| Action Date |
Action |
Description |
DEC Staff |
| 11/6/1989 |
Release Investigation |
SI; Harding Lawson report concerning the removal of USTs and contaminated soils. High levels of soil contamination encountered at gasoline USTs and around waste oil UST fill pipe. Contaminated soils were selectively stockpiled. |
Former Staff |
| 11/6/1989 |
Update or Other Action |
REM; Statewide Petroleum Services removed 4 steel USTs. Excavated soils temporarily stockpiled on-site pending disposal. |
Former Staff |
| 1/5/1990 |
Site Characterization Report Approved |
ADEC received the Assessment Report Removal of Four Underground Storage Tanks 1201 East Third Avenue submitted by HLA and dated January 5, 1990. The four regulated USTs consisted of one 3,000 gallon diesel, one 1,500 gallon gasoline, one 2,000 gallon gasoline, and one 1,000 gallon waste oil. At the diesel tank, the tank was removed and four soil samples collected at a depth of 12 feet bgs contained TPH up to 420 mg/kg. The excavation was backfilled with excavated soil and broken remains of the concrete fuel island. At the gasoline tanks excavation, contaminated soils and the tanks were removed and four confirmation soil samples collected 8 feet bgs at the groundwater interface contained TPH up to 5,980 mg/kg, benzene up to 370 mg/kg, toluene up to 2,500 mg/kg, ethylbenzene up to 1,000 mg/kg and xylenes up to 4,500 mg/kg. At the waste oil tank, contaminated soil and the tank was removed and four confirmation soil samples collected 8 feet bgs at the groundwater interface contained TPH up to 15,800 mg/kg, benzene up to 3.5 mg/kg, toluene up to 28 mg/kg, ethylbenzene up to 66 mg/kg and xylenes up to 380 mg/kg. At both the gasoline tanks excavation and the waste oil tank excavation, contaminated soil was stockpiled on site, the excavations were limited due to the shallow groundwater table and the building foundation to the north, and they were backfilled with clean fill. |
Former Staff |
| 1/11/1990 |
Site Added to Database |
|
Former Staff |
| 1/11/1990 |
Underground Storage Tank Site Characterization or Assessment |
SA1R; |
Former Staff |
| 1/11/1990 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77893 ADD; |
Former Staff |
| 1/12/1990 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
LCAU; :LCAU Date changed DB conversion |
Former Staff |
| 9/17/1990 |
Leaking Underground Storage Tank Corrective Action Underway |
RAPR; ML&P plans to dispose of stockpiled soils at AS&G. ADEC approved 9/27/90. Need confirmation of disposal. |
Former Staff |
| 11/20/1990 |
Update or Other Action |
In 1990, an abandoned HOT was removed. Six soil samples collected contained TPH up to 470 mg/kg, tolune up to 0.140 mg/kg, ethylbenzene up to 0.056 mg/kg, and xylenes up to 0.320 mg/kg. |
Grant Lidren |
| 8/17/1991 |
Offsite Soil or Groundwater Disposal Approved |
Anchorage Sand and Gravel received 183.46 tons of fuel stained soils from 1201 East Third Avenue |
Former Staff |
| 8/2/1993 |
Site Characterization Report Approved |
ADEC received the Phase II Remedial Investigation Municipal Light and Power Facilities submitted by HLA and dated August 2, 1993. This report documented investigations at three ML&P sites: 1120 E 3rd ave, 1121 E 1st ave, and 1201 E 3rd Ave. At the 1201 E 3rd ave site, 14 soil borings were advanced and four were completed as monitoring wells. At the diesel UST, 1 boring was advanced and completed as a monitoring well. At the former HOT, three soil borings were advanced. At the former gasoline USTs and waste oil UST, 10 borings were advanced. Two monitoring wells were completed on the north of the building (assumed downgradient) and one was completed south of the building (assumed upgradient) of the former gasoline and waste oil USTs. At the former diesel tank, soil samples collected at 8.5 to 13 feet bgs contained TPH up to 16,000 mg/kg and EPH (DRO) up to 980 mg/kg. At the former HOT, soil samples collected at a a depth of 5.0 to 8 feet bgs from three borings contained TPH up to 13,000 mg/kg, and EPH(DRO) up to 3,900 mg/kg. At the gasoline tanks and waste oil excavation, soil samples collected at 3.0 to 9.5 feet bgs contained TPH up to 13,000 mg/kg, TRPH up to 15,000 mg/kg, VPH (GRO) up to 5,500 mg/kg, EPH (DRO) up to 12,000 mg/kg, benzene up to 11 mg/kg, toluene up to 160 mg/kg, ethylbenzene up to 61 mg/kg, and xylenes up to 500 mg/kg. Out of the four monitoring wells samples, only one (3MW02), analyzed for VOCs, contained benzene above cleanup levels at 5 ug/L. this MW is located downgradient of the former gasoline USTs and waste oil location. |
Former Staff |
| 7/15/1994 |
Update or Other Action |
CAPR; Contaminated Soil disposal plan |
Former Staff |
| 7/27/1994 |
Update or Other Action |
In 1994, groundwater samples were collected from monitoring wells MW3W2, MW6W2, MW7W2, and MW8W2. Down gradient wells MW3W2 and MW7W2 were ND. Downgradient MW6W2 contained detectable concentrations of contaminants, but below cleanup levels. Source area MW8W2 contained DRO at 10 mg/L and benzene at 3.0 mg/L. |
Former Staff |
| 10/14/1994 |
Update or Other Action |
Oh this date, a vapor extraction system, installed in the former gas tanks waste oil excavation, began continuous operation. During install of the system, a viscous oily product was observed in soil samples at 15 to 17 feet bgs. Addtionally, a previously unknown 3,000 gallon Fuel Oil UST was discovered and removed. Encountered contaminated soil at the UST were left in place. |
Former Staff |
| 11/4/1994 |
Update or Other Action |
Oh this date, an air sparge system, installed in the former gas tanks waste oil excavation, began continuous operation. During install of the system, a viscous oily product was observed in soil samples at 15 to 17 feet bgs. |
Grant Lidren |
| 12/21/1994 |
Leaking Underground Storage Tank Corrective Action Underway |
LCAR; System startup. |
Former Staff |
| 1/18/1995 |
Release Investigation |
RELR; Reviewed quarterly report. |
Former Staff |
| 1/19/1995 |
Leaking Underground Storage Tank Corrective Action Underway |
LCAR; Review report on soil disposal. |
Former Staff |
| 12/18/1995 |
Leaking Underground Storage Tank Corrective Action Underway |
LCAR; Reviewed a quarterly report. |
Former Staff |
| 11/20/1997 |
Update or Other Action |
ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: ANCHORAGE MUNICIPAL LIGHT/POWER |
Former Staff |
| 12/5/1997 |
Update or Other Action |
Proceeding with remediation.; Jim Pfeiffer; 263-5273 |
Former Staff |
| 9/29/1998 |
Update or Other Action |
from September 29th to December 2nd 1998, approximately five gallons of oily water were pumped from vapor extraction well VES-4 and disposed offsite. this is about how much oily water is removed on a quarterly basis. |
Former Staff |
| 3/1/2000 |
Update or Other Action |
Meeting with RP; May Revise VES |
Daniel Rogers |
| 3/2/2000 |
Update or Other Action |
Based off a review of the the file, the VES was discontinued sometime between 2000 and 2003. |
Grant Lidren |
| 2/5/2004 |
Document, Report, or Work plan Review - other |
ADEC sent a letter to Lena Savile of M L& P approving the September 2003, Groundwater Monitoring report for the maintenance facility located at 1201 E. 3rd Avenue, in Anchorage. Elevated levels of DRO, GRO and benzene were reported with a maximum concentration of 7.47mgl/ DRO, 14.1 mg/l GRO and 4.95 mg/l benzene. Continued groundwater monitoring was requested for all existing wells except MW-8. Groundwater monitoring frequency was reduced to one annual sampling event to be conducted during the month of June. |
Beatrice Egbejimba |
| 9/11/2006 |
Update or Other Action |
File number issued 2100.26.302 (FKA L69.07). |
Aggie Blandford |
| 12/12/2007 |
Update or Other Action |
Well search of the area showed no drinking water wells on the south side of Ship Creek. ETM ranking completed 11/30/07. |
Pam Clemens |
| 12/12/2007 |
Exposure Tracking Model Ranking |
Site ranked with ETM on 11-30-07 |
Pam Clemens |
| 11/23/2009 |
Update or Other Action |
This update covers groundwater monitoring from 2005 to 2008. Samples collected from monitoring wells at the site did not contain contaminants above Table C cleanup levels except in well MW-9, which contained DRO, GRO, and benzene above the cleanup level in each year it was sampled with fairly stable concentrations. In 2008, DRO was detected at 4.81 mg/l, GRO at 15.4 mg/l and benzene at 4.14 mg/l. |
Bill O'Connell |
| 9/24/2010 |
Document, Report, or Work plan Review - other |
Reviewed 2010 groundwater monitoring report. Groundwater samples were collected from 5 wells, MW-3, -5, -6, -7, and -9. DRO, GRO, and benzene were detected above groundwater cleanup elvels only in MW-9, with DRO detected at 5.44 mg/l, GRO at 14.2 mg/l and benzene at 6.01 mg/l. |
Bill O'Connell |
| 2/23/2011 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 77893 name: gasoline and diesel USTs |
Evonne Reese |
| 8/16/2011 |
Document, Report, or Work plan Review - other |
Reviewed June 2011 groundwater monitoring report for ML&P Transformer Shop. Samples were collected from 5 monitoring wells, MW-3, -5, -6, -7, and -9 and analyzed for DRO, GRO, and BTEX. Contaminants were detected above cleanup levels in MW-9, with DRO detected at 5.25 mg/l, GRO at 11.8 mg/l, and benzene at 4.10 mg/l. Samples from the other wells did not contain contaminants above cleanup levels. Sampling results are consistent with previous data. |
Bill O'Connell |
| 2/11/2013 |
Document, Report, or Work plan Review - other |
Reviewed 2012 Groundwater Monitoring report for ML&P Transformer Shop, 1130 East 1st Ave. Groundwater samples were collected from 5 monitoring wells. DRO, GRO, and benzene were detected above cleanup levels only in well MW-9, which contained DRO at 5.09 mg/l, GRO at 16.2 mg/l and benzene at 5.12 mg/l. Due to slow recharge in well MW-9, the report proposes sampling this well on a no purge basis in 2013. |
Bill O'Connell |
| 11/13/2013 |
Site Characterization Report Approved |
On this date, ADEC reviewed the July 2013 Groundwater monitoring at the ML&P Transformer Shop, 1130 East 1st Ave. Groundwater samples were collected from the 5 monitoring wells MW-3, MW-5, MW-6, MW-7, and MW-9. Due to a low recharge rate in MW-9, GW samples were collected prior to purging then purged dry and allowed to recharge for 24 hours. As a result of a low recovery rate, only one 1-liter sample volume was able to be collected for DRO analysis only after purging. MW-9 was the only MW to contain contaminants above table C cleanup levels with GRO up to 15.9 mg/L, benzene up to 5.62 mg/L and DRO up to 1.75 mg/l before purge and 2.61 mg/L after purge. |
Grant Lidren |
| 7/21/2014 |
Document, Report, or Work plan Review - other |
As part of the 2004 ADEC monitoring request, the groundwater will be sampled in 2014. |
Grant Lidren |
| 1/26/2015 |
Site Characterization Report Approved |
On this date, ADEC reviewed the June 2014 Groundwater monitoring at the ML&P Transformer Shop; 1130 East 1st Ave submitted by SLR, dated January 26, 2015. Groundwater samples were collected from the four monitoring wells MW-5, MW-6, MW-7, and MW-9: MW-3 was damaged and not sampled. Due to a low recharge rate in MW-9, GW samples were collected prior to purging then purged dry and allowed to recharge for 24 hours. MW-9 was the only MW to contain contaminants above Table C cleanup levels with GRO up to 17.1 mg/L, benzene up to 6.160 mg/L and DRO up to 2.63 mg/L. |
Grant Lidren |
| 2/3/2015 |
Site Characterization Workplan Approved |
As part of the 2004 ADEC monitoring request, the groundwater will be sampled in 2015. The four monitoring wells MW-5, MW-6, MW-7, and MW-9 will be sampled. Damaged MW-3 will be decommissioned. |
Grant Lidren |
| 6/9/2015 |
Potentially Responsible Party/State Interest Letter |
PRP letter sent the ML&P on this date. |
Grant Lidren |
| 3/28/2016 |
Site Characterization Report Approved |
On this date, ADEC received the 2015 Groundwater Monitoring at the ML&P Transformer Shop; 1130 E. First Ave .submitted by SLR and dated March 28, 2016. Groundwater samples were collected from the four monitoring wells MW-5, MW-6, MW-7, and MW-9: MW-3 was damaged and decommissioned. Due to a low recharge rate in MW-9, GW samples were collected prior to purging then purged dry and allowed to recharge for 24 hours. MW-9 was the only MW to contain contaminants above Table C cleanup levels with GRO up to 12.5 mg/L, benzene up to 3.62 mg/L and DRO up to 3.22 mg/L. |
Grant Lidren |
| 3/1/2017 |
Site Characterization Report Approved |
On this date, ADEC received the 2016 Groundwater Monitoring at the ML&P Transformer Shop; 1130 E. First Ave .submitted by SLR and dated February 28, 2017. Groundwater samples were collected from the four monitoring wells MW-5, MW-6, MW-7, and MW-9. Due to a low recharge rate in MW-9, GW samples were collected prior to purging then purged dry and allowed to recharge for 24 hours. MW-9 was the only MW to contain contaminants above Table C cleanup levels with GRO up to 2.52 mg/L, DRO up to 2.38 mg/L, benzene up to 0.645 mg/L and xylenes up to 0.2052 mg/L. |
Grant Lidren |
| 4/13/2017 |
Update or Other Action |
ADEC has no objections to ML&Ps request to change the monitoring schedule from annual to biennial. The next biennial monitoring event will occur June 2018. |
Grant Lidren |
| 7/9/2018 |
Site Characterization Report Approved |
On this date, ADEC received and approved the “Work Plan Addendum for Groundwater Monitoring at the ML&P Transformer Shop”. All four monitoring wells MW-5, MW-6, MW-7, and MW-9 will be analyzed for AK methods and BTEX. Additionally, MW-9 will be analyzed for the full suite of VOCs and PAHs. |
Grant Lidren |
| 10/8/2018 |
Site Characterization Report Approved |
On this date, ADEC received the 2018 Groundwater Monitoring at the ML&P Transformer Shop; 1130 E. First Ave submitted by SLR and dated October 8, 2018. Groundwater samples were collected from the four monitoring wells MW-5, MW-6, MW-7, and MW-9. Due to a low recharge rate in MW-9, GW samples were collected prior to purging then purged dry and allowed to recharge for 24 hours. MW-9 was the only MW to contain contaminants above Table C cleanup levels with GRO up to 3.25 mg/L, DRO up to 2.84 mg/L, benzene up to 1.3 mg/L, ethylbenzene up to 0.0668 mg/L, xylenes up to 0.456 mg/L, naphthalene up to 0.068 mg/L, 1,2-dichloroethane up to 0.00965 mg/L, and 1,2,4-trimethylbenzene up to 0.191 mg/L. (note: only MW-9 was sampled for PAHs and the full suite of VOCs). |
Grant Lidren |
| 10/17/2018 |
Site Characterization Workplan Approved |
On this date, ADEC received and approved the Vapor Intrusion Assessment Work Plan ML&P Transformer Shop Building submitted by SLR and dated October 17, 2018. |
Grant Lidren |
| 12/27/2018 |
Site Characterization Report Approved |
On this date, ADEC received the Vapor Intrusion Assessment Report, ML&P Transformer Shop Building submitted by SLR and dated December 27, 2018. Three indoor air samples collected contained xylenes up to 1.5 ug/m3 and toluene up to 2.9 ug/m3. These sample results are well below the November 2017 ADEC residential vapor intrusion target levels for indoor air of 100 ug/m3 and 3800 ug/m3 respectively. |
Grant Lidren |
| 1/10/2019 |
Update or Other Action |
DEC sent a letter indicating that no further evaluation of indoor air vapor intrusion pathway would be required based on the results of the vapor intrusion sampling. DEC requested analysis of AK101, 102, and 103, and the full suite of volatile organic compounds for samples from all wells in the next groundwater monitoring event. This request is based on the last sample results from MW-9, which identified other compounds above DEC cleanup levels that have not been included in the monitoring program. |
Grant Lidren |
| 9/21/2020 |
Site Characterization Report Approved |
On this date, ADEC received the 2020 Groundwater Monitoring at the ML&P Transformer Shop; 1130 E. First Ave submitted by SLR and dated September 21, 2020. Groundwater samples were collected from the four monitoring wells MW-5, MW-6, MW-7, and MW-9. Due to a low recharge rate in MW-9, GW samples were collected prior to purging then purged dry and allowed to recharge for 24 hours. MW-9 was the only MW to contain contaminants above Table C cleanup levels with GRO up to 11.0 mg/L, DRO up to 3.03 mg/L, benzene up to 4.31 mg/L, ethylbenzene up to 0.246 mg/L, xylenes up to 1.01 mg/L, naphthalene up to 0.103 mg/L, 1,2-dichloroethane up to 0.0362mg/L, 1,3,5 trimethylbenzene up to 0.0819 mg/L, and 1,2,4-trimethylbenzene up to 0.344 mg/L. (note: only MW-9 was sampled for PAHs and the full suite of VOCs). The next biennial sampling event is planned for 2022 . Groundwater will be analyzed for Alaska methods and VOCs by 8260 in all the monitoring wells |
Grant Lidren |
| 12/21/2022 |
Site Characterization Report Approved |
ADEC approved the 2022 GW Monitoring Report. |
Arika Garcia |
| 1/5/2023 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77893 gasoline and diesel USTs. |
Arika Garcia |
| 10/29/2024 |
Document, Report, or Work plan Review - other |
DEC approved the 2024 Groundwater Monitoring Report detailing the sampling of four monitoring wells at the Transformer Shop. |
Livia Bracker |
