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Site Report: Delta Western Yakutat

Site Name: Delta Western Yakutat
Address: Alsek & Ocean Cape Road Intersection, Monti Bay, Yakutat, AK 99689
File Number: 1530.38.005
Hazard ID: 1979
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 59.544716
Longitude: -139.733218
Horizontal Datum:WGS84

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

Substantial diesel (DRO) and gas range (GRO) hydrocarbon soil contamination is associated with the tank farm, former truck rack, and valve house. Soil was removed from the floor of the tank farm to a depth of 15 feet without reaching clean soil. The Tank Farm is located on Tract 2-D ASLS 90-213. Additional pipelines, a truck loading rack and dockside marine head for the facility are located on right of ways on Tract 2-A ASLS 90-213 and Tract B ASLS 76-115 to the Army Dock in Monti Bay. A private drinking water well is within 500 feet but is not presently used. The City of Yakutat Public Water System drinking wells are within 700 lateral feet and are screened at depths of 325 and 345 feet.

Action Information

Action Date Action Description DEC Staff
5/11/1994 Update or Other Action (Old R:Base Action Code = SA1R - Phase I SA Review (CS/LUST)). Contamination appears confined by groundwater table. Possibility of contamination from off property. Report recommends Phase II and CAP. Former Staff
12/30/1994 Site Added to Database Diesel and gas range hydrocarbon contamination. Former Staff
11/17/1995 Site Ranked Using the AHRM Initial ranking. Sally Schlichting
2/5/1996 Update or Other Action (Old R:Base Action Code = SA2A - Phase II SA Approval / Release Investigation). Sampling, installation of remediation piping and facility upgrades to occur simultaneously. Groundwater will be investigated depending on results of sampling. Sally Schlichting
2/7/1997 Site Characterization Report Approved (Old R:Base Action Code = RI - Remedial Investigation). Release Investigation Report reviewed and approved. Sally Schlichting
2/7/1997 Update or Other Action (Old R:Base Action Code = SI - Site Investigation). Assessment of depth and areal extent of contaminated soil beneath the tank farm found contamination as deep as 14 feet in some areas. Sally Schlichting
1/29/1998 Site Characterization Report Approved Requested additional information be gathered in regard to off-site impacts, surface and groundwater impacts, and suspected localized impacted area near valve house. Sally Schlichting
7/8/1998 Site Characterization Workplan Approved Soil and GW investigation. Sally Schlichting
10/9/1998 Update or Other Action Cost Recovery Letter Issued this date. Sally Schlichting
8/5/1999 Site Characterization Report Approved Soil and GW investigation report. Approval letter asks for additional investigation and a number of other items. Sally Schlichting
4/24/2000 Document, Report, or Work plan Review - other ADEC received Ground Water Monitoring Report by R&M for sampling in July 1999 at site. The highest concentration of DRO detected was 14.9 mg/L in MW-1B at the former Truck Rack. The highest concentration of DRO in surface water samples was 1.0 mg/L in the sample from Seep-4, located west the dock bulkhead. Bruce Wanstall
10/10/2000 Update or Other Action Cost Recovery Memorandum sent to Kay R. for $1,019.86. Bill Janes
10/17/2001 Site Characterization Workplan Approved Additional GW investigation approved regarding 8/5/99 requiremnts. Mike Jaynes
6/28/2002 Update or Other Action RRM has been on-site all week. Difficulty installing monitoring wells due to bedrock or glacial eratic refusal. Terry G. informed me they became aware that ENSR has been doing work for the Corps in the immediate area. Old military fuel storage tanks and pipeline infrastructure may be co-mingling contamination. I sent an email to Deb Caillouet in Anchorage. RRM needs the ENSR report which should be completed soon. Bill Janes
1/1/2003 Update or Other Action Project manager changed to Wanstall. File and site review of status and ranking. Bruce Wanstall
1/7/2003 GIS Position Updated Marine transfer point and Tank Farm at ridge top above Monti Bay used to pinpoint site position on topographic map. Accuracy within 1.3 acre property in Tract D estimated at 100 meters. Bruce Wanstall
2/19/2003 Update or Other Action Meeting with new consultants for Chevron, SECOR plans well sampling events in June. Bruce Wanstall
7/9/2003 Long Term Monitoring Established Discussion with consultant; June monitoring well (MW) sampling report pending. December 02 MW sampling event report requested. Bruce Wanstall
12/11/2003 Update or Other Action Semi-annual monitoring event and site inspection. One of four seeps and 3 of 5 wells were able to be sampled under December conditions in Yakutat. Long term monitoring plan will be modified to capture peak seasonal ground water flow periods of April and October. Bruce Wanstall
12/15/2003 GIS Position Updated GPS location using North American Datum 27. Ocean Cape Road is at the marine head dock . Bruce Wanstall
4/23/2004 Update or Other Action December 2003 ground water monitoring report recieved and reviewed. Bruce Wanstall
9/22/2004 Update or Other Action Groundwater Monitoring Report arrived; quick review shows sampling methods and locations are consistent with workplan. Data includes TAH, TaqH, GRO, BTEX, DRO and PAHs. Bruce Wanstall
1/25/2005 Update or Other Action Groundwater Monitoring Report arrived; quick review shows sampling methods and locations are consistent with workplan. Data includes TAH, TaqH, GRO, BTEX, DRO and PAHs. Bruce Wanstall
3/9/2005 Update or Other Action SECOR 2004 Ground water monitoring Reports reviewed; adequate procedure, accuracy and QA/QC. Bruce Wanstall
5/3/2005 Update or Other Action Review Army Dock Area Site Plan Map - USACE consultant Shannon & Wilson installed monitoring wells in 2004 at former AST sites 2 and 3 on the adjacent property above the existing pipeline; postpone site visit to fall sampling event. Bruce Wanstall
9/19/2005 Update or Other Action Telecon with David Weigner of SECOR on Delta Western Wrangell. H mentioned that SECOR is heading to Yakutat to conduct monitoring in mid-November. Bill Janes
2/3/2006 Long Term Monitoring Established Reviewed conclusions of the First and Second Semi-Annual 2005 Groundwater Monitoring Reports by SECOR. Letter sent to the RP instructing that future semi-annual goundwater monitoring sampling will change from a summer/ winter to spring/ fall schedlue and annual trend analysis on data is requested. Bruce Wanstall
10/6/2006 Update or Other Action Cost recovery check received in the amount of $634.04 Bill Janes
11/22/2006 Update or Other Action Received and reviewed the first 2006 semi-annual water monitoring report. Requested that Cambria re-evaluate the semi-annual groundwater sampling project laboratory data and try the CS approval checklist again. Then provide recommendation of data usability. Bruce Wanstall
1/18/2007 Update or Other Action Review Revised First Semi-Annual 2006 Groundwater Monitoring Report by Cambria Environmental Inc dated January 2007. Laboratory data check-listed. Bruce Wanstall
1/29/2007 Update or Other Action Review Revised Second Semi-Annual 2006 Groundwater Monitoring Report by Cambria Environmental Inc dated January 2007. Laboratory data check-listed. Bruce Wanstall
7/3/2007 Exposure Tracking Model Ranking Initial and current ETM ranking completed using the 1997 Phase I & 1998 Phase II Cleanup Reports for the soil pathways and the follow-up ground water assessment and long term monitoring data for the water pathways. Controlling pathway is ground water ingestion that is assessed annually using ground water monitoring data. Emailed an inquiry about plans to sample the wells in 2007 to Chevron and Conestoga-Rovers Associates. Bruce Wanstall
8/15/2007 Update or Other Action ADEC received File Review Report from CRA concerning the Delta Western Facility (Former Chevron Bulk Terminal #20-6270) at Monti Bay in Yakutat. The file review covers history and operations on the former Yakutat Air Force Base (YAFB) located on the adjacent property to the south. Recent environmental assessment indicates that petroleum contamination on the YAFB may have impacted the Delta Western Facility property. Bruce Wanstall
10/29/2007 Update or Other Action First Semiannual 2007 Groundwater Monitoring Report by Conestoga Rovers & Associates dated October 2007 was reviewed by the ADEC for laboratory data checklist. Request for data made to CRA by email. Bruce Wanstall
10/31/2007 Update or Other Action Received the sample chain of custody for the First Semi Annual GMR; data meets ADEC quality assurance/control standards. Bruce Wanstall
1/16/2008 Update or Other Action ADEC evaluated the conceptual site model completed by CRA for Chevron (responsible party). The conceptual site model is consistent with the ETM pathway evaluation conclusions for current and future exposure with one exception. Adjustments were made to the ETM ranking to recognize the CR&A conclusion that several intertidal seep locations do complete the surface soil ingestion/dermal exposure pathway; but ADEC concluded that risk was de-minimis in part because the duration of exposure time is limited to twice per day low tide intervals. Bruce Wanstall
3/19/2008 Update or Other Action ADEC reviewed the Second Semiannual 2007 GMR by CRA; data do not meet ADEC quality assurance standard; requests for case narrative made in letter to the consultant. ADEC concurs with the report conclusion to continue semiannual monitoring and sampling in 2008. Bruce Wanstall
7/7/2008 Update or Other Action ADEC approves the proposed plan to dispose of purged groundwater in the on-site facility oil/water separator during the semiannual sampling events in 2008 at the Delta Western/Former Chevron Bulk Plant 20-6270. Bruce Wanstall
7/8/2008 Site Characterization Workplan Approved ADEC has reviewed and approves the proposed subsurface characterization sampling workplan for mid-July, 2008 at the Delta Western/Former Chevron Bulk Plant 20-6270 site. Bruce Wanstall
9/15/2008 Update or Other Action ADEC reviewed current status of adjacent properties, current land use and historical monitoring well data to consider a responsible party request to reduce the number of sampling sites based on consecutive seasonal sampling events with POL concentrations below regulatory benchmarks. Approval of the request was sent to the RP consultant by email to take effect immediately for the fall 2008 sampling event in Yakutat taking place this week. Bruce Wanstall
6/17/2009 Document, Report, or Work plan Review - other ADEC has approved the data quality and the CRA 2008 ground water monitoring reports. Naphthalene results for water sample and duplicate from MW-5 for the 2nd semi-annual event are considered an estimate of the true value. Bruce Wanstall
7/30/2009 Document, Report, or Work plan Review - other ADEC has reviewed and approves the data quality in the 2008 Subsurface Investigation Report by Conestoga-Rovers & Associates(CRA). CRA subsurface investigation advanced borings that correspond with previous subsurface investigation at the former truck rack and valve house sites. A historical sample collected near monitoring well MW-5 at the bulkhead at a depth of 5.5 feet had GRO concentration of 377 mg/kg and a DRO concentration of 5,590 mg/kg. The corresponding 2008 soil sample CB-5 from a depth of 6.5 feet had DRO concentration of 249 mg/kg. Soil boring CB-3, located between monitoring wells MW-2 and MW-5 was advanced to 3 feet BGS; the soil sample had a DRO concentration of 3,200 mg/kg and benzene concentration of 0.173 mg/kg. A historical soil sample collected at the former valve house at MW-2 at a depth of 1.5 feet had DRO concentration of 1,380 mg/kg and a second sample at 3.5 feet BGS had a DRO concentration of 6,650 mg/kg. The corresponding 2008 soil sample CB-2 collected at a depth of three feet had a DRO concentration of 599 mg/kg and a benzene concentration of 0.0422. A historical soil sample collected near monitoring wells MW-1A and MW-1B had a DRO concentration of DRO at 9,930 mg/kg; the corresponding 2008 soil sample CB-9 from a depth of 9.5 feet had concentrations of DRO at 2,280 mg/kg, representing a four-fold reduction. A historical soil sample collected near the former well house from a depth of seven feet had a DRO concentration of 1,350 mg/kg; the corresponding 2008 soil sample CB-6 from 4.5 feet BGS had a DRO concentration of 9,630 mg/kg and a GRO concentration of 196 mg/kg. Bruce Wanstall
12/15/2009 Document, Report, or Work plan Review - other ADEC reviewed and approved by letter the data quality in the First Semiannual 2009 Groundwater Monitoring Report at the Delta Western Yakutat contaminated site. The Conestoga-Rovers & Associates (CRA) Report monitors petroleum ground water contamination. Laboratory Method PQLs for the requested petroleum hydrocarbon analytes and petroleum hydrocarbon analyte concentrations in each of the samples tested had results that are below applicable 18 AAC 75.345 Table C cleanup levels. TAH and TAqH results in MW-2 were non-detect and 0.617 ug/L respectively. TAH and TAqH results in MW-5 were 5.11 and 51.6 ug/L respectively. The TAH and TAqH WQ Stds are 10 and 15 ug/L respectively. Bruce Wanstall
6/22/2010 Document, Report, or Work plan Review - other The 2nd semi-annual 2009 ground water monitoring report by Conestoga Rovers & Associates meets ADEC field and laboratory quality assurance criteria and is approved. The 2010 well sampling schedule is reduced from semi-annual to annual frequency. Bruce Wanstall
8/18/2010 Long Term Monitoring Complete ADEC approves the CRA request to decommission groundwater monitoring wells MW-1A, MW-1B, MW-2, MW-4 and MW-5 at the Delta Western/former Chevron Bulk Fuel Terminal on Ocean Cape Road. Although subsurface petroleum contamination remains beneath the former tank farm, former truck rack and former valve house areas of concern, data from more than ten years of successive ground water monitoring events indicate that the potential for migration of subsurface contaminates is not unacceptable. GRO, DRO, RRO and BTEX compound concentrations have been stable or in decline below ADEC Table C Groundwater Cleanup Levels in samples collected from MW-2 and MW-5 for at least four consecutive sampling events. Bruce Wanstall
9/29/2010 Update or Other Action Monitoring well destruction and site visit scheduling was discussed with CRA by telephone; it became evident that the CRA Delta Western Yakutat Cleanup Complete with Institutional Controls Request document dated 5/25/2010 had not reached DEC. A digital copy of the CRA Request for Chevron was received today. Bruce Wanstall
1/5/2011 Update or Other Action Conestoga Rovers & Associates Site Summary Report for the Delta Western Terminal-Yakutat was received electronically today. Bruce Wanstall
1/10/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72957 Bulk Fuel Tank Farm - Above Ground . Bruce Wanstall
1/27/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72957 Bulk Fuel Tank Farm - Above Ground . Bruce Wanstall
5/10/2011 Cleanup Complete Determination Issued Investigation and monitoring has shown that surface soil, surface water, and groundwater at the site all meet the designated cleanup levels that are protective of human health and ecological receptors but in a few locations subsurface soil still has diesel contamination in concentration that exceeds the human health based cleanup levels. Even though the site is issued Cleanup Complete status on the Contaminated Sites Database, Institutional Controls (ICs) are established to limit access that could lead to exposure. Via this determination, the properties are subject to regulatory restrictions that will ensure that the pockets of residual contamination will remain undisturbed indefinitely. No further remedial action will be required provided that specific ICs are established and maintained at these site locations. The CS Institutional Control (IC) Unit is will record a Notice of Environmental Contamination at the Recorder’s Office in Juneau, Alaska for each of the properties at the site. If future development requires excavation of any of the contaminated areas on these properties, the property owner is required to contact the IC Unit and obtain approval before any work begins to ensure regulatory requirements are met and that human health and safety and the environment are protected. Bruce Wanstall
5/10/2011 Institutional Control Record Established Institutional Controls established and entered into the database. Bruce Wanstall
7/19/2011 Update or Other Action DEC has received by certified regular mail the Institutional Control Agreement Signature Page from Chevron Environmental Management Company pertaining to the DEC Decision Closure Agreement dated May 6, 2011 for the Delta Western Yakutat property (Chevron Station No. 20-6270). Bruce Wanstall
6/19/2014 Institutional Control Update Certified letter received today from the Delta Western Seattle office provided DEC with notice that there have been no land use or ownership change at the bulk fuel tank farm property at Monti Bay in Yakutat. There has been construction replacing the old Army Dock and a new pipeline from the tanks to the marine head. Bruce Wanstall
10/9/2014 Institutional Control Compliance Review IC compliance review conducted and staff changed from Bruce Wanstall to IC Unit. Reminder system set to follow-up with the responsible party in 2017. Kristin Thompson
6/15/2016 Institutional Control Compliance Review An IC compliance review was conducted. A letter requesting the signed ICs Agreement and Signature Page was issued to Delta Western Incorporated on this date. Kristin Thompson
6/21/2016 Institutional Control Update ADEC received the signed ICs Agreement Page from Delta Western incorporated. Kristin Thompson
8/12/2019 Institutional Control Compliance Review An Institutional Controls reminder letter was e-mailed to the landowner on this date. Compliant response letter received from Delta Western, LLC dated 9/20/19. Mossy Mead
9/1/2022 Institutional Control Compliance Review An IC compliance letter was received on this date from Delta Western. This documented confirmed that all ICs are in compliance and there have been no land use changes since the last verification. Evonne Reese

Contaminant Information

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

Control Type

Type Details
Notice of Environmental Contamination DEC will record the NEC at the Recorders office in Juneau, Alaska; a copy of the final document will be attached to the CS database record.
Signed CS Determination The responsible party, Chevron, and the facility owner, Delta Western are each asked to return a signed original Cleanup Complete-ICs Agreement and Signature page to the DEC project manager within 30 days of receipt of the letter.

Requirements

Description Details
Advance approval required to transport soil or groundwater off-site. Any proposal to transport soil or groundwater off site requires DEC approval in accordance with 18 AAC 75.325 (i). A “site” [as defined by 18 AAC 75.990 (115)] means an area that is contaminated, including areas contaminated by the migration of hazardous substances from a source area, regardless of property ownership.
Groundwater Use Restrictions Installation of groundwater wells will require approval from DEC
Excavation / Soil Movement Restrictions Movement or use of contaminated material in a manner that results in a violation of 18 AAC 70 water quality standards is prohibited.
When Contaminated Soil is Accessible, Remediation Should Occur Soil contamination is located under the bulk fuel tanks liner and under the fuel terminal pipeline. When structures are removed and/or the soil becomes accessible, the soil must be evaluated and contamination addressed in accordance with a DEC approved work plan.
Other Any future change in land use may impact the exposure assumptions cited in this document. If land use and/or ownership changes, current ICs may not be protective and DEC may require additional remediation and/or ICs. Therefore Delta Western shall report to DEC every three years beginning May 2014 to document ownership and land use or report as soon as Delta Western becomes aware of any change in land ownership and/or use, if earlier. The report can be sent to the local DEC office or electronically to DEC.ICUnit@alaska.gov.
Hazard ID Site Name File Number
3716 Yakutat AFB Army Dock & Piping 1530.38.011

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