Site Report: Residence - 22133 South C Street HHOT

Site Name:	Residence - 22133 South C Street HHOT
Address:	22133 South C Street, Lots 4A/5A Block 12, Talkeetna Townsite, Talkeetna, AK 99676
File Number:	2258.38.011
Hazard ID:	4361
Status:	Cleanup Complete
Staff:	No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude:	62.323970
Longitude:	-150.114519
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.

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

On 1/29/07 approximately 850 gallons of diesel #1 were released from a 1,000 gallon aboveground home heating oil tank when snow removal activities caused an outflow fitting to crack. Soil and groundwater were contaminated as a result. The release was discovered by the home owner on 2/1/07 because the furnace was not working. The release occurred between two houses (approximately 40 feet apart). Approximately 100 gallons of fuel and 245 cubic yards of contaminated soil were recovered during initial response efforts. Groundwater was encountered during excavation at approximately 10 feet below ground surface and flows towards the west. The Talkeetna and Susitna Rivers are located to the north and west of the site, respectively, but are not close. Residential drinking water well (~20 feet bgs) on site, approximately 36' west (down gradient) of the spill location. The Talkeetna City water well (~160 feet bgs, lat 62.32473, long. -150.11510) is approximately 300' east of the spill location. The Mat-Su Borough Talkeetna Public Works told ADEC that the spill area is outside of 200' radius from the City drinking water well. There is a clay layer at 30' bgs. Soil and GW are below the most stringent cleanup levels as of 9/23/10. ~273 cy of contaminated soil is stockpiled off site in a gravel pit off of Jubilee Drive at 35269 South Hopper Drive (MSB Tax Account 3801B02L007, Hopper Subdivision, Lot 7 Block 2) in Talkeetna. The pile is being landfarmed to remediate it. A liner is under it and a silt fence around it. DRO still above migration to GW cleanup levels but below ingestion/dermal contact cleanup levels in the pile.

Action Information

Action Date	Action	Description	DEC Staff
1/29/2007	Update or Other Action	During the initial response effort in January and February 2007, approximately 245 cubic yards of contaminated soil was excavated and transported to an off-site land farm location on 35269 South Hopper Drive in Talkeetna. The excavation dimensions were 23.5 feet by 29.25 feet by 9.5 feet below ground surface (bgs). Free product was observed seeping out of the soil and trickling into the groundwater 10 feet bgs at the bottom of the excavation. Approximately 100.5 gallons of the free product was recovered from ground water pumping. Six soil samples collected from the excavation sidewalls contained detectable concentrations of contaminants, but below cleanup levels. The exact location the soil samples were collected is unknown. Prior to backfilling with clean fill, an excavation monitoring point (EMP) was placed in the excavation.	Grant Lidren
2/5/2007	Potentially Responsible Party/State Interest Letter	Ms. Young Ha of PERP hand delivered a letter this date to Mr. Bill Stearns indicating the ADEC is assuming him to be the responsible party at this time and the department will cost recover for our expenses. In cluded in the letter was a request for a Cleanup Action Plan within 15 days and an outline of what was expected in the plan.	Bill Petrik
2/9/2007	Update or Other Action	A letter from Young Ha of the PERP this date approved transport of contaminated snow and soil to an offsite storage area for later treatment.	Bill Petrik
3/12/2007	Spill Transferred from Prevention Preparedness and Response Program	Site transferred by PERP staff Young Ha. Spill No. 07239902901; Spill Date = 1/29/07; Substance = Diesel #1; Quantity = ~850 gallons.	Mitzi Read
3/13/2007	Site Added to Database	Site added to the database.	Mitzi Read
3/13/2007	GIS Position Updated	Coordinates entered that were colleced from Young Ha of PERP using a Garmin 76 GPS Unit while on site on 2/6/07.	Mitzi Read
3/16/2007	Exposure Tracking Model Ranking	Initial ranking completed.	Mitzi Read
4/18/2007	Update or Other Action	A letter was sent this date requesting a summary report of work performed to date, a work plan for the installation of three monitoring, and a stockpile remediation plan.	Bill Petrik
6/14/2007	Site Characterization Workplan Approved	Conditionally approved of the Restoration Science & Engineering "Site Characterization Sampling Workplan for Emerald Alaska Jones Spill (ADEC Spill # 09239902901) – Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska" dated June 4, 2007. Conditions include adding a soils sample at the GW interface if it is not the highest PID screening level in the MW borehole; ensure that GRO is added to all soil and GW sampling; ensure that a CSM is complete including a narrative; off site transport of purged sampling water, if above cleanup levels, is pre-approved; a Laboratory Data Review Checklist is included and complete; and that all personnel that work on the project are qualified. A link to an electronic version of the report was reeived on 6/4/07 and a hard copy version was received 6/5/07.	Bill Petrik
7/12/2007	Meeting or Teleconference Held	A meeting was held this date between the CSP project manager, the landowner Dawn Jones, and the responsible party Bill Stearns. During the meeting issues within the Restoration Science & Engineering "Site Characterization Sampling Workplan for Emerald Alaska Jones Spill (ADEC Spill # 09239902901) - Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska" were discussed. During the meeting it was pointed out by Mr. Stearns that the volume of contaminated soil stockpiled was 245 cubic yards not the 2,266 cubic yards as earlier cited.	Bill Petrik
9/17/2007	Interim Removal Action Approved	On 9/17/07, DEC conditionally approved Restoration Science & Engineering's 9/13/07 dated plan "Workplan for Additional Soil Excavation for Jones Spill (ADEC Spill #09239902901) - Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska. The plan proposed to further excavate around sampling location RSE-2 where elevated petroleum levels remain and to inspect the proposed landspread area. Further excavation was planned to begin on 9/18/07.	Rich Sundet
11/27/2007	Update or Other Action	The CSP received a copy of a cc'd letter to Devra Hayes from Pam Post, Department of Law (DOL), dated 11/23/07 indicating that the DOL received a cost recovery check from Alaska Resource Group as a partial payment for the latest bill to the RP related to the cost recovery period of 2/1/07 through 4/30/07. Monies are being collected on a payment plan.	Bill Petrik
9/19/2008	Site Characterization Report Approved	The CSP performed a review of the Restoration Science & Engineering "Site Characterization and Remediation Activities for Jones Spill (ADEC Spill # 09239902901) – Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska" dated and received October 24, 2007. Remedial activities removed all soils above cleanup levels and stockpiled them off site in a treatment cell located on property owned by the responsible party. The latest GW monitoring results indicated DRO levels above the 18 AAC 75.345 Table C Cleanup Levels. A letter from the CSP was sent in response to the review of the report and requested a work plan outlining further GW sampling in the fall of 2008 and spring of 2009 for DRO, GRO and BTEX. A Conceptual Site Model was lacking in the report and requested along with the work plan. A work plan to address the land spreading activities of the contaminated stockpile was also requested. In addition, the CSP requests annual sampling of an on-site drinking water well for VOCs via EPA Method 524.2 until sampling in any of the monitoring wells has ceased.	Bill Petrik
10/12/2009	Site Characterization Workplan Approved	The CSP completed review of the Restoration Science and Engineering (RSE) work plan “Additional Site Assessment Activities for Jones Spill (ADEC Spill# 09239902901) – Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska” dated and received 10/8/09. The work plan calls for sampling 4 GW monitoring wells for laboratory analysis for GRO, DRO, and BTEX and an on-site drinking water well for VOCs. GW levels will be measured and resulting elevations used to calculate groundwater flow direction and gradient. An off-site stockpile will be sampled for GRO, DRO, and BTEX. The work plan also planned to prepare and submit a CSM for the site. At the completion of the project, an electronic copy of the groundwater monitoring and soil sampling report, lab results, and recommendations will be provided. The work plan was approved with the conditions that: a map be provided to the CSP indicating the location of the stockpile, a sketch of the stockpile with approximate dimensions (top, front and side views) and its relationship to local infrastructure including the property boundaries, driveways, physical and natural attributes, and any environmentally sensitive areas nearby (1/4 mile radius); indications if the stockpile is on a liner, covered by a liner, and the physical condition of the liner and cover; duplicate water samples will be taken from a monitoring well most likely not to result in ND laboratory sampling results; submit duplicate samples to the laboratory blind; submit a Laboratory Data Review Checklist for each batch of samples submitted and for each media, and; any off-site transport of contaminated media from the site must be pre-approved by the CSP per 18 AAC 75.325(i).	Bill Petrik
4/30/2010	Site Characterization Report Approved	Reviewed the Restoration Science and Engineering (RSE) report “Additional Site Assessment Activities Letter Report for 2133 South C Street, Talkeetna, Alaska” dated 1/6/10 and received 1/8/10. The report presents the sampling results from the soil stockpile and groundwater monitoring conducted on October 13, 2009. RSE measured the depth to groundwater from the top of each well casing and purged approximately five gallons from each well RSE but was unable to collect water quality parameters due to equipment failure at the time of sampling. GW flow was calculated to be to the west-southwest and water levels roise an average of 2' over the past 2 years. Groundwater samples were collected from monitoring wells RSE-1, RSE-2, RSE-3, and RSE-4 as well as a duplicate of well RSE-2 and submitted for laboratory analysis for GRO and BTEX. A drinking water sample (DW-1) was collected from the private well located on site, which serves the cabin on the southern portion of Lot 5A. The drinking water sample was collected from the tap in the kitchen, as the drinking water well casing was sealed 5.26 feet below the top of casing and not accessible during the time of sampling. The sample was submitted for laboratory analyses of volatile organic compounds (VOC) via EPA method 524.4. All results were ND. RSE field-screened the stockpile in a grid pattern on approximately 10- to 15-foot centers. Soil samples were field-screened for hydrocarbons. Soil samples were collected from the areas exhibiting the highest PID readings. Four soil samples and one blind duplicate sample were collected and submitted for laboratory analysis for GRO, DRO, and BTEX. All soil samples collected exhibited concentrations of DRO above the ADEC Method 2 Migration to GW soil cleanup level of 250 milligrams per kilogram (mg/kg), ranging from 3,530 mg/kg to 4,790 mg/kg. Additionally, three soil samples exhibited concentrations of GRO above ADEC Method 2 Migration to GW soil cleanup levels of 300 mg/kg, ranging from 390 mg/kg to 506 mg/kg. The remaining target analytes except benzene were detected in at least one soil sample but the resulting laboratory analytical values were either below Method 2 cleanup levels or ND. Since the time of sampling, the soils within the stockpile have been mixed and aerated using an excavator. Silt fencing has been added to the entire perimeter of the stockpile/landspread area and the area remains uncovered. Based on the CSP review, a letter was sent to the RP indicating numerous things. The IDW water can be discharged to the ground at the site. Based on the past two episodes of the drinking water well sampling, no further sampling will be required of this well. The CSP requested submittal of a work plan by 6/7/10 for sampling only MW RSE-2 for DRO, including a duplicate; sampling the soil stockpile for GRO, DRO, and BTEX, including a duplicate; and a schedule for tilling and resampling the stockpiled soil.	Bill Petrik
8/19/2010	Document, Report, or Work plan Review - other	Reviewed a copy of the Restoration Science and Engineering "Groundwater and Soil Sampling for 22133 South C Street – Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska, ADEC File No. 2258.38.011" dated and received 8/17/10.	Bill Petrik
8/31/2010	Site Characterization Workplan Approved	In a letter this date, the CSP approved the Restoration Science and Engineering work plan "Groundwater and Soil Sampling for 22133 South C Street – Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska, ADEC File No. 2258.38.011" dated and received 8/17/10. The work plan was in response to requests in the CSP letter dated April 30, 2010 for further soil stockpile and groundwater sampling. The work plan was approved as written.	Bill Petrik
10/22/2010	Update or Other Action	Received a copy of the Restoration Science & Engineering’s (RSE) "2010 Soil and Groundwater Sampling for 22133 South C Street, Talkeetna, Alaska (ADEC File No. 2258.38.011)" dated October 20, 2010.	Bill Petrik
12/14/2010	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 75345 Diesel HHOT.	Bill Petrik
3/29/2011	Site Characterization Report Approved	Reviewed the Restoration Science and Engineering (RSE) "2010 Soil and Groundwater Sampling for 22133 South C Street, Talkeetna, Alaska (ADEC File No. 2258.38.011) for Residence - 22133 South C Street HHOT" dated 10/20/10 and received 10/22/10. The report presents the sampling results from the landfarm soil stockpile and groundwater (GW) monitoring conducted on 9/23/10 by qualified RSE personnel. A GW sample and dup were collected from monitoring well (MW) RSE-2 and analyzed for DRO only. The results were ND with a LOQ of 0.714 mg/l. The prior two sampling events for RSE-2 demonstrated declining or ND laboratory analytical results for GRO and BTEX. A total of 4 soil samples and one blind dup sample were collected from the landfarm in a grid pattern and submitted for DRO, GRO, and BTEX laboratory analysis. DRO was detected in all soil samples and the analytical results varied from 1,570 mg/kg to 3,450 mg/kg, all above the Migration to Groundwater (MTG) cleanup levels but below its direct contact and outdoor air inhalation cleanup levels. There were detections for GRO, ethylbenzene, and total xylenes in the remaining analytical results but none were above their MTG cleanup levels. GRO was detected in all sample results and varied between 16.4 mg/kg to 179 mg/kg. Total xylenes were detected in all samples and varied between 0.503 mg/kg to 4.399 mg/kg. Ethylbenzene was detected in all samples and varied between 0.0239 mg/kg to 0.101 mg/kg. The average concentrations of analytical results from the landfarmed stockpile were less this sampling event than from the previous sampling event. GRO results from this event were not above the MTG cleanup levels, as they were from the previous sampling event. DRO results from this event showed a reduction from an average of 4,114 mg/kg to 2,682 mg/kg. Individual BTEX constituent results were below their respective MTG cleanup levels for the second consecutive time and showed a decrease when comparing the results of the two samplings. The CSP requested a work plan by June 30, 2011 for further sampling and lab analysis for DRO and GRO for the landfarmed stockpile soils in late summer or early fall 2011. It also requested addressing, performing, or implementing, and reporting on inspecting the landfarmed stockpile liner and silt fencing along its perimeter for their integrity and compliance with the criteria outlined in 18 AAC 75.370; periodically “tilling” the landfarmed stockpile to continue to enable it to remediate by natural attenuation per the schedule and methodology as stated in the 8/17/10 RSE work plan; and account for the difference in the landfarm stockpile volumes between those indicated by Emerald and those calculated using the RSE dimensions. The ADEC does not request any further GW sampling for this site as all contaminants of concern are below the MTG cleanup levels and there was a downward trend in detections for at least the last two sampling events. At some point prior to site closure, the ADEC will request that the MWs be properly decommissioned to prevent contamination to the GW.	Bill Petrik
8/5/2011	Site Characterization Workplan Approved	On this date, ADEC received the Landfarm Soil Sampling and Monitoring Well Decomissioning Work Plan submitted by RSE, dated August 5, 2011. The work plan includes: decommissioning of the four MWs; inspection of the landfarm and collecting five soil samples to be analyzed for GRO, DRO, RRO, and BTEX; and evaluate the quantity of soil in the landfarm.	Grant Lidren
10/31/2011	Document, Report, or Work plan Review - other	On this date, ADEC received Landfarm Soil Sampling and Monitoring Well Decommissioning Report submitted by RSE, dated October 27, 2011. Monitoring Wells RSE-1, RSE-2, RSE-3 and EMP were decommissioned. EMP could not be removed; therefore it was decommissioned in place. Monitoring well RSE-4 was not located and was most likely destroyed in 2011 during road improvements. The land farm was found to have an average depth of 1.5 feet and composed of 234 cy of contaminated soil. Seven soil samples collected from the landfarm contained petroleum concentrations below ADEC cleanup levels.	Grant Lidren
8/3/2012	Update or Other Action	On this date, ADEC received photos from land spreading activities. The land farm was spread at the 35269 South Hopper Drive property to a thickness of less than 6 inches. The liner and silt fencing was removed prior to land spreading activities.	Grant Lidren
9/25/2012	Cleanup Complete Determination Issued	The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program, has completed a review of the environmental records associated with the Residence – 22133 South C Street Home Heating Oil Tank (HHOT). Based on the information provided to date and the administrative record, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment. No further remedial action will be required as long as the site is in compliance with established institutional controls.	Grant Lidren
8/7/2015	Update or Other Action	This file has been archived at Alaska Archives Barcode: 896979 Box 413	Susan Carberry

Action Date

Action

Description

DEC Staff

1/29/2007

Update or Other Action

During the initial response effort in January and February 2007, approximately 245 cubic yards of contaminated soil was excavated and transported to an off-site land farm location on 35269 South Hopper Drive in Talkeetna. The excavation dimensions were 23.5 feet by 29.25 feet by 9.5 feet below ground surface (bgs). Free product was observed seeping out of the soil and trickling into the groundwater 10 feet bgs at the bottom of the excavation. Approximately 100.5 gallons of the free product was recovered from ground water pumping. Six soil samples collected from the excavation sidewalls contained detectable concentrations of contaminants, but below cleanup levels. The exact location the soil samples were collected is unknown. Prior to backfilling with clean fill, an excavation monitoring point (EMP) was placed in the excavation.

Grant Lidren

2/5/2007

Potentially Responsible Party/State Interest Letter

Ms. Young Ha of PERP hand delivered a letter this date to Mr. Bill Stearns indicating the ADEC is assuming him to be the responsible party at this time and the department will cost recover for our expenses. In cluded in the letter was a request for a Cleanup Action Plan within 15 days and an outline of what was expected in the plan.

Bill Petrik

2/9/2007

Update or Other Action

A letter from Young Ha of the PERP this date approved transport of contaminated snow and soil to an offsite storage area for later treatment.

Bill Petrik

3/12/2007

Spill Transferred from Prevention Preparedness and Response Program

Site transferred by PERP staff Young Ha. Spill No. 07239902901; Spill Date = 1/29/07; Substance = Diesel #1; Quantity = ~850 gallons.

Mitzi Read

3/13/2007

Site Added to Database

Site added to the database.

Mitzi Read

3/13/2007

GIS Position Updated

Coordinates entered that were colleced from Young Ha of PERP using a Garmin 76 GPS Unit while on site on 2/6/07.

Mitzi Read

3/16/2007

Exposure Tracking Model Ranking

Initial ranking completed.

Mitzi Read

4/18/2007

Update or Other Action

A letter was sent this date requesting a summary report of work performed to date, a work plan for the installation of three monitoring, and a stockpile remediation plan.

Bill Petrik

6/14/2007

Site Characterization Workplan Approved

Conditionally approved of the Restoration Science & Engineering "Site Characterization Sampling Workplan for Emerald Alaska Jones Spill (ADEC Spill # 09239902901) – Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska" dated June 4, 2007. Conditions include adding a soils sample at the GW interface if it is not the highest PID screening level in the MW borehole; ensure that GRO is added to all soil and GW sampling; ensure that a CSM is complete including a narrative; off site transport of purged sampling water, if above cleanup levels, is pre-approved; a Laboratory Data Review Checklist is included and complete; and that all personnel that work on the project are qualified. A link to an electronic version of the report was reeived on 6/4/07 and a hard copy version was received 6/5/07.

Bill Petrik

7/12/2007

Meeting or Teleconference Held

A meeting was held this date between the CSP project manager, the landowner Dawn Jones, and the responsible party Bill Stearns. During the meeting issues within the Restoration Science & Engineering "Site Characterization Sampling Workplan for Emerald Alaska Jones Spill (ADEC Spill # 09239902901) - Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska" were discussed. During the meeting it was pointed out by Mr. Stearns that the volume of contaminated soil stockpiled was 245 cubic yards not the 2,266 cubic yards as earlier cited.

Bill Petrik

9/17/2007

Interim Removal Action Approved

On 9/17/07, DEC conditionally approved Restoration Science & Engineering's 9/13/07 dated plan "Workplan for Additional Soil Excavation for Jones Spill (ADEC Spill #09239902901) - Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska. The plan proposed to further excavate around sampling location RSE-2 where elevated petroleum levels remain and to inspect the proposed landspread area. Further excavation was planned to begin on 9/18/07.

Rich Sundet

11/27/2007

Update or Other Action

The CSP received a copy of a cc'd letter to Devra Hayes from Pam Post, Department of Law (DOL), dated 11/23/07 indicating that the DOL received a cost recovery check from Alaska Resource Group as a partial payment for the latest bill to the RP related to the cost recovery period of 2/1/07 through 4/30/07. Monies are being collected on a payment plan.

Bill Petrik

9/19/2008

Site Characterization Report Approved

The CSP performed a review of the Restoration Science & Engineering "Site Characterization and Remediation Activities for Jones Spill (ADEC Spill # 09239902901) – Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska" dated and received October 24, 2007. Remedial activities removed all soils above cleanup levels and stockpiled them off site in a treatment cell located on property owned by the responsible party. The latest GW monitoring results indicated DRO levels above the 18 AAC 75.345 Table C Cleanup Levels. A letter from the CSP was sent in response to the review of the report and requested a work plan outlining further GW sampling in the fall of 2008 and spring of 2009 for DRO, GRO and BTEX. A Conceptual Site Model was lacking in the report and requested along with the work plan. A work plan to address the land spreading activities of the contaminated stockpile was also requested. In addition, the CSP requests annual sampling of an on-site drinking water well for VOCs via EPA Method 524.2 until sampling in any of the monitoring wells has ceased.

Bill Petrik

10/12/2009

Site Characterization Workplan Approved

The CSP completed review of the Restoration Science and Engineering (RSE) work plan “Additional Site Assessment Activities for Jones Spill (ADEC Spill# 09239902901) – Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska” dated and received 10/8/09. The work plan calls for sampling 4 GW monitoring wells for laboratory analysis for GRO, DRO, and BTEX and an on-site drinking water well for VOCs. GW levels will be measured and resulting elevations used to calculate groundwater flow direction and gradient. An off-site stockpile will be sampled for GRO, DRO, and BTEX. The work plan also planned to prepare and submit a CSM for the site. At the completion of the project, an electronic copy of the groundwater monitoring and soil sampling report, lab results, and recommendations will be provided. The work plan was approved with the conditions that: a map be provided to the CSP indicating the location of the stockpile, a sketch of the stockpile with approximate dimensions (top, front and side views) and its relationship to local infrastructure including the property boundaries, driveways, physical and natural attributes, and any environmentally sensitive areas nearby (1/4 mile radius); indications if the stockpile is on a liner, covered by a liner, and the physical condition of the liner and cover; duplicate water samples will be taken from a monitoring well most likely not to result in ND laboratory sampling results; submit duplicate samples to the laboratory blind; submit a Laboratory Data Review Checklist for each batch of samples submitted and for each media, and; any off-site transport of contaminated media from the site must be pre-approved by the CSP per 18 AAC 75.325(i).

Bill Petrik

4/30/2010

Site Characterization Report Approved

Reviewed the Restoration Science and Engineering (RSE) report “Additional Site Assessment Activities Letter Report for 2133 South C Street, Talkeetna, Alaska” dated 1/6/10 and received 1/8/10. The report presents the sampling results from the soil stockpile and groundwater monitoring conducted on October 13, 2009. RSE measured the depth to groundwater from the top of each well casing and purged approximately five gallons from each well RSE but was unable to collect water quality parameters due to equipment failure at the time of sampling. GW flow was calculated to be to the west-southwest and water levels roise an average of 2' over the past 2 years. Groundwater samples were collected from monitoring wells RSE-1, RSE-2, RSE-3, and RSE-4 as well as a duplicate of well RSE-2 and submitted for laboratory analysis for GRO and BTEX. A drinking water sample (DW-1) was collected from the private well located on site, which serves the cabin on the southern portion of Lot 5A. The drinking water sample was collected from the tap in the kitchen, as the drinking water well casing was sealed 5.26 feet below the top of casing and not accessible during the time of sampling. The sample was submitted for laboratory analyses of volatile organic compounds (VOC) via EPA method 524.4. All results were ND. RSE field-screened the stockpile in a grid pattern on approximately 10- to 15-foot centers. Soil samples were field-screened for hydrocarbons. Soil samples were collected from the areas exhibiting the highest PID readings. Four soil samples and one blind duplicate sample were collected and submitted for laboratory analysis for GRO, DRO, and BTEX. All soil samples collected exhibited concentrations of DRO above the ADEC Method 2 Migration to GW soil cleanup level of 250 milligrams per kilogram (mg/kg), ranging from 3,530 mg/kg to 4,790 mg/kg. Additionally, three soil samples exhibited concentrations of GRO above ADEC Method 2 Migration to GW soil cleanup levels of 300 mg/kg, ranging from 390 mg/kg to 506 mg/kg. The remaining target analytes except benzene were detected in at least one soil sample but the resulting laboratory analytical values were either below Method 2 cleanup levels or ND. Since the time of sampling, the soils within the stockpile have been mixed and aerated using an excavator. Silt fencing has been added to the entire perimeter of the stockpile/landspread area and the area remains uncovered. Based on the CSP review, a letter was sent to the RP indicating numerous things. The IDW water can be discharged to the ground at the site. Based on the past two episodes of the drinking water well sampling, no further sampling will be required of this well. The CSP requested submittal of a work plan by 6/7/10 for sampling only MW RSE-2 for DRO, including a duplicate; sampling the soil stockpile for GRO, DRO, and BTEX, including a duplicate; and a schedule for tilling and resampling the stockpiled soil.

Bill Petrik

8/19/2010

Document, Report, or Work plan Review - other

Reviewed a copy of the Restoration Science and Engineering "Groundwater and Soil Sampling for 22133 South C Street – Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska, ADEC File No. 2258.38.011" dated and received 8/17/10.

Bill Petrik

8/31/2010

Site Characterization Workplan Approved

In a letter this date, the CSP approved the Restoration Science and Engineering work plan "Groundwater and Soil Sampling for 22133 South C Street – Lots 4A and 5A, Block 12, Talkeetna Townsite, Talkeetna, Alaska, ADEC File No. 2258.38.011" dated and received 8/17/10. The work plan was in response to requests in the CSP letter dated April 30, 2010 for further soil stockpile and groundwater sampling. The work plan was approved as written.

Bill Petrik

10/22/2010

Update or Other Action

Received a copy of the Restoration Science & Engineering’s (RSE) "2010 Soil and Groundwater Sampling for 22133 South C Street, Talkeetna, Alaska (ADEC File No. 2258.38.011)" dated October 20, 2010.

Bill Petrik

12/14/2010

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 75345 Diesel HHOT.

Bill Petrik

3/29/2011

Site Characterization Report Approved

Reviewed the Restoration Science and Engineering (RSE) "2010 Soil and Groundwater Sampling for 22133 South C Street, Talkeetna, Alaska (ADEC File No. 2258.38.011) for Residence - 22133 South C Street HHOT" dated 10/20/10 and received 10/22/10. The report presents the sampling results from the landfarm soil stockpile and groundwater (GW) monitoring conducted on 9/23/10 by qualified RSE personnel. A GW sample and dup were collected from monitoring well (MW) RSE-2 and analyzed for DRO only. The results were ND with a LOQ of 0.714 mg/l. The prior two sampling events for RSE-2 demonstrated declining or ND laboratory analytical results for GRO and BTEX. A total of 4 soil samples and one blind dup sample were collected from the landfarm in a grid pattern and submitted for DRO, GRO, and BTEX laboratory analysis. DRO was detected in all soil samples and the analytical results varied from 1,570 mg/kg to 3,450 mg/kg, all above the Migration to Groundwater (MTG) cleanup levels but below its direct contact and outdoor air inhalation cleanup levels. There were detections for GRO, ethylbenzene, and total xylenes in the remaining analytical results but none were above their MTG cleanup levels. GRO was detected in all sample results and varied between 16.4 mg/kg to 179 mg/kg. Total xylenes were detected in all samples and varied between 0.503 mg/kg to 4.399 mg/kg. Ethylbenzene was detected in all samples and varied between 0.0239 mg/kg to 0.101 mg/kg. The average concentrations of analytical results from the landfarmed stockpile were less this sampling event than from the previous sampling event. GRO results from this event were not above the MTG cleanup levels, as they were from the previous sampling event. DRO results from this event showed a reduction from an average of 4,114 mg/kg to 2,682 mg/kg. Individual BTEX constituent results were below their respective MTG cleanup levels for the second consecutive time and showed a decrease when comparing the results of the two samplings. The CSP requested a work plan by June 30, 2011 for further sampling and lab analysis for DRO and GRO for the landfarmed stockpile soils in late summer or early fall 2011. It also requested addressing, performing, or implementing, and reporting on inspecting the landfarmed stockpile liner and silt fencing along its perimeter for their integrity and compliance with the criteria outlined in 18 AAC 75.370; periodically “tilling” the landfarmed stockpile to continue to enable it to remediate by natural attenuation per the schedule and methodology as stated in the 8/17/10 RSE work plan; and account for the difference in the landfarm stockpile volumes between those indicated by Emerald and those calculated using the RSE dimensions. The ADEC does not request any further GW sampling for this site as all contaminants of concern are below the MTG cleanup levels and there was a downward trend in detections for at least the last two sampling events. At some point prior to site closure, the ADEC will request that the MWs be properly decommissioned to prevent contamination to the GW.

Bill Petrik

8/5/2011

Site Characterization Workplan Approved

On this date, ADEC received the Landfarm Soil Sampling and Monitoring Well Decomissioning Work Plan submitted by RSE, dated August 5, 2011. The work plan includes: decommissioning of the four MWs; inspection of the landfarm and collecting five soil samples to be analyzed for GRO, DRO, RRO, and BTEX; and evaluate the quantity of soil in the landfarm.

Grant Lidren

10/31/2011

Document, Report, or Work plan Review - other

On this date, ADEC received Landfarm Soil Sampling and Monitoring Well Decommissioning Report submitted by RSE, dated October 27, 2011. Monitoring Wells RSE-1, RSE-2, RSE-3 and EMP were decommissioned. EMP could not be removed; therefore it was decommissioned in place. Monitoring well RSE-4 was not located and was most likely destroyed in 2011 during road improvements. The land farm was found to have an average depth of 1.5 feet and composed of 234 cy of contaminated soil. Seven soil samples collected from the landfarm contained petroleum concentrations below ADEC cleanup levels.

Grant Lidren

8/3/2012

Update or Other Action

On this date, ADEC received photos from land spreading activities. The land farm was spread at the 35269 South Hopper Drive property to a thickness of less than 6 inches. The liner and silt fencing was removed prior to land spreading activities.

Grant Lidren

9/25/2012

Cleanup Complete Determination Issued

The Alaska Department of Environmental Conservation (ADEC), Contaminated Sites Program, has completed a review of the environmental records associated with the Residence – 22133 South C Street Home Heating Oil Tank (HHOT). Based on the information provided to date and the administrative record, the ADEC has determined that the contaminant concentrations remaining on site do not pose an unacceptable risk to human health or the environment. No further remedial action will be required as long as the site is in compliance with established institutional controls.

Grant Lidren

8/7/2015

Update or Other Action

This file has been archived at Alaska Archives Barcode: 896979 Box 413

Susan Carberry

Contaminant Information

Name	Level Description	Media	Comments
DRO	< Table C	SoilGroundwater

Name

Level Description

Media

Comments

DRO

< Table C

SoilGroundwater

Control Type

Type	Details
No ICs Required

Type

Details

No ICs Required

Requirements

Description	Details
Advance approval required to transport soil or groundwater off-site.

Description

Details

Advance approval required to transport soil or groundwater off-site.

Cleanup Complete

No associated sites were found.

Missing Location Data

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Site Report: Residence - 22133 South C Street HHOT

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

Cleanup Complete

Missing Location Data

State of Alaska Department of Environmental Conservation