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Site Report: Bank Building, Former


Site Name: Bank Building, Former
Address: 441 West 5th Avenue, Anchorage, AK 99501
File Number: 2100.38.102
Hazard ID: 3733
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 61.217806
Longitude: -149.889056
Horizontal Datum:

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.

Problems/Comments

Leakage documented from a 2,000 gallon heating oil tank which has been closed in place due to the proximity of utilities. Closure entailed filling the tank with a sand slurry (=sand + water pumped in). Lot 7, Block 43, Original Townsite Subdivision.

Action Information

Action Date Action Description DEC Staff
1/30/2001 Update or Other Action Received "Work Plan for Underground Storage Tank Release Investigation" dated January 30, 2001 and "Underground Storage Tank Closure Assessment" report dated January 2001 that documents in-place tank closure done on January 18 and 19, 2001 that included sampling through the bottom of the tank in two locations and filling the tank with a sand slurry. ADEC was not notified prior to assessment work. Eileen Olson
2/1/2001 Site Characterization Workplan Approved Approved plan to install a boring, to be completed as a monitoring well, adjacent to the tank. Eileen Olson
2/8/2001 Site Added to Database Heating oil. No Longer Assigned
2/14/2001 Update or Other Action Received cover letter dated 2/14/2001 requesting NFRAP status with report dated 2/13/2001 titled "Underground Storage Tank Release Investigation, 441 W. 5th Avenue". The report documents groundwater present at 15 feet below the ground surface with DRO levels below the cleanup level, with DRO levels of 2, 700 mg/Kg at the soil-groundwater interface, and includes an estimate that 4 cubic yards of soil remain at the site with DRO levels above the cleanup level of 250 mg/Kg. Eileen Olson
2/15/2001 Update or Other Action ADEC issued letter "Requirements for No Further Remedial Action Planned and Institutional Contraol Status" and "review of "Underground Storage Tank Release Investigation". The letter requested a well search for a 300-foot radius from the tank, and requiring monitoring of the well adjacent to the tank for a minimum of four quarterly monitoring events. Eileen Olson
3/8/2001 Update or Other Action Rec'd "Water Well Survey, 441 W. 5th Avenue" dated 3/7/2001 that documents a drinking water well search for a 300 foot radius from the site, as requested by ADEC. The reduced radius of the drinking water well search was allowed based on the low apparent risk of groundwater contamination, i.e. the groundwater at 15 feet bgs was not impacted above default DRO cleanup levels. Also received letter from consultant dated March 5, 2001 requesting NFRAP/IC status. Eileen Olson
3/15/2001 Update or Other Action Institutional control established (See 2-5-2007 for new requirement for institutional controls). Long-term groundwater monitoring for a minimum of four quarters established pursuant to NFRAP letter of same date. Recording of NEC as deed notice also required. Eileen Olson
3/15/2001 Conditional Closure Approved No Further Remedial Action Planned status granted contingent upon continued monitoring with stable or declining DRO levels in groundwater. Groundwater was not impacted above 18 AAC 75.345 Table C levels for DRO, but an estimated 4 cubic yards of impacted soil with DRO levels in excess of cleanup standards remains at the site. Eileen Olson
1/18/2007 Update or Other Action ADEC received "Groundwater Monitoring Well Installation & Sampling" report dated January 17, 2007. Report documented installation of new well on January 11, 2007 that was sampled on January 12, 2007, and analytical result of 1.88 mg/L DRO. The report also included information first reported to the Department Jan. 5, 2007. That is, the on-site well was deepened to 27 ft in May 2001 and groundwater sampling results showed DRO concentrations above site cleanup levels at 3.3 mg/L. Eileen Olson
1/30/2007 Update or Other Action ADEC received previously unsubmitted documents including a December 2001 draft report, a July 2001 draft report and analytical report tables dated January 2001. Eileen Olson
2/5/2007 Conditional Closure Approved Institutional control established including groundwater monitoring and filing NEC (recorded copy must be provided to ADEC). Excerpt from Record of Decision of same date: "7. The attached Notice of Environmental Contamination (NEC) including Figure A must be recorded at the State Recorder's Office on the property deed for Lot 7, Block 43, Original Townsite of Anchorage in accordance with ADEC regulations 18 AAC 75.375 requiring institutional site controls. A copy of the recorded notice must be provided to ADEC by April 15, 2007. The institutional control on the site shall remain in effect until such time that the owner demonstrates that any contamination remaining meets the cleanup levels established in 18 AAC 75.341 Method 2, the migration to groundwater pathway in soil and 18 AAC 75.345 Table C groundwater cleanup levels. In addition, a statement will be included in the ADEC database for this site as a form of an institutional control describing the location, concentration and extent of remaining soil and groundwater contamination that exceeds site cleanup levels. (This requirement replaces Condition #4 of the 2001 conditional closure letter)." Eileen Olson
2/5/2007 Record of Decision Issued Record of Decision (ROD) that sets forth the requirements for Conditional Site Closure status to include monitoring of groundwater found to be present at 23 feet rather than 15 feet as previously believed at time Conditional Site Closure was issued in 2001. ROD requires that Notice of Environmental Contamination be filed on deed. Extract from letter: Requirements for continued Conditional Site Closure status: Based on the file review and additional information provided to ADEC in recent weeks, this letter modifies the existing conditional site closure as follows: 1. A groundwater monitoring plan must be implemented that is approved by ADEC. The plan will be submitted to ADEC by March 30,2007. The plan will specify that MW2 installed on January 11,2007 be monitored until a stable or declining trend in contaminants is established as determined by the Department. (This requirement replaces Condition #2 of ADEC's 2001 conditional closure letter). 2. Samples from the next monitoring event, i.e., next event after this decision document is issued, must be analyzed for diesel range organics (DRO), gasoline range organics (GRO) and volatiles (BTEX). The record shows that the groundwater has not been analyzed for these compounds, and the soil has not been characterized between a depth of approximately 10 feet bgs and the groundwater table at approximately 23 feet bgs. If GRO and BTEX are not detected additional sampling for these compounds will not be required. 3. Results of the monitoring must be reported within 60 days of sampling. 4. Monitoring well decommissioning must be done in accordance with ADEC guidance adopted by reference in 18 AAC 75.345 (j), Groundwater and surface water cleanup levels.' If an alternative method other than the methods described in the monitoring well guidance "Recommended Practices for Monitoring Well Design, Installation, and Decommissioning" is proposed, a work plan must be submitted for Department approval before work is done. In addition, ADEC requires that a brief report of monitoring well decommissioning be submitted within 30 days of decommissioning the wells at the site. 5. The consultant has revised the estimated volume of impacted soil at the site and the extent of soil and groundwater contamination is as shown on Figure A of the attached Notice of Environmental Contamination. The consultant has estimated the volume of contaminated soil with DRO concentrations greater than the site cleanup level of 250 mg/Kg as "less than 125 cubic yards, with a more probable volume in the range of 50-75 cubic yards." 6. The conditional closure is modified to include the additional information summarized in the background section below. 7. (SEE "Institutional Control Entry of same date 2-5-2007) Eileen Olson
2/5/2007 Institutional Control Record Established Proposed Notice of Environmental Contamination (NEC) to be filed as a deed notice was attached to the Record of Decision (ROD) issued on 2/5/2007 and is required to be filed by . Additionally, the ROD outlines requirements for groundwater monitoring and reporting. Eileen Olson
2/7/2007 Exposure Tracking Model Ranking Eileen Olson
2/12/2007 Update or Other Action Notice of Environmental Contamination in file recorded on 2/12/2007 as 2007-008801-0 in Recording District 301-Anchorage. NEC was signed by RP on 2/8/2007. Eileen Olson
2/22/2007 Update or Other Action Approved Groundwater monitoring plan. The plan, received February 6, 2007, conforms to the requirements of the Record of Decision. Eileen Olson
7/9/2007 Update or Other Action Received on July 9: results for April 2007 monitoring of on-site well. DRO at 3.71 mg/L in groundwater exceeds cleanup level. Previous result for Jan. 12, 2007 sampling was 1.88 mg/L. Eileen Olson
2/14/2008 Long Term Monitoring Complete Approval granted to terminate groundwater monitoring and decommission monitoring wells based on ADEC concurrence with findings of letter report dated January 15, 2008. Findings were that required groundwater monitoring of MW2 showed stable or declining trend in groundwater contaminant levels, with DRO the contaminant of concern. Eileen Olson
8/18/2008 Update or Other Action Received report dated Aug 18 2008 that the two monitoring wells at the site (Well B1MW and MW2) were decommissioned on June 9, 2008 in accordance with accepted well abandonment and decommissioning practices. Eileen Olson
9/14/2012 Update or Other Action Staff changed from Eileen Olson to IC Unit. Kristin Brown
9/26/2012 Institutional Control Compliance Review IC review conducted. Removed the groundwater monitoring requirement from the IC details that dates back to 2008. Evonne Reese
1/8/2016 Institutional Control Compliance Review IC compliance review conducted and an IC reminder letter issued to the responsible party on this date. Reminder system set to follow-up in 2021. Kristin Brown

Contaminant Information

Name Level Description Media Comments
DRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
DRO > Table C Groundwater

Control Type

Type Details
Notice of Environmental Contamination (Deed Notice) Deed notice recorded: identifies location of contamination and requires ADEC approval before soil is transported offsite or dewatering occurs.

Requirements

Description Details
Excavation / Soil Movement Restrictions
When Contaminated Soil is Accessible, Remediation Should Occur

Missing Location Data

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