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Site Report: Anchor Point Texaco

Site Name: Anchor Point Texaco
Address: 34080 Sterling Highway, Downtown Anchor Point, Anchor Point, AK 99556
File Number: 2302.26.001
Hazard ID: 23429
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 59.778436
Longitude: -151.832873
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

In 1979, ADEC received complaints of gasoline in two drinking water wells in Anchor Point. A lack funding and staffing prevented any further ADEC action. In 1986 & 1987, DEC conducted field investigations which identified a fuel service station to be the source of the gasoline contamination. The station was located on Lots 11 and 12 of the SJ Chapman 1959 Addition, Anchor River Subdivision. Benzene was detected in nine drinking water wells spanning a distance of 1/4 mile, from the Anchor Point Post Office to the Anchor River Inn. The contaminated groundwater aquifer was the sole source drinking water aquifer for the affected area. ADEC learned that Texaco Oil Company owned the UST systems during the period of time when gasoline was released to the environment, so Texaco became responsible for responding to this pollution incident. In the 1990s, Texaco performed additional assessment and cleanup work at the site. In addition, ADEC Village Safe Water grant funds were obtained by the Anchor Point Safe Water Corporation, a locally formed non-profit corporation, for purposes of installing a community water system. Community water mains were installed in the area that was affected by the contaminated groundwater, providing a safe source of drinking water. The two properties currently without direct access to community water mains are Lots 12 and 13 of the SJ Chapman 1959 Addition, Anchor River Subdivision. Texaco eventually reimbursed the State for its costs for installing the community water system, as well as ADEC's costs for responding to this incident. In the late 1990s, Texaco performed a risk assessment and ADEC accepted the conclusions of that risk assessment. ADEC issued a conditional site closure (NFRAP) in August 2000. Under the conditions of the ADEC conditional closure, Texaco remains liable for soil contamination in the Sterling Highway R-O-W, and is required to continue monitoring groundwater quality on a triennial schedule (once every three years) until groundwater concentrations meet the applicable ADEC cleanup levels. Residual groundwater contamination remains in the Sterling Highway R-O-W and on some properties adjacent to the Sterling Highway. Residual soil contamination remains in the Sterling Highway R-O-W, in front of the facility. Texaco's next groundwater quality sampling event is to be performed in 2006. Updated 12/1/05 by Horwath.

Action Information

Action Date Action Description DEC Staff
5/2/1986 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 76235 ADD; Former Staff
5/2/1986 Site Added to Database Former Staff
5/3/1986 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; :LCAU Date changed DB conversion Former Staff
8/14/1986 Release Investigation SI; Anchor Point Hydrological Study, August 14, 1986, by Mike Taurianen Consulting Engineers, groundwater flow direction. Former Staff
6/1/1988 Release Investigation SI; Anchor Point Groundwater Contamination Report, dated June 1988 by Paul Horwath of ADEC. The former Anchor Point Texaco facility is determined to be the source of the gasoline pollution of of the groundwater and the drinking water wells in Anchor Point. Groundwater contamination is present in the confined aquifer over an area > 450' x 1200' with the highest detected total BTEX concentration of 25,300 ppb, and the highest detected benzene concentration of 541 ppb. Former Staff
9/27/1988 Release Investigation SI; Remediation Investigation Program, Phase I, Anchor Point, Alaska, February 1989, by Hart-Crowser, approximately 5200 cubic yards of contaminated soil estimated to be impacted at the site. Former Staff
10/10/1988 Long Term Monitoring Established MS; Additional field investigation to assess the total extent of soil contamination. Former Staff
10/10/1988 Leaking Underground Storage Tank Corrective Action Underway RAPR; Hart Crowser prepares remedial action recommendations for ADEC. Former Staff
1/1/1990 Release Investigation SI; A Kenai Special Projects Summary was prepared for this project in January 1990, by ADEC. Former Staff
6/14/1991 Update or Other Action REM; ENSR, on behalf of Texaco, submitted a request for transport and disposal of soil cuttings from soil borings. Soils were placed in 6 overpack drums & transported to Anchorage for disposal at Alaska Soil Recycling. Former Staff
10/15/1993 Release Investigation RELR; Additional release investigation work performed at the site. Former Staff
3/25/1994 Update or Other Action LCAR; ADEC letter issued regarding assessment data reporting associated with 4,000 tons of contaminated excavated soils. Letter also dealt with the plans for the installation of a soil vapor extraction treatment system. Former Staff
3/25/1994 Leaking Underground Storage Tank Corrective Action Underway LCAR; ADEC letter issued regarding the characterization, transport, and thermal treatment of drill cuttings that accumulated at the project site over the past several years. Former Staff
3/25/1994 Leaking Underground Storage Tank Corrective Action Underway LCAR; ADEC letter issued covering the submittal of as-built drawings for installation of the soil vapor extraction system treatment system, and drawings depicting remaining soil contamination at the project site. Former Staff
3/25/1994 Update or Other Action CAPR; ADEC letter addressed treatment and disposal of 4,000 tons of excavated contaminated soils, and plans for installation of an in-situ treatment system at this project site. Letter issued regarding groundwater monitoring program work plan. Former Staff
12/6/1995 Underground Storage Tank Site Characterization or Assessment SA1A; Action and actiondt entered from excel spreadsheet. Former Staff
6/7/1996 Risk Assessment ADEC received a risk assessment report from Texaco's consultant. Former Staff
8/24/2000 Long Term Monitoring Established Long-term groundwater (GW) monitoring is required as a condition of the August 2000 ADEC NFRAP determination. Texaco is required to perform GW monitoring on a triennial basis until GW meets the applicable ADEC GW cleanup levels. Former Staff
8/24/2000 Conditional Closure Approved After a concerted public notification and participation process, ADEC issued a NFRAP determination, which includes specific conditions. Final site closure is not possible due to residual groundwater contamination exceeding ADEC 18 AAC 75.345, Table C cleanup levels, and residual soil contamination in the Sterling Highway R-O-W exceeding ADEC 18 AAC 75.341, Method 2 soil cleanup levels. Texaco is required to perform long-term groundwater monitoring on a triennial basis (once every three years), until GW concentrations meet applicable cleanup levels. Texaco remains liable for soil contamination present in the Sterling Highway R-O-W adjacent to this facility. Paul Horwath
6/23/2003 Long Term Monitoring Established ADEC received the Texaco (now Chevron) June 27, 2003 Groundwater Monitoring and Sampling Report for the May 31, 2003 groundwater sampling event. Groundwater concentrations were significantly reduced from the year 2000 groundwater sampling event. GRO exceeded groundwater cleanup levels in two monitoring wells. The detection limits for benzene in these two MWs were 10 and 20 ug/L due to the elevated GRO concentrations. Groundwater concentrations continue to demonstrate the established declining trend. Paul Horwath
7/27/2004 Update or Other Action File number assigned and entered into the Fileroom DB and LUST DB. Alyce Hughey
12/13/2005 Update or Other Action Using Figure 1 from the Results of Annual Ground Water Monitoring and Sampling July 2000, from Geo Engineers, dated October 23, 2000, in conjunction with TopoZone Pro and the KPB Parcel Lookup, entered the coordinates for this site. Metadata includes No Topo Basemap, TopoZone Pro Street Maps, Black and White Aerial Photo, on a Medium Size Map, View Scale 1:10,000, Coordinate Datum NAD83. High degree of confidence in accuracy of location. Alyce Hughey
1/9/2006 Institutional Control Record Established Institutional Control consists of this CS database notation that residual soil and groundwater contamination remains at this site, as well as ADEC's August 24, 2000 NFRAP determination letter. Paul Horwath
6/15/2007 Document, Report, or Work plan Review - other Reviewed Cambria's Well Installation and Destruction Report dated February 22, 2007. The report covers the installation of a replacement monitoring well MW-22R to replace destroyed monitoring well MW-22, and the decommissioning of air sparge well AS-MW-3. Benzene was detected in MW-22R at a concentration of 15 ug/L. Groundwater will be sampled on an annual basis rather than a triennial basis going forward, at Chevron's request. Paul Horwath
8/28/2007 Update or Other Action Issued approval to transport 4-55 gallon drums of soil to ASR in Anchorage for thermal treatment. Issued a closure letter stating that no furthe action was required of Chevron for these soils and that ASR was now responsible for proper treatment and disposal of the soils. Paul Horwath
1/10/2008 Document, Report, or Work plan Review - other Reviewed the Conceptual Site Model, Anchor Point Texaco, from Connestoga-Rovers Associates, dated December 5, 2007. There were some errors noted in this CSM and comments were forwarded to Connestoga-Rovers. Paul Horwath
1/11/2008 Document, Report, or Work plan Review - other Reviewed the Annual 2007 Groundwater Monitoring Report, dated November 15, 2007, prepared by Connostoga-Rovers & Associates. Groundwater trend and quality continues to improve. Only monitoring wells #13 and #19 exceeded ADEC groundwater cleanup levels (for GRO and/or benzene). Paul Horwath
2/21/2008 Document, Report, or Work plan Review - other Reviewed the Conceptual Site Model, Anchor Point Texaco report prepared by Conestoga-Rovers & Associates, dated February 5, 2008. This CSM was received February 14, 2008, and was a revised, resubmitted conceptual site model since the original CSM received December 14, 2007 contained errors. Paul Horwath
9/24/2008 Update or Other Action Authorized the transport and disposal of on drum of monitoring well purge waters to Emerald Environmental Service's facility in Anchorage. Paul Horwath
10/22/2008 Update or Other Action Approved the suspension of sampling of the monitoring wells MW-1, MW-2, MW-6, and MW-9. MW-13, MW-19, and MW-22R will continue to be sampled on a quarterly basis. Paul Horwath
12/1/2008 Update or Other Action Reviewed the First Quarter 2008 Groundwater Monitoring Report, dated September 11, 2008 from Conestoga-Rovers & Associates for Paul Horwath and provided him with a summary for his review and oversight. Site conditions remaine stable with an overall trend showing that the groundwater concentrations are decreasing. GRO showed quite a decrease in MW-19, while MW-22R had quite ann increase in GRO during this monitoring event that exceeded the groundwater cleanup levels. Alyce Hughey
1/7/2009 Document, Report, or Work plan Review - other Reviewed the Second Quarter 2008 Groundwater Monitoring Report, the Third Quarter 2008 Groundwater Monitoring Report, and the Fourth Quarter 2008 Monitoring Report for Paul Horwath for his review and oversight. Site conditions remain stable with a continual trend in decreasing groundwater contamination, however, MW-19 is still detecting GRO and Benzene above the groundwater cleanup levels, where MW-22R now detects GRO below the groundwater cleanup levels. Alyce Hughey
9/9/2009 Document, Report, or Work plan Review - other Reviewed the First Semiannual 2009 Groundwater Monitoring Report, dated August 10, 2009, from Conestoga-Rovers & Associates for Paul Horwath. Site conditions are remaining stable with an overall decrease in groundwater concentrations since the start of the project. MW-13 detected GRO above the groundwater cleanup levels during this sampling event, and it had been three years since the concentrations exceeded the groundwater cleanup levels. Groundwater sampling went from quarterly in 2008 to semiannually in 2009. Continual groundwater monitoring will continue to evaluate the sites groundwater conditions. Alyce Hughey
2/22/2011 Document, Report, or Work plan Review - other Reviewed the Annual Groundwater Sampling and Well Decommissioning Report, dated December 7, 2010, from Conestoga-Rovers & Associates. One June 3rd through June 4th, 2010 five monitoring wells were decommissioned, MW-1, MW-2, MW-6, MW-9 and MW-22R. The two remaining monitoring wells MW-13 and MW-19 were sampled with analytical results detecting Benzene and GRO above the groundwater cleanup levels in both sampled wells. Annual groundwater monitoring will continue in monitoring wells MW-13 and MW-19 using a no-purge method according to the ADEC approval on May 28, 2010. Alyce Hughey
1/25/2012 Document, Report, or Work plan Review - other Reviewed the Annual 2011 Groundwater Monitoring and Sampling Report, dated December 23, 2011, from Conestoga-Rovers & Associates. On September 14, 2011 the two remaining monitoring wells MW-13 and MW-19 were sampled using the no-purge method of groundwater sampling as approved by ADEC on May 28, 2010. Benzene was detected at 0.0056 and 0.0065 mg/L and GRO was detected at 3.6 mg/L. Annual groundwater monitoring and sampling is planned for 2012 to continue to monitor the groundwater quality at the site. Alyce Hughey
11/21/2012 Document, Report, or Work plan Review - other Reviewed the Annual 2012 Groundwater Monitoring and Sampling Report, dated July 24, 2012, prepared by Conestoga-Rovers & Associates. On May 29, 2012 the two remaining monitoring wells MW-13 and MW-19 were sampled. Depth to groundwater was 44.50 feet below grade in MW-13 and 51.58 feet below grade in MW-19. Benzene was detected at 0.0055 and GRO was detected at 3.0 mg/L in MW-19. MW-13 did not detect GRO or BTEX above the groundwater cleanup levels for the first time since 2008. Annual groundwater monitoring and sampling is planned for 2013 to continue to monitor the groundwater quality at the site. Alyce Hughey
12/10/2013 Document, Report, or Work plan Review - other Reviewed the Annual 2013 Groundwater Monitoring and Sampling Report, dated October 22, 2013, prepared by Conestoga-Rovers and Associates. On May 21, 2013 the two remaining monitoring wells MW-13 and MW-19 were sampled. Depth to groundwater was 45.28 feet below grade in MW-13 and 52.47 feet below grade in MW-19. GRO was detected at 2.5 mg/L in MW-19. MW-13 did not detect GRO or BTEX above the groundwater cleanup levels for the second consecutive sampling event. Annual groundwater monitoring and sampling is planned for 2014 to continue to monitor the groundwater quality at the site. Alyce Hughey
11/6/2014 Institutional Control Update Current project manager chooses to retain management of the site at this time. Kristin Thompson
11/18/2014 Document, Report, or Work plan Review - other Review the Annual 2014 Groundwater Monitoring Report, prepared by Conestoga-Rovers & Associates. Paul Horwath
3/12/2015 Update or Other Action Decimal Lat/Long coordinates collected using ADEC Internal GIS map, and entered into database. 59.778436 -151.832873 Paul Horwath
3/23/2016 Document, Report, or Work plan Review - other Reviewed GHD's March 4, 2016 Annual 2015 Groundwater Monitoring Report. Concentrations in MW-19 exceed GW cleanup level for GRO. Benzene detected at 0.001 mg/L. GW concentrations in MW-13 meet ADEC GW cleanup levels. BTEX has biodegraded over the years to meet ADEC GW cleanup levels. GRO remains the more persistent contaminant of concern. Paul Horwath
9/30/2022 Institutional Control Compliance Review As part of an IC compliance review a site file review was completed and groundwater monitoring results for 2017, 2018, 2019, and 2020 were located but had not been documented in this database record at this point. The monitoring reports will also be uploaded to this record. During these sampling events, groundwater samples were collected for analysis from monitoring wells MW-13 and MW-19. Analytical results from the monitoring wells remain consistent with historical data. Evonne Reese
9/30/2022 Institutional Control Update I verified with the Chevron project manager that the sampling frequency is now every three years so the next sampling event will be in 2023. Evonne Reese
6/7/2023 Institutional Control Update Starting with the 2023 summer groundwater monitoring, the analytical parameters for this site can be reduced to GRO, BTEX, naphthalene, and 1,2,4-trimethylbenzene in both monitoring wells Evonne Reese
10/31/2023 Document, Report, or Work plan Review - other Reviewed the October 2023 Tri-Annual Groundwater Monitoring Report. Analytical results from the monitoring wells are generally consistent with historical data. Naphthalene was detected at concentrations above the Table C groundwater in MW-13 at an estimated concentration of 2.07 µg/L and at MW-19 1.23 µg/L and 2.05 µg/L in BD-1. Naphthalene was the only contaminant detected above the groundwater cleanup levels. The next groundwater sampling event will be in 2026. Evonne Reese
10/31/2023 Institutional Control Compliance Review IC compliance review conducted when reviewing required groundwater monitoring report. The next monitoring event is due in 2026. Evonne Reese

Contaminant Information

Name Level Description Media Comments
Benzene > Human Health/Ingestion/Inhalation Soil
Ethylbenzene > Human Health/Ingestion/Inhalation Soil
Toluene > Human Health/Ingestion/Inhalation Soil
Xylenes (total) > Human Health/Ingestion/Inhalation Soil
GRO > Human Health/Ingestion/Inhalation Soil
GRO Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil
GRO > Table C Groundwater
Benzene > Table C Groundwater

Control Type

Type Details
CS Database Notation And Letter To Landowner/RP Institutional Control consists of a CS database notation that residual soil and groundwater contamination remains at this site, as well as ADEC's August 24, 2000 NFRAP determination letter.

Requirements

Description Details
Groundwater Monitoring Texaco is required to monitor GW on a triennial basis (once every three years) until GW concentrations meet the Table C groundwater cleanup levels. Texaco is required to abandon the monitoring wells upon completion of long-term GW quality monitoring. A report is required to be submitted to ADEC following each GW sampling event.
Excavation / Soil Movement Restrictions Texaco is required to provide a qualified impartial third party to monitor any soil excavation or other work that exposes residual contaminated soil within the Sterling Highway R-O-W. Any transport or disposal of contaminated soil at or from the site requires prior approval from ADEC. A report would be required following either soil excavation or soil transport/disposal as covered under "Details".

No associated sites were found.

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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
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