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Site Report: Bekins Northwest

Site Name: Bekins Northwest
Address: 299 West 64th Avenue, Anchorage, AK 99518
File Number: 2100.26.128
Hazard ID: 24057
Status: Cleanup Complete - Institutional Controls
Staff: IC Unit, 9074655229 dec.icunit@alaska.gov
Latitude: 61.162960
Longitude: -149.885020
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.

Problems/Comments

Removal of a 2,000-gallon regulated unleaded gasoline underground storage tank (UST) in 1990 resulted in petroleum hydrocarbon contaminated soil and groundwater impacts as well. Three monitoring wells installed in 1991 identified groundwater contamination. In 1992, 220 cubic yards of contaminated soil was excavated and treated. Additional release investigation work was conducted in 2008, 2009, and 2011 to help define the extent of the remaining soil and groundwater contamination. In February 2011, 261 tons of contaminated soil was excavated and thermally treated. In November 2011, three new monitoring wells were installed including one to the south across West 64th Avenue. Soil contamination above migration to groundwater cleanup levels for gasoline range organics (GRO) and benzene, toluene, ethylbenzene, and xylenes (BTEX) remain at the site. Groundwater ranges between 4 and 6 feet below ground surface. Groundwater flow direction varies from south to southeast. Groundwater contamination moved off property south into the utility corridor and possibly off property across the road. Groundwater contamination above cleanup levels for benzene remains.

Action Information

Action Date Action Description DEC Staff
7/31/1990 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 76710 Gasoline contamination from a 2,000 gallon regulated UST thought to have originated from overfills. Verbal notification given to Dan Austin of ADEC and Dan Diehl of the Anchorage Fire Department given 6/8/90. Former Staff
7/31/1990 Leaking Underground Storage Tank Cleanup Initiated - Petroleum UST removed and samples taken. Petroleum impacted soil was stockpiled on and covered with visquene and the excavation not backfilled. GW sampling results are 2.2 mg/l benzene, 11 mg/l toluene, 1.6 mg/l ethylbenzene, 19.4 mg/kg total xylenes which are all above cleanup levels. GW at 4'. Ron Godden
7/31/1990 Site Added to Database Former Staff
10/29/1990 Site Characterization Report Approved Chempro sends in results from excavation wall soil sampling showing that benzene ranged from 3 ppb to 3,900 ppb and total petroleum hydrocarbons ranged from 18 ppb to 5,700 ppb. Soils to be excavated/stockpiled on site in a suitable soil box with liners and tarp covers. John Halverson
11/16/1990 Update or Other Action Sent letter to Jim Mesceda requesting a site assessment and spill investigation within 20 days of the letter date. Even with frozen soil it's still possible to conduct site assessment work thru installation of soil borings and monitoring wells which will help in developing a corrective action plan as soon as the ground thaws. John Halverson
12/21/1990 Site Characterization Report Approved Bekins Northwest sent CHEMPRO's "Site Assessment / Spill Investigation Report" for the site and it was received this date. Analytical results for TPH using EPA Method 8240 for a sample of pit water had 2.2 mg/L benzene, 11 mg/L toluene, 1.6 mg/L ethylbenzene, and 19.4 mg/L total xylenes. Total petroleum hydrocarbons for soil at the south end of the excavation using EPA Method 418.1 had 5,700 mg/kg. Soil in south end using EPA Method 8240 had 3.9 mg/kg benzene, 240 mg/kg toluene, 200 mg/kg ethylbenzene, and 1,180 mg/kg total xylenes. 50 private wells exist within 1 mile radius of site with the majority being abandoned or unused according to CHEMPRO. John Halverson
1/25/1991 Update or Other Action Sent a second letter to Bekins Northwest requesting submittal of a site assessment plan to define extent and magnitude of soil/groundwater contamination from former tank system because previous submittal is inadequate. Quality Assurance program plan submitted doesn't meet "Interim Requirements for regulated underground storage tanks". John Halverson
2/22/1991 Site Characterization Workplan Approved The CSP reviewed a copy of the RZA Inc. "Scope of Work for Site Assessment; Bekins Northwest Underground Storage Tank; 299 West 64th Street; Anchorage, Alaska" dated 2/20/91 received 2/22/1991 from Chemical Processors, Inc., Seattle WA. Talked to Dan Whitman via telephone and approved the plan this date. John Halverson
3/12/1991 Update or Other Action Initial Site Ranking. John Halverson
7/16/1991 Underground Storage Tank Site Characterization or Assessment The CSP received a copy of the RZA Inc. "Subsurface Petroleum Hydrocarbon Evaluation; Bekins Northwest Underground Storage Tank; 299 West 64th Street; Anchorage, Alaska" dated 6/25/91, prepared for Chemical Processors, Inc., Seattle WA. Three borings were drilled and monitoring wells installed in each. Two soil samples from each boring were submitted for laboratory analysis. There were no detections for GRO or BTEX in any soil samples. The PQL for benzene in soil in these sampling results was 0.05 mg/kg. Groundwater sampling in each of the MWs were ND except for MW-1 that had 0.012 mg/l benzene, 0.005 mg/l toluene, and 0.013 mg/l GRO. The benzene result was above the then cleanup level of 0.005 mg/l. Groundwater was observed at approximately 2' bgs with a flow direction of southeast and gradient of 0.018 feet/foot. Groundwater elevation measurements taken on 4/12/91 indicated a southeasterly flow direction and on 4/16 and 4/19 indicated a south-southeasterly direction. Report recommendations are: more excavation from pit to remove contamination, sample stockpile to determine proper disposal method, after removal of additional soil/groundwater, sample should be taken from MW-1 for analysis to determine if slightly elevated groundwater levels (of contamination) persists. Lateral extent of soil contamination defined by location of MWs 1 through 3 but they are no longer present. John Halverson
9/9/1991 Site Visit Visited site on 8/29/91 and observed that the stockpiled soil was not properly covered and contained. Letter sent this date to the RP indicated the need to properly cover the stockpile and requested a time schedule for corrective action and site cleanup by 10/1/91. Robert Weimer
9/18/1991 Update or Other Action A letter from Burlington Environmental dated 9/19/91 and received 9/26/91 indicated that the contaminated soil stockpile was covered and secured on this date. Robert Weimer
4/20/1992 Update or Other Action Burlington Environmental is planning to do the work in late May, but still needs to get QAPP approved. Additional contaminated soil to be removed, contaminated groundwater, and stockpile on-site. Robert Weimer
9/15/1992 Leaking Underground Storage Tank Corrective Action Underway Reviewed the Burlington Environmental "Corrective Action Plan; Bekins Northwest; Anchorage Facility" dated 8/31/92, received by the department 9/3/92. Talked with Julie Allen and gave verbal approval on the condition that all three MWs must be sampled. Robert Weimer
9/30/1992 Underground Storage Tank Site Characterization or Assessment Reviewed the Burlington Environmental Inc. "Summary Report; Corrective Action Soil and Groundwater Monitoring" dated 6/10/94, received 6/24/94, indicated that for the September 30 and October 1, 1992 Excavation: In mg/kg and compared to the 10/08 cleanup levels, the west excavation sidewall soil sample collected below the GW interface (Sample WESTGWI) was above cleanup levels for benzene and VPH (GRO). The south excavation sidewall soil sample collected below the GW interface (Sample SOUTHGWI) was above cleanup levels for toluene, ethylbenzene, total xylenes, and VPH (GRO). The PQL for benzene was 5 mg/kg which is above the cleanup level and based on other contaminant results assumed to be above its cleanup level. The east excavation sidewall soil sample collected above the GW interface (Sample EASTHI) was above cleanup levels for total xylenes and VPH (GRO) and the PQL for benzene was 0.5 mg/kg which is considerably above the cleanup level and based on other contaminant results assumed to be above its cleanup level. The east excavation sidewall soil sample collected below the GW interface and (Sample EASTGWI) was above cleanup levels for toluene, ethylbenzene, total xylenes, and VPH (GRO) and the PQL for benzene was 5.0 mg/kg which is considerably above the cleanup level and based on other contaminant results assumed to be above its cleanup level. All excavated soils, and the original soils excavated during UST removal, were stockpiled on visquene in the northeast portion of the Bekins property. Two soil stockpile samples were taken on 10/1/92 and submitted to the lab for analysis for TRH, EPH, VPH, BTEX, and HVOs. One was a north stockpile composite sample and the second was the south stockpile composite sample. Lab results indicated that VPH (GRO) and BTEX cleanup levels were exceeded. All HVOs were ND. Benzene detected in one of two samples collected from MW-3 but below cleanup levels and BTEX was not detected in MW-2 or a duplicate sample of MW-3 as a result of September 1993 sampling event. MW-1 was not sampled due to a broken seal and filled with dirt, and abandoned on 10/28/93. The subject report was reviewed on 5/1/09 but listed on this date for site chronology purposes. Bill Petrik
10/12/1992 Document, Report, or Work plan Review - other Review of the Burlington Environmental Inc. "Summary Report; Corrective Action Soil and Groundwater Monitoring" dated 6/10/94, received 6/24/94, indicated that further excavation was performed on 10/12/92 removing 40 cubic yards of soil from the eastern side of the excavation. Excavated materials were added to the existing stockpile. Results for the sample taken above the GW (Sample EASTHI2) was below cleanup levels for BTEX and VPH (GRO). The PQL for benzene was 0.005 mg/kg which is above the cleanup level and based on other contaminant results assumed to be below its cleanup level. Robert Weimer of the CSP gave approval to fill the excavation with clean pit run gravel obtained from Anchorage Sand & Gravel. The subject report was reviewed on 5/1/09 but listed on this date for site chronology purposes. Bill Petrik
9/14/1993 Underground Storage Tank Site Characterization or Assessment Reviewed the HartCrowser “Bekins Northwest Soil and Water Sampling Results” report dated 10/29/93, received 6/29/09 which was Attachment B of the Burlington Environmental Inc. "Summary Report; Corrective Action Soil and Groundwater Monitoring" dated 6/10/94, received 6/24/94. The report indicated that on 9/14/93, 20 soil screening samples were obtained from the 200 cy soil stockpile, located east of the facility. The stockpile size was approximately 80’ x 20’ x 4.5’. Five samples with the highest PID readings (ranging from PID readings of 57 to 953) and a duplicate were submitted for laboratory analysis for VPH (GRO) and BTEX. There were no exceedances of the 10/08 soil cleanup levels. Total xylenes ranged from ND to 43 mg/kg. All the other results were ND except for one sample with 0.01 mg/kg ethylbenzene. The PQL for 2 benzene samples was above the 0.025 mg/kg cleanup level at 0.005 mg/kg but based on other analyte results for those samples did not appear to above the cleanup level. Monitoring wells MW-2 and MW-3 were sampled for BTEX only. All laboratory results were ND except for benzene in MW-3 at 0.0011 mg/l. MW-1 was not sampled due to a broken seal and filled with dirt, and abandoned on 10/28/93. The report was reviewed 6/30/09 but listed on this date for site chronology purposes. Bill Petrik
10/28/1993 Document, Report, or Work plan Review - other Reviewed the HartCrowser “Bekins Northwest Monitoring Well MW-1 Abandonment” report dated 11/18/93, received 6/29/09, that was Attachment C of the Burlington Environmental Inc. "Summary Report; Corrective Action Soil and Groundwater Monitoring" dated 6/10/94. The report indicated that MW-1 was missing a seal and filled with soil. It was filled with bentonite chips to 1.5' of the surface thern filled with 1' of native soil capped by 6" of asphalt. The report was reviewed 6/30/09 but listed on this date for site chronology purposes. Bill Petrik
1/17/1997 Update or Other Action "Requirement to Close an Underground Storage Tank (UST) That Has Been Temporarily Out of Service for More Than 12 Months" notice send to Bekins this date. Ben Thomas
6/22/1998 Document, Report, or Work plan Review - other The program reviewed additional information provided for the site that was received on 2/19/98. A letter was sent this date in response to a review of that site information. Based on a June 1994 Burlington Environmental summary report of site corrective actions, a HartCrowser work plan to undertake further site activities has not been received for departmental review as indicated in a cover letter to the department. Based on the June 1994 summary report a stockpile remains on site. Because the stockpile has been in place longer than the maximum limit of two years, a disposal plan should include sampling the soils under and around the stockpile to determine if migration to soil has occurred. Contamination exists above cleanup levels in soil in the western and southern edge of the excavation and additional investigation and corrective action of the soil and groundwater will be necessary before the department can issue a letter requiring no further action. Lynne Bush
8/26/1998 Site Characterization Workplan Approved A letter was sent this date approving the HartCrowser "Final Work Plan for Stockpile soil, Footprint Soil, and Groundwater Sampling, Bekins Northwest, Anchorage Facility" dated 8/11/98, received by the CSP on 8/24/98, as is, with no modifications. Lynne Bush
12/3/1998 Document, Report, or Work plan Review - other Reviewed the HartCrowser "Report for Stockpile Soil, and Groundwater Sampling" dated 12/3/98, A-8559. The report indicated that approximately 200 cy of contaminated soil was stockpiled on site and sampled in 1993. On 9/4/98, HartCrowser staff met with Bekins staff, determined the area over which stockpiled soils were spread was approximately 88’ by 90’ by 2-3” deep which included the former stockpile location. A grid was established over the area and 20 field screening samples were collected from the top 6” of soil. Five screening samples with the highest readings were submitted for laboratory analysis plus one duplicate. No sample results exceeded the ADEC cleanup Level A. On 9/8/98, five samples were collected from the former stockpile footprint area from 0.5 to 2 feet bgs and submitted for laboratory analysis. None of these sample results exceeded the ADEC cleanup Level A either. The PQL for benzene for all 11 soil sample results ranged above the cleanup level of 0.025 mg/kg from 0.026 mg/kg to 0.031 mg/l, however, the CSP does not believe the results actually exceeded the cleanup level based on the overall evaluation of the GRO and BTEX results. Based on these results and assumption, the CSP concludes that no further action is required regarding the stockpile and resulting landspread soil. Apparent current “stockpiles” that are located at the extreme northeast corner of the site appear to be from sources other than excavated contaminated soils and require no action. Monitoring wells MW-2 and MW-3 could not be located and were assumed to have been destroyed. However, a hydro-punch was driven in the middle of the south edge of the former excavation area, and a GW sample collected. GRO and BTEX results were detected at 130 mg/l, 0.021 mg/l, 3.2 mg/l, 3.0 mg/l, and 26 mg/l, respectively, all exceeding their respective cleanup levels. Report reviewed 6/24/09 but listed on the report date for site chronology purposes. Bill Petrik
12/17/1998 Site Characterization Workplan Approved A letter was sent this date approving the HartCrowser "Addendum to the Work Plan for Stockpile Soil, Footprint Soil, and Groundwater Sampling, Bekins Northwest, Anchorage Facility" dated 9/15/98, received by the CSP on 10/1/98. MWs 2 and 3 could not be found for sampling and were assumed to have been destroyed. The addendum calls for the use of a hydropunch to collect one water sample near the southwest corner of the former UST excavation. Lynne Bush
8/18/2000 Update or Other Action A letter sent this date requested a report of tasks performed in conjunction with the CSP-approved work plan of August 1998. David Allen
10/4/2000 Update or Other Action A letter sent this date requested a report of tasks performed in conjunction with the CSP-approved work plan of August 1998. This is the second request made for the resulting report. David Allen
3/16/2001 Update or Other Action Update Request Letter. A letter sent this date requested a report of tasks performed in conjunction with the CSP-approved work plan of August 1998. This is the third request made for the resulting report. David Allen
12/21/2001 Update or Other Action Site transferred from Bush to Sundet. Lynne Bush
7/17/2006 Update or Other Action Site transferred from Sundet to Petrik. Bill Petrik
7/18/2006 Update or Other Action Latitude and longitude data in decimal degrees and degrees, minutes, and seconds gathered from TopoZone Pro Hi-Res Aerial Photo, Large Size Map, 1:3,333 Scale, No Topo Base Map, NAD 83 in conjunction with the Anchorage Area Atlas and Figure 1, Site Plan from a Burlington Environmental "Summary Report, Corrective Action, Soil and Groundwater Monitoring, Bekins Northwest". dated 6/10/94. High degree of confidence in the accuracy of the site coordinates. Coordinates can only be improved by on-site GPS reading. Legal description added and landowner information updated. Bill Petrik
11/7/2006 Update or Other Action Talked to Nino Muniz of HartCrowser regarding the site status. He was the author of the HartCrowser "Final Work Plan for Stockpile soil, Footprint Soil, and Groundwater Sampling, Bekins Northwest, Anchorage Facility" dated 8/11/98, received by the CSP on 8/24/98 and its "Addendum to the Work Plan" dated 9/15/98, received by the CSP on 10/1/98, both approved as is by the CSP. The work as outlined in these documents was performed in late 1998/early 1999. The resulting report with the results was submitted to Bekins after the work was completed. HartCrowser has not heard back from Bekins since submitting the report to them despite attempts to contact them. Bill Petrik
10/13/2008 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST site created in CSP database for source area Landspread stockpile, 78560 Janice Wiegers
5/13/2009 Document, Report, or Work plan Review - other Reviewed a copy of the HartCrowser "CLIENT REVIEW DRAFT; Soil and Groundwater Assessment; Former Underground Storage Tank; Bekins Northwest, Anchorage, Alaska" dated 9/30/08, 17501-00, received via email on 5/11/2009. See the 5/20/09 "Report or Workplan Review - Other" action for details of the report. Bill Petrik
5/19/2009 Site Visit Went to the site and performed a drive by and walk around the perimeter of the property. Two material piles still exist in the northeast corner of the site. One looks new and appears to be a gravel pile from grading the parking lot or for future use as fill. The other pile appears to be composed of finer dirt and has grass growing on it and is amongst numerous cottonwood trees to ~40' tall and appears to have been there for an unknown numer of years. Unknown whether either pile is contaminated or leftover from the UST excavation. Bill Petrik
5/20/2009 Document, Report, or Work plan Review - other Reviewed a copy of the HartCrowser "Soil and Groundwater Assessment; Former Underground Storage Tank; Bekins Northwest, Anchorage, Alaska" dated 9/30/08, 17501-00, received via email on this date. This is the final version of a "CLIENT REVIEW DRAFT" that was emailed to the CSP on 5/11/09. See the 5/13/09 "Report or Workplan Review - Other" action for details of the report. Work was performed 8/27-29/08. Monitoring wells MW-2 and MW-3 were looked for but not found. 13 push probe borings were completed to 10 feet bgs including contaminant screening, sampling, and continuous soil logging. The upper layer was sandy gravel or gravelly sand with some silt layers present and extended to between 5.5 to 9’ bgs. Below this layer was a gray silt that extended to below the 10’ boring depth. Three borings were finished as monitoring wells MW-4, MW-5, and MW-6. MW-4 was placed within the limits of the former area of excavated soil. Water levels ranged between 3.2 and 4.2’ bgs on 8/29/09 when the MWs were sampled. The GW surface was above the top of the screen for at least one and maybe all 3 MWs. GW flow direction was to the southeast. One soil sample each from 10 of the borings was submitted for lab analysis for GRO, BTEX, and PAHs based on screening results. When compared to the current 18AAC75.341 Table B1 Method 2 cleanup levels the sample from boring B-4, taken from 5.5 to 6.0 feet bgs resulted in a value of 1,020 mg/kg GRO which exceeded the 300 mg/kg cleanup level. The sample results for the boring for MW-4, taken from 6 to 6.5 feet bgs, exceeded the GRO cleanup level at 348 mg/kg, as well as the ethylbenzene cleanup level of 6.9 mg/kg with a result of 17.7 mg/kg, and the total xylenes cleanup level of 63 mg/kg with a result of 100 mg/kg. All the PAH results were ND except for naphthalene which was 4.7 mg/kg and below the cleanup level of 20 mg/kg. A slight sheen was observed in the screened sample taken from 1.5 to 2' bgs from all 13 borings except for B-1. Only GW from MW-4 was sampled and sent to the lab for analysis for GRO, BTEX, and PAHs. When compared to the current 18AAC75.345 Table C groundwater cleanup levels the sample resulted in exceedances of the cleanup levels for GRO and ethylbenzene. The results for these analytes were 24.7 mg/l and 1.29 mg/l, respectively. Their current respective cleanup levels are 1.3 mg/l and 0.7 mg/l. The only PAHs that were detected in the analytical results were acenaphthalene and naphthalene at 0.117 mg/l and 137 mg/l, respectively. These results are substantially below their cleanup levels of 2,000 mg/l and 730 mg/l, respectively. No CSM or Laboratory Data Review Checklist was submitted with the report. Bill Petrik
6/11/2009 Update or Other Action Received a copy of the HartCrowser "Report for Stockpile Soil, Footprint Soil, and Groundwater Sampling" dated 12/3/98 from Shayla Swedlund of Shannon & Wilson, Inc. Bill Petrik
7/14/2009 Update or Other Action The Contaminated Sites Program (CSP) reviewed the Shannon & Wilson, Inc. (S&W) "Revised Limited Phase II Environmental Site Assessment Work Plan, 299 West 64th Avenue, Anchorage, Alaska" dated July 7, 2009 and received 7/8/09 via email. The CSP sent a letter out indicating that it generally has no objection to the work plan and conditionally approved it. The conditions included moving the proposed boring for a monitoring well on the north side of the site further west so that it will be up gradient as opposed to cross-gradient based on available groundwater flow information. The CSP also requested taking soil and groundwater samples from a proposed boring down gradient as that is the boring most likely to have the highest concentrations of contaminants. Static water level on the site has been as shallow as less than two feet below the ground surface. The letter pointed this out and suggested that this point be taken into account when the monitoring wells are installed. Future groundwater sampling that occurs when the static water level is above the screened interval will be evaluated as biased data and potentially deemed unusable. The CSP suggested installing bollards as protection and markers for the monitoring wells as during the course of this site’s existence, numerous monitoring wells have been installed and subsequently lost or destroyed. Disposal of investigation derived waste was approved if sampling results for the related media are below cleanup levels. A Laboratory Data Review Checklist and Conceptual Site Model were also requested as part of a summary report. Further site characterization and investigation may be required pending the outcome of the proposed work. Bill Petrik
8/20/2010 Site Characterization Report Approved The Contaminated Sites Program (CSP) reviewed the Revised Limited Phase II Environmental Site Assessment, 299 West 64th Avenue, Anchorage, Alaska dated November 2009 for the Bekins Northwest site. Soil contamination above the 18 AAC 75.341 Method Two Migration to Groundwater (MTG) cleanup levels and groundwater (GW) above the 18 AAC 75.345 Table C GW cleanup levels remains at the site. The objective of this assessment was to evaluate the extent of the impacted soil and GW south of the UST excavation as part of a progression towards Cleanup Complete with Institutional Controls status with the ADEC. Three borings, B7 through B9, were advanced on July 31, 2009, and completed as monitoring wells (MW) B7MW through B9MW the same day. Soil samples were collected during boring. The wells were developed on August 3, 2009 and sampled after development. Four soil samples plus one duplicate and three GW samples plus one duplicate were sent to a laboratory for GRO and BTEX analyses. The static GW level was measured in the wells and varied from 4.04 feet below the ground surface (bgs) in well B9MW to 5.29 feet bgs in well B7MW. Based on GW elevation data the GW flow direction is to the south at an undetermined gradient. Historic GW flow direction has varied from south to southeast. The analytical results from two soil samples from soil Boring B7, approximately three feet west of the southwest quarter of the former excavation, detected all target analytes in samples from 2.5 to 4.5 feet bgs and 5 to 7 feet bgs. The shallower sample only exceeded the MTG benzene cleanup level at 0.425 mg/kg. The deeper sample, from the zone approximately at to slightly below the water table, exceeded the GRO MTG cleanup level at 986 mg/kg, the benzene MTG cleanup level at 1.82 mg/kg, and the ethyl benzene MTG cleanup level at 7.23 mg/kg. The analytical results from the soil Boring B8, approximately 2.5 feet south of the southern boundary of the former excavation were ND for all analytes except for a very low level of GRO at 4.32 mg/kg. The analytical results from the soil boring from B9, approximately five feet north of the northwest corner of the former excavation, was ND for all analytes. All PQL were below the MTG cleanup levels. One groundwater sample from each MW plus one duplicate from well B8MW were sent for laboratory analysis. The samples from wells B8MW, its duplicate, and B9MW were ND for all analytes. However, the analytical results from the sample from well B7MW exceeded the GW cleanup levels for GRO at 14.5 mg/l and benzene at 0.0272 mg/l. Based on review of these and historic data, the CSP concludes that soil contamination above cleanup levels remains in undisturbed soil west of the area of previously excavated contaminated soil. In a letter from the CSP, requests were made for a work plan for further soil and groundwater characterization or corrective action, and submittal of an updated Conceptual Site Model (CSM). A request for Cleanup Complete with Institutional Controls status with the ADEC was denied based on contaminant concentrations are not decreasing and the groundwater contaminant plume is not in a steady state or shrinking. Bill Petrik
12/15/2010 Document, Report, or Work plan Review - other Reviewed the Shannon & Wilson, Inc. (S&W) "Limited Removal Action Work Plan, 299 West 64th Avenue, Anchorage, Alaska; ADEC File No. 2100.26.128" dated 12/14/10. Corrections and more plans needed prior to approval. Bill Petrik
12/20/2010 Document, Report, or Work plan Review - other Received via email and reviewed the revised Shannon & Wilson, Inc. (S&W) "Limited Removal Action Work Plan, 299 West 64th Avenue, Anchorage, Alaska; ADEC File No. 2100.26.128" dated 12/20/10. Bill Petrik
1/14/2011 Cleanup Plan Approved Sent an email this date approving the revised Shannon & Wilson, Inc. (S&W) "Limited Removal Action Work Plan, 299 West 64th Avenue, Anchorage, Alaska; ADEC File No. 2100.26.128" dated 12/20/10 and received 12/20/10. Bill Petrik
1/14/2011 Offsite Soil or Groundwater Disposal Approved Sent an email to Shannon & Wilson, Inc. with an ADEC/CSP signed and dated "Contaminated Soil Transport and Treatment Approval Form" for contaminated soils to be transported from the site to Alaska Soil Recycling (ASR) with post treatment analysis for GRO, BTEX, and PAHs. Bill Petrik
3/1/2011 Update or Other Action Received an email from Brad Quade of Alaska Soil Recycling (ASR) with an attached Soil Disposal Form. The form indicated that ASR received 261.24 tons of contaminated soil from the site on 2/10 and 2/15/11 for processing as co-mingled soil. Signed and dated it, then emailed it back to Brad at ASR. Bill Petrik
4/20/2011 Update or Other Action Received a copy of the Shannon & Wilson, Inc. "Limited Removal Action, 299 West 64th Avenue, Anchorage, Alaska, ADEC File No. 2100.26.128" dated April 2011. Bill Petrik
5/12/2011 Meeting or Teleconference Held Meeting with RP's consultant (S&W). We discussed that because the extent of the soil and groundwater contamination has not been defined (including to the west and south) and that it has not been demonstrated that the groundwater contamination is stable or shrinking, that DEC will not be able to issue a cleanup complete with IC for this site. We discussed that a minimum of 3 long-term monitoring wells and 4 quarters of groundwater monitoring would be needed. For full closure confirmation soil samples will be needed for the areas identified as remaining above site cleanup levels. We also discussed that contamination may extend off property to the south,which is a Carr Gottstein Warehouse diesel LUST site (2100.26.069) at 6411 C Street. That site was closed on 4/14/2000, and the tank was located on the southern portion of that property. DEC plans it issue a letter requesting a release investigation workplan to define the extent of the remaining soil and groundwater contamination. Robert Weimer
5/12/2011 Site Characterization Report Approved Between February 10-15, 2011, 261 tons of contaminated soil was excavated and transported off site for thermal treatment. The excavation extended to 10 feet below ground surface. This time of year very little groundwater was encountered during the excavation work. 450 pounds of ORC Advanced compound was placed in the bottom of the excavation and blended with the first 1 foot of backfill soil, then the entire excavation was backfilled. Confirmation soil samples collected from the excavation showed up to 1730 mg/kg GRO, 0.678 mg/kg benzene, and 8.21 mg/kg naphthalene remain in the excavation sidewalls collected at 5 to 6 feet below ground surface (bgs), and up to 110 mg/kg GRO and 1.76 mg/kg benzene remain in the base of the excavation collected at 10 feet bgs. During the excavation monitoring wells MW-4 and B7MW were removed. Robert Weimer
5/17/2011 Update or Other Action ADEC letter requesting by August 1, 2011 a release investigation workplan, including a schedule for conducting the work, for installing at least 3 long-term monitoring wells and collecting soil and groundwater samples to help define the extent of the soil and groundwater contamination. Robert Weimer
7/13/2011 Meeting or Teleconference Held Discuss site status with property owners consultant. Property owner is looking for funds to do the site work requested in the May 17, 2011 ADEC letter. They may need to request an extension or have the lender and/or prospective purchaser talk to ADEC about the site. Robert Weimer
9/16/2011 Site Characterization Workplan Approved DEC conditionally approves August 31, 2011 release investigation work plan. The work plan proposes to sample soil borings and install three monitoring wells to help identify the extent of the remaining contamination at this site. This work plan is approved with the following conditions: 1. The borings within the former excavation areas need to be at least 12 feet below grounds surface so the soils at base of the former excavation can be assessed. 2. All boreholes that are not completed as monitoring wells need to be grouted/sealed so they do not create a potential preferential pathway to the groundwater. 3. Complete copies of field notes need to be provided with the report. Robert Weimer
3/16/2012 Meeting or Teleconference Held Sundet, Chambon and Weimer met with staff from Shannon & Wilson to discuss their most recent report submitted to CSP regarding the Bekin’s Northwest (Bekins) site in Anchorage. Bekins plan to sell the property and discussion focused upon final investigation work that needs to occur before consideration by CSP for a clean closure with institutional controls determination. S&W will provide laboratory analysis results, laboratory check list and field notes from December 2011 ground water sampling. CSP requests the ground water (GW) direction be determined. GW sampling will be conducted in April and June of 2012. Katrina Chambon
7/3/2012 Site Characterization Workplan Approved Conditional Approval of Work Plan for Monitoring Well Installation, Decommissioning, and Repair. This work plan is approved with the following conditions: CSP requests that the new replacement monitoring well be located within three (3) feet of the B24MW.CSP requests that groundwater flow be determined. Complete copies of field notes need to be provided with the report. Please provide three (3) working days advance notice when planning to do work, to give us an opportunity to be on site to inspect. Katrina Chambon
7/13/2012 Site Characterization Workplan Approved Conditional Approval of Work Plan for Monitoring Well Installation, Decommissioning, and Repair. The work plan proposes: decommission a well; well installation and development, and sampling; well repair; monument replacement; and surveying. This work plan is approved with the following conditions: CSP requests that the new replacement monitoring well be located within three (3) feet of the B24MW. CSP requests that groundwater flow be determined. Complete copies of field notes need to be provided with the report. Please provide three (3) working days advance notice when planning to do work, to give us an opportunity to be on site to inspect. Katrina Chambon
7/26/2012 Site Visit CSP staff conducted a site visit to observe groundwater monitoring well installation. Katrina Chambon
8/2/2012 Site Visit CSP staff conducted site visit to observe groundwater sampling. Katrina Chambon
1/23/2013 Document, Report, or Work plan Review - other Bekin’s consultant conducted a Limited Removal Action on February 11, 2011 and February 15, 2011. Approximately 245 tons of contaminated soil was thermally treated. The depth of the excavation was 10 ft below ground surface. The area and perimeter of the excavation were approximately 850 square feet and 125 linear feet. The excavation was backfilled with 17 cubic yards of gravel that was blended with 450 pounds of Oxygen Release Compound. Thirteen field screening samples were collected from the excavation sidewall and 16 field screening samples were collected from the excavation base. Based on the field screening five analytical samples and one duplicate were collected and analyzed for gasoline range organics (GRO), benzene, toluene, ethylbenzene, and xylenes (BTEX) and naphthalene. Two soil samples (S11 & S12) exceeded DEC’s most stringent 18 AAC 75.341, i.e., Table B1 migration to groundwater (MTG) for GRO. Cleanup level is 300 mg/kg and GRO concentrations were 1,030 mg/kg and 1,730 mg/kg. Twelve soil samples exceeded their 18 AAC 75.341 cleanup levels for benzene in soil MTG. Benzene concentrations ranged from 0.111 mg/kg to 0.678 mg/kg, cleanup level for benzene is 0.025 mg/kg. Two soil samples (S11 & S12) exceeded DEC’s most stringent 18 AAC 75.341, i.e., Table B1 MTG for ethylbenzene and xylenes. Ethylbenzene concentrations were 19.5 mg/kg and 17.4 mg/kg, cleanup level is 6.9 mg/kg. Xylenes concentrations were 98.6 mg/kg and 111 mg/kg, cleanup level is 63 mg/kg Katrina Chambon
5/29/2013 Site Visit Site visit to observe monitoring well decommissioning. Katrina Chambon
5/29/2013 Document, Report, or Work plan Review - other The Alaska Department of Environmental Conservation (DEC), Contaminated Sites Program (CSP), has completed its review of the subject work plan for the above referenced site. The work plan was received at our Anchorage office by e-mail on May 28, 2013. The work plan proposes to decommission monitoring wells MW-6, B8MW-R, B9MW, B22MW, B23MW, and B25MW. This work plan is approved with the following conditions: 1.CSP requests that monitoring well decommissioning be performed in accordance to DEC’s Monitoring Well Guidance, dated November 2011. Katrina Chambon
6/11/2013 Institutional Control Record Established Institutional Controls established and entered into the database. Katrina Chambon
6/11/2013 Cleanup Complete Determination Issued Contamination remains in soil and groundwater on site above established default cleanup levels, including at monitor well B25MW with elevated levels of GRO that has only been sampled twice. However, overall the contamination has been delineated and the contaminant plume is in a stable or decreasing state, and remains on the subject property. Based on this as well as other factors, ADEC has determined there is no unacceptable risk to human health or the environment. Therefore this site will be issued a Corrective Action Complete Determination- Institutional Controls (ICs) determination subject to the following. 1.Any future change in land use may impact the exposure assumptions cited in this document. If land use and/or ownership changes, current ICs may not be protective and ADEC may require additional remediation and/or ICs. Therefore the RP/Co. shall report to ADEC every three (3) years to document land use, or report as soon as RP/Co. becomes aware of any change in land ownership and/or use, if earlier. The report can be sent to the local ADEC office or electronically to DEC.ICUnit@alaska.gov. 2.A Notice of Environmental Contamination (deed notice) shall be recorded in the State Recorder’s Office by June 15, 2013 that identifies the nature and extent of contamination at the property and any conditions that the owners and operators are subject to in accordance with this decision document, and a copy of the recorded document be provided to ADEC by June 30, 2013. 3.Installation of drinking water wells will require prior approval from ADEC. 4.All existing groundwater monitoring wells must be decommissioned by May 30, 2013 in accordance with ADEC guidance, and documented in a report submitted to ADEC by June 15, 2013. 5.Any proposal to transport soil or groundwater off site requires ADEC approval in accordance with 18 AAC 78.6009 (h). A “site” [as defined by 18 AAC 75.990 (115)] means an area that is contaminated, including areas contaminated by the migration of hazardous substances from a source area, regardless of property ownership. (See attached site figure.) 6.If a building is proposed to be constructed within 30 feet of the existing boundary of the estimated contaminated area as identified in Figure 1, a vapor intrusion evaluation is required prior to construction and a work plan provided to ADEC for approval. 7.The owner/operator shall contact ADEC at least five working days (5) prior to any construction planned in the contaminated area and which involves work that is three (3) feet or more below ground surface (bgs). A work plan may be required to be submitted to ADEC for work in this area that is over three (3) feet below bgs. (See attached site figure). 8.The owner/operator shall promptly inform any worker of the potential for inhalation and dermal contact exposure risk if work will be within the contaminated area as shown in the attached site figure and below three (3) feet below ground surface. The owner/operator shall also comply with any local, state or federal regulation pertaining to workers in this area. 9.Movement or use of contaminated material in a manner that results in a violation of 18 AAC 70 water quality standards is prohibited. Katrina Chambon
6/13/2013 Institutional Control Compliance Review IC compliance review conducted and staff changed from Katrina Chambon to IC Unit. Reminder system set-up to follow-up on groundwater monitoring wells decomissioning report and to follow-up with the responsible party for three-year review in 2016. Kristin Thompson
8/14/2013 Document, Report, or Work plan Review - other Reviewed a copy of the Shannon & Wilson, Inc. (S&W) "Monitoring Well Decommissioning, 299 West 64th Avenue, Anchorage, Alaska; ADEC File No. 2100.26.128" dated June 6, 2013. The six remaining groundwater monitoring wells (MW-6, B8MW-R, B9MW, B22MW, B23MW, and B25MW) were decommissioned in accordance with the ADEC-approved work plan dated May 28, 2013. This IC requirement was removed from the closure record. Kristin Thompson
5/16/2016 Institutional Control Compliance Review IC compliance review conducted. IC reminder letter issued to the responsible party on this date. Reminder system set to follow-up in three years. Kristin Thompson
5/31/2016 Institutional Control Update The IC reminder letter was returned undeliverable. Re-issued to a different address on this date. Kristin Thompson
7/5/2016 Institutional Control Update Received three-year notification of current property status which has not changed. However, the companies' name was changed from Bekins Moving and Storage to Northern Pacific Holding, Inc. Affiliates information was updated to reflect this change, including their new address. All future correspondence will be sent to the Northern Pacific Holding, Inc. address. Nathan Maxwell
6/10/2019 Institutional Control Compliance Review IC Compliance review conducted and a reminder letter was issued to the current landowner. The next compliance review will be completed in three years' time. Evonne Reese
6/20/2019 Institutional Control Compliance Review Received a notice from the property owner stating that they are aware of the ICs and that the land use has not changed. Evonne Reese
2/8/2023 Institutional Control Compliance Review IC compliance review conducted on this date and a reminder letter was issued. The next compliance review will be in 2026. Jennifer McGrath
2/24/2023 Institutional Control Periodic Reporting Received confirmation letter from the landowner stating that ICs are in compliance. Jennifer McGrath

Contaminant Information

Name Level Description Media Comments
Benzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation GroundwaterSoilGroundwaterSoil Benzene concentrations in soil is at 7.20 mg/kg and the plume has been defined.
GRO > Human Health/Ingestion/Inhalation GroundwaterSoil GRO contamination remains in soil at 2,500 mg/kg. The plume has been characterized and defined.
Ethylbenzene > Table C Groundwater Concentration in groundwater remain at 0.997 mg/L
Toluene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Soil concentrations remain at 11.0 mg/kg
Ethylbenzene Between Method 2 Migration to Groundwater and Human Health/Ingestion/Inhalation Soil Concentrations remain at 8.84 mg/kg

Control Type

Type Details
Notice of Environmental Contamination

Requirements

Description Details
Excavation / Soil Movement Restrictions The owner/operator shall contact ADEC at least five working days (5) prior to any construction planned in the contaminated area and which involves work that is three (3) feet or more below ground surface (bgs). A work plan may be required to be submitted to ADEC for work in this area that is over three (3) feet below bgs.
Groundwater Use Restrictions
New Construction Restrictions The owner/operator shall promptly inform any worker of the potential for inhalation and dermal contact exposure risk if work will be within the contaminated area as shown in the attached site figure and below three (3) feet below ground surface. The owner/operator shall also comply with any local, state or federal regulation pertaining to workers in this area.
Advance approval required to transport soil or groundwater off-site.
Other If a building is proposed to be constructed within 30 feet of the existing boundary of the estimated contaminated area as identified in Figure 1, a vapor intrusion evaluation is required prior to construction and a work plan provided to ADEC for approval
Other Any future change in land use may impact the exposure assumptions cited in this document. If land use and/or ownership changes, current ICs may not be protective and ADEC may require additional remediation and/or ICs. Therefore the RP/Co. shall report to ADEC every three (3) years to document land use, or report as soon as RP/Co. becomes aware of any change in land ownership and/or use, if earlier. The report can be sent to the local ADEC office or electronically to DEC.ICUnit@alaska.gov.

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State of Alaska Department of Environmental Conservation

P.O. Box 111800
Juneau, AK 99811-1800
Phone: 907-465-5066
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