| Action Date |
Action |
Description |
DEC Staff |
| 10/15/1994 |
Update or Other Action |
(Old R:Base Action Code = RPL1 - Initiate Dialog with RP). Limited remedial plan. |
Ray Dronenburg |
| 10/17/1994 |
Cleanup Plan Approved |
(Old R:Base Action Code = SA1R - Phase I SA Review (CS/LUST)). This office has reviewed the proposal for a Limited Remedial Action activity for this site. In the interest of seeing progress with this site, the proposal is approved. The department will require documentation regarding the actual stockpiling location. |
Ray Dronenburg |
| 2/10/1995 |
Site Added to Database |
Site added to database. |
Ray Dronenburg |
| 6/16/1995 |
Site Ranked Using the AHRM |
Initial ranking. Action code added because it wasn't when the site was originally ranked. |
Ray Dronenburg |
| 4/8/1996 |
Update or Other Action |
This site is in litigation. |
Ray Dronenburg |
| 3/8/2000 |
Site Ranked Using the AHRM |
File review update ranking with current information. |
David Pikul |
| 3/9/2003 |
Update or Other Action |
ADEC received work plan prepared by Shannon & Wilson, Inc for the Alaska Department of Transportation & Public Facilities (ADOT&PF) on March 9, 2003. |
Beatrice Egbejimba |
| 3/19/2003 |
Update or Other Action |
ADEC reviewed work plan and made phone calls to Ron Stroman of ADOT&PF. |
Beatrice Egbejimba |
| 3/20/2003 |
Update or Other Action |
ADEC sent letter to Ron Stroman of ADOT&PF with a request for additional information. An addendum to the work plan should be sent to ADEC by April 1, 2003. |
Beatrice Egbejimba |
| 4/7/2003 |
Update or Other Action |
Deadline for work plan addendum submittal moved to April 14, 2003 per phone conversation with Ron Stroman. Ron also indicated that they may have located parcel B. Stockpile from the MarkAir facility was moved to Parcel B. They plan on taking samples from the stockpile. |
Beatrice Egbejimba |
| 4/21/2003 |
Update or Other Action |
ADEC sent approval letter to Ron Stroman of ADOT&PF with approval of site characterization work plan received 4/17/03. |
Beatrice Egbejimba |
| 9/11/2003 |
Update or Other Action |
ADEC received site characterization report. |
Beatrice Egbejimba |
| 9/23/2003 |
Update or Other Action |
ADEC sent letter to Ron Stroman with approval of the Site Characterization report received September, 2003. No further remedial action was requested for the three decommissioned floor drains and former fuel pipeline. However the on-site drinking water well contained 0.529 mg/kg DRO. The report also indicated that a maximum concentration of 3,330 mg/kg DRO and 3.54 mg/kg Arsenic was present in the vicinity of the above ground storage tanks (AST). ADEC approved the report and requested additional investigation of the soil and groundwater is necessary in the vicinity of the above ground storage (AST). |
Beatrice Egbejimba |
| 11/13/2003 |
Meeting or Teleconference Held |
ADEC met with Ron Stroman of ADOT and Dan McMahon of Shannon & Wilson to discuss several MarkAir sites. The out come of the meeting are as follows:
1. MarkAir Nome – ADOT proposed to undertake soil/groundwater investigation at the site with a $15,000 tank removal aid from ADEC. ADEC will seek CIP funds for the tank removal expense.
2. MarkAir Dillingham – ADOT proposed to undertake soil/groundwater investigation at the site with a $12,000 tank removal aid from ADEC. ADEC will seek CIP funds for the tank removal expense.
3. King Salmon – DEC Drinking water program will be provided with information on the on-site drinking water well. Details of groundwater impact will be provided. An increase from 0.5629 mg/L DRO to 1.4 mg/L DRO has been recorded.
Also ADOT lessee (AIDA) will be contacted. The contact person for AIDA is Jim McMillan. Ron Stroman will provide ADEC with contact information for AIDA. AIDA has leased this property to Brisol Bay Borough and Alaska Airlines. Both parties will be informed about the impacted drinking water well by DEC (CS program or Drinking water program).
4. MarkAir Barrow – Dan McMahon will provide a workplan addressing concerns presented in ADEC’s November 2003 letter regarding Bioremediation project. It was agreed that suprapermafrost groundwater issues will not be investigated at this time. |
Beatrice Egbejimba |
| 11/18/2003 |
Update or Other Action |
The drinking water well at the King Salmon Airport is no longer potable. AIDEA has been informed by ADOT but a followup letter will be sent to Jim McMillan by ADEC. This well has not been registered and AIDEA does not wish to register well untill it becomes portable. Heather Newman (Drinking Water Program) has been informed. |
Beatrice Egbejimba |
| 6/4/2004 |
Update or Other Action |
Staff sent e-mail approval to Dennis Howard (contract section ADEC) after reviewing a decommissioning plan prepared by Shannon & Wilson for the former Mark Air site. The plan proposes to decommission two tanks and perform soil sampling in the vicinity of the tank. ADOT&PF had agreed to sign for any hazardous material generated during this investigation. EPA identification number AKD981764772 generated by Dan of ADOT has been proposed for use. |
Beatrice Egbejimba |
| 6/21/2004 |
Meeting or Teleconference Held |
ADEC met with Ron Stroman of ADOT and Dan McMahon of Shannon & Wilson to discuss long term remedial plans for the various Mark Air sites. Specifically, the possibility of land spreading impacted soil on ADOT&PF owned airport parcels in Dillingham, Nome, Kodiak, Kotzebue and King Salmon. ADEC had no objections to this plan however Jim Frechione (Environmental Conservation Manager) stressed the need to prevent run-on and run-off during the remediation process. Land spreading is currently being used to remediate soils at the Aniak Airport. |
Beatrice Egbejimba |
| 7/8/2004 |
Meeting or Teleconference Held |
DEC met with ADOT&PF and their contractor to discuss next phase of site work. |
David Pikul |
| 7/26/2004 |
Update or Other Action |
File number issued 2569.38.009 |
Aggie Blandford |
| 11/17/2004 |
Update or Other Action |
DEC staff completed review of the document titled: Underground Storage Tank Closure Assessment Lot 2, Block 11Nome Alaska dated October 2004. Soil and groundwater are impacted by DRO and benzene above cleanup levels. It is expected that DEC will be conducting an area-wide review of the Airport property to understand the "big" picture of contamination airport-wide. |
David Pikul |
| 11/18/2004 |
Meeting or Teleconference Held |
DEC staff met with Ron Stroman ADOT and S&W to discuss future site activities. |
David Pikul |
| 4/28/2005 |
Update or Other Action |
DEC issued work plan approval for the decommissioning of the drinking water well associated with the site known as the “Former Mark Air facility” in King Salmon. The well was determined to be leaking along the outside of the casing allowing DRO contamination migration from the upper aquifer to the drinking water aquifer below. The well will be perforated along its entire length and slurry grouted. It is expected that the pressure from the weight of the grout will be sufficient to penetrate the perforations and seal the outer casing. |
David Pikul |
| 7/7/2005 |
Update or Other Action |
DEC completed review of the document titled: “Well decommissioning, Lot 2, Block 1, King Salmon Airport, King Salmon, Alaska” dated June 17, 2005 prepared by Shannon & Wilson, Inc. Well decommissioning activities included: removal of the well pump and supply piping from the well; perforation of the well casing along its full length with a pneumatic hammer, which consisted of one-inch slots; cutting the casing 3.5 feet below grade; filling of the casing with 160 gallons of volclay grout slurry; finish weld a steel cap to the top of the casing; and backfill and compaction to finish grade. There was no evidence of free product. Groundwater table was measured at 29.17 feet from top of casing (TOC). The well pump was set at 67 feet below TOC and the bottom of the well was measured at 96.17 feet below TOC. |
David Pikul |
| 10/25/2005 |
Update or Other Action |
DEC issued a letter to the new leasseholder indicating that DEC would manage and dispose of the 8 super sacks and 8 55-gallon drums of soil that are on-site. |
David Pikul |
| 2/16/2006 |
Update or Other Action |
The Department of Environmental Conservation, Contaminated Sites Program, (DEC) approved a cost proposal for the tasks listed below for an amendment to the current NTP issued for the Alaska Department of Transportation & Public Facilities (ADOT&PF) King Salmon Airport Global Information Systems (GIS) project. The amendment tasks include: Inclusion of all historical soil and groundwater data for State-owned and private contaminated sites located in the project area; Development of interpolated groundwater contaminant plume maps using ARCMAP GIS for each sampling event for each site as applicable; and Development of a summary guidance document to assist with implementation and manipulation of data contained in the final deliverable. DEC requested that these tasks be implemented as soon as possible and completed by March 31, 2006. |
David Pikul |
| 6/1/2006 |
Site Characterization Workplan Approved |
The Department of Alaska, Contaminated Sites Program, (DEC), has completed review of the document titled: “Additional Site Characterization Work Plan, Former MarkAir Facility, Lot 2, Block 1, King Salmon Airport, Alaska” dated May 5, 2006 prepared by Shannon & Wilson. The work plan is approved. The project will consist of advancing five soil borings, installing five groundwater monitoring wells, collecting soil and groundwater samples, and preparing a summary report. |
David Pikul |
| 10/1/2006 |
Site Characterization Report Approved |
Recieved 'Additional Site Characterization, Former Mark Air Facility, King Salmon, Alaska'. Five soil borings were advanced and completed at monitoring wells B7MW - B11MW. Soil samples collected from borings contained DRO up to 3,440 mg/kg and benzene up to 0.0551 mg/kg. The new wells, along with existing wells B1MW-B3MW and B6MW were sampled. Free phase product was found in wells B4MW (0.87'), B5MW (4.21'), and B9MW (0.91'). Groundwater monitoring found DRO or benzene above Table C cleanup levels in 6 of the 8 wells sampled. |
Bill O'Connell |
| 11/21/2006 |
Site Characterization Report Approved |
Received October 2006 groundwater monitoring report. Wells B4MW, B5MW, and B9MW continue to have free product, with a max thickness 5.64 feet recorded in B9MW. Wells B1MW, B2MW, B3MW, B7MW, B10MW, and B11MW have contaminants above Table C cleanup levels, primarily DRO and benzene. |
Bill O'Connell |
| 6/7/2007 |
Site Characterization Workplan Approved |
NTP issued to S&W. Reviewed work plan for additional characterization at MarkAir in KS. Boreholes will be advanced and completed as monitoring wells to delineate the extent of the dissolved phase hydrocarbon plume. Initial plans were to install additional borings/wells in the parking area in front of the terminal, however ADOT is planning a road realignment in front of the airport to include the parking area. Due to the risk to exisiting or new monitoring wells, no activities will be conducted in this area until after ADOT has completed theri activities. |
Bill O'Connell |
| 10/16/2007 |
Site Characterization Report Approved |
Received Groundwater and Free Product Evaluation Report for Mark Air. QA/QC conducted. Seven soil borings were advanced and completed as monitoring wells B12MW - B18MW. Soil samples collected from soil borings did not contain detectable concentrations of hydrocarbons except in B14. Sample B14S6 collected 12.5-14.4 feet bgs from the apparent smear zone contained DRO at 258 mg/kg. Benzene was not detected in any of the soil samples. Free product was identified in B4MW, B5MW, B9MW, B10MW, and B11MW ranging in thickness from 1.63' in B4MW to 0.01' in B10MW and B11MW. DRO was detected above the Table C cleanup level in B1MW, B2MW,B7MW,B14MW, and B18MW ranging from 31.6 mg/l in B2MW to 1.58 mg/l in B14MW. DRO was also detected in B3MW, B15MW, B16MW, and B17MW but at concentrations below Table C. Benzene was detected above the Table C cleanup level in B2MW (0.170 mg/l) and B18MW (0.0103 mg/l. Benzene was not detected in the other wells. A drinking water sample collected from the King Ko Inn well contained benzene above drinking water MCLs at 0.00918 mg/l. |
Bill O'Connell |
| 11/1/2007 |
Exposure Tracking Model Ranking |
Intitial Ranking Complete for Source Area: 72857 (Autogenerated Action) |
|
| 6/9/2009 |
Document, Report, or Work plan Review - other |
Reviewed Additional Site Characterization Work Plan, Former MarkAir Facility, King Salmon Alaska. Three additional monitoring wells will be installed and sampled to further delineate the plume south and west of the source area. Soil samples will be collected during MW installation and groundwater samples will be collected from the new wells, and also from existing wells B14MW to B18MW. |
Bill O'Connell |
| 9/30/2009 |
Site Characterization Report Approved |
Reviewed report for additional characterization and groundwater monitoring at MarkAir King Salmon. Three new monitoring wells B19MW, B20MW, and B21MW were installed along the western edge of the plume to delineate the extent of groundwater impacts. Soil samples collected during installation of the new wells and groundwater samples collected after well development did not contain detectable concentrations of contaminants, suggesting the extent of the contaminant plume had been sufficiently delineated. Groundwater samples were also collected from wells B14, 15, 16, 17, and 18MW. The DRO concentration in well B14MW decreased from 1.58 mg/l to ND (0.8)however the water level was 1.25 feet lower than the previous event. Contaminant concentrations in wells B17MW and B18MW were consistent with previous events. |
Bill O'Connell |
| 7/8/2010 |
Document, Report, or Work plan Review - other |
Reviewed Product Recovery Report for Markair King Salmon. Product recovery efforts were conducted sporadically from 2008 to 2010 due to inconsistent subcontractor availability in King Salmon. A total of 50-gallons of product was recovered, primarily from well B9MW, which contained up to 5.82 feet of product. The product was disposed of at Emerald Services in Anchorage. |
Bill O'Connell |
| 7/5/2011 |
Document, Report, or Work plan Review - other |
Reviewed work plan for groundwater sampling and free product collection at MarkAir King Salmon. Samples will be collected from 10 wells and analyzed for DRO and BTEX and product levels will be gauged and free product recovered from 5 wells where practicable. |
Bill O'Connell |
| 12/20/2011 |
Document, Report, or Work plan Review - other |
Reviewed 2011 Groundwater Monitoring and Product Recovery Report. Groundwater samples were collected from nine monitoring wells and product was recovered from 4 wells. B16MW could not be sampled due to ponded surface water above the well. Product was recovered from 4 of the 5 wells where it has historically been found. Product thickness ranged from 0.5 feet in B5MW to 8.71 feet in B4MW, and was generally consistent with previous results, however 2.86 feet of product was found in B11MW which previously had only 0.0.1 feet of product during previous sampling efforts. In the nine wells that were sampled, DRO was detected above the Table C cleanup level in one well, B18MW at 11.9 mg/l. The groundwater elevation was significantly higher in 2011 than during previous sampling events which may be responsible for the generally lower contaminant concentrations detected during 2011 sampling |
Bill O'Connell |
| 3/22/2012 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 72857 ASTs, dispensers, piping. |
Bill O'Connell |
| 1/15/2013 |
Document, Report, or Work plan Review - other |
Reviewed Letter Report for Free Product Recovery at MarkAir King Salmon. Ten product recovery efforts were conducted between May and October, 2012. A total of 83 gallon of product were recovered, with the majority (74 gallons) coming from well B9MW, which contained product thickness up to 6.98 feet. Recovered product was either reused on site or transported to Emerald for disposal |
Bill O'Connell |
| 5/13/2013 |
Document, Report, or Work plan Review - other |
Reviewed Free Product Recovery work plan for Mark Air, King Salmon. The objective of this project is to evaluate the product recharge rate and provide recommendations for remedial alternatives. Product thickness will be measured in wells B4MW, B5MW, B9MW, B10MW, and B11MW. The baildown test will be conducted at well B9MW, which has historically contained the greatest amount of free product. Product will be removed from the well using a pump and the recharge monitored every 30 minutes for 8 hours, then again at 24 and 34 hours. Product will also be recovered from the other wells in which it is present. Recovered product will be placed into 55-gallon drums and shipped to Anchorage for disposal. |
Bill O'Connell |
| 7/3/2013 |
Document, Report, or Work plan Review - other |
Reviewed Free Product Recovery Assessment for the former Mark Air Facility. Activities included measuring free product in five monitoring wells and conducting a bail down test in well B9MW. Product was observed in wells B4MW (0.71 ft), B5MW (0.15 ft), B9MW (5.6 ft) and B11MW (0.05 ft). Product was removed from B9MW with a bailer, then depth to product/water was measured over a 24-hour period. The rate of product entering the well dropped off significantly after about 10 minutes. The report estimates that a recovery rate of 0.04 gallons per hour may be achievable for a limited time, indicating an active product recovery system is not feasible. The report recommends installing several large diameter product recovery wells and recovering product manually rather than using a full time automated system. |
Bill O'Connell |
| 5/22/2014 |
Document, Report, or Work plan Review - other |
Reviewed Groundwater Sampling and Free Product Recovery work plan for the former MarkAir King Salmon Site. Groundwater samples will be collected from monitoring wells B12MW – B21MW. Wells containing product will not be sampled; wells without product will be purged prior to sampling. Monitoring wells will be repaired as needed. Free product will be recovered from wells B4MW, B9MW, B10MW, and B11MW during 5 events scheduled at approximately 4 week intervals beginning in June 2014. |
Bill O'Connell |
| 11/25/2014 |
Document, Report, or Work plan Review - other |
Reviewed Groundwater Sampling and Free-Product Recovery report, dated November 25, 2014. Free-product recovery activities were performed 5 times between June 2013 and October 2014. Roughly 36 gallons of product/water mixture were recovered, most of which came from Well B9MW (35 gallons recovered). Groundwater samples were collected from 10 wells that did not have measureable levels of free-product. Well B18MW exhibited a concentration of DRO at 14.9 mg/L. All other groundwater sampling results were below ADEC cleanup levels. Plume appears to be stable; however, free-product continues to be measureable in Wells B4MW, B5MW and B9MW (the level of free-product does not appear to be decreasing in these wells). |
Joshua Barsis |
| 11/9/2015 |
Document, Report, or Work plan Review - other |
Reviewed work plan for Groundwater Sampling and Free Product Recovery at the Former MarkAir Facility in King Salmon, Alaska. The objective of this work is to reduce the amount of free product on the water table and evaluate contaminant trends. Proposed activities include groundwater monitoring of wells B1MW, B2MW, B3MW, B6MW, B7MW, and B10MW through B21MW; monitoring well repairs as needed, and measuring and recovering free product in well B4MW, B5MW, B9MW, B10MW, and B11MW. All work will be performed May 2016 through September 2016. |
Joshua Barsis |
| 12/12/2016 |
Document, Report, or Work plan Review - other |
Reviewed the Groundwater Sampling and Free-Product Recovery report, dated December 5, 2016. Free-product recovery activities were performed 5 times between May and September 2016. Roughly 36 gallons of product/water mixture were recovered, most of which came from Well B9MW (35.5 gallons recovered). Groundwater samples were collected from 14 wells that did not have measureable levels of free-product. Of those, Wells B1MW, B2MW, B7MW, B17MW, and B18MW exhibited concentrations of DRO above the Table C groundwater cleanup levels; Well B7MW had the highest level of DRO at 10 mg/L. All other groundwater sampling results were either below ADEC cleanup levels or not present above detection limits. Well B8MW could not be located and is assumed destroyed. Well B19MW was not sampled because a vehicle was parked over the well. The plume appears to be stable; however, free-product was measureable in Wells B4MW, B5MW, B9MW, B10MW, and B11MW. The groundwater plume does not appear to be bounded to the north. ADEC recommends the following: (1) follow up groundwater sampling and product recovery; and (2) additional monitoring well installation to bound the northern portion of the plume. Further product recovery appears to only be effective at Well B9MW. |
Joshua Barsis |
| 3/23/2020 |
Document, Report, or Work plan Review - other |
Reviewed the Mark Air 2020 Work plan. The plan proposes to collect 16 samples for POL and 4 for PFAS. The plan was approved via email on March 23, 2020. |
Joshua Barsis |
| 5/5/2021 |
Site Characterization Report Approved |
Groundwater samples collected from Wells B1MW (2.90 mg/L), B2MW (30.5 mg/L), B17MW
(10.6 mg/L), and B18MW (5.57 mg/L) contained DRO concentrations which exceed the
applicable ADEC Table C cleanup level of 1.5 mg/L. Benzene (0.0438 mg/L) and
naphthalene (0.0884 mg/L) were also detected in the sample collected from Well B2MW in
excess of the applicable ADEC cleanup levels of 0.0046 mg/L and 0.0017 mg/L, respectively.
The remaining contaminant concentrations were either not detected or were detected at
concentrations less than the applicable ADEC cleanup levels.
The groundwater samples collected from Wells B3MW, B7MW, B13MW, and B20MW and
analyzed for PFAS constituents. PFAS were detected in on-site Wells B3MW (248.4 ng/L)
and B7MW (135.1 ng/L) at concentrations greater than the 70 ng/L EPA LHA action level.
PFAS were also detected in off-site Wells B13MW (3.5 J ng/L) and B20MW (55 ng/L),
however, at concentrations less than EPA LHA action level. |
Lisa Krebs-Barsis |
| 3/28/2023 |
Potentially Responsible Party/State Interest Letter |
Potentially Responsible Party Letter sent to the current leaseholder, Alaska Airlines on this date. |
Naomi Mason |
| 3/30/2023 |
Workplan Requested |
Work Plan request letter sent on this date to Alaska Airlines, work plan due by May 31, 2023. |
Naomi Mason |
| 4/12/2023 |
Site Visit |
Site visit conducted by CSP project manager on this date. Metal detector was used to find missing monitoring well B14MW. BB15MW could not be located, area is used to pile up snow during the winter, so it may have been destroyed. Site photos taken. ADOT representative informed ADEC that construction is planned to begin as early as Fall 2023 to expand the Alaska Airlines terminal to the southeast to the Katmai Air terminal (formerly King Flying Service). The former PenAir terminal to the immediate northwest of Alaska Airlines is now operated by Grant Aviation. |
Naomi Mason |
| 4/24/2023 |
Meeting or Teleconference Held |
Teleconference held on this date between ADEC, Alaska Airlines, and SLR Consulting (SLR) to discuss the upcoming scope of work for the site. ADEC encouraged drinking water well samples from the Alaska Airlines terminal, Grant Aviation terminal, and King Salmon Visitor's Center to be analyzed for petroleum hydrocarbons. Investigation-derived waste (IDW) was also discussed due to the presence of PFAS: GAC filtration and on-site disposal will be suitable for this site. Conducting in-depth groundwater hydrology investigation was also discussed, as well as that VOCs and PAHs have not been ruled out as potential contaminants of concern for this site yet. SLR proposed eliminating some of the northwestern-most wells that have historically been non-detect for this investigation. ADEC agreed that they can be eliminated from this round, but not permanently decommissioned. |
Naomi Mason |
| 5/26/2023 |
Site Characterization Workplan Approved |
ADEC received the Site Characterization Work Plan from SLR Consulting (SLR) on 5/16/2023, ADEC reviewed the work plan and submitted comments on 5/19/2023. The revised work plan was received on 5/25/2023 and was approved by ADEC on this date. During late spring or early summer 2023, SLR plans to conduct groundwater sampling on 17 of the existing 21 monitoring wells and the water well at the Alaska Airlines Terminal. Fluid levels in all the monitoring wells on-site will also be gauged. |
Naomi Mason |
| 4/4/2024 |
Site Characterization Report Approved |
Reviewed/approved the “Site Characterization Report”, dated March 2024. SLR located 15 of the 18 monitoring wells at the site, five of which contained free product. Samples were collected from 10 monitoring wells and one non-potable production well located approximately 200 feet southeast of the site that serves the public restroom at the Alaska Airlines Terminal. Free product thickness ranged from 0.01 feet in B4MW to 0.25 feet in B9MW. Product skimmers in wells B4MW, B5MW, and B9MW were full and the skimmer in B11MW was partially full. Total product removed from the wells was less than 1 gallon. Diesel Range Organics (DRO), Residual Range Organics (RRO), benzene, and naphthalene were detected above the cleanup levels in one or more samples with exceedances detected in B1MW, B2MW, B17MW, and B18MW. Concentrations were lower than in samples collected in 2020. Contaminants were below cleanup levels in the sample from the non-potable well. Historical groundwater analytical data were evaluated for statistically significant temporal trends using a Mann-Kendall trend test. The report concludes the dissolved phase and free product plumes are stable or decreasing, which is true, based on only those monitoring wells that have been evaluated. Other wells have not been sampled, nor free product measured in recent monitoring events. Additionally, there is insufficient data, for some monitoring wells, to establish any trends. |
Stacee Henderson |
| 5/28/2024 |
Long Term Monitoring Workplan or Report Review |
Reviewed/approved the revised Long-Term Monitoring Plan (LTMP), dated May 14, 2024. The objective of the LTMP is to track the ongoing natural attenuation of hydrocarbon contamination within the existing well network at the Site. Fluid levels will be gauged, and free product removed to the extent practical every two years with the first event occurring in 2024. Groundwater samples will be collected every fourth year with the first event occurring in 2024. Following the 2024 long-term monitoring event, fluid level gauging and free product removal will be conducted in 2026, with the next groundwater sampling event scheduled for 2028. A groundwater monitoring report will be submitted to ADEC after each groundwater sampling event, every fourth year, and a brief fluid level and product recovery report, every other year. |
Stacee Henderson |
| 11/8/2024 |
Site Characterization Report Approved |
Approved the 2024 Long Term Monitoring Groundwater Report, dated October 2024. The ADEC generally concurs that the dissolved phase and free product plumes may be stable or decreasing for only those monitoring wells that have been evaluated. Five wells contained free product and thickness ranged from 0.01 feet in B4MW to 3.7 feet in B9MW. Total product removed from the wells was approximately 2.8 gallons, with 2-gallons from B9MW. DRO, benzene, and naphthalene were detected above the cleanup levels in one or more samples with exceedances detected in B1MW, B2MW, B17MW, and B18MW. Samples for RRO were not collected or analyzed. Fluid level gauging and free product removal will be conducted in 2026, with the next groundwater sampling event scheduled for 2028. |
Stacee Henderson |
