| Action Date |
Action |
Description |
DEC Staff |
| 9/13/2004 |
Offsite Soil or Groundwater Disposal Approved |
Approval was given this date to transport between and estimated 100 to 140 tons of petroleum impacted soil to Alaska Soil Recycling for thermal treatment based on prior maximum sampling results of 16,400 ppm DRO, 112,000 RRO, 7.24 ppm Arsenic, 274 ppm barium, 2.14 ppm cadmium, 201 ppm total chromium, 38.5 ppm lead, and 1.22 ppm selenium, and 0.0982 ppm trichlorofluoromethane. Chromium TCLP resulted in ND leachable chromium. The soil is planned to be excavated based on prior characterization and the trucks used will be lined and tarped.
Action added by Petrik. |
David Pikul |
| 9/24/2004 |
Site Added to Database |
A screening level environmental assessment of the subject property in September 2002 identified potential environmental concerns at the site. Stained soil was observed in the vicinity of the end rolling equipment, a sump and discharge drain associated with the end rolling equipment, and an asphalt dip tank.
Comments added by Petrik. |
Sarah Cunningham |
| 1/9/2005 |
Site Characterization Report Approved |
Received a copy of the Shannon & Wilson, Inc. "Limited Phase II Environmental Assessment, 111 East 100th Avenue, Anchorage, Alaska" dated March 2003. Nine soil borings were advanced on 2/19/03 and borings B5 through B9 were finished as monitoring wells.
12 soil samples were collected and analyzed for GRO, DRO, RRO, and VOCs. There were only two samples that exceeded the cleanup levels, both for DRO - the sump sample was 8,950 mg/kg the and Sample Drain 1 was 284 mg/kg.
Only one GW sample exceeded any cleanup level - 1.59 mg/L DRO which was attributed a high bias due to sedimentation effects from the well it was sampled from not being developed enough.
Temporary monitoring wells indicated that groundwater ranged between 7.5 and 10 feet below the ground surface (bgs) on the date of drilling (2/19/03) and between 6.8 to 9 feet bgs on 2/20/03.
Hydraulic fluid is attributed to the hydrocarbon contamination at the site and the report recommended a work plan be developed to excavate and thermally remediate this impacted soil. |
Bill Petrik |
| 11/21/2005 |
Site Characterization Report Approved |
Received a copy of the Shannon & Wilson, Inc. "Excavation Sampling, 111 East 100th Avenue, Anchorage, Alaska" dated 10/22/04 and received 10/25/04. On 9/15/04, 168.14 tons of material was excavated after the end rolling equipment was removed, placed directly into trucks, and transported to Alaska Soils Recycling. New end rolling equipment replaced the old on a concrete slab.
Following receipt of analytical results the excavation was backfilled. GRO, DRO, RRO, VOCs, RCRA Metals, and TCLP Chromium analyses were made of samples. The only exceedance of the cleanup level in the excavation was Sample SS4 from the western end of the excavation which was 644 mg/kg DRO. GW is ~7' bgs. Further excavation in this area was not conducted due to the presence of a buried fiber optic cable. All samples exceeded the RCRA Chromium cleanup level of 26 mg/kg. The report concluded that the range of values for chromium resulting from sampling, 29.3 mg/kg to 201 mg/kg, were within the realm of naturally occurring levels for the area. The drain discharge area was scheduled for excavation and removal in Spring 2005. |
Bill Petrik |
| 5/20/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed. |
Bill Petrik |
| 9/10/2010 |
Update or Other Action |
The CSP reviewed the site file and sent a letter to the responsible party. Three areas of concern (AOC) with either soil and/or GW contamination above the migration to GW soil and GW cleanup levels remain at the site. The CSP letter sent outlined specific issues at these AOCs. The CSP made numerous requests in the letter:
1) a copy of the Method Blank laboratory analytical results for specific work for further review to determine whether methylene chloride was a lab contaminant for the analytical results or not.
2) The letter also requested submittal to the CSP for review and its file records a copy of the Alaska Soil Recycling (ASR) post-treatment sampling results for soil excavated in 2004 that was transported to ASR and thermally remediated.
3) the location and circumstances surrounding copies of laboratory results of soil samples analyzed for PCBs and RRO collected 6/10/05 that are located in the site file; and
4) a completed CSM for the site to be submitted with the responsible party's next response to the CSP.
The letter also included cost recovery verbiage. |
Bill Petrik |
| 9/27/2010 |
Update or Other Action |
The CSP received a carbon copy of a letter from the Law Office of John M. Miller, LLC to Contech Construction Products, Inc. in response to the CSP letter dated 9/10/10 sent to Contech. Miller is representing the owner of the land that Contech is leasing from who is also the owner of a much larger parcel to the west and north. The Miller letter deduced contamination moving off the Contech site onto Miller's client's land. The Miller letter also requested soil sampling and groundwater monitoring along the western and northern boundaries of the Contech lease lot. |
Bill Petrik |
| 11/12/2010 |
Update or Other Action |
Received a letter from Jill Weller, attorney for the site. Updated the address from 111 East 100th Avenue to 111 West 100th Avenue and the name from Contech and Culfabco to Contech Construction Products Inc. |
Bill Petrik |
| 11/26/2010 |
Update or Other Action |
Sent a letter this date to Jill Weller, attorney for the site, in response to her 11/12/10 letter and the Shannon & Wilson, Inc. "Site Characterization Work Plan, 111 West 100th Avenue, Anchorage, Alaska, File Number 2100.38.435; Hazard ID 4075" dated 11/11/10. Conditionally approved the work plan. See the file copy of the letter for further details. |
Bill Petrik |
| 1/25/2011 |
Update or Other Action |
Received a letter from Jill Weller, attorney for the site, dated 1/18/11 and a Shannon & Wilson, Inc. "Revised Site Characterization Work Plan, 111 West 100th Avenue" dated 1/13/11. |
Bill Petrik |
| 1/31/2011 |
Document, Report, or Work plan Review - other |
Reviewed a letter from Jill Weller, attorney for the site, dated 1/18/11, received 1/25/11. The letter addressed requests and issues in the 11/26/10 CSP letter. At the time of the 2003 sump sediment sample, the sump measured about 3' deep and 2' in diameter. The water level was ~1.3' bgs. An approximate 8" diameter pipe was located in the western portion of the sump. A sample was collected from ~4" of sediment that was present in this pipe. To address potential indoor air exposure, further evaluation of the sump area was proposed. A revised work plan was submitted to address these and other issues raised in the 11/26/10 CSP letter. |
Bill Petrik |
| 2/17/2011 |
Document, Report, or Work plan Review - other |
Reviewed a revised version of the Shannon & Wilson, Inc. "Revised Site Characterization Work Plan, 111 West 100th Avenue, Anchorage, Alaska; File Number 2100.38.435; Hazard ID 4075" dated 2/10/11. |
Bill Petrik |
| 3/24/2011 |
Site Characterization Workplan Approved |
Upon review of the Shannon & Wilson, Inc. "Revised Site Characterization Work Plan, 111 West 100th Avenue, Anchorage, Alaska" dated and received via email 2/10/11, the CSP sent a letter approving the work plan as written.
|
Bill Petrik |
| 11/17/2011 |
Document, Report, or Work plan Review - other |
DEC staff reviewed Shannon and Wilson's (S&W's) "Site Characterization Report", dated September 2011. S&W documented the evaluation of three areas of concern: The shop building floor sump, the end rolling equipment and a former asphalt dip tank, and the storm drain discharge area. The shop floor sump was tested and found to be water tight and samples collected from the base of the sump contained elevated levels of DRO (i.e. 376 mg/kg). Three soil borings (B10 through B12) were advanced near the rolling equipment and former ashphalt dip tank and two of the borings (B11 and B12) were completed as monitoring wells. The levels of TCE and methylene chloride in soil collected from boring B12 exceeded 18 AAC 75.342 Table B2 values. No contaminants of concern were detected in groundwater samples collected from either B11 or B12. At the former storm drain discharge area, soil had been removed at a prior date. To evaluate this soil, samples were collected from the excavation pit bottom and the stockpile to be analyzed for DRO, RRO, VOCs, and PAHs. No contaminants of concern exceeded DEC cleanup criteria; thus, the excavation area was backfilled with stockpiled soil and then a boring (i.e. B13) was advanced in this area to a depth of 8.5 feet below ground surface and completed as a monitoring well. RRO was detected at a level of 1.19 mg/L in groundwater collected from this well. Staff issued a letter to Ms. Weller on November 18, 2011 requesting she facilitate the submital of a site investigation work plan to the Department by January 31, 2012. |
Todd Blessing |
| 2/3/2012 |
Site Characterization Workplan Approved |
DEC staff reviewed and approved of Shannon and Wilson’s “Work Plan for Additional Site Characterization Activities, 111 West 100th Avenue, Anchorage, Alaska; ADEC File Number 2100.38.435”, dated January 13, 2012. Within the work plan, Shannon and Wilson, Inc. (S&W) proposed to advance three soil probes in the vicinity of Boring B12 utilizing a direct push drill rig. Soil samples will be collected from 1 to 3 feet below ground surface to be field screened and then analyzed for VOCs by EPA Method 8260B. In addition, groundwater samples will be collected from monitoring well B11MW to be analyzed for RRO by AK Method 103. |
Todd Blessing |
| 3/6/2012 |
Update or Other Action |
Staff reviewed a letter authored by attorney Jack Miller and addressed to Tellus, Ltd. Mr. Miller suggested that the detection of Camphor-related chemicals on the AEL Anchorage LLC property may be due to the spillage and runoff from the subject property when it was operated by Colfabco. |
Todd Blessing |
| 9/20/2012 |
Document, Report, or Work plan Review - other |
Staff reviewed Shannon and Wilson's "Additional Site Characterization Activities, 111 West 100th Avenue, Anchorage, Alaska". This report was dated August 27, 2012 and recieved at DEC's Anchorage Office on September 7, 2012. The report documented the results of aoil and groundwater sampling. Soil sampling near boring B12MW revealed no detections of VOCs above 18 AAC 75.341 Table B1 or B2 values suggesting TCE impacted soil is limited. Groundwater samples were collected from each momitoring well elevated levels of RRO in monitoring well B11MW. No other contaminants of concern were detected above regulatory criteria and groudnwater was determined to flow westerly. |
Todd Blessing |
| 9/20/2012 |
Site Characterization Workplan Approved |
Staff reviewed and approve of Shannon and Wilson’s (S&W's) “Work Plan for Additional Site Characterization Activities and Cleanup Activities, 111 West 100th Avenue, Anchorage, Alaska”. The work plan provides the means and methods to excavate and treat contaminated soil, and sample soil and groundwater. S&W will supervise the excavation of contaminated soil around Boring B12. Only 1 to 2 cubic yards is expected to be excavated. The contaminated soil will be disposed of at the Anchorage Regional Landfill (ARL). Following excavation activities soil samples will be collected in accordance with CSP guidance. A groundwater sample will also be collected from monitoring well B11MW and analyzed for RRO. |
Todd Blessing |
| 3/12/2013 |
Site Characterization Report Approved |
Reviewed S&W's December 20, 2012 "Additional Site Characterization and Removal Actions, 111 West 100th Avenue, Anchorage, Alaska." The report included a summary of an October 2012 soil excavation and groundwater sampling from Well B11MW.
Approximately 2.5 cubic yards (4.8 tons) of soil were excavated in October 2012 around Monitoring Well B12MW, in an area where TCE had previously been measured in soil at concentrations greater than the Table B1 cleanup level. Samples from the excavation base and sidewall were non-detect for TCE. Other VOC analytes were found at estimated (j-flagged) concentrations less than the Table B1 cleanup levels.
A groundwater sample collected from Well B11MW contained RRO concentrations (1.73 mg/l) greater than the ADEC Table C cleanup level. |
Jacob Gano |
| 5/21/2013 |
Update or Other Action |
Received a letter from Contech, dated May 6, 2013. In the letter, Contech requests that the DEC hold off making a closure determination until a sump located west of the shop building has been investigated. The letter includes copies of a lab report for a water sample collected from the sump by Shannon & Wilson in October 2012. The water sample contained concentrations of DRO and RRO which slightly exceed the 18 AAC 75.345 groundwater cleanup levels. |
Jacob Gano |
| 6/14/2013 |
Update or Other Action |
DEC sent a letter to Pam Wendt (landowner) discussing our data needs to close the sump. |
Jacob Gano |
| 11/15/2013 |
Document, Report, or Work plan Review - other |
ADEC approved the Sump Limited Investigation for the vertical corrugated metal pipe located outside at the 111 E 100th Street property. The water in the sump will be sampled first, and Emerald has been contracted to pump the estimated 670 gallons of water from the sump for treatment and disposal at their facility. A sediment/soil sample will be collected from the base and if the sump recharges, a second water sample will be taken when it has recharged to 20%. |
Meghan Dooley |
| 11/15/2013 |
Document, Report, or Work plan Review - other |
ADEC approved the Sump Limited Investigation for the vertical corrugated metal pipe located outside at the 111 E 100th Street property. The water in the sump will be sampled first, and Emerald has been contracted to pump the estimated 670 gallons of water from the sump for treatment and disposal at their facility. A sediment/soil sample will be collected from the base and if the sump recharges, a second water sample will be taken when it has recharged to 20%. |
Meghan Dooley |
| 12/18/2013 |
Site Visit |
ADEC conducted a site visit to observe water and soil sampling from the vertical corrugated metal pipe(VCMP). |
Meghan Dooley |
| 10/3/2014 |
Meeting or Teleconference Held |
ADEC met with the landowner to discuss the current site status, results of the VCMP sampling, and a path forward for the site. |
Meghan Dooley |
| 10/29/2014 |
Document, Report, or Work plan Review - other |
ADEC approved of the Groundwater Monitoring Work Plan, submitted on October 26, 2014. The work plan calls for sampling the four onsite wells for GRO, DRO, RRO and BTEX as well as collecting water quality parameters and determine hydraulic gradient. |
Meghan Dooley |
| 12/10/2014 |
Update or Other Action |
The EPA approved of the decommissioning plan for the Class V injection well (identified as vertical corrugated metal pipe in previous reports). |
Lisa Krebs-Barsis |
| 3/19/2015 |
Document, Report, or Work plan Review - other |
Approved of work plan to decommission monitoring wells B10MW and B12MW. Monitoring wells B11MW and B13MW will remain intact for future monitoring. |
Lisa Krebs-Barsis |
| 4/17/2015 |
Document, Report, or Work plan Review - other |
Monitoring Wells B10MW and B12MW were decommissioned in accordance with the approved work plan. |
Lisa Krebs-Barsis |
| 4/17/2015 |
Document, Report, or Work plan Review - other |
The vertical corrugated metal pipe, a Class V injection well, was decommissioned in accordance with a work plan approved by the EPA. |
Lisa Krebs-Barsis |
| 6/15/2016 |
Document, Report, or Work plan Review - other |
ADEC CS reviewed a proposed work plan to confirm cleanup criteria have been met. Work plan for 2016 was approved on 6-15-16. Sampling is expected to commence in July 2016. |
Darren Mulkey |
| 9/2/2016 |
Site Visit |
Site visit to confirm that monitoring well B11MW was undamaged. Sometime between the sampling effort conducted in 2015 and again in 2016 the B11MW well monument protector was filled with concrete. The well could not be sampled during the 2016 sampling event. The concrete was removed and it was discovered that the well and casing were not damaged. A subsequent sample of B11MW will be collected and incorporated into the 2016 monitoring report. |
Darren Mulkey |
| 12/7/2016 |
Document, Report, or Work plan Review - other |
Received and reviewed the 2016 groundwater monitoring report for this site. All sample results are below ADEC cleanup levels. Monitoring well B11MW and its duplicate were non-detect for RRO. |
Darren Mulkey |
| 12/21/2023 |
Site Reopened |
This site is being reopened to document efforts to address chromium VI contamination in soil and potential DRO contamination in groundwater that was identified during a Phase II and follow up assessment. |
Bill O'Connell |
| 12/21/2023 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 81365 name: Chromium VI in soil |
Bill O'Connell |
| 1/30/2024 |
Document, Report, or Work plan Review - other |
Work plan approved for additional characterization of soil and groundwater, Two boreholes will be advanced in areas where DRO exceeded the Table C groundwater cleanup level and chromium IV exceeded the soil migration to groundwater cleanup level. |
Bill O'Connell |
| 4/8/2024 |
Document, Report, or Work plan Review - other |
Reviewed Additional Site Characterization Activities Report. Activities included advancing two soil borings and collecting soil samples then completion of those borings as temporary groundwater monitoring wells to further characterize hexavalent chromium and DRO/RRO contamination in soil and groundwater. DRO and RRO were not detected in soil samples. Hexavalent chromium was detected in soil up to 0.164 mg/kg, above the migration to groundwater cleanup level of 0.089 mg/kg, but consistent with hexavalent chromium detections from previous samples at the site. DRO and RRO were detected in groundwater in MW24-1 above their cleanup levels. Hexavalent chromium was detected up 0.252 ug/l, below the Table C cleanup level of 0.35 ug/l. |
Bill O'Connell |
| 6/28/2024 |
Document, Report, or Work plan Review - other |
Reviewed work plan for additional site characterization at Contech. To further evaluate the presence of petroleum and chromium contamination in soil and groundwater, three boreholes will be advanced and completed as monitoring wells will be installed and sampled. Two soil samples will be collected from each borehole and analyzed for DRO, RRO, VOCs and PAHs, one sample from the GW interface and a second sample from the interval with the highest PID reading. Additionally. One sample will be collected from each borehole from 0-2 feet and analyzed for hexavalent chromium. The three newly installed wells, as well as existing well MW24-1 will be sampled for, DRO, RRO, VOCs and PAHs, and MW24-1 will also be analyzed for hexavalent chromium. |
Bill O'Connell |
