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Site Report: Anchorage Chrysler Dodge Center


Site Name: Anchorage Chrysler Dodge Center
Address: 2601 E. 5th Ave.; , Anchorage, AK 99501
File Number: 2100.26.129
Hazard ID: 23804
Status: Active
Staff: Robert Weimer, 9072697525 Robert.Weimer@alaska.gov
Latitude: 61.218254
Longitude: -149.834331
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.

Problems/Comments

A gasoline and a used oil tank were removed in 1989. 1,000 cubic yards of contaminated soils were excavated and later treated. Composite soil samples documented contamination left in place at the UST excavation up to 842 ppm TPH. Three soil borings/monitoring wells were sampled on May 18-19, 1989. Analytical data indicates that soil contamination occurs within a localized area. The groundwater is about 38' below the surface. Up to 0.584 mg/kg Tetrachloroethylene (PCE) was detected in soil boring samples from monitoring wells #2 and #3. Also up to 0.079 mg/kg benzene (0.025 mg/kg cleanup level) at 40 feet bgs in well #2. The groundwater sample collected from well #2 had 128 ug/l benzene (5 ug/l cleanup level), and 10.4 mg/kg TPH (1 mg/l cleanup level). The groundwater sample from monitoring well #2 had 854 ug/l benzene on 5/7/90. The groundwater flows toward the northwest and is about 38' below the surface. On January 2014 four soil borings were sampled to help assess current soil contaminant concentrations in the location of the former tanks. One sample (SB2-10) collected at 31.8 to 35 feet below ground surface near groundwater had 761 mg/kg DRO. On July 2015 one monitoring well was installed (MW-4) and sampled, and sample four borings were sampled to help define the extent of the soil and groundwater at this site. Up to 1,270 mg/kg DRO, 0.269 mg/kg 1-Methylnaphtalene, 0.371 mg/kg 2-Methylnaphalene, 0.306 mg/kg Naphthalene, 117 ug/l 1,2,4-Trimethylbenzene, and 0.206 mg/kg Pyrene in the soil samples collected. Up to 0.637 mg/l GRO, 0.784 mg/l DRO, 13.9 ug/l Naphthalene, non-detect benzene and RRO in the one groundwater sample (plus its duplicate) collected from monitoring well MW-4. The sample concentrations exceeded proposed groundwater cleanup levels for Naphthalene (1.65 ug/l), and 1,2,4-Trimethylbenzene (14.6 ug/l). The soil samples collected in the center of the former tank excavation and the northwest corner of the excavation at the soil/water interface exceeded DRO cleanup levels. The extent of the soil and groundwater contamination at this site has not been defined. The consultant recommends that monitoring wells MW1, MW2, and MW3 be repaired so surface runoff does not continue to end the monitoring wells. In the fall of 2016 two soil borings were sampled and completed as monitoring wells (MW5 and MW6) to help define the remaining soil and groundwater contamination at this site. Historically depth to groundwater has ranged from 37.51 to 39.46 feet below ground surface and the groundwater flow direction has ranged between to the west by northwest to the northeast.

Action Information

Action Date Action Description DEC Staff
4/27/1989 Leaking Underground Storage Tank Release Confirmed - Petroleum LUST Site created in CSP for source area ID 77981 ADD; Gasoline, BTEX, & TPH. * Not Assigned
4/27/1989 Site Added to Database * Not Assigned
4/28/1989 Leaking Underground Storage Tank Cleanup Initiated - Petroleum LCAU; :LCAU Date changed DB conversion * Not Assigned
5/3/1989 Report or Workplan Review - Other SI; Water well survey: 1 well within 1/4 mile; 11 wells within 1/2 mile. Not stated which wells are active. * Not Assigned
5/11/1989 Report or Workplan Review - Other SI; Woodward Clyde confirmed gasoline contamination at site. TPH was highest in composite of in place soil Sample A at 842 mg/kg & BTEX at 40.87 mg/kg. Recommends that remediation method be vapor extraction for contamination by unleaded gasoline. * Not Assigned
5/18/1989 Leaking Underground Storage Tank Corrective Action Underway REM; Martech proposes to send gasoline contaminated soils to Anchorage Sand & Gravel for processing. DEC approved plan 5/22/89 and requested copies of EPA method 8020 and modified 418.1 analyses before and after processing. On the order of 1,000 cubic yards excavated while removing USTs at the site. * Not Assigned
6/8/1989 Report or Workplan Review - Other REM; Letter from AS&G stating that 489.20 tons of fuel contaminated soils were processed and blended with AC-5 for use as non spec black base material. Analysis results included with letter. * Not Assigned
6/21/1989 Report or Workplan Review - Other Waste oil contamination lab results received from Martech. Total petroleum hydrocarbon contamination ranged from 0 to 1,740 mg/kg. Gasoline contamination TPH ranged from non-detect to 683 mg/kg. * Not Assigned
6/22/1989 Report or Workplan Review - Other SI; Woodward Clyde submitted report that shows groundwater flows northwesterly and contamination does occur. Three soil borings/monitoring wells were sampled on May 18-19, 1989. Analytical data indicates that soil contamination occurs within a localized area. The groundwater is about 40' below the surface. Up to 0.584 mg/kg (0.024 mg/kg cleanup level) Tetrachloroethylene (PCE) was detected in soil boring samples from monitoring wells #2 and #3. Also up to 0.079 mg/kg benzene (0.025 mg/kg cleanup level) at 40 feet bgs in well #2. The groundwater sample collected from well #2 had 128 ug/l benzene (5 ug/l cleanup level), and 10.4 mg/kg TPH (1 mg/l cleanup level). * Not Assigned
6/30/1989 Underground Storage Tank Site Characterization or Assessment SA1R; Reviewed a phase 1 site assessment report. * Not Assigned
8/11/1989 Update or Other Action RAPR; Letter to S. Petito: Need additional soil cleanup before groundwater monitoring proposal can be accepted, request that plan for additional soil cleanup work address cleanup of petroleum and chlorinated organic compounds in soils, and disposal of stockpiled waste soil. * Not Assigned
5/24/1990 Update or Other Action RAPR; Martech proposed to use soil washing (Martech's Soil Washer) to reduce total petroleum hydrocarbon contamination levels below 1,000 mg/kg. Wash water filtered through activated charcoal filter system to bring discharge water within drinking water standards. Plan approved contingent on wash water disposed of in accordance with all applicable federal, state and municipal law, soils transported as covered load, soils to be transported to landfill for final disposal by 7/15/90 with receipt confirming final disposal. * Not Assigned
6/26/1990 Report or Workplan Review - Other MS; Martech sends in lab results from monitoring wells. In wells 1 & 3, parameters were non-detectable and well 2 had benzene levels at 854 ug/l and toluene at 2,620 ug/l. Remediation test at well 2 using appropriate techniques if after next quarter benzene is still greater than 200 ug/l. * Not Assigned
11/8/1990 Update or Other Action REM; Martech USA, Inc. sends letter stating that Municipality landfill denied acceptance of stockpiled material. Sampling results show TPH 562 mg/kg, lead 34.3 mg/kg, arsenic 3.2 mg/kg, chromium 19.9 mg/kg. Currently storing material in super sacks until processing through the soil washer can be completed. * Not Assigned
1/9/1991 Report or Workplan Review - Other Martech sampling results from May 90 and December 90 show that parameters in well 1 & 3 are non-detectable. Well 2 benzene levels decreased from 854 to 311 ug/l. Depth to groundwater was from 37.51 to 38.90 below ground surface. The groundwater flow direction was toward to northwest these two monitoring events. * Not Assigned
3/15/1991 Report or Workplan Review - Other MS; Martech sent in monitoring well survey & sampling results for March. Benzene was down from 311 to 161 ug/l. Depth to groundwater was from 38.00 to 39.46 below ground surface. The groundwater flow direction was toward to northwest this monitoring event. * Not Assigned
6/10/1991 Report or Workplan Review - Other Martech sent in results of monitoring well survey & sampling. Well 2 had 157 ug/l benzene in June 1991 down from 311 ug/l in Dec. 1990, but still above cleanup levels. Depth to groundwater was from 38.00 to 38.90 below ground surface. The groundwater flow direction was toward to northeast this monitoring event. Propose to resample in Dec. 91 since benzene & other parameters continue to drop. * Not Assigned
7/31/1991 Update or Other Action F; Martech sent in a proposed soil treatment plan involving bioremediation. Plan is approved with a stipulation that an interim report be sent no later than 7/30/92 summarizing remediation efforts & effectiveness of the bioremediation project, including analytical data. If efforts do not appear to be successful, an additional plan may be requested at that time. * Not Assigned
10/13/1994 Report or Workplan Review - Other LCAR; Performed a Corrective Action Report review. Stockpile treated at ASR. * Not Assigned
10/19/1994 Update or Other Action Request for Semi-Annual BTEX GW Monitoring for monitoring well #2. Daniel Rogers
12/19/1994 Report or Workplan Review - Other Up to 88.6 ug/l benzene in groundwater at monitoring well MW-2. Robert Weimer
8/9/1995 Report or Workplan Review - Other Up to 319 ug/l benzene in groundwater at monitoring well MW-2. Robert Weimer
12/20/1995 Report or Workplan Review - Other Up to 285 ug/l benzene in groundwater at monitoring well MW-2. Robert Weimer
6/16/1996 Report or Workplan Review - Other Up to 19.1 ug/l benzene in groundwater at monitoring well MW-2. Robert Weimer
1/20/1997 Report or Workplan Review - Other Up to 32.5 ug/l benzene in groundwater at monitoring well MW-2. Robert Weimer
11/20/1997 Update or Other Action ADEC sends Notification of Intent to Cost Recover Letter to Current Owner: ANCHORAGE CHRYSLER CENTER INC. * Not Assigned
1/9/1998 Report or Workplan Review - Other Up to 20.1 ug/l benzene in groundwater at monitoring well MW-2. Robert Weimer
6/25/1998 Report or Workplan Review - Other Up to 5.12 ug/l benzene in groundwater at monitoring well MW-2. Robert Weimer
4/7/1999 Report or Workplan Review - Other Up to 7.07 ug/l benzene in groundwater at monitoring well MW-2. Robert Weimer
10/13/2004 Update or Other Action Talked with service manager for RP, he will look for any work done since 1994 and submit the results. Robert Weimer
10/19/2004 Update or Other Action Reviewed files at RP's office, got copies of monitoring reports (1995-1997) that were not in our files. The March 1997 report shows groundwater still contaminated (up to 32.5 ug/l benzene), and recommend further sampling. Robert Weimer
11/3/2004 Report or Workplan Review - Other RP faxed additional groundwater monitoring reports from 1998 and 1999. Robert Weimer
11/4/2004 Update or Other Action Talked with RP, he will contact consultant to take another groundwater sample for BTEX, GRO, DRO. If results are good the consultant is to submit a plan for collecting confirmation soil samples to determine if the in-situ soils have naturally attenuated to default cleanup levels. Robert Weimer
11/17/2004 Report or Workplan Review - Other 11/5/04 groundwater sampling. 0.43 mg/l DRO, 0.62 mg/l GRO, and non detect for benzene. Need confirmation soil samples. Robert Weimer
10/13/2005 Update or Other Action Need confirmation soil samples to evaluate site for closure. Robert Weimer
4/18/2008 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
7/1/2010 Update or Other Action Discuss site status with owners consultant. He will prepare a work plan for taking confirmation samples. Robert Weimer
8/25/2010 Site Characterization Workplan Approved The August 2010 work plan proposes to drill four soil borings and to collect soil samples at the above referenced site to assess whether any soil contamination remains above site cleanup levels. Based on the information provided the work plan is approved under the following conditions: 1. Section 4.1: Each of the four proposed soil borings are to be drilled to below groundwater (estimated to be 40 feet below ground surface) with field screening readings collected at least every 2.5 feet from the ground surface to groundwater, including a field screening reading at the soil/water interface. For soil borings ANC-SB-1, ANC-SB-2, and ANC-SB-3 confirmation soil samples are to be collected from native soils within 2 feet below the depth of backfill in each soil boring location. A confirmation soil sample will be collected at the soil/water interface in soil boring ANC-SB-4. An additional confirmation soil sample will be collected from each boring at the highest field screening depth if that depth is different than the confirmation samples listed above. 2. Section 5.1: Add VOC analysis to the BTEX, GRO, and DRO laboratory soil sample analytical methods proposed. In addition PAH analysis is to be conducted at the highest 1 field screening location. 3. Section 11: A complete copy of the field notes is to be included with the project report. 4. Figure 2: Move proposed boring ANC-SB-4 to between the former excavation and monitoring well MW-2. 5. DEC requests to be notified at least 48 hours prior to the soil sampling work being conducted. Robert Weimer
3/4/2013 Update or Other Action To date have not received results of conditionally approved work plan for taking confirmation soil samples so the site can be evlauated for possible closure. One of the conditions was the DEC be notified at least 48 hours prior to conducting the work. Robert Weimer
12/16/2013 Update or Other Action Called Steve Ercison of Anchorage Chrysler Dodge to check on status of release investigation work at the site. A work plan was conditionally approved on August 25, 2010, but DEC has not received the results since then. Need the results of the work or an update on when the work is going to be conducted. Robert Weimer
12/16/2013 Update or Other Action Call from the RPs current consultant (BGES) they did some site sampling work in 2011 for a property transfer. They will get permission from the RP to submit a copy of that report. Robert Weimer
1/9/2014 Site Visit Site visit to go over confimation sampling locations. The northwest monitoring well was missing its plug to keep surface runoff from entering the monitoring well. They said they would get plug for that monitoring well. The consultant BGES said they expect to conduct the confirmation sampling in about two weeks. Robert Weimer
1/22/2014 Site Visit Site visit to observe confimation soil sampling. They are sampling 4 soil borings to check the current soil concentrations in the former tank excavation and just down gradient of the excavation. Groundwater was encountered around 38 feet below ground surface. The northwest monitoring well (MW-2) had its missing plug replaced to keep surface runoff from entering the monitoring well. The southwest monitoring well (MW-1) was found to be missing a plug and full of dirt. Robert Weimer
11/14/2014 Report or Workplan Review - Other On January 2014 four soil borings were sampled to help assess current soil contaminant concentrations in the location of the former tanks. One sample (SB2-10) collected at 31.8 to 35 feet below ground surface near groundwater had 761 mg/kg DRO. Need replacement monitoring wells and additional soil samples to define the nature and extent of the remaining soil and groundwater contamination. Robert Weimer
11/18/2014 Update or Other Action ADEC letter requests that RP submit, by January 18, 2015, a work plan (including a schedule for conducting the work) for conducting a release investigation in the soil and groundwater for this remaining contamination. ADEC requests that the work plan include the installation and sampling of at least one monitoring well at the source area and soil borings to define the extent of the soil contamination. Robert Weimer
6/11/2015 Report or Workplan Review - Other ADEC provides comments on the proposed release investigation work plan. Robert Weimer
6/15/2015 Report or Workplan Review - Other ADEC approves revised release investigation work plan. The work plan proposes to install and sample one monitoring well (VOC, GRO, DRO, RRO, and one for PAH), repair the two existing monitoring wells, sample four borings (DRO and one for PAH) to help define the extent of the soil and groundwater at this site. Robert Weimer
8/22/2016 Report or Workplan Review - Other In July 2015 one monitoring well was installed (MW-4) and sampled, two existing monitoring wells were checked (MW2 had no sheen on the water, MW3 could not be accessed by the well cap could not be opened), and sample four other borings were sampled to help define the extent of the soil and groundwater at this site. Up to 1,270 mg/kg DRO, 0.269 mg/kg 1-Methylnaphtalene, 0.371 mg/kg 2-Methylnaphalene, 0.306 mg/kg Naphthalene, 117 ug/l 1,2,4-Trimethylbenzene, and 0.206 mg/kg Pyrene in the soil samples collected. Up to 0.637 mg/l GRO, 0.784 mg/l DRO, 13.9 ug/l Naphthalene, non-detect benzene and RRO in the one groundwater sample (plus its duplicate) collected from monitoring well MW-4, which had water at 39.33 feet below ground surface. The groundwater samples were collected using a bladder pump after purging within the top foot of the water column as required. The sample concentrations exceeded proposed groundwater cleanup levels for Naphthalene (1.65 ug/l), and 1,2,4-Trimethylbenzene (14.6 ug/l). The soil samples collected in the center of the former tank excavation and the northwest corner of the excavation at the soil/water interface exceeded DRO cleanup levels. The extent of the soil and groundwater contamination at this site has not been defined. Robert Weimer
8/24/2016 Update or Other Action ADEC letter requesting that the RP submit by September 24, 2016, a work plan (including a schedule for conducting the work) for conducting a release investigation in the soil and groundwater for this remaining contamination. ADEC requests that the work plan include the installation and sampling of additional soil borings and monitoring wells to define the extent of the soil and groundwater contamination. ADEC requests the work plan include the repair of MW1, MW2, and MW3 to prevent surface water from flowing into the monitoring well casings. ADEC further requests that the work plan include the sampling of the four current monitoring wells and any future monitoring wells on a semi-annual basis for DRO and PAHs. Robert Weimer
9/21/2016 Report or Workplan Review - Other ADEC conditionally approves BGES’s September 20, 2016 release investigation work plan for the Anchorage Chrysler Dodge, 2501 East 5th Avenue site. The work plan proposes to repair of MW1, MW2, and MW3 in May/June 2017 to prevent surface water from flowing into the monitoring well casings, the sampling of two soil borings and potential of completing them as monitoring wells in July 2017, and the sampling of the four current monitoring wells and any future monitoring wells on a semi-annual basis for DRO and PAHs starting in August 2017. The work plan is approved under the following conditions: 1. The two proposed soil boring be sampled and completed as monitoring wells by November 21, 2016. 2. The monitoring well repairs be completed by November 21, 2016. 3. The first semi-annual monitoring event be conducted by November 23, 2016. 4. Submit the sampling report by January 23, 2017. 5. Conduct the second semi-annual monitoring approximately 6 months after the first monitoring event, and submit a report of the results of that sampling event within 60 days of the sampling. Robert Weimer
11/23/2016 Update or Other Action Request from consultant to not complete the two proposed borings as monitoring wells if based on field observations during the sampling of the soil borings they do not appear to be contaminated. Given that historically the groundwater has flowed to the north and northeast, ADEC has concerns that the extent of the soil and groundwater contamination has not been defined in that direction. ADEC requests that the borings be completed as monitoring wells as proposed in the work plan. Robert Weimer
1/17/2017 Update or Other Action DEC approves request for extension to submit report on February 3, 2017, for the winter 2016 release investigation work. Robert Weimer
1/23/2017 Offsite Soil or Groundwater Disposal Approved DEC approves request to transport 1.5 cubic yards of contaminated drill cuttings to ASR for thermal treatment. Robert Weimer
1/23/2017 Offsite Soil or Groundwater Disposal Approved DEC approves request to dispose of 3 cubic yards of contaminated drill cuttings at the Anchorage Regional Landfill. Robert Weimer
4/25/2017 Report or Workplan Review - Other October 26, 2016 groundwater monitoring event. Up to 0.767 mg/l DRO, 1.63 ug/l Naphthalene, 1.01 ug/l 1-methylnaphthalene, 0.523 ug/l 2-methylnaphthalene, 0.0638 ug/l fluorene, and non-detect for other PAHs in the four groundwater monitoring wells sampled. Depth to groundwater was 38.53 to 39.55 feet below ground surface. The groundwater samples were collected using a bladder pump after purging within the top foot of the water column as required. The four monitoring wells were repaired and resurveyed. Groundwater flow direction was to the west by northwest. Robert Weimer
4/25/2017 Report or Workplan Review - Other On November 29-30, 2016 two soil borings were sampled and completed as monitoring wells (MW-5 and MW-6). Up to 31.9 mg/kg RRO, 0.00697 mg/kg 2-methylnaphthalene, and non-detect for other PAHs and DRO in the soil samples collected. Robert Weimer
4/25/2017 Report or Workplan Review - Other December 2, 2016 groundwater monitoring event. Only the two new monitoring wells (MW-5 and MW-6) were sampled and were non-detect for DRO and PAHs. Depth to groundwater was 38.78 to 39.77 feet below ground surface. The groundwater samples were collected using a bladder pump after purging within the top foot of the water column as required. Groundwater flow direction was to the northwest. Robert Weimer
10/17/2017 Report or Workplan Review - Other June 7-8, 2017 groundwater monitoring event. All six site monitoring wells were sampled and were non-detect for DRO and had up to 0.168 ug/l 1-Methylnaphthalene and 0.0968 ug/l Naphthalene. Depth to groundwater was 39.19 to 39.70 feet below ground surface. The groundwater samples were collected using a bladder pump after purging within the top foot of the water column as required. Groundwater flow direction was to the northwest. Purge water is currently stored on-site. Robert Weimer

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