| Action Date |
Action |
Description |
DEC Staff |
| 8/10/1998 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77644 |
Former Staff |
| 8/10/1998 |
Site Added to Database |
|
Former Staff |
| 8/13/1998 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
Work began to remove two 4,000 gallon USTs from the site. Contamination was subsequently discovered. The USTs and related piping were disposed of at Newell Recycling and receipts provided to document disposal. The excavation was lined and backfilled with clean gravel. |
Former Staff |
| 10/23/1998 |
Underground Storage Tank Site Characterization or Assessment |
Reviewed the AGRA Earth & Environmental Inc. "UST Closure Report" dated 9/15/98 received by ADEC 9/24/98. Work began to remove 2-4,000 gallon USTs (one diesel and one gasoline), related piping, and dispenser island from the site. Contamination was subsequently discovered. In place soil benzene soil contamination ranged from 1.4 to 49 mg/kg. Soil samples beneath the piping and dispenser exceeded cleanup levels for benzene (up to 49 mg/kg under the piping from the UST to dispenser), GRO (up to 3,100 mg/kg under the dispenser island), and DRO (up to 4,100 mg/kg under the dispenser island). ~55 cubic yards of contaminated soil were excavated and stockpiled. All of the stockpile contained soils above cleanup levels. Contaminated soil above cleanup levels remains in the vicinity of the excavation. The USTs and related piping were disposed of at Newell Recycling. Receipts were provided to document their disposal. The excavation was lined and backfilled with clean gravel. Drinking water is supplied by AWWU. The report is missing a completed Summary Form. In a letter from the ADEC, the RP was requested to provide a completed Summary Form in the next report; perform additional characterization in a release investigation; and provide a plan for dealing with the contaminated soil stockpile. There was no obvious indication that GW was encountered. Evaluation of GW impacts need to be addressed in a forthcoming Release Investigation. Action updated by Petrik. |
Colin Basye |
| 11/4/1998 |
Update or Other Action |
Received a letter dated 11/2/98 from AGRA addressing some of the issues pointed out in the 10/23/98 DEC letter. A Summary Form was completed and submitted to DEC by AGRA. Action added by Petrik. |
Colin Basye |
| 12/7/1998 |
Update or Other Action |
Received the last page of the Summary Form that was lacking necessary information that was originally submitted to the department on 11/4/98 by AGRA and pointed out in ADEC letter dated 11/19/98. Action added by Petrik. |
Colin Basye |
| 10/20/1999 |
Update or Other Action |
A letter was sent to the RP indicating that the work plan requested by DEC by 1/11/99 to perform a release investigation has not yet been received. Action added by Petrik. |
Elaine Cederstrom |
| 11/18/1999 |
Leaking Underground Storage Tank Corrective Action Underway |
Approval was granted to a request by AMERICO Real Estate Company to dispose of approximately 71 tons of petroleum impacted soil by B and C Excavating to the Anchorage Sand and Gravel O'Malley Road Facility for thermal desorption. Action added by Petrik. |
Elaine Cederstrom |
| 2/15/2000 |
Release Investigation |
Reviewed and approved the AGRA "Work Plan for Release Investigation" dated 12/12/99, received by the department by fax on 12/13/99 and by hard copy on 1/18/00. Action added by Petrik. |
Mike Mooney |
| 7/31/2000 |
Update or Other Action |
Received documentation from Alaska Soil Recycling dated 6/26/00 indicating that 84.57 tons (~63 cubic yards) of petroleum impacted soil were received from this site and thermally treated. Analytical results indicated that treated soil was below ADEC cleanup levels. Action added by Petrik. |
Mike Mooney |
| 8/23/2000 |
Release Investigation |
Reviewed a copy of the AGRA Phase I "Release Investigation Report" dated June 2000 received by the department 7/18/00. Four soil borings were drilled and three samples from three borings and two from the fourth were taken. Monitoring wells were installed in each of the four borings and screened from ~11' to 16' bgs. Found soil and water contamination. Analytical results for GRO and BTEX exceeded cleanup levels at least 10' west of the former USTs and at least 15' west of the former pump island. Contamination east of these locations was unable to be evaluated due to the presence of utilities. There was benzene contamination above cleanup levels in all samples, ranging up to an estimated 67 mg/kg in a duplicate sample in Boring 2. There were exceedances of DRO, GRO (up to 9,300 mg/kg), toluene (up to 750 mg/kg), ethylbenzene (up to 280 mg/kg), and total xylenes (up to 1,400 mg/kg) in borings B2 and B4. Sample B2 at 5' bgs was at 420 mg/kg DRO but attributed to weathered gasoline rather than diesel fuel. Tetrachloroethene (PCE) was detected at 0.21 mg/kg in Boring B2 at 5' bgs which is above the cleanup level of 0.03 mg/kg. Sent a letter to AGRA this date requesting a work plan for the second phase of further characterization to delineate the lateral extent of the contamination. Requested the work plan by 9/29/00. Action updated by Petrik. |
Mike Mooney |
| 10/13/2000 |
Document, Report, or Work plan Review - other |
Reviewed the AMEC Earth & environmental, Inc. "Work Plan for Second Phase Release Investigation" dated 9/26/00 and received by the department on 9/27/00. In a letter this date the department requested characterization between Boring B2 and the west side of the building and the area directly south of the UST excavation where the utility corridors are located as these may be pathways for contamination to migrate. Action entered by Petrik. |
Mike Mooney |
| 2/26/2001 |
Update or Other Action |
Email sent to AMEC - Doug Buteyn inquiring on status of the ADEC request for a work plan for Phase II Release Investigation. The revised work plan was sent to owners and there has been no word back. Doug will follow up and call me back. |
Mike Mooney |
| 3/14/2001 |
Release Investigation |
On 3/2/01, the department received a "Revised Work Plan for Second Phase Release Investigation" dated 2/27/01. After review, the work plan was approved this date. |
Mike Mooney |
| 10/10/2001 |
Leaking Underground Storage Tank Corrective Action Underway |
During the installation of five monitoring wells at the site on 8/3/01, soils contaminated above cleanup levels for benzene resulted in the borings for MWs 1, 3, and 5. Exceedance for DRO in soils was experienced in MW-3. Request to transport three 55-gallon drums of contaminated soil cuttings to ASR for thermal treatment was granted this date. Action entered by Petrik. |
Robert Weimer |
| 1/22/2002 |
Release Investigation |
Reviewed the AMEC "Release Investigation Summary Report" dated 1/15/02 received 1/22/02. Five monitoring wells were installed and sampled. Exceedances of ADEC soil cleanup levels for benzene detected in soils for MWs 1, 3, and 5. At least one exceedance in soil at MW-4 at 15' bgs for methylene chloride and possibly more depending how questionable lab analyses are viewed. Exceedances of ADEC GW cleanup levels for both GRO and benzene detected in water for MWs 1 and 5. Exceedance of ADEC GW cleanup levels for cis-1,2-dichloroethane detected in water for MWs 1 and 5. Based only on sampling result concentrations it appears that GW is flowing in a southerly direction. Unknown whether it has migrated off site. MW-5 is 20' from south property line. The ADEC requested quarterly groundwater monitoring. Action updated by Petrik. |
Amanda Dreyer |
| 7/1/2002 |
Update or Other Action |
Site transferred from Bush to Dreyer. |
Amanda Dreyer |
| 7/17/2002 |
Update or Other Action |
Letter sent this date requesting quarterly ground water monitoring. |
Amanda Dreyer |
| 11/24/2003 |
Update or Other Action |
Notice of Cost Recovery letter sent to the RP Consultant. |
Amanda Dreyer |
| 6/8/2004 |
Update or Other Action |
Additional GW monitoring this date. Average depth to GW was 5.62' below top of casings. GRO exceeding cleanup levels detected in MW-1 and MW-5. Benzene exceeding cleanup levels detected in MW-1 MW-2, and MW-5. |
Bill Petrik |
| 12/15/2006 |
Update or Other Action |
Staff transferred from Henry to Petrik. |
Aggie Blandford |
| 2/15/2007 |
Update or Other Action |
Ranked the site using the ETM. |
Bill Petrik |
| 9/12/2007 |
Document, Report, or Work plan Review - other |
The CSP reviewed the "Groundwater Monitoring Workplan; U-Haul Facility 826052; 4751 Old Seward Highway, Anchorage, Alaska; Facility ID No. 1201, LUST No. 2410, Reckey No. 1998210022507" dated September 5, 2007, by Blaes Environmental Management, Inc. The work plan was conditionally approved. The minor conditions included adding a historical table of ground water sampling analytical results, a star or similar diagram of historical calculated ground water flow directions, and an explanation of how sampling results will be affected by a water table level above the top of screens in monitoring wells. A Conceptual Site Model and Laboratory Data Review Checklist were also requested. The last sampling on this site occurred over six years ago. |
Bill Petrik |
| 4/22/2009 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the Blaes Environmental Management, Inc., "Groundwater Monitoring Report (Conducted October 4, 2007)" dated 12/10/08, received 12/14/07. 5 on-site MWs were measured for water surface elevation and samples from each sent for laboratory analysis. The average distance from the top of each casing to the surface was 5.22'. Groundwater flow direction was to the west-southwest at an average gradient of 0.011 feet/foot. This direction may not be accurate because the MW screened intervals are submerged. Exceedances of ground water cleanup levels for GRO in MW-1, and for benzene in MW-1, MW-2 and MW-5. Numerous other VOCs were detected in MW-1, MW-4, and MW-5 but none were near cleanup levels. No duplicate sample was submitted. |
Bill Petrik |
| 4/23/2009 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the Blaes Environmental Management, Inc., "Groundwater Monitoring Report (Conducted January 8, 2008)" dated 2/20/08. 4 of the 5 on-site MWs were measured for water surface elevation and samples from each sent for laboratory analysis. The average distance from the top of each casing to the surface was 6.56'. This is approximately 1.28' lower than the average from the 10/4/07 measurements. Groundwater flow direction was to the southwest at an average gradient of 0.028 feet/foot. This direction may not be accurate because the MW screened intervals are submerged. Exceedances of ground water cleanup levels for GRO in MW-1 and MW-5; and for benzene in MW-1, MW-2 and MW-5. PQLs were not low enough for TCE, PCE and methylene chloride to detect whether they exceeded their respective cleanup levels for MW-1 and MW-5. Historical data indicate that the cleanup levels were probably not exceeded. No duplicate sample was submitted. |
Bill Petrik |
| 4/23/2009 |
Site Characterization Report Approved |
Reviewed a copy of the Blaes Environmental Management, Inc., "Groundwater Monitoring Report (Conducted June 3, 2008)" dated 7/31/08. 5 on-site MWs were measured for water surface elevation and samples from each sent for laboratory analysis. The average distance from the top of each casing to the surface was 4.7'. This is approximately 1.91' lower than the average from the 1/8/08 measurements. Groundwater flow direction was to the west-southwest at an average gradient of 0.076 feet/foot. This direction may not be accurate because the MW screened intervals are submerged. Exceedances of ground water cleanup levels for GRO in MW-1 and MW-5; DRO in MW-1 and MW-2; and for benzene in MW-1, MW-2 and MW-5. Numerous other VOCs were detected in MW-1 and MW-5 but none were near cleanup levels. No duplicate sample was submitted. |
Bill Petrik |
| 4/23/2009 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the Watts Architecture & Engineering, P.C., "Groundwater Monitoring Report (Sample Event November 14, 2008)" dated 1/15/09, received 1/23/09. 4 of 5 on-site MWs were measured for water surface elevation and samples from each sent for laboratory analysis. MW-2 was not included in this episode. The average distance from the top of each casing to the surface was 6.2'. This is approximately 1.5' lower than the average from the 6/3/08 measurements. Groundwater flow direction was to the west-southwest at an average gradient of 0.08 feet/foot. This direction may not be accurate because the MW screened intervals are submerged. Exceedances of ground water cleanup levels promulgated on 10/9/08 exists for only benzene in MW-1 and MW-5. Numerous other VOCs were detected in MW-1 and MW-5 but none were near cleanup levels. No duplicate sample was submitted. |
Bill Petrik |
| 5/8/2009 |
Site Characterization Report Approved |
Reviewed a copy of the Watts Architecture & Engineering, P.C., "Groundwater Monitoring Report (Sample Event February 26, 2009)" dated 3/20/09, received 3/26/09, on 4/24/09. 5 on-site MWs were measured for water surface elevation and samples from each sent for laboratory analysis. The average distance from the top of each casing to the surface was 7.17'. This is approximately 0.97' lower than the average from the 11/14/08 measurements. Groundwater flow direction was to the south-southwest at an average gradient of 0.02 feet/foot. This direction may not be accurate because the MW screened intervals are submerged. Exceedances of ground water cleanup levels promulgated on 10/9/08 exists for DRO in MW-1, MW-2, and MW-5; and benzene in MW-1 and MW-5. Numerous other VOCs were detected in MW-1, MW-2, and MW-5 but none were near cleanup levels. No duplicate sample was submitted. Sent a letter this date requesting the RP to address numerous issues as well as submit a work plan for semi-annual GW monitoring and corrective action. |
Bill Petrik |
| 5/8/2009 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77644 Former USTs, Piping, and Dispenser Island. |
Bill Petrik |
| 9/15/2009 |
Update or Other Action |
On 8/28/09, the CSP reviewed a copy of the Watts Architecture & Engineering, P.C. "Groundwater Monitoring Report (Sample Event: May 28, 2009)" dated 7/1/09, received 7/6/09. Watts Architecture & Engineering, P.C. conducted a groundwater monitoring and sampling event at the site on 5/28/09 involving the five on-site wells. Purge water was stored in a 55-gallon drum on site pending fate based on analytical results. The static water level below the ground surface (bgs) varied between 4.5’ and 5.79’ and the groundwater elevation rose an average of 1.98’ since the last monitoring event on 2/26/09. The GW flow direction was to the southwest at a gradient of 0.19 feet/foot.
One sample from each well was submitted for laboratory analysis for GRO, DRO, BTEX, and VOCs. MWs 3 and 4 were ND for all target analytes. GRO was detected in MWs 1 and 5 at 1.3 mg/l and 4.34 mg/l, respectively. The later value was above the cleanup level of 2.2 mg/l. DRO was detected in MWs 1, 2, and 5 at 3.16 mg/l, 2.0 mg/l, and 0.949 mg/l, respectively. The first two values were above the cleanup level of 1.5 mg/l. Benzene in wells MW-1, MW-2, and MW-5 were 0.561 mg/l, 0.00294 mg/l, and 1.07 mg/l, respectively. The first and third well values were substantially above the cleanup level of 0.005 mg/l. Toluene was only detected in MW-5 at 0.21 mg/l, far below the cleanup level of 6.5 mg/l. Ethylbenzene was detected in MW-1 and MW-5 at 0.114 mg/l and 0.127 mg/l, respectively, far below the cleanup level of 6.9 mg/l. Total xylenes were also detected in both MW-1 and MW-5 at 0.3102 mg/l and 1.815 mg/l, respectively, far below the cleanup level of 63 mg/l. MTBE was only detected in MW-5 at 0.0242 mg/l, well below the cleanup level of 0.47 mg/l. TCE and PCE were ND in all wells but the method reporting limit (MRL) for wells MW-1 and MW-5 was 0.02 mg/l, well exceeding the cleanup level of 0.005 mg/l. Similarly, methylene chloride was ND in all wells but the MRL for wells MW-1 and MW-5 was 0.1 mg/l, far exceeding the cleanup level of 0.005 mg/l. Based on the other detections in these two wells and their magnitudes, there is a likelihood that the actual values of these three contaminants were above cleanup levels in these two wells. Cis-1,2-DCE was only detected in MW-1 at 0.0354 mg/l, below the 0.07 mg/l cleanup level. 1,2,4-trimethylbenzene and 1,3,5-trimethylbenzene were both detected in MW-5 but at levels substantially below their cleanup levels.
A letter was sent to the responsible party this date reiterating a request for submittal of numerous items requested in a CSP letter dated May 8, 2009 that were requested by June 8, 2009. GRO, DRO, and benzene remain above the 18 AAC 75.344 Table C groundwater cleanup levels in at least one well after eight years of long-term monitoring with no obvious trend. |
Bill Petrik |
| 10/22/2009 |
Update or Other Action |
Received a telephone call from Cecile Fleckten of ERM Syracuse regarding the latest site status. ERM concurs with the observations and requests of the last letter the Contaminated Sites Program (CSP) sent to the responsible party. Cyrus from the Seattle ERM Office will be at the site on 11/3/09 to perform a monitoring well assessment and other related site work. A work plan will be sent to the CSP in the future for work next spring. |
Bill Petrik |
| 11/3/2009 |
Site Visit |
Went to the site and met Cyrus Gorman. We chatted about some site issues and the status of some of the monitoring wells (MWs). There appears to be some MWs on the property to the south of U-Haul where a business called the Club Oasis is located. There also might be two MWs located on the property located to the north of the site at Quik-Lube but we were not sure if they were MWs or not. Two gents were there recording down-hole camera shots of the MW casings. The water was clear enough in one MW that you could see the screening interval but the water in the other two was cloudy and it may be hard to determine where the screens started due to the cloudiness. |
Bill Petrik |
| 3/31/2010 |
Document, Report, or Work plan Review - other |
Reviewed a copy of the Environmental Resources Management "Field Investigation - November 2009; U-Haul Facility No. 826052; 4751 Old Seward Highway; Anchorage, Alaska; ERM Project No. 0092165 Phase 00017; ERM Proposal No. TS0824242584" dated 2/8/10 and received 2/10/10. The document summarized remedial and site characterization site history to date.
On 11/2/09 all 5 on-site MWs were inspected. MWs 1 through 4 appear to be in good condition. However, MW-5 is in need of repair but the well cap was unable to be removed. MWs 1, 3, and 4 were inspected using a submersible camera and well screens determined to start in the MWs between 10 to 11’ bgs and continue to the bottom of the wells. These screened intervals are below the water table surface.
Building inspection noted a lateral floor drain running north-south inside the shop area and drains into two sumps. The sumps are reportedly cleaned out more than twice a year. The shop area is used for trailer hitch installation and to add fluids to vehicle but regular vehicle maintenance is not conducted at the shop. However, an on-site storage of motor oil, antifreeze and a solvent (Stoddard Solvent) for the parts washer exists. At the rear of the shop, oily liquid was observed draining across the rear parking area. And an old parts washer on a pallet with some remaining sludge was being kept nearby.
ERM observed four off-site MWs on the south adjacent property. The building labeled as "Club Oasis" was shuttered and appeared no longer in business. Staples Fulfillment Center and DeWalt Authorized Repair Center are located south of the Site. Adjacent to the property to the north are a Quick Lube facility and MS Metal Sales Manufacturing Corporation. To the west of, several automobile dealerships and to the east adjacent properties were residential dwellings.
The document recommended that the on-site GW MWs will need to be replaced after a work plan is submitted and approved by Amerco and the ADEC. ERM is recommending that passive soil vapor samples be collected prior to replacing/abandoning or installing any additional groundwater monitoring wells on-site. The passive soil vapor samples should help evaluate the extent of contamination on-site. General housekeeping inside the U-Haul facility was good, although secondary containment should be used for stored automotive fluids and solvents. The rear of the U-Haul facility should be cleaned up and the old parts washer should be disposed of properly. ERM is recommending that the suspended conduit pipes be capped and that the electrical panel be inspected by a qualified electrician and U-Haul clean and inspect the sumps as part of routine yearly maintenance because potential hazardous automotive fluids could flow into the lateral floor drain in the shop area. |
Bill Petrik |
| 4/30/2010 |
Site Characterization Workplan Approved |
The CSP reviewed the Environmental Resources Management (ERM) "Additional Site Investigation Work Plan" dated 4/22/10, received on 4/23/10 for the site. The intent of the work plan was to define the magnitude and extent of soil and GW contamination at the site; determine the source of the chlorinated solvents identified at the site; and assess whether other potential sources of petroleum contamination have contributed to the petroleum contamination identified at the site. Tasks associated with the intent of the work plan included soil/gas sampling, soil borings and MW installations, soil and GW sampling and lab analysis, IDW management and disposal, and report submittal. The work plan was conditionally approved. The CSP suggested collection of the soil/gas samples in late summer in lieu of spring to optimize the volatilization of potential contaminants. The CSP requested: the Laboratory Data Review Checklist for Air Samples for each round of soil/gas sampling be completed; a Laboratory Data Review Checklist submitted to the CSP for each laboratory data packet; when no contamination is identified via field screening during borehole sampling a sample is taken from the smear zone; submittal of a blind duplicate soil and GW sample to the lab for analysis on a 10% basis; for quality assurance and control purposes, if possible, it is preferred that duplicate samples are taken from sources of the highest detectable or suspected contamination; PAH soil and groundwater analysis will be required on a 10% sampling basis. |
Bill Petrik |
| 12/7/2010 |
Site Visit |
Met with Wayne Coppel of Environmental Resources Management (ERM) and observed finalizing the installation of a monitoring wells (MW) at the site per the latest work plan. The MW was actually on the adjacent property to the south where contamination was detected. Also discussed the site findings to date and other site issues as well as plans for future work. |
Bill Petrik |
| 3/30/2011 |
Document, Report, or Work plan Review - other |
Reviewed the Environmental Resources Management (ERM) report "Monitoring Well Construction Logs, UHaul Facility No. 826052, 4751 Old Seward Highway, Anchorage, Alaska, ADEC Hazard ID 23333, ADEC Lust Event ID 2410, ERM Project No. 0115728 Phase 09" dated and received 1/13/11. The report documented the installation of four (two on- and two off-site) monitoring wells (MW-UH-01, and MW-UH-02; MW-ON-01 and MW-ON-02) on 12/7-8/10 by ERM and a subcontractor and included construction logs for them. No soils data was included with the report. ERM collected GW samples from the site MWs on 12/17/10 and will be submitted to the ADEC at a later time. |
Bill Petrik |
| 8/9/2011 |
Update or Other Action |
ERM called to let DEC know that the GW monitoring report will be submitted in approx. 6-8 weeks - pending cllient approval. (ERM project manager can be contacted at 425-214-0452) |
Linda Nuechterlein |
| 4/11/2012 |
Meeting or Teleconference Held |
Phone call to ERM to get an update on the site regarding groundwater monitoring that occurred in 2010, no report was received as of date. Oasis has merged with ERM; Oasis will be working at the site based out the Anchorage, AK office. Oasis will contact responsible party to determine when the report will be approved and delivered. |
Katrina Chambon |
| 4/25/2012 |
Document, Report, or Work plan Review - other |
Soil Gas Survey
ERM collected soil gas samples on an approximate 45-foot grid across the exterior portions of the Site as a means of screening for chlorinated solvents sources and assessing large-scale trends in petroleum concentrations. ERM reviewed the analytical results from the soil gas sampling and identified a petroleum “hot spot” and four chlorinated solvent “hot spots” for further investigation. ERM selected benzene, toluene, ethylbenzene and total xylenes (BTEX) and chlorinated solvents constituents (trichloroethylene, TCE and tetrachloroethylene, PCE) to be presented as isopleths maps. The BTEX concentration trends are consistent with a petroleum contaminant source area in the vicinity of the former gasoline and diesel underground storage tank (UST). The TCE and PCE show four “hot spots” along the northern portion of the shop and between the main building and storage building.
Soil Sampling
Eight soil boring samples were collected from the site to be analyzed for petroleum and chlorinated solvents. Gasoline range organics (GRO), diesel range organics (DRO) and/or residual range organics (RRO) were detected in soil samples from six borings (B-01 through B-06). GRO concentrations ranged from less than (<) 0.321 mg/kg to 110 mg/kg. DRO concentrations ranged from < 16.5 mg/kg to 418 mg/kg prior to analyzing with silica gel and < 13.0 mg/kg to 141 mg/kg after silica gel technique. RRO concentrations ranged from < 27.2 mg/kg to 7,190 mg/kg prior to analyzing with silica gel and <13.6 mg/kg to 317 mg/kg after silica gel technique. DRO concentrations exceed DEC 18 AAC 75.341migration to groundwater concentrations. BTEX were detected in soil samples from six soil borings, benzene and toluene exceed DEC 18 AAC 75.341migration to groundwater concentrations. Benzene concentrations ranged from < 0.00204 mg/kg to 1.830 mg/kg. Toluene concentrations ranged from < 0.00701 mg/kg to 7.630 mg/kg. Volatile organic compounds (VOC) were detected in soil samples from two boreholes. PCE concentrations ranged from < 0.00430 mg/kg to 0.541 mg/kg. TCE concentrations ranged from < 0.00430 mg/kg to 0.315 mg/kg. Methylene Chloride concentrations ranged from < 0.0162 mg/kg to 0.450 mg/kg. These exceed DEC 18 AAC 75.341migration to groundwater concentrations. Polycyclic aromatic hydrocarbons (PAHs) were detected in soil samples from six borings; however, none of the soil samples showed PAHs concentrations exceeding DEC 18 AAC 75.341cleaup concentrations. Please note that GRO, VOC and BTEX soil samples from bore holes BO-01 through BO-06 are considered biased low due to all volatile jars being improper. According to Sample Receipt Form 1106497 most of the jars had loose lids, possibly causing evaporation.
Groundwater Sampling
Groundwater samples were collected from four monitoring wells in December 2010 and June 2011. GRO and DRO were detected in groundwater from two of the four wells during the December 2010. GRO concentrations ranged from < 31 µg/L to 151,000 µg/L and DRO concentrations ranged from <120 µg/L to 557 µg/L. GRO concentrations exceed DEC 18 AAC 75.345 Table C groundwater cleanup concentrations in monitoring well MW-UH-01. One or more of the BTEX constituents was detected in groundwater from all four monitoring wells during the December 2010 sampling event. However, only the concentrations of BTEX constituents in MW-UH-01 exceeded DEC 18 AAC 75.345 Table C cleanup concentrations. Benzene concentrations ranged from < 0.120 µg/L to 48,500 µg/L , toluene concentrations ranged from < 0.310 µg/L to 41,000 µg/L , ethylbenzene concentrations ranged from < 0.310 µg/L to 2, 620 µg/L and xylene concentrations ranged from < 0.940 µg/L to 13, 700. VOCs and PAHs did not exceed DEC 18 AAC 75.345 Table C cleanup concentrations.
GRO and DRO were detected in groundwater from only one monitoring well (MW-UH-01) during the June 2011 sampling period. GRO concentrations ranged from < 31.0 µg/L to 171,000 µg/L and DRO concentrations ranged from < 120 µg/L to 1,840 µg/L. BTEX was detected in groundwater from five of the monitoring wells, only the concentrations of BTEX constituents in MW-UH-01 exceeded DEC 18 AAC 75.345 Table C cleanup concentrations.
Benzene concentrations ranged from < 0.120 µg/L to 452,500 µg/L, toluene concentrations ranged from < 0.310 µg/L to 37,900 µg/L, ethylbenzene concentrations ranged from < 0.310 µg/L to 3,650 µg/L and xylene concentrations ranged from < 0.940 µg/L to 17,800 µg/L. VOC 1-2, dichloroethane concentrations ranged from < 0.150 µg/L to 43.5 µg/L, exceeding DEC 18 AAC 75.345 Table C cleanup concentrations in well MW-UH-01. No other VOCs or PAHs exceeded DEC 18 AAC 75.345 Table C cleanup concentrations
|
Katrina Chambon |
| 5/3/2012 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77644 Former USTs, Piping, and Dispenser Island. |
Katrina Chambon |
| 6/25/2012 |
Document, Report, or Work plan Review - other |
Reviewed work plan for summer 2012 groundwater monitoring. Sent email requesting Oasis to change parts of work plan |
Katrina Chambon |
| 7/6/2012 |
Site Characterization Workplan Approved |
This work plan is approved with the following conditions: Complete copies of field notes need to be provided with the report. 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 |
| 7/23/2012 |
Site Visit |
Quality Control Officer conducted site visit to observe groundwater sampling and soil sampling. |
Katrina Chambon |
| 7/25/2012 |
Site Visit |
Quality Control Officer conducted site visit to observe groundwater sampling and soil sampling. |
Katrina Chambon |
| 10/23/2012 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77644 Former USTs, Piping, and Dispenser Island. |
Katrina Chambon |
| 12/6/2012 |
Document, Report, or Work plan Review - other |
The report present the sampling results from the soil sampling, monitoring well construction and development, and groundwater sampling that occurred from July 23 through July 26, 2012.
One borehole was advanced near the shop building in order to assist in the delineation of the chlorinated solvent contamination. The borehole location was drilled near the northwest corner of the shop, 5 feet to 10 feet from the building. The source of contamination is undetermined; however, ERM suggested in their April 2012 report that the contamination could be from an off source site or from prior operations that occurred at the UHaul property. CSP does not agree the solvent source is from an off source site. Two soil samples were collected, one from soils just above the groundwater interface, i.e., 5.5 to 6.5 ft below ground surface (bgs), and the other soil sample from a depth of 8.5 to 9.5 feet bgs. The borehole was completed as a groundwater monitoring well, UU-10. Soil samples were analyzed for gasoline range organics (GRO), diesel range organics (DRO), benzene, toluene, ethylbenzene, and xylenes (BTEX), and volatile organic compounds (VOCs). All soil samples except one were non-detect or below DEC’s most stringent 18 AAC 75.341, i.e., Table B1 migration to groundwater (MGW) cleanup levels, for soil. Benzene was detected in one soil sample collected at 8.5 to 9.5 ft bgs with a concentration of 0.0381 mg/kg, which exceeds DEC’s 18 AAC 75.341 MGW cleanup level of 0.025 mg/kg for benzene.
Two soil samples and one duplicate were collected near the main building in order to further define the benzene plume and to assist in determining the potential vapor intrusion in the main building. Soil samples were collected from 1 to 2 ft bgs and at 2 to 3 ft bgs. Soil samples were analyzed for GRO, DRO, BTEX, VOCs, and polynuclear aromatic hydrocarbons (PAHs). All soil samples for these contaminants were non-detect or below their 18 AAC 75.341 Table B1 MGW cleanup levels for soil.
Groundwater samples were collected from the new monitoring well (MW-UH-10) and the four existing groundwater monitoring wells (MW-UH-01 thru MW-UH-4). A total of 5 groundwater samples and 2 duplicates were collected and analyzed for GRO, DRO, BTEX, VOCs, and PAHs. Monitoring well MW-UH-01 and its duplicate was also analyzed for lead. Results from MW-UH-02 thru MW-UH-04 (except benzene) and MW-UH-10 were non-detect or showed concentrations below their 18 AAC 75.345 Table C cleanup levels for groundwater. MW-UH-04 had a benzene concentration of 0.0116 mg/L, which exceeds its 18 AAC 75.345 cleanup level of 0.005 mg/L.
Contaminant results from MW-UH-01 that exceed their 18 AAC 75.345 cleanup levels in groundwater are listed below.
• GRO concentration of 249 mg/L, cleanup level is 2.2 mg/L
• DRO concentration of 4.95 mg/L, cleanup level is 1.5 mg/L
• Benzene concentration of 47.5 m/L, cleanup level is 0.005 mg/L
• Toluene concentration of 55.1 mg/L, cleanup level is 1.0 mg/L
• Ethylbenzene concentration of 5.24 mg/L, cleanup level is 0.7 mg/L
• Xylenes concentration of 25.8 mg/L, cleanup level is 10.0 mg/L
• 1,2,4- Trimethylbenzene concentration of 2.04 mg/L, cleanup level is 1.8 mg/L
• 1-2,-Dichlorethane concentration of 0.040 mg/L, cleanup level is 0.005 mg/L
Numerous groundwater monitoring events were completed at the site between August 2001 and May 2009. Historical groundwater levels range between 3.63 to 8.13 feet bgs and groundwater flow appears to be oriented in a west-northwest to south-southwest direction. The groundwater flow during the July 2012 event showed the groundwater flow towards the south-southwest.
|
Katrina Chambon |
| 1/16/2013 |
Document, Report, or Work plan Review - other |
The reports present the sampling results from thegroundwater sampling that occurred October 25, 2012.
Groundwater samples were collected from the existing monitoring wells (MW-UH-01 thru MW-UH-04, and MW-UH-10) and from the two monitoring wells located off property (MW-ON-01 and MW-ON-02) on October 25, 2012. A total of 7 groundwater samples and 2 duplicates were collected and analyzed for VOCs, GRO and DRO. Results from MW-02 and MW-UH-10 were non-detect or showed concentrations below their 18 AAC 75.345 Table C cleanup levels for groundwater. MW-UH-02 had a DRO concentration of 1.53 mg/L, MW-UH-04 had a benzene concentration of 5.07µg/L. MW-ON-01 had a benzene concentration of 45.9 µg/L and MW-ON-02 had a concentration of 39.8 µg/L.
Contaminant results from MW-UH-01 that exceed their 18 AAC 75.345 cleanup levels in groundwater are listed below. •GRO concentration of 180 mg/L, cleanup level is 2.2 mg/L, DRO concentration of 5.25 mg/L, cleanup level is 1.5 mg/L •Benzene concentration of 40.3 m/L, cleanup level is 0.005 mg/L• Toluene concentration of 32.9 mg/L, cleanup level is 1.0 mg/L• Ethylbenzene concentration of 4.2 mg/L, cleanup level is 0.7 mg/L•Xylenes concentration of 24.7 mg/L, cleanup level is 10.0 mg/L
•1,2,4- Trimethylbenzene concentration of 2.49 mg/L, cleanup level is 1.8 mg/L •1-2,-Dichlorethane concentration of 0.043 mg/L, cleanup level is 0.005 mg/L
The target level for possible indoor air inhalation risk in groundwater for 1,2,4 trimethylbenzene is 150 µg/L; the last measured groundwater concentration for 1,2,4 trimethylbenzene was 2,490 µg/L which is 16 times the target level. The target level for possible indoor air inhalation risk in groundwater for benzene is 69 µg/L; the last measured groundwater concentration for benzene was 40,300 µg/L which is 584 times the target level.
CSP requests a Work Plan in accordance with CSP’s October 2012 Vapor Intrusion Guidance for an indoor air sampling event at the main building using EPA Method TO-15. One indoor air sample shall be collected per 1,000 square feet of floor space. Stainless steel summa canisters with a 100 percent cleaning certification by a NELAP-certified laboratory shall be deployed for a period of 8 hours during the indoor air sampling event. The vacuum on each summa canister shall be documented before and after the indoor air sampling event. The building survey notes that there is an “odor associated with fuel from vehicles and equipment present at all times.” CSP suggests that groundwater sampling be conducted semi-annually. CSP requests that a Corrective Action Plan be implemented in 2013 to address the contamination.
|
Katrina Chambon |
| 1/24/2013 |
Site Visit |
Site visit to observe groundwater sampling. |
Katrina Chambon |
| 5/22/2013 |
Site Visit |
CSP conducted site visit to look at neighbooring property groundwater monitoring wells. |
Katrina Chambon |
| 8/1/2013 |
Meeting or Teleconference Held |
Meeting with consultant to discuss vapor intrusion work plan. |
Katrina Chambon |
| 8/13/2013 |
Site Characterization Workplan Approved |
The work plan proposes to perform soil gas sampling along the western side of the main building and sub-slab gas sampling inside the main building. |
Katrina Chambon |
| 9/5/2013 |
Site Visit |
Site visit to observe sub slab sampling. |
Katrina Chambon |
| 9/6/2013 |
Document, Report, or Work plan Review - other |
In May 2013, Groundwater samples were collected from six of the seven groundwater monitoring wells. A total of six groundwater samples and one duplicate were collected and analyzed for GRO, DRO, BTEX, and VOCs. Groundwater monitoring well MW-UH-01 continues to exceed cleanup levels for GRO, DRO, and BTEX. All other samples were below cleanup levels.
CSP Response
CSP requests that the October sampling event include analyzing one groundwater sample for residual range organics (RRO). Please use MW-UH-02 for the RRO analysis.
CSP suggests that MW-UH-03 not sampled due to the results being below cleanup levels for the past five sampling events. CSP will reevaluate the sampling frequency after the October sampling event
|
Katrina Chambon |
| 10/9/2013 |
Site Visit |
Site visit to observe groundwater sampling |
Katrina Chambon |
| 3/20/2014 |
Document, Report, or Work plan Review - other |
Groundwater samples were collected from all seven groundwater monitoring wells. Groundwater continues to exceed cleanup levels for GRO, DRO, benzene, and toluene. GRO was detected up to 43.69 mg/L, DRO was detected up to 2.6 mg/L, benzene was detected up 20.1 mg/L, and toluene was detected up to 4.6 mg/L. The depth of groundwater ranges from 6.75 to 9.97 feet.
Three soil gas points and three temporary sub-slab soil gas points were installed at the site. Laboratory analysis of the soil gas and sub-slab soil gas samples only detected Freon 11
(trichlorofluoromethane). The reported concentrations in two of the samples exceeded the target level. However, Freon 11 is not a contaminant of concern for the UST and has not been detected in the soil. Freon 11 has only once been detected in the groundwater (in MW-UH-04), during the October 2007 groundwater monitoring event at a concentration of 0.095µg/L.
The CSP agrees with the consultants regarding Freon 11 not being a contaminant of concern, CSP also concurs with continuing biannual groundwater monitoring.
|
Katrina Chambon |
| 5/8/2014 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77644 Former USTs, Piping, and Dispenser Island. |
Joshua Barsis |
| 5/20/2014 |
Site Visit |
The Contaminated Sites Program (CSP) performed a site visit on May 20 and 21, 2014 to observe water purging and sampling activities. Purging and/or sampling were observed for the following monitoring wells: MW-ON-01, MW-UH-02, and MW-UH-01. During the purging of MW-UH-01, water was observed at 5.74 feet below ground surface (bgs), and a sheen was noted on top of the water. Additionally, a petroleum odor was present within the well and on the sampling equipment removed from the well. None of the other wells had obvious visual or olfactory signs of contamination. |
Joshua Barsis |
| 8/8/2014 |
Document, Report, or Work plan Review - other |
The ADEC reviewed the May 2014 Groundwater Monitoring Report, dated August 2014. Six groundwater monitoring wells (MW-UH-01, MW-UH-02, MW-UH-04, MW-UH-10, MW-ON-01, and MW-ON-02) were sampled on May 20, 2014. Monitoring Well MW-UH-01, which is the most contaminated well, exhibited a concentration of GRO at 253 mg/L, DRO at 4.14 mg/L, benzene at 43.9 mg/L, toluene at 61.8 mg/L, ethylbenzene at 4.92 mg/L, and xylenes at 21.2 mg/L; all of which exceed the ADEC groundwater cleanup levels outlined in 18 AAC 75.345, Table C. Analytical results for Monitoring Well MW-UH-10 were below, and have historically been below ADEC groundwater cleanup levels. Additionally, MW-UH-10 is located outside the plume area. As such, MW-UH-10 will be removed from the groundwater monitoring program. |
Joshua Barsis |
| 12/5/2014 |
Document, Report, or Work plan Review - other |
The ADEC reviewed the October 2014 Groundwater Monitoring Report, dated November 20, 2014. Five groundwater monitoring wells (MW-UH-01, MW-UH-02, MW-UH-04, MW-ON-01, and MW-ON-02) were sampled in October 2014. Monitoring Well MW-UH-01, which is the most contaminated well, exhibited a concentration of GRO at 280 mg/L, DRO at 3.040 mg/L, benzene at 53.3 mg/L, toluene at 66.6 mg/L, ethylbenzene at 4.84 mg/L, and xylenes at 25.2 mg/L; all of which exceed the ADEC groundwater cleanup levels outlined in 18 AAC 75.345, Table C. A draft remedial action plan is currently being developed for this site. |
Joshua Barsis |
| 3/5/2015 |
Document, Report, or Work plan Review - other |
Reviewed the Corrective Action Plan (CAP), dated for February 2015. The CAP entails excavating a 25 feet long trench to groundwater and adding 2,200 pounds of agricultural grade gypsum (CaSO4 2HO) to the subsurface soils and groundwater. The trench will be excavated up-gradient of the source area and over the course of one or two years, the gypsum will be transported through the source. |
Joshua Barsis |
| 10/1/2015 |
Document, Report, or Work plan Review - other |
Reviewed the Groundwater Monitoring and Corrective Action Report, dated for September 2015. Activities included groundwater monitoring and gypsum soil amendments. "GROUNDWATER SAMPLING DESCRIPTION" Five groundwater monitoring wells (MW-UH-01, MW-UH-02, MW-UH-04, MW-ON-01, and MW-ON-02) were sampled in June 2015. Monitoring Well MW-UH-01, which is historically the most contaminated well, exhibited a concentration of GRO at 160 mg/L, DRO at 4.1 mg/L, benzene at 46 mg/L, toluene at 60 mg/L, ethylbenzene at 6.6 mg/L, and xylenes at 18 mg/L; all of which exceed the ADEC groundwater cleanup levels outlined in 18 AAC 75.345, Table C. "GYPSUM SOIL AMENDMENT DESCRIPTION" Gypsum is an agricultural-grade, granular soil amendment, which for its intended use should provide a slow release of sulfate into the groundwater and theoretically increase the biodegradation of petroleum contamination. The gypsum soil amendment was added to the site via a 50-feet long and 2-feet wide trench. The trench was positioned just up-gradient of the source area and excavated to a final depth of 6.5 feet, which is the historical depth to the water level. A total of 4,400 pounds of gypsum were added to the base of the trench and mixed with the base soils. Groundwater was not encountered at the final trench depth, or in a test pit down to 9.5 feet. Prior to backfilling the trench, two 25-feet sections (connected by a tee at the middle) of perforated polyvinyl chloride (PVC) piping were placed at the bottom of the trench, just above the gypsum amendment. A PVC riser was connected to the middle tee fitting and extended to the ground surface for future applications or gypsum or other remediation options.
|
Joshua Barsis |
| 1/19/2016 |
Document, Report, or Work plan Review - other |
Reviewed the October 2015 Groundwater Monitoring Report, dated January 13, 2016. Five groundwater monitoring wells (MW-UH-01, MW-UH-02, MW-UH-04, MW-ON-01, and MW-ON-02) were sampled on October 28, 2015. Monitoring Well MW-UH-01, which is the most contaminated well, exhibited a concentration of GRO at 280 mg/L, DRO at 2.4 mg/L, benzene at 46 mg/L, toluene at 65 mg/L, ethylbenzene at 5.6 mg/L, and xylenes at 27 mg/L; all of which exceed the ADEC groundwater cleanup levels outlined in 18 AAC 75.345, Table C. Groundwater flow direction continues to be south-southwest.
The groundwater samples collected during this event were also submitted for laboratory analysis of sulfate to determine if the gypsum amendment (applied in June 2015) was present in any of the downgradient monitoring wells. Sulfate was only present in one up-gradient monitoring well (MW-UH-02), which is thought to be from a natural source.
|
Joshua Barsis |
| 8/22/2016 |
Document, Report, or Work plan Review - other |
Reviewed the report entitled U-Haul Facility No. 826052 June 2016 Groundwater Monitoring, dated August 22, 2016 for the U-Haul of Alaska site. Five groundwater monitoring wells (MW-UH-01, MW-UH-02, MW-UH-04, MW-ON-01, and MW-ON-02) were sampled on June 20, 2016. Monitoring Well MW-UH-01, which is the most contaminated well, exhibited a concentration of GRO at 186 mg/L, DRO at 4.80 mg/L, benzene at 38.4 mg/L, and toluene at 53.8 mg/L; all of which exceed the ADEC groundwater cleanup levels outlined in 18 AAC 75.345, Table C. Groundwater flow direction continues to be south-southwest.
The groundwater samples collected during this event were also submitted for laboratory analysis of sulfate to determine if the gypsum amendment (applied in June 2015) was present in any of the downgradient monitoring wells. Sulfate was present in all but two of the wells (MW-UH-04 and MW-ON-02). Generally, sulfate increased during this sampling event.
|
Joshua Barsis |
| 9/14/2016 |
Document, Report, or Work plan Review - other |
Reviewed the revised final report entitled U-Haul Facility No. 826052 June 2016 Groundwater Monitoring, dated September 14, 2016. Revised report included historical tables and small corrections. |
Joshua Barsis |
| 2/1/2017 |
Document, Report, or Work plan Review - other |
Reviewed the report titled U-Haul Facility No. 826052 October 2016 Groundwater Monitoring, dated January 25, 2017. Five groundwater monitoring wells (MW-UH-01, MW-UH-02, MW-UH-04, MW-ON-01, and MW-ON-02) were sampled on October 10, 2016. Additionally, a newly installed well (MW-QL-5) associated with the site adjacent to the north (Alaska Qwik Lube), was sampled on October 25, 2016.
Monitoring Well MW-UH-01, which is historically the most contaminated well, exhibited a concentration of GRO at 255,000 µg/l, DRO at 3,270 µg/l, benzene at 44,500 µg/l, toluene at 68,500 µg/l, ethylbenzene at 5,280 µg/l, xylenes at 26,400 µg/l, 1,2,4-trimethylbenzene at 1,120 µg/l, and 1,3,5-dichloroethane at 390 µg/l; all of which exceed the ADEC groundwater cleanup levels outlined in 18 AAC 75.345, Table C.
In addition to the results above, one of the samples collected from the wells on the Onnuri Church property (Well MW-ON-01) exhibited a level of tetrachloroethylene (PCE) at 43.5 µg/l, which slightly exceeds the Table C groundwater cleanup level of 41 µg/l. Trichloroethylene (TCE) was also present (at 0.41 µg/l), but was below the groundwater cleanup level of 2.8 µg/l. PCE and TCE have not historically been detected in this well, nor in any of the other wells associated with this site. Several of the other wells had detections of PCE below the Table C groundwater cleanup levels.
All groundwater samples collected during this event were submitted for laboratory analysis of sulfate (excluding MW-QL-5) to determine if the gypsum amendment that was applied in June 2015 was present in any of the downgradient monitoring wells. Sulfate was present in all of the wells between 605 µg/l and 41,200 µg/l. Groundwater flow direction continues to be south-southwest.
It appears that PCE, previously stable in the soil, may have been mobilized and dissolved into the groundwater by the addition of water injected into the gypsum trench, which was initially indented to mobilize the gypsum amendments. ADEC recommended discontinuing the injection of water into the gypsum trench at this time, to stop further mobilization of chlorinated solvents. Groundwater monitoring is ongoing at this site.
|
Joshua Barsis |
| 2/2/2017 |
Meeting or Teleconference Held |
ADEC met with U-Haul's consultant on February 2, 2017 to discuss ADECs concerns as they pertain to the source of PCE contamination in soil and groundwater; the application of water to the gypsum trench, which may have inadvertently mobilized PCE NAPL in the soil and dissolved into groundwater; vapor intrusion implications; and further delineation.
The meeting was informational and established the following: (1) PCE is present in the soils at this site, in the soils up-gradient of this site, and likely in soils surrounding this site stemming from various possible source areas; (2) PCE was not previously encountered in groundwater above Table C cleanup levels at this site, nor at the surrounding sites; and (3) The best course of action at this time is to stop injecting water into the gypsum trench and continue monitoring the wells as already approved.
|
Joshua Barsis |
| 6/29/2017 |
Document, Report, or Work plan Review - other |
Reviewed the report titled U-Haul Facility No. 826052 April 2017 Groundwater Monitoring, dated June 19, 2017. Five U-Haul groundwater monitoring wells (MW-UH-01, MW-UH-02, MW-UH-04, MW-ON-01, and MW-ON-02) and one newly installed well (MW-QL-5) associated with the site adjacent to the north (Alaska Qwik Lube) were sampled on April 11, 2017.
The sample collected from Monitoring Well MW-UH-01, which is historically the most contaminated well, exhibited a concentration of GRO at 191,000 µg/l, DRO at 2,320 µg/l, benzene at 38,700 µg/l, toluene at 57,500 µg/l, ethylbenzene at 5,570 µg/l, xylenes at 28,600 µg/l, 1,2,4-trimethylbenzene at 1,190 µg/l, 1,3,5-dichloroethane at 320 µg/l, and naphthalene at 435 µg/l; all of which exceed the ADEC groundwater cleanup levels outlined in 18 AAC 75.345, Table C. Several other compounds were listed as not-detected (ND), including tetrachloroethylene (PCE) and trichloroethylene (TCE), however the method detection limit (MDL) exceeded applicable cleanup criteria, and thus it is not possible for to know if these compounds are present above the cleanup level or not.
In addition to the results above, one of the samples collected from the wells on the Onnuri Church property (Well MW-ON-01) exhibited a level of PCE at 44.2 µg/l, which slightly exceeds the Table C groundwater cleanup level of 41 µg/l. TCE was not detected during this effort above the groundwater cleanup level. PCE has present in this well during the October 2016 event at 43.5 µg/l. Well MW-UH-04 exhibited a concentration of PCE at 4.38 µg/l, nearly an order of magnitude below the cleanup level.
All groundwater samples collected during this event were submitted for laboratory analysis of sulfate (excluding MW-QL-5) to determine if the gypsum amendment that was applied in June 2015 was present in any of the downgradient monitoring wells. Sulfate was present only in Wells MW-UH-02, MW-ON-01, and MW-ON-02 at 55,200 µg/l, 185 µg/l, and 3,430 µg/l, respectively. Groundwater flow direction continues to be south-southwest.
Conclusions in the report indicate that offsite chlorinated solvent releases are impacting the U-Haul property. ADEC concurs with this assumption, however it should also be noted that the upgradient contaminated soil and groundwater does not exceed the most stringent ADEC cleanup levels for PCE or TCE. The PCE in Well MW-ON-01 is likely the result of the additional water added to mobilize the gypsum.
Recommendations in the report include continued monitoring for VOCs on a semi-annual basis, to include GRO and DRO annually only. The next groundwater monitoring report (for October) should be submitted electronically no later than January 30, 2018.
ADECs response requested additional information on the church sumps. |
Joshua Barsis |
| 8/23/2017 |
Document, Report, or Work plan Review - other |
Reviewed the report titled U-Haul Facility No. 826052 April 2017 Groundwater Monitoring, dated August 9, 2017. This is a revised report of the June 19 version, submitted based on ADEC comment letter dated June 29, 2017. |
Joshua Barsis |
| 1/10/2018 |
Document, Report, or Work plan Review - other |
Reviewed the report entitled U-Haul Facility No. 826052 October 2017 Groundwater Monitoring, dated January 8, 2018 for the U-Haul of Alaska site. Five groundwater monitoring wells (MW-UH-01, MW-UH-02, MW-UH-04, MW-ON-01, and MW-ON-02) were sampled on October 10, 2017. Samples were submitted for laboratory analysis of select volatile organic compounds (VOCs). Monitoring Well MW-UH-01, which is the most contaminated well, exhibited a concentration of benzene at 236 micrograms per liter (µg/l), ethylbenzene at 33 µg/l, xylenes at 279 µg/l, and 1,2,4-trimethylbenzene at 28.2 µg/l; all of which exceed the ADEC groundwater cleanup levels outlined in 18 AAC 75.345, Table C. Results from Well MW-UH-01 were substantially reduced compared to the results from the April 2017 event. Groundwater flow direction continues to be south-southwest. This report is approved.
It was noted in the report that the reduction in results was likely because of water infiltrating through the well cap and accumulating in the well. However, proper purging of the well should mitigate any accumulation of water. Similarly to MW-UH-01, the results from Well MW-ON-01 were also substantially lower. |
Joshua Barsis |
| 9/5/2018 |
Document, Report, or Work plan Review - other |
Reviewed the report entitled U-Haul Facility No. 826052 June 2018 Groundwater Monitoring, dated August 21, 2018 for the U-Haul of Alaska site. Five groundwater monitoring wells (MW-UH-01, MW-UH-02, MW-UH-04, MW-ON-01, and MW-ON-02) were sampled on June 13, 2018. Samples were submitted for laboratory analysis of gasoline range organics (GRO), diesel range organics (DRO), select volatile organic compounds (VOCs), and sulfate. Monitoring Well MW-UH-01, which is the most contaminated well, exhibited a concentration of GRO at 156 milligrams per liter (mg/l), DRO at 3.84 mg/l, benzene at 37,100 micrograms per liter (µg/l), toluene at 35,600 µg/l, ethylbenzene at 2,990 µg/l, xylenes at 13,900 µg/l, 1,2-dichloroethane at 22 µg/l, naphthalene at 10.9 µg/l, 1,2,4-trimethylbenzene at 543 µg/l and 1,3,5-trimethylbenzene at 151 µg/l; all of which exceed the ADEC groundwater cleanup levels outlined in 18 AAC 75.345, Table C. Groundwater flow direction continues to be south-southwest. |
Joshua Barsis |
| 1/11/2019 |
Document, Report, or Work plan Review - other |
Reviewed the report entitled U-Haul Facility No. 826052 October 2018 Groundwater Monitoring, dated December 11, 2018 for the U-Haul of Alaska site. Five groundwater monitoring wells (MW-UH-01, MW-UH-02, MW-UH-04, MW-ON-01, and MW-ON-02) were sampled in October of 2018. Samples were submitted for laboratory analysis of select volatile organic compounds (VOCs). Additionally, the samples collected from Wells MW-UH-01 and MW-UH-04 were analyzed for gasoline range organics (GRO) and diesel range organics (DRO).
Monitoring Well MW-UH-01, which continues to be the most contaminated well, exhibited a concentration of GRO at 213 milligrams per liter (mg/l), DRO at 3.13 mg/l, benzene at 36,900 micrograms per liter (µg/l), toluene at 50,000 µg/l, ethylbenzene at 5,250 µg/l, xylenes at 24,700 µg/l, 1,2-dichloroethane at 24 µg/l, naphthalene at 164 µg/l, 1,2,4-trimethylbenzene at 1,170 µg/l and 1,3,5-trimethylbenzene at 290 µg/l; all of which exceed the ADEC groundwater cleanup levels outlined in 18 AAC 75.345, Table C. Groundwater flow direction continues to be south-southwest.
ADEC requested a work plan for corrective action by March 1, 2019; in addition to the ongoing GWM. |
Joshua Barsis |
| 10/17/2019 |
Document, Report, or Work plan Review - other |
Reviewed the 2019 and 2020 Groundwater Monitoring Work Plan, dated October 2019 for the U-Haul site. The proposed plan consists of sampling MW-UH-01 annually and two off property wells (MW-ON-01 and -02) biennially. |
Joshua Barsis |
| 12/20/2019 |
Document, Report, or Work plan Review - other |
Reviewed the October 2019 Groundwater Monitoring, dated December 17, 2019. One groundwater sample was collected from monitoring well (MW-UH-01) on October 24, 2019. The sample was analyzed for volatile organic compounds (VOCs), diesel range organics (DRO), and gasoline range organics (GRO). Analytical results were similar to prior year results. ADEC agreed with the report recommendations for follow-on sampling in 2020, well maintenance and decommissioning. |
Joshua Barsis |
| 1/29/2021 |
Site Characterization Report Approved |
The annual ground water monitoring report was submitted. Wells were sampled for DRO, GRO, and VOC.
Decommissioned: MW1, MW4, and MW5
Maintenance on MW-UH-01, MW-ON-01, MW-ON-02, MW-UH-04, MW-UH-02, MW3
Sampled: MW-UH-01, MW-ON-01, MW-ON-02
All contaminants detected in MW-ON-01 and MW-ON-02 were below cleanup levels. PCE was detected in both of these wells, below cleanup levels. The DRO concentration in MW-ON-02 increased significantly from previous results, but was still below cleanup levels.
MW-UH-01, nearest the source area, had concentrations of DRO, GRO, BTEX, 1,2-dichloroethane, 1,2,4-trimethylbenzene, and 1,3,5-trimethylbenzene exceeding cleanup levels. |
Lisa Krebs-Barsis |
| 6/11/2021 |
Site Characterization Workplan Approved |
The Anchorage UHaul 2021-2022 Groundwater Monitoring Work Plan, received on May 24, 2021, is conditionally approved. The condition is to ensure that the CSM shows that the ingestion to groundwater pathway is complete. In 2021 MW-UH-01 will be sampled and analyzed for GRO, DRO, and VOC. MW-ON-02 will be sampled and analyzed for DRO. In 2022 MW-UH-01, MW-ON-01, and MW-ON-02 will be sampled and analyzed for GRO, DRO, and VOC. |
Lisa Krebs-Barsis |
| 12/27/2021 |
Site Characterization Report Approved |
On 22 September 2021, MW-UH-01 and MW-ON-02 were sampled. At MW-UH-01 DRO (6.32 mg/L), GRO (25.4 mg/L), BTEX, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, and 1,2-dicholoroethene exceeded cleanup levels.
Mann Kendall Analysis of MW-UH-01 identified a decreasing trend for benzene and toluene and no trend for other analytes.
MW-UH-01 and MW-ON-02 and seven monitoring wells that were not sampled (MW-UH-02, MW-UH-03 MW-UH-04, MW-02, MW-03, MW-QL5,and MW-ON-01) were checked for depth to groundwater and presence of free product. No free product was observed in any wells.
Repairs were made to MW-UH-02 and MW-UH-03.
Recommended sampling of MW-UH-01 for PAH in 2022 or next work plan. |
Lisa Krebs-Barsis |
| 12/5/2022 |
Site Visit |
The ADEC performed a site visit this date to inspect site conditions and speak with consultant regarding remediation challenges. The ADEC attempted to make contact with southern property neighbor to inquire about any odors or vapor intrusion issues, but the property owner was not present at the time. |
Flannery Ballard |
| 10/16/2023 |
Site Characterization Report Approved |
On 5 October 2022, MW-UH-01, MW-ON-01, and MW-ON-02 were sampled. Samples collected from MW-UH-01 were analyzed for DRO, GRO, VOC, and PAH. Samples collected from MW-ON-01 and MW-ON-02 were analyzed for GRO, DRO, and VOC. At MW-UH-01 DRO (8.77 mg/L), GRO (18.5 mg/L), benzene (23,100 µg/L), ethylbenzene (5,240 µg/L), 1,2,4-trimethylbenzene (1,590 µg/L), 1,3,5-trimethylbenzene (458 µg/L), naphthalene (99.4 µg/L), 36.7) toluene (27,500 µg/L), and total xylenes (23,500 µg/L) exceeded cleanup levels. At MW-ON-01 benzene (99.4 µg/L), ethylbenzene (21.2 µg/L), vinyl chloride (0.230 µg/L) exceeded cleanup levels. At MW-ON-02 there were no exceedances. Groundwater flow direction was calculated to the southwest.
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Lisa Krebs-Barsis |
| 10/16/2023 |
Site Characterization Workplan Approved |
A workplan for groundwater sampling in 2023 and 2024 was approved. The plan proposes collecting groundwater measurements and sampling of MW-ON-01, MW-ON-02, MW-UH-01 for GRO, DRO, and VOC in 2023. In 2024 groundwater measurements will be collected. It is noted that the 2023 sampling event is complete. |
Lisa Krebs-Barsis |
| 10/16/2023 |
Document, Report, or Work plan Review - other |
The drilling work plan was approved after-the-fact. Work proposed in the plan was to advance ten soil borings in the former UST excavation and south near the property boundary. One soil boring was proposed northeast of the UST excavation. The field work was completed before completion of the report review. |
Lisa Krebs-Barsis |
