Site Report: Municipal Light & Power Maintenance Facility

Site Name:	Municipal Light & Power Maintenance Facility
Address:	1121 East 1st Avenue;, Anchorage, AK 99501
File Number:	2100.26.301
Hazard ID:	23606
Status:	Cleanup Complete
Staff:	No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude:	61.221978
Longitude:	-149.860463
Horizontal Datum:	NAD83

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

Groundwater and soil treatment addressing the gasoline contamination has been underway since 2/19/90. ADEC requesting assessment of soils left in place when the waste oil "pit" was excavated. Excavated soils from this pit contained trichloroethane and tetrachloroethylene. Groundwater is at about 6 feet and flows towards the west to southwest. No private wells were identified 1/4 mile downgradient of the site. 3 private wells identified upgradient. A perforated storm sewer south of the property is believed to receive groundwater discharge from the shallow aquifer affected by the site contamination. This storm sewer discharges to Ship Creek. EPA ID# AKD039269618 Hazardous Waste Activity: generator 2. FKA L69.05

Action Information

Action Date	Action	Description	DEC Staff
3/27/1989	Underground Storage Tank Site Characterization or Assessment	SA1R;	Former Staff
3/27/1989	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST Site created in CSP for source area ID 77887 ADD; Gasoline contaminant.	Former Staff
3/27/1989	Site Added to Database		Former Staff
3/28/1989	Leaking Underground Storage Tank Cleanup Initiated - Petroleum	LCAU; :LCAU Date changed DB conversion	Former Staff
3/31/1989	Update or Other Action	REM; ML&P removes a suspected leaking underground storage tank and contaminated soils. A spill report was filed by ADEC personnel on 3/29/89. Work was initiated when the UST failed a tank tightness test on 3/29/90. 30 day tank notification waived due to urgency of situation. Approx. 400 cubic yards of contaminated soils removed. The excavation was backfilled on 4/7/89. An abandoned, gravel bottomed, oil/water separator discovered while excavation. Excavated soils from this area stockpiled separately.	Former Staff
4/6/1989	Release Investigation	SI; A report by Stone & Webster - Interim Report covering site activity to 3/28/89. Borings were placed to determine contamination plume and to characterize the hydrologic conditions. Groundwater is about 6 feet below the surface and flows towards the west-southwest. The plume of dissolved product covers a larger area than the free product plume. Product recovery well installed.	Former Staff
4/6/1989	Leaking Underground Storage Tank Corrective Action Underway	RAPR; RZA Consultants submit work plan for determining the vertical and horizontal extent of petroleum hydrocarbon contamination.	Former Staff
4/17/1989	Update or Other Action	REM; The gasoline contaminated soil was transported to and processed by AS&G. AS&G processed 570 tons.	Former Staff
4/28/1989	Release Investigation	SI; Stone & Webster Interim report covering site activity from 4/28 to 5/25/89.	Former Staff
5/11/1989	Release Investigation	SI; A water well search was conducted within 1/4 mile radius. 3 wells were located upgradient of the site.	Former Staff
5/16/1989	Update or Other Action	REM; Approx. 140 gallons of groundwater had been pumped from the site. Prior to 5/12 Alaska Pollution Control received this wastewater for treatment. After 5/12 the Municipality collected the wastewater for temporary storage in a 360 K gallon tank at ML&P's George M. Sullivan generation plant at 8760 Glenn Highway. Prior to 5/9 approx. 265 gallons of product were recovered from pumping operations. On 5/10 and 5/11 only trace amounts of product were recovered.	Former Staff
6/29/1989	Update or Other Action	PER; ADEC grants ML&P a permit variance to inject wastewater/groundwater pumped from the site into the exhaust of turbine #8. Approval expires 12/30/89.	Former Staff
9/20/1989	Update or Other Action	F; ADEC will allow ML&P to temporarily halt pumping of recovery well. ML&P storage facilities are exhausted since the turbine used for injection is under renovation. ML&P is researching alternative groundwater treatment.	Former Staff
10/10/1989	Update or Other Action	F; RZA Consultants begin construction on 10/10/89 for on-site treatment of recovered groundwater and vapor extraction for soils treatment.	Former Staff
11/2/1989	Leaking Underground Storage Tank Corrective Action Underway	RAPR; RZA Consultants work plan for soil and groundwater remediation.	Former Staff
12/1/1989	Update or Other Action	F; RZA Consultants begin installation of vapor extraction and air stripping equipment. After installation, the systems began performance tests. The vapor extraction system went into full operation on 1/11/90. As of 2/19/90 the groundwater treatment system, operating 24 hours/day has treated 498,100 gallons. Treatment efficiency estimated at 98.8% for removal of contaminants from groundwater.	Former Staff
3/15/1990	Update or Other Action	PER; ML&P received a waste disposal permit No. 8921-DB003 for treated groundwater. Water discharged into an on-site infiltration gallery.	Former Staff
11/1/1990	Leaking Underground Storage Tank Corrective Action Underway	RAPR; ML&P requests to process waste soils from waste oil/water separator at AS&G. Denied because of tetrachloroethylene and trichloroethane in soils analyses. ADEC wants to assess soils left in place at waste oil excavation.	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.	Former Staff
11/22/1995	Release Investigation	RELR; Reviewed a release investigation 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	Address change for site location from 1021 to 1121.; Jim Pfeiffer; 263-5273	Former Staff
11/1/1998	Update or Other Action	Document / File Review	Daniel Rogers
2/1/2000	Update or Other Action	Meeting with RP; Proposed GW Monitoring Reduction and New GW MW	Daniel Rogers
8/14/2002	Update or Other Action	Entry deleted "Site cleanup completed"	Amanda Dreyer
1/30/2004	Update or Other Action	ADEC sent a letter to Lena Savile of M L& P approving the December 2003, Groundwater Monitoring report for the maintenance facility located at 1121 E. 1st Avenue, in Anchorage. Results show elevated levels of trichloroethene (TCE) and tetrachloroethene (PCE) with maximum concentrations of 0.0118mg/l TCE and 0.0359 mg/l PCE. These levels exceed the applicable clean up levels of 0.005mg/l TCE and 0.005 mg/l PCE. Continued quarterly groundwater monitoring was requested. ADEC suggested the submission of one report regarding the next two sampling events however ADEC must be notified within 72 hours of any irregular results.	Beatrice Egbejimba
6/22/2004	Update or Other Action	ADEC received report entiitled May 2004 Groundwater Monitoring at 1121 E. 1st Ave.	Beatrice Egbejimba
8/24/2004	Update or Other Action	On 8/24/04, Sundet met with Lena Savile of ML&P to discuss ML&P contaminated sites including the May 04 groundwater report for the site at 1121 E. 1st Ave. Based upon the discussion that no recommendation or requests were made in the report and that further groundwater monitoring will occur, no written response was deemed necessary. The report showed that at MW B2 TCE (at 0.0150 ppm) and PCE (at 0.0346 ppm) were above Table C cleanup levels.	Rich Sundet
9/8/2006	Update or Other Action	File number issued 2100.26.301 (FKA L69.05).	Aggie Blandford
10/12/2007	Update or Other Action	May 2007 groundwater monitoring report received and QA/QC conducted. One groundwater sample was collected from MW B2. TCE was detected at 0.0147 mg/l (est) and PCE was detected at 0.0491 mg/l (est). These concentrations are above the Table C cleanup Level of 0.005 mg/l for each analyte and are within the same order of magnitude as previous samples.	Bill O'Connell
11/14/2007	Update or Other Action	Initial ETM ranking	Bill O'Connell
11/14/2007	Exposure Tracking Model Ranking	Intitial Ranking Complete for Source Area: 77887 (Autogenerated Action)
11/23/2007	Document, Report, or Work plan Review - other	October 2007 Groundwater Monitoring Report received and QA/QC conducted. One groundwater sample was collected from monitoring well B2 TCE was detected at 0.0192 mg/l and PCE was detected at 0.0453. both above the clenaup level of 0.005 mg/l.	Bill O'Connell
9/30/2008	Site Characterization Report Approved	Received July 2008 groundwater monitoring report for 1121 East 1st Ave. One sample was collected from monitoring well B-2, located in the former source area and analyzed for VOCs by 8260. TCE was detected at 0.0206 mg/l and PCE was detected at 0.0438 mg/l, above the Table C cleanup level of 0.005 mg/l for each. These concentrations are consistent with previous data. In a separate investigation, the EPA installed well points west of the former waste oil tank to evaluate the former tanks contribution to vinyl chloride contamination found downgradient during the ARRC RI. The results of the investigation indicate the solvent contamination from the waste oil tank degrades rather quickly and the contaminant plume is generally attenuated a short distance from the source area and is not responsible for the vinyl chloride plume.	Bill O'Connell
11/10/2008	Document, Report, or Work plan Review - other	Received September 2008 Monitoring Report for 1121 East 1st Ave. TCE was detected at 0.0142 mg/l and PCE was detected at 0.0250 mg/l in monitoring well B-2.	Bill O'Connell
9/10/2009	Document, Report, or Work plan Review - other	Reviewed July 2009 Groundwater Monitoring Report for 1121 E. First Ave. One sample and a duplicate were collected from well B2. TCE was detected up to 0.0159 mg/l and PCE was detected up to 0.0359 mg/l.	Bill O'Connell
8/6/2010	Document, Report, or Work plan Review - other	Reviewed June 2010 Groundwater monitoring report for 1121 E. 1st Ave. One sample collected from well B2 contained PCE at 0.0311 mg/l and TCE at 0.0132 mg/l.	Bill O'Connell
8/12/2010	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77887 Former Waste Oil Tank.	Bill O'Connell
8/20/2010	Cleanup Complete Determination Issued	The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) has completed a review of the environmental records associated with the Municipal Light & Power Maintenance Facility located at 1121 East First Avenue in Anchorage, Alaska. Based on the information provided to date, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment and this site will be closed.	Bill O'Connell
9/24/2010	Document, Report, or Work plan Review - other	Reviewed August 2010 Groundwater Monitoring Report for 1121 East 1st Ave. TCE was detected at 0.0146 mg/l and PCE was detected at 0.0316 mg/l.	Bill O'Connell

Action Date

Action

Description

DEC Staff

3/27/1989

Underground Storage Tank Site Characterization or Assessment

SA1R;

Former Staff

3/27/1989

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 77887 ADD; Gasoline contaminant.

Former Staff

3/27/1989

Site Added to Database

Former Staff

3/28/1989

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

LCAU; :LCAU Date changed DB conversion

Former Staff

3/31/1989

Update or Other Action

REM; ML&P removes a suspected leaking underground storage tank and contaminated soils. A spill report was filed by ADEC personnel on 3/29/89. Work was initiated when the UST failed a tank tightness test on 3/29/90. 30 day tank notification waived due to urgency of situation. Approx. 400 cubic yards of contaminated soils removed. The excavation was backfilled on 4/7/89. An abandoned, gravel bottomed, oil/water separator discovered while excavation. Excavated soils from this area stockpiled separately.

Former Staff

4/6/1989

Release Investigation

SI; A report by Stone & Webster - Interim Report covering site activity to 3/28/89. Borings were placed to determine contamination plume and to characterize the hydrologic conditions. Groundwater is about 6 feet below the surface and flows towards the west-southwest. The plume of dissolved product covers a larger area than the free product plume. Product recovery well installed.

Former Staff

4/6/1989

Leaking Underground Storage Tank Corrective Action Underway

RAPR; RZA Consultants submit work plan for determining the vertical and horizontal extent of petroleum hydrocarbon contamination.

Former Staff

4/17/1989

Update or Other Action

REM; The gasoline contaminated soil was transported to and processed by AS&G. AS&G processed 570 tons.

Former Staff

4/28/1989

Release Investigation

SI; Stone & Webster Interim report covering site activity from 4/28 to 5/25/89.

Former Staff

5/11/1989

Release Investigation

SI; A water well search was conducted within 1/4 mile radius. 3 wells were located upgradient of the site.

Former Staff

5/16/1989

Update or Other Action

REM; Approx. 140 gallons of groundwater had been pumped from the site. Prior to 5/12 Alaska Pollution Control received this wastewater for treatment. After 5/12 the Municipality collected the wastewater for temporary storage in a 360 K gallon tank at ML&P's George M. Sullivan generation plant at 8760 Glenn Highway. Prior to 5/9 approx. 265 gallons of product were recovered from pumping operations. On 5/10 and 5/11 only trace amounts of product were recovered.

Former Staff

6/29/1989

Update or Other Action

PER; ADEC grants ML&P a permit variance to inject wastewater/groundwater pumped from the site into the exhaust of turbine #8. Approval expires 12/30/89.

Former Staff

9/20/1989

Update or Other Action

F; ADEC will allow ML&P to temporarily halt pumping of recovery well. ML&P storage facilities are exhausted since the turbine used for injection is under renovation. ML&P is researching alternative groundwater treatment.

Former Staff

10/10/1989

Update or Other Action

F; RZA Consultants begin construction on 10/10/89 for on-site treatment of recovered groundwater and vapor extraction for soils treatment.

Former Staff

11/2/1989

Leaking Underground Storage Tank Corrective Action Underway

RAPR; RZA Consultants work plan for soil and groundwater remediation.

Former Staff

12/1/1989

Update or Other Action

F; RZA Consultants begin installation of vapor extraction and air stripping equipment. After installation, the systems began performance tests. The vapor extraction system went into full operation on 1/11/90. As of 2/19/90 the groundwater treatment system, operating 24 hours/day has treated 498,100 gallons. Treatment efficiency estimated at 98.8% for removal of contaminants from groundwater.

Former Staff

3/15/1990

Update or Other Action

PER; ML&P received a waste disposal permit No. 8921-DB003 for treated groundwater. Water discharged into an on-site infiltration gallery.

Former Staff

11/1/1990

Leaking Underground Storage Tank Corrective Action Underway

RAPR; ML&P requests to process waste soils from waste oil/water separator at AS&G. Denied because of tetrachloroethylene and trichloroethane in soils analyses. ADEC wants to assess soils left in place at waste oil excavation.

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.

Former Staff

11/22/1995

Release Investigation

RELR; Reviewed a release investigation 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

Address change for site location from 1021 to 1121.; Jim Pfeiffer; 263-5273

Former Staff

11/1/1998

Update or Other Action

Document / File Review

Daniel Rogers

2/1/2000

Update or Other Action

Meeting with RP; Proposed GW Monitoring Reduction and New GW MW

Daniel Rogers

8/14/2002

Update or Other Action

Entry deleted "Site cleanup completed"

Amanda Dreyer

1/30/2004

Update or Other Action

ADEC sent a letter to Lena Savile of M L& P approving the December 2003, Groundwater Monitoring report for the maintenance facility located at 1121 E. 1st Avenue, in Anchorage. Results show elevated levels of trichloroethene (TCE) and tetrachloroethene (PCE) with maximum concentrations of 0.0118mg/l TCE and 0.0359 mg/l PCE. These levels exceed the applicable clean up levels of 0.005mg/l TCE and 0.005 mg/l PCE. Continued quarterly groundwater monitoring was requested. ADEC suggested the submission of one report regarding the next two sampling events however ADEC must be notified within 72 hours of any irregular results.

Beatrice Egbejimba

6/22/2004

Update or Other Action

ADEC received report entiitled May 2004 Groundwater Monitoring at 1121 E. 1st Ave.

Beatrice Egbejimba

8/24/2004

Update or Other Action

On 8/24/04, Sundet met with Lena Savile of ML&P to discuss ML&P contaminated sites including the May 04 groundwater report for the site at 1121 E. 1st Ave. Based upon the discussion that no recommendation or requests were made in the report and that further groundwater monitoring will occur, no written response was deemed necessary. The report showed that at MW B2 TCE (at 0.0150 ppm) and PCE (at 0.0346 ppm) were above Table C cleanup levels.

Rich Sundet

9/8/2006

Update or Other Action

File number issued 2100.26.301 (FKA L69.05).

Aggie Blandford

10/12/2007

Update or Other Action

May 2007 groundwater monitoring report received and QA/QC conducted. One groundwater sample was collected from MW B2. TCE was detected at 0.0147 mg/l (est) and PCE was detected at 0.0491 mg/l (est). These concentrations are above the Table C cleanup Level of 0.005 mg/l for each analyte and are within the same order of magnitude as previous samples.

Bill O'Connell

11/14/2007

Update or Other Action

Initial ETM ranking

Bill O'Connell

11/14/2007

Exposure Tracking Model Ranking

Intitial Ranking Complete for Source Area: 77887 (Autogenerated Action)

11/23/2007

Document, Report, or Work plan Review - other

October 2007 Groundwater Monitoring Report received and QA/QC conducted. One groundwater sample was collected from monitoring well B2 TCE was detected at 0.0192 mg/l and PCE was detected at 0.0453. both above the clenaup level of 0.005 mg/l.

Bill O'Connell

9/30/2008

Site Characterization Report Approved

Received July 2008 groundwater monitoring report for 1121 East 1st Ave. One sample was collected from monitoring well B-2, located in the former source area and analyzed for VOCs by 8260. TCE was detected at 0.0206 mg/l and PCE was detected at 0.0438 mg/l, above the Table C cleanup level of 0.005 mg/l for each. These concentrations are consistent with previous data. In a separate investigation, the EPA installed well points west of the former waste oil tank to evaluate the former tanks contribution to vinyl chloride contamination found downgradient during the ARRC RI. The results of the investigation indicate the solvent contamination from the waste oil tank degrades rather quickly and the contaminant plume is generally attenuated a short distance from the source area and is not responsible for the vinyl chloride plume.

Bill O'Connell

11/10/2008

Document, Report, or Work plan Review - other

Received September 2008 Monitoring Report for 1121 East 1st Ave. TCE was detected at 0.0142 mg/l and PCE was detected at 0.0250 mg/l in monitoring well B-2.

Bill O'Connell

9/10/2009

Document, Report, or Work plan Review - other

Reviewed July 2009 Groundwater Monitoring Report for 1121 E. First Ave. One sample and a duplicate were collected from well B2. TCE was detected up to 0.0159 mg/l and PCE was detected up to 0.0359 mg/l.

Bill O'Connell

8/6/2010

Document, Report, or Work plan Review - other

Reviewed June 2010 Groundwater monitoring report for 1121 E. 1st Ave. One sample collected from well B2 contained PCE at 0.0311 mg/l and TCE at 0.0132 mg/l.

Bill O'Connell

8/12/2010

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77887 Former Waste Oil Tank.

Bill O'Connell

8/20/2010

Cleanup Complete Determination Issued

The Alaska Department of Environmental Conservation, Contaminated Sites Program (ADEC) has completed a review of the environmental records associated with the Municipal Light & Power Maintenance Facility located at 1121 East First Avenue in Anchorage, Alaska. Based on the information provided to date, it has been determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment and this site will be closed.

Bill O'Connell

9/24/2010

Document, Report, or Work plan Review - other

Reviewed August 2010 Groundwater Monitoring Report for 1121 East 1st Ave. TCE was detected at 0.0146 mg/l and PCE was detected at 0.0316 mg/l.

Bill O'Connell

Contaminant Information

Name	Level Description	Media
Benzene	Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation	Soil
Tetrachloroethene	Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation	Soil
Trichloroethene	Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation	Soil

Name

Level Description

Media

Comments

Benzene

Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation

Soil

Tetrachloroethene

Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation

Soil

Trichloroethene

Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation

Soil

Control Type

Type	Details
No ICs Required

Type

Details

No ICs Required

Requirements

Description	Details
Advance approval required to transport soil or groundwater off-site.

Description

Details

Advance approval required to transport soil or groundwater off-site.

Record of Decision

Hazard ID	Site Name	File Number
25453	Municipal Light & Power Operations 1201 East 1st Avenue	2100.38.513

Hazard ID

Site Name

File Number

25453

Municipal Light & Power Operations 1201 East 1st Avenue

2100.38.513

Missing Location Data

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Site Report: Municipal Light & Power Maintenance Facility

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

Record of Decision

Missing Location Data

State of Alaska Department of Environmental Conservation