Site Report: Texaco #50

Site Name:	Texaco #50
Address:	601 Muldoon Rd.; , Anchorage, AK 99504
File Number:	2100.26.095
Hazard ID:	24008
Status:	Cleanup Complete
Staff:	No Longer Assigned, 9074655229 dec.icunit@alaska.gov
Latitude:	61.216833
Longitude:	-149.733268
Horizontal Datum:	NAD83

We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Site Chronology
IC / Closure Details
Documents
Associated Sites

Problems/Comments

Soil and groundwater contamination was discovered during service station facilities upgrades in 1989 seven underground storage tanks were removed and five replacement tanks were installed. Gasoline and diesel constituents, and trace amounts chlorinated solvents identified in used oil tank excavation. Up to 2,080 mg/kg GRO, 1,990 mg/kg DRO, 7.5 mg/kg benzene, and 0.144 mg/kg PCE in the samples collected. 738 tons of contaminated soil was excavated and thermally treated. Three monitoring wells were installed in 1989. Groundwater is about 20 feet below the surface and seasonally flows in the northwest to southwest direction. A water well survey in 1990 identified two drinking water wells in the area and they were sampled and found free of petroleum contamination. Two more monitoring wells installed in 1990. Groundwater sampling was conducted quarterly in 1990, and 1991, then annually in 1992, 1993, 1995, and 2000. Based on the groundwater concentrations declining to cleanup levels groundwater sampling was suspended in 2000. Soil confirmation samples are to be collected when the active underground storage tank system is removed. On January 2008 six soil borings were sampled as part of a Phase II assessment. Up to 0.030 mg/kg benzene and non-detect PAHs, PCBs, GRO, DRO, and RRO in the soil samples collected and up to 2.06 mg/l DRO, 0.121 mg/l GRO, 0.668 mg/l RRO, 874 ug/l lead, 24.2 ug/l cadmium, 2,940 ug/l chromium, 1.04 ug/l benzene, and non-detect PAHs (except for 0.124 ug/l naphthalene and 0.121 ug/l phenanthrene), and non-detect PCBs in the two groundwater samples collected. On July 2008 five underground storage tanks, their associated piping and two hydraulic hoists were removed. Contamination over migration to groundwater cleanup levels was found at three of the tanks. One of the three tank areas (the used oil tank) was cleaned up after excavating additional contaminated soil, but some benzene soil contamination was left at gasoline tank #1 (0.0325 mg/kg benzene) and gasoline tank #4 (0.0296 mg/kg benzene). Seven site monitoring wells were decommissioned in 2008 during site redevelopment. In May 2010 on additional monitoring well was installed to help define the extent of the groundwater contamination at this site. In October 2011 additional release investigation work was conducted to check current contaminant concentrations in soil at the site. The soil samples collected were below migration to groundwater cleanup levels, including non-detect for PAHs and PCE. In October 2012 three monitoring wells were decommissioned and a replacement monitoring well MW-3R was installed and sampled to replace damaged monitoring well MW-3. The initial groundwater sampling of the replacement monitoring well MW-3R had 1.62 mg/l DRO, but subsequent groundwater samples were non-detect and below groundwater cleanup levels. That monitoring well was decommissioned in June 2016. The contamination in the soil and groundwater above cleanup levels discovered during the initial tank excavation in 1989 or during the tank excavation work conducted in 2008, were not detected above cleanup levels after additional cleanup activities and monitoring were conducted at the site. Site closure letter issued on August 25, 2016.

Action Information

Action Date	Action	Description	DEC Staff
7/17/1989	Underground Storage Tank Site Characterization or Assessment	Summary of UST removal, soils excavation, and boring/monitoring well placement for further soil/groundwater assessment.	Former Staff
7/17/1989	Document, Report, or Work plan Review - other	Statewide Petroleum removed USTs and installed an upgraded system. Soil contamination encountered. 7 USTs removed. Up to 2,080 mg/kg GRO, 1,990 mg/kg DRO, 7.5 mg/kg benzene, and 0.144 mg/kg PCE in the samples collected from the excavations.	Former Staff
7/20/1989	Leaking Underground Storage Tank Corrective Action Underway	Plan to dispose of contaminated soils at the Regional Landfill or Anchorage Sand & Gravel, depending on soil sampling results. Approved by ADEC on 7/21/89.	Former Staff
7/20/1989	Offsite Soil or Groundwater Disposal Approved	AS&G processed 735 tons of soils from the site on 9/23/89. Documented in a letter to ADEC on 11/3/89.	Former Staff
7/21/1989	Release Investigation	Work plan for UST removal and site characterization submitted by ENSR.	Former Staff
9/7/1989	Leaking Underground Storage Tank Release Confirmed - Petroleum	LUST Site created in CSP for source area ID 77721 Petroleum hydrocarbon contamination found during UST removals.	Former Staff
9/7/1989	Site Added to Database		Former Staff
9/8/1989	Leaking Underground Storage Tank Cleanup Initiated - Petroleum	LCAU Date changed DB conversion.	Former Staff
11/21/1989	Document, Report, or Work plan Review - other	A water well survey in 1989 identified eleven potential drinking water wells within 1,000 feet of this site.	Former Staff
1/27/1990	Document, Report, or Work plan Review - other	In 1990 only two of the eleven potential drinking water wells were confirmed as in-use water wells. Those two drinking water wells were sampled and found free of petroleum contamination.	Former Staff
5/3/1990	Update or Other Action	ADEC requests private wells be sampled using EPA Method 503.1 and also requests a work plan for placing additional monitoring wells to assess the groundwater moving off site. Draft plan and sampling comments received by ADEC on 5/17/90. ADEC comments on 6/5/90, requests Texaco to determine if wells downgradient of site were properly closed. ENSR submits remedial action plan for the site on 6/5/90. A vapor extraction combined with a groundwater recovery and air stripping treatment system was recommended by ENSR.	Former Staff
8/1/1990	Document, Report, or Work plan Review - other	Additional soil borings and monitoring well placement for further site assessment in conjunction with site remediation. Quarterly monitoring results. Groundwater sampling on 8/21/90 showed a distinct decrease from sampling on 10/4/89. On 8/21/90 benzene was not detected in wells MW-2 through MW-6. Sample MMW-1 had 9.0 ppb benzene and 1,780 ppb xylene. Groundwater flows towards the west at a depth of about 20 feet below the surface.	Former Staff
7/22/1991	Offsite Soil or Groundwater Disposal Approved	Anchorage Sand & Gravel sent in receipts of soils processed at the Klatt road facility. Soils were blended with AC-5 for use as a black base material.	Former Staff
11/20/1997	Update or Other Action	ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TEXACO REFINING & MARKETING INC.	Former Staff
3/19/2000	Document, Report, or Work plan Review - other	December 28, 2000 groundwater monitoring event. 5 monitoring wells sampled. Up to 0.14 mg/l DRO , and non-detect benzene and GRO in the groundwater. Depth to groundwater is 18.45 to 19.31 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have decreased.	Robert Weimer
5/14/2002	Meeting or Teleconference Held	As discussed in May 14, 2002 meeting soil contamination remains near monitoring well MMW-5 (stained soils at groundwater at 20 feet below ground surface, up to 4,820 mg/kg TPH), and soil boring MB-2 (up to 1,360 mg/kg TPH at 20 feet below ground surface).	Robert Weimer
8/31/2004	Meeting or Teleconference Held	Follow up meeting, as we discussed in May 14, 2002 meeting soil contamination remains near monitoring well MMW-5 (stained soils at groundwater at 20 feet below ground surface, up to 4,820 mg/kg TPH), and soil boring MB-2 (up to 1,360 mg/kg TPH at 20 feet below ground surface).	Robert Weimer
10/24/2005	Update or Other Action	Need soil confirmation samples for closure.	Robert Weimer
3/9/2007	Exposure Tracking Model Ranking	Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site.	Robert Weimer
7/8/2008	Document, Report, or Work plan Review - other	On January 30-31, 2008 six soil borings were sampled and groundwater samples were collected from two of the borings. No monitoring wells were installed. Up to 0.030 mg/kg benzene and non-detect PAHs, PCBs, GRO, DRO, and RRO in the soil samples collected and up to 2.06 mg/l DRO, 0.121 mg/l GRO, 0.668 mg/l RRO, 874 ug/l lead, 24.2 ug/l cadmium, 2,940 ug/l chromium, 1.04 ug/l benzene, and non-detect PAHs (except for 0.124 ug/l naphthalene and 0.121 ug/l phenanthrene), and PCBs in the two groundwater samples collected. Location MB-2 was sampled and appears to meet cleanup levels. Location MMW-5 was not assessed. Need monitoring wells/soil borings to define the extent of the contamination identified at this site (MMW-5 and the January 2008 contamination).	Robert Weimer
7/9/2008	Update or Other Action	Discussed site status with RP's consultant. They will talk with Shell about submitting a release investigation work plan. They plan to remove and assess the existing tank system on July 21, 2008.	Robert Weimer
7/21/2008	Site Visit	Site visit to observe removal of used oil tank and some of the product piping. Discuss site work with RP's consultant.	Robert Weimer
7/22/2008	Site Visit	Site visit to observe removal of gasoline tanks and some of the product piping. Discuss site work with RP's consultant.	Robert Weimer
7/28/2008	Site Visit	Site visit to discuss stockpile and excavation sampling with RP's consultant. They need to collect at a minimum analytical samples at the elevated northwest and northeast piping locations. Also it appears that the visibly stained soil in the used oil stockpile was not sampled, that soil will need to be treated or disposed of in an approved manner.	Robert Weimer
7/28/2008	Update or Other Action	ADEC conditionally approves the placement of the diesel (30 cy) and gasoline (220 cy) stockpiles back in the excavation pending submittal and final QA/QC review of the lab data. The 5 cubic yards of used oil contaminated soil that contains some visibly stained soil is not approved for use as backfill.	Robert Weimer
8/13/2008	Offsite Soil or Groundwater Disposal Approved	Review and approve request for disposal of 7 drums of used oil contaminated soil at an out of state landfill.	Robert Weimer
5/18/2009	Meeting or Teleconference Held	Discussed site with RP's consultant. They plan to sample all existing monitoring wells for BTEX, GRO, DRO, RRO, and the metals (lead, cadmium, and chromium) in June 2009. Based on a review of the results additional groundwater monitoring and/or monitoring wells may be required. Confirmation soil sampling for the two locations in the 2008 tank excavation and monitoring MMW-5 location will be required prior to site closure.	Robert Weimer
8/24/2009	Document, Report, or Work plan Review - other	June 12, 2009 groundwater monitoring event. Only 2 of the 5 monitoring wells sampled, they could not open the other 3 well caps. Up to 0.2 mg/l RRO, and non-detect benzene, GRO, DRO, and MTBE in the groundwater samples collected. Depth to groundwater is 18.65 to 18.66 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have decreased. Metals sampling was not conducted as requested.	Robert Weimer
9/22/2009	Document, Report, or Work plan Review - other	On July 2008 five underground storage tanks (one diesel, one used oil, and three gasoline tanks) and two hoists were removed. Contamination over cleanup levels was found at the used oil tank, tank 1, and tank 4. The used oil tank contamination was removed, but contamination remains over cleanup levels at tank #1 (T1-3-12, a duplicate of T1-1-12) with 0.0325 mg/kg benzene (0.025 mg/kg cleanup level), and tank #4 (T4-1-12) with 0.0296 mg/kg benzene. All of the metals detected appear to be at naturally occurring concentrations. For the PAH soil samples up to 0.0783mg/kg benzo(k)perylene, 0.0702 mg/kg chrysene, 0.0824 mg/kg fluoranthene, 0.0615 mg/kg pyrene, the rest of the PAHs were non-detect.	Robert Weimer
9/22/2009	Update or Other Action	Need monitoring wells and soil borings to define the extent of the contamination identified at this site. MMW-5 (stained soils at groundwater at 20 feet below ground surface, up to 4,820 mg/kg TPH), tank 4 (sample T4-1-12 had 0.0296 mg/kg benzene at 12 feet), tank 1 (sample T1-3-12 had 0.0325 mg/kg benzene at 12 feet) and the January 2008 temporary monitoring wells groundwater contamination (Up to 0.121 mg/l GRO, 2.06 mg/l DRO (1.5 mg/l cleanup level), 0.668 mg/l RRO, 874 ug/l lead, (15 ug/l cleanup level), 24.2 ug/l Cadmium (5 ug/l cleanup level), 2,940 ug/l Chromium (100 ug/l cleanup level) and 1.04 ug/l benzene in the groundwater).	Robert Weimer
10/2/2009	Update or Other Action	DEC letter to the RP requesting by December 1, 2009 a work plan for the installation of two monitoring wells at TKSB-7 and TKSB-8, and three soil borings at T1-3-12 (tank #1 for benzene at 12 feet below ground surface), T4-1-12 (tank #4 for benzene at 12 feet below ground surface), and just downgradient of MMW-5 (for BTEX, GRO, DRO, PAH, and RRO at 20 feet below ground surface). The groundwater in each of these monitoring wells be sampled, until further notice for BTEX, GRO, DRO, lead, cadmium, and chromium along with the other groundwater monitoring events at this site.	Robert Weimer
1/27/2010	Document, Report, or Work plan Review - other	September 17, 2009 groundwater monitoring event. 4 of the 5 monitoring wells sampled. Up to 1.2 ug/l benzene, non-detect (<0.1 mg/l) GRO, non-detect (<0.8 mg/l) DRO, non-detect (<1.0 ug/l) MTBE, non-detect (<5 ug/l) lead, and 0.48 mg/l RRO in the groundwater. Depth to groundwater is 19.00 to 19.98 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 1 of the 4 monitoring wells sampled.	Robert Weimer
3/15/2010	Document, Report, or Work plan Review - other	December 10, 2009 groundwater monitoring event. 4 of the 5 monitoring wells sampled. Up to 2.2 mg/l RRO, non-detect (<0.5 ug/l) benzene, non-detect (<0.1 mg/l) GRO, non-detect (<0.8 mg/l) DRO, non-detect (<1.0 ug/l) MTBE, non-detect (<5 ug/l) lead, non-detect (<5 ug/l) Cadmuim, and non-detect (<10 ug/l) Chromium in the groundwater. Depth to groundwater is 19.45 to 20.04 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 2 of the 4 monitoring wells sampled.	Robert Weimer
3/23/2010	Document, Report, or Work plan Review - other	DEC letter conditionally approving the drilling of 3 soil borings and installation of 2 monitoring wells. Conditions are that for the proposed monitoring wells MW-6 and MW-7 that a soil sample be collected at the soil/water interface, with an additional soil sample collected if a higher field reading is found at a different depth than the soil/water interface.	Robert Weimer
5/12/2010	Update or Other Action	Talked with Shell Oil's consultant (Delta) they plan to conduct the confirmation soil sampling and the installation of the 2 additional monitoring wells sometime between May 17 - May 21, 2010.	Robert Weimer
5/12/2010	Document, Report, or Work plan Review - other	March 18, 2010 groundwater monitoring event. 4 of the 5 monitoring wells sampled. Up to 1.4 ug/l benzene (5 ug/l cleanup level), 1.0 mg/l RRO (1.1 mg/l cleanup level), 8 ug/l lead (15 ug/l cleanup level), and non-detect GRO, DRO, Cadmuim, and Chromium in the groundwater. Depth to groundwater is 19.87 to 20.42 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 3 of the 4 monitoring wells sampled, but all samples meet site cleanup levels.	Robert Weimer
5/13/2010	Update or Other Action	Email from Shell Oil's consultant (Delta) they plan to begin the confirmation soil sampling and the installation of the 2 additional monitoring wells on May 17 - May 18, 2010. Field work is anticipated to take about 5 days. The report of the results of the soil and groundwater sampling is to be submitted about 2 months after that.	Robert Weimer
9/23/2010	Update or Other Action	Talked with Shell's environmental consultant (Delta) about the status of the report documenting the confirmation soil sampling and the installation of additional monitoring wells in May 2010. He said the draft report is still under review by Shell.	Robert Weimer
10/27/2010	Document, Report, or Work plan Review - other	May 19-20, 2010 groundwater monitoring event. 6 monitoring wells sampled. Up to 2.9 mg/l RRO, non-detect (<0.5 ug/l) benzene, non-detect (<0.1 mg/l) GRO, non-detect (<0.8 mg/l) DRO, non-detect (<5 ug/l) lead, non-detect (<5 ug/l) Cadmium, and non-detect (<10 ug/l) Chromium in the groundwater. Depth to groundwater is 19.51 to 21.42 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 1 of the 6 monitoring wells sampled.	Robert Weimer
11/1/2010	Site Characterization Report Approved	On May 17-20, 2010 four soil borings were sampled and one was completed as a monitoring well (MW-7). Up to 1.3 mg/kg cadium (5 mg/kg cleanup level), 49 mg/kg chromium (at naturally occuring background levels), 27 mg/kg lead (400 mg/kg cleanup level), non-detect (<1.5 mg/kg) GRO (300 mg/kg cleanup level), 24 mg/kg DRO (250 mg/kg cleanup level), 140 mg/kg RRO (10,000 mg/kg cleanup level), and 0.070 mg/kg benzene (0.025 mg/kg cleanup level). The highest benzene contamination was found at 18 feet below ground surface just above the soil/water interface at 20 feet below ground surface at monitoring well MW-7. One soil boring (SB-3, located near MMW-5) and one monitoring well MW-6 were not completed, they are to be completed this fall.	Robert Weimer
4/1/2011	Meeting or Teleconference Held	Discuss site status with RP's new consultant (CRA). They plan to drill the soil boring (SB-3, located near MMW-5) and install the monitoring well MW-6 that were not completed in 2010. They will also submit a plan to collect additional characterization data in the area of monitoring well MW-7 that had benzene over cleanup levels.	Robert Weimer
7/20/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water.	Robert Weimer
8/25/2011	Meeting or Teleconference Held	Meeting with Shell and CRA to discuss proposed site investigation work plan. The plan proposes to install one additional monitoring well and sample 5 other soil borings to assess current soil contamination concentrations in those areas. The hope is that the sampling will demonstrate that the site has remediated to site cleanup levels. CRA is to provide a revised work plan.	Robert Weimer
9/6/2011	Document, Report, or Work plan Review - other	September 21, 2010 groundwater monitoring event. 6 monitoring wells sampled. Up to 0.32 mg/l RRO, and non-detect for benzene, GRO, DRO, lead, Cadmuim, and Chromium in the groundwater. Depth to groundwater is 15.38 to 17.45 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have decreased in 6 of the 6 monitoring wells sampled.	Robert Weimer
9/7/2011	Document, Report, or Work plan Review - other	November 13, 2010 groundwater monitoring event. 6 monitoring wells sampled. Up to 2.11 mg/l DRO (1.5 mg/l cleanup level), and non-detect benzene, GRO, lead, Cadmuim, and Chromium in the groundwater. RRO was not analyzed this monitoring event. Depth to groundwater is 19.15 to 20.00 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 1 of the 6 monitoring wells sampled.	Robert Weimer
10/6/2011	Site Characterization Workplan Approved	Approved September 19, 2011 Site Investigation Work Plan. The plan calls for collecting confirmation soil samples from borings at 6 locations and complete one of them as a monitoring well (MW-6). MW-6 will be added to the current groundwater monitoring program.	Robert Weimer
10/13/2011	Site Visit	Site visit to observe release investigation site work.	Robert Weimer
12/6/2011	Offsite Soil or Groundwater Disposal Approved	ADEC approves request for disposal of contaminated soil, decon water, and purge water at facilities in Oregon and Nevada.	Robert Weimer
12/19/2011	Site Characterization Report Approved	March 2-6, 2011 groundwater monitoring event. 6 monitoring wells sampled. Up to 1.1 mg/l RRO (1.1 mg/l cleanup level), and non-detect benzene, GRO, DRO, lead, Cadmuim, and Chromium in the groundwater. Depth to groundwater was 19.70 to 20.35 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 1 of the 6 monitoring wells sampled.	Robert Weimer
12/21/2011	Update or Other Action	ADEC approves reduction in groundwater monitoring at this site: Suspend all analytical sampling of the following monitoring wells: MW-1, MW-2, MW-3, MW-5, and MW-7, reduce analytical sampling of monitoring well MW-4 to DRO and RRO, and continue analytical sampling of monitoring well MW-6 for BTEX and GRO.	Robert Weimer
1/17/2012	Document, Report, or Work plan Review - other	May 25, 2011 groundwater monitoring event. 6 monitoring wells sampled. Up to 0.741 mg/l RRO (1.1 mg/l cleanup level), 0.77 ug/l chromium (100 ug/l cleanup level), and non-detect for benzene, GRO, DRO, lead, and cadmuim in the groundwater. Depth to groundwater was 19.91 to 20.55 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations were stable in the 6 monitoring wells sampled.	Robert Weimer
1/17/2012	Document, Report, or Work plan Review - other	August 2, 2011 groundwater monitoring event. 6 monitoring wells sampled. Up to 1.36 mg/l DRO (1.5 mg/l cleanup level), 3.07 mg/l RRO (1.1 mg/l cleanup level), and non-detect benzene, GRO, lead, cadmuim, and chromium in the groundwater. Depth to groundwater is 19.64 to 20.20 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations increased in 2 of the 6 monitoring wells sampled. Need continued quarterly groundwater monitoring to establish trends.	Robert Weimer
3/1/2012	Document, Report, or Work plan Review - other	November 9, 2011 groundwater monitoring event. 6 monitoring wells sampled including a new monitoring well MW-6 and a replacement monitoring well MW-4A that were installed in October/November 2011. Up to 2.16 ug/l lead, 5.74 ug/l chromium and non-detect benzene, GRO, DRO, RRO, and cadmuim in the groundwater. The monitoring well that had previously shown contamination over cleanup levels was not sampled this event because it was damaged. Depth to groundwater is 19 to 20 feet below ground surface. Historical groundwater flow direction is to the southwest. Groundwater contamination concentrations increased in 0 of the 6 monitoring wells sampled. Need continued quarterly groundwater monitoring to establish trends and repair monitoring well MW-3 so it can be sampled.	Robert Weimer
5/23/2012	Offsite Soil or Groundwater Disposal Approved	ADEC approved via email disposal of one drum of petroleum contaminated IDW soils generated at the facility for ultimate disposal at the Arlington landfill in Oregon.	Rich Sundet
7/11/2012	Document, Report, or Work plan Review - other	On October 2011 five soil borings were sampled and two monitoring wells (MW-4A and MW-6) were installed and sampled. Up to 0.0103 mg/kg benzene (0.025 mg/kg cleanup level), and non-detect PCE, PAHs, MTBE, GRO, DRO, and RRO in the soil samples collected.	Robert Weimer
7/11/2012	Update or Other Action	Based on the information provided DEC is not requesting any further sampling of monitoring wells MW-4A and MW-6. All of the site monitoring wells are approved to be decommissioned in accordance with the Department’s November 2011 Guidance. The last time monitoring well MW-3 was sampled (on 8/3/11) it showed contamination over cleanup levels for RRO and increasing DRO contamination near cleanup levels. The Department requests that once site construction is completed that a replacement long term monitoring well be installed (MW-3R), given site improvements as close as practicable to the MW-3 location for DRO and RRO groundwater sampling.	Robert Weimer
7/19/2012	Update or Other Action	ADEC requests documentation for the disposal of one drum of petroleum contaminated IDW soils generated at the facility at the Arlington landfill in Oregon.	Robert Weimer
10/30/2012	Offsite Soil or Groundwater Disposal Approved	ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water and 2 drums of contaminated soil.	Robert Weimer
2/12/2013	Document, Report, or Work plan Review - other	April 24, 2012 groundwater monitoring event. Only monitoring well MW-6 was sampled and it was non-detect for benzene and GRO. The monitoring well that had previously shown contamination over cleanup levels was not sampled this event because it was damaged. Depth to groundwater is 17 to 18 feet below ground surface. Groundwater flow direction was to the northwest. Need continued quarterly groundwater monitoring to establish trends and replace monitoring well MW-3 so it can be sampled.	Robert Weimer
2/13/2013	Offsite Soil or Groundwater Disposal Approved	ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water and 2 drums of contaminated soil.	Robert Weimer
2/14/2013	Document, Report, or Work plan Review - other	On October 21, 2012 replacement monitoring well MW-3R was installed. As per the approved work plan no soil samples were collected. Groundwater samples are to be collected in the future.	Robert Weimer
3/22/2013	Update or Other Action	ADEC is requesting that all sites where there has been no purge groundwater sampling conducted during the last year, that for the next sampling event that they do both no purge then purge sampling from each monitoring well, so we evaluate on a site specific basis whether no purge sampling has provided comparable data. The post purge well sampling for VOCs would need to be conducted via hydrasleeve, bladder pump, or in well pump. Non VOC sampling can be collected with a bailer or peristaltic pump (in addition to the VOC methods) if desired. The specific sampling methods will need to be documented in the report and included field notes. If there is not enough time to do this adjustment for the planned sample event of March 26-April 4, then we request it be done on the following event.	Robert Weimer
4/5/2013	Document, Report, or Work plan Review - other	June 13, 2012 groundwater monitoring event. Only monitoring well MW-6 was sampled and it was non-detect for benzene and GRO. The monitoring well that had previously shown contamination over cleanup levels was not sampled this event because it was damaged. Depth to groundwater is 17 to 18 feet below ground surface. Groundwater flow direction was to the southwest. Need continued quarterly groundwater monitoring to establish trends and replace monitoring well MW-3 so it can be sampled. The monitoring well was purged prior to sampling with a bladder pump.	Robert Weimer
4/16/2013	Document, Report, or Work plan Review - other	July 23, 2012 groundwater monitoring event. Up to 2.8 mg/l RRO (1.1 mg/l cleanup level), 0.8 mg/l DRO (1.5 mg/l cleanup level), and non-detect GRO in the groundwater samples collected. The monitoring well that had previously shown contamination over cleanup levels was not sampled this event because it was damaged. Depth to groundwater is 17 to 18 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater contamination concentrations increased in 0 of the 3 monitoring wells sampled. The monitoring wells were purged prior to sampling with a bladder pump.	Robert Weimer
5/8/2013	Update or Other Action	DEC confirmed that since the previous groundwater samples were collected after purging, that the DEC is not requesting a purge/no purge comparison sampling event for this site.	Robert Weimer
5/8/2013	Site Visit	Site visit to observe current site conditions.	Robert Weimer
5/17/2013	Document, Report, or Work plan Review - other	October 29, 2012 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event and it had 1.61 mg/l DRO (1.5 mg/l cleanup level), and non-detect benzene, RRO, and GRO in the groundwater. Depth to groundwater was 17 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump.	Robert Weimer
8/29/2013	Document, Report, or Work plan Review - other	March 30, 2013 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event and it was non-detect for benzene, GRO, DRO, and RRO. Depth to groundwater was 18.88 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump.	Robert Weimer
9/26/2013	Meeting or Teleconference Held	Discussed site status and future site work with Shell and their consultant. They will sample replacement monitoring well MW-3R in October for DRO and measure depth to groundwater.	Robert Weimer
11/26/2013	Document, Report, or Work plan Review - other	On October 21, 2012 monitoring well MW-3R was installed to replace monitoring well MW-3. Groundwater was encountered at 17.81 feet below ground surface. On October 29, 2012 a groundwater sample was collected that had 1.61 mg/l DRO, and non-detect for GRO, RRO, and benzene.	Robert Weimer
1/5/2014	Document, Report, or Work plan Review - other	On March 30, 2013 a groundwater sample was collected from monitoring well MW-3R that was non-detect for DRO, GRO, RRO, and benzene. Groundwater was encountered at 18.88 feet below ground surface.	Robert Weimer
1/6/2014	Document, Report, or Work plan Review - other	June 5, 2013 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event it was non-detect for benzene, GRO, DRO, and RRO. Depth to groundwater was 17.91 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was sampled both no purge with hydrasleeve and purged prior to sampling with a bladder pump. The sample intervals were not documented in the field notes or in the report so the results are considered biased low.	Robert Weimer
3/12/2014	Document, Report, or Work plan Review - other	August 7, 2013 groundwater monitoring event. Non-detect for benzene, RRO, DRO, and GRO in the groundwater. Only the new replacement monitoring well MW-3R was sampled this event. Depth to groundwater was 18.10 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump. Because the sample interval was not documented in the field notes or in the report the results may be biased low.	Robert Weimer
5/8/2014	Document, Report, or Work plan Review - other	October 10, 2013 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event and it was non-detect for DRO. Depth to groundwater was 17.60 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump. Because the sample interval was not documented in the field notes or in the report the results may be biased low.	Robert Weimer
10/20/2014	Offsite Soil or Groundwater Disposal Approved	ADEC approves request to treat 1 drum of contaminated purge water.	Robert Weimer
1/30/2015	Document, Report, or Work plan Review - other	August 8, 2014 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event and it had 0.0488 mg/l RRO, and non-detect DRO in the groundwater. Depth to groundwater was 18.26 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump. The pump intake was 0.44 feet below the surface of the groundwater.	Robert Weimer
1/26/2016	Document, Report, or Work plan Review - other	September 11, 2015 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event and it had 0.0525 mg/l RRO, and non-detect DRO in the groundwater. Depth to groundwater was 19.30 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump. The pump intake was 0.50 feet below the surface of the groundwater.	Robert Weimer
5/27/2016	Document, Report, or Work plan Review - other	ADEC approves work plan for the decommissioning of the one remaining monitoring well at the site (MW-3R). The well is to be decommissioned in accordance with ADEC requirements.	Robert Weimer
6/28/2016	Document, Report, or Work plan Review - other	ADEC receives documentation for the decommissioning of the one remaining monitoring well at the site (MW-3R). The well was decommissioned in accordance with ADEC requirements.	Robert Weimer
6/29/2016	Exposure Tracking Model Ranking	A new updated ranking with ETM has been completed for source area 77721 1990 contamination.	Robert Weimer
8/26/2016	Cleanup Complete Determination Issued	Soil and groundwater meet site cleanup levels. All monitoring wells have been properly decommissioned. Site closure letter was issue on August 25, 2016.	Robert Weimer

Action Date

Action

Description

DEC Staff

7/17/1989

Underground Storage Tank Site Characterization or Assessment

Summary of UST removal, soils excavation, and boring/monitoring well placement for further soil/groundwater assessment.

Former Staff

7/17/1989

Document, Report, or Work plan Review - other

Statewide Petroleum removed USTs and installed an upgraded system. Soil contamination encountered. 7 USTs removed. Up to 2,080 mg/kg GRO, 1,990 mg/kg DRO, 7.5 mg/kg benzene, and 0.144 mg/kg PCE in the samples collected from the excavations.

Former Staff

7/20/1989

Leaking Underground Storage Tank Corrective Action Underway

Plan to dispose of contaminated soils at the Regional Landfill or Anchorage Sand & Gravel, depending on soil sampling results. Approved by ADEC on 7/21/89.

Former Staff

7/20/1989

Offsite Soil or Groundwater Disposal Approved

AS&G processed 735 tons of soils from the site on 9/23/89. Documented in a letter to ADEC on 11/3/89.

Former Staff

7/21/1989

Release Investigation

Work plan for UST removal and site characterization submitted by ENSR.

Former Staff

9/7/1989

Leaking Underground Storage Tank Release Confirmed - Petroleum

LUST Site created in CSP for source area ID 77721 Petroleum hydrocarbon contamination found during UST removals.

Former Staff

9/7/1989

Site Added to Database

Former Staff

9/8/1989

Leaking Underground Storage Tank Cleanup Initiated - Petroleum

LCAU Date changed DB conversion.

Former Staff

11/21/1989

Document, Report, or Work plan Review - other

A water well survey in 1989 identified eleven potential drinking water wells within 1,000 feet of this site.

Former Staff

1/27/1990

Document, Report, or Work plan Review - other

In 1990 only two of the eleven potential drinking water wells were confirmed as in-use water wells. Those two drinking water wells were sampled and found free of petroleum contamination.

Former Staff

5/3/1990

Update or Other Action

ADEC requests private wells be sampled using EPA Method 503.1 and also requests a work plan for placing additional monitoring wells to assess the groundwater moving off site. Draft plan and sampling comments received by ADEC on 5/17/90. ADEC comments on 6/5/90, requests Texaco to determine if wells downgradient of site were properly closed. ENSR submits remedial action plan for the site on 6/5/90. A vapor extraction combined with a groundwater recovery and air stripping treatment system was recommended by ENSR.

Former Staff

8/1/1990

Document, Report, or Work plan Review - other

Additional soil borings and monitoring well placement for further site assessment in conjunction with site remediation. Quarterly monitoring results. Groundwater sampling on 8/21/90 showed a distinct decrease from sampling on 10/4/89. On 8/21/90 benzene was not detected in wells MW-2 through MW-6. Sample MMW-1 had 9.0 ppb benzene and 1,780 ppb xylene. Groundwater flows towards the west at a depth of about 20 feet below the surface.

Former Staff

7/22/1991

Offsite Soil or Groundwater Disposal Approved

Anchorage Sand & Gravel sent in receipts of soils processed at the Klatt road facility. Soils were blended with AC-5 for use as a black base material.

Former Staff

11/20/1997

Update or Other Action

ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: TEXACO REFINING & MARKETING INC.

Former Staff

3/19/2000

Document, Report, or Work plan Review - other

December 28, 2000 groundwater monitoring event. 5 monitoring wells sampled. Up to 0.14 mg/l DRO , and non-detect benzene and GRO in the groundwater. Depth to groundwater is 18.45 to 19.31 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have decreased.

Robert Weimer

5/14/2002

Meeting or Teleconference Held

As discussed in May 14, 2002 meeting soil contamination remains near monitoring well MMW-5 (stained soils at groundwater at 20 feet below ground surface, up to 4,820 mg/kg TPH), and soil boring MB-2 (up to 1,360 mg/kg TPH at 20 feet below ground surface).

Robert Weimer

8/31/2004

Meeting or Teleconference Held

Follow up meeting, as we discussed in May 14, 2002 meeting soil contamination remains near monitoring well MMW-5 (stained soils at groundwater at 20 feet below ground surface, up to 4,820 mg/kg TPH), and soil boring MB-2 (up to 1,360 mg/kg TPH at 20 feet below ground surface).

Robert Weimer

10/24/2005

Update or Other Action

Need soil confirmation samples for closure.

Robert Weimer

3/9/2007

Exposure Tracking Model Ranking

Site ranked on the new Exposure Tracking Model (ETM). The ETM is a new site ranking system that looks at, based on available data, the potential exposure pathways for the contamination remaining at the site.

Robert Weimer

7/8/2008

Document, Report, or Work plan Review - other

On January 30-31, 2008 six soil borings were sampled and groundwater samples were collected from two of the borings. No monitoring wells were installed. Up to 0.030 mg/kg benzene and non-detect PAHs, PCBs, GRO, DRO, and RRO in the soil samples collected and up to 2.06 mg/l DRO, 0.121 mg/l GRO, 0.668 mg/l RRO, 874 ug/l lead, 24.2 ug/l cadmium, 2,940 ug/l chromium, 1.04 ug/l benzene, and non-detect PAHs (except for 0.124 ug/l naphthalene and 0.121 ug/l phenanthrene), and PCBs in the two groundwater samples collected. Location MB-2 was sampled and appears to meet cleanup levels. Location MMW-5 was not assessed. Need monitoring wells/soil borings to define the extent of the contamination identified at this site (MMW-5 and the January 2008 contamination).

Robert Weimer

7/9/2008

Update or Other Action

Discussed site status with RP's consultant. They will talk with Shell about submitting a release investigation work plan. They plan to remove and assess the existing tank system on July 21, 2008.

Robert Weimer

7/21/2008

Site Visit

Site visit to observe removal of used oil tank and some of the product piping. Discuss site work with RP's consultant.

Robert Weimer

7/22/2008

Site Visit

Site visit to observe removal of gasoline tanks and some of the product piping. Discuss site work with RP's consultant.

Robert Weimer

7/28/2008

Site Visit

Site visit to discuss stockpile and excavation sampling with RP's consultant. They need to collect at a minimum analytical samples at the elevated northwest and northeast piping locations. Also it appears that the visibly stained soil in the used oil stockpile was not sampled, that soil will need to be treated or disposed of in an approved manner.

Robert Weimer

7/28/2008

Update or Other Action

ADEC conditionally approves the placement of the diesel (30 cy) and gasoline (220 cy) stockpiles back in the excavation pending submittal and final QA/QC review of the lab data. The 5 cubic yards of used oil contaminated soil that contains some visibly stained soil is not approved for use as backfill.

Robert Weimer

8/13/2008

Offsite Soil or Groundwater Disposal Approved

Review and approve request for disposal of 7 drums of used oil contaminated soil at an out of state landfill.

Robert Weimer

5/18/2009

Meeting or Teleconference Held

Discussed site with RP's consultant. They plan to sample all existing monitoring wells for BTEX, GRO, DRO, RRO, and the metals (lead, cadmium, and chromium) in June 2009. Based on a review of the results additional groundwater monitoring and/or monitoring wells may be required. Confirmation soil sampling for the two locations in the 2008 tank excavation and monitoring MMW-5 location will be required prior to site closure.

Robert Weimer

8/24/2009

Document, Report, or Work plan Review - other

June 12, 2009 groundwater monitoring event. Only 2 of the 5 monitoring wells sampled, they could not open the other 3 well caps. Up to 0.2 mg/l RRO, and non-detect benzene, GRO, DRO, and MTBE in the groundwater samples collected. Depth to groundwater is 18.65 to 18.66 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have decreased. Metals sampling was not conducted as requested.

Robert Weimer

9/22/2009

Document, Report, or Work plan Review - other

On July 2008 five underground storage tanks (one diesel, one used oil, and three gasoline tanks) and two hoists were removed. Contamination over cleanup levels was found at the used oil tank, tank 1, and tank 4. The used oil tank contamination was removed, but contamination remains over cleanup levels at tank #1 (T1-3-12, a duplicate of T1-1-12) with 0.0325 mg/kg benzene (0.025 mg/kg cleanup level), and tank #4 (T4-1-12) with 0.0296 mg/kg benzene. All of the metals detected appear to be at naturally occurring concentrations. For the PAH soil samples up to 0.0783mg/kg benzo(k)perylene, 0.0702 mg/kg chrysene, 0.0824 mg/kg fluoranthene, 0.0615 mg/kg pyrene, the rest of the PAHs were non-detect.

Robert Weimer

9/22/2009

Update or Other Action

Need monitoring wells and soil borings to define the extent of the contamination identified at this site. MMW-5 (stained soils at groundwater at 20 feet below ground surface, up to 4,820 mg/kg TPH), tank 4 (sample T4-1-12 had 0.0296 mg/kg benzene at 12 feet), tank 1 (sample T1-3-12 had 0.0325 mg/kg benzene at 12 feet) and the January 2008 temporary monitoring wells groundwater contamination (Up to 0.121 mg/l GRO, 2.06 mg/l DRO (1.5 mg/l cleanup level), 0.668 mg/l RRO, 874 ug/l lead, (15 ug/l cleanup level), 24.2 ug/l Cadmium (5 ug/l cleanup level), 2,940 ug/l Chromium (100 ug/l cleanup level) and 1.04 ug/l benzene in the groundwater).

Robert Weimer

10/2/2009

Update or Other Action

DEC letter to the RP requesting by December 1, 2009 a work plan for the installation of two monitoring wells at TKSB-7 and TKSB-8, and three soil borings at T1-3-12 (tank #1 for benzene at 12 feet below ground surface), T4-1-12 (tank #4 for benzene at 12 feet below ground surface), and just downgradient of MMW-5 (for BTEX, GRO, DRO, PAH, and RRO at 20 feet below ground surface). The groundwater in each of these monitoring wells be sampled, until further notice for BTEX, GRO, DRO, lead, cadmium, and chromium along with the other groundwater monitoring events at this site.

Robert Weimer

1/27/2010

Document, Report, or Work plan Review - other

September 17, 2009 groundwater monitoring event. 4 of the 5 monitoring wells sampled. Up to 1.2 ug/l benzene, non-detect (<0.1 mg/l) GRO, non-detect (<0.8 mg/l) DRO, non-detect (<1.0 ug/l) MTBE, non-detect (<5 ug/l) lead, and 0.48 mg/l RRO in the groundwater. Depth to groundwater is 19.00 to 19.98 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 1 of the 4 monitoring wells sampled.

Robert Weimer

3/15/2010

Document, Report, or Work plan Review - other

December 10, 2009 groundwater monitoring event. 4 of the 5 monitoring wells sampled. Up to 2.2 mg/l RRO, non-detect (<0.5 ug/l) benzene, non-detect (<0.1 mg/l) GRO, non-detect (<0.8 mg/l) DRO, non-detect (<1.0 ug/l) MTBE, non-detect (<5 ug/l) lead, non-detect (<5 ug/l) Cadmuim, and non-detect (<10 ug/l) Chromium in the groundwater. Depth to groundwater is 19.45 to 20.04 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 2 of the 4 monitoring wells sampled.

Robert Weimer

3/23/2010

Document, Report, or Work plan Review - other

DEC letter conditionally approving the drilling of 3 soil borings and installation of 2 monitoring wells. Conditions are that for the proposed monitoring wells MW-6 and MW-7 that a soil sample be collected at the soil/water interface, with an additional soil sample collected if a higher field reading is found at a different depth than the soil/water interface.

Robert Weimer

5/12/2010

Update or Other Action

Talked with Shell Oil's consultant (Delta) they plan to conduct the confirmation soil sampling and the installation of the 2 additional monitoring wells sometime between May 17 - May 21, 2010.

Robert Weimer

5/12/2010

Document, Report, or Work plan Review - other

March 18, 2010 groundwater monitoring event. 4 of the 5 monitoring wells sampled. Up to 1.4 ug/l benzene (5 ug/l cleanup level), 1.0 mg/l RRO (1.1 mg/l cleanup level), 8 ug/l lead (15 ug/l cleanup level), and non-detect GRO, DRO, Cadmuim, and Chromium in the groundwater. Depth to groundwater is 19.87 to 20.42 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 3 of the 4 monitoring wells sampled, but all samples meet site cleanup levels.

Robert Weimer

5/13/2010

Update or Other Action

Email from Shell Oil's consultant (Delta) they plan to begin the confirmation soil sampling and the installation of the 2 additional monitoring wells on May 17 - May 18, 2010. Field work is anticipated to take about 5 days. The report of the results of the soil and groundwater sampling is to be submitted about 2 months after that.

Robert Weimer

9/23/2010

Update or Other Action

Talked with Shell's environmental consultant (Delta) about the status of the report documenting the confirmation soil sampling and the installation of additional monitoring wells in May 2010. He said the draft report is still under review by Shell.

Robert Weimer

10/27/2010

Document, Report, or Work plan Review - other

May 19-20, 2010 groundwater monitoring event. 6 monitoring wells sampled. Up to 2.9 mg/l RRO, non-detect (<0.5 ug/l) benzene, non-detect (<0.1 mg/l) GRO, non-detect (<0.8 mg/l) DRO, non-detect (<5 ug/l) lead, non-detect (<5 ug/l) Cadmium, and non-detect (<10 ug/l) Chromium in the groundwater. Depth to groundwater is 19.51 to 21.42 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 1 of the 6 monitoring wells sampled.

Robert Weimer

11/1/2010

Site Characterization Report Approved

On May 17-20, 2010 four soil borings were sampled and one was completed as a monitoring well (MW-7). Up to 1.3 mg/kg cadium (5 mg/kg cleanup level), 49 mg/kg chromium (at naturally occuring background levels), 27 mg/kg lead (400 mg/kg cleanup level), non-detect (<1.5 mg/kg) GRO (300 mg/kg cleanup level), 24 mg/kg DRO (250 mg/kg cleanup level), 140 mg/kg RRO (10,000 mg/kg cleanup level), and 0.070 mg/kg benzene (0.025 mg/kg cleanup level). The highest benzene contamination was found at 18 feet below ground surface just above the soil/water interface at 20 feet below ground surface at monitoring well MW-7. One soil boring (SB-3, located near MMW-5) and one monitoring well MW-6 were not completed, they are to be completed this fall.

Robert Weimer

4/1/2011

Meeting or Teleconference Held

Discuss site status with RP's new consultant (CRA). They plan to drill the soil boring (SB-3, located near MMW-5) and install the monitoring well MW-6 that were not completed in 2010. They will also submit a plan to collect additional characterization data in the area of monitoring well MW-7 that had benzene over cleanup levels.

Robert Weimer

7/20/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water.

Robert Weimer

8/25/2011

Meeting or Teleconference Held

Meeting with Shell and CRA to discuss proposed site investigation work plan. The plan proposes to install one additional monitoring well and sample 5 other soil borings to assess current soil contamination concentrations in those areas. The hope is that the sampling will demonstrate that the site has remediated to site cleanup levels. CRA is to provide a revised work plan.

Robert Weimer

9/6/2011

Document, Report, or Work plan Review - other

September 21, 2010 groundwater monitoring event. 6 monitoring wells sampled. Up to 0.32 mg/l RRO, and non-detect for benzene, GRO, DRO, lead, Cadmuim, and Chromium in the groundwater. Depth to groundwater is 15.38 to 17.45 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have decreased in 6 of the 6 monitoring wells sampled.

Robert Weimer

9/7/2011

Document, Report, or Work plan Review - other

November 13, 2010 groundwater monitoring event. 6 monitoring wells sampled. Up to 2.11 mg/l DRO (1.5 mg/l cleanup level), and non-detect benzene, GRO, lead, Cadmuim, and Chromium in the groundwater. RRO was not analyzed this monitoring event. Depth to groundwater is 19.15 to 20.00 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 1 of the 6 monitoring wells sampled.

Robert Weimer

10/6/2011

Site Characterization Workplan Approved

Approved September 19, 2011 Site Investigation Work Plan. The plan calls for collecting confirmation soil samples from borings at 6 locations and complete one of them as a monitoring well (MW-6). MW-6 will be added to the current groundwater monitoring program.

Robert Weimer

10/13/2011

Site Visit

Site visit to observe release investigation site work.

Robert Weimer

12/6/2011

Offsite Soil or Groundwater Disposal Approved

ADEC approves request for disposal of contaminated soil, decon water, and purge water at facilities in Oregon and Nevada.

Robert Weimer

12/19/2011

Site Characterization Report Approved

March 2-6, 2011 groundwater monitoring event. 6 monitoring wells sampled. Up to 1.1 mg/l RRO (1.1 mg/l cleanup level), and non-detect benzene, GRO, DRO, lead, Cadmuim, and Chromium in the groundwater. Depth to groundwater was 19.70 to 20.35 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations have increased in 1 of the 6 monitoring wells sampled.

Robert Weimer

12/21/2011

Update or Other Action

ADEC approves reduction in groundwater monitoring at this site: Suspend all analytical sampling of the following monitoring wells: MW-1, MW-2, MW-3, MW-5, and MW-7, reduce analytical sampling of monitoring well MW-4 to DRO and RRO, and continue analytical sampling of monitoring well MW-6 for BTEX and GRO.

Robert Weimer

1/17/2012

Document, Report, or Work plan Review - other

May 25, 2011 groundwater monitoring event. 6 monitoring wells sampled. Up to 0.741 mg/l RRO (1.1 mg/l cleanup level), 0.77 ug/l chromium (100 ug/l cleanup level), and non-detect for benzene, GRO, DRO, lead, and cadmuim in the groundwater. Depth to groundwater was 19.91 to 20.55 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations were stable in the 6 monitoring wells sampled.

Robert Weimer

1/17/2012

Document, Report, or Work plan Review - other

August 2, 2011 groundwater monitoring event. 6 monitoring wells sampled. Up to 1.36 mg/l DRO (1.5 mg/l cleanup level), 3.07 mg/l RRO (1.1 mg/l cleanup level), and non-detect benzene, GRO, lead, cadmuim, and chromium in the groundwater. Depth to groundwater is 19.64 to 20.20 feet below ground surface. Historical groundwater flow direction is to the west and northwest. Groundwater contamination concentrations increased in 2 of the 6 monitoring wells sampled. Need continued quarterly groundwater monitoring to establish trends.

Robert Weimer

3/1/2012

Document, Report, or Work plan Review - other

November 9, 2011 groundwater monitoring event. 6 monitoring wells sampled including a new monitoring well MW-6 and a replacement monitoring well MW-4A that were installed in October/November 2011. Up to 2.16 ug/l lead, 5.74 ug/l chromium and non-detect benzene, GRO, DRO, RRO, and cadmuim in the groundwater. The monitoring well that had previously shown contamination over cleanup levels was not sampled this event because it was damaged. Depth to groundwater is 19 to 20 feet below ground surface. Historical groundwater flow direction is to the southwest. Groundwater contamination concentrations increased in 0 of the 6 monitoring wells sampled. Need continued quarterly groundwater monitoring to establish trends and repair monitoring well MW-3 so it can be sampled.

Robert Weimer

5/23/2012

Offsite Soil or Groundwater Disposal Approved

ADEC approved via email disposal of one drum of petroleum contaminated IDW soils generated at the facility for ultimate disposal at the Arlington landfill in Oregon.

Rich Sundet

7/11/2012

Document, Report, or Work plan Review - other

On October 2011 five soil borings were sampled and two monitoring wells (MW-4A and MW-6) were installed and sampled. Up to 0.0103 mg/kg benzene (0.025 mg/kg cleanup level), and non-detect PCE, PAHs, MTBE, GRO, DRO, and RRO in the soil samples collected.

Robert Weimer

7/11/2012

Update or Other Action

Based on the information provided DEC is not requesting any further sampling of monitoring wells MW-4A and MW-6. All of the site monitoring wells are approved to be decommissioned in accordance with the Department’s November 2011 Guidance. The last time monitoring well MW-3 was sampled (on 8/3/11) it showed contamination over cleanup levels for RRO and increasing DRO contamination near cleanup levels. The Department requests that once site construction is completed that a replacement long term monitoring well be installed (MW-3R), given site improvements as close as practicable to the MW-3 location for DRO and RRO groundwater sampling.

Robert Weimer

7/19/2012

Update or Other Action

ADEC requests documentation for the disposal of one drum of petroleum contaminated IDW soils generated at the facility at the Arlington landfill in Oregon.

Robert Weimer

10/30/2012

Offsite Soil or Groundwater Disposal Approved

ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water and 2 drums of contaminated soil.

Robert Weimer

2/12/2013

Document, Report, or Work plan Review - other

April 24, 2012 groundwater monitoring event. Only monitoring well MW-6 was sampled and it was non-detect for benzene and GRO. The monitoring well that had previously shown contamination over cleanup levels was not sampled this event because it was damaged. Depth to groundwater is 17 to 18 feet below ground surface. Groundwater flow direction was to the northwest. Need continued quarterly groundwater monitoring to establish trends and replace monitoring well MW-3 so it can be sampled.

Robert Weimer

2/13/2013

Offsite Soil or Groundwater Disposal Approved

ADEC approves request for transport and treatment of 1 drum of contaminated monitoring well purge water and 2 drums of contaminated soil.

Robert Weimer

2/14/2013

Document, Report, or Work plan Review - other

On October 21, 2012 replacement monitoring well MW-3R was installed. As per the approved work plan no soil samples were collected. Groundwater samples are to be collected in the future.

Robert Weimer

3/22/2013

Update or Other Action

ADEC is requesting that all sites where there has been no purge groundwater sampling conducted during the last year, that for the next sampling event that they do both no purge then purge sampling from each monitoring well, so we evaluate on a site specific basis whether no purge sampling has provided comparable data. The post purge well sampling for VOCs would need to be conducted via hydrasleeve, bladder pump, or in well pump. Non VOC sampling can be collected with a bailer or peristaltic pump (in addition to the VOC methods) if desired. The specific sampling methods will need to be documented in the report and included field notes. If there is not enough time to do this adjustment for the planned sample event of March 26-April 4, then we request it be done on the following event.

Robert Weimer

4/5/2013

Document, Report, or Work plan Review - other

June 13, 2012 groundwater monitoring event. Only monitoring well MW-6 was sampled and it was non-detect for benzene and GRO. The monitoring well that had previously shown contamination over cleanup levels was not sampled this event because it was damaged. Depth to groundwater is 17 to 18 feet below ground surface. Groundwater flow direction was to the southwest. Need continued quarterly groundwater monitoring to establish trends and replace monitoring well MW-3 so it can be sampled. The monitoring well was purged prior to sampling with a bladder pump.

Robert Weimer

4/16/2013

Document, Report, or Work plan Review - other

July 23, 2012 groundwater monitoring event. Up to 2.8 mg/l RRO (1.1 mg/l cleanup level), 0.8 mg/l DRO (1.5 mg/l cleanup level), and non-detect GRO in the groundwater samples collected. The monitoring well that had previously shown contamination over cleanup levels was not sampled this event because it was damaged. Depth to groundwater is 17 to 18 feet below ground surface. Groundwater flow direction was to the southwest. Groundwater contamination concentrations increased in 0 of the 3 monitoring wells sampled. The monitoring wells were purged prior to sampling with a bladder pump.

Robert Weimer

5/8/2013

Update or Other Action

DEC confirmed that since the previous groundwater samples were collected after purging, that the DEC is not requesting a purge/no purge comparison sampling event for this site.

Robert Weimer

5/8/2013

Site Visit

Site visit to observe current site conditions.

Robert Weimer

5/17/2013

Document, Report, or Work plan Review - other

October 29, 2012 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event and it had 1.61 mg/l DRO (1.5 mg/l cleanup level), and non-detect benzene, RRO, and GRO in the groundwater. Depth to groundwater was 17 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump.

Robert Weimer

8/29/2013

Document, Report, or Work plan Review - other

March 30, 2013 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event and it was non-detect for benzene, GRO, DRO, and RRO. Depth to groundwater was 18.88 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump.

Robert Weimer

9/26/2013

Meeting or Teleconference Held

Discussed site status and future site work with Shell and their consultant. They will sample replacement monitoring well MW-3R in October for DRO and measure depth to groundwater.

Robert Weimer

11/26/2013

Document, Report, or Work plan Review - other

On October 21, 2012 monitoring well MW-3R was installed to replace monitoring well MW-3. Groundwater was encountered at 17.81 feet below ground surface. On October 29, 2012 a groundwater sample was collected that had 1.61 mg/l DRO, and non-detect for GRO, RRO, and benzene.

Robert Weimer

1/5/2014

Document, Report, or Work plan Review - other

On March 30, 2013 a groundwater sample was collected from monitoring well MW-3R that was non-detect for DRO, GRO, RRO, and benzene. Groundwater was encountered at 18.88 feet below ground surface.

Robert Weimer

1/6/2014

Document, Report, or Work plan Review - other

June 5, 2013 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event it was non-detect for benzene, GRO, DRO, and RRO. Depth to groundwater was 17.91 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was sampled both no purge with hydrasleeve and purged prior to sampling with a bladder pump. The sample intervals were not documented in the field notes or in the report so the results are considered biased low.

Robert Weimer

3/12/2014

Document, Report, or Work plan Review - other

August 7, 2013 groundwater monitoring event. Non-detect for benzene, RRO, DRO, and GRO in the groundwater. Only the new replacement monitoring well MW-3R was sampled this event. Depth to groundwater was 18.10 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump. Because the sample interval was not documented in the field notes or in the report the results may be biased low.

Robert Weimer

5/8/2014

Document, Report, or Work plan Review - other

October 10, 2013 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event and it was non-detect for DRO. Depth to groundwater was 17.60 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump. Because the sample interval was not documented in the field notes or in the report the results may be biased low.

Robert Weimer

10/20/2014

Offsite Soil or Groundwater Disposal Approved

ADEC approves request to treat 1 drum of contaminated purge water.

Robert Weimer

1/30/2015

Document, Report, or Work plan Review - other

August 8, 2014 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event and it had 0.0488 mg/l RRO, and non-detect DRO in the groundwater. Depth to groundwater was 18.26 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump. The pump intake was 0.44 feet below the surface of the groundwater.

Robert Weimer

1/26/2016

Document, Report, or Work plan Review - other

September 11, 2015 groundwater monitoring event. Only the new replacement monitoring well MW-3R was sampled this event and it had 0.0525 mg/l RRO, and non-detect DRO in the groundwater. Depth to groundwater was 19.30 feet below ground surface. Groundwater flow direction is historically to the northwest to southwest. The monitoring well was purged prior to sampling with a bladder pump. The pump intake was 0.50 feet below the surface of the groundwater.

Robert Weimer

5/27/2016

Document, Report, or Work plan Review - other

ADEC approves work plan for the decommissioning of the one remaining monitoring well at the site (MW-3R). The well is to be decommissioned in accordance with ADEC requirements.

Robert Weimer

6/28/2016

Document, Report, or Work plan Review - other

ADEC receives documentation for the decommissioning of the one remaining monitoring well at the site (MW-3R). The well was decommissioned in accordance with ADEC requirements.

Robert Weimer

6/29/2016

Exposure Tracking Model Ranking

A new updated ranking with ETM has been completed for source area 77721 1990 contamination.

Robert Weimer

8/26/2016

Cleanup Complete Determination Issued

Soil and groundwater meet site cleanup levels. All monitoring wells have been properly decommissioned. Site closure letter was issue on August 25, 2016.

Robert Weimer

Contaminant Information

Name	Level Description	Media
DRO	< Method 2 Most Stringent	GroundwaterSoil
GRO	< Method 2 Most Stringent	GroundwaterSoil
RRO	< Method 2 Most Stringent	GroundwaterSoil
Benzene	< Method 2 Most Stringent	GroundwaterSoil
Lead - Dissolved	< Table C	Groundwater
Cadmium - Dissolved	< Table C	Groundwater
Chromium - Dissolved	< Table C	Groundwater
Tetrachloroethene	< Method 2 Most Stringent	Soil

Name

Level Description

Media

Comments

DRO

< Method 2 Most Stringent

GroundwaterSoil

GRO

< Method 2 Most Stringent

GroundwaterSoil

RRO

< Method 2 Most Stringent

GroundwaterSoil

Benzene

< Method 2 Most Stringent

GroundwaterSoil

Lead - Dissolved

< Table C

Groundwater

Cadmium - Dissolved

< Table C

Groundwater

Chromium - Dissolved

< Table C

Groundwater

Tetrachloroethene

< Method 2 Most Stringent

Soil

Control Type

Type	Details
No ICs Required

Type

Details

No ICs Required

Requirements

Description	Details
Advance approval required to transport soil or groundwater off-site.
Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)

Description

Details

Advance approval required to transport soil or groundwater off-site.

Movement or use of contaminated material (including on site) in a manner that results in a violation of the water quality standards is prohibited (18 AAC 70)

Closure letter 8-25-2016

No associated sites were found.

Missing Location Data

Because the GIS location data for this site has not been entered, we cannot direct you to its position on the map. Click "Continue" to proceed to the Contaminated Sites Web Map or "Close" to return to the site report.

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Alaska Department of Environmental Conservation

Site Report: Texaco #50

Site Chronology

IC / Closure Details

Documents

Associated Sites

Problems/Comments

Action Information

Contaminant Information

Control Type

Requirements

Closure letter 8-25-2016

Missing Location Data

State of Alaska Department of Environmental Conservation