Division of Spill Prevention and Response

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Site Report: Cook's Corner Tesoro - Sterling


Site Name: Cook's Corner Tesoro - Sterling
Address: 33320 Sterling HighwayMi. 82 Sterling Hwy.;, Sterling, AK 99672
File Number: 2334.26.002
Hazard ID: 23742
Status: Cleanup Complete - Institutional Controls
Staff: Paul Horwath, 9072623422 Paul.Horwath@alaska.gov
Latitude: 60.535359
Longitude: -150.744294
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

Fuel contamination of soil and GW up to 7800 ppb BTEX. This LUST project converted to a State-lead status when the owner refused to comply with State law requiring containment and cleanup response. In 5/89, ADOT&PF notified DEC that soil and GW contamination had been detected at this facility. In 6/89, DEC issued an NOV/Request for Corrective Action to the owners, asking that they take measures to assess their site, and to mitigate any on-going releases. Tank and line tightness testing conducted by the owners in June revealed numerous leaks in the underground fuel line joints and piping connections. Site assessment activities were contracted by ADEC. GW contamination was detected across the Sterling Hwy. on adjacent property. No other potential sources were identified. Based on this assessment data, the DEC again requested that the owners conduct additional assessment and cleanup work at their site. The owners refused, and in 10/89, the DEC again contracted with Shannon & Wilson to perform the required site assessment and cleanup work. The responsible party tool the lead when the State Underground Storage Tank Financial Assistance program became available to UST system owners/operators. Substantial assessment and cleanup work has been conducted at this facility over the years. In 2004, a groundwater treatment system was installed and operated until 2007. Future work at this site long-term groundwater quality monitoring both onsite and offsite.



Action Information

Action Date Action Description DEC Staff
5/17/1989 Underground Storage Tank Site Characterization or Assessment PA; Sterling Highway MP 79-94, Soil Sampling and Monitoring Well Installation, May 17, 1989 by Hart-Crowser. Approximately 7800 ppb of BTEX in one well and 1930 ppb in second well. * Not Assigned
5/17/1989 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77622 ADD; * Not Assigned
5/17/1989 Site Added to Database * Not Assigned
5/18/1989 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; :LCAU Date changed DB conversion * Not Assigned
6/19/1989 Release Investigation SI; Cook's Sterling Tesoro, Mile 82 Sterling Highway Underground Fuel Storage Tanks, June 19, 1989 by Gilfilian Engineering, Inc.: Tank Tightness Testing showed all 4 tanks has leakage @ > 0.1 gallons per hour. A Corrective Action Plan for further pipe joint and tank inspection was recommended. * Not Assigned
6/21/1989 Leaking Underground Storage Tank Corrective Action Underway RAPR; Sterling Tesoro Site Assessment, Storage of Removed Soil, June 21, 1989 by Northern Test Lab, Storage of approx. 50 cubic yards * Not Assigned
8/25/1989 Leaking Underground Storage Tank Corrective Action Underway RAPR; Sterling Tesoro Service Station, Proposed Site Assessment, August, 1989, by Northern Testlab: Seven drinking water wells identified within 500' radius of Cook's Tesoro. Two samples collected and tested but results not available. * Not Assigned
8/25/1989 Underground Storage Tank Site Characterization or Assessment SA1R; SA1R date changed DB conversion 1/11/11 * Not Assigned
11/6/1989 Release Investigation SI; Sterling Highway, MP 79-94, Phase II Borings, November 6, 1989 by Hart Crowser: 4 borings drilled in right of way on Sterling Highway adjacent to the Sterling Tesoro indicated no measurable quantities of BTEX in soils. * Not Assigned
2/13/1991 Long Term Monitoring Established MS; Shannon & Wilson report shows a groundwater sample placed in boring B-4 downgradient from site with BTEX levels at 14820 ppb. No detectable levels were found in the 4 monitoring wells placed south of SW-4 or in the monitoring well positioned adjacent to the treatment cell. * Not Assigned
2/13/1991 Release Investigation RELR; RELR date chnaged DB conversion 1/11/11 * Not Assigned
2/13/1991 Release Investigation SI; Shannon & Wilson report for cleanup & investigation. Estimated removal of 2500 cubic yards of contaminated soils from site to storage cell. Upper limit of contaminant levels was seen in sample S-40: 1900 ppm VPH. Upper limit for benzene 8600 ppb, 7000 ppb toluene, 470 pb ethylbenzene, & 2100 ppb xylenes all in CC8W2. * Not Assigned
4/3/1992 Update or Other Action UPD; Comments narrative updated by Horwath. * Not Assigned
6/2/1993 Update or Other Action CAPR; * Not Assigned
7/31/1993 Leaking Underground Storage Tank Emergency Response SC; On August 2, 1993, an Emergency STAP Cleanup Grant funded site assessment report was received at KDO. The field work was conducted in March, April, and May, 1993. On August 5, 1993, additional site assessment information was received indicating that a private water supply well was found to have low levels of gasoline contamination detected in its water supply. * Not Assigned
6/15/1994 Leaking Underground Storage Tank Corrective Action Underway CAPR; Conditional approval granted. * Not Assigned
12/22/1994 Leaking Underground Storage Tank Corrective Action Underway LCAR; This is an UST STAP site. * Not Assigned
6/8/1995 Site Visit FI; Departmental staff conducted a site inspection to inspect the storage cells for the contaminated soil generated and removed from the Cook's Tesoro LUST site. * Not Assigned
7/20/1995 Update or Other Action CAPR; STAP. Departmental staff reviewed and commented on a draft Corrective action plan to address contaminated soil which was generated and removed from the Cook's Tesoro LUST site. * Not Assigned
8/14/1995 Leaking Underground Storage Tank Corrective Action Underway CAPR; Departmental staff reviewed and commented on a draft amended corrective action plan to address contaminated soil which was generated and removed from the Cook's Tesoro LUST site. * Not Assigned
8/17/1995 Update or Other Action CAPR; Reviewed / responded to an addendum to the WRI/Cooks's corrective action plan. * Not Assigned
11/28/1995 Update or Other Action CAPR; Reviewed/responded to a corrective action plan related to FY96 Storage Tank Assistance Program application. * Not Assigned
5/8/1996 Leaking Underground Storage Tank Corrective Action Underway CAPA; Reviewed and responded to a corrective action plan related to FY94 Storage Tank Assistance Program funding. * Not Assigned
7/31/1996 Update or Other Action UPD; Reviewed/responded to a corrective action plan related to FY96 Storage Tank Assistance Grant Program funding, pertaining to soil stockpile disposal. * Not Assigned
8/5/1996 Update or Other Action UPD; Reviewed/responded to a corrective action plan related to FY96 Storage Tank Assistance Grant Program funding, pertaining to soil sampling plan. * Not Assigned
9/26/1996 Update or Other Action UPD; Reviewed/responded to a corrective action plan related to FY96 Storage Tank Assistance Grant Program funding, pertaining to soil stockpile weighing, sampling and assessment. * Not Assigned
10/2/1996 Update or Other Action UPD; Reviewed/responded to a corrective action plan related to public notice for GW treatment CAP. * Not Assigned
10/9/1996 Update or Other Action UPD; Reviewed/responded to a corrective action plan related to FY96 Storage Tank Assistance Grant Program funding. * Not Assigned
11/4/1996 Update or Other Action UPD; Reviewed/responded a corrective action plan related to FY96 Storage Tank Assistance Grant Program funding. * Not Assigned
11/13/1996 Update or Other Action UPD; Reviewed/responded to a corrective action plan related to FY96 Storage Tank Assistance Grant Program funding. * Not Assigned
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: JOHN COOK * Not Assigned
11/24/1997 Update or Other Action Cleanup grantee; John Cook; None given * Not Assigned
5/21/2002 Update or Other Action Updated GIS information. Accuracy Information (for those who want it): Method: MAP INTERPOLATION - Kenai Peninsula Borough Tax Parcels Map 1999 Scale of Source: approximately 1:24,000 Datum: Nad27 Accuracy: Approx 500 meters (some may be better but I wouldn't claim better accuracy without seeing the physical site files and double-checking to see if the locations were on the correct tax parcel) Cynthia Pring-Ham
1/14/2003 Update or Other Action ADEC funded the installation of two additional GW MWs in December, 2002. First sampling of these wells resulted in non detects. Cook's consultant completed the yearly GW monitoring event for 2002. Also performed a domestic water well drawdown test in the effort to determine if pumping of the domestic well would draw down the water table 35 feet away at MW GE-8. No drawdown was detected after 6 hours of pumping. Paul Horwath
5/15/2004 Update or Other Action ADEC approved a Corrective Action Plan allowing for the installation of a vapor stripping circulation (VSC) groundwater treatment system. Paul Horwath
6/18/2004 Update or Other Action ADEC received a MWH report confirming that the vapor stripping circulation groundwater treatment system installation was complete, and that the system was operational. Paul Horwath
8/5/2004 Update or Other Action File number assigned and entered into the Fileroom DB and LUST DB. Alyce Hughey
11/29/2004 Leaking Underground Storage Tank Corrective Action Underway ADEC issued approval of a corrective action plan which allows for the operation, maintenance, and monitoring of the vapor stripping circulation groundwater treatment system, and annual groundwater quality monitoring at locations both onsite and offsite. Paul Horwath
9/13/2005 Report or Workplan Review - Other ADEC received and reviewed the September 2005 MWH July 2005 Annual Monitoring Event Report. GW concentrations were down in 3 MWs, the same in 2 MWs, and up in 1 MW. One of the injection wells (REC-2) in the air stripping GW recirculation treatment system plugged up. Former vapor stripping circulation well VSC-1 was converted to an injection well (newly named REC-3). The groundwater treatment system has nonfunctional due to power outages. ADEC has requested that an auto-dialer and a run hour meter be installed on the system to notify MWH of system shutdowns and to record the number of hours the system operates. These items are to be installed in September, 2005. Paul Horwath
12/27/2005 Update or Other Action Using Figure 1 from a Drilling and Monitoring Well Installation Report Cook's Service Station, from Kent & Sullivan, dated July 30, 1999, 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
8/3/2006 Site Visit Inspected the site in July 2006, due to reports of a damaged GW MW security casing. Observed that MW KS-3 was exposed due to separation of security casing cover from the security casing. Reported this finding to Asst. A.G. who is in settlement negotiations with the Cook's and their counsel. Paul Horwath
2/9/2007 Exposure Tracking Model Ranking Intitial Ranking Complete for Source Area: 77622 (Autogenerated Action)
8/2/2007 Report or Workplan Review - Other Reviewed the June 2007 SLR Decommissioning of Treatment System and Wells Groundwater Sampling Report. SLR Alaska implemented the decommissioning of the onsite GW treatment system and the decommissioning of 11 off site GW monitoring wells. SLR also sampled 5 remaining GW monitoring wells for purposes of long-term GW quality monitoring. GW quality data were similar to the 2005 GW monitoring data. GW trend is decreasing contaminant concentrations. Paul Horwath
8/3/2007 Exposure Tracking Model Ranking Updated Ranking Complete for Source Area: 77622 (Autogenerated Action)
8/16/2007 Conditional Closure Approved A Record of Decision was issued 8/16/07, conditionally closing this site. Paul Horwath
8/16/2007 Long Term Monitoring Established Long-term GW monitoring established as a condition of closure. Paul Horwath
8/16/2007 Institutional Control Record Established A Notice of Environmental Cleanup and Residual Soil and Groundwater Contamination was filed with the Kenai Land Recorder Office on 8/16/07. Institutional Control is also noted in this ADEC data base via this action entry. Paul Horwath
12/28/2010 Site Characterization Report Approved Reviewed the 2010 Ground Water Monitoring Report prepared by ADEC Term Contractor SLR, dated November 2010. Groundwater samples were collected in May, 2010, and groundwater contamination continues to exceed ADEC GW cleanup levels in MWs SW-4 and G-6. Groundwater quality continues to improve over time. Paul Horwath
12/29/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77622 UST Systems. Paul Horwath
3/23/2012 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 77622 UST Systems. Paul Horwath
11/6/2014 Institutional Control Update Current project manager chooses to retain management of the site at this time. Kristin Brown
3/12/2015 Update or Other Action Decimal Lat/Long coordinates collected using ADEC Internal GIS map, and entered into database. 60.535359 -150.744294 Paul Horwath
1/27/2016 Update or Other Action Attach the Settlement Agreement and Partial Release to this database, as a publicly available document. Paul Horwath
9/15/2016 Update or Other Action At this time, the current project manager chooses to retain management of this site which has institutional controls. IC Unit
9/20/2016 Site Visit Site visit to locate above ground and underground MWs, preparatory to sampling and decommissioning of the wells by an ADEC Term Contractor in October. Paul Horwath
10/7/2016 Report or Workplan Review - Other Approve term contractor AHTNA's work plan to sample and then decommission the remaining GW MWs at this site. Paul Horwath
10/12/2016 Site Visit Site visit to meet term contractor and help search for buried GW MWs. One MW could not be located. Provide direction to Andy (AHTNA) on how to proceed at with two MWs that were damaged or uncovered. Depart site after MW sampling begins. Paul Horwath
10/13/2016 Site Visit Site visit to observe term contractor (AHTNA) decommission the GW MWs. Learn that the one buried well was destroyed by installation of a fiber optics cable in the Sterling Highway ROW. Cease efforts to locate and decommission that buried, damaged MW. Depart after one MW was properly decommissioned. Paul Horwath
10/21/2016 Site Visit Site visit to collect a phone number off a for sale sign on one a property that must be accessed in order to sample and decommission the GW MW. Collect some tape measurements from bench marks based on historical swing tie measurement from the project file/reports. Share information with ADEC term contractor. Notify contractor that two of the MWs are damaged and will not be sampled. Paul Horwath
11/10/2016 Long Term Monitoring Complete The remaining groundwater monitoring wells have all been decommissioned. No further groundwater quality monitoring is required. MWs with good integrity were sampled one final time prior to decommissioning, by ADEC term contractor AHTNA. Paul Horwath
4/26/2017 Update or Other Action Approve the final Invoice from term contractor Ahtna, for the final GW sampling and MW decommissioning work. Paul Horwath

Contaminant Information

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


Control Type

Type Details
CS Database Notation And Letter To Landowner/RP
Notice of Environmental Contamination (Deed Notice)


Requirements

Description Details
Groundwater Monitoring Annual or semi-annual groundwater monitoring to be contracted and paid for by ADEC.
Excavation / Soil Movement Restrictions Residual contaminated soil or groundwater may not be moved or disposed without ADEC approval.
Groundwater Use Restrictions The installation of groundwater wells is prohibited without prior ADEC approval.
New Construction Restrictions Grounwater monitoring well KS-3 shall not be damaged or removed.