| Action Date |
Action |
Description |
DEC Staff |
| 7/28/1989 |
Update or Other Action |
Harding Lawson Associates (HLA) conducted a preliminary hazardous material site assessment in 1989, prior to the purchase of the property by the Municipal of Anchorage. HLA identified the underground storage tanks (UST’s) and a container storage area as potential sources of contamination. Results from the Phase I provided conclusions that the potential for petroleum hydrocarbons and/or hazardous substances from on-site sources to have impacted soil and/or groundwater on the property were moderate to high. During the Phase 2 Site Assessment, HLA drilled six borings at the site: one near the container area, three near the UST’s, and two along the northern edge of the property. The boring was completed as monitoring wells (MW-1 to MW-6). Maximum concentration reported in soil samples were 1,600 mg/kg TPH. This is above the 100 mg/kg TPH action level established by ADEC. A maximum concentration of 0.590 mg/L benzene, 0.001 mg/L toluene and 1.770 mg/L xylene was reported in the groundwater. These are above the State and Federal Drinking Water Standards of 5 µg/L benzene, 2,000 µg/L, toluene and 440 µg/L xylene. |
Beatrice Egbejimba |
| 8/2/1993 |
Update or Other Action |
In 1993, Harding Lawson Associates (HLA) conducted subsurface investigations at three Municipal Light & Power sites located at 1120 East First Avenue, 1121 East First Avenue and 1201 East First Avenue. Soil and groundwater samples were collected from the container storage area in 1120 East First Avenue. Results indicated that a maximum concentration of 6900 TPH was present in the soil at the container storage area. Groundwater obtained from MW-3 indicated the presence of 0.160 mg/l arsenic, 0.080 mg/l chromium and < 1 vinyl chloride. |
Beatrice Egbejimba |
| 8/12/2002 |
Meeting or Teleconference Held |
Meeting with Lena Savile of M L & P to discuss the status of the site. |
Amanda Dreyer |
| 8/12/2002 |
Meeting or Teleconference Held |
Meeting with Lena Savile of M L & P to discuss the status of the site. |
Beatrice Egbejimba |
| 8/14/2002 |
Update or Other Action |
ADEC send letter to Lena Savile of M L& P with a request to continue monitoring MW-3, MW-4, MW-5 and MW-6 for metals (arsenic, chromium, and lead). |
Beatrice Egbejimba |
| 8/20/2002 |
Document, Report, or Work plan Review - other |
ADEC letter following up meeting of August 12, 2002 by providing information on cleanup levels for multiple ML&P sites including this one and granting permission as requested during the meeting to sample the monitoring wells for this site. |
Amanda Dreyer |
| 8/20/2002 |
Document, Report, or Work plan Review - other |
ADEC letter following up meeting of August 12, 2002 and grants permission as requested during the meeting to sample the monitoring wells. |
Amanda Dreyer |
| 8/28/2002 |
Document, Report, or Work plan Review - other |
ADEC approved a work plan dated August 27, 2002 titled "Work Plan for Groundwater Monitoring at 1120 E. 1st Ave.". Plan proposes sampling monitoring wells MW-3, MW-4, MW-5 and MW-6 for metals (arsenic, chromium and lead). |
Amanda Dreyer |
| 10/25/2002 |
Update or Other Action |
ADEC received "September 2002 Groundwater Monitoring at 1120 E. 1st Avenue" described as the ML&P Customer Service area but is the same as the former storage area. Groundwater sampling and analysis of samples collected from MW-3, MW-4, MW-5 and MW-6 took place on September 12, 2002, with analysis done only for metals by EPA 200.8. Results were considered equivalent to background levels. |
Amanda Dreyer |
| 11/15/2002 |
Document, Report, or Work plan Review - other |
ADEC letter issued "Request for Corrective Action at the Container Storage Area". Additional work was requested based on a review of Harding Lawson Associates' report titled "Phase II Remedial Investigation for the Munciipal Light and POwer Facilities in Anchorage, AK" dated August 2, 1993. The letter requests that MW-3 be sampled for DRO, RRO, GRO and VOCs by January 30, 2003, and that a Corrective Action Plan be submitted by January 1, 2003. |
Amanda Dreyer |
| 12/18/2002 |
Update or Other Action |
ADEC received a work plan "Additional Environmental Assessment for the Container Storage Area" dated December 27, 2002. |
Amanda Dreyer |
| 3/25/2003 |
Update or Other Action |
ADEC sent letter approving ML&P's March 2003 "Additional Environmental Assessment of the Container Storage Area" report. The report provided information regarding the installation of two monitoring wells (MW-7 and MW-8). Results obtained from these wells indicated that only Vinyl Chloride exceeded ADEC's Table C cleanup level of 0.002 mg/L. A maximum concentration of 0.00575 mg/L was reported. ADEC therefore requested quarterly monitoring of MW-3, MW-7and MW-8. |
Beatrice Egbejimba |
| 3/25/2003 |
Update or Other Action |
ADEC sent letter approving ML&P's March 2003 Additional Environmental Assessment report. The report provided information regarding the installation of two monitoring wells (MW-7 and MW-8). Results obtained from these wells indicated that only Vinyl Chloride exceeded ADEC's Table C cleanup level of 0.002 mg/L. A maximum concentration of 0.00575 mg/L was reported. ADEC therefore requested quarterly monitoring of MW-3, MW-7and MW-8. |
Beatrice Egbejimba |
| 6/17/2003 |
Update or Other Action |
"Work Plan for Groundwater Monitoring" dated June 17, 2003 received in response to March 25, 2003 letter by staff Amanda Dreyer; plan states that groundwater sampling of wells MW-3, MW-7 and MW-8 will be conducted quarterly June 2003 through June 2004, and that groundwater level will be measured and samples analyzed for DRO, RRo and VOCs by EPA Method 8021/8260B. |
Eileen Olson |
| 9/17/2003 |
Update or Other Action |
ADEC received results of ML&P's June 2003 Groundwater monitoring event, the first of 4 quarterly events planned. Analytical results indicated that vinyl chloride was the only contaminant of concern (that is, contaminant exceeding cleanup levels). A maximum concentration of 0.00501 mg/L was reported. ADEC's Table C cleanup level is 0.002 mg/L. |
Beatrice Egbejimba |
| 9/17/2003 |
Update or Other Action |
ADEC received results of ML&P's June 2003 Groundwater monitoring event, the first of 4 quarterly events planned. Analytical results indicated that vinyl chloride was the only contaminant of concern (that is, contaminant exceeding cleanup levels) and only in MW-7. A maximum concentration of 0.00501 mg/L was reported. ADEC's Table C cleanup level is 0.002 mg/L. |
Beatrice Egbejimba |
| 9/17/2003 |
Update or Other Action |
ADEC received ML&P's "June 2003 Groundwater Monitoring" report dated September 8, 2003 for the first of the 4 scheduled quarterly events. Analytical results indicated that vinyl chloride was the only contaminant of concern (that is, contaminant exceeding cleanup levels). A maximum concentration of 0.00501 mg/L was reported. ADEC's Table C cleanup level is 0.002 mg/L. |
Beatrice Egbejimba |
| 11/5/2003 |
Update or Other Action |
ADEC received "September 2003 Groundwater Monitoring at the Container Storage Area" letter report with results of ML&P's groundwater monitoring event, the second of 4 quarterly events planned. Analytical results indicated that vinyl chloride was the only contaminant of concern (that is, contaminant exceeding cleanup levels) in one of the three wells monitored, MW-7. A maximum concentration of 0.00379 mg/L was reported. ADEC's Table C cleanup level is 0.002 mg/L. |
Eileen Olson |
| 11/19/2003 |
Site Added to Database |
Petroleum and hazardous substances. |
Beatrice Egbejimba |
| 11/20/2003 |
Site Ranked Using the AHRM |
Initial ranking. |
Beatrice Egbejimba |
| 1/5/2004 |
Update or Other Action |
ADEC received results of ML&P's September 2003 Groundwater monitoring event. Analytical results indicated that vinyl chloride was the only contaminant of concern. A maximum concentration of 0.00379 mg/L was reported. |
Beatrice Egbejimba |
| 1/27/2004 |
Record of Decision |
The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC), reviewed the September 2003 Groundwater Monitoring report prepared by ML&P. Based on the review of the report and file information, a Record of Decision was prepared for the above referenced site that establishes cleanup levels and the determination that further remedial action is not required subject to site specific conditions and/or requirements. The conditions include the requirement to obtain prior ADEC approval for any transport of soil and/or groundwater from the site and the need for groundwater monitoring in July every two years. The approved June 17, 2003 groundwater monitor plan is sufficient and the change in frequency will be noted in the ADEC database. |
Beatrice Egbejimba |
| 1/27/2004 |
Cleanup Level(s) Approved |
ADEC has reviewed the soil and groundwater information collected at the container storage area at the ML&P site on 1120 East 1st Avenue. Based on the information presented to date, the soil cleanup levels approved for this site are the 18 AAC 75.341 Method Two (Under 40 Inch Zone) migration to groundwater. The groundwater cleanup levels appropriate for this site are the 18 AAC 75.345 Table C levels. |
Beatrice Egbejimba |
| 1/27/2004 |
Institutional Control Record Established |
1. The soil (836 mg/kg DRO) above the 18 AAC 75.341 Table B1 and B2 migration to groundwater cleanup levels exceeded the site cleanup levels of 250 mg/kg DRO but it is considered minor in extent. It does not pose a risk to human health because it is less than the ingestion and inhalation standards for this area and the groundwater does not appear to be impacted. The paved surface area also acts as a barrier and reduces risk.
2. Vinyl chloride still exists above 18 AAC 75.345 Table C levels requiring groundwater monitoring until a stable or decreasing trend in concentrations is established. It is recommended the a July 2004 groundwater monitoring event should be conducted to verify current water quality conditions. Based on the 2004 results, the frequency of sampling in the future will be determined. |
Beatrice Egbejimba |
| 1/27/2004 |
Conditional Closure Approved |
ADEC reviewed the site information collected to date and evaluated the soil cleanup activities. Based on the information presented above, it is the Department’s determination that no further remedial action is required at this site. This determination is based on the following conditions:
1. The soil (836 mg/kg DRO) above the 18 AAC 75.341 Table B1 and B2 migration to groundwater cleanup levels exceeded the site cleanup levels of 230 mg/kg DRO but it is considered minor in extent. It does not pose a risk to human health because it is less than the ingestion and inhalation standards for this area and the groundwater does not appear to be impacted. The paved surface area also acts as a barrier and reduces risk.
2. Vinyl chloride still exists above 18 AAC 75.345 Table C levels requiring groundwater monitoring until a stable or decreasing trend in concentrations is established.. It is recommended the a July 2004 groundwater monitoring event should be conducted to verify current water quality conditions. Based on the 2004 results, the frequency of sampling in the future will be determined.
3. An institutional control (established on the ADEC database) will identify the nature and extent of contamination remaining on site. This information is intended to inform any future owners/operators of the environmental status of the property so they are aware of environmental and/or safety requirements.
4. If future information indicates that contamination is present at levels that may pose a risk to human health or the environment, then additional investigative and/or cleanup action may be required.
5. The transport of soil or groundwater from this site requires prior ADEC approval in accordance with 18 AAC 75.325(i). |
Beatrice Egbejimba |
| 2/3/2004 |
Update or Other Action |
File number changed from CS 69.09CSA to 2100.38.326. |
Sarah Cunningham |
| 2/27/2004 |
Update or Other Action |
File number changed from 2100.38.326 to 2100.38.385. |
Sarah Cunningham |
| 10/10/2006 |
Document, Report, or Work plan Review - other |
ADEC received "July 2006 Groundwater Monitoring at the Container Storage Area" letter report dated October 4, 2006. Vinyl chloride was the only contaminant of concern, exceeding cleanup levels in MW-3 and MW-7 with respective concentrations of 0.009 mg/L and 0.00749 mg/L as compared to the ADEC Table C cleanup level of 0.002 mg/L. The report includes a discussion of 2004 sample results and draws the conclusion, which ADEC concurred with, that sample results for MW-7 and MW-8 (the latter an upgradient well) for the 7/13/2006 sampling event had been switched, as it was the only event for which MW-8 exceeded cleanup levels for vinyl chloride and the only event for which MW-7 did not exceed cleanup levels for vinyl chloride. |
Eileen Olson |
| 10/10/2006 |
Document, Report, or Work plan Review - other |
Entered on 1/24/13 when doing a QC check on the database information for this site. Groundwater monitoring was completed in July 2006. All contaminants were either non-detect or below cleanup levels except for vinyl chloride. |
Evonne Reese |
| 10/2/2008 |
Update or Other Action |
ADEC received "July 2008 Groundwater Monitoring at the Container Storage Area" report for sampling of MW-3, MW-7 and MW-8 on July 10, 2008. Vinyl chloride levels in MW-3 and MW-7 were respectively 0.00668 mg/L and 0.00546 mg/L, exceeding the cleanup level of 0.002 mg/L. MW-8 results were below the cleanup level; vinyl chloride was positively identified but the concentration was above the MDL but below the PQL. The report conculuded that the 2008 vinyl chloride concentrations in all three wells indicate a decrease from the previous sampling event in 2006. |
Eileen Olson |
| 10/2/2008 |
Update or Other Action |
ADEC received "July 2008 Groundwaer Monitoring at the Container Storage Area" report. |
Eileen Olson |
| 9/20/2012 |
Update or Other Action |
Staff changed from Eileen Olson to IC Unit. |
Kristin Thompson |
| 10/1/2012 |
Update or Other Action |
Staff name changed to Eileen Olson so that she can make updates needed to the site record. |
Evonne Reese |
| 10/23/2012 |
Institutional Control Compliance Review |
IC review conducted, hard file reviewed, groundwater monitoring results scanned in order to update the database record. The reminder system was initialized. |
Evonne Reese |
| 1/28/2013 |
Document, Report, or Work plan Review - other |
Reviewed the report titled “August 2012 Groundwater Monitoring” received on 1/23/2013. Monitoring wells MW-3, MW-7, and MW-8 were sampled on August 6, 2012. MW-3 and MW-7 have exceeded the cleanup levels for vinyl chloride in almost all events since 2002, although MW-3 was the only well with vinyl chloride concentrations above the 0.002 mg/L cleanup level at 0.00321 mg/L for the August 6, 2012 event. Concentrations of DRO and RRO have been below cleanup levels since sampling was initiated in 2002. Approval was given for sampling in 2014 to exclude DRO and RRO from the analysis. Future sampling analysis should be limited to vinyl chloride. Note that the previous consultant concluded that the MW-7 non-detect result for vinyl chloride for the 7/13/2004 was in error, and that the vinyl chloride result for MW-8 (of 0.00605) had been switched with the MW-7 result. This is a reasonable conclusion given that it was the only monitoring event for which MW-8 exceeded cleanup levels for vinyl chloride and the only event for which MW-7 did not exceed cleanup levels for vinyl chloride. (See 10/10/2006 database entry). Future sampling analysis should be limited to vinyl chloride.
|
Evonne Reese |
| 2/25/2013 |
Update or Other Action |
Staff name changed from Eileen Olson to Bill O'Connell since Bill manages other ML&P sites on the same property. |
Evonne Reese |
| 1/1/2014 |
Update or Other Action |
Staff name changed from O'Connell to Lidren. This site will not be placed into the IC Unit name at this time so the ICs can be managed in conjunction with other ML&P sites. |
Evonne Reese |
| 1/28/2015 |
Site Characterization Report Approved |
On this date, ADEC received the June 2014 Groundwater Monitoring at the ML&P Former Container Storage Area, 1120 E. 1st Ave. submitted by SLR dated January 26, 2015. On June 26, 2014 groundwater samples were collected from MW-3, MW-7, and MW-8. Only MW-3 and MW-7 contained Vinyl Chloride above Table C cleanup levels up to 0.00307 mg/L. All other detectable VOCs were below ADEC Table C cleanup levels. |
Grant Lidren |
| 2/11/2015 |
Potentially Responsible Party/State Interest Letter |
On this date, ADEC sent a PRP letter to ML&P. |
Grant Lidren |
| 3/6/2017 |
Site Characterization Report Approved |
On this date, ADEC received the June 2016 Groundwater Monitoring at the ML&P Former Container Storage Area, 1120 E. 1st Ave. submitted by SLR dated January 26, 2015. On June 26, 2014 groundwater samples were collected from MW-3, MW-7, and MW-8. Only MW-3 and MW-7 contained Vinyl Chloride above Table C cleanup levels up to 0.00222 mg/L. All other detectable VOCs were below ADEC Table C cleanup levels. The next sampling event will be in 2018. |
Grant Lidren |
| 2/27/2018 |
Update or Other Action |
On this date, ADEC received a copy on the Notice of Environmental Contamination (NEC). This NEC was recorded with DNR for the ML&P Former Storage property deed to notify current and future property owners of residual onsite soil and groundwater contamination. |
Grant Lidren |
| 3/1/2018 |
Institutional Control Update |
Groundwater monitoring is no longer required at this site. The monitoring wells need to be decommissioned in accordance with ADEC guidance. |
Grant Lidren |
| 7/31/2018 |
Document, Report, or Work plan Review - other |
ADEC received and approved the Work Plan for Monitoring Well Decommissioning at the ML&P Former Container Storage Area submitted by SLR and dated July 31, 2018. |
Grant Lidren |
| 10/16/2018 |
Document, Report, or Work plan Review - other |
Received and reviewed the Report for Monitoring Well Decommissioning at the ML&P Former Container Storage Area; 1120 East First Avenue, Anchorage, Alaska (Hazard ID: 619). This report was submitted by SLR and dated October 15, 2018. Monitoring wells MW-3 CS, MW-7 CS, and MW-8 CS were decommissioned by removing the surface monuments, removing the entire well casings using the drill rig’s wireline, and then backfilling the boreholes with bentonite. Each of the three well casings was pulled from the well as one complete piece (i.e., the casing did not break during removal), although the bottom plug remained in the each well. Bentonite chips were poured into the open boreholes until near the ground surface. The bentonite chips were poured in the casing slowly, in order to prevent bridging (by periodically monitoring the fill level). The bentonite chips were hydrated incrementally with potable water. The remaining portions of the boreholes were filled with sand and/or gravel. The surface monuments were removed and resulting voids backfilled to grade. Asphalt was re-patched to match surrounding grade using “cold patch”. |
Grant Lidren |
| 11/2/2018 |
Institutional Control Compliance Review |
IC compliance review conducted. Reminder system set up for 5 yr cycle. |
Mossy Mead |
| 6/10/2024 |
Institutional Control Compliance Review |
IC compliance review completed on this date. An IC reminder letter was issued to the landowner. The next review will be in five years’ time. |
Gaige Robinson |
| 6/18/2024 |
Institutional Control Update |
The landowner responded to the IC reminder letter and provided a written confirmation that land use has not changed |
Gaige Robinson |
| 9/3/2025 |
Institutional Control Update |
Responded to a request to move soil offsite that is taken from a driveway ramp in the vicinity of this site. This soil is not related to any contaminated soil remaining from this site's history. Another part of this project is approval of decommissioning groundwater wells MW-4, 5, & 6 which are believed to have been left in place from this site's history. |
Evonne Reese |
