| Action Date |
Action |
Description |
DEC Staff |
| 12/16/2008 |
Update or Other Action |
Soil contamination believed to be from overfills to the 30,000 gallon AST were first reported in 1992. Further characterization efforts were conducted in 1994 and 1997. The tank was removed in 1999. Soil from beneath the tank was excavated to the shallow groundwater aquifer approximately 10 feet bgs in 2000, and additional soil was removed in 2001. Three groundwater monitoring wells were installed in 1994. Numerous samples from these wells have not detected contamination above Table C cleanup levels. The onsite drinking water well is located 200 feet up-gradient of the site in a deeper aquifer reportedly 80 feet bgs. Samples of the drinking water well have not detected petroleum contamination. The 2000 and 2001 excavations were not well documented, and some contaminated surface soil downgradient of the tank may remain. Site characterization efforts in the 1990's determined that the downgradient contamination was limited to the upper one foot of soil. This surface soil contamination will naturally attenuate, and is not expected to pose a risk to human health or the environment provided it is properly managed. |
Kim DeRuyter |
| 12/16/2008 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. |
Kim DeRuyter |
| 12/16/2008 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 12/16/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 78638 name: 30,000-Gallon Diesel AST |
Kim DeRuyter |
| 12/23/2008 |
Update or Other Action |
Cleanup Complete with ICs agreement for the Area 1 site, mailed to IHS but may need to be re-sent when the signatory authority for IHS has been identified. |
Kim DeRuyter |
| 11/9/2009 |
Record of Decision |
Record of Decision for Area 1 was signed by IHS representative Paul Geisert on 11/9/09. |
Kim DeRuyter |
| 11/13/2009 |
Cleanup Complete Determination Issued |
Signed ROD was received and recorded today. |
Kim DeRuyter |
| 5/12/2014 |
Update or Other Action |
Project Manager reassigned to update record |
Fred Vreeman |
| 8/7/2015 |
Update or Other Action |
Transfer to Fairbanks 8/7/15 |
Susan Carberry |
| 5/8/2020 |
Update or Other Action |
DEC conducted a teleconference with IHS, BBAHC, and ERM representatives for the site. Discussed summary of site. Additionally, clarified that the Alternative Cleanup Levels (ACLs) from 1998 would no longer apply as regulations have been introduced that are more stringent than these values. DEC will send a formal letter explaining the decision to rescind old cleanup levels and clarifying applications of newer levels as detailed in 18 AAC 75.340 and 345. |
Tim Sharp |
| 7/21/2020 |
Update or Other Action |
Due to numerous regulatory changes, updated toxicological information, and groundwater impacts at the site, the 1998 ACLs previously accepted by DEC have been rescinded. The contaminated sites at Kanakanak Hospital are subject to the “site cleanup rules”, 18 AAC 75.325 – 18 AAC 75.390. Thus, in lieu of the 1998 ACLs, the currently promulgated cleanup levels in 18 AAC 75 apply. For contaminants in soil, the Human Health, Maximum Allowable, and Migration to Groundwater cleanup levels apply, as listed in Tables B1 and B2 of 18 AAC 75.341. For contaminants in groundwater, the Groundwater Cleanup Levels in Table C of 18 AAC 74.345 apply. Sites that were previously categorized as 'Cleanup Complete' or 'Cleanup Complete with Institutional Controls' may be subject to further review. DEC has sent a formal letter to IHS and BBAHC representatives explaining this change. |
Tim Sharp |
| 8/17/2020 |
Document, Report, or Work plan Review - other |
DEC supplied comments for the Site Wide IC Management Plan. The IC MP details the history of each area of concern at the site and the specific ICs in place for each of the closed sites with ICs. Due to the rescission of the 1998 ACLs, DEC requested each AOC be analyzed by IHS to determine if the ICs are still protective of human health and the environment. Other comments call attention to potentially complete pathways to consider, and further monitoring of groundwater at landfarms. |
Tim Sharp |
| 9/21/2020 |
Update or Other Action |
DEC received the Draft Plan to Develop ACLs at Kanakanak Hospital Memo. The RP has chosen to use the hydrocarbon risk calculator to develop new ACLs. The methods listed include using previous data for Toc values, while collecting new samples for EPH/VPH analysis. Conservative values will be used for bulk density, aquifer thickness, and porosity. A list of data gaps involving drill rig mobilization is also included. |
Tim Sharp |
| 10/23/2020 |
Document, Report, or Work plan Review - other |
DEC provided comments for the Draft Plan to Develop ACLs Memo. Comments regarded including figures for sampling locations, methodology clarification, and bringing attention to data gaps that would require a drill rig to close (Area 3 and 7 MAC exceedances). |
Tim Sharp |
| 7/19/2022 |
Site Visit |
DEC performed a site visit for all areas of concern on the Kanakanak Hospital campus. As part of the site visit, IHS, BBAHC, ERM and DEC held a meeting to discuss the proposed next steps at the site to evaluate remaining contamination and potential transfer of property from IHS to BBAHC. |
Tim Sharp |
| 1/3/2023 |
Document, Report, or Work plan Review - other |
DEC reviewed and submitted comments for the Proposed Alternative Cleanup Levels Memo for Kanakanak Hospital. The Memo proposes new alternative cleanup levels (ACLs) intended to be protective of human health, safety, welfare, and the environment for “residential land use” as described in 18 AAC 75.990. ACLs were developed using the Hydrocarbon Risk Calculator (HRC) as allowed under 18 AAC 75.340 (d) – (f). The ACLs were established to reflect fate and transport properties, toxicity characteristics, and potential exposure routes of contaminants at the site. Diesel range organics (DRO), benzene, ethylbenzene, ethylene glycol, naphthalene, tetrachloroethene, 1,2,3-trichlorobenzene, and 1-methylnaphthalene all have new proposed ACLs given the three- and four-phase calculations conducted using new and historical site-specific data. |
Tim Sharp |
| 3/24/2023 |
Document, Report, or Work plan Review - other |
DEC approved the Proposed Preliminary Remediation Goals (PRGs) based on Hydrocarbon Risk Calculator (HRC) Calculations Tech Memo for Kanakanak Hospital in Dillingham. The tech memo proposes new PRGs intended to be protective of human health, safety, welfare, and the environment for “residential land use” as described in 18 AAC 75.990. PRGs were developed using the HRC. The PRGs were established to reflect fate and transport properties, toxicity characteristics, and potential exposure routes of contaminants at the site. Diesel range organics (DRO), benzene, ethylbenzene, ethylene glycol, naphthalene, tetrachloroethene, 1,2,3-trichlorobenzene, and 1-methylnaphthalene all have new proposed PRGs given the three- and four-phase calculations conducted using new and historical site-specific data.
The technical memorandum asserts that the results of the HRC require validation. Upon attaining PRGs in soil at a given area of concern, model validation will be considered complete when measured concentrations in groundwater fall below 18 AAC 75.345(b), Table C groundwater cleanup values in at least two successive sampling events, accounting for seasonal variability. If these values cannot be attained, reassessment of the PRGs may be appropriate to adjust them downwards.
|
Tim Sharp |
| 8/25/2023 |
Document, Report, or Work plan Review - other |
DEC completed a review of the Draft Supplemental Site Investigation Report. The SI Report details soil and groundwater sampling at eight areas of concern (AOCs) at the Indian Health Service (IHS) Kanakanak Hospital Site. These samples are being used to assist in characterizing contamination at the site, and are being evaluated in tandem with the recent preliminary remediation goals (PRGs) identified in the Proposed Preliminary Remediation Goals based on Hydrocarbon Risk Calculator Calculations memorandum, approved by DEC. Future review of previously closed sites is recommended, and a feasibility study will be prepared for evaluation of remediation options. |
Tim Sharp |
