| Action Date |
Action |
Description |
DEC Staff |
| 1/14/2010 |
Document, Report, or Work plan Review - other |
On this date ADEC received CF/SBS Building Subsurface Soil Sampling Report, submitted by Clarus, dated January 14, 2010. On September 29, 2009, petroleum-impacted soil was encountered during a site assessment of a 2,000-gallon underground heating oil tank, a large portion of which was built into and underneath the building. Four soil samples: two-2 feet north of the tank, one-12 feet north of the tank, and one-5 feet east of the tank; collected at the groundwater interface,5 feet bgs; contained DRO up to 10,700 mg/kg and benzene up to 0.0624 mg/kg. |
Grant Lidren |
| 1/26/2010 |
Site Added to Database |
A new site has been added to the database |
Mitzi Read |
| 1/26/2010 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 78850 name: 2,000-gallon Underground HOT |
Mitzi Read |
| 5/13/2010 |
Document, Report, or Work plan Review - other |
On this date, ADEC approved: a work plan for a UST removal; and transportation of associated contaminated soil. In mid May 2010, Clarus will remove a heating oil unregulated UST and excavate and transport 50 tons of contaminated soil to ASR. Three confirmation soil samples will be collected from the base of the excavation and analyzed for DRO and BTEX. |
Grant Lidren |
| 7/13/2010 |
Document, Report, or Work plan Review - other |
On this date, ADEC received the UST Removal Report CF/SBS Building, submitted by Clarus and dated July 9, 2010. A 5,000 gallon UST and associated piping were removed on May 4, 2010. The bottom of the UST was located at 4 feet bgs. A small pinhole was noted on the southeast upper edge of the UST. Forty cubic yards of contaminated soil were removed to the best extent practicable due to the proximity of the building, and treated at ASR. Three soil samples collected from the sidewalls of the excavation, at the groundwater interface at 3.5 ft. bgs, contained DRO up to 23, 800 mg/kg. Benzene was not detected but the detection limit was elevated up to 0.0427 mg/kg. the excavation was backfilled with clean fill. |
Grant Lidren |
| 4/3/2012 |
Meeting or Teleconference Held |
Per a meeting with ARRC on this date, the onsite building has been decommissioned. the concrete foundation remains. The ARRC plans to remove the foundation in the future. Contaminated soil at this site will be addressed at this time. The groundwater at the site need to be evaluated in the future. |
Grant Lidren |
| 10/6/2015 |
Potentially Responsible Party/State Interest Letter |
PRP letter sent to ARRC on this date |
Grant Lidren |
| 10/13/2015 |
Site Visit |
On this date, ADEC met with FES and ARRC during removal of two 2,000-gallon regulated Gasoline and diesel USTs (see file: 2100.26.602). Contamination was encountered beneath at least one of the tanks evident by a petroleum odor and gray stained soil. FES collected analytical soil samples. ARRC will address contamination next year in conjunction with contaminated soil removal at the former 2,000 gallon HOT and groundwater investigation. |
Grant Lidren |
| 8/4/2016 |
Site Characterization Workplan Approved |
ADEC reviewed the Contaminated Soil Removal Work Plan, Rev1 801 W. First Ave submitted by FES and dated July 29, 2016. ADEC has no objections to the Work Plan and FES may proceed pending the following comments:1)Up to two soil samples will be collected from each soil boring; one from the groundwater interface and one from the highest elevated pid reading. If there are no elevated pid reading and or visual/olfactory evidence of contamination, then only the one soil sample needs to be collected from the groundwater interface. 2)ADEC recommends a low PID threshold for both excavations to ensure contaminated soil is removed to the best extent practicable. However, if FES thinks the threshold of 50 ppm and 10 ppm is sufficient to guide the excavation of contaminated material, ADEC has no objections. Note: if significant contamination remains it will have to be further evaluated/excavated at a later date. Additionally, in accordance with the field sampling guidance, analytical soil samples will need to be collected from the highest pid sample locations, which may be well below the 50 ppm and 10 ppm threshold.
|
Grant Lidren |
| 1/23/2017 |
Site Characterization Report Approved |
On this date, ADEC received the 2016 Soil Removal Report, Rev 1 submitted by FES dated January 23, 2017. A total of 540 tons of petroleum contaminated soil was removed. Approximately 10 tons was removed from the north excavation (former underground HOT) and 530 tons was removed from the south excavation (former regulated USTs 3 & 4). Soil was excavated to the groundwater interface: 3 feet bgs at the north excavation and 6 feet bgs at the south excavation. At the north excavation, nine soil samples collected from the sidewalls just above the groundwater interface at 2 to 2.5 feet bgs. Only one of these samples taken from the south sidewall contained contaminant concentrations above cleanup levels with naphthalene up to 0.0757 mg/kg. Soil samples were not collected from the excavation floor due to standing water. At the south excavation, contaminated soil was noticeably stained gray with a petroleum odor and the excavation floor was partially filled with groundwater leading to limited sampling. A total of twenty-four soil samples collected from the excavation floor at 6 feet bgs and the sidewalls at 4 to 5 feet bgs contained contamination concentrations above cleanup levels with DRO up to: 2,610 mg/kg; GRO up to 1,650 mg/kg; benzene up to 2.73 mg/kg; toluene up to 10.5 mg/kg; ethylbenzene up to 78.5 mg/kg; xylenes up to 403 mg/kg; 1,2,4 trimethylbenzene up to 287 mg/kg; 1,3,5 trimethylbenzene up to 62.9 mg/kg; propyl benzene up to 41 mg/kg; naphthalene up to 36 mg/kg; isopropylbenzene up to 17.2 mg/kg; n-propylbenzene up to 30.3 mg/kg and sec-butylbenzene up to 5.44 mg/kg. Contamination remains at both the north and south excavation. |
Grant Lidren |
| 8/9/2017 |
Site Characterization Workplan Approved |
On this date, ADEC approved the ARRC Consolidated Freightways / SBS Building Site Characterization Work Plan (Rev 1.1) ADEC File No: 2100.38.514 and 2100.26.602 |
Grant Lidren |
| 9/25/2017 |
Offsite Soil or Groundwater Disposal Approved |
On this date, ADEC approved the transport of three 55-gallon drums of drill cutting IDW to ASR for thermal remediation. |
Grant Lidren |
| 3/19/2018 |
Site Characterization Report Approved |
On this date, ADEC reviewed and approved the Consolidated Freightways/ SBS Building Site Characterization Report submitted by RSE and dated March 2018. Seven soil borings were advanced 12 feet bgs and completed as monitoring wells. Groundwater was encountered at 8 to 12 feet bgs. Groundwater at the former USTs 3 and 4 south location contained a visual sheen. A fuel odor was present in a majority of borings at the fine sand/silty layer at 6 feet bgs. Two soil samples were collected per boring at the groundwater interface and highest PID reading. Two soil borings (RSE-1 and RSE-2) advanced northeast of the former north heating oil underground tank did not contain contaminant concentrations above method two cleanup levels. Four soil borings (RSE-3 to RSE-6) advanced adjacent to the former USTs 3 & 4 south excavation contained benzene up to 0.248 mg/kg, ethylbenzene up to 1.54 mg/kg, xylenes up to 4.94 mg/kg, 1,2,4-trimethylbenze up to 5.32 mg/kg, 1,3,5-trimethylbenze up to 1.75 mg/kg, naphthalene up to 0.589 mg/kg and 1-methylnapthalene up to 0.530 mg/kg (note: RSE-3 did not contain contaminant above cleanup levels). One boring (RSE-7) advanced to the assumed upradient location at the south edge of the property did not contain contaminant concentrations above method two cleanup levels. Monitoring wells RSE-1 and RSE-2 contained DRO up to 3.94 mg/L and RRO up to 3.22 mg/L(note: RSE-1 GW sample was not properly preserved in the field with HCL). Monitoring wells RSE-1, RSE-2, RSE-4, RSE-5, and RSE-6 contained DRO up to 4.32 mg/L, RRO up to 1.24 mg/L, GRO up to 3.84 mg/L, benzene up to 38 ug/L, ethylbenzene up to 213 ug/L, xylenes up to 837 ug/L, 1,2,4-trimethylbenze up to 544 ug/L, 1,3,5-trimethylbenze up to 149 ug/L, naphthalene up to 104 ug/L and 1-methylnapthalene up to 45.9 ug/L, and 2-methylnapthalene up to 82 ug/L (note: RSE-4 GW sample was not properly preserved in the field with HCL). RSE-3 did not contain contaminant concentrations above table C cleanup levels. RSE-7 contained bromodichloromethane and chloroform up to 1.40 ug/L and 6.32 ug/L respectively. |
Grant Lidren |
| 5/21/2018 |
Site Characterization Workplan Approved |
On this date, ADEC received the ARRC Consolidated Freightways / SBS Building Groundwater Monitoring Work Plan ADEC File No: 2100.38.514 and 2100.26.602 submitted by RSE dated May 21, 2018. The seven onsite MWs will be analyzed for GRO, DRO, RRO, VOCs, and PAHs. |
Grant Lidren |
| 3/28/2019 |
Site Characterization Report Approved |
On this date, ADEC reviewed and approved the Consolidated Freightways/ SBS Building Site Groundwater Monitoring Report submitted by RSE and dated July 2018. The seven monitoring wells RSE-1 through RSE-7 were sampled. Monitoring wells: RSE-4, RSE-5, and RSE-6 (located adjacent to the two former 2,000 gallon gas and diesel USTs south excavation) contained contaminant concentrations above table C cleanup levels with: DRO up to 4.77 mg/L; GRO up to 5.50 mg/L; benzene up to 80.2 ug/L; ethylbenzene up to 413 ug/L; xylenes up to 1,220 ug/L; 1,2,4-trimethlbezene up to 927 ug/L; 1,3,5-trimethylbenzene up to 132 ug/L; naphthalene up to 125 ug/L; 1-methylnapthalene up to 26.8 ug/L and 2-methylnapthalene up to 40.8 ug/L. A sheen was observed on the RSE-4 purge water and a fuel odor was detected at RSE-5. RSE-1 and RSE-2 (located east-northeast of the former 5,000 gallon underground HOT north excavation) contained contaminant concentrations above table C cleanup levels with DRO up to 1.68 mg/L and RRO up to 1.62 mg/L. Monitoring wells RSE-3 and RSE-7 did not contain contaminant concentrations above cleanup levels. Groundwater general flows to the northeast |
Grant Lidren |
| 7/2/2019 |
Site Characterization Workplan Approved |
On this date, ADEC received the ARRC Consolidated Freightways / SBS Building
2019 New Monitoring Well Installation and Groundwater Assessment Work Plan Rev. 2.0 - ADEC File Nos. 2100.38.514 & 2100.26.602 |
Grant Lidren |
| 3/6/2020 |
Site Characterization Report Approved |
On this date, ADEC received the ARRC Consolidated Freightways/SBS Building Letter Report for ARRC 801 W. Ship Creek Avenue 2019 New Monitoring Well Installation and Groundwater Assessment Rev. 3.0 submitted by RSE and dated March 10, 2020. The seven historic monitoring wells RSE-1 through RSE-7 were sampled and three borings were advanced and completed at monitoring wells RSE-8, RSE-9, and RSE-10. Two soil samples were collected from each boring: one at the groundwater interface (at 5 to 7 feet bgs) and one at the highest pid reading (1 to 5 feet bgs). RSE-8 contained a hydrocarbon odor at 1 foot bgs and was the only boring that contained soil contaminant concentrations above cleanup levels. Soils samples collected from RSE-8 from a depth of 3.5 feet bgs and 6.0 feet bgs contained napthalene up to 0.229 mg/kg, benzene up to 0.428 mg/kg, and 1,2,4-TMB up to 0.765 mg/kg. Slight hydrocarbon odors were noted during monitoring wells sampling of RSE-4 and RSE-9. Monitoring wells: RSE-4, RSE-5, RSE-6, and RSE-8 (located adjacent to the two former 2,000 gallon gas and diesel USTs south excavation) contained contaminant concentrations above table C cleanup levels with: DRO up to 5.41 mg/L; GRO up to 5.45 mg/L; benzene up to 193 ug/L; ethylbenzene up to 382 ug/L; xylenes up to 1,600 ug/L; 1,2,4-trimethlbezene up to 927 ug/L; 1,3,5-trimethylbenzene up to 1,090 ug/L; naphthalene up to 137 ug/L. RSE-1 RSE-2, and RSE-10 (located east-northeast of the former 5,000 gallon underground HOT north excavation) contained contaminant concentrations above table C cleanup levels with DRO up to 1.68 mg/L and RRO up to 2.23 mg/L. Monitoring wells RSE-3, RSE-7, and RSE-9 did not contain contaminant concentrations above cleanup levels. The groundwater gradient was relatively flat with a southern trend towards RSE-7 and some slight mounding at RSE-5. It was noted the irregular groundwater gradient may be due to tidal flux, disturbances due to excavation, and precesence of utilities such as a perforated stormdrain at base of retaining wall south of RSE-7. |
Grant Lidren |
| 10/1/2020 |
Site Characterization Workplan Approved |
On this date, ADEC received and approve the Corrective Action Plan: ARRC Consolidated Freightways / SBS Building ADEC File Nos. 2100.38.514 and 2100.26.602: 2020 801 West 1st Avenue submitted by RSE and dated October 1, 2020. Contaminated soil will be removed from both the north and south excavations below the shallow groundwater and be transported to ASR for thermal remediation. Monitoring wells RSE-5 and RSE-6 will need to be removed during this work and replaced at a later date. Some soil may be temporarily stockpiled on site. After contaminated soil is removed, confirmation soil samples will be collected from the depths of the excavation. The groundwater from remaining onsite monitoring wells will also be sampled. The soil removal work will require dewatering of the shallow groundwater from the excavation, treated with a GAC, and discharged into the storm water pipe. The discharge water will be analyzed for TAH and TAqH prior to discharge. This work is being permitted by the ADEC Division of Water and includes a BMP plan and a dewatering plan. |
Grant Lidren |
| 5/3/2021 |
Document, Report, or Work plan Review - other |
On this day, ADEC received a report for additional site characterization and interim removal of petroleum contaminated soil at Consolidated Freightways/SBS Building USTs (Hazard IDs: 25488 and 26578). Site activities included excavation of contaminated soils and dewatering at the North location of one former UST and at the South location of 2 former USTs. In total, approximately 163 CY of soil was removed from the North UST and 1,100 CY of soil was removed from the South UST location and transported to Alaska Soil Recycling (ASR) for thermal treatment. A total of 10,870 gallons of groundwater was pumped to a 500 gallon settling tank and then through a 50-micron particulate filter and two 55 gallon GAC canister filters. Treated groundwater was monitored for sheen, TAH, and TAqH and other parameters listed in AKG002000 prior to discharging to MOA’s Storm Drain System. In addition, as the southern excavation was advanced, four monitoring wells (RSE-3, RSE-4, RSE-5, and RSE-6) were removed. The workplan for this projected indicated all removed wells would be replaced at a later date.
Soil sampling results from the excavation margins of the North UST location indicate DRO, RRO, GRO were all below migration to groundwater (MTG) cleanup level (CLs). Samples collected from the center and east portion of the North UST excavation extents primarily exceeded the MTG CL for naphthalene (5 samples ranging from estimated 47.0 to 395 µg/Kg). Sample ARRC-A43, a centrally located bottom sample, exceeded the MTG CLs for 1,2,4-Trimethylbenzene, 1,3,5-Trimethylbenzene, Benzene, Naphthalene, and total Xylenes. North UST sample results show elevated Naphthalene levels in two sample locations on the east sidewall and one south sidewall sample location.
Soil sampling results from the excavation margins of the South UST location indicate all analytes collected from the approximate northeast half of the excavation were below MTG CLs. Soil sampling results collected from the southwest half of the excavation indicate MTG CL exceedances are still present including: Benzene (12 samples ranging from 45 to 5,390 µg/kg), Ethylbenzene (6 samples ranging from 495 to 2,690 µg/kg), total Xylenes (5 samples ranging from 2,120 to 10,400 µg/kg), and Naphthalene (4 samples ranging from 41.3 to 691 µg/kg). East of the South UST excavation a line formerly believed to be a fuel line was also investigated. Upon further inspection, the pipe is was confirmed by electricians to be more consistent with electrical conduit. Approximately, 60’ of the conduit was removed and the remainder extending eastward remains in-situ. Samples collected from beneath the line about 50 feet east of the main excavation area and yielded DRO at 532 mg/Kg (ARRC-23). A sample located 10 feet west of ARRC-23 was measured with 199 mg/Kg DRO (ARRC-22). All other screening under and around the conduit including the interior yielded background PID values.
Due to the presence of peat and other organics, four soil samples (ARRC-93, ARRC-150, ARRC-214, ARRC-A31) were collected from the excavation floor to be analyzed for total organic carbon (TOC) analyses yielding 6.84%, 8.6%, 10.1% and 10.0 % TOC respectively. TOC analyses was performed in the event that organic soil yielded DRO results that could potentially be from naturally occurring organics. The report concludes that the organic soil did not yield significant DRO due to biogenic compound interference. |
Jamie Grant |
| 6/16/2021 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 78850 2,000-gallon Underground HOT. |
Jamie Grant |
| 8/3/2021 |
Meeting or Teleconference Held |
Meeting with ARRC and RSE to discuss site and plans for 2021/2022. |
Jamie Grant |
| 8/19/2021 |
Document, Report, or Work plan Review - other |
ADEC has reviewed and approved a revised site characterization work plan received on 8/11/2021. The work plan outlines installation of 5 borings/monitoring wells to delineate soil and groundwater down-gradient of contamination in the southern excavation with the option for additional step-out borings if needed. One monitoring well will be installed down-gradient of the northern excavation. Groundwater elevations and groundwater samples will be collected from each of the existing and new monitoring wells. All soil and groundwater samples will be evaluated for GRO, DRO, RRO, Petro-VOCs, and PAHs. Groundwater in the perforated corrugated metal pipe (CMP) and verticals located at the base of a retaining wall that is down-gradient from both excavations will also be evaluated to determine if this may be a preferential pathway. |
Jamie Grant |
| 12/2/2021 |
Meeting or Teleconference Held |
On this day, ADEC met with ARRC to discuss preliminary results from recent work and remaining data gaps. |
Jamie Grant |
| 3/10/2022 |
Site Characterization Workplan Approved |
On February 28, 2022 ADEC received a workplan outlining the collection of groundwater samples from 12 monitoring wells, up to 3 storm drain samples, and conducting a groundwater elevation survey. ADEC has reviewed and approved the work outlined in the plan. |
Jamie Grant |
| 10/11/2023 |
Long Term Monitoring Workplan or Report Review |
Approved Work Plan for groundwater monitoring from 12 wells. |
Michael Hooper |
