Site Report: Dutch Hbr-Rocky Point Lower Tank

Site Name:	Dutch Hbr-Rocky Point Lower Tank
Address:	East Point Road, Unalaska, AK 99685
File Number:	2542.38.018
Hazard ID:	512
Status:	Active
Staff:	Sarah Bernhardt, 9072697527 sarah.bernhardt@alaska.gov
Latitude:	53.884729
Longitude:	-166.531523
Horizontal Datum:	WGS84

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.

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

Diesel fuel, jet fuel, gasoline and bunker "C" from fuel spills associated with current operations and dating back to World War II have contaminated soil, groundwater and ponds in the area. Petroleum sheen used to discharge into Iliuliuk Bay near the APL dock before the dock area was expanded in 1994 and a sheet-pile bulkhead was built. This area is shared responsibility (multiple potentially responsible party (PRP)) site involving the US Army Corps of Engineers (because it is a formerly used defense site (FUDS)), Chevron and Delta Western Fuels. Bruce Erickson, Mike Lewis and Jennifer Roberts are former site managers. The military built Dutch Harbor Naval Operating Base including large tank farms and fuel distribution systems during World War II. Executive order (EO) 8786 dated June 14, 1941 revoked releasing lands to public domain and after the war the federal government continued to own the property until 1974. During this time it leased the fuel facilities to Standard Oil and Chevron. In 1975 the surface rights and facilities were transferred to the Ounalashka Corporation (OC) and subsurface rights went to the Aleut Corp. OC continued to lease the fuel system related portions of the site to Chevron and later Delta Western. American President Lines currently lease portions of the former NOB from the OC. See also Reckey 1981260113501 "DOT/PF Dutch Harbor airfield" and Reckey 1988260107101 "Delta Western Bulk Plant - Dutch Harbor". Two bulk fuel tank farms are currently operated by Delta Western on Rocky Point, the "Upper" or "Working Tank Farm" on the top of the hill and the Rocky Point tank farm or "Lower Tank Farm" (Tanks 1-11) at the base of the bluff adjacent to APL's yard. Four large concrete USTs (~1 million gallons each) were installed and operated on Rocky Point Tank Hill during WWII and are still located between the Upper and Lower Tank Farms. Standard Oil, now Chevron, and Delta Western have leased and operated the tanks and land from the federal government and later from OC since the late 1940s.

Action Information

Action Date	Action	Description	DEC Staff
3/4/1994	Update or Other Action	ADEC received a report from APL documenting installation of a sheet pile bulkhead as part of its dock expansion. Based on coordination with DEC, they installed an oil/water separator inland from the bulkhead to collect free phase petroleum hydrocarbons from the groundwater surface. The bulkhead was expected to serve as a cut-off wall which would stop the petroleum sheens into the bay.	John Halverson
10/31/1997	Site Characterization Workplan Approved	ADEC approved a site investigation workplan for the Rocky Point tank farm. The investigation was being done under a cost sharing agreement between Chevron, Delta Western and the Corps of Engineers. Several years of negotiation and debate preceded the interim agreement. Plan called for test pits around and downgradient from the tanks near APL. Negotiations are continuing on the larger Rocky Point area that needs investigation and cleanup.	John Halverson
5/26/1998	Update or Other Action	ADEC received the Subsurface Investigation Report Delta Western/Former Chevron Bulk Plant E100-1428 at Rocky Point Amaknak Island, Dutch Harbor, dated May 1, 1998. It summarized soil and groundwater contamination (elevated DRO and RRO, some free product below the water table) around the Rocky Point tank farm. Additional characterization is necessary to define the extent of impact and evaluate cleanup alternatives.	John Halverson
9/30/1998	Update or Other Action	Notice of intent to recover costs for ADEC oversight were issued to Chevron and Delta Western.	John Halverson
6/4/1999	Site Characterization Workplan Approved	ADEC conditionally approved the Site Characterization Workplan - Rocky Point Management Area #1, dated May 1999 (Foster Wheeler). Several ADEC comments on the draft workplan were not addressed adequately and responsible parties were informed they may need to undertake additional investigation later.	John Halverson
9/17/1999	Update or Other Action	ADEC received a Site Characterization Data Transmittal - Rocky Point Management Area #1, Amaknak Island, dated September 15, 1999 (RRM). It provides data from the site characterization, but no narrative or evaluation of the data.	John Halverson
9/23/1999	Update or Other Action	ADEC received and approved a groundwater monitoring workplan (letter) from Foster Wheeler Environmental Corp., for sampling in September 1999. Results to be provided in a letter report.	John Halverson
2/12/2000	Update or Other Action	ADEC received the Rocky Point Monitoring Program 3rd Quarter Data Report, February 2001, by Jacobs Engineering. It documents groundwater monitoring done in August 2000 and surface water seep sampling done in October 2000.	John Halverson
8/30/2000	Long Term Monitoring Established	Delta Western and the Corps to implement quarterly groundwater monitoring.	John Halverson
9/15/2000	Update or Other Action	ADEC sent a letter to Chevron, Delta Western and the Corps commenting on the draft Phase I Site Characterization Report, prepared by Foster Wheeler, August 11, 2000. The draft report documents high levels of petroleum contamination in the thermal treatment area, in the APL yard where a 3" diameter fuel line was found to be leaking in ~1993, in a ravine on top of tank hill between UST 14 and 15, and in various locations along the fuel lines. Comments on the draft report need to be addressed, the report finalized and a Phase II site characterization effort is being planned.	John Halverson
10/10/2000	Update or Other Action	Staff reviewed and commented on a draft Phase II Site Characterization Workplan. Several comments were provided that needed to be addressed before receiving ADEC approval. In general, the plan called for installing several more monitoring wells and drilling and sampling several soil borings to better delineate the extent of contamination. The Phase I report was not finalized, but agreement was reached that the results from Phase I and II would be combined into one report.	John Halverson
4/11/2001	Update or Other Action	Staff reviewed and commented on the draft Phase I/II Site Characterization Report dated 2/28/01. Many issues were identified that need to be clarified and resolved in the report before it can be approved as meeting the site characterization requirements.	John Halverson
5/16/2001	Update or Other Action	ADEC received the Fourth Quarter 2000 and First Quarter 2001 Groundwater and Surface Water Monitoring Results Rocky Point Management Area 1 report, prepared by Delta Environmental Consultants. It documents groundwater monitoring done in January and April 2001. Petroleum contaminated groundwater documented at concentrations ranging up to 1,200 mg/l DRO and 27.4 mg/l GRO.	John Halverson
8/6/2001	Update or Other Action	ADEC received the Rocky Point Groundwater Monitoring Data Report (June 2001 Sampling Event), dated August 2001. The report documents water level measurements and analytical results from sampling at 17 monitoring wells throughout the site. Varying levels of petroleum contamination are documented in groundwater ranging up to 3.6 mg/l DRO and 2.2 mg/l GRO (significantly lower than the January and April sampling, however, these latest samples were collected using a peristaltic pump rather than a bailer).	John Halverson
12/7/2001	Update or Other Action	Staff reviewed and commented on the revised draft Phase I/II Site Characterization Report dated July 27, 2001. Numerous issues still need to be resolved in the report.	John Halverson
3/26/2002	Update or Other Action	DEC received the Quarterly Groundwater Monitoring Program - February 2002 Sampling Event - report on the Pre WWII Tank Farm and Rocky Point, dated March 2002, by Jacobs Eng.	John Halverson
4/22/2002	Update or Other Action	DEC received a draft data report - Rocky Point Groundwater Monitoring Program, September 2001 Sampling Event, dated December 2001, by Jacobs Engineering.	John Halverson
5/16/2002	Site Characterization Report Approved	DEC received the Final Phase I/II Site Characterization Report for Rocky Point Management Area #1, dated May 15, 2002, by Foster Wheeler. The report documents the site history and prior site characterization work. The report recommends interim removal actions at the lower APL area and between the thermal treatment area and East Point Road; a focussed feasibility study on the Pete's Creek area, thermal treatment area, and around Building 575; further characterization was recommended for Pete's Creek, Strawberry Hill (Tank 17-18 Area, Building 627 and Tar Pond A); on-going monitoring was recommended for the lower tank farm. It recommends preparing a closure report for the Upper Tank Farm Area.	John Halverson
6/21/2002	Update or Other Action	DEC received the Groundwater Monitoring Program 2001 Annual Report for the Pre-WWII Tank Farm and Rocky Point, dated June 2002, by Jacobs Engineering.	John Halverson
7/3/2002	Update or Other Action	Staff reviewed and commented on a draft Phase III Site Characterization Workplan. Several clarifications were requested.	John Halverson
7/9/2002	Update or Other Action	DEC received the Pre-WWII Tank Farm / Rocky Point Quarterly Groundwater Monitoring Report, May 2002 Sampling Event, by Jacobs Engineering.	John Halverson
1/23/2003	Site Added to Database	Rocky Point expanded into nine unique sites from one.	John Halverson
5/15/2003	Update or Other Action	DEC received the draft Phase III Site Characterization Report for Rocky Point Management Area #1, dated May 5, 2003, by Tetra Tech FW. The report recommends continued groundwater monitoring in the lower tank farm area, but no active cleanup.	John Halverson
12/31/2003	Update or Other Action	DEC received the Groundwater Monitoring Program 2002 Annual Report for the Pre-WWII Tank Farm and Rocky Point, dated December 2003, by Jacobs Engineering.	Meghan Dooley
9/23/2004	Update or Other Action	DEC received the Groundwater Monitoring Program 2003 Annual Report for the Pre-WWII Tank Farm and Rocky Point, dated September 2004, by Jacobs Engineering.	Meghan Dooley
3/16/2005	Update or Other Action	DEC approved the draft Semi-annual Groundwater Monitoring Report - 1st Half 2004 for the Rocky Point Management Area #1.	John Halverson
6/10/2005	Update or Other Action	File number issued 2542.38.018.	Aggie Blandford
5/17/2006	Cleanup Level(s) Approved	DEC approved alternative cleanup levels for the Rocky Point Management Area #1. A prior determination was made that groundwater beneath the site is not a current or potential future drinkingwater source (18 AAC 75.350) and approved use of ten times the groundwater cleanup levels as long as groundwater discharging into nearby surface waters does not cause a violation of Alaska water quality standards. Alternative soil cleanup levels were calcutated using method 3 in 18 AAC 75.340. The resulting migration to groundwater values for DRO and RRO exceeded the method two ingestion cleanup levels and the GRO value exceeded the maximum allowable concentration (1400 mg/kg) in Table B-2. Therefore, the following alternative soil cleanup levels were approved: 8,250 mg/kg DRO, 8,300 mg/kg RRO, and 1,400 mg/kg GRO. The approval letter noted the requirement for DEC approval prior to moving any contaminated soil (exceeding method 2 migration to groundwater levels) off-site.	John Halverson
5/17/2006	Update or Other Action	DEC conditionally approved an addendum to the 2004 Groundwater Monitoring Workplan for the Rocky Point Management Area. DEC requested samples of NAPL be collected from any MWs that contain NAPL which has not been previously sampled and analyzed to determine the type and extent of weathering of the product.	John Halverson
5/23/2006	Update or Other Action	DEC conducted a site inspection of the Rocky Point Management Area with ChevronTexaco, Delta Western, Army Corps of Engineers, SECOR, and Ounalshka Corp. Delta Western's new pipelines design work is done, supports are being surveyed in this week, plan to have a crew installing/welding pipe in ~2 weeks. Inspected pipeline route and surrounding area. Contaminated soil stockpile from the Tank 12 line leak is adjacent to road on the hillside - needs additional netting to secure the cover. Inspected valve houses - the two closest to the fuel dock have a strong fuel odor and sheen/product on water in them. Discussed plan to isolate, clean and conduct maintenance on the valves in each followed by weekly inspections. Inspected the interception trench for product recovery along East Pt. Road; water level flucuating to extent booms don't stay in contact with the watertable - needs resolution. Sump for biocell #2 needs to be drained - biocell may not be draining properly because sump is full of water.	John Halverson
11/17/2006	Update or Other Action	SECOR developed a "Focused Feasiblity Study for Pipeline Closure Project, Rocky Point Management Area" on behalf of Chevron. The study recommends uncovering, cleaning and purging all inactive pipelines; removing inactive lines where feasible; cleaning and removing appurtenent facilities (valve houses, pumphouses, ect.); removing a limited amount of soil (up to 3' from the lines) to allow project completion without having to chase contaminated soil - will come back to fully characterize and cleanup as needed; clean and abandone in place lines where removal is unsafe or not practicable; and collect soil samples at 50' intervals along pipelines.	John Halverson
7/17/2007	Cleanup Plan Approved	DEC approved a Pipeline Closure Workplan for Rocky Point Management Area. The plan calls for draining, cleaning and removing (unless safety concerns warrant in place closure of sections) all inactive fuel pipelines at Rocky Point, characterizing soil along the pipeline coordidors, removing contaminated soil located within 3' of the lines and stockpiling it for treatment next year. Cleanup of contaminated soil extending beyond 3' from the pipelines will be incorporated into the overall site cleanup plan scheduled for 2008.	John Halverson
3/5/2008	Update or Other Action	DEC received the "Semi-Annual Groundwater Monitoring and Operations and Maintenance Report - First Half 2007" from SECOR on behalf of Chevron. LNAPL continues to be observed in MWRP-22, MWRP-24, MWRP-28, MW-2 and MW-13; samples were not collected from these wells for laboratory analysis. Water samples from MWRP-33 and PC-2 continue to exceed the cleanup levels. Water samples were collected from the tunnels into tanks 12, 13, 17 and 18, valve house A, and two brick structures thought to be heater pits; water from these structures contains elevated concentrations of DRO, RRO, PAHs, and/or BTEX. The bioventing system on tank hill was not operating - it had been shut off for the winter and the power line was cut by a plow; based on a review of past performance data SECOR recommended discontinuing operation of the system and development of an alternative cleanup option. Soil in biocells 1 and 2 and the stockpile from Tank 2 was characterized, met cleanup levels, and the cells were decommissioned; the treated soil was stockpiled for use as on-site backfill during the pipeline closure project. The top 4 feet of soil in the Tank 12 Stockpile was sampled and met the site cleanup levels; the top 4 feet can be removed and used as on-site backfill and then the remainder of the stockpile needs to be characterized. Sorbent booms in the interception trench were changed out during the first quarter and were still in good condition during the second quarter.	John Halverson
5/30/2008	Exposure Tracking Model Ranking	Initial ranking with ETM completed.	Evonne Reese
6/30/2008	Update or Other Action	DEC received the "2007 Pipeline Closure Documentation Report..." prepared by Stantec on behalf of Chevron. The report documents work done to properly close abandoned fuel pipelines at the Rocky Point Tank Farm area. Approximately 18,200 lineal feet of pipeline was identified for closure in the workplan; an additional 10,021 feet of pipeline was identified during the fieldwork. A total of 18,021 feet of pipeline was removed. Site characterization and limited soil removal were conducted. Some of the valve houses were also cleaned and demolished. Two underground brick structures thought to be part of heater-pits were found to be transformer vaults; the transfomers were removed, sampled, determined to be non-PCB transformers and disposed of off-site; trace levels of PCB were found in water from one vault. Due to the increase in the amount of piping determined to be present, additional closure will be conducted in 2008.	John Halverson
1/23/2009	Update or Other Action	Stantec submitted a report titled "Documentation Report for Waste Management and Assessment During Electrical Conduit Excavation and Assessment for Tank 2" on behalf of Chevron. The report documents work conducted in 2006. SECOR was hired to conduct sampling analysis and waste management during installation of an electrical line from East Point Road behind the lower tank farm to a new fuel pumphouse. Several fuel pipelines were encountered and are depicted in a figure in the report. LNAPL was observed in in a several locactions including in soil ~500' from the start of the trench and in groundwater seepage into the trench at ~570', 630', 675' and 700' from the start of the trench. The product was reported as appearing Bunker C-like material. Petroleum contaminated soil from the excavation was segregated and stockpiled in the Thermal Treatment area (Tank 2 Stockpile). Soil samples collected from the electrical line trench and test pits around Tank 2 did not contain petroleum at levels above the site specific cleanup levels (8,250 mg/kg DRO, 8,300 mg/kg RRO, and 1,400 mg/kg GRO).	John Halverson
3/30/2009	Update or Other Action	DEC received a copy of the "Semi-Annual Area Wide Groundwater Monitoring Report and O&M Report - First Half 2008" from Stantec, on behalf of Chevron. The report documents groundwater level and flow directions, generally stable or decreasing petroleum concentrations in groundwater, the presence of measurable LNAPL in 9 out of 61 monitoring wells that were gauged, residual petroleum contaminated water access tunnels to abandoned underground storage tanks 16, 17 and 18, and work done to maintain and evaluate the interception trench/product recovery system and the oil water separator system.	John Halverson
6/4/2009	Interim Removal Action Approved	DEC received the 2008 Pipeline Closure Report for the Rocky Point Management Area, prepared by Stantec for Chevron. The report documents removal or in-place closure of 23 pipelines (332 linear feet (LF) of above ground lines and 9,098 LF of below ground lines). Approximately 7,000 LF of pipe was removed from the ground and 2,400 LF closed in place. Approximately, 16,185 gallons of residual fuel were removed from the piping. Over 101,000 gallons of contaminated water from decontamination and dewatering activities were treated on-site and discharged. Over 400 soil samples were collected and analyzed. Eight appertenant structures (valve houses, pump houses, etc.) were cleaned and removed. Approximately 6,000 LF of inactive pipeline have been identified for future closure.	John Halverson
7/31/2009	Update or Other Action	DEC received the "Semi-Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - Second Half 2008", from Stantec on behalf of Chevron. 59 monitoring wells were gauged for water level data and 33 MWs were sampled. Samples from three MWs exceeded the cleanup levels for groundwater discharging into surface water; the 30 other MWs did not exceed cleanup levels of 10 times the Table C levels (samples from 5 MWs exceeded the Table C levels). Eight MWs (four of which are in the Pre WWII Tank Farm Area {MW-2, MW-11, MW-13 and MW-16} and four within the Thermal Treatment Area {MWRP-22, MWRP-24, MWRP-28 and IWPZ-07}) contained measurable LNAPL and were not sampled. LNAPL thickness ranged from 0.04' to 2.78'. 5.85 liters of product were removed from the MWs in the Thermal Treatment area. Product mobility and recoverability are being evaluated. Five tank tunnels and ten valve houses have been inspected and water samples collected from them over time. Nine of the valve houses were removed during 2007-08; valve house H remains - no water was present in valve house H during the quarterly inspections. The tank tunnels were not sampled during the 2nd half of 2008. The bioventing system on Tank Hill remained off pending development of an alternative cleanup plan. Sorbent booms in the interception trench and on-site oil water seperator were inspected and replaced as necessary. Soil from the remainder of the Tank 12 stockpile was sampled, met cleanup levels and was moved to a stockpile for beneficial use as on-site fill material.	John Halverson
8/27/2009	Update or Other Action	Note to file 8-27-09. As per John Halverson I am cross-referencing five documents: 1. Phase 2 Characterization Workplan for East Point/Ballyhoo Road Rehabilitation Unalaska March 2000, Golder Associates; 2. Draft Phase 2 Site Characterization Unalaska: East Point/Ballyhoo Rd. Rehabilitation April 2001, Golder Associates; 3. Preliminary Engineering Study for the Relocation of Pipelines at The Dutch Harbor Facility, Unalaska; November 2001, Hattenburg & Dilley Engineering Consultants; 4. Phase 2 Site Characterization Unalaska: East Point/Ballyhoo Rd. Rehabilitation June 2003, Golder Associates; and 5. Corrective Action Plan for Unalaska: East Point/Ballyhoo Rd. Rehabilitation Unalaska December 2003, Golder Associates. These five documents are associated with the file number 2542.38.030 which is listed in the FileRoom database but not listed in the CS database. These five documents are filed in the CS files, in Anchorage, under file number 2542.38.030. This note will be placed in the three Hazard ID #’s: 509, 510, and 512 under CS file number 2542.38.018.	Pam Clemens
6/23/2010	Update or Other Action	The Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2009 was recieved to ADEC. The report addressed groundwater contamination in the Rocky Point Management Area as well as maintenance of structures associated with the remedy. During the first half of 2009, 62 wells were gauged for LNAPL thickness and groundwater depth. Samples were collected from 32 wells and 5 wells exceeded cleanup levels for surface water. Eight wells had residual or measurable thickness of LNAPL, however some of these contained Bunker-C like material and were not removed. In second half 2009, 4 wells were installed during the Site Assessment and incorporated into the groundwater monitoring program. Monitoring was discontinued at Well PC-01 as a new well was installed in the area. Seven wells that were gauged had residual or measurable free product, one of these containing Bunker-C. The installation of MWRP-37 in the APL operations area called for recovery of 83.28 L of product. 57 wells were gauged and 32 were sampled in the second half of 2009. Five wells exceeded surface water cleanup levels in tank Hill area, Petes Creek, APL operations, and Thermal Treatment Area. O&M activities were performed on the OWS, the interceptor trench, tank tunnels, and the sedimentation basin. Boom was replaced as needed.	Meghan Dooley
8/20/2010	Update or Other Action	ADEC received the 2009 Site Assessment Documentation Report. A total of 106 locations were sampled with UVOST/LIF in the Rocky Point Managment Area to characterize extent of soil contamination. Four monitoring wells were installed and incorporated into the groundwater monitoring program. Soil samples indicated concentrations of light end constituents such as GRO, benzene, ehtylbenzene, and totals xylenes above cleanup levels at the Lower Tank Farm and APL operations area. Two of the four wells were installed in this area, and MWRP-37 had LNAPL at a thickness greater than 6 feet.	Meghan Dooley
12/19/2013	Update or Other Action	Electronic submittal recieved: Work Plan for Installation of Recovery and Monitoring Wells, Lower Tank Farm Area.	Meredith Savage
1/24/2014	Document, Report, or Work plan Review - other	ADEC sends out comments on Work Plan for Installation of Recovery and Monitoring Wells, Lower Tank Farm. The scope of work for this plan is to install a light nonaqueous-phase liquid (LNAPL) recovery well and two groundwater monitoring wells in the vicinity of monitoring well MWRP-37. MWRP-37 is located in the northwest section of the area known as the Lower Tank Farm, within the Rocky Point Mangement Area, on the SE side of Amaknak Island.	Meredith Savage
5/21/2014	Document, Report, or Work plan Review - other	Response to comments received electronically on 4/25/2014. ADEC responds on 5/21/2014 with additional comments and requests final version of Work Plan.	Meredith Savage
8/7/2014	Document, Report, or Work plan Review - other	Received on July 24, 2014: Final Work Plan for Installation of Recovery and Monitoring Wells, Lower Tank Farm Area, Rocky Point Management Area, Dutch Harbor, Unalaska, Alaska. Final approval of the work plan sent out on August 7, 2014.	Meredith Savage
3/16/2015	Document, Report, or Work plan Review - other	Final copy of the 2013 Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report received January 6, 2015. The report provides the results of semi-annual groundwater monitoring events conducted June, September, and December 2013. 51 out of 59 groundwater monitoring wells were gauged to measure depth to groundwater, total well depth, and note presence of any light non-aqueous phase liquid (LNAPL). LNAPL was recovered from 7 wells during the June monitoring event, from 4 wells during the September event, and from 2 wells during the December monitoring event. Groundwater samples were collected from 36 of 41 wells scheduled for monitoring during the June event and from 19 of 26 wells scheduled for monitoring during the December event; analysis included DRO, GRO, BTEX, and PAHs. Out of the 36 samples from June cleanup levels were exceeded for DRO in wells PC-02 (alternative cleanup levels), MWRP-18, MWRP-25, MWRP-28, MWRP-39, TW-03, PC-02, SV-01, MWCV-03, and MWCV-04; for benzene MWRP-05 and MWRP-38; and for lead in MW-05. Of the 19 December samples cleanup levels were exceeded for DRO in wells MWRP-28 (alternative cleanup levels), MWRP-11, MWRP-25, MWRP-28,MWRP-29, MWRP-39, TW-02, TW-03, PC-02, and SV-01; and for lead and benzene in well MWRP-05. Results of the monitored natural attenuation (MNA) evaluation suggest that subsurface conditions are generally favorable for intrinsic biodegradation of petroleum hydrocarbons by anaerobic degradation.	Meredith Savage
6/27/2016	Document, Report, or Work plan Review - other	Approved the “Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2014” for the RPMA. In 2016, Stantec will attempt to locate and repair damaged monitoring wells within the RPMA monitoring well network. Sentinel monitoring well MWRP-03 in the Lower Tank Farm had a DRO detection below cleanup levels; DRO concentrations in well MWRP-03 have been decreasing since 2012.	Holly Weiss-Racine
11/4/2016	Document, Report, or Work plan Review - other	Approved the “Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2015” for the RPMA. In 2016, Stantec will attempt to locate and repair damaged monitoring wells within the RPMA monitoring well network.	Holly Weiss-Racine
5/31/2017	Update or Other Action	ADEC received the “Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2016” for the RPMA by Stantec on behalf of Chevron and Delta Western.	Linda (Qi) Liu
11/3/2017	Document, Report, or Work plan Review - other	ADEC received, commented and approved "Sampling and Analysis Plan for Groundwater Monitoring and Operations and Maintenance" for RPMA area. The plan was submitted by Stantec on behalf of Chevron and Delta Western.	Linda (Qi) Liu
7/2/2018	Update or Other Action	ADEC received the “Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2017” for the RPMA by Stantec on behalf of Chevron and Delta Western.	Rachael Petraeus
4/19/2019	Update or Other Action	ADEC received the “Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2018” for the RPMA by Stantec on behalf of Chevron and Delta Western. The dominant groundwater flow directions from Tank Hill are to the southeast toward the Lower Tank Farm Area and to the northwest toward the Pre-World War II Tank Farm. Groundwater flow direction in the TTA is to the west until it turns and runs generally north, parallel to Ilulaq Lake. Results of historical MNA evaluations suggest that subsurface conditions are generally favorable for intrinsic biodegradation of petroleum hydrocarbons by anaerobic degradation, which is likely contributing to some reduction in petroleum hydrocarbon concentrations.	Rachael Petraeus
9/27/2019	Update or Other Action	On September 27, 2019 ADEC received the "Rocky Point Management Area Semi-Annual Groundwater Monirtoring & O&M" transmittal letter dated September 27, 2019. The letter documents a request that, effective this year, one annual groundwater sampling event in May is appropriate rather than two semi-annual groundwater sampling events. ADEC approves the request. A review of the historical site data indicates that groundwater monitoring events in the Rocky Point Management Area have a long-term trend of concentrations showing little variability due to seasonal impacts. However, if new site groundwater monitoring results indicate increasing concentrations or changes in concentration variability at the groundwater monitoring wells sampled as part of the annual monitoring program, ADEC will request modifications in sampling frequencies in the future.	Rachael Petraeus
1/28/2020	Update or Other Action	ADEC received the transmittal letter "Rocky Point Management Area Weir Inspection Activities" dated December 20, 2019. The letter documents a request that , effective January 1, 2020, monthly weir inspections be completed for Tanks 12, 13, 16, 17 and 18 the Dutch Harbor Rocky Point Tank Farm rather than weekly weir inspections. ADEC approves the request for a 2 year period, with a requirement to assess water sample results taken during that time to determine if there is data variability in the water samples due to concentration fluctuations or sampling method. ADEC requests to include these water samples results in the annual groundwater monitoring reports. In addition, if new site inspection results indicate an observance of water with sheen being discharged from any of the tank tunnels and/or sample results indicate changes in concentration variability at the groundwater monitoring wells sampled, ADEC will request modifications in sampling frequencies in the future.	Rachael Petraeus
8/11/2021	Document, Report, or Work plan Review - other	Bulk action for all sites within the Rocky Point Management Area Operational Area Boundaries. ADEC received the Annual Area-Wide Groundwater Monitoring and Operation and Maintenance Report – 2020 for the Rocky Point Management Area in Dutch Harbor, Unalaska on May 26, 2021. Activities included inspection and maintenance of the Thermal Treatment Area (TTA) oil-water separator (OWS) and sedimentation basin; the East Point Loop Road (EPLR) OWS and sedimentation basin; and the TTA groundwater interceptor trench, collection vaults, and surface water drainage culverts. Light nonaqueous-phase liquid (LNAPL) recovery O&M activities at monitoring wells MWRP-24 and MWRP-37 are ongoing, and in 2020 were conducted on a monthly basis at monitoring well MWRP-24 and on a weekly basis at monitoring well MWRP-37. The frequency of the groundwater monitoring and O&M activities at the Rocky Point Management Area (RPMA) was reduced from semiannual to annual in 2019. ADEC recommends MWRP-15 is added to the list of wells to be sampled for Diesel Range Organics (DRO), Gasoline Range Organics (GRO), and Polycyclic Aromatic Hydrocarbons (PAHs). Additionally, ADEC requests some recommendations are provided regarding the access to monitoring wells, particularly those with free product historically observed. Several wells were unable to be sampled due to being located under shipping containers. Responses sent on July 16, 2021.	Cascade Galasso-Irish
7/7/2022	Document, Report, or Work plan Review - other	Bulk action entry for the RPMA - ADEC received the Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report – 2021 Rocky Point Management Area Dated April 2022. The 2021 annual groundwater monitoring and operations and maintenance (O&M) activities included inspection and maintenance of the Thermal Treatment Area (TTA) oil-water separator (OWS) and sedimentation basin; the East Point Loop Road (EPLR) OWS and sedimentation basin; and the TTA groundwater interceptor trench, collection vaults, and surface water drainage culverts. Annual groundwater monitoring is conducted at the Rocky Point Management Area (RPMA), and O&M operations also include the ongoing light non-aqueous phase liquid (LNAPL) recovery at wells MWRP-24 and MWRP-37, which are conducted monthly. Due to project organization changes since the last work plan was approved in 2017, ADEC requests an updated work plan will be provided to ADEC for review and approval prior to the 2023 field efforts. In future reporting, ADEC requests the hazardous wastes and contaminated media derived from the RPMA groundwater monitoring are catalogued and a Transport, Treatment and Disposal form is provided to ADEC for review and approval in accordance with 18 AAC 75.325(i) when the wastes are transferred to a final destination. Per comment resolution, ADEC no longer supports discharge of purge water to the ground surface without granular activated carbon (GAC) treatment or being containerized and disposed of off-site. ADEC may approve foregoing soil sampling at this time if groundwater is handled appropriately in subsequent annual sampling. However, prior to site closure, soil sampling will need to occur to verify residual contamination is below current cleanup levels. ADEC concurs with the recommendations for the 2022 season in the cover letter submitted with the 2021 report. ADEC approved the final report on this date.	Cascade Galasso-Irish
4/10/2023	Document, Report, or Work plan Review - other	Bulk action entry for the Lower Tank Site and MWRP-37. DEC reviewed and approved the Product Recovery Report 2022 RPMA on this date. DEC agrees with the continued product recovery recommended at MWRP-24 and MWRP-37; and wells IWPZ-07, MWRP-22, and TW-02 to be removed from the product recovery operations and added to the annual groundwater sampling program if no product is observed in the wells in 2023. This tech memo is a supplemental document to the 2022 annual reporting and will be added as an appendix for final approval.	Cascade Galasso-Irish
4/20/2023	Document, Report, or Work plan Review - other	Bulk action entry for RPMA sites - on this date, DEC received and approved the 2022 Final Annual Area-Wide Groundwater Monitoring and Operation Maintenance Report for the Rocky Point Management Area, Dutch Harbor, Unalaska, Alaska. This document also includes the 2022 Well Status Report (Appendix E), the 2022 Cut and Cover Tank Tunnel Surface Water Trend Analysis (Appendix F), and the 2022 Product Recovery Tech Memo (Appendix G). The document has been filed under the sitewide RPMA file, Rocky Point Tank Hill, Hazard ID 509.	Cascade Galasso-Irish
6/2/2023	Document, Report, or Work plan Review - other	On this date, DEC reviewed and approved the Final Sampling and Analysis Plan, Area-Wide Groundwater Monitoring and Operation and Maintenance Sampling and Analysis Plan, Rocky Point Management Area, Unalaska, Alaska.	Cascade Galasso-Irish
1/30/2024	Document, Report, or Work plan Review - other	Bulk action entry for annual RPMA groundwater monitoring sites - DEC received the Annual Area-Wide Groundwater Monitoring and Operation and Maintenance Report – 2023 for the Rocky Point Management Area in Dutch Harbor, Unalaska. DEC agreed with all recommendations, including another attempt to sample MWRP-08 and -09 to monitor if concentrations in Tank Tunnel 17 are migrating to the bay. DEC had no other comments and requested the final document for review once the product recovery memo and weir inspection reports are completed and appended to the document.	Cascade Galasso-Irish

Action Date

Action

Description

DEC Staff

3/4/1994

Update or Other Action

ADEC received a report from APL documenting installation of a sheet pile bulkhead as part of its dock expansion. Based on coordination with DEC, they installed an oil/water separator inland from the bulkhead to collect free phase petroleum hydrocarbons from the groundwater surface. The bulkhead was expected to serve as a cut-off wall which would stop the petroleum sheens into the bay.

John Halverson

10/31/1997

Site Characterization Workplan Approved

ADEC approved a site investigation workplan for the Rocky Point tank farm. The investigation was being done under a cost sharing agreement between Chevron, Delta Western and the Corps of Engineers. Several years of negotiation and debate preceded the interim agreement. Plan called for test pits around and downgradient from the tanks near APL. Negotiations are continuing on the larger Rocky Point area that needs investigation and cleanup.

John Halverson

5/26/1998

Update or Other Action

ADEC received the Subsurface Investigation Report Delta Western/Former Chevron Bulk Plant E100-1428 at Rocky Point Amaknak Island, Dutch Harbor, dated May 1, 1998. It summarized soil and groundwater contamination (elevated DRO and RRO, some free product below the water table) around the Rocky Point tank farm. Additional characterization is necessary to define the extent of impact and evaluate cleanup alternatives.

John Halverson

9/30/1998

Update or Other Action

Notice of intent to recover costs for ADEC oversight were issued to Chevron and Delta Western.

John Halverson

6/4/1999

Site Characterization Workplan Approved

ADEC conditionally approved the Site Characterization Workplan - Rocky Point Management Area #1, dated May 1999 (Foster Wheeler). Several ADEC comments on the draft workplan were not addressed adequately and responsible parties were informed they may need to undertake additional investigation later.

John Halverson

9/17/1999

Update or Other Action

ADEC received a Site Characterization Data Transmittal - Rocky Point Management Area #1, Amaknak Island, dated September 15, 1999 (RRM). It provides data from the site characterization, but no narrative or evaluation of the data.

John Halverson

9/23/1999

Update or Other Action

ADEC received and approved a groundwater monitoring workplan (letter) from Foster Wheeler Environmental Corp., for sampling in September 1999. Results to be provided in a letter report.

John Halverson

2/12/2000

Update or Other Action

ADEC received the Rocky Point Monitoring Program 3rd Quarter Data Report, February 2001, by Jacobs Engineering. It documents groundwater monitoring done in August 2000 and surface water seep sampling done in October 2000.

John Halverson

8/30/2000

Long Term Monitoring Established

Delta Western and the Corps to implement quarterly groundwater monitoring.

John Halverson

9/15/2000

Update or Other Action

ADEC sent a letter to Chevron, Delta Western and the Corps commenting on the draft Phase I Site Characterization Report, prepared by Foster Wheeler, August 11, 2000. The draft report documents high levels of petroleum contamination in the thermal treatment area, in the APL yard where a 3" diameter fuel line was found to be leaking in ~1993, in a ravine on top of tank hill between UST 14 and 15, and in various locations along the fuel lines. Comments on the draft report need to be addressed, the report finalized and a Phase II site characterization effort is being planned.

John Halverson

10/10/2000

Update or Other Action

Staff reviewed and commented on a draft Phase II Site Characterization Workplan. Several comments were provided that needed to be addressed before receiving ADEC approval. In general, the plan called for installing several more monitoring wells and drilling and sampling several soil borings to better delineate the extent of contamination. The Phase I report was not finalized, but agreement was reached that the results from Phase I and II would be combined into one report.

John Halverson

4/11/2001

Update or Other Action

Staff reviewed and commented on the draft Phase I/II Site Characterization Report dated 2/28/01. Many issues were identified that need to be clarified and resolved in the report before it can be approved as meeting the site characterization requirements.

John Halverson

5/16/2001

Update or Other Action

ADEC received the Fourth Quarter 2000 and First Quarter 2001 Groundwater and Surface Water Monitoring Results Rocky Point Management Area 1 report, prepared by Delta Environmental Consultants. It documents groundwater monitoring done in January and April 2001. Petroleum contaminated groundwater documented at concentrations ranging up to 1,200 mg/l DRO and 27.4 mg/l GRO.

John Halverson

8/6/2001

Update or Other Action

ADEC received the Rocky Point Groundwater Monitoring Data Report (June 2001 Sampling Event), dated August 2001. The report documents water level measurements and analytical results from sampling at 17 monitoring wells throughout the site. Varying levels of petroleum contamination are documented in groundwater ranging up to 3.6 mg/l DRO and 2.2 mg/l GRO (significantly lower than the January and April sampling, however, these latest samples were collected using a peristaltic pump rather than a bailer).

John Halverson

12/7/2001

Update or Other Action

Staff reviewed and commented on the revised draft Phase I/II Site Characterization Report dated July 27, 2001. Numerous issues still need to be resolved in the report.

John Halverson

3/26/2002

Update or Other Action

DEC received the Quarterly Groundwater Monitoring Program - February 2002 Sampling Event - report on the Pre WWII Tank Farm and Rocky Point, dated March 2002, by Jacobs Eng.

John Halverson

4/22/2002

Update or Other Action

DEC received a draft data report - Rocky Point Groundwater Monitoring Program, September 2001 Sampling Event, dated December 2001, by Jacobs Engineering.

John Halverson

5/16/2002

Site Characterization Report Approved

DEC received the Final Phase I/II Site Characterization Report for Rocky Point Management Area #1, dated May 15, 2002, by Foster Wheeler. The report documents the site history and prior site characterization work. The report recommends interim removal actions at the lower APL area and between the thermal treatment area and East Point Road; a focussed feasibility study on the Pete's Creek area, thermal treatment area, and around Building 575; further characterization was recommended for Pete's Creek, Strawberry Hill (Tank 17-18 Area, Building 627 and Tar Pond A); on-going monitoring was recommended for the lower tank farm. It recommends preparing a closure report for the Upper Tank Farm Area.

John Halverson

6/21/2002

Update or Other Action

DEC received the Groundwater Monitoring Program 2001 Annual Report for the Pre-WWII Tank Farm and Rocky Point, dated June 2002, by Jacobs Engineering.

John Halverson

7/3/2002

Update or Other Action

Staff reviewed and commented on a draft Phase III Site Characterization Workplan. Several clarifications were requested.

John Halverson

7/9/2002

Update or Other Action

DEC received the Pre-WWII Tank Farm / Rocky Point Quarterly Groundwater Monitoring Report, May 2002 Sampling Event, by Jacobs Engineering.

John Halverson

1/23/2003

Site Added to Database

Rocky Point expanded into nine unique sites from one.

John Halverson

5/15/2003

Update or Other Action

DEC received the draft Phase III Site Characterization Report for Rocky Point Management Area #1, dated May 5, 2003, by Tetra Tech FW. The report recommends continued groundwater monitoring in the lower tank farm area, but no active cleanup.

John Halverson

12/31/2003

Update or Other Action

DEC received the Groundwater Monitoring Program 2002 Annual Report for the Pre-WWII Tank Farm and Rocky Point, dated December 2003, by Jacobs Engineering.

Meghan Dooley

9/23/2004

Update or Other Action

DEC received the Groundwater Monitoring Program 2003 Annual Report for the Pre-WWII Tank Farm and Rocky Point, dated September 2004, by Jacobs Engineering.

Meghan Dooley

3/16/2005

Update or Other Action

DEC approved the draft Semi-annual Groundwater Monitoring Report - 1st Half 2004 for the Rocky Point Management Area #1.

John Halverson

6/10/2005

Update or Other Action

File number issued 2542.38.018.

Aggie Blandford

5/17/2006

Cleanup Level(s) Approved

DEC approved alternative cleanup levels for the Rocky Point Management Area #1. A prior determination was made that groundwater beneath the site is not a current or potential future drinkingwater source (18 AAC 75.350) and approved use of ten times the groundwater cleanup levels as long as groundwater discharging into nearby surface waters does not cause a violation of Alaska water quality standards. Alternative soil cleanup levels were calcutated using method 3 in 18 AAC 75.340. The resulting migration to groundwater values for DRO and RRO exceeded the method two ingestion cleanup levels and the GRO value exceeded the maximum allowable concentration (1400 mg/kg) in Table B-2. Therefore, the following alternative soil cleanup levels were approved: 8,250 mg/kg DRO, 8,300 mg/kg RRO, and 1,400 mg/kg GRO. The approval letter noted the requirement for DEC approval prior to moving any contaminated soil (exceeding method 2 migration to groundwater levels) off-site.

John Halverson

5/17/2006

Update or Other Action

DEC conditionally approved an addendum to the 2004 Groundwater Monitoring Workplan for the Rocky Point Management Area. DEC requested samples of NAPL be collected from any MWs that contain NAPL which has not been previously sampled and analyzed to determine the type and extent of weathering of the product.

John Halverson

5/23/2006

Update or Other Action

DEC conducted a site inspection of the Rocky Point Management Area with ChevronTexaco, Delta Western, Army Corps of Engineers, SECOR, and Ounalshka Corp. Delta Western's new pipelines design work is done, supports are being surveyed in this week, plan to have a crew installing/welding pipe in ~2 weeks. Inspected pipeline route and surrounding area. Contaminated soil stockpile from the Tank 12 line leak is adjacent to road on the hillside - needs additional netting to secure the cover. Inspected valve houses - the two closest to the fuel dock have a strong fuel odor and sheen/product on water in them. Discussed plan to isolate, clean and conduct maintenance on the valves in each followed by weekly inspections. Inspected the interception trench for product recovery along East Pt. Road; water level flucuating to extent booms don't stay in contact with the watertable - needs resolution. Sump for biocell #2 needs to be drained - biocell may not be draining properly because sump is full of water.

John Halverson

11/17/2006

Update or Other Action

SECOR developed a "Focused Feasiblity Study for Pipeline Closure Project, Rocky Point Management Area" on behalf of Chevron. The study recommends uncovering, cleaning and purging all inactive pipelines; removing inactive lines where feasible; cleaning and removing appurtenent facilities (valve houses, pumphouses, ect.); removing a limited amount of soil (up to 3' from the lines) to allow project completion without having to chase contaminated soil - will come back to fully characterize and cleanup as needed; clean and abandone in place lines where removal is unsafe or not practicable; and collect soil samples at 50' intervals along pipelines.

John Halverson

7/17/2007

Cleanup Plan Approved

DEC approved a Pipeline Closure Workplan for Rocky Point Management Area. The plan calls for draining, cleaning and removing (unless safety concerns warrant in place closure of sections) all inactive fuel pipelines at Rocky Point, characterizing soil along the pipeline coordidors, removing contaminated soil located within 3' of the lines and stockpiling it for treatment next year. Cleanup of contaminated soil extending beyond 3' from the pipelines will be incorporated into the overall site cleanup plan scheduled for 2008.

John Halverson

3/5/2008

Update or Other Action

DEC received the "Semi-Annual Groundwater Monitoring and Operations and Maintenance Report - First Half 2007" from SECOR on behalf of Chevron. LNAPL continues to be observed in MWRP-22, MWRP-24, MWRP-28, MW-2 and MW-13; samples were not collected from these wells for laboratory analysis. Water samples from MWRP-33 and PC-2 continue to exceed the cleanup levels. Water samples were collected from the tunnels into tanks 12, 13, 17 and 18, valve house A, and two brick structures thought to be heater pits; water from these structures contains elevated concentrations of DRO, RRO, PAHs, and/or BTEX. The bioventing system on tank hill was not operating - it had been shut off for the winter and the power line was cut by a plow; based on a review of past performance data SECOR recommended discontinuing operation of the system and development of an alternative cleanup option. Soil in biocells 1 and 2 and the stockpile from Tank 2 was characterized, met cleanup levels, and the cells were decommissioned; the treated soil was stockpiled for use as on-site backfill during the pipeline closure project. The top 4 feet of soil in the Tank 12 Stockpile was sampled and met the site cleanup levels; the top 4 feet can be removed and used as on-site backfill and then the remainder of the stockpile needs to be characterized. Sorbent booms in the interception trench were changed out during the first quarter and were still in good condition during the second quarter.

John Halverson

5/30/2008

Exposure Tracking Model Ranking

Initial ranking with ETM completed.

Evonne Reese

6/30/2008

Update or Other Action

DEC received the "2007 Pipeline Closure Documentation Report..." prepared by Stantec on behalf of Chevron. The report documents work done to properly close abandoned fuel pipelines at the Rocky Point Tank Farm area. Approximately 18,200 lineal feet of pipeline was identified for closure in the workplan; an additional 10,021 feet of pipeline was identified during the fieldwork. A total of 18,021 feet of pipeline was removed. Site characterization and limited soil removal were conducted. Some of the valve houses were also cleaned and demolished. Two underground brick structures thought to be part of heater-pits were found to be transformer vaults; the transfomers were removed, sampled, determined to be non-PCB transformers and disposed of off-site; trace levels of PCB were found in water from one vault. Due to the increase in the amount of piping determined to be present, additional closure will be conducted in 2008.

John Halverson

1/23/2009

Update or Other Action

Stantec submitted a report titled "Documentation Report for Waste Management and Assessment During Electrical Conduit Excavation and Assessment for Tank 2" on behalf of Chevron. The report documents work conducted in 2006. SECOR was hired to conduct sampling analysis and waste management during installation of an electrical line from East Point Road behind the lower tank farm to a new fuel pumphouse. Several fuel pipelines were encountered and are depicted in a figure in the report. LNAPL was observed in in a several locactions including in soil ~500' from the start of the trench and in groundwater seepage into the trench at ~570', 630', 675' and 700' from the start of the trench. The product was reported as appearing Bunker C-like material. Petroleum contaminated soil from the excavation was segregated and stockpiled in the Thermal Treatment area (Tank 2 Stockpile). Soil samples collected from the electrical line trench and test pits around Tank 2 did not contain petroleum at levels above the site specific cleanup levels (8,250 mg/kg DRO, 8,300 mg/kg RRO, and 1,400 mg/kg GRO).

John Halverson

3/30/2009

Update or Other Action

DEC received a copy of the "Semi-Annual Area Wide Groundwater Monitoring Report and O&M Report - First Half 2008" from Stantec, on behalf of Chevron. The report documents groundwater level and flow directions, generally stable or decreasing petroleum concentrations in groundwater, the presence of measurable LNAPL in 9 out of 61 monitoring wells that were gauged, residual petroleum contaminated water access tunnels to abandoned underground storage tanks 16, 17 and 18, and work done to maintain and evaluate the interception trench/product recovery system and the oil water separator system.

John Halverson

6/4/2009

Interim Removal Action Approved

DEC received the 2008 Pipeline Closure Report for the Rocky Point Management Area, prepared by Stantec for Chevron. The report documents removal or in-place closure of 23 pipelines (332 linear feet (LF) of above ground lines and 9,098 LF of below ground lines). Approximately 7,000 LF of pipe was removed from the ground and 2,400 LF closed in place. Approximately, 16,185 gallons of residual fuel were removed from the piping. Over 101,000 gallons of contaminated water from decontamination and dewatering activities were treated on-site and discharged. Over 400 soil samples were collected and analyzed. Eight appertenant structures (valve houses, pump houses, etc.) were cleaned and removed. Approximately 6,000 LF of inactive pipeline have been identified for future closure.

John Halverson

7/31/2009

Update or Other Action

DEC received the "Semi-Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - Second Half 2008", from Stantec on behalf of Chevron. 59 monitoring wells were gauged for water level data and 33 MWs were sampled. Samples from three MWs exceeded the cleanup levels for groundwater discharging into surface water; the 30 other MWs did not exceed cleanup levels of 10 times the Table C levels (samples from 5 MWs exceeded the Table C levels). Eight MWs (four of which are in the Pre WWII Tank Farm Area {MW-2, MW-11, MW-13 and MW-16} and four within the Thermal Treatment Area {MWRP-22, MWRP-24, MWRP-28 and IWPZ-07}) contained measurable LNAPL and were not sampled. LNAPL thickness ranged from 0.04' to 2.78'. 5.85 liters of product were removed from the MWs in the Thermal Treatment area. Product mobility and recoverability are being evaluated. Five tank tunnels and ten valve houses have been inspected and water samples collected from them over time. Nine of the valve houses were removed during 2007-08; valve house H remains - no water was present in valve house H during the quarterly inspections. The tank tunnels were not sampled during the 2nd half of 2008. The bioventing system on Tank Hill remained off pending development of an alternative cleanup plan. Sorbent booms in the interception trench and on-site oil water seperator were inspected and replaced as necessary. Soil from the remainder of the Tank 12 stockpile was sampled, met cleanup levels and was moved to a stockpile for beneficial use as on-site fill material.

John Halverson

8/27/2009

Update or Other Action

Note to file 8-27-09. As per John Halverson I am cross-referencing five documents: 1. Phase 2 Characterization Workplan for East Point/Ballyhoo Road Rehabilitation Unalaska March 2000, Golder Associates; 2. Draft Phase 2 Site Characterization Unalaska: East Point/Ballyhoo Rd. Rehabilitation April 2001, Golder Associates; 3. Preliminary Engineering Study for the Relocation of Pipelines at The Dutch Harbor Facility, Unalaska; November 2001, Hattenburg & Dilley Engineering Consultants; 4. Phase 2 Site Characterization Unalaska: East Point/Ballyhoo Rd. Rehabilitation June 2003, Golder Associates; and 5. Corrective Action Plan for Unalaska: East Point/Ballyhoo Rd. Rehabilitation Unalaska December 2003, Golder Associates. These five documents are associated with the file number 2542.38.030 which is listed in the FileRoom database but not listed in the CS database. These five documents are filed in the CS files, in Anchorage, under file number 2542.38.030. This note will be placed in the three Hazard ID #’s: 509, 510, and 512 under CS file number 2542.38.018.

Pam Clemens

6/23/2010

Update or Other Action

The Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2009 was recieved to ADEC. The report addressed groundwater contamination in the Rocky Point Management Area as well as maintenance of structures associated with the remedy. During the first half of 2009, 62 wells were gauged for LNAPL thickness and groundwater depth. Samples were collected from 32 wells and 5 wells exceeded cleanup levels for surface water. Eight wells had residual or measurable thickness of LNAPL, however some of these contained Bunker-C like material and were not removed. In second half 2009, 4 wells were installed during the Site Assessment and incorporated into the groundwater monitoring program. Monitoring was discontinued at Well PC-01 as a new well was installed in the area. Seven wells that were gauged had residual or measurable free product, one of these containing Bunker-C. The installation of MWRP-37 in the APL operations area called for recovery of 83.28 L of product. 57 wells were gauged and 32 were sampled in the second half of 2009. Five wells exceeded surface water cleanup levels in tank Hill area, Petes Creek, APL operations, and Thermal Treatment Area. O&M activities were performed on the OWS, the interceptor trench, tank tunnels, and the sedimentation basin. Boom was replaced as needed.

Meghan Dooley

8/20/2010

Update or Other Action

ADEC received the 2009 Site Assessment Documentation Report. A total of 106 locations were sampled with UVOST/LIF in the Rocky Point Managment Area to characterize extent of soil contamination. Four monitoring wells were installed and incorporated into the groundwater monitoring program. Soil samples indicated concentrations of light end constituents such as GRO, benzene, ehtylbenzene, and totals xylenes above cleanup levels at the Lower Tank Farm and APL operations area. Two of the four wells were installed in this area, and MWRP-37 had LNAPL at a thickness greater than 6 feet.

Meghan Dooley

12/19/2013

Update or Other Action

Electronic submittal recieved: Work Plan for Installation of Recovery and Monitoring Wells, Lower Tank Farm Area.

Meredith Savage

1/24/2014

Document, Report, or Work plan Review - other

ADEC sends out comments on Work Plan for Installation of Recovery and Monitoring Wells, Lower Tank Farm. The scope of work for this plan is to install a light nonaqueous-phase liquid (LNAPL) recovery well and two groundwater monitoring wells in the vicinity of monitoring well MWRP-37. MWRP-37 is located in the northwest section of the area known as the Lower Tank Farm, within the Rocky Point Mangement Area, on the SE side of Amaknak Island.

Meredith Savage

5/21/2014

Document, Report, or Work plan Review - other

Response to comments received electronically on 4/25/2014. ADEC responds on 5/21/2014 with additional comments and requests final version of Work Plan.

Meredith Savage

8/7/2014

Document, Report, or Work plan Review - other

Received on July 24, 2014: Final Work Plan for Installation of Recovery and Monitoring Wells, Lower Tank Farm Area, Rocky Point Management Area, Dutch Harbor, Unalaska, Alaska. Final approval of the work plan sent out on August 7, 2014.

Meredith Savage

3/16/2015

Document, Report, or Work plan Review - other

Final copy of the 2013 Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report received January 6, 2015. The report provides the results of semi-annual groundwater monitoring events conducted June, September, and December 2013. 51 out of 59 groundwater monitoring wells were gauged to measure depth to groundwater, total well depth, and note presence of any light non-aqueous phase liquid (LNAPL). LNAPL was recovered from 7 wells during the June monitoring event, from 4 wells during the September event, and from 2 wells during the December monitoring event. Groundwater samples were collected from 36 of 41 wells scheduled for monitoring during the June event and from 19 of 26 wells scheduled for monitoring during the December event; analysis included DRO, GRO, BTEX, and PAHs. Out of the 36 samples from June cleanup levels were exceeded for DRO in wells PC-02 (alternative cleanup levels), MWRP-18, MWRP-25, MWRP-28, MWRP-39, TW-03, PC-02, SV-01, MWCV-03, and MWCV-04; for benzene MWRP-05 and MWRP-38; and for lead in MW-05. Of the 19 December samples cleanup levels were exceeded for DRO in wells MWRP-28 (alternative cleanup levels), MWRP-11, MWRP-25, MWRP-28,MWRP-29, MWRP-39, TW-02, TW-03, PC-02, and SV-01; and for lead and benzene in well MWRP-05. Results of the monitored natural attenuation (MNA) evaluation suggest that subsurface conditions are generally favorable for intrinsic biodegradation of petroleum hydrocarbons by anaerobic degradation.

Meredith Savage

6/27/2016

Document, Report, or Work plan Review - other

Approved the “Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2014” for the RPMA. In 2016, Stantec will attempt to locate and repair damaged monitoring wells within the RPMA monitoring well network. Sentinel monitoring well MWRP-03 in the Lower Tank Farm had a DRO detection below cleanup levels; DRO concentrations in well MWRP-03 have been decreasing since 2012.

Holly Weiss-Racine

11/4/2016

Document, Report, or Work plan Review - other

Approved the “Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2015” for the RPMA. In 2016, Stantec will attempt to locate and repair damaged monitoring wells within the RPMA monitoring well network.

Holly Weiss-Racine

5/31/2017

Update or Other Action

ADEC received the “Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2016” for the RPMA by Stantec on behalf of Chevron and Delta Western.

Linda (Qi) Liu

11/3/2017

Document, Report, or Work plan Review - other

ADEC received, commented and approved "Sampling and Analysis Plan for Groundwater Monitoring and Operations and Maintenance" for RPMA area. The plan was submitted by Stantec on behalf of Chevron and Delta Western.

Linda (Qi) Liu

7/2/2018

Update or Other Action

ADEC received the “Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2017” for the RPMA by Stantec on behalf of Chevron and Delta Western.

Rachael Petraeus

4/19/2019

Update or Other Action

ADEC received the “Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report - 2018” for the RPMA by Stantec on behalf of Chevron and Delta Western. The dominant groundwater flow directions from Tank Hill are to the southeast toward the Lower Tank Farm Area and to the northwest toward the Pre-World War II Tank Farm. Groundwater flow direction in the TTA is to the west until it turns and runs generally north, parallel to Ilulaq Lake. Results of historical MNA evaluations suggest that subsurface conditions are generally favorable for intrinsic biodegradation of petroleum hydrocarbons by anaerobic degradation, which is likely contributing to some reduction in petroleum hydrocarbon concentrations.

Rachael Petraeus

9/27/2019

Update or Other Action

On September 27, 2019 ADEC received the "Rocky Point Management Area Semi-Annual Groundwater Monirtoring & O&M" transmittal letter dated September 27, 2019. The letter documents a request that, effective this year, one annual groundwater sampling event in May is appropriate rather than two semi-annual groundwater sampling events. ADEC approves the request. A review of the historical site data indicates that groundwater monitoring events in the Rocky Point Management Area have a long-term trend of concentrations showing little variability due to seasonal impacts. However, if new site groundwater monitoring results indicate increasing concentrations or changes in concentration variability at the groundwater monitoring wells sampled as part of the annual monitoring program, ADEC will request modifications in sampling frequencies in the future.

Rachael Petraeus

1/28/2020

Update or Other Action

ADEC received the transmittal letter "Rocky Point Management Area Weir Inspection Activities" dated December 20, 2019. The letter documents a request that , effective January 1, 2020, monthly weir inspections be completed for Tanks 12, 13, 16, 17 and 18 the Dutch Harbor Rocky Point Tank Farm rather than weekly weir inspections. ADEC approves the request for a 2 year period, with a requirement to assess water sample results taken during that time to determine if there is data variability in the water samples due to concentration fluctuations or sampling method. ADEC requests to include these water samples results in the annual groundwater monitoring reports. In addition, if new site inspection results indicate an observance of water with sheen being discharged from any of the tank tunnels and/or sample results indicate changes in concentration variability at the groundwater monitoring wells sampled, ADEC will request modifications in sampling frequencies in the future.

Rachael Petraeus

8/11/2021

Document, Report, or Work plan Review - other

Bulk action for all sites within the Rocky Point Management Area Operational Area Boundaries. ADEC received the Annual Area-Wide Groundwater Monitoring and Operation and Maintenance Report – 2020 for the Rocky Point Management Area in Dutch Harbor, Unalaska on May 26, 2021. Activities included inspection and maintenance of the Thermal Treatment Area (TTA) oil-water separator (OWS) and sedimentation basin; the East Point Loop Road (EPLR) OWS and sedimentation basin; and the TTA groundwater interceptor trench, collection vaults, and surface water drainage culverts. Light nonaqueous-phase liquid (LNAPL) recovery O&M activities at monitoring wells MWRP-24 and MWRP-37 are ongoing, and in 2020 were conducted on a monthly basis at monitoring well MWRP-24 and on a weekly basis at monitoring well MWRP-37. The frequency of the groundwater monitoring and O&M activities at the Rocky Point Management Area (RPMA) was reduced from semiannual to annual in 2019. ADEC recommends MWRP-15 is added to the list of wells to be sampled for Diesel Range Organics (DRO), Gasoline Range Organics (GRO), and Polycyclic Aromatic Hydrocarbons (PAHs). Additionally, ADEC requests some recommendations are provided regarding the access to monitoring wells, particularly those with free product historically observed. Several wells were unable to be sampled due to being located under shipping containers. Responses sent on July 16, 2021.

Cascade Galasso-Irish

7/7/2022

Document, Report, or Work plan Review - other

Bulk action entry for the RPMA - ADEC received the Annual Area-Wide Groundwater Monitoring and Operations and Maintenance Report – 2021 Rocky Point Management Area Dated April 2022. The 2021 annual groundwater monitoring and operations and maintenance (O&M) activities included inspection and maintenance of the Thermal Treatment Area (TTA) oil-water separator (OWS) and sedimentation basin; the East Point Loop Road (EPLR) OWS and sedimentation basin; and the TTA groundwater interceptor trench, collection vaults, and surface water drainage culverts. Annual groundwater monitoring is conducted at the Rocky Point Management Area (RPMA), and O&M operations also include the ongoing light non-aqueous phase liquid (LNAPL) recovery at wells MWRP-24 and MWRP-37, which are conducted monthly. Due to project organization changes since the last work plan was approved in 2017, ADEC requests an updated work plan will be provided to ADEC for review and approval prior to the 2023 field efforts. In future reporting, ADEC requests the hazardous wastes and contaminated media derived from the RPMA groundwater monitoring are catalogued and a Transport, Treatment and Disposal form is provided to ADEC for review and approval in accordance with 18 AAC 75.325(i) when the wastes are transferred to a final destination. Per comment resolution, ADEC no longer supports discharge of purge water to the ground surface without granular activated carbon (GAC) treatment or being containerized and disposed of off-site. ADEC may approve foregoing soil sampling at this time if groundwater is handled appropriately in subsequent annual sampling. However, prior to site closure, soil sampling will need to occur to verify residual contamination is below current cleanup levels. ADEC concurs with the recommendations for the 2022 season in the cover letter submitted with the 2021 report. ADEC approved the final report on this date.

Cascade Galasso-Irish

4/10/2023

Document, Report, or Work plan Review - other

Bulk action entry for the Lower Tank Site and MWRP-37. DEC reviewed and approved the Product Recovery Report 2022 RPMA on this date. DEC agrees with the continued product recovery recommended at MWRP-24 and MWRP-37; and wells IWPZ-07, MWRP-22, and TW-02 to be removed from the product recovery operations and added to the annual groundwater sampling program if no product is observed in the wells in 2023. This tech memo is a supplemental document to the 2022 annual reporting and will be added as an appendix for final approval.

Cascade Galasso-Irish

4/20/2023

Document, Report, or Work plan Review - other

Bulk action entry for RPMA sites - on this date, DEC received and approved the 2022 Final Annual Area-Wide Groundwater Monitoring and Operation Maintenance Report for the Rocky Point Management Area, Dutch Harbor, Unalaska, Alaska. This document also includes the 2022 Well Status Report (Appendix E), the 2022 Cut and Cover Tank Tunnel Surface Water Trend Analysis (Appendix F), and the 2022 Product Recovery Tech Memo (Appendix G). The document has been filed under the sitewide RPMA file, Rocky Point Tank Hill, Hazard ID 509.

Cascade Galasso-Irish

6/2/2023

Document, Report, or Work plan Review - other

On this date, DEC reviewed and approved the Final Sampling and Analysis Plan, Area-Wide Groundwater Monitoring and Operation and Maintenance Sampling and Analysis Plan, Rocky Point Management Area, Unalaska, Alaska.

Cascade Galasso-Irish

1/30/2024

Document, Report, or Work plan Review - other

Bulk action entry for annual RPMA groundwater monitoring sites - DEC received the Annual Area-Wide Groundwater Monitoring and Operation and Maintenance Report – 2023 for the Rocky Point Management Area in Dutch Harbor, Unalaska. DEC agreed with all recommendations, including another attempt to sample MWRP-08 and -09 to monitor if concentrations in Tank Tunnel 17 are migrating to the bay. DEC had no other comments and requested the final document for review once the product recovery memo and weir inspection reports are completed and appended to the document.

Cascade Galasso-Irish

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Hazard ID	Site Name	File Number
2148	American President Line Ship Dock	2542.38.001

Hazard ID

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File Number

2148

American President Line Ship Dock

2542.38.001

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Alaska Department of Environmental Conservation

Site Report: Dutch Hbr-Rocky Point Lower Tank

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State of Alaska Department of Environmental Conservation