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Site Report: Z. J. Loussac Public Library

Site Name: Z. J. Loussac Public Library
Address: 3600 Denali Street, Site Actually on Sharrock Way, Anchorage, AK 99503
File Number: 2100.38.468
Hazard ID: 4241
Status: Cleanup Complete
Staff: No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude: 61.187222
Longitude: -149.877500
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.

Problems/Comments

Municipality of Anchorage representatives encountered petroleum impacted soil during onsite utility upgrades. Groundwater was observed at approximately 8' below ground surface (bgs) in an excavation and appeared to have a hydrocarbon sheen. Based on conversation with on-site personnel, the impacted soil was first encountered at approximately 6' bgs. Initial soil samples resulted in 1,920 mg/Kg DRO, exceeding the ADEC Cleanup Level of 250 mg/Kg. The same sample contained 7.85 mg/Kg GRO and 0.0349 mg/Kg xylenes, both below cleanup levels. No benzene, toluene, or ethylbenzene was detected. Approximately 10-15 cubic yards of potentially impacted soil was excavated. Approximately 20-25 cubic yards of potentially clean material was excavated. Both stockpiles were backfilled into the excavation after initial excavation. A total of 140 cubic yards was taken to the Anchorage Municipal Landfill for disposal.

Action Information

Action Date Action Description DEC Staff
5/4/2006 Site Added to Database DRO contamination above cleanup levels. Bill Petrik
5/4/2006 Site Ranked Using the AHRM Initial ranking. Bill Petrik
5/4/2006 GIS Position Updated Latitude and longitude data gathered from TopoZone Pro Hi-Res Aerial Photo, Large Size Map, 1:3,333 Scale, No Topo Base Map, NAD 83 in conjunction with Anchorage Area Atlas and Figure 1, Site Map from Shannon & Wilson, Inc. report "Release Investigation Work Plan, Z. J. Loussac Public Library, 3600 Denali Street, Anchorage, Alaska" dated 4/26/06. High degree of confidence in accuracy of coordinates. Bill Petrik
5/5/2006 Update or Other Action File number issued: 2100.38.468. Aggie Blandford
5/5/2006 Site Characterization Workplan Approved Reviewed the Shannon & Wilson, Inc, report "Release Investigation Work Plan, Z. J. Loussac Public Library, 3600 Denali Street, Anchorage, Alaska" dated April 26, 2006. Spoke with Dan McMahon regarding two issues that need to be addressed and then approved work plan. Letter sent out. Bill Petrik
6/26/2006 Update or Other Action Received the Shannon & Wilson, Inc. report "Release Investigation, 3600 Denali Street, Anchorage, Alaska" dated June 2006. Bill Petrik
7/25/2006 Preliminary Assessment Approved Sent a letter to the Municipality of Anchorage regarding the Z. J. Loussac Public Library after Review of the Shannon & Wilson, Inc. report Release Investigation, 3600 Denali Street, Anchorage, Alaska dated June 2006. During utility upgrade work, diesel range organics (DRO) contamination was discovered above cleanup levels and the excavation was backfilled with both clean and contaminated soils that were excavated after work was completed. During the release investigation, four investigative boreholes were drilled, soil sampled during drilling, and monitoring wells installed in each after penetrating the unconfined aquifer. Soil and ground water sampling was performed for gasoline range organics (GRO), DRO, benzene, toluene, ethylbenzene, and xylenes (BTEX). None of the soil and groundwater sampling results were above ADEC Cleanup Levels. The department requested submittal of a corrective action plan to address the contaminated soil discovered during utility work in April 2006 remaining in the ground. Bill Petrik
8/24/2006 Update or Other Action Received an electronic version of the Shannon & Wilson, Inc. "Construction Environmental Management Plan, Z.J. Loussac Public Library, 3600 Denali Street, Anchorage, Alaska". Bill Petrik
9/12/2006 Site Characterization Workplan Approved The Contaminated Site Program reviewed and conditionally approved a Construction Environmental Management Plan for the Z. J. Loussac Public Library in Anchorage. The purpose of the plan is to manage impacted soil and groundwater during future utility work. The project is to consist of monitoring the soil excavation, agency coordination, disposing of impacted soil and groundwater, collecting soil samples, and presenting a summary report. Conditions include: soil and ground water analysis for DRO, GRO, RRO, and 8260 because of an unknown source; and sampling of tanked IDW water resulting from dewatering before determining disposal fate. Bill Petrik
9/18/2006 Update or Other Action Talked with Dan McMahon of Shannon & Wilson, Inc. via telephone. He reiterated that the MOA was interested in only doing enough excavation and sampling work to perform the necessary utility work to get the job done and no more. The contaminated soil would be stockpiled and trucked to ASR for treatment and the excavation backfilled with clean material. He claimed that there is no risk from the existing contamination and therefore no extra characterization and removal work was necessary. I reiterated that the department's position was requesting further characterization and removal and that the site would remain open on the CSP DB. Bill Petrik
10/19/2006 Update or Other Action Responded to S&W's Haydar Turkar's voice mail. Called him back and talked to him regarding sampling water pumped out of truck into storage tanker truck. Sheen was observed on water in excavation after pumping a while. We decided to sample both the water in tank and in the excavation with no duplicate because the site budget only included two water samples. Bill Petrik
10/24/2006 Cleanup Plan Approved Approved a request to transport 140 cubic yards of DRO-impacted soil to the MOA Regional Landfill for disposal in accordance with the Shannon & Wilson, Inc. 8/22/06 ADEC-approved work plan. Four samples were taken of these soils and the results ranged from 331 mg/kg to 814 mg/kg which is under the 1,000 mg/kg MOA limit. Bill Petrik
1/18/2008 Update or Other Action The CSP received a copy of a cc'd letter to Devra Hayes from Pam Post, Department of Law (DOL), dated 1/16/08 indicating that the DOL received a cost recovery check from the RP. The latest Bill for Collection to the RP was related to the cost recovery period of 5/1/06 to 1/31/07. Bill Petrik
5/1/2008 Update or Other Action Read and processed a copy of a cc'd letters to Devra Hayes from Pam Post, Department of Law (DOL), dated 4/30/08 the CSP received on 5/1/08 indicating that the DOL received a cost recovery check from the RP covering the entire amount of the Bill for Collection SPAR08483. This payment from the RP was related to the cost recovery period of 9/1/07 through 1/31/08. Bill Petrik
5/16/2008 Exposure Tracking Model Ranking Initial ranking with ETM completed. Bill Petrik
5/7/2009 Site Characterization Report Approved Reviewed a copy of the Shannon & Wilson, Inc. "Excavation Monitoring and Cleanup Activities, Z.J.Loussac Public Library, 3600 Denali Street, Anchorage, Alaska" dated 4/25/08, received 5/01/08, on 5/16/08. One excavation sidewall sample at 6' bgs was above the cleanup level for DRO at 373 mg/kg. MW-2 was decommissioned. GW is clean. A contaminated stockpile was disposed of in an approved manner. Sent a letter this date indicating that the site is ready for closure, with a site note as to the residual contamination, pending a determination by the MOA whether they wish to decommission the remaining three monitoring wells on site and submittal of an updated CSM. Bill Petrik
5/7/2009 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 75206 Utility Corridor. Bill Petrik
6/8/2011 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 Z. J. Loussac Public Library located at 3600 Denali Street, 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
7/5/2011 Document, Report, or Work plan Review - other Approved work plan to decommission three remaining monitoring wells at the site Bill O'Connell
8/15/2011 Document, Report, or Work plan Review - other Reviewed report detailing the decommissioning of the three remaining monitoring wells at the site. Bill O'Connell

Contaminant Information

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

Control Type

Type Details
No ICs Required

Requirements

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

No associated sites were found.

Missing Location Data

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
Fax: 907-465-5245
TDD: 800-770-8973
Physical Location: 410 Willoughby