. Further monitoring planned. Requested additional details for this report. Ref file for more info. |
Joshua Barsis |
| 3/23/2020 |
Document, Report, or Work plan Review - other |
Reviewed the Ground Water and Sub-Slab Sampling Report, dated March 2020. The report documents the soil-gas sampling effort completed in November 2019 from 11 soil-gas points (SS1, SS3-SS6, and SS8-SS13)and one monitoring well (MW1). The soil-gas samples were submitted for analysis of TO-15 and the water sample for VOCs. All results for soil-gas samples were below ADEC vapor intrusion screening levels (PCE up to 1,700 µg/m3). In the monitoring well, concentrations of TCE and DCE decreased from 2017, while the concentration of vinyl chloride increased (above ADEC Table C level). The report notes that the increase is because of de-chlorination. Report recommendations include: The rebound test be continued to 9 months by keeping the SVE system shut down through May 2020. Collect soil vapor samples from SS1, SS3-SS6, and SS8-SS13 and a ground water sample from MW-1 to assess rebound and well as seasonal variability; then evaluate for closure. In an email (in the file) ADEC generally concurred, except that additional monitoring is likely required beyond the recommendations in the report. |
Joshua Barsis |
| 4/20/2021 |
Document, Report, or Work plan Review - other |
On April 20, 2021 ADEC received "GROUND WATER AND SUB-SLAB SAMPLING REPORT The Nugget Mall – Annex Building' dated March 2021. The report summarizes soil vapor and groundwater results. |
Rachael Petraeus |
| 5/18/2021 |
Meeting or Teleconference Held |
On May 18, 2021 ADEC participated in a teleconference with the RP and consultants to discuss lab samples being sent to a non-approved ADEC CS laboratory and discuss and clarify ADEC comments. |
Rachael Petraeus |
| 10/20/2021 |
Document, Report, or Work plan Review - other |
On October 20, 2021 ADEC received "WORK PLAN FOR SYSTEM SHUT OFF AND GROUND WATER/SUB-SLAB SAMPLING" dated September 2021. The work plan proposes collecting groundwater and sub-slab soil gas after shutting down the
SVE system in order to evaluate the Site for closure. In addition, assess the effectiveness of the remediation performed to date by the soil vapor extraction system, assess the stability and risks of the soil vapor quality following the cessation of soil vapor extraction, and assess the stability and risks of concentrations in groundwater. |
Rachael Petraeus |
| 11/10/2021 |
Meeting or Teleconference Held |
On November 10, 2021 ADEC participated in a teleconference with the RP and consultants to discuss and clarify ADEC comments and if the waste created has had a RCRA determination. At this time there is no documentation, consultant will follow-up. |
Rachael Petraeus |
| 1/21/2022 |
Meeting or Teleconference Held |
Meeting with Colubmia Pacific, consultant, and EPA to discuss how the consultant is dealing with RCRA waste generated on site. |
Lisa Krebs-Barsis |
| 2/17/2022 |
Update or Other Action |
ADEC email to request update on management of F-listed waste and revision of the October 2021 work plan. |
Lisa Krebs-Barsis |
| 4/7/2022 |
Site Characterization Workplan Approved |
The ADEC approved the "Work plan for System Shut Off and Groundwater/ Sub-Slab Sampling - Revised" Report. |
Flannery Ballard |
| 6/7/2022 |
Offsite Soil or Groundwater Disposal Approved |
The ADEC approved the transport of 15 gallons of piezometer purge water to Clean Harbors, who will send the waste for disposal at the Grassy Mountain Landfill facility in Clive, UT. The waste is contaminated with vinyl chloride and 1,2-DCE above cleanup levels and will be manifested as F-listed RCRA hazardous waste. |
Flannery Ballard |
| 7/21/2022 |
Document, Report, or Work plan Review - other |
ERG submitted "Groundwater & Sub-Slab Sampling Report" which summarizes the field events of April 2022. The ADEC is reviewing the report. |
Flannery Ballard |
| 8/4/2022 |
Document, Report, or Work plan Review - other |
The ADEC reviewed the "Ground water and Sub-Slab Sampling Report", submitted to the department on July 20, 2022. The ADEC is requesting revisions to the report before it is re-submitted for approval. |
Flannery Ballard |
| 9/27/2022 |
Site Characterization Report Approved |
The ADEC approved the July 2022 "Ground Water and Sub-Slab Sampling Report" which documented the April 2022 groundwater and sub-slab sampling event, 7 months after the the SVE system was shut off for the second time. All COCs were below ADEC target levels for vapor intrusion in the sub-slab samples, but vinyl chloride (42.9 ug/L)exceeded both groundwater cleanup levels (0.19 ug/L) and target levels for vapor intrusion in groundwater (25 ug/L).
The ADEC has requested an additional round of sampling before deciding on whether the SVE system can be shut off.
|
Flannery Ballard |
| 5/15/2023 |
Document, Report, or Work plan Review - other |
The DEC provided comments in response to the "Environmental Conditions Report", dated March 2023. |
Flannery Ballard |
| 1/12/2024 |
Document, Report, or Work plan Review - other |
The DEC provided comments in response to the "Environmental Conditions Report", received September 2023. |
Lisa Krebs-Barsis |
| 1/16/2024 |
Meeting or Teleconference Held |
Meeting to discuss path forward. Additional characterization needed across Mallard Street. Followed up by providing a copy of the covenant template, but cautioned the site is not yet ready for closure. |
Lisa Krebs-Barsis |
| 4/2/2024 |
Site Characterization Workplan Approved |
A work plan was conditionally approved for installation of MW4 across Mallard Street near the previous sample D3. MW4 and MW1 will be sampled for VOC. |
Lisa Krebs-Barsis |
