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Site Report: AFSC Former Cross-town Pipeline, Arctic & Tudor release

Site Name: AFSC Former Cross-town Pipeline, Arctic & Tudor release
Address: 4100 Arctic Boulevard, NW Corner Tudor & Arctic, Anchorage, AK 99503
File Number: 2100.38.438
Hazard ID: 2018
Status: Active
Staff: Shawn Tisdell, 9074512752 shawn.tisdell@alaska.gov
Latitude: 61.181667
Longitude: -149.896111
Horizontal Datum:

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

During the investigation of a leaking underground storage tanks at the Texaco station on the corner of Tudor and Arctic, Jet A was identified. An investigation in May 2000 found that the jet A pipeline that operated from 1962 to 1999 had leaked from a faulty weld. Product has migrated 150 feet to the east, 145 feet to the southwest, and 160 feet to the northwest of the leak point (northwest corner of Arctic and Tudor intersection). This includes the southeast corner of the Idle Wheels Mobile (Home) Court. An additional product recovery well was installed on September 2002, also two in 2003, and two more in 2005. Through September 2010, 13,600 gallons of product have been recovered, and up to 1.38 feet of product remain in several monitoring wells.

Action Information

Action Date Action Description DEC Staff
5/1/1989 Leaking Underground Storage Tank Corrective Action Underway A release of 3,000 gallons of gasoline was discovered and corrective action was employed by Storage Tank Program at nearby Texaco gas station. Robert Weimer
4/8/1994 Update or Other Action Date that free product was first observed in monitoring wells (product later disappeared and reappeared in wells). Eileen Olson
12/8/1999 Update or Other Action Geo Engineers report summarizing groundwater monitoring from the wells installed by Texaco (Equiva) that identify the free product as jet fuel originating from a source other than the gas station. Jim Frechione
12/30/1999 Site Added to Database Jet fuel product floating on the groundwater identified at the intersection of Arctic and Tudor. The source is the former AFSC Cross-Town Pipeline. The pipeline stopped operation in 1999. Jim Frechione
5/26/2000 Site Characterization Workplan Approved Plan approval letter sent for characterization of soils associated with an approximately 500 foot length of pipe which will be removed in 50 foot sections. Consultants for both Signature and Texaco will be observing the excavation and screening and sampling soils. Eileen Olson
5/30/2000 Site Visit Staff visited the site on 5/27/00 and 5/28/00 during removal of 500 feet of pipeline. Contamination was evident in one area where a concrete electronics utilador crosses over the pipeline, on Arctic, just north of the Tudor intersection. Eileen Olson
6/22/2000 Meeting or Teleconference Held Teleconference with Tom Mushovic and Laurie Butler of Signature attended by ADEC representatives Jim Frechione and Eileen Olson. Mushovic informed staff that Signature is taking responsibility for investigation and cleanup of contamination following discovery of a crack in the pipe removed during work on 5/27-28, 2000. Eileen Olson
8/2/2000 Update or Other Action Signature notified ADEC that consultant is preparing work plan and expects to submit plan within two weeks. Eileen Olson
8/3/2000 Update or Other Action Following media contact by local TV station, staff contacted Signature and received updates from Signature's Environmental Manager and attorney. Staff prepared a briefing for Department Public Information Officer. In the afternoon, local TV news covered contamination at the site as the top news story. Channel 2 write-up is in the file. Eileen Olson
8/4/2000 Update or Other Action Robert Weimer of the STP and CSRP staff provided interviews to the Anchorage Daily News. Resulting article dated 8/5/00 is in the file. Eileen Olson
9/13/2000 Update or Other Action Received anonymous information via Coast Guard that alleges AFSC knew of pipeline leakage at this site 10 years ago. Sent follow-up letter to AFSC requesting clarification of documents provided, and a written explanation of leak testing history. Eileen Olson
9/19/2000 Update or Other Action Received response to information request letter sent to AFSC on 9/13/00. Eileen Olson
9/20/2000 Site Characterization Workplan Approved Approved plan to install 11 new monitoring wells and a free product recovery well; sample 11 existing wells; and test and initiate free product recovery. Eileen Olson
10/16/2000 Update or Other Action Site visit during monitoring well drilling and installation. First day of up to two weeks of work to further characterize soil and groundwater contamination, and install a free product recovery well. Eileen Olson
10/17/2000 Site Ranked Using the AHRM Reranked: Changed Toxicity Value from unknown to 2, as contaminant is JetA fuel. Eileen Olson
10/17/2000 Update or Other Action Media contact (Ch. 2 TV) regarding site status and asking for an explanation of the difference between AFSC's estimate of the quantity of fuel released to the environment, and DEC's (respectively, 7,600 gallons vs. 40,000-80,000 gallons). Explanation given was that two separate methods of estimating volume were used; first, an estimate was made based on free product in monitoring wells. The lower (and later) estimate was made based on the leak rate measured during testing of the flawed piece of pipe. An on-camera interview with consultant was aired the following day. Eileen Olson
11/15/2000 Update or Other Action Letter out providing information requested in an October 20, 2000 letter from mobile home park owner adjacent to release area. Eileen Olson
12/7/2000 Meeting or Teleconference Held Staff attended a meeting between AFSC and Gary Baugh, owner of a mobile home park adjacent to the pipeline release site, and their respective legal counsel. The purpose of the meeting was to finalize an access agreement which allows AFSC to install and operate a free product recovery system and monitoring wells on Baugh's property. The term of the agreement is nine months and may be extended. Access was a sticking point that delayed additional characterization groundwater contamination, and testing to determine the best method for free product recovery. Work is expected to begin within the next week. Eileen Olson
2/21/2001 Document, Report, or Work plan Review - other Approved plan to do a baildown test of monitoring well MW31 by Voom Engineers. Letter to AFSC requesting area groundwater monitoring and measurement of free product to be done by March 9, 2001. Eileen Olson
2/23/2001 Update or Other Action Received call from Signature asking whether ADEC had previously requested quarterly monitoring, and whether Texaco had been monitoring quarterly before monitoring wells were transferred to Signature. In checking whether Texaco had monitored quarterly, it was discovered that Texaco had continued quarterly monitoring of what are now Signature's wells through December 2000 and had intended to continue quarterly monitoring in March 2001. Eileen Olson
3/28/2001 Update or Other Action ADEC letter out requesting immediate initiation of minimum 3x weekly product recovery for one hour in MW-31. Eileen Olson
3/29/2001 Update or Other Action AFSC's consultant reported that MW-31 had been pumped on same date, recovering approximately 15 gallons using a Grundfos pump. Eileen Olson
4/18/2001 Update or Other Action Received faxed groundwater analytical results for March 2001 sampling, also update on drilling recovery well and additional monitoring wells, expect completion April 19th. Well development and sampling to be complete April 19th and 20th. Eileen Olson
9/15/2001 Update or Other Action AFSC contractor installed product recovery system and tested vacuum-enhanced skimming. Robert Weimer
2/15/2002 Update or Other Action Six additional monitoring wells installed to help define extent of product and dissolved contamination. Robert Weimer
4/9/2002 Site Ranked Using the AHRM Reranked site. Changed Quantity from 3 to 4. Robert Weimer
6/13/2002 Update or Other Action ADEC receives site correspondence from ASIG (Aircraft Service International Group) as a name change from AFSC (Anchorage Fueling and Service Company) they both have the same contact people, mailing address, and PO Box. ASIG will be used on all future correspondence instead of AFSC. Robert Weimer
7/15/2002 Update or Other Action Two additional monitoring wells installed on Idle Wheels property to help define the extent of product and dissolved contamination. Robert Weimer
9/15/2002 Update or Other Action An additional product recovery well (RW-3) installed. 5500 gallons of product recovered to date. Robert Weimer
12/4/2002 GIS Position Updated Plotted coordinates and verified their relative accuracy. Former Staff
12/16/2002 Update or Other Action Receive November 2002 Site Characterization Report. Robert Weimer
2/6/2003 Document, Report, or Work plan Review - other ADEC approves reduction in groundwater monitoring in some of the monitoring wells. Robert Weimer
2/11/2003 Cleanup Plan Approved ASIG's consultant submits a proposal to install two additional VES product recovery wells to bring the total to 4. ASIG proposes to try to use some of the existing monitoring wells to recover the product that had migrated into those areas, with the understanding that additional larger product recovery wells would be required if the existing product recovery wells were not effective in recovering product from that area of the site. Robert Weimer
4/18/2003 Update or Other Action Received notice that .93 feet of free-product has migrated to MW-116. Robert Weimer
8/1/2003 Preliminary Assessment Approved E&E evaluated migration of diesel vapors into indoor air at trailer park and found pathway to be incomplete based on 3 tier evaluation. Robert Weimer
1/12/2004 Document, Report, or Work plan Review - other ADEC approves reduction of groundwater monitoring to semi-annual at the site. Robert Weimer
6/24/2004 Update or Other Action April 2004 groundwater monitoring and product recovery report. A total of 9,330 gallons of free product have been recovered as of 6/18/04. RW-4 is recovering 7.3 gallons per day. Up to 2.35 feet of product in monitoring well MW-115. Up to 2.5 feet of product on recovery wells RW-3 and MW-120. Up to 26 mg/l DRO in monitoring well MW-122. Up to 11.4 ug/l benzene in monitoring well MW-125. Dissolved contamination concentrations appear to be increasing in some of the monitoring wells. Robert Weimer
11/2/2004 Update or Other Action DOTPF plans to do some trenching and excavation work near the pipeline release point later this year as part of putting in a new light pole and utilities. Potential for encountering contaminated soil as part of the work. DOTPF is coordinating with ASIG. Robert Weimer
11/3/2004 Update or Other Action Formerly CS92.30 File number issued: 2100.38.438 Aggie Blandford
5/11/2005 Site Visit Site visit to discuss future site work, including intersection work and the hook up of two additional product recovery wells. Robert Weimer
6/1/2005 Document, Report, or Work plan Review - other The free product recovery system was upgraded in June 2005. Monitoring wells MW-31, MW-115, and MW-116 were converted into recovery wells to help recover product found in those areas. Recovery well RW-3 was discontinued in June 2005 because of close proximity to recovery well RW-120 and RW-115. ASIG proposes to try to use some of the existing monitoring wells to recover the product that had migrated into those areas, with the understanding that additional larger product recovery wells would be required if the existing product recovery wells were not effective in recovering product from that area of the site. Robert Weimer
6/23/2005 Update or Other Action April 2005 groundwater monitoring and product recovery report. A total of 11,048 gallons of free product have been recovered as of 5/13/05. The average recovery is 5.9 gallons per day. Outside of the product recovery wells up to 1.42 feet of product in monitoring well MW-116. Up to 24.6 mg/l DRO in monitoring well MW-125. Up to 32 ug/l benzene in monitoring well MW-125. Dissolved contamination concentrations appear to be increasing in some of the monitoring wells. Robert Weimer
12/12/2005 Update or Other Action October 2005 groundwater monitoring and product recovery report. A total of 11,580 gallons of free product have been recovered as of 11/2/05. The average recovery is 3.0 gallons per day. Outside of the product recovery wells up to 0.8 feet of product in monitoring well MW-111(the previous events thicker product monitoring well, MW-116, was converted to a product recovery well in June 2005). Up to 17.7 mg/l DRO in monitoring well MW-125. Up to 32 ug/l benzene in monitoring well MW-125 (on 4/6/05). Dissolved contamination concentrations appear to be increasing in some of the monitoring wells. Depth to groundwater is 29 to 33 feet below ground surface. Groundwater generally flows to the northwest. Robert Weimer
1/31/2006 Update or Other Action Discussed with property owner and ASIG a request to shut down product recovery system until April due to lower recovery (1 gallon/day), cold weather, and access to do equipment maintenance. System is to be shutdown on 2/2/06 until the spring of 2006. Robert Weimer
8/28/2006 Update or Other Action April 2006 groundwater monitoring and product recovery report. A total of 12,293 gallons of free product have been recovered as of 5/25/06. Outside of the product recovery wells up to 5.05 feet of product in monitoring well MW-21. Up to 8.52 mg/l DRO in monitoring well MW-108. Up to 8.9 ug/l benzene in monitoring well MW-125 (on 4/28/06). Dissolved contamination concentrations appear to be increasing in some of the monitoring wells. Depth to groundwater is 30 to 36 feet below ground surface. Groundwater generally flows to the north by northwest. E&E recommends adding MW-102 and MW-22 to the fall sampling event. Robert Weimer
12/6/2006 Update or Other Action September 2006 groundwater monitoring and product recovery report. A total of 12,293 gallons of free product have been recovered as of 5/25/06. Outside of the product recovery wells up to 4.66 feet of product in monitoring well MW-21. Up to 9.25 mg/l DRO in monitoring well MW-125. Up to 17.9 ug/l benzene in monitoring well MW-125 (on 9/28/06). Dissolved contamination concentrations appear to be increasing in some of the monitoring wells. Depth to groundwater is 29 to 35 feet below ground surface. Groundwater generally flows to the north by northwest. Robert Weimer
2/5/2007 Exposure Tracking Model Ranking Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site. Robert Weimer
8/28/2007 Update or Other Action ADEC requests that a completed QA/QC checklist be included with all future monitoring reports. ADEC also requests information on the current status of the product recovery system, and total amount of product recovered. Robert Weimer
8/28/2007 Update or Other Action Approved request to decommision two damaged monitoring wells (MW-101 and MW-102) that are located in Arctic Road. They are to be replaced with at least one monitoring well in that area when road work on Arctic has been completed. Robert Weimer
8/28/2007 Update or Other Action April 2007 groundwater monitoring report. Outside of the product recovery wells up to 2.40 feet of product in monitoring well MW-21. Up to 8.29 mg/l DRO in monitoring well MW-125. Up to 11.7 ug/l benzene in monitoring well MW-125. Dissolved contamination concentrations appear to be decreasing in most of the monitoring wells. Depth to groundwater is 29 to 33 feet below ground surface. Groundwater generally flows to the north by northwest. Robert Weimer
8/29/2007 Update or Other Action ADEC receives an update from ASIG. System restarted in April 2007 and has recovered 13,073 gallons of product as of 8/27/07. The system has recovered 387 gallons since April 2007. Robert Weimer
1/4/2008 Update or Other Action ADEC receives notification that the entire product recovery system has been down since late December and will remain off-line until the spring due to a broken heater in the treatment shed. Robert Weimer
5/28/2008 Update or Other Action Review and approve plan to abandon damaged monitoring well MW-111. A replacement monitoring well may be required in the future. The spring groundwater sampling event is to be conducted in June or July 2008. Robert Weimer
5/28/2008 Update or Other Action October 2007 groundwater monitoring report. Outside of the product recovery wells up to 4.16 feet of product in monitoring well MW-21. Up to 26.4 mg/l DRO in monitoring well MW-10. Up to 1.91 mg/l GRO in monitoring well MW-10. Up to 13.9 ug/l benzene in monitoring well MW-125. Dissolved contamination concentrations appear to be increasing in most of the monitoring wells. Depth to groundwater is 30.29 to 35.35 feet below ground surface. Groundwater generally flows to the north by northwest. Seven monitoring wells were not sampled because they could not get a right-of-way permit during the day. Robert Weimer
10/29/2008 Update or Other Action ADEC receives notification that the product recovery system has been down since October 28, 2008 for repairs to the heating system, and that the product recovery system may be off-line until the spring. Robert Weimer
2/4/2009 Update or Other Action ADEC receives notification that the heater has been repaired and the product recovery system has been restarted. Robert Weimer
3/18/2009 Document, Report, or Work plan Review - other June 2008 groundwater monitoring event. Measurable product was found in 12 monitoring wells this event (7 of them are recovery wells). Outside of the product recovery wells up to 0.81 feet of product in monitoring well MW-103. Up to 7.66 mg/l DRO in monitoring well MW-125. Up to 0.508 mg/l GRO in monitoring well MW-4. Up to 15.9 ug/l benzene in monitoring well MW-125. Contamination concentrations increased in 4 of the 6 monitoring wells with detectable dissolved contamination. Higher dissolved concentrations of benzene, GRO, and DRO probably exist at the site because some former product wells such as MW-10 are not currently being sampled for dissolved contamination. Depth to groundwater is 30.08 to 32.73 feet below ground surface. Groundwater generally flows to the north by northwest. Robert Weimer
3/18/2009 Update or Other Action ADEC requests that the RP have their consultant evaluate other product recovery technologies (such as rope/belt skimmers) that may be more cost effective than their current system. Robert Weimer
3/19/2009 Document, Report, or Work plan Review - other September 2008 groundwater monitoring event. Measurable product was found in 10 monitoring wells this event (7 of them are recovery wells). Outside of the product recovery wells up to 0.16 feet of product in monitoring well MW-103. Up to 9.37 mg/l DRO in monitoring well MW-125. Up to 0.685 mg/l GRO in monitoring well MW-122. Up to 13.0 ug/l benzene in monitoring well MW-125. Contamination concentrations increased in 6 of the 7 monitoring wells with detectable dissolved contamination. Higher dissolved concentrations of benzene, GRO, and DRO probably exist at the site because some former product wells such as MW-10 are not currently being sampled for dissolved contamination. Two of the sentinel monitoring wells (MW-119 and MW-123) had showed GRO contamination for the first time. Monitoring well MW-122 has its highest levels of GRO contamination since 2005. Depth to groundwater is 29.02 to 32.52 feet below ground surface. Groundwater generally flows to the north by northwest. Between 6/2/08 and 8/14/08 124 gallons of product was recovered (1.68 gallons per day). Between 10/2/01 and 8/14/08 at total of 12,617 gallons of product have been recovered. Groundwater has risen 3 to 4 feet in the monitoring wells since 2001. Robert Weimer
4/2/2009 Meeting or Teleconference Held Talked with Amber at ASIG about the proposed product baildown test and groundwater monitoring at the site. ASIG will have their consultant measure the current product levels in all of the recovery wells and provide that information to ADEC along with recommendations on which wells to conduct the baildown test on. ADEC will then review the baildown test work plan. ADEC noted that ASIG had not been providing product thickness readings for all of the recovery wells. Amber said they would be providing all of the product measurement data in the future. We discussed that the dissolved concentrations have increased during the last two monitoring events, and contamination has showed up in two of the sentinel monitoring wells (MW-119 & MW-123) during the last monitoring event. We also discussed that there still is an active drinking water well about 600 feet downgradient of the product (4303 Cope Street) and another active drinking water well about 600 feet cross gradient (4201 Arctic Blvd). ASIG and their consultant plan to have a meeting with ADEC early May to discuss the results of the baildown testing and to discuss future groundwater monitoring at this site. Robert Weimer
4/15/2009 Meeting or Teleconference Held Meeting between ADEC, ASIG, and ASIG's consultant Oasis. We discussed groundwater monitoring and product recovery. ASIG would like to abandon all of the monitoring wells in the roadway, suspend sampling in 9 other monitoring wells, and reduce monitoring to annual in all other monitoring wells. ASIG also provided site cost information, and product recovery amounts for 2001 through 2009. ASIG provided product measurement data from 4/13/09. A total of 12,479 gallons of product have been recovered by the system, and an additional 1,150 gallons of product was recovered prior to the recovery system installation. ADEC was informed in the meeting on that ASIG is currently only recovering product from 2 of the 8 recovery wells (RW1 and RW4). It appears that ASIG suspended recovering product in recovery wells RW31, RW115, RW116, and RW120 back in 2005 without notifying ADEC or obtaining the necessary approval from ADEC (as required in 18 AAC 75.360) to suspend product recovery in those wells. ASIG stated that they were having trouble with the 1.5 inch skimmer pumps in those 2 inch recovery wells. In the meeting ADEC stated that they would be sending out a letter to ASIG requesting a plan to recover the product in those areas which could include the installation and operation of larger recovery wells and/or using an alternative effective product recovery technology in the existing 2 inch wells. Oasis is to contact AWWU and the resident of 4303 Cope Street to confirm the status of the water well previously identified at that property. Oasis is to provide a report of their findings, and ADEC will review the findings and provide a response to ASIG's request to reduce the groundwater monitoring and abandon monitoring wells in the roadway for the Arctic and Tudor site. ASIG is also requesting that ADEC provide a written decision as to what standard will be used (such as product thickness in wells) to determine when the product recovery can suspended at this site. We discussed that the ADEC Guidance for Cleanup of Petroleum Contaminated Sites lists 1 inch (0.08 feet) of product as the standard. Robert Weimer
4/15/2009 Document, Report, or Work plan Review - other On 4/13/09, 7 of the 8 recovery wells were checked for product levels. Up to 0.60 feet of product in RW116, 0.30 feet of product in RW115 and RW1, 0.25 feet of product in RW4, 0.10 feet of product in RW120, and no product in RW3. Recovery well RW2 had 0.16 feet of product measured on 9/29/08. ADEC was informed in a meeting on 4/15/09 that ASIG is currently only recovering product from 2 of the 8 recovery wells (RW1 and RW4). It appears that ASIG suspended recovering product in recovery wells RW31, RW115, RW116, and RW120 back in 2005 without notifying ADEC or obtaining the necessary approval from ADEC (as required in 18 AAC 75.360) to suspend product recovery in those wells. ASIG stated that they were having trouble with the 1.5 inch skimmer pumps in those 2 inch recovery wells. In the meeting ADEC stated that they would be sending out a letter to ASIG requesting a plan to recover the product in those areas which could include the installation and operation of larger recovery wells and/or using an alternative effective product recovery technology in the existing 2 inch wells. Robert Weimer
6/24/2009 Update or Other Action June 19, 2006 letter from ASIG provides information on the operation of the site product recovery wells. In 2005 skimming operations were initiated in all of the recovery wells. Converted 2 inch monitoring well recovery wells RW120, RW115, and RW31 only operated for one month and were shut off due to poor product recovery of the product in those wells. In 2006 skimmers and modified skimmers were installed in RW-31, RW-115, and RW-116, but did not recover the fuel in the monitoring well. In 2007 & 2008 skimmers were only operated in recovery wells RW1 and RW4 eventhough product remained in many of the other recovery wells (such as 0.46 feet of product in RW-116). Later in 2009 skimmers were installed in recovery wells RW1, RW4, RW115, and RW116. Despite recent weekly efforts to adjust and optimize the skimmers in the converted 2 inch monitoring well recovery wells Rw115 and RW116 not product has been recovered from those wells despite 0.30 feet of product in RW115 and 0.60 feet of product in RW116. The currently approved cleanup plan for product recovery calls for the operation of all 8 recovery wells at the site. At the April 15, 2009 meeting ADEC learned that only 2 (RW-1 and RW-4) of the 8 recovery wells were currently being operated at the site. ADEC had not been previously informed, or received any request for approval for a change in the product recovery system for this site. Under 18 AAC 75.360 a responsible person (in this case ASIG) shall submit and obtain approval prior to any modification of a cleanup or monitoring plan. ADEC understands the challenges in effectively recovering product from 2 inch monitoring wells that were never intended to be product recovery wells (RW31, RW115, RW116, and RW120), which is why the wells that were installed as product recovery wells (RW1, RW2, RW3, and RW4) were a larger 6 inch size (RW2 is a 4 inch size) with hydrophobic resin-coated silica sand or other material to enhance product recovery. It was ASIG who proposed to try to use some of the existing monitoring wells to recover the product that had migrated into those areas, with the understanding that additional larger product recovery wells would be required if the existing product recovery wells were not effective in recovering product from that area of the site. As we discussed in the April 15, 2009 meeting ASIG needs to operate an active product recovery system to address all product areas on the site, and if some of the existing product recovery wells are not being effective, then those wells need to be enhanced or replaced so that the product in those areas can be effectively recovered. Robert Weimer
6/25/2009 Document, Report, or Work plan Review - other ADEC review of the Mann-Kendall (M-K) statistical analysis conducted by ASIG's consultant for the diesel range organics (DRO) contamination in 4 of the site monitoring wells. This statistical analysis was responded to in the ADEC letter dated 7/7/09. Several ADEC staff have reviewed the statistical analysis provided and ADEC does not accept the concentration trend decision matrix proposed, and does not agree with the consultants conclusions that the plume is stable or decreasing in all 4 of those monitoring wells. The M-K statistic (S) provided actually indicates an increasing trend (a positive S value) in 2 (MW-4 and MW-125) of the 4 monitoring wells evaluated. As was discussed in the April 15, 2009 meeting, ADEC has concerns about the significant rise in groundwater elevations (change in site conditions), and increase in dissolved concentrations in the site monitoring wells over the last two monitoring events. The concentrations in the dissolved groundwater plume have increased over the most recent monitoring events. During the most recent groundwater monitoring event of September 2008, contamination concentrations increased in 6 of the 7 monitoring wells with dissolved contamination. For example the dissolved DRO concentration increased in monitoring well MW-122 from 2.48 mg/l to 6.41 mg/l over the last two monitoring events. Detectable gasoline range organics (GRO) contamination has shown up in sentinel monitoring well (MW-123) for the first time. Another sentinel monitoring well (MW-119), which lies in between the product and the active drinking water well at 4303 Cope Street, also showed detectable GRO contamination (0.11 mg/l) for the first time during the last monitoring event. The GRO detected in MW-119 was identified as a possible additive for jet fuel, isopropyl alcohol, which is very soluble in water and would be expected to move out in front of an expanding jet fuel plume. Unless further supporting evidence is provided, ADEC does not concur with your consultant’s suggestion that the source of the isopropyl alcohol GRO contamination in monitoring well MW-119 was from their failure to properly rinse their water level probe and not from the jet fuel. It appears that downgradient migration of product has continued at the site. Since the product recovery system began operation in 2001, product has migrated in the downgradient direction into monitoring well RW-116, which during the last product measuring event had the greatest thickness (0.60 feet) of measured product at the site. Between October 1, 2008 and April 13, 2009 product migrated an estimated 50 feet in the downgradient direction into the area of RW-115. Robert Weimer
6/25/2009 Document, Report, or Work plan Review - other ADEC review of June 19, 2009 Work Plan for Groundwater monitoring in 2009. This plan was responded to in the ADEC letter dated 7/7/09. The plan proposes suspending sampling in 9 monitoring wells, and reducing sampling to annual for the remaining monitoring wells except for one monitoring well MW-119 that is to be sampled on a semi-annual basis, and that the 6 monitoring wells located in the roadway be abandoned. ADEC concurs with suspending the sampling in several of the monitoring wells requested (107, 109, 118), but does not agree with their suggestion that the roadway monitoring wells do not provide useful data. As discussed in our meeting, it is important to monitor changes in product thickness and its mobility at the site, and when product is no longer found in a well it is important to monitor trends in dissolved contamination in those areas. We share your concerns about safety, which is why we are only requesting annual monitoring of those wells so the necessary data can be collected at a time and date when it can be done safely. In the interest of cost savings, we are approving the suspension of sampling in additional monitoring wells (8 and 30) beyond what was proposed by your consultant. Based on a review of the groundwater sampling data, changes in groundwater elevations/site conditions, and the presence of active drinking water wells in the area, ADEC feels that it is premature to reduce the monitoring to annual (with semi-annual in MW-119) in all of the monitoring wells at this site. ADEC approves the following modifications (until further notice) in groundwater sampling at this site: Suspend the sampling of monitoring wells 8, 30, 107, 109, and 118. Measure for product thickness in monitoring wells 7, 13, 21, 100, 103, 105, 112, 113, 117, and 124 on an annual basis (if there is no product or sheen in the well, then collect a water sample from that well and have it analyzed for BTEX, GRO, and DRO). Measure for product thickness in monitoring wells 4, 6, 10, 111, 114, 119, 122, 123, 125, 126, 127, RW1, RW2, RW3, RW4, RW31, RW115, RW116, and RW120 on an semi-annual basis (if there is no product or sheen in the well, then collect a water sample from that well and have it analyzed for BTEX, GRO, and DRO). ADEC is also requesting that the downgradient drinking water well located at 4303 Cope Street be sampled on a semi-annual basis for BTEX (EPA method 524.2), GRO, and DRO. Robert Weimer
6/25/2009 Document, Report, or Work plan Review - other ADEC review of June 19, 2009 Work Plan for Free-phase Petroleum Hydrocarbon Recovery. Comments on the proposed plan were included in ADEC's July 7, 2009 letter. The workplan proposes to use the existing vapor enhanced product recovery system, which is only effectively recovering product from 2 of the recovery wells (RW1 and RW4), and the entire system is to be permanently shut off when the product recovery during any 2 week period falls below 3 gallons a week, or by mid-October 2009 which ever happens first. The plan then proposes to only conduct product recovery by pumping by a vacuum truck at select wells once every two weeks to once every six months, with all vacuum truck pumping to end if for two consecutive 6 months periods all of the selected 8 former recovery wells contained less than 1 inch of measured product. This work plan is not approved because of the following concerns: (1) The plan proposes to continue to operate the existing vapor enhanced product recovery system which is only effectively recovering product from two wells. As discussed above the existing operation is not adequate and an upgraded system is required. (2) The plan proposes to shut down the vapor enhanced product recovery system permanently in mid-October 2009 regardless of the recovery rates and thickness of remaining product. The system building heater has been repaired and the system has operated during the winter in the past, so there is no reason of the system to be shut down in mid-October 2009. (3) The plan proposes to permanently shut down the system if it recovers less than 3 gallons in any 2 week period, even if recovery would be higher at a later date or higher with an upgraded system. As discussed above this is not acceptable. (4) The plan calls for using in the future only vacuum truck pumping at select wells on a two week to 6 month frequency. Pilot tests conducted at the site at this area (MW-31) showed that the product in the well recharged 74% within 5.3 hours after pumping stopped. Based on past pilot testing data a frequency twice daily pumping would seem to be more appropriate. Also based on past field testing the proposed vacuum truck pumping would have a much smaller radius of influence than vapor enhanced product recovery technology and probably would not be able to effectively recovery product under much of the roadway. (5) The plan proposes to use a standard for stopping all product recovery at the site if for two consecutive 6 months periods all of the selected 8 former recovery wells contained less than 1 inch of measured product. ADEC concurs with your consultant’s recommendation that 1 inch of product be used as the standard for product recovery, which is consistent with ADEC “Guidance for Cleanup of Petroleum Contaminated Sites”, but the 1 inch standard applies to all of the site wells, not just the selected 8 former recovery wells. Over the past year greater than 1 inch of measurable product has been identified in at least 4 monitoring wells in addition to the site recovery wells. Robert Weimer
6/25/2009 Document, Report, or Work plan Review - other May 6, 2009 report that the 0.11 mg/l GRO detected in monitoring well MW-119 was isopropyl alcohol and this was not due to the juel fuel leak. ADEC reviewed jet fuel information and found that isopropyl alcohol is a possible additive to jet fuel, and as it is very soluable in water it would be expected to be found ahead of an expanding jet fuel product plume. The report also noted that the table in their September 2008 sampling report was in error, GRO detected in monitoring well MW-122 is 0.0685 mg/l. Robert Weimer
6/29/2009 Update or Other Action May 12, 2009 sampling of the 4303 Cope Street active drinking water well. The sample was analyzed for VOC's (method 524.2), and SVOC's (method 525.2). All samples were non-detect during this monitoring event. The drinking water well at 4303 Cope Street is located about 600 feet downgradient from the remaining Jet Fuel product. Robert Weimer
7/7/2009 Update or Other Action ADEC letter dated July 7, 2009. The letter was a follow up to the April 15, 2009 meeting, the June 19, 2009 Groundwater sampling workplan, Free-phase petroleum hydrocarbon product recovery workplan, response to ASIG’s June 19, 2009 letter and recent submittals. Based on a review of the groundwater sampling data, changes in groundwater elevations/site conditions, and the presence of active drinking water wells in the area, ADEC determined that it is premature to reduce the monitoring to annual (with semi-annual in MW-119) in all of the monitoring wells at this site. ADEC approves the following modifications (until further notice) in groundwater sampling at this site: Suspend the sampling of monitoring wells 8, 30, 107, 109, and 118. Measure for product thickness in monitoring wells 7, 13, 21, 100, 103, 105, 112, 113, 117, and 124 on an annual basis (if there is no product or sheen in the well, then collect a water sample from that well and have it analyzed for BTEX, GRO, and DRO). Measure for product thickness in monitoring wells 4, 6, 10, 111, 114, 119, 122, 123, 125, 126, 127, RW1, RW2, RW3, RW4, RW31, RW115, RW116, and RW120 on an semi-annual basis (if there is no product or sheen in the well, then collect a water sample from that well and have it analyzed for BTEX, GRO, and DRO). ADEC is also requests that the downgradient drinking water well located at 4303 Cope Street be sampled on a semi-annual basis for BTEX (EPA method 524.2), GRO, and DRO. ADEC requests that if it has not already happened that the product recovery system is restarted by no later than July 15, 2009, and that the existing system continue to be operated, maintained, and monitored until an approved enhanced or replacement product recovery system begins operation. Based on a review of past pilot testing data, product recovery data, product recovery system operation data, and recent changes in groundwater elevations/site conditions ADEC requests that their consultant conduct an evaluation of the current product recovery system and submit a plan for the enhancement, modification, and/or replacement of the existing product recovery system (such as the installation of product recovery wells to replace the ineffective converted 2 inch monitoring wells), so that the remaining product at the site can be effectively recovered. ADEC request that the results of the evaluation and the plan be submitted by August 21, 2009. Robert Weimer
1/29/2010 Conceptual Site Model Submitted On January 12, 2010 and updated conceptual site model was submitted. It identified current and future potential exposure of ingestion of groundwater and inhalation of indoor air. The updated conceptual site model graphic form and report narrative did not include the incidential soil ingestion and dermal absorption of contaminats from soil and inhalation of outdoor air to construction (trench) workers. Soil contamination above cleanup levels has been identified within 15 feet of the ground surface at this site so those potential exposure routes should be included in the conceptual site model. Robert Weimer
1/29/2010 Document, Report, or Work plan Review - other The current recovery system that is operating in 2 of the 8 recovery wells was shut down on August 27, 2009 to conduct baildown testing in RW-31. On October 15, 2009 0.92 feet of product was measured in RW-31 with a small diameter bailer. Measured product thickness is biased low because it is measured using a bailer that has a smaller inflow diameter than the bailer diameter. The consultant identified problems with getting accurate product thickness measurements with a down-well interface probe. During the baildown testing conducted between October 15, 2009 and October 20, 2009 the natural non-enhanced recovery rate into the 2 inch monitoring well was between 0.026 and 0.002 gallon per day. The measured thickness of product in the monitoring well was 0.92 feet that exceeds the DEC 1 inch site wide standard to determine when free product recovery would no longer practicable at this site. During product measurements conducted at the site between August 27-29, 2009 product over 1 inch was identified in 8 monitoring wells at the site. Monitoring well MW-103 had up to 4.68 feet of product in it during this period, the greatest thickness of product ever measured in that monitoring well. Robert Weimer
1/29/2010 Document, Report, or Work plan Review - other August 2009 groundwater monitoring event. Measurable product was found in 8 monitoring wells this event (4 of them were recovery wells). Outside of the product recovery wells up to 4.68 feet of product in monitoring well MW-103. This is the greatest thickness of product ever measured in this monitoring well, and an increase of 4.55 feet of product thickness since September 2008. Up to 21.8 mg/l DRO in monitoring well MW-122. Up to 0.741 mg/l GRO in monitoring well MW-125. Up to 9.2 ug/l benzene in monitoring well MW-125. Contamination concentrations increased in 5 of the 10 monitoring wells with detectable dissolved contamination, and decreased or was stable in the other 5 monitoring wells with detectable dissolved contamination. Higher dissolved concentrations of benzene, GRO, and DRO probably exist at the site because some former product wells such as MW-10 are not currently being sampled for dissolved contamination. The sentinel monitoring well MW-8 has its highest levels of DRO contamination since 2005. Monitoring well MW-113 had it is highest levels of DRO contamination ever. Monitoring wells MW-122 & MW-127 had it is highest levels of DRO contamination since 2004. Depth to groundwater is 28.06 to 34.19 feet below ground surface. Groundwater generally flows to the north by northwest. Between 2/3/09 and 8/19/09 173 gallons of product was recovered (1.00 gallon per day). Between 10/2/01 and 8/19/09 at total of 12,790 gallons of product have been recovered. Groundwater has risen 3 to 4 feet in the monitoring wells since 2001. Nine monitoring wells and the drinking water well at 4303 Cope Street that had been requested in the DEC letter of 7/7/09 to be sampled for BTEX/GRO/DRO were not sampled. Robert Weimer
12/15/2010 Document, Report, or Work plan Review - other July 2010 groundwater monitoring event. The groundwater monitoring, product measurements, and product recovery were not in compliance with DEC’s letter of 7/7/09. Measurable product was found in 6 of the 19 monitoring wells checked this event. The thickness of the product increased in three of the monitoring wells checked. Up to 2.14 feet of product in recovery well RW-31, which is an increase of 1.67 feet of product since August 2009. Measured product thickness is biased low because it is measured using a bailer that has a smaller inflow diameter than the bailer diameter. Product thickness was not measured in 11 monitoring/recovery wells as in the DEC letter of 7/7/09. Greater product thickness probably exists at the site because many of the wells that had the greatest product thickness in previous events were not checked (such as monitoring well MW-103 that had 4.68 feet of product during the last monitoring event which was the greatest thickness of product ever measured in this monitoring well, and an increase of 4.55 feet of product thickness since September 2008). Up to 21.5 mg/l DRO in monitoring well MW-122. Up to 0.357 mg/l GRO in monitoring well MW-4. Up to 7.1 ug/l benzene in monitoring well MW-125. Contamination concentrations increased in 1 of the 5 monitoring wells with detectable dissolved contamination, and decreased or was stable in the other 4 monitoring wells with detectable dissolved contamination. Higher dissolved concentrations of benzene, GRO, and DRO probably exist at the site because some former product wells such as MW-10 are not currently being sampled for dissolved contamination. The sentinel monitoring well MW-8 has its highest levels of DRO contamination since 2005 was not sampled this event. Monitoring well MW-122 had it is highest levels of benzene contamination since 2002. Depth to groundwater was 28.34 to 33.59 feet below ground surface. Groundwater generally flows to the north by northwest. Between 2/3/09 and 8/19/09 173 gallons of product was recovered (1.00 gallon per day). Between 10/2/01 and 8/19/09 at total of 12,790 gallons of product have been recovered. Groundwater has risen 3 to 4 feet in the monitoring wells since 2001. Numerous monitoring wells and the drinking water well at 4303 Cope Street that had been requested in the DEC letter of 7/7/09 to be sampled for BTEX/GRO/DRO were not sampled. Robert Weimer
12/16/2010 Document, Report, or Work plan Review - other January 11, 2010 Groundwater Sampling and Product Recovery System Assessment report. The report recommended a reduction in the groundwater monitoring at the site and recommended pulsing the product recovery system to see if that would increase the product recovery rate. Robert Weimer
12/16/2010 Document, Report, or Work plan Review - other October 2010 groundwater monitoring event. The groundwater monitoring, product measurements, and product recovery were not in compliance with DEC’s letter of 7/7/09. Measurable product was found in 5 of the 9 monitoring wells checked this event. The thickness of the product increased in two of the monitoring wells checked. Up to 1.38 feet of product in recovery well RW-2, which is an increase of 0.87 feet of product in the last 90 days. Measured product thickness is biased low because it is measured using a bailer that has a smaller inflow diameter than the bailer diameter. Greater product thickness probably exists because many of the wells that had the greatest product thickness in previous events were not checked (such as monitoring well MW-103 that had 4.68 feet of product during the last monitoring event which was the greatest thickness of product ever measured in this monitoring well, and an increase of 4.55 feet of product thickness since September 2008). Only monitoring well MW-119 had analytical samples collected and it was non-detect for DRO, GRO, and BTEX. None of the drinking water wells in the area were sampled this monitoring event. Depth to groundwater was 32.12 feet below ground surface in monitoring well MW-119. Groundwater generally flows to the north by northwest. Between 6/2/10 and 7/2/10 6.7 gallons of product was recovered (0.22 gallons per day). Between 07/19/10 and 9/30/10 1.8 gallons of product was removed (0.03 gallons per day). Between 10/2/01 and 9/30/10 at total of 12,799 gallons of product have been recovered. Groundwater has risen 3 to 4 feet in the monitoring wells since 2001. Numerous monitoring wells and the drinking water well at 4303 Cope Street that had been requested in the DEC letter of 7/7/09 to be sampled for BTEX/GRO/DRO were not sampled. Robert Weimer
12/28/2010 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72996 Pipeline based on current groundwater and drinking water well sampling data. Robert Weimer
10/17/2012 Document, Report, or Work plan Review - other September 2011 groundwater monitoring event. Measurable product was found in 5 of the 9 monitoring wells checked this event. The thickness of the product increased in three of the monitoring wells checked. Up to 1.41 feet of product in recovery well RW-2, which is an increase of 1.04 feet of product in the last 105 days. Measured product thickness is biased low because it is measured using a bailer that has a smaller inflow diameter than the bailer diameter. Greater product thickness probably exists because many of the wells that had the greatest product thickness in previous events were not checked (such as monitoring well MW-103 that had 4.68 feet of product during the last monitoring event which was the greatest thickness of product ever measured in this monitoring well, and an increase of 4.55 feet of product thickness since September 2008). Only monitoring well MW-119 had analytical samples collected and it was non-detect for DRO, GRO, and BTEX. None of the drinking water wells in the area were sampled this monitoring event. Depth to groundwater was 32.68 feet below ground surface in monitoring well MW-119. Groundwater generally flows to the north by northwest. Between 10/2/01 and 9/30/10 at total of 12,799 gallons of product have been recovered. Robert Weimer
10/17/2012 Document, Report, or Work plan Review - other June 2011 groundwater monitoring event. Measurable product was found in 6 of the 20 monitoring wells checked this event. The thickness of the product increased in two of the monitoring wells checked. Up to 0.38 feet of product in recovery well RW-31. Measured product thickness is biased low because it is measured using a bailer that has a smaller inflow diameter than the bailer diameter. Greater product thickness probably exists because many of the wells that had the greatest product thickness in previous events were not checked (such as monitoring well MW-103 that had 4.68 feet of product during the last monitoring event which was the greatest thickness of product ever measured in this monitoring well, and an increase of 4.55 feet of product thickness since September 2008). Groundwater contaminant concentrations increased in 4 of the 11 monitoring wells sampled. Up to 16.1 mg/l DRO, 0.48 mg/l GRO, and 4.5 ug/l benzene in the groundwater monitoring wells sampled. None of the drinking water wells in the area were sampled this monitoring event. Depth to groundwater was 28.42 to 33.80 feet below ground surface. Groundwater flowed to the north by northwest. Between 10/2/01 and 9/30/10 at total of 12,799 gallons of product have been recovered. Robert Weimer
6/21/2013 Site Visit Site visit to observe current site conditions. Robert Weimer
7/29/2013 Update or Other Action Approved to decommission the two damaged monitoring wells (MW-8 and MW-119) in accordance with the DEC November 2011 Monitoring Well Guidance. DEC requests that AFSC submit a work plan, including a schedule for conducting the work, for the installation of a replacement sentinel well by September 1, 2013. Robert Weimer
9/5/2013 Document, Report, or Work plan Review - other Reviewed proposed replacement sentinel monitoring well location. Requested that the well be placed further south in the N Star Street right-of-way to be better in line with the mass of the remaining free product. They are to submit a work plan for the monitoring well installation with a new well location. Robert Weimer
9/18/2013 Update or Other Action DEC received notification that the decommission the two damaged monitoring wells (MW-8 and MW-119) is going to be conducted today. Robert Weimer
10/8/2013 Document, Report, or Work plan Review - other The RP submitted a work plan for the installation of a replacement monitoring well (for MW-119) between the remaining free product area and the downgradient drinking water well to the northwest of the site. The October 7, 2013 work plan is approved under the following conditions: 1. If higher field reading results are at a different depth than the soil/water interface then an additional soil sample is to be collected and analyzed for the highest field reading depth. 2. No soil analytical samples are requested for the unused soil generated, the analytical sample(s) collected from the soil boring can be used to characterize those soil for treatment/disposal. 3. The treatment/disposal of the unused soil generated will be under a separate request to DEC based on the results of the boring analytical sample(s). Robert Weimer
11/7/2013 Document, Report, or Work plan Review - other October 2012 groundwater monitoring event. Measurable product was found in 4 of the 10 monitoring wells checked this event. Up to 0.31 feet of product in recovery well RW-1. Measured product thickness is biased low because it is measured using a bailer that has a smaller inflow diameter than the bailer diameter. Greater product thickness probably exists because many of the wells that had the greatest product thickness in previous events were not checked (such as monitoring well MW-103 that had 4.68 feet of product during the last monitoring event which was the greatest thickness of product ever measured in this monitoring well, and an increase of 4.55 feet of product thickness since September 2008). Only monitoring well MW-119 had analytical samples collected and it was non-detect for DRO, GRO, and BTEX. None of the drinking water wells in the area were sampled this monitoring event. Depth to groundwater was 31.94 feet below ground surface in monitoring well MW-119. Groundwater generally flows to the north by northwest. Between 10/2/01 and 9/30/10 at total of 12,799 gallons of product have been recovered. The monitoring well was purged prior to sampling with an in-well pump at 34 feet below ground surface. Robert Weimer
11/7/2013 Document, Report, or Work plan Review - other August 2012 groundwater monitoring event. Measurable product was found in 4 of the 19 monitoring wells checked this event. The thickness of the product increased in two of the monitoring wells checked. Up to 0.75 feet of product in recovery well RW-31. Measured product thickness is biased low because it is measured using a bailer that has a smaller inflow diameter than the bailer diameter. Greater product thickness probably exists because many of the wells that had the greatest product thickness in previous events were not checked (such as monitoring well MW-103 that had 4.68 feet of product during the last monitoring event which was the greatest thickness of product ever measured in this monitoring well, and an increase of 4.55 feet of product thickness since September 2008). Groundwater contaminant concentrations increased in 4 of the 11 monitoring wells sampled. Up to 29.8 mg/l DRO, 0.35 mg/l GRO, and 8.6 ug/l benzene in the groundwater monitoring wells sampled. None of the drinking water wells in the area were sampled this monitoring event. Depth to groundwater was 30.66 to 33.31 feet below ground surface. Groundwater flowed to the north by northwest. Between 10/2/01 and 9/30/10 at total of 12,799 gallons of product have been recovered. The monitoring wells we purged prior to sampling with an in-well pump. Robert Weimer
11/13/2014 Document, Report, or Work plan Review - other July 2013 groundwater monitoring event. Measurable product was found in 3 of the 19 monitoring wells checked this event. Up to 0.12 feet of product in recovery well RW-2 measured by water-oil interface probe. Greater product thickness probably exists because many of the wells that had the greatest product thickness in previous events were not checked (such as monitoring well MW-103 that had 4.68 feet of product during the last monitoring event which was the greatest thickness of product ever measured in this monitoring well, and an increase of 4.55 feet of product thickness since September 2008). Ten monitoring wells had analytical samples collected this event had up to 4.28 mg/l DRO, 0.22 mg/l GRO, and 5.6 ug/l benzene. Concentrations increased in 4 of the 10 monitoring well samples. None of the drinking water wells in the area were sampled this monitoring event. Depth to groundwater was between 27.42 to 32.54 feet below ground surface. Groundwater flow direction was to the northwest. Between 10/2/01 and 9/30/10 at total of 12,799 gallons of product have been recovered. The monitoring wells were purged prior to sampling with an in-well pump. Robert Weimer
9/14/2015 Document, Report, or Work plan Review - other ADEC conditionally approves request to decommission monitoring wells MW-7, MW-21, MW-112, MW-113, MW-117, and recovery well RW-4. These wells are in an area of road construction and lane expansion at the Arctic and Tudor intersection. The condition is that replacement monitoring wells/recovery wells may be required in the future. Robert Weimer
9/15/2015 Document, Report, or Work plan Review - other September 2014 groundwater monitoring event. Measurable product was found in 3 of the 20 monitoring wells checked this event. Up to 0.87 feet of product in recovery well RW-115 measured by water-oil interface probe. Greater product thickness probably exists because many of the wells that had the greatest product thickness in previous events were not checked (such as monitoring well MW-103 that had 4.68 feet of product during the last monitoring event which it was measured. Ten monitoring wells had analytical samples collected this event had up to 25.0 mg/l DRO, 0.37 mg/l GRO, and 13.0 ug/l benzene. Concentrations increased in 3 of the 10 monitoring well samples. None of the drinking water wells in the area were sampled this monitoring event. Depth to groundwater was between 25.28 to 30.56 feet below ground surface. Groundwater flow direction was to the northwest. Between 10/2/01 and 9/30/10 at total of 12,799 gallons of product have been recovered. The monitoring wells were purged prior to sampling with an in-well pump. Robert Weimer
9/15/2015 Document, Report, or Work plan Review - other October 2014 groundwater monitoring event. Sentinel monitoring well MW-200 located between the product on the active down gradient drinking water well was non-detect for BTEX, GRO, and DRO.The monitoring wells were purged prior to sampling with an in-well pump. Robert Weimer
11/9/2015 Update or Other Action ADEC received notification that as part of the widening of Arctic Boulevard at Tudor Road the product recovery shed and its fencing are to be removed because they are now in the easement of the new Chugach Electric subsurface powerline to be installed in the area. AFSC's consultant will be submitting a decommissioning plan to ADEC for review and approval soon. After construction is completed a new groundwater sampling plan and a feasibility plan for a replacement product recovery system will be submitted to ADEC for review and approval. Robert Weimer
5/23/2016 Document, Report, or Work plan Review - other 2015 Summer and Fall Groundwater Monitoring Report for the Crosstown Pipeline located at Arctic Boulevard and Tudor Road, Anchorage AK. File 2100.38.438. Groundwater elevations show an overall rise since 2001. Groundwater flow direction to the northwest and gradient were generally consistent with previous observations. LNAPL was detected in five recover wells in July and six recovery wells in October. The dissolved phase DRO plume continues to be present around MW-113, MW-122 and MW-125. The plume appears to be stable at this time. Recovery of free product on top of the groundwater and annual monitoring is still a high priority. Darren Mulkey
6/3/2016 Document, Report, or Work plan Review - other Received the Draft VES Recovery System Decommissioning Work Plan on June 3 2016. Due to pending road construction on the corner of Arctic and Tudor the recovery system and associated recovery wells will be decommissioned and removed to clear the easement/right-of-way. After the road construction is completed continued LNAPL recovery with installation of new recovery wells is proposed. Darren Mulkey
6/7/2016 Meeting or Teleconference Held Met with representatives of ASFC and ASIG to discuss current situation for this site. In order to accommodate the MOA project schedule for road construction the following has already occurred: disconnect electricity from the recovery shed; air compressor and building were removed; decommission wells RW-4, MW-7, MW-21, MW-113, and MW-117; and a letter documenting this work will be completed and submitted to ADEC. Remaining work proposed to complete clearing the easement for the road work include: disconnect and remove the recovery system shed; remove the recovery system components; decommission and remove recovery system wells (RW-1, RW-2, RW-3, RW-31, RW-115, RW-116 and RW-120. A revised 2016 Monitoring Plan will be developed and submitted to ADEC for approval. After the road construction is completed a new free product recovery/feasibility study work plan will be submitted to ADEC for approval. Darren Mulkey
7/6/2016 Document, Report, or Work plan Review - other ASIG on behalf of AFSC has submitted a VES System Operation Summary Report. To date approximately 13,651 gallons of LNAPL (Jet Fuel) have been recovered through the VES System and manual recovery. The MOA is currently expanding the Arctic and Tudor intersection by adding a turning lane on the east side of Arctic. This construction has impacted the monitoring and recovery wells in this area and they had to be decommissioned. Once the road construction is completed AFSC will conduct a remediation assessment to evaluate recovery/remediation alternatives for this site. Darren Mulkey
9/23/2016 Document, Report, or Work plan Review - other On behalf of AFSC, Ahtna Engineering Services submitted the Final Well Decommissioning Report, Crosstown Pipeline, Arctic Boulevard and Tudor Road, Anchorage, Alaska - ADEC File No. 2100.38.438, dated September 22, 2016. This report documents the decommissioning of MW-7,MW-13, MW-21, MW-100, MW-112, MW-113, MW-117 and RW-4 from in and around the intersection of Arctic Blvd. and Tudor Rd. The wells were decommissioned due to extensive road reconstruction by MOA and ADOT at this intersection which required the removal of these wells because they were in the Right-of-Way construction footprint. Fieldwork for this project was completed from September 21, 2015 through October 10, 2015 and on August 27, 2016. The work was split between 2015 and 2016 due to access issues. Darren Mulkey
5/23/2017 Document, Report, or Work plan Review - other ASIG submitted 2017 Groundwater Monitoring Work Plan dated April 27, 2017 authored by Ahtna Engineering Services, LLC. The Work Plan outlined one more round of sampling the end of May to assess current groundwater quality at wells MW-30, MW-122, MW-123, MW-124, MW-125, MW-126, MW-127, and MW-200 and LNAPL thickness at RW-1, RW-2, RW-3, RW-31, RW-115, RW-116, and RW-120. Wendy Hansen
6/28/2017 Document, Report, or Work plan Review - other Approved Final 2017 Groundwater Monitoring Work Plan dated June 22, 2017. Minor revisions were made to the April 27, 2017 draft to incorporate ADEC comments. Wendy Hansen
7/18/2017 Meeting or Teleconference Held DEC Staff met with ASIG, ASIG Contractor (Ahtna), and S. Reeves from Reeves Amodio (representing land owner) to discuss status and path forward for the site. ASIG would like to obtain property access for groundwater monitoring and decommissioning activities. Proposed decommissioning includes monitoring and recovery wells and the VES recovery system. Wendy Hansen
8/22/2017 Site Visit DEC Staff met with ASIG and visited the site while groundwater sampling was being conducted by Ahtna Environmental. The purpose of the site visit was for general familiarity. Wendy Hansen
2/21/2018 Document, Report, or Work plan Review - other Staff provided comments to the 2017 Groundwater Monitoring Report for the Crosstown Pipeline located at Arctic Boulevard and Tudor Road, Anchorage AK. File 2100.38.438. The report was written by Ahtna Engineering Services, LLC (Ahtna) and submitted to the ADEC on February 5, 2018. The report summarizes groundwater monitoring conducted in August and October of 2017. Water level and light, non-aqueous phase liquid (LNAPL) measurements were collected from eight monitoring wells and seven recovery wells. Groundwater analytical samples were collected from eight monitoring wells. The samples were analyzed for GRO, DRO, PAH, and petroleum-related VOCs. Groundwater elevations show an overall rise since 2001. Groundwater flow direction was assumed to be toward the northwest based on previous data. LNAPL was detected in all site recovery wells (RW-1, RW-2, RW-3, RW-31, RW-115, RW-116, and RW-120 [trace]). The maximum thickness was at RW-31 (1.22 feet) and RW-115 (1.18 feet). The dissolved phase DRO plume continues to be present around MW-120, MW-122 and MW-125. A Mann-Kendall Trend analysis conducted by Ahtna indicated the DRO plume appears to be stable at this time in MW-125 and MW-126. No trend was observed for MW-122 where results are highly variable and LNAPL is present. DRO was detected at MW-127 for the first time since 2009 and at MW-200 for the first time since sampling began at the well in 2014. PAHs and fuel related VOCs were analyzed for all wells sampled. The report recommended obtaining survey data for MW-200 for use in future calculations of groundwater flow. Product recovery and remediation is still a priority, as well as continued groundwater monitoring. A report is pending for 2017 decommissioning activities, which may not be completed until spring of 2018. Wendy Hansen
4/3/2018 Meeting or Teleconference Held DEC staff met with Responsible Party ASIG (now Menzies) and Consultant Ahtna Environmental, Inc. to discuss site status and path forward. A letter was subsequently issued (on April 24, 2018) to document DEC's understanding based on the meeting and subsequent discussions. The letter re-establishes a schedule for continued product recovery and/or remediation. Wendy Hansen
4/25/2018 Workplan Requested A letter was issued to Responsible Party to document DEC's understanding of agreements based on the April 3, 2018 meeting, and subsequent communications. The letter re-establishes a schedule for continued product recovery and/or remediation and requests a work plan for continued product recovery by June 30, 2018, or alternatively a work plan to evaluate the feasibility of continued product recovery (based on current site conditions) by May 31, 2018 with reporting by June 14, 2018. Wendy Hansen
5/2/2018 Document, Report, or Work plan Review - other Staff received Final 2017 Groundwater Monitoring Report for the Crosstown Pipeline located at Arctic Boulevard and Tudor Road, Anchorage AK. File 2100.38.438. Wendy Hansen
8/8/2018 Document, Report, or Work plan Review - other Staff received the final work plan for 2018 groundwater monitoring. The plan addressed DEC comments provided for a draft work plan submitted on July 26, 2018. Water level and LNAPL measurements will be taken from all 15 existing site wells, seven (7) recovery wells and eight (8) monitoring wells. LNAPL will be measured initially with an oil-water interface probe and subsequently with a bailer. Groundwater samples will be collected from the monitoring wells using a bladder pump and low flow methodology, and analyzed for VOC-petroleum, GRO, DRO, and PAH. LNAPL measurements obtained from the field event will be used to determine locations for subsequent product recovery bail-down tests. Wendy Hansen
11/9/2018 Document, Report, or Work plan Review - other Staff reviewed a work plan to conduct product baildown testing at the site, and provided comments. The plan proposes to perform baildown testing at two site recovery wells and calculate LNAPL transmissivity. Wendy Hansen
12/14/2018 Document, Report, or Work plan Review - other Staff reviewed draft 2018 Groundwater Monitoring Report, and provided comments. The report was written by Ahtna Engineering Services, LLC (Ahtna) and submitted to the ADEC on November 6, 2018. The report summarizes groundwater monitoring conducted in August of 2018. Water level and light, non-aqueous phase liquid (LNAPL) measurements were collected from seven monitoring wells and seven recovery wells. Groundwater analytical samples were collected from seven monitoring wells. One monitoring well (MW-122) was not sampled because it was destroyed during construction activities. The samples were analyzed for GRO, DRO, PAH, and petroleum-related VOCs. Groundwater elevations showed an overall rise since 2001. Generally elevations were 0.25 feet lower than in 2017 and 1.0 foot higher than in 2001. Groundwater flow direction was assumed to be toward the northwest based on previous data. LNAPL was detected in all site recovery wells (RW-1, RW-2, RW-3, RW-31, RW-115, RW-116, and RW-120), except for RW-120 ranging from 0.04 to 1.25 feet. The maximum thickness was at RW-2 (1.25 feet) and RW-1 (1.21 feet). The dissolved phase DRO plume continues to be present around MW-120, MW-122 and MW-125. A Mann-Kendall Trend analysis conducted by Ahtna indicated a stable trend at MW-125 and no trend at MW-126. The report recommended obtaining survey data for MW-200 for use in future calculations of groundwater flow. Wendy Hansen
12/14/2018 Document, Report, or Work plan Review - other Staff approved work plan to conduct product baildown testing at the site. Comments were satisfactorily addressed. Wendy Hansen
1/28/2019 Document, Report, or Work plan Review - other Staff received final 2018 Groundwater Monitoring Report, dated January 28, 2019. Next sampling activities will attempt to measure top of screen at the wells to show water levels relative to screened interval. In addition, wells are to be professionally surveyed to help confirm groundwater flow. Wendy Hansen
5/16/2019 Document, Report, or Work plan Review - other Staff reviewed a draft bail down test report, and provided comments. Wendy Hansen
5/24/2019 Document, Report, or Work plan Review - other Received final 2019 Baildown Test Report. All comments provided on May 16 were adequately addressed. Baildown testing was performed at wells RW-1 and RW-115. LNAPL transmissivity was measured at each well with results of 0.041 and 0.001 feet squared per day, respectively. This was below the ITRC reference range of 0.1 to 0.8 feet squared per day for practicable recovery. The report recommended no further product recovery and decommissioning of product recovery wells. Wendy Hansen
9/25/2019 Meeting or Teleconference Held Staff meet with Menzies Aviation Environmental Manager and contractor Ahtna to discuss the site, and path forward. Topics included 2019 groundwater monitoring, drinking water well survey, replacement of well MW-122, decommissioning of all product recovery wells (except for one [RW-2] to monitor water levels), remediation alternatives, and soil delineation or documentation of past removal actions. Wendy Hansen
10/7/2019 Document, Report, or Work plan Review - other Staff approved work plan for 2019 groundwater monitoring activities. LNAPL and groundwater level measurements will be collected from all seven each site recovery wells and groundwater monitoring wells. Analytical samples will be collected from the seven groundwater monitoring wells for GRO, DRO, fuel related VOCs, and PAH. Ahtna will attempt to determine monitoring well screen intervals through a search of boring logs/ well completion forms and/or measurement in the field. All monitoring well elevations will be resurveyed to calculate hydraulic gradient at the site. Wendy Hansen
10/30/2019 Document, Report, or Work plan Review - other Staff approved a work plan to decommission all site recovery wells except for one (RW-1 or RW-2). This includes RW-120, RW-3, RW-115, RW-116, and RW-31. The one remaining recovery well will be converted to a monitoring well for future product and/or groundwater monitoring purposes. The decommissioning report will document these activities, as well as those conducted in 2017 under the VES Recovery System Decommissioning Work Plan. Prior activities include decommissioning of the recovery well piping system and associated field screening and analytical sampling. Wendy Hansen
4/3/2020 Document, Report, or Work plan Review - other Staff reviewed draft 2019 Groundwater Monitoring Report, and provided comments. The report was written by Ahtna Engineering Services, LLC (Ahtna). The report summarizes groundwater monitoring conducted in October of 2019. Groundwater analytical samples were collected from six monitoring wells. One monitoring well (MW-120) was not sampled due to low water levels. Samples were analyzed for GRO, DRO, PAH, and petroleum-related VOCs. Groundwater flow direction was observed to be toward the northwest based on October measurements. LNAPL was detected in all site recovery wells (RW-1, RW-2, RW-3, RW-31, RW-115, and RW-116)except for RW-120 ranging from 0.01 (RW-31) to 1.57 feet (RW-2). The thickness at RW-120 was not measured because the casing was broken. The dissolved phase DRO plume continues to be present around MW-120, MW-122 and MW-125, and appears to have expanded to MW-126. Benzene was detected above the cleanup level at MW-125. A Mann-Kendall Trend analysis conducted by Ahtna indicated a stable trend at MW-125 and no trend at MW-126. Wendy Hansen
5/26/2020 Update or Other Action Staff approved of final 2019 groundwater monitoring report and Ahtna's May 13th response to DEC's comments on the path forward provided monitoring well RW-210 is decommissioned in the future. DEC is requesting to meet with the owner of Idle Wheels Trailer Court and Menzies Aviation in two weeks to discuss the path forward to site cleanup. Todd Blessing
11/30/2020 Update or Other Action Menzies Aviation sent in a letter from Ahtna, their contractor, dated October 14, 2020 about additional soil assessment at Additional Soil Assessment at Idle Wheels Trailer Park. Janice Wiegers
1/28/2021 Update or Other Action DEC responded to letter dated 10/14/20 suggesting additional soil characterization prior to completing a feasibility study. DEC concurred, and recommended soil gas sampling within 30 feet of petroleum contamination or fuel saturated smear zone. DEC also asked about whether additives would be expected in the spilled fuel and DEC's previous request for a refresher well search in a 4/4/20 letter. Janice Wiegers
5/13/2021 Document, Report, or Work plan Review - other DEC staff reviewed and commented on Ahtna Engineering Services, LLC's work plan dated April 22, 2021. The work plan was constructed to further evaluate the nature and extent of contamination at various depths on the Idle Wheels Trailer Court property. Work plan comments were provided via email to Menzies and Ahtna. Todd Blessing
5/25/2021 Update or Other Action DEC reviewed Ahtna Engineering Services, LLC's response to DEC's comments on the site characterization work plan dated, April 22, 2021. The response to comments were accepted and DEC requested the work plan be finalized. Todd Blessing
6/8/2021 Site Characterization Workplan Approved The work plan prepared by Ahtna Engineering Services, LLC (Ahtna), originally dated 4/22/2021, was reviewed and commented on by the ADEC, updated to reflect the comments and resubmitted to the ADEC on June 2, 2021. Project objectives include assessing the degree and extent of a jet fuel release associated with the Cross-town pipeline that impacted soil in the south east corner of the Wagon Wheel Trailer Park located on the southwest corner of the Arctic Blvd and Tudor Road intersection. Fourteen soil borings will be advanced and soil samples will be collected from areas of highest field screening levels, from the upper edge of impacted soil, and from the groundwater interface. One to three soil samples will be collected from each boring. One boring will be advanced to allow for installation of a monitoring well MW-128 across the water table. The new monitoring well will be developed but sampling will occur as a part of the annual groundwater monitoring program which will be detailed in a separate work plan. Results of this site characterization event will assist in assessing the potential soil vapor exposure pathway for future buildings that may be placed in the area and will help assess remedial options for additional cleanup at the site. The well MW-128 will be located along the northern edge of the plume to monitor down-gradient contamination. Shawn Tisdell
11/2/2021 Update or Other Action Well decommissioning activities associated with the upgradient neighboring site Texaco-#85-Arctic site (haz ID 23605)resulted in the reported removal of monitoring well MW-30, which is a east side-gradient well on the north east quadrant of the Arctic Blvd and Tudor Rd intersection. The ADEC is communicating with consultants from both sites to determine if a replacement is needed. Shawn Tisdell
2/8/2022 Document, Report, or Work plan Review - other Groundwater monitoring and sampling was conducted by Ahtna Engineering Services, LLC on September 14 and 15th, 2021. A level loop survey of wells was also conducted during this time. Diesel range organics (DRO) was detected in all samples, however only MW125, MW-126 and MW-128 contained DRO above ADEC cleanup levels (1.5 mg/L), with results of 10.2 mg/L, 1.55 mg/L, and 3.28 mg/L respectively. All polyaromatic hydrocarbons (PAHs) and volatile organic hydrocarbons (VOCs) were less than cleanup levels (CUL) with the exception of benzene (CUL 4.6 µg/L), which was detected in MW-125 at 11.2 µg/L. A Mann-Kendall trend analysis was conducted using DRO concentrations for the past 14 sampling events on wells MW-125 where a stable trend was observed and MW-126 where no trend in DRO concentrations was observed. This trend analysis suggests that the dissolved-phase plume is stable. Recommendations in the report include continuing at least biennial monitoring of groundwater to ensure plume configuration does not significantly change and plan for mitigation of the remaining petroleum contaminants in groundwater. Shawn Tisdell
3/3/2022 Site Characterization Report Approved The ADEC has reviewed a Supplemental Soil Characterization Report that provided assessment of the petroleum soil vapor pathway in an area that may receive mobile homes in the future and replacement of a monitoring well along a leading edge of the groundwater plume. Seven soil borings were advanced to 15 feet below ground surface( bgs) to assess the impacts to subsurface soils within the zone of likely exposure to receptors. Three soil borings were advanced to a depth of 35 feet bgs to assess soil contamination within the smear zone and at the groundwater interface. One additional soil boring was advanced for the installation of monitoring well MW-128, which is replacing the decommissioned monitoring well MW-122. A total of 18 primary and two duplicate analytical soil samples were collected during project activities. Contamination about the ADEC cleanup levels only exists in subsurface soils from 28 to 32 feet bgs. Further site remediation is likely to focus on groundwater remediation. This work suggests that placement of trailers in this area would not pose a human health risk to residents occupying trailers in this area. Shawn Tisdell
3/16/2022 Meeting or Teleconference Held ADEC staff met with the consultant and responsible party (RP) to review the site history, discussing site closure options and deliberate on how to move towards closure for the site. Additional correspondence with the landowner of the Idle Wheels trailer park will help determine how to proceed with cleanup action at the site. Shawn Tisdell
3/22/2022 Update or Other Action Uploaded the finalized 2021 Groundwater Monitoring Report as an attachment for public viewing. Shawn Tisdell
5/18/2022 Update or Other Action A replacement monitoring well, MW-30R, was installed following an unauthorized abandonment of monitoring well MW-30. MW-30R was installed in a location ~5’ to the northeast of the former well location. Per the ADEC approved Work Plan, the well was installed to a depth of 40’ bgs with 15’ of screen from 25-40’ feet , spanning the water table observed at ~30’ bgs. Final water level measurements and well construction diagram will be provided after final completion of the monitoring well. No obvious contaminant impacts were made at any interval above or below the groundwater interface. Soil samples were collected and will be analyzed for petroleum contamination. Shawn Tisdell
7/7/2022 Meeting or Teleconference Held DEC staff met with the landowner, RP, and their legal representatives to discuss site history and considerations for site closure. Shawn Tisdell
1/4/2023 Update or Other Action Letter received from RP following up the July 7th meeting between AFSC/Menzies(RP), Idle Wheels(landowner) and ADEC. Landowner has not contacted RP and the RP wishes to move forward with development of environmental covenant and site closure documents. The RP requests the ADEC confirm with the landowner that conditional site closure is acceptable and begin covenant development. Shawn Tisdell
1/9/2023 Exposure Tracking Model Ranking A new updated ranking with ETM has been completed for source area 72996 Pipeline. Shawn Tisdell
10/6/2023 Update or Other Action Maintenance Inspections of environmental monitoring wells was reviewed and approved. The objective of this work includes assessment and documentation of the condition of the environmental monitoring wells and recovery well vault associated with the AFSC former Cross-town Pipeline site. Minor damage will be addressed as needed; major damage will be reported to AFSC. Shawn Tisdell
1/29/2024 Site Characterization Report Approved Final 2023 AFSC Former Cross-Town Pipeline Maintenance Inspections Arctic Boulevard and Tudor Road Intersection Report has been reviewed and approved. Eight monitoring wells were located, inspected and conditions were documented. Locks and well caps for three wells were replaced. Protective monuments for two wells may need replacement in Spring of 2024 if well use will continue. Well MW-114 was not located. Shawn Tisdell

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