| Action Date |
Action |
Description |
DEC Staff |
| 12/4/2012 |
Spill Transferred from Prevention Preparedness and Response Program |
Spill transferred by PERP staff Mark Sielaff. Spill no. 12239925601; spill date = 5/24/11; substance = diesel (home heating oil); quantity = unknown; source = fuel line to above ground heating oil tank. |
Mitzi Read |
| 12/10/2012 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 12/18/2012 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 79372 name: Diesel - Heating Oil AST Fuel Line |
Mitzi Read |
| 1/4/2013 |
Potentially Responsible Party/State Interest Letter |
|
Bill O'Connell |
| 1/4/2013 |
Document, Report, or Work plan Review - other |
Reviewed 2012 Emergency Response Report for 1277 Knapp Drive. The source of contamination was a broken heating oil line near the foundation of the house that resulted in a release of heating oil into the downstairs living space in October, 2012. Response action included the excavation of approximately 15 cubic yards of contaminated soil, which were disposed of a Alaska Soil Recycling. Confirmation soil samples contained DRO up to 10,400 mg/kg, GRO up to 422 mg/kg, and benzene up to 1.24 mg/kg. Soil borings placed around the property did not indicate the presence of contamination. Drinking water samples were collected from the well, which is located downgradient of the source area between the house and Beaver lake and is approximately 65 feet deep. Contaminants were not detected in drinking water samples. A distinct fuel odor was present in the house during a November site visit. Sheen that was noted on the surface of Beaver Lake was biogenic in nature and not associated with this release. Following heavy rains in September 2012, fuel and groundwater seeped into the living space contaminating the wall materials, which will reportedly be replaced. |
Bill O'Connell |
| 4/8/2013 |
Document, Report, or Work plan Review - other |
Reviewed Corrective Action Investigation report submitted by AlasChem Engineering. The report also included a remedial design for installation of a sump pump, with a water treatment system and a subfloor vapor extraction fan. The investigation consisted of drilling 6, ½-inch holes in the slab, inserting perforated groundwater sample probes, and collecting PID readings from the open holes. PID readings ranged from 280 ppmv to 950 ppmv. No analytical samples were collected. The remedial design calls for a sub slab sump with a pump that pumps contaminated water first into a settling tank and then into a granular activated carbon filter. The sub slab vapor extraction fan will be placed into the same opening as the sump, and vented to the exterior of the house. Additionally, the currently operating heat recovery ventilator will be optimized and run continuously to reduce vapor concentrations in the living space. |
Bill O'Connell |
| 5/23/2014 |
Document, Report, or Work plan Review - other |
Reviewed Fuel Oil Spill Status Report for 1227 North Knapp Drive. The report was drafted by the Responsible Party and contains a summary of response actions and remedial efforts to date to address the heating oil contamination below the concrete slab. A combination sump pump/vapor extraction system was installed and is operational. Water removed by the sump pump is filtered through a carbon filter to remove residual hydrocarbons prior to discharge to the ground surface. The french drain around the perimeter of the house was expanded to remove water before it migrates below the slab. PID readings collected from monitoring points through the slab have shown a significant decrease in VOC concentrations since the system was activated and ambient PID readings in the living space have decreased to non-detect levels. It is anticipated that the system will continue to run with winter shutdown likely due to freezing conditions. |
Bill O'Connell |
| 10/23/2014 |
Document, Report, or Work plan Review - other |
Reviewed updated Fuel Oil Spill Status Report for 1277 Knapp Drive. Since the last update in May 2014, the French drain was further rehabilitated in order to limit the amount of water that migrates under the foundation and a drain field was installed. The floor in the lower level of the house was sealed using a waterproof sealant and will be covered by vinyl flooring. PID readings in the vapor extraction piping indicate petroleum vapors are effectively being removed from below the foundation. Ambient PID readings from the interior of the house are 0.0 to 0.1 ppmv. The test holes in the concrete floor were filled in order to seal the floor. |
Bill O'Connell |
| 1/5/2016 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 79372 Diesel - Heating Oil AST Fuel Line. |
Bill O'Connell |
| 3/4/2016 |
Document, Report, or Work plan Review - other |
Reviewed 2015 site update prepared by the responsible party, Ambient PID readings in the living space were all 0. Vent pipe readings from the vapor extraction system were 5.7 ppmv after being turned off for 48 hours |
Bill O'Connell |
| 7/25/2019 |
Update or Other Action |
Site transferred to Project Manager Jamie Grant. |
Jamie Grant |
| 8/8/2019 |
Site Visit |
Site visit to inspect vapor extraction system, sump pump, indoor air exchange system,floor sealant, treatment system (inline sediment/cartridge filter, oil-water separator, GAC treatment unit), two monitoring wells installed between source of contamination and Little Beaver Lake, and surface water observation for sheen. Groundwater samples collected from source area at sump. Discussion with homeowner regarding analytical data needs to make decisions about the property closure status. Return visit planned for indoor air sampling and monitoring wells. |
Jamie Grant |
| 7/18/2022 |
Update or Other Action |
ADEC staff visited the site on this date and sampled the sump pit water and one of the monitoring wells. The monitoring well on the south portion of the site (MW-02) was not sampled due to insufficient recharge. Sampling results revealed DRO and RRO above ADEC groundwater cleanup levels in the sump (4,480 mg/L and 4,150 mg/L, respectively), and RRO above groundwater cleanup levels in MW-01 (1,250 mg/L). Concentrations in the sump had increased since the 2019 sampling event, but water levels were reportedly low at the site. All other VOCs were below ADEC groundwater cleanup levels. The next sampling event should take place in the later fall or early spring to observe potential seasonal fluctuations. |
Naomi Mason |
