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Site Report: ADOT&PF Regional Complex Juneau

Site Name: ADOT&PF Regional Complex Juneau
Address: 6860 Glacier Hwy, Juneau, AK 99801
File Number: 1513.26.052
Hazard ID: 25131
Status: Active
Staff: Kris Dent, 9072623411 kris.dent@alaska.gov
Latitude: 58.359978
Longitude: -134.525950
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

Contaminated soil was left in place after closure by removal of 5 regulated underground storage tanks in 2000. A network of ten monitor wells was installed in 2003 and release investigation sampling of soil borings and groundwater detected elevated levels of gasoline range hydrocarbons and benzene in five of the well sites and elevated levels of diesel range hydrocarbons in seven of the well sites. During construction of a new office building on the property gasoline vapors were observed in trenches to connect utility services. Subsequent Site Investigation in 2007 and 2008 into vapor intrusion to indoor air from petroleum in soil and groundwater found the exposure pathway incomplete for all the compounds of concern. Concurrent sampling of groundwater found that hydrocarbon levels in all wells were declining. Socks filled with oxygen release compounds (ORC) were installed in five of the wells to enhance microbial breakdown of contaminated soil and groundwater by monitored natural attenuation (MNA). Additional groundwater sampling was completed in 2007, 2010,and 2013, to further characterize residual petroleum contamination and effectiveness of the ORC enhanced MNA cleanup remedy. Although residual contamination levels were reduced, samples from seven of eight wells still had levels of petroleum above the Table C regulatory screening levels. Additional MNA monitoring for declining contamination is needed to ensure the site does not pose an unacceptable risk to human health or the environment.

Action Information

Action Date Action Description DEC Staff
5/12/2000 Site Added to Database Former Staff
5/12/2000 Update or Other Action Horwath gave permission to Smith Bayliss LeResche to transport 100 cy of soil to USR in Juneau. Bill Janes
5/12/2000 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77612 USTs #2A (550gal waste oil), #3 (3000gal diesel), and #4(3000gal gasoline) removed and disposed. Chlorinated solvents, BTEX, GRO, and DRO impacts to soils detected. Former Staff
12/11/2000 Leaking Underground Storage Tank Cleanup Initiated - Petroleum USTs # 5 (4000gal gasoline) and #2B (550gal waste oil) removed and disposed. GRO, BTEX, and DRO impacts to soils detected. Bruce Wanstall
10/2/2001 Update or Other Action Changed Project Manager from Paul Horwath to Bill Janes Cynthia Pring-Ham
12/12/2001 Update or Other Action Changed Project Manager from Janes to Bruce Wanstall Bill Janes
7/23/2002 Document, Report, or Work plan Review - other File review and update database for events and status of site and conditions. No direct contact with department by RP concerning soil transported to USR for remediation in May 2000 or concerning soil stockpiled in Dec 2000 from UST#5 gasoline excavation. Bruce Wanstall
8/21/2002 Update or Other Action RECKEY has automatically been generated. Cynthia Pring-Ham
1/9/2003 Release Investigation Environmental Site Assessment Workplan received. Brief review indicates that it corresponds to approved scope of work proposal. Bruce Wanstall
1/16/2003 Document, Report, or Work plan Review - other Review of Site Assessment Workplan and RFP. Bruce Wanstall
1/23/2003 Underground Storage Tank Site Characterization or Assessment Site Assessment/Investigation Workplan approved by letter. Soil borings, groundwater monitoring wells and soil vapor sampling. Bruce Wanstall
2/13/2003 Site Visit Site visit to observe and advise on installing nine wells to investigate residual soil and groundwater contamination. Soil boring sample screening indicates pattern of petroleum contamination migrating with groundwater on the property. Samples will be collected for laboratory analysis. Bruce Wanstall
5/23/2003 Document, Report, or Work plan Review - other The AMHS blg is downgradient of UST#5 where 250ppm benzene was detected in soils left in-place. April 03 GW well installation and sampling found elevated Benzene in 5 wells. Indications are that benzene in the groundwater is migrating in the direction of the AMHS Blg. Bruce Wanstall
6/23/2003 Release Investigation Release Investigation contractor workplan approved. Bruce Wanstall
10/23/2003 Release Investigation Field activities include indoor ambient air sampling and assessment; groundwater monitoring well sampling for target analytes. Bruce Wanstall
3/19/2004 Release Investigation Requested and received by email the S&W January 2004 Report of the October 2003 indoor air assessment and groundwater monitoring event that includes assessment of groundwater for natural attenuation parameters. Bruce Wanstall
3/2/2005 Update or Other Action Web Site Summary drafted for the LUST site status; review of S&W 2004 Report of the 10/03 Field Activities. Bruce Wanstall
5/12/2005 Update or Other Action GIS Location update using topo map and web based program; NAD 27 datum used; accuracy is estimation only. Bruce Wanstall
9/12/2006 Update or Other Action Review technical reports on vapor intrusion pathway (VIP) assessment to evaluate the workplan design for indoor air exposure assessment of the office buildings at the facility. Bruce Wanstall
10/4/2006 Update or Other Action ADOT&PF SE Regional Complex RFP. NTP, and SLR Final Proposal reviewed, correction added and emailed to CS Contracting; ready for management review. Bruce Wanstall
11/8/2006 Update or Other Action Groundwater Montitoring Plan approved; funding arranged; NTP pending. Bruce Wanstall
12/7/2006 Update or Other Action NTP issued to SLR and workplan for monitoring well sampling and soil vapor sub-slab sampling will be submitted for approval by mid- January; field work to follow late in January or early February. Bruce Wanstall
2/8/2007 Exposure Tracking Model Ranking Baseline ranking for the multiple former UST sources has been completed. Bruce Wanstall
4/5/2007 Update or Other Action Review literature on sub-slab soil vapor sampling techniques and Johnson Ettinger modeling parameters for comment and approval of the proposed site sampling workplan for 2007. Bruce Wanstall
5/4/2007 Update or Other Action GIS data corrected using ArcMap and aerial photographs with personal site knowledge; scale 1:10,000; accuracy within 50 meters is within the facility property boundary. Bruce Wanstall
2/21/2008 Update or Other Action Review the scope of work for 2008 sampling plan for the 2008 RFP; approve and forward to RFA Contract Management for NTP Bruce Wanstall
4/21/2008 Update or Other Action Review and approve monitoring well and vapor intrusion sampling workplan for the ADOT&PF Regional Complex Juneau Bruce Wanstall
5/2/2008 Site Visit Vapor intrusion and ground water well monitoring event Bruce Wanstall
10/22/2008 Document, Report, or Work plan Review - other Ground water monitoring of all wells and field testing of ambient air in one of the occupied buildings on the property was completed in 2008. Results indicate that benzene and gasoline range hydrocarbon concentrations in groundwater between the source area and occupied buildings are declining with ORC active treatment. Indoor air exposure from the soil vapor intrusion pathway is not a current risk for occupants of the building. Although PCE was detected in sub-slab soil vapor in concentrations above the EPA screening levels, the compound was not detected in ambient indoor air samples. PCE is used in vehicle maintenance but has not been a site assessment contaminant of concern for the property. Bruce Wanstall
4/3/2009 Update or Other Action The site is long term monitoring of residual soil and groundwater contamination that is attenuating as a result of active treatment. Proposed sampling of the monitoring wells will be completed when funding is available in FY2010 Bruce Wanstall
9/29/2009 Document, Report, or Work plan Review - other Complete a site summary of the CIP indoor air assessment for the vapor intrusion pathway at the ADOT&PF Regional Complex Bruce Wanstall
5/7/2010 Update or Other Action FY10 field work includes additional groundwater sampling to monitor declining hydrocarbon contamination to ensure that off-site migration pathways are protected. The objective of periodically monitoring the ground water for contamination is to establish a trend over time to determine if residual petroleum contamination is expanding, stable or in decline. If the data indicate an expansion of contamination then additional assessment and/or cleanup action will be performed to ensure the site does not pose an unacceptable risk to human health or the environment. Bruce Wanstall
7/2/2010 Document, Report, or Work plan Review - other ADEC evaluation of the letter-report titled June 2010 Groundwater Sampling, ADOT&PF Southeast Regional Complex, 6860 Glacier Highway, Juneau, Alaska by Shannon & Wilson finds the data meet field and laboratory quality assurance criteria. ORC socks were removed from wells B4MW through B7MW at least one hour before purging and sampling. At least three well casing volumes were purged from each well prior to sampling. Due to unusually dry conditions in May, many of the wells purged dry and some of the wells did not recover to at least 80% of the pre-purge volume prior to collecting the water samples. When stable conditions were reached after purging, a submersible pump and dedicated tubing was used to collect samples from the wells; volatile samples with no headspace were collected first. Five 1-foot sections of ORC socks joined with a nylon rope were installed in wells B4MW, B5MW, B6MW and B7MW. The samples and a duplicate were laboratory analyzed for BTEX, GRO, DRO, & RRO. Samples from B2MW and B4MW were also analyzed for VOCs. Samples from seven of the eight monitoring wells sampled contained concentrations of petroleum compounds that exceed the 18 AAC 75.345 Table C screening levels. Seventeen VOC compounds were detected in the project samples, but the concentrations were less than the Table C screening levels. Bruce Wanstall
7/2/2010 Document, Report, or Work plan Review - other ADEC evaluation of the letter-report titled June 2010 Groundwater Sampling, ADOT&PF Southeast Regional Complex, 6860 Glacier Highway, Juneau, Alaska by Shannon & Wilson finds the data meet field and laboratory quality assurance criteria. ORC socks were removed from wells B4MW through B7MW at least one hour before purging and sampling. At least three well casing volumes were purged from each well prior to sampling. Due to unusually dry conditions in May, many of the wells purged dry and some of the wells did not recover to at least 80% of the pre-purge volume prior to collecting the water samples. When stable conditions were reached after purging, a submersible pump and dedicated tubing was used to collect samples from the wells; volatile samples with no headspace were collected first. Five 1-foot sections of ORC socks joined with a nylon rope were installed in wells B4MW, B5MW, B6MW and B7MW. The samples and a duplicate were laboratory analyzed for BTEX, GRO, DRO, & RRO. Samples from B2MW and B4MW were also analyzed for VOCs. Samples from seven of the eight monitoring wells sampled contained concentrations of petroleum compounds that exceed the 18 AAC 75.345 Table C screening levels. Seventeen VOC compounds were detected in the project samples, but the concentrations were less than the Table C screening levels. Bruce Wanstall
1/5/2011 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77612 USTs. Bruce Wanstall
3/23/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77612 USTs. Bruce Wanstall
7/16/2013 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77612 USTs. Bruce Wanstall
4/9/2014 Document, Report, or Work plan Review - other DEC approved the 2013 monitor well sampling report by Shannon & Wilson for final payment. Bruce Wanstall
1/5/2018 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77612 USTs. Danielle Duncan
2/5/2018 Update or Other Action Sent out a request for a work plan today certified: 7017 1450 0002 0295 6027. The last work done on site was in October of 2013. At that time, the groundwater was sampled and contaminants at concentrations above ADEC cleanup levels were measured in multiple wells. The benzene concentrations were elevated in many of the wells and the highest concentration measured was 0.26 mg/L which is above the commercial vapor intrusion screening level of 0.069 mg/L. This indicates that there may be an ongoing vapor intrusion hazard to indoor air. Please submit a site characterization and groundwater monitoring work plan for ADEC review pursuant to 18 AAC 75.335 developed by a qualified environmental professional to investigate soil and groundwater contamination in addition to the vapor intrusion risk within 30 days of receipt of this letter. Danielle Duncan
2/7/2022 Meeting or Teleconference Held Met with DOT and consultant. Requested building surveys from vapor intrusion guidance. DOT will submit a work plan for VI sampling and additional groundwater sampling. Lisa Krebs-Barsis
3/29/2022 Site Characterization Workplan Approved The Sampling and Analysis Plan, submitted March 8, revised per DEC comments and finalized March 28, 2022 was approved verbally March 29, 2022. The plan includes three indoor air samples from each building and a subslab soil gas sample from the AMHS building. Groundwater samples would be collected from nine of the remaining monitoring wells that can be located. Lisa Krebs-Barsis
6/22/2022 Potentially Responsible Party/State Interest Letter A letter notifying the ADOT&PF of their status as a Potential Responsible Party was submitted on 6/22/2022. Flannery Ballard
7/25/2022 Document, Report, or Work plan Review - other The ADEC reviewed the "Indoor Air Quality Site Assessment Report", dated June 21, 2022 and submitted to the ADEC on June 22, 2022. The ADEC provided comments which should be addressed before the report is resubmitted for review. Flannery Ballard
11/9/2022 Site Characterization Report Approved The ADEC approved the "Indoor Air Quality Site Assessment Report", dated September 26, 2022. The report summarized the vapor intrusion investigation activities that occurred at the site in February and May 2022. 7 indoor air samples were taken between the 7 mile building and the AMHS building. 1 sub-slab sample was taken beneath the men's bathroom in the AMHS building where there have been previously documented elevated levels of PCE. Analytical results demonstrated that all sub-slab and indoor air samples were below ADEC target levels. As vapor intrusion has now been investigated at the site through indoor air sampling in 2003, 2007, 2008, and 2022 and through sub-slab sampling in 2007, 2008, and 2022, the ADEC determines that investigation into vapor intrusion may cease at the site. If site conditions or building usage changes, additional investigations into vapor intrusion may be necessary. The report is approved and uploaded to the database. Flannery Ballard

Contaminant Information

Name Level Description Media Comments

Control Type

Type Details

Requirements

Description Details
Hazard ID Site Name File Number
1177 ADOT&PF Juneau Equipment Yard 1513.38.024

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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