| Action Date |
Action |
Description |
DEC Staff |
| 5/15/1993 |
Cleanup Plan Approved |
During an on-site meeting on May 19, 1993 between Jon Clark of the MOA Department of Property and Facility Management (DPFM), Scott Bailey of the ADEC, and Hart Crowser, it was determined that further excavation of soil at the site would be terminated, and that remedial action would be initiated. It was agreed at that time that soil vapor extraction (VES) would be an appropriate technique for this site. A loop of perforated, corrugated, polyethylene piping (trade name ADS) was placed 8' bgs in the excavation within a 2' bed of 3/8" pea gravel prior to backfilling the excavation. A riser pipe was brought to the surface for later attachment to a blower. |
Scott Bailey |
| 5/17/1993 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 78045 ADD; Waste oil and gasoline contamination. |
Former Staff |
| 5/17/1993 |
Site Added to Database |
|
Former Staff |
| 5/18/1993 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
LCAU; |
Former Staff |
| 5/20/1993 |
Site Characterization Workplan Approved |
Received a letter from HartCrowser, dated 5/20/93, indicating that vapor extraction (VE) was intended for future use to address gasoline-impacted soils at the site. HartCrowser proposed to place a loop of VE pipe within the excavation prior to backfilling at ~8' bgs and surround the piping by 1 foot of washed 3/8" pea gravel, completing the excavation with classified sand and gravel backfill. The pipe will be brought to the surface for subsequent attachment to a blower. A report will be provided summarizing the observations during excavation and outline additional work to be performed to delineate the impacted area and remediate the site. Appoved the proposed work. |
Scott Bailey |
| 6/4/1993 |
Update or Other Action |
A Notice of Release Letter was sent to Jon Clark via Certified Mail, Return Receipt Requested this date outlining the tasks to be undertaken and responsibilities for cleaning up the site. |
Scott Bailey |
| 7/2/1993 |
Update or Other Action |
Received copies of the HartCrowser "Final Remedial Action Plan" dated 6/21/93 and "Remedial Investigation / Design Cost Estimate" dated 6/30/93. |
Scott Bailey |
| 1/3/1995 |
Meeting or Teleconference Held |
Met with Jon Clark of the MOA and Nino Muniz of HartCrowser regarding gasoline and diesel tank sites - borings and pilot SVE Proposal. |
Eileen Olson |
| 1/25/1995 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the HartCrowser “UST Site Assessment, Bering Street Maintenance Facility, Anchorage, Alaska” dated July 1993 and received this date. During removal of a 1,500-gallon used oil UST (UST Tank 1403-2) started on 5/15/93, a 3,000-gallon gasoline UST (UST Tank 1403-3) of unknown age, and a 500-gallon UST (UST Tank 1403-4), also of unknown age, were discovered on 5/18/93. Work included removal of the 7-year-old, out-of-service, 1,500-gallon used-oil UST, the gasoline UST of unknown age, and in situ closure of the 500-gallon UST, which contained water from a floor drain within the maintenance building which it was connected to. Removal of the USTs was performed because the used-oil UST had failed a tank tightness test, and the USTs were inactive and not to be put back into service. The 500-gallon UST was not removed due to its depth and location in relation to the building foundation and was abandoned in place with the approval of Scott Bailey by filling it with sand. The two removed USTs were in somewhat deteriorated condition with visible oxidation and some hydrocarbon staining on the outside surfaces. Excavation for the removal of a 1,500-gallon waste oil UST was started on 5/15/93. Field screening with a PID, along with visual and olfactory observations, suggested that the volatile-range release had occurred from the gasoline tank rather than the waste oil UST. Fill material was removed to a depth of 12’.
Excavation soil consisted of brown gravelly sand with some silt (fill), with a silt layer present at 12 feet below grade along the east side of the excavation. Under the gasoline UST, the silt layer did not appear to be present to a depth of 14 feet below grade. No groundwater was encountered in the excavation. The size of the final excavation was rectangular and encompassed a surface area of 1,820 s.f. (70’ by 26’). The excavation was 12 feet deep except directly under the gasoline UST where the depth was 14’.
During excavation 24 field screening samples were collected. All samples were analyzed for BTEX, VPH. Two samples were additionally analyzed for EPH, TPH, and HVO. A laboratory composite sample (TK-1A/TK-1B) was analyzed for PCBs and lead, arsenic, and chromium. Matrix Cleanup Level A concentrations would be appropriate for this site (100 mg/kg EPH (DRO), 50 mg/kg VPH (GRO), 0.1 mg/kg benzene, and 10 mg/kg total BTEX. A number of samples recovered from the excavation contained benzene, total BTEX, and EPH concentrations above the cleanup levels. Soil samples beneath the used-oil UST resulted in 1,200 mg/kg EPH (DRO), and 1,000 mg/kg TPH (RRO). No total benzene, toluene, ethylbenzene, and xylenes (BTEX), benzene, HVOs, and only low concentrations of VPH were detected in the sample. A composite sample contained no PCBs or arsenic and 5.8 mg/kg total lead and 24 mg/kg chromium. Sample EX-EW, collected from the east wall of the excavation, contained no detectable BTEX or VPH. A sample collected from beneath the gasoline UST contained a benzene concentration of 2.7 mg/Kg, a total BTEX concentration of 16.9 mg/kg, and a VPH concentration of 43 mg/kg. Limits of the soil impacts are unknown at this time.
300 to 400 gallons of water emptied from the tank into the excavation and was subsequently removed by Alaska Pollution Control.
Field screening samples were collected from the excavated soils prior to their transport to the Muldoon Maintenance Facility. The soils were stockpiled on a 20-mil HDPE liner and covered with reinforced polyethylene at the end of each day. The stockpile consisted of approximately 600 cubic yards of soil. |
Bill Petrik |
| 9/27/1995 |
Update or Other Action |
Received a copy of the HartCrowser "Work Plan for Additional Groundwater Investigation, Bering Street Maintenance Facility" dated 9/27/95. |
Eileen Olson |
| 9/27/1996 |
Update or Other Action |
Received a copy of the HartCrowser Document "Meeting Discussion December 1995, Addendum to the Corrective Action Plan, Municipality of Anchorage Bering Street Mainternance Facility" dated 9/24/96. The letter summarized the comments and changes made during the meeting on 8/20/96 relating to the December 1995 "Addendum to the Corrective Action Plan (CAP), for the Municipality of Anchorage (MOA) Bering Street Mainternance Facility" attended by Mssrs. Clark and Muniz. |
Lynne Bush |
| 5/1/1997 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the HartCrowser “SVE System Start-Up and System Operation, October 22, 1996 through January 17, 1997, Bering Street Maintenance Facility, Anchorage, Alaska” dated 3/11/97 and received this date. This report presents the work performed and laboratory results related to the installation and operation of a SVE System. The SVE system was installed at the site between 10/1 and 10/22/96 and started 10/22/96. The SVE operated continuously during the quarter except for a period of one day between January 2 and January 3, 1997, and for several hours on January 17, 1997. The system was sampled October 25, and 31; November 7, 14, and 21; December 4 and 20, 1996; and January 3 and 17, 1997.
OVM PID readings generally fell during the quarter starting at a reading of 201 ppmV on October 22, 1996 and ending 0 ppmV by January 3, 1997. The benzene concentration of the exhaust stack gases during the period from October 22, 1996 through January 17, 1997 varied from between 11 ppm at start-up (October 22) to an estimated value of 0.66 ppm on December 4, 1996. No benzene was detected (<0.78 ppm) on November 14 and 21, 1996 and January 3, 1997. GRO ranged from 621 ppm at system start-up to less than the detection limit on January 3, 1997 (<13.3 ppm). For the period from October 22, 1996 through January 17, 1997 average flow rate began at 87 cfm and decreased to 49 cfm by January 17. Using the average GRO concentration and average flow reading for each monitoring period, and utilizing 100 g/mole as the average molecular weight of the discharge, approximately 7.6 gallons (45.5 pounds) of hydrocarbons were recovered during the period.
Based on groundwater elevation measurements, the groundwater level at the site fell approximately 3 feet between October 1995 and October 1996. Groundwater levels declined by about one foot between October 1996 and January 1997. Groundwater in MW-l was sampled for BTEX and DRO on 10/4/96. On 1/17/97, MW-1 contained 0.05’ of measurable floating product and was not sampled. While a sheen has been observed in MW-1 during previous sampling events, measurable free phase liquid hydrocarbons were observed for the first time in January 1997. This is likely due to several factors. Between October 1995 and January 1997, the groundwater level at this well has declined by nearly four feet, with a one foot drop occurring between October 1996 and January 1997. Falling water table conditions can result in an accumulation of free-phase hydrocarbons within a monitoring well. In addition, MW-l is located near the sub-surface SVE recovery loop.
The last GRO sampling was 10/6/95 and resulted in 58 mg/l. The last DRO and BTEX sampling was 10/4/96 and resulted in 2.96 mg/l DRO, 4.24 mg/l benzene, 13.4 mg/l toluene, 1.83 mg/l ethylbenzene, 7.7 mg/l total xylenes, and 27.17 mg/l total BTEX.
|
Bill Petrik |
| 5/28/1997 |
Update or Other Action |
Received the HartCrowser "Monitoring Well Point Replacement" work plan to deepen monitoring wells MWP-1 through 3 and to decommission MWP-4. |
Lynne Bush |
| 11/20/1997 |
Update or Other Action |
ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: MUNICIPALITY OF ANCHORAGE FMD. |
Former Staff |
| 4/20/1998 |
Update or Other Action |
A letter was sent this date to Jon Clark indicating that corrective action is ongoing and to please send progress reports for the department review. |
Lynne Bush |
| 5/29/1998 |
Document, Report, or Work plan Review - other |
Reviewed the HartCrowser "Remediation System Monitoring" dated 5/22/98 received this date. Vapors from the SVE system were sampled in October 1997. Total BTEX and GRO were all ND. The system continued to operate in vacuum mode until February 1998 when the blower was reversed to provide additional oxygen to the subsurface soils. The inside of the maintenance building was monitored for volatile vapors with a PID, especially around any floor drains, sumps, or floor cracks. No PID reading above backgfround was observed. The system is proposed to continue to run in the positive prerssure mode until later in the summer of 1998 when soil samples will be collected to asssess sub-surface hydrocarbon levels.
Since October 1995, data collected from the perimeter wells surrounding the underground storage
tank excavation have shown benzene concentrations no greater than 0.001 mg/l and benzene has not been detected in the perimeter wells in any of the last three sampling events. The highest BTEX concentration observed in 1997 was 0.004 mg/L; no BTEX constituents were detected during the final sampling event of 1997. DRO has generally been observed to be less than 1 mg/L, and, as discussed in various reports, are likely due in part to biogenics, as peat layers were observed during monitoring well installation. The report requested quarterly sampling be reduced to semiannual events with one sampling event to take place in the spring and the second in the fall. |
Bill Petrik |
| 9/25/1998 |
Update or Other Action |
A letter was sent this date to Jon Clark indicating that corrective action is ongoing and to please send progress reports for the department review. |
Lynne Bush |
| 10/20/1998 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the HartCrowser “Groundwater Monitoring, Bering Street Maintenance Facility, ADEC Facility No. 1403; Release No. 93-21-00-137-01; File No. 69.43” dated 7/17/98 and received this date. The report presents the work performed and laboratory results of groundwater sampling related to the operation of a SVE. In February of this year, because volatile vapors were no longer detected in the vapor stream, the SVE unit was reversed to provide oxygen to the subsurface soils. On May 29, 1998, monitoring wells MW-1 through MW-4 were opened and the groundwater elevations measured. Wells MW-2, MW-3, and MW-4 were then purged and sampled and the samples submitted for analyses of GRO, DRO, and BTEX. MW-l was not sampled due to a thick, continuous sheen and strong hydrocarbon odor observed in its purge water. No odor or sheen was observed in the groundwater at the other monitoring wells.
GRO, DRO, and BTEX concentrations were not detected in the monitoring wells sampled, except for a total BTEX concentration of 0.003 mg/l, comprised of 1.0 mg/l ethylbenzene and 1.8 mg/l total xylenes, detected in MW-2.
The groundwater elevation in the monitoring wells MW-1, MW-2, and MW-4 increased by an average of 0.5’ while the elevation in MW-3 decreased by about 0.2 foot. In general, the GW flow direction at the site swings from SE to easterly and appears to be slightly more easterly than observed during the previous three to four events, especially in the vicinity of MW-1 and MW-3. This is likely due to the fact that the air flow had been reversed and groundwater mounding in the vicinity of MW-1 was no longer occurring. The present groundwater flow direction is more consistent with the observed flow direction prior to the startup of the SVE system. The average hydraulic gradient is 0.013 foot/foot, and is generally consistent with previous observations.
As discussed in previous reports, the GW sampling results suggest that significant dissolved hydrocarbon migration through the GW is not occurring at the site. It appears that the primary area of contamination is confined to the fill soils in the vicinity of the former UST excavation. The fine-grained, low hydraulic conductivity soils around the former excavation along with the natural organic content of the soils (peat) appear to be effectively retarding groundwater contaminant migration. |
Bill Petrik |
| 2/3/1999 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the HartCrowser “Groundwater Monitoring, Bering Street Maintenance Facility, ADEC Facility No. 1403; Release No. 93-21-00-137-01; File No. 69.43” dated 11/5/98 and received 2/3/99. On 10/6/98, groundwater elevations in monitoring wells MW-1 through MW-4 were measured. Wells were then purged and sampled and the samples submitted for analyses of GRO, DRO, and BTEX. Concentrations of GRO, DRO, and BTEX were detected in the sample from MW-1. No GRO or benzene was detected in the other monitoring wells. THE maximum concentrations of GRO, DRO, benzene, and Total BTEX were detected in MW-1 at110 mg/l, 16.0 mg/l, 5.7 mg/l, and 53.0 mg/l, respectively, all above site cleanup levels of 2.2 mg/l, 1.5 mg/l, 0.005 mg/l, and 10 mg/l.
The groundwater elevations decreased by an average of 0.9’when compared to the May 1998 levels. In general, the GW flow direction at the site based on this episode of measurement is south-southeasterly with a gradient of 0.025 feet/foot, which is slightly higher but generally consistent with previous observations.
As discussed in previous reports, the GW sampling results suggest that significant dissolved hydrocarbon migration through the GW is not occurring at the site. It appears that the primary area of contamination is confined to the fill soils in the vicinity of the former UST excavation. The fine-grained, low hydraulic conductivity soils around the former excavation along with the natural organic content of the soils (peat) appear to be effectively retarding groundwater contaminant migration. |
Bill Petrik |
| 4/6/1999 |
Update or Other Action |
A letter sent by the department this date, indicating that in a previous monitoring report it was noted that recovery rates are low and a confiimation soil boring plan should be considered for site closure. While a comprehensive sampling plan should be considered to evaluate the current status of the site and system, the sheen on MW-1 and the new information from the recent UST closure may not allow site closure. The Department strongly urges an evaluation of the site so any upgrades or modifications to the system can be made as soon as possible. This may enhance recovery and, potentially, save in overall project costs. |
Lynne Bush |
| 3/2/2001 |
Update or Other Action |
Updated file, see also separate event. |
Lynne Bush |
| 11/12/2002 |
Document, Report, or Work plan Review - other |
Reviewed the HartCrowser sampling results of MWs 2 through 4 on 11/5/02. The only detected contaminant was DRO at 3.88 mg/l in MW-4, which was above the cleanup level of 1.5 mg/l. MW-1 was not sampled. |
Bill Petrik |
| 1/16/2003 |
Update or Other Action |
Letter to Jon Clark asking for work plan to address free product and remaining soil and GW contamination. |
Lynne Bush |
| 2/25/2003 |
Offsite Soil or Groundwater Disposal Approved |
Approved transport of two drums of IDW to ASR. |
Lynne Bush |
| 2/26/2003 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the HartCrowser “Free-Phase Hydrocarbon Assessment, Bering Street Maintenance Facility, ADEC Facility No. 1403; Release No. 93-21-00-137-01; File No. 69.43” dated 2/26/03 received date unknown. The purpose of this assessment was to estimate the lateral extent of free-phase hydrocarbons and to assess groundwater quality southeast of the former USTs at the site. The hydrocarbon assessment included installation, development, and product/water level measurement of three monitoring wells.
On 2/12/03, monitoring wells MW-5, MW-6, and MW-7 were installed to depths of 15 to 15.5 feet bgs. During installation, soil samples were taken at 5-foot intervals for field screening. Field screening results of the borings showed low amounts of organic vapor above the interface. Boring logs for MW-5, and MW-6 indicated hydrocarbon odor was observed at and below12.5’ bgs in MW-5 and at and below10’ bgs in MW-6. Soil samples were silty to sandy in nature. One soil sample was taken from the soil/water interface in each well boring and submitted for laboratory analysis of GRO, DRO, and benzene, toluene, ethylbenzene, and xylenes (BTEX). All three soil samples had benzene levels above the ADEC Cleanup Level of 0.02 mg/kg with the highest value in MW-6 at 7.86 mg/kg. MWs 5 and 6 also exceeded the cleanup level for toluene, the highest level of which was in MW-6 at 34.8 mg/kg. MW-6 also had concentrations of GRO, DRO, and ethylbenzene above ADEC Cleanup Levels at 804 mg/kg, 675 mg/kg, and 15.1 mg/kg, respectively.
On 2/14/03, monitoring well MW-7 was purged and sampled for analysis of BTEX, GRO, and DRO. Analytical results indicated that GRO and BTEX concentrations were ND and their detection limits were below ADEC Cleanup Levels. DRO was detected at 1.2 mg/l which is below its 1.5 mg/l cleanup level. These results indicate that groundwater impacted above ADEC cleanup levels is not migrating off site in the southeast direction. It should be noted, however, that water from MW-4, to the east of the free-phase hydrocarbons, had levels of petroleum hydrocarbons above ADEC Cleanup Levels when sampled in November 2002.
On 2/15/03, GW/product levels were measured in all existing monitoring wells and the three new wells were surveyed into the existing monitoring well network. GW was ~10.5’ bgs in all wells. Interpreted groundwater contours indicate that groundwater is flowing east to southeast with a hydraulic conductivity of 0.0067 ft/ft. Product was present in measurable quantities only in MW-l, where 0.4 feet of product was noted.
Product measurements are scheduled to be performed in March and April to ensure that free-phase hydrocarbons are only present in MW-1. It is additionally recommended that a sampling event to measure GW in all wells where floating product was not detected be conducted in late April.
|
Bill Petrik |
| 5/14/2003 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the HartCrowser “Free-Phase Hydrocarbon Assessment - March-April Groundwater/Product Levels, Bering Street Maintenance Facility, ADEC Facility No. 1403; Release No. 93-21-00-137-01; File No. 69.43” dated 5/14/03 received date unknown. The purpose of these measurements was to determine groundwater flow and location of any floating product on site.
On March 13, 2003, and again on April 17, 2003, groundwater and product levels were measured in all existing monitoring wells using a water/product level indicator. GW was ~10’ bgs in all wells. Interpreted groundwater contours from March indicated that that groundwater was flowing east-southeast, with a hydraulic gradient of 0.004 ft/ft. Interpreted groundwater contours from April show groundwater flowing to the south-southeast, with a hydraulic gradient of 0.01 ft/ft. Free-phase product was present in measurable quantities only in MW-1, where 0.47’ of product was noted in April. Monitoring wells MW-1 and MW-7 were not measured on March 13, 2003, due to the presence of ice on or in the monitoring well casings.
The results of this work indicate that the free-phase petroleum hydrocarbons are very localized in an area immediately around MW-1.
The report recommended actively remediating the area through excavation of contaminated soils immediately around MW-1, pumping of petroleum-contaminated groundwater, the application of Oxygen-Releasing Compound (ORC) prior to backfilling the excavation, and injection of ORC in the area of the former excavation to reduce overall petroleum hydrocarbon levels in the groundwater.
|
Bill Petrik |
| 7/24/2003 |
Update or Other Action |
Site transferred from Bush to Dreyer. |
Amanda Dreyer |
| 10/10/2003 |
Site Characterization Workplan Approved |
After reviewing the HartCrowser "Groundwater Sampling Plan, Bering Street Maintenance Facility, 4333 Bering Street, Anchorage, Alaska; Reckey 93210013701, ADEC File No.: L69.43, Fac ID 1403, Event ID 360" dated 9/19/03, sent a letter this date approving it. |
Amanda Dreyer |
| 10/10/2003 |
Offsite Soil or Groundwater Disposal Approved |
After reviewing the HartCrowser "Contaminated Soil Transport and Disposal Approval; Municipality of Anchorage, Bering Street Maintenance Facility, Anchorage, Alaska" letter request dated 10/2/03, received 10/7/03, to transport and dispose of contaminated soil at Alaska Pollution Control (APC) from this site, sent a letter this date approving the transport. The ADEC requests that the contaminated soil be covered enroute to APC. |
Amanda Dreyer |
| 2/6/2004 |
Update or Other Action |
Received a copy of the HartCrowser “Work Plan for Monitoring Well Installation and Groundwater Sampling, Bering Street Maintenance Facility; ADEC Facility No. 1403; Release No. 93-21-00-137-01; File No. 69.43” dated 2/6/04. |
Closed |
| 4/20/2004 |
Site Characterization Workplan Approved |
Reviewed a copy of the HartCrowser “Soil Excavation and Free-Phase Hydrocarbon Removal, Bering Street Maintenance Facility, ADEC Facility No. 1403; Release No. 93-21-00-137-01; File No. 69.43” dated 12/10/03 received 12/15/03. The purpose of this work was to remove free-phase hydrocarbons from the GW table to accelerate site cleanup.
On 10/16/03, approximately 50 cy of soil were excavated from the area near MW-l and stockpiled on site. Excavation soils consisted of silty sand to sandy silt. MW-1 was removed during excavation activities. The excavation extended to 2’ below the water table or to approximately 14.5’ bgs. GW and free-phase hydrocarbons were allowed to accumulate in the excavation pit and were then pumped into and Alaska Pollution Control (APC) tanker truck. Due to the presence of silty soils, the water in the excavation area pumped dry and was then allowed to recharge. This process was repeated four times. A total of 375 gallons of water/product was pumped from the excavation area.
During initial pumping, a thin layer of free-phase hydrocarbons was c1early observed on the GW. At the final pumping, only sheen was observed on the water. Prior to backfilling of the excavation, three soil samples were collected from 12 feet bgs, within 0.5’ of the water table. Following sampling, 250 pounds of Oxygen Releasing Compound® (ORC) was placed into the groundwater and then mixed with fill material within the GW table to accelerate biodegradation of groundwater contaminants. The excavation was then backfilled, compacted, and paved.
The following day, the stockpile was field screened and soil samples collected to characterize the soils for thermal remediation. All soil samples were submitted for a laboratory for the GRO, DRO, and BTEX analyses. All 3 excavation samples exceeded the 0.02 mg/kg benzene cleanup level at 0.051 mg/kg, 0.243 mg/kg, and 0.076 mg/kg. All 3 stockpile samples exceeded the benzene cleanup level with a maximum value of 2.31 mg/kg. Stockpile sample SP-01 exceeded the cleanup levels for all 6 of the analytes sampled for with the GRO, DRO, and BTEX results in mg/kg as 582, 246, 2.31, 20.1, 8.56, and 36.4. The remaining 2 excavation samples exceeded the benzene cleanup level at 0.385 mg/kg and 0.242 mg/kg.
The report recommended replacing MW-1 to monitor GW quality in its area and sampling the MW network on a semi-annual basis for GRO, DRO, and BTEX. Based on the analytical results of this work completed, the MOA-DMO will arrange for transport of the stockpile to Alaska Soil Recycling for thermal remediation. Sent a letter this date approving of the report and the DEC approves of the proposed site characterization scope as outlined above. Please submit appropriate documentation (brief work plan, brief post monitoring reports) for the reinstallation of MW-1 and groundwater monitoring activities for DEC review and approval prior to implementation.
|
David Pikul |
| 8/30/2004 |
Cleanup Plan Approved |
The ADEC, Contaminated Sites Program, has completed review of the HartCrowser document titled: "Remediation Cell Soil, Muldoon Maintenance Facility, Anchorage, Alaska" dated 7/28/04 and received 7/29/04. Referenced soils were generated in 1993 from the removal of a GRO UST and a used oil UST. In 1993, the soil was transported to the MOA Muldoon Facility and placed into a constructed remedial cell. DEC approves the proposed land spreading activities as outlined in the above referenced document.
Please advise DEC on the proposed schedule for land spreading and provide a written update
following land spreading activities. Include a site figure showing the location of the land spread area, text describing the land spread activities and a description of the environmental setting surrounding land spread area. DEC will evaluate the status of the remediation project following your submittal of 2005 analytical results and DEC review. |
David Pikul |
| 10/15/2004 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the HartCrowser “Monitoring Well Installation and Groundwater Sampling, Bering Street Maintenance Facility; Anchorage, Alaska; ADEC Facility No. 1403; Release No. 93-21-00-137-01; File No. 69.43” dated 7/22/04 received date unknown. The purpose of this work was to replace MW-1 with a new well (MW-1R) to assess whether free-phase hydrocarbons had been removed from this area. In addition, GW sampling was conducted to update GW quality at the site and determine whether the ORC placed in the excavation had any effect on petroleum hydrocarbon concentrations near MW-1R.
On April 26, 2004, a replacement for MW-1 was installed (MW-1R), developed and construction log provided. On April 26 and 27, 2004, GW and product levels were measured in all existing monitoring wells, with the exception of MW-2 and MW-3, using a water/product level indicator. MW-2 could not be sampled due to an ice plug in the well casing. MW-3 could not be accessed due to road maintenance equipment located on the well. Following GW level measurements, wells were purged and samples collected from the monitoring wells MW-1 R, MW-4, MW-5, MW-6, and MW-7 for laboratory analysis for DRO and BTEX. A duplicate sample was collected from MW-7. All analytes were detected in MW-1R but only the cleanup level exceeded was benzene at 0.476 mg/l. All analytes were detected in MW-5 but only the benzene and ethylbenzene cleanup levels were exceeded with values of 3.16 mg/l and 0.707 mg/l, respectively. All analytes were detected in MW-6 and DRO, benzene, toluene, and ethylbenzene cleanup levels were exceeded with values of 3.8 mg/l, 5.43 mg/l and 5.11 mg/l, and 1.09 mg/l, respectively.
No thickness of free-phase hydrocarbons were measured in MW-1 R or any of the other wells measured on April 26 and 27, 2004. Depth to GW varied between ~9.5 to ~10’ bgs.
Contamination above cleanup levels does not appear to be migrating from the former excavation area at this time, as analyte concentrations in down gradient wells MW-4 and MW-7 are well below the cleanup levels. A second round of samples will be collected in fall of 2004 to re-evaluate the levels of the contaminants. These additional samples will assist in consideration of future remedial alternatives for the site.
The CSP sent a letter this date indicating that due to the elevated contaminant concentrations measured, additional monitoring is required. Your consultant, HartCrowser has stated that a second round of groundwater monitoring will be conducted in the fall of 2004. DEC concurs with this monitoring event and will comment further as to the sites regulatory status following review ofthe laboratory data submitted for the fall monitoring event.
|
David Pikul |
| 1/18/2005 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the HartCrowser “Monitoring Well Installation and Groundwater Sampling, Bering Street Maintenance Facility; Anchorage, Alaska; ADEC Facility No. 1403; Release No. 93-21-00-137-01; File No. 69.43” dated 1/14/05 received 1/18/05. The report described the work performed and presented results of the GW and product level measurements performed at the site. GW sampling was conducted to update overall site conditions and to continue to evaluate the effectiveness of free-phase hydrocarbons removal and use of ORC.
On 10/14/04, GW and product levels were measured in all existing monitoring wells. No thicknesses of free-phase hydrocarbons were measured in MW-1R or any of the other wells measured. GW ranged between ~8 and ~10’ bgs. GW flow direction was to the east-southeast with an average hydraulic gradient of 0.03 ft/ft.
Following GW level measurements, wells were purged and GW samples collected from the monitoring wells MW-1R, MW-2, MW-3, MW-4, MW-5, MW-6, and MW-7 for DRO and BTEX laboratory analyses. A duplicate sample was collected from MW-l R (labeled as MW-100). All analytical results for MW2, MW-3, and MW-7 were below cleanup levels. The benzene sample result from MW-1R was above its cleanup level at 0.019 mg/l. The DRO cleanup level was exceeded at 1.57 mg/l in MW-4. The DRO, benzene, and toluene results for MW-5 were above cleanup levels at 1.7 mg/l, 1.1 mg/l, and 1.93 mg/l, respectively. MW-6 sample results exceeded the DRO, benzene, toluene, and ethylbenzene cleanup levels at 3.5 mg/l, 2.05 mg/l, 2.35 mg/l, and 1.09 mg/l, respectively.
The monument and casing of monitoring well MW-3 were found damaged. An attempt made to repair the well on 11/30/04 but the well was found filled with debris and soil.
Pumping the excavation at former MW-1 appears to have been successful at removing free-phase hydrocarbons from the subsurface at the site. ORC placed in the excavation appears to have been effective in reducing petroleum hydrocarbon concentrations. The benzene concentration has declined to below 0.02 mg/l from a level of above of approximately 5 mg/l as measured from 1995 through 1998, and from nearly 0.5 mg/l when sampled in April 2004. Similarly, the sums of the BTEX components and the DRO concentrations have declined.
Results from MW-5 and MW-6 suggest that a significant area of the site remains with elevated petroleum hydrocarbon concentrations in the GW. However, the plume does not appear to be migrating significantly. At a minimum, the site should be monitored semi-annually in 2005. While the contaminant concentrations may continue to attenuate slowly over time, the success of the ORC emplacement in the area near MW-1 R may lead the MOA to consider injection of ORC in the remaining impacted area to increase the rate of petroleum degradation. While the ORC injection would result greater up-front cost, significant savings could be realized over time by reducing number of years of monitoring required at the site.
Monitoring well MW-3 should be properly decommissioned. The measuring point elevation of all remaining monitoring wells should be resurveyed in spring of 2005.
|
Bill Petrik |
| 2/24/2005 |
Update or Other Action |
A call to Guy Harrison, Engineering Technician with the MOA, indicated that the building was on public water. The well appears to not have been used for ~20 years and may or may not still be there. |
Amanda Dreyer |
| 2/25/2005 |
Update or Other Action |
File number issued, 2100.26.246. F.K.A. L69.43 |
Aggie Blandford |
| 5/23/2005 |
Update or Other Action |
Received a copy of the HartCrowser “Work Plan for ORC Injection and Groundwater Sampling, Bering Street Maintenance Facility, Anchorage, Alaska” dated 5/19/05. |
Closed |
| 6/6/2007 |
Update or Other Action |
Site management transferred from Pikul to Petrik. |
Shannon Oelkers |
| 5/19/2008 |
Exposure Tracking Model Ranking |
Initial ranking. |
Grant Lidren |
| 6/2/2008 |
Exposure Tracking Model Ranking |
Intial Ranking Completed |
Grant Lidren |
| 2/5/2010 |
Update or Other Action |
This file was comingled with the information on the 12,000-gallon UST which was located on the same property, removed in 1998, and subsequently closed. This site was still Active so all the information related to the removal of the two 3,000-gallon USTs was removed and assigned file # 2100.26.566 on this date. |
Bill Petrik |
| 2/24/2010 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the HartCrowser “Groundwater Monitoring, Bering Street Maintenance Facility; Anchorage, Alaska; ADEC Facility No. 1403; Release No. 93-21-00-137-01; File No. 69.43” dated 1/10/06 received 1/13/06. The report describes work performed on 9/27/05 and results of GW monitoring at the site.
GW and product levels were measured in all existing monitoring wells using a water/product level indicator. No thicknesses of free-phase hydrocarbons were measured in any of the wells. GW ranged between ~8.5 and ~10’ bgs. GW flow direction was to the southeast.
Following GW level measurements and purging, GW samples were collected from the monitoring wells MW-1R, MW-2, MW-4, MW-5, MW-6, and MW-7 for DRO and BTEX laboratory analyses. A duplicate sample was collected from MW-2 (labeled as 05MW-10-101). Results of analytical samples collected indicated only benzene above its GW cleanup level in MW-5 at 5.76 mg/l. DRO, benzene, and toluene were above their cleanup levels MW-6 at 3.23 mg/l, 5.83 mg/l, and 2.83 mg/l, respectively.
GW parameter readings are generally consistent with areas of contaminants. The DO reading in MW-5 and MW-6 appear to be slightly high considering the ORP readings and the contaminant levels in those wells, however, this may be a remnant of the ORC-A injection in June 2005. In addition, the pH in MW-4, MW-5, and MW-6 were measured at over 9 units. It is uncertain whether this was due to instrument error or other unknown conditions. Further monitoring will determine whether these DO and pH levels are consistent in these wells.
The injection of ORC-A in June 2005 appears to have had an overall positive effect on the site. At one time MW-1R had a benzene concentration of over 7 mg/L and a DRO concentration of over 60 mg/l. All BTEX constituents and DRO concentrations in MW-1R are now below GW cleanup levels. The benzene concentration in MW-5 has declined from over 3 mg/l to around 0.5 mg/l. Similarly, the toluene concentration in MW-5 in excess of the cleanup level in June 2005 is now below that standard. In addition, MW-4, which contained DRO concentrations above the ADEC cleanup level of 1.5 mg/l (3.88 mg/L in November 2002), did not contain detectable petroleum hydrocarbon concentrations at this sampling event. An exception to this trend was the results observed in MW-6 at this sampling event which are generally the same as seen in the last two sampling events.
The report recommended semi-annual monitoring should continue at the site. The plume appears to be generally shrinking, however, the area of the site near MW-5 and MW-6 still contains elevated petroleum hydrocarbon concentrations in the GW. A second injection of ORC-A is recommended to further enhance biodegradation to lower petroleum hydrocarbon concentrations. As an alternative, an injected oxidizer such as RegenOx ™ could be used to be used to physically breakdown the contaminants that could result in a more rapid rate of contaminant degradation.
|
Bill Petrik |
| 2/24/2010 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the HartCrowser “ORC Injection, Groundwater Sampling, and Monitoring Well Decommissioning, Bering Street Maintenance Facility; Anchorage, Alaska; ADEC Facility No. 1403; Release No. 93-21-00-137-01; File No. 69.43” dated 7/21/05 received 7/26/05. The work performed and results of Oxygen Releasing Compound@ (ORC) injection, GW sampling, and monitoring well abandonment activities performed.
On 6/8/05, GW and product levels were measured in all existing monitoring wells using a water/product level indicator. No thicknesses of free-phase hydrocarbons were measured in MW-1R or any of the other wells measured on 6/8/05. GW ranged between ~8.4 and ~10.1’ bgs. GW flow direction was to the southeast with an average hydraulic gradient of 0.03 ft/ft.
Following GW level measurements and purging, GW samples were collected from the monitoring wells MW-1R, MW-2, MW-4, MW-5, MW-6, and MW-7 for DRO and BTEX laboratory analyses. A duplicate sample was collected from MW-6 (labeled as MW-66). Benzene in MW-1R is above the GW cleanup level. Contaminant levels in MWs 2, 2 and 7 are either ND or below cleanup levels. Benzene and toluene levels remain significantly above cleanup levels in MW-5 and MW-6. They are 3.15 mg/l and 4.98 mg/l, respectively, in MW-5 and 5.4 mg/l and 5.11 mg/l, respectively, in MW-6. DRO and ethylbenzene are also above cleanup levels in MW-6 at 3.59 mg/l and 0.75 mg/l, respectively.
An area of approximately 100’ long by 35’ wide in the former UST excavation area was delineated for ORC injection. Asphalt was cored on a grid system and ORC was injected into the groundwater and subsurface soil at 40 locations to provide supplemental oxygen to petroleum-hydrocarbon-reducing bacteria in the subsurface. A Geoprobe® was used to inject an ORC-Advanced slurry (approximately 4 pounds per hole) into the subsurface (between 12 and 8 feet bgs) at a pressure of 1,000 psi, which forced the ORC into the surrounding substrate. Injections continued on June 9. Each hole was then backfilled with bentonite hydrated in place, and the asphalt patched. On June 10, 2005, the patches were all scraped level with grade.
Readings of dissolved oxygen (DO), oxidation-reduction potential (ORP), pH, conductivity, and temperature were made at each sampling point for well stabilization data and for comparison to future monitoring data. The ORP readings in all wells and the dissolved DO reading in MW-1 R, MW-2, and MW-4 are within levels expected for an area with dissolved phase petroleum hydrocarbon impacts. The DO readings in MW-5, MW-6, and MW-7 appear to be unusually high considering the ORP readings and the contaminant levels in those wells. Further monitoring will determine whether these DO levels are consistent in these wells.
MW- 3 was decommissioned on 6/9/05. The well monument was removed, the casing pulled from the ground, and the hole backfilled with bentonite chips hydrated in place. The surface was then sealed with an asphalt patch.
GW sampling results from MW-5 and MW-6 for 2004 and June 2005 suggest that a significant area of the site containing elevated petroleum hydrocarbon concentrations in the GW remains; however, the plume does not appear to be migrating significantly.
|
Bill Petrik |
| 2/24/2010 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78045 3,000-Gallon Gasoline, 1,500-Gallon Used Oil and 500-Gallon USTs. |
Bill Petrik |
| 5/19/2010 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the Shannon & Wilson, Inc. "Work Plan for 2010 Groundwater Monitoring, Bering Street Maintenance Facility, 4333 Bering Street, Anchorage, Alaska; ADEC File No. 2100.26.566 and 2100.26.246" dated 5/3/10 and received 5/6/10. |
Bill Petrik |
| 6/29/2010 |
Site Characterization Workplan Approved |
The CSP reviewed the Shannon & Wilson, Inc. "Work Plan for 2010 Groundwater Monitoring, Bering Street Maintenance Facility, 4333 Bering Street, Anchorage, Alaska; ADEC File No. 2100.26.566 and 2100.26.246" dated 5/3/10. The work plan calls for GW elevation measurement in all MWs on site and sampling from most of the MWs. Sampling analytes will include BTEX for all sampled wells, GRO for the MWs related to the 12,000-gallon gasoline UST, and DRO and naphthalene for the MWs related to the removed 1,500-gallon waste oil and 3,000-gallon gasoline USTs, and a closed in-place 500-gallon UST. The work plan was approved on the conditions that naphthalene be added to the sampling, the naphthalene and blind duplicate samples come from MW-6, and a conceptual site model is completed and added to the report of findings. |
Bill Petrik |
| 1/6/2011 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78045 3,000-Gallon Gasoline, 1,500-Gallon Used Oil and 500-Gallon USTs. The Score remained at 4 despite the Vapor Intrusion Exposure Category changing from Low to High Potential. Benzene in GW is at 4.94 mg/l from the latest sampling. |
Bill Petrik |
| 1/21/2011 |
Site Characterization Report Approved |
Reviewed the S&W "Well Decommissioning and Groundwater Monitoring, Bering Street Maintenance Facility, 4333 Bering Street, Anchorage, Alaska" dated October 2010, received 10/26/10. GW was approximately 10-11' bgs at sampling time and moving southeast. GW sampling for GRO, DRO, BTEX, and naphthalene had these cleanup levels exceedances: benzene in MWs 1R, 2, 5 and 6 from 0.00511 to 4.94 mg/l; GRO in MWs 5 and 6 at 4.22 and 28.3 mg/l; DRO in MWs 5, 6 and 7 from 2.35 to 6.57 mg/l; toluene and ethylbenzene in MW-6 at 4.58 and 1.2 mg/l, respectively. DRO contamination at MW-6 is at the highest levels since sampling of this well started in 2004. The benzene and ethylbenzene levels exceeded the vapor intrusion GW target levels for commercial use of 0.069 mg/l and 0.35 mg/l, respectively. Sent a letter this date requesting a work plan to conduct further GW monitoring, evaluate the indoor vapor intrusion pathway including a building survey of the existing building on site, and address determining the source contributing to continued high levels of contamination detected in groundwater monitoring wells at AOC2 and mitigating it. |
Bill Petrik |
| 4/11/2011 |
Document, Report, or Work plan Review - other |
Reviewed the Shannon & Wilson, Inc. "Work Plan for Additional Site Characterization and Indoor Vapor Intrusion Evaluation, Bering Street Maintenance Facility, 4333 Bering Street, Anchorage, Alaska; ADEC File No. 2100.26.566 and 2100.26.246" dated 3/28/11 and received 4/5/11. |
Bill Petrik |
| 4/26/2011 |
Site Characterization Workplan Approved |
Sent a letter this date conditionally approving the Shannon & Wilson, Inc. "Work Plan for Additional Site Characterization and Indoor Vapor Intrusion Evaluation, Bering Street Maintenance Facility, 4333 Bering Street, Anchorage, Alaska; ADEC File No. 2100.26.566 and 2100.26.246" dated 3/28/11. The work plan calls for tasks at two unique releases at the site designated as AOC1 (file 2100.26.246) and AOC2 (file 2100.26.566). Monitoring Well MW-2 at AOC1 is to be decommissioned and a replacement monitoring well, MW-2R, installed about 5 feet further east and boring soils sampled. GW samples will be collected from the nine monitoring wells at AOC1 and AOC2 and their water levels measured as well. Task 2, Indoor Vapor Intrusion Evaluation related to AOC2, was eliminated from the work plan. This task will be performed at a later time and a work plan submitted for it based on the results of this approved plan. The source of GW contamination observed at AOC2 will be evaluated by investigating other potential on-site sources within and around the existing building by performing an ADEC Building Inventory and Indoor Air Sampling Questionnaire and a floor drain system assessment. |
Bill Petrik |
| 9/12/2011 |
Update or Other Action |
Shortened site name from "MOA - Bering Street Maintenance Facility 3,000-Gallon Gasoline, 1,500-Gallon Used Oil and 500-Gallon USTs" to "MOA - Bering St Maintenance Facility 3,000-Gal Gasoline, 1,500-Gal Used Oil and 500-Gal USTs". |
Janice Wiegers |
| 2/27/2012 |
Update or Other Action |
GW samples have been collected at site in the spring of 2011. The work has been put on hold do to a cracked sewer line. Work will continue in the spring of 2012. |
Katrina Chambon |
| 3/5/2012 |
Offsite Soil or Groundwater Disposal Approved |
CSP approved Shannon & Wilson request to remove 55-gallon drum containing development and purge water from 4333 Bering Street Anchorage, AK to Emerald Alaska. This email approval is for the water only. CSP requests an alternative plan for the soils containing metals above ADEC site clean-up levels.
Soil from AOC1 is not approved to spread on site, soil may contain metal concentrations above ADEC site cleanup levels.
|
Katrina Chambon |
| 3/22/2012 |
Offsite Soil or Groundwater Disposal Approved |
Shannon & Wilson (S&W) requested that the waste soil from AOC3 be transported to the Columbia Ridge Landfill located in Arlington, OR, via Emerald Alaska, Inc. CSP approved the request for contaminated soil transport and treatment was approved March 22, 2012. S&W will be sampling the waste soil from Area of concern 2 for metals. If metals are detected in soil, S&W will have an alternative plan for disposing the soil. |
Katrina Chambon |
| 3/29/2012 |
Document, Report, or Work plan Review - other |
CSP reviewed Request to Transport Impacted Soil and Groundwater, 4333 Bering Street, Anchorage, Alaska; ADEC File NO. 2100.26.246 and 2100.26.566 dated February 29, 2012. The report documents that Shannon & Wilson (S&W) installed replacement well monitoring well (MW) MW-2 at your MOA - Bering Street Maintenance Facility 12,000-Gallon Gasoline UST (CSP file number 2100.26.246), hereinafter referred to as area of concern 1 (AOC1). Groundwater sampling was performed at AOC1 and the MOA - Bering St Maintenance Facility 3,000-Gal Gasoline, 1,500-Gal Used Oil and 500-Gal USTs (CSP file number 2100.26.566), hereinafter referred to as area of concern 2 (AOC2), contaminated sites.
S&W performed a hydrostatic test on the pit in the Paint Shop to assess whether drain piping could potentially leak fluids to underlying soils. The hydrostatic test revealed that the pit’s drain piping was not connected to the Anchorage Water and Wastewater Utility sanitary sewer system. While the location of the release was at the Paint Shop and on the same property of the two other former releases identified as AOC1 and AOC2, the drain piping release is a different source. Therefore, we have named this particular release within our database as MOA - 4333 Bering Street Paint Shop with a file number of 2100.38.528, and hereinafter referred to area of conern 3 (AOC3).
S&W reported that the soil from the AOC3 excavation was visually impacted with petroleum hydrocarbons and was, therefore, containerized. S&W had the soil analyzed for gasoline range orgainics (GRO), diesel range organics (DRO), residual range organics (RRO), volatile organice compounds (VOCs),polychlorinated biphenyls (PCBs) and Resource Conservation and Recovery Act (RCRA) metals. The soil samples contained concentrations up to 16,000 mg/kg of DRO, 18,600 mg/kg of RRO, 11.4 mg/kg of arsenic, 18.6 mg/kg of cadmium, 42.9 mg/kg of chromium, 516 mg/ of lead and 1.5 mg/kg of mercury, all are above DEC 18 AAC 75.341 cleanup levels. Because of the elevated mercury and lead total concentrations, TCLP analysis was run to determine whether the waste was a RCRA hazardous waste exhibiting the toxicity characteristic. Both samples were well under their RCRA TCLP threshold levels (mercury was non-detect, at < 0.00124 mg/L laboratory reporting limit, and lead at 0.22 mg/L). Groundwater samples at AOC2 showed GRO, DRO, benzene, toluene and ethylbenzene above their 18 AAC 75.345 cleanup levels. |
Katrina Chambon |
| 11/8/2013 |
Site Characterization Report Approved |
CSP reviewed Additional Site Characterization Bering Street Maintenance Facility 4333 Bering Street,Anchorage, AK dated October 2013. Groundwater in AOC2 continue to show GRO, DRO, benzene, toluene and ethylbenzene above their 18 AAC 75.345 cleanup levels. The maximum concentration for GRO was 24.8 mg/L, DRO was 6.34 mg/L, benzene was 4.34 mg/L, toluene was 4.35, and ethylbenzene was 0.901 mg/L.
CSP requests that biannual groundwater sampling occur in the Area of Concern 2 (AOC), excluding MW-4. Please provide a brief work plan including schedule by December 31, 2013. If for some reason you are unable to meet this deadline please contact me as soon as possible. CSP suggest samples be collected in the winter and summer in order to establish a trend.
|
Katrina Chambon |
| 6/16/2015 |
Site Characterization Report Approved |
Reviewed the March 2015 Bering Street Maintenance Facility report. There were six groundwater monitoring wells (MW-1R, MW-2, MW-4, MW-5, MW-6, and MW-7) at the site, identified in the report at Area of Concern (AOC)2. In the June 2014 event MW-1R, MW-2, MW6, and MW-7 were sampled and analyzed for DRO, GRO, and BTEX. During the June 2014 sampling event the sample collected from MW-6 exceeded groundwater cleanup levels for DRO, GRO, and benzene at concentrations of 2.73 mg/L, 7.28 mg/L, and 2.07 mg/L, respectively. The sample collected in MW-7 exceeded groundwater cleanup levels for DRO at 1.65 mg/L. During the December 2014 sampling event, the sample collected from MW-6 exceeded groundwater cleanup levels for GRO and benzene at 4.40 mg/L and 0.502 mg/L, respectively. The sample collected from MW-7 exceeded groundwater cleanup levels for DRO at 2.96 mg/L. |
Lisa Krebs-Barsis |
| 7/20/2015 |
Site Characterization Workplan Approved |
Approved of work plan to repair AOC2 wells MW-4, MW-5, and MW-7 and collect groundwater samples from MW-1R, MW-2, MW-5, MW-6, MW-7. Groundwater samples will be analyzed for DRO, GRO, and BTEX. Wells will also be re-surveyed and flow direction will be calculated. |
Lisa Krebs-Barsis |
| 12/21/2015 |
Site Characterization Report Approved |
AOC2 wells (MW5,MW1R, MW2, MW4, MW6, and MW7) were sampled. Samples collected from MW5 and MW6 exceeded cleanup levels for GRO, Benzene, and Toluene. MW7 exceeded cleanup levels for DRO. |
Lisa Krebs-Barsis |
| 2/26/2018 |
Site Characterization Workplan Approved |
The Alaska Department of Environmental Conservation (ADEC) has reviewed the “Workplan for Groundwater Monitoring, Bering Street Maintenance Facility, 4333 Bering Street Anchorage Alaska…”. The work plan details the methods to be followed for the 2018 groundwater monitoring event of wells MW-5, MW-6, and MW-7, for ADEC site numbers 2100.26.566, 2100.38.528 and 2100.26.246 (CCIC). The ADEC has no objections to the work plan. |
Chelsy Passmore |
| 6/14/2018 |
Site Characterization Report Approved |
The ADEC Reviewed the "March 2018 Groundwater Monitoring Event, Bering Street Maintenance Facility..." Report. This report encompasses 3 areas of concern (AOCs) are tracked separately on the database under file numbers 2100.26.246 (CC-IC), 2100.26.566 (This site), and 2100.38.528 (active).This site is described in the report as AOC 2 During March 2018 four groundwater monitoring samples were collected from MW-5, MW-6 and MW-7. MW-5 and MW-6 contained GRO above Table C cleanup levels, which ranged from 5960 ug/L to 9630 ug/L, as well as Benzene up to 1100 ug/L, Toluene up to 1100 ug/l, Ethylbenzene up to 555 ug/L, and Xylenes up to 2310 ug/L. MW-7 contained RRO at 2500 ug/L, above ADEC Table C cleanup levels. |
Chelsy Passmore |
| 6/25/2018 |
Update or Other Action |
Letter sent to MOA requesting additional groundwater monitoring and a vapor intrusion evaluation. A work plan was requested by March 1, 2019. |
Janice Wiegers |
| 8/7/2019 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78045 3,000-Gallon Gasoline, 1,500-Gallon Used Oil and 500-Gallon USTs. |
Chelsy Passmore |
| 10/15/2020 |
Update or Other Action |
DEC sent letter to MOA asking about the work plan requested earlier. |
Janice Wiegers |
