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Site Report: Alaska Real Estate Parking Lot


Site Name: Alaska Real Estate Parking Lot
Address: 717 East 4th Avenue, Between Gambell & Hyder, Anchorage, AK 99501
File Number: 2100.38.434
Hazard ID: 4084
Status: Active
Staff: Grant Lidren, 9072698685 grant.lidren@alaska.gov
Latitude: 61.218994
Longitude: -149.870301
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

The site's main contaminant of concern is tetrachloroethylene (PCE). This site is contaminated with PCE above ADEC soil/groundwater cleanup levels and above screening levels for vapor intrusion risks. The primary zone of soil contamination falls in an area of approximately 28,000 square feet around the former new method and C&K Cleaners, which operated at the site from 1955 to 1969. The vertical extent of PCE contamination is known to extend to at least a depth of 50 feet below ground surface (bgs), but the total extent is unknown. The PCE plume extends northeasterly across 3rd Avenue and down the bluff towards the Alaska Railroad Corporation’s Anchorage Terminal Reserve and Ship Creek. Involved parcel addresses include: 717(Lot 8A), 725 (Lot 10), and 735 (Lot 12) East 4th Avenue.

Action Information

Action Date Action Description DEC Staff
9/17/2004 Update or Other Action BGES reported releases detected from hydraulic lifts and dry cleaners from investigation work in which BGES removed about 10 cy of contaminated soil with hydraulic fluid contamination and stockpiled on site pending DEC approval for transport off site. David Pikul
9/22/2004 Update or Other Action DEC approved transport and disposal of 10 cubic yards of soil to ASR for thermal treatment. The soil was generated during soil test pit investigation at the site. David Pikul
9/22/2004 Site Added to Database Tetrachloroehylene and DRO. Sarah Cunningham
9/23/2004 Update or Other Action On 9/23/04, BGES submitted their report "Lots 8A, 10, 11, and 12; Block 26A; East Addition Phase II Environmental Site Assessment" dated 9/04. In the report, BGES noted that they performed field work in 8/04 in which the excavated 6 test pits, removed 5 hydraulic lifts, removed 4 USTs (2 hyraulic oil and 2 heating fuel oil), and removed some associated contaminated soil. Limited soil sampling was performed but test results showed that DRO was detected up to 408 mg/kg and PCE was up to 4.09 mg/kg. David Pikul
9/23/2004 Site Ranked Using the AHRM Initial ranking. Sarah Cunningham
10/1/2004 Meeting or Teleconference Held DEC met with the RP (Paul Maney) and his consultant (BGES) to discuss their proposed course of action. Soil contamination has been identified. On-site MW-1 will be sampled to identify any groundwater issues related to soil contamination. Next action will be discussed after groundwater data review. David Pikul
10/19/2004 Site Characterization Workplan Approved DEC completed review of the document titled: Groundwater Monitoring Work Plan, Lots 8A, 10, 11 and 12, Block 26A, East Addition, Anchorage, Alaska dated October 4, 2004 and approved the plan for implementation. MW-1 will be sampled and analyzed by EPA Method 8260B. David Pikul
12/17/2004 Update or Other Action DEC completed review of the BGES November 2004 dated groundwater sampling report titled "Lots 8A, 10, 11, and 12, Block 26A, East Addition Groundwater Sampling." Only MW-1 was sampled and it was sampled for VOCs. MW-1 contained 2.28 mg/l PCE. Water depth is 38.77 feet bgs. Chemical parameters collected in the field in 2004 indicates that the contaminated aquifer is aerobic, e.g., the oxidation-reduction potential is about 300 millivolts David Pikul
12/20/2004 Meeting or Teleconference Held DEC met with the RP (Paul Maney) and his consultant (BGES) to discuss next actions. BGES will submit work plan for further investigation to include soil borings, monitoring wells and a well search. David Pikul
2/7/2005 Update or Other Action DEC completed review of the draft BGES work plan dated 1/21/05 for additional site investigation. Minimal comments regarding soil sample collection during soil boring advancement will be discussed with the RP's consultant. David Pikul
2/14/2005 Update or Other Action DEC had brief discussion with Keith Guyer regarding the need for continuous soil collection from the ground surface down to the water table in the proposed soil borings. Keith agreed and will revise and resubmit the 1/21/05 BGES work plan. David Pikul
2/28/2005 Update or Other Action CS conditionally approved of BGES's 2/16/05 dated revised workplan to perform a drinking water well search and install 2-3 monitoring wells. David Pikul
3/1/2005 Update or Other Action LC 14144960 established for the site. David Pikul
4/8/2005 Update or Other Action On 4/8/05, CS approved transport of soil cuttings in 8 drums from work performed by BGES at the site during monitoring well installation in 2005. Transport was with Emerald for disposal of the waste as hazardous waste. David Pikul
6/6/2005 Update or Other Action On 6/6/05, DEC received BGES report "Fourth Avenue and Gambell Street Phase II Environmental Site Assessment" dated 5/05. The report documented BGES' March and April 2005 work performed under its approved workplan to perform a drinking water well survey, advance three borings and complete as monitoring wells, survey the monitoring wells, and sample soil and groundwater. Their May 2005 report of this work showed the following: while five drinking water wells were located through a file search within ¼ mile of the site, none were observed during a subsequent field reconnaissance; PCE exceeded applicable 18 AAC 75.341 and 18 AAC 75.345 cleanup levels in soil and groundwater, respectively (PCE was detected in soil throughout all three of the borings to the water table ranging from 0.542 to 79.5 mg/kg with the greatest concentrations between 18 ft. below ground surface and the water table; PCE was detected in groundwater in the three new and existing MW-1 from 0.372 to 1.790 mg/L); groundwater flowed to the northeast at a gradient of about 0.01 ft./ft.; and chemical parameters from groundwater were similar to that reported in 2004 which indicates that the aquifer is still aerobic. David Pikul
9/19/2005 Update or Other Action On 9/19/05, DEC received a copy of a letter with accompanying correspondence from John Houlihan of Short Cressman & Burgess representing Skinner Corporation to Robert Erwin representing Fourth Avenue Gambell Limiited Partnership. The letter was in response to Erwin's 6/17 and 7/25/05 letters concerning Skinner Corporation's ownership of the property and purported reporting requirements. Part of the attachments to the 9/14/05 letter from Houlihan was a copy of the Environmental Project Management, Inc. (EPMI) 12/8/1997 report "4th and Gambell Phase II. The report documented that EPMI performed a limited investigation in 1997 that included installation of three monitoring wells and excavation of three trenches in a drum/septic tank area near the former dry cleaning facility(ies) where four empty buried drums were found that indicated that the contents were to be used for dry cleaning operations, detection of underground storage tanks (USTs) at the site, and sampling that showed volatile organic compounds (VOCs) in soil and groundwater (e.g., in soil PCE to 4.5 mg/kg, cis 1,2-dichloroethylene (cis DCE) up to 0.8 mg/kg, toluene up to 9.0 mg/kg, 1,3,5 trimethylbenzene up to 49.5 mg/kg, and 1,2,4 trimethylbenzene up to 178.0 mg/kg, n-butylbenzene up to 19.8 mg/kg, sec-butylbenzene up to 15.6 mg/kg, and p-isopropyltoluene up to 102.0 mg/kg. ) and in groundwater (i.e., PCE up to 4.25 mg/L), and lead in soil (up to 996 mg/kg). While not above current cleanup levels, residual range organics (RRO) was detected up to 4,830 mg/kg and diesel range organics (DRO) up to 223 mg/kg in soil. Groundwater elevation findings from the 1997 EPMI report indicates groundwater flows to the northeast and at about a 0.0125 ft./ft. gradient. Rich Sundet
6/7/2006 Potentially Responsible Party/State Interest Letter On 6/7/06, a PRP letter was issued to Paul Maney of Alaskan Real Estate, Inc. the current property owner. David Pikul
9/21/2006 Update or Other Action On 9/21/06, DEC received a submittal from counsel Lawrence Albert regarding his client Fouth Avenue Gambell Limited Partnership's report "Environmental Assessment Fiinal Report for The Fourth Avenue Gambell" by Enviroameria, Inc. dated 1/29/1993. This was a phase I report providing a file review and field inspection report of the site. No apparent sampling was performed during this investigation. Rich Sundet
1/17/2007 Potentially Responsible Party/State Interest Letter A PRP letter was issued on 1/17/07 to Skinner Corporation. Rich Sundet
1/24/2007 Update or Other Action On 1/24/07, DEC conditionally approved of BGES, Inc.’s work plan titled “Phase II Environmental Site Assessment, Monitoring Well Installation, Lots 8A, 10, 11 and 12 Block 26A, East Addition, Anchorage, Alaska” dated 9/15/05. The plan was submitted via e-mail to CSP on 1/16/07. While the plan is dated 2005, DEC had no record of it being submitted previously to DEC – although Mr. Dave Pikul of CSP recalled discussing the proposal in 2005 with Bob Braunstein of BGES. The plan proposes installation of one up-gradient monitoring well on the subject lots and collection of soil and groundwater data from the boring/well. On 1/16, Braunstein clarified that three soil samples would be collected from the boring as described on page 3 of the plan and will be sent to the laboratory for EPA Methodology 8260 analysis if detections are determined using on site field screening instrument (i.e., PID). In addition, groundwater elevations will be determined for each of the existing monitoring wells and the new proposed well on site, and soil samples will be collected and combined from five shallow locations on the property. While DEC approved of the workplan, because past data showed that contaminants exceed applicable cleanup levels esp. PCE, DEC requested an additional workplan by 3/30/07. The workplan was requested to better characterize the site both horizontally and vertically, including proposing additional soil monitoring well installations both on and off the subject property to delineate the contaminant plume. Rich Sundet
2/6/2007 Update or Other Action On 2/6/07, DEC granted a 60 day extension request until 4/23/07 for Skinner Corp. to respond to DEC's 1/17/07 PRP letter. DEC recevied the request via facsimile from Short Cressman & Burgess PLLC on 2/5/07. DEC also noted that it would be coordinating with members of Short Cressman & Burgess to provide them information also requested on 2/5/07 in a public information request regarding this site. Rich Sundet
4/2/2007 Update or Other Action On 4/2/07 in response to a 3/23/07 request by BGES for a two month extension to provide a workplan (which was due to CS on 3/30/07), CS notified Paul Maney that it denied the extension request. However, because of his moving offices, CS did grant the extension request until 4/18/2007 to submit the workplan. CS also notified Maney that it expected the work plan be implemented by June 30, 2007. Rich Sundet
4/23/2007 Exposure Tracking Model Ranking Initial ranking Todd Blessing
4/25/2007 Update or Other Action On 4/26/07, CS conditionally approved work plan recieved on April 18, 2007. This work plan was preperred by BGES and is dated the same day it was received (i.e. April 18, 2007). BGES proposes, within the work plan, to do the following: Request access from off-site property owners to install groundwater monitor wells; Conduct utility locates; Advance five shallow soil borings on the subject properties and two soil borings downgradient of the subject properties; Complete two of the soil borings advanced downgradient of the subject properties as monitor wells; Continuously sample soil during advancement of shallow soil borings on the subject properties; one sample will be collected per soil boring (based on field screening results) and submitted to a DEC approved laboratory to be analyzed for GRO, DRO, RRO, total organic carbon (TOC), volatile organic compounds (VOC’s), and Resource Conservation and Recovery Act (RCRA) metals; Collect six soil samples (three per soil boring) during advancement of soil borings on downgradient properties to be analyzed for GRO, DRO, RRO, TOC, VOC’s, and RCRA metals at a DEC approved laboratory; soil samples will be collected from the following depths: 0 to 15 foot below ground surface (bgs), 15 to 30 foot bgs, and 30 to 45 foot bgs; Sample groundwater in two new monitor wells, two historical monitor wells (installed by EPMI Inc. in 1997), and four existing monitor wells to analyzed for GRO, DRO, RRO, VOC’s, and RCRA metals at a DEC approved laboratory; Sample groundwater from monitor well MW-3 and one newly installed monitor well to be analyzed for metabolic acids, nitrates, sulfate, sulfide, carbon dioxide, methane, ethane, and ethane, total dissolved iron and manganese; Collect samples in accordance to specified quality assurance/quality control procedures as outlined in 18 AAC 78 Procedures Manual; Develop a Conceptual Site Model (CSM); and Validate the quality of the analytical data by completing the CSP’s data review checklist CSP approves of the work plan, dated April 18, 2007, with the following modifications: 1) Collect two soil samples from each shallow soil boring advanced on the subject properties to evaluate the risks posed to human health and the environment on a pathway specific basis; one sample will be collected from surface soil (i.e. depth of 0 to 2 foot bgs) while the other sample will be collected from subsurface soil (i.e. depth of 2 to 15 foot bgs); soil samples collected from subsurface soil can be selected based on field screening results; soil samples will be analyzed for GRO, DRO, RRO, TOC, VOCs, and RCRA metals at a DEC approved laboratory; 2) Complete a data review of the CSP checklist for each laboratory data deliverable; 3) Deliver a final report to CSP within 60 days following completion of field work; and, 4) Notify CSP at least two days prior to commencement of field work to allow CSP staff to inspect the work activities. CS also recommends that BGES personnel sample and purge groundwater in accordance with EPA’s low flow (minimal drawdown) technique (EPA/540/S-95/504). Todd Blessing
3/13/2008 Update or Other Action DEC has reviewed a report titled “Fourth Avenue and Gambell Street (Lots 8A, 10, 11, and 12, Block 26A, East Addition) Anchorage, Alaska Additional Site Assessment.” BGES personnel advanced five shallow soil borings to depth of 15 feet below ground surface (bgs) on the western portion of the site. Soil samples were collected at depths of 0-2 feet bgs (surface soil) and 2 to 15 feet bgs (subsurface soil). In surface soil samples, detected levels of arsenic, chromium, and tetrachloroethylene (PCE) exceeded DEC cleanup values for migration to groundwater and outdoor inhalation established in 18 AAC 75.341 Table B1. The levels of PCE in shallow soil samples ranged from 1.35 to 13.2 mg/kg. In subsurface soil samples, detected levels of arsenic, chromium, tetrachloroethylene (PCE), and trichloroethylene (TCE) exceeded DEC cleanup values for migration to groundwater established in 18 AAC 75.341 Table B1. In these samples, PCE ranged from 0.865 to 821 mg/kg. BGES personnel installed three new monitor wells, one within the site boundaries, and the two others approximately 75 feet north and northeast of the site. Groundwater flow direction was determined, at this time, to flow northeast. Groundwater samples were collected from all existing and newly installed wells and analyzed for contaminants of concern. In groundwater samples, PCE was the only contaminant of concern detected at levels that exceeded the 18 AAC 75.345 Table C value of 0.005 mg/l. PCE levels ranged from 0.00510 to 0.822 mg/L and increased in groundwater samples collected off-site and downgradient of the site. DEC issued a letter dated March 13, 2008 requesting that Mr. Maney hire a qualified person to issue a site investigation work plan to CSP by June 15, 2008. Todd Blessing
5/1/2008 Update or Other Action DEC staff prepared a letter addressed to Lawrence Albert. The letter was prepared to address Mr. Albert’s issues he raised in his letter to Commissioner Hartig dated April 15, 2008. We noted in our letter that we recognize the financial costs associated with environmental assessment and cleanup work and we are willing to consider a phased approach to the matter. We requested that his client provide the specified financial documentation that would substantiate their claim of financial hardship. We in conjunction with State of Alaska Attorney General’s Office also will require time and effort to evaluate the corporate liability of others but there is an immediacy to evaluate human health risks. We asked that Mr. Albert provide his client’s willingness or ability to perform the immediate (or interim) assessment of contaminant vapor risks at residences in the area. Todd Blessing
7/28/2008 Cleanup Assumed by ADEC DEC has reviewed and approved a July 2008 Site Characterization Work Plan for the 4th and Gambell property. The work plan was prepared by Oasis Environmental, and was received at DEC’s Anchorage Office on July 22nd. In June of this year, DEC made a determination to hire a qualified third party to evaluate the risks to human health and the environment from contaminant migration north of the Alaska Real Estate Parking Lot. Oasis was selected as the qualified third party and was tasked with developing the work plan under Notice-to-Proceed 18-9028-13-52. A Notice to Proceed (NTP) to Oasis on June 9th to facilitate the construction of the July 2008 Site Investigation Work Plan. Oasis proposes to do the following north of the site during the summer of 2008: 1. Advance six soil borings to determine the nature and extent of contamination. 2. Install and sample two temporary well points and sample two existing monitor wells to evaluate contaminant impacts to groundwater. 3. Complete a conceptual site model to identify the pathways and receptors for contaminants of concern. Todd Blessing
9/22/2008 Update or Other Action DEC staff reviewed Oasis' "Site Characterization, 4th and Gambell Site, Alaska Real Estate Parking Lot", dated September 2008. Oasis personnel drilled six soil borings, installed two temporary well points, and sampled soil and groundwater. The investigation focused on determining the levels of PCE in soil and groundwater in a residential area north of the property. Field screening and analytical results indicate that much of the area of the former C&K Cleaners and the residential area north of the property has concentrations of PCE in vadose zone soil that exceed DEC cleanup values for migration to groundwater and in some instances, ingestion and inhalation. Near the location of the former C&K Cleaners, PCE contamination starts at the ground surface and extends to the groundwater table at roughly 40 feet below ground surface. At locations on the residential property to the north, PCE contaminated soil appears to begin at approximately 10 feet below ground surface and extends to the groundwater table. PCE has been detected in groundwater at the subject property and to the north at levels that groundwater cleanup levels. In soil samples, PCE ranged from 280 to 54,0000 parts per billion. In groundwater samples, PCE ranged from nondetect to 1,600 parts per billion. Todd Blessing
1/2/2009 Site Characterization Workplan Approved DEC staff reviewed Oasis’ “Vapor Intrusion Assessment Work Plan, 4th and Gambell, Anchorage, Alaska” dated December 2008. Oasis proposed to do the following: 1. Collect four exterior shallow soil gas samples (during winter and summer) to be analyzed for volatile organic compounds (VOCs) by Air Toxics, LTD. 2. Collect four indoor air samples (during winter and summer) to be to be analyzed for VOCs by Air Toxics, LTD. 3. Collect two outdoor air samples (during winter and summer) to be analyzed for VOC by Air Toxics, LTD. 4. Revise the conceptual site model following review and interpretation of results and determine if residents of buildings on Lots 1-6A, Block 26A East Addition are being exposed to VOCs vapors indoors at unacceptable levels. DEC issued a letter on Junuary 2, 2009 approving of the work plan provided the final soil gas and air sampling locations are approved by DEC. Todd Blessing
9/11/2009 Site Characterization Report Approved DEC staff reviewed the results of two vapor intrusion events (one in March and the next in June). Oasis Environmental installed three soil gas probes and collected indoor and outdoor air samples on Lots 1-6, Block 26A East Addition. PCE was detected at levels in shallow soil gas and within occupied buildings that exceed DEC’s vapor intrusion target levels established in the July 2009 Draft Vapor Intrusion Guidance Document for Contaminated Sites. PCE soil gas levels ranged from 17 to 13,000 µg/m3 and indoor/crawl space air levels ranged from nondetect to 170 µg/m3. ADEC’s residential target levels for PCE in shallow soil gas and indoor air are 41 and 4.1 µg/m3, respectively. The landowner for lots 1-3 (i.e. Mark Cupples) installed sub-membrane depressurization systems in two duplexes on his property. In the southern duplex, the system reduced PCE gas was not detected in crawl space air. In the northern duplex, PCE gas was reduced however, PCE was still detected at a level of 74 µg/m3. Todd Blessing
12/2/2009 Site Characterization Workplan Approved DEC staff reviewed and approved of Oasis “Additional Site Characterization Work Plan, 4th and Gambell, Anchorage, Alaska” Dated November 2009. Within the work plan, Oasis proposed to collect soil gas, indoor air, and outdoor air samples during the winter and spring at the five residential buildings north of the 4th and Gambell site. Additionally, they proposed to deploy a grid of passive soil gas samples in the vicinity of the 4th and Gambell site to delineate the source area of vadose-zone and groundwater contamination north and east of the site. Todd Blessing
12/11/2009 Update or Other Action DEC letters were issued requesting permission to the State of Alaska, Department of Environmental Conservation, its contractors, agents and employees, to enter upon our land in and/or in the vicinity of Block 26B, East Addition Subdivision, Anchorage Recording District, for the purpose of surface and subsurface investigation for hazardous substances. This permission shall include the right to take samples of materials, including but not limited to soil, soil gas, air and water, by standard approved methods, to bring onto said lands such equipment and personnel necessary for the accomplishment thereof, including to take soil, soil gas, indoor air, outdoor air, and groundwater samples. The State shall take all reasonable precautions to avoid damaging said lands and the appurtenances thereon, and in the event that any damage results from such investigations, the State, by making such entry, agrees to compensate the undersigned for such damage. Prior to entering upon land pursuant to this Limited Right of Entry, the State or any of its contractors or employees shall (1) notify the undersigned of the time and place of the anticipated entry, and (2) afford the undersigned an opportunity to have one or more of its officials, employees, agents, or attorneys present during such entry. This permission shall terminate twenty four (24) months from the date of execution of this Limited Right of Entry, unless extended or previously terminated in writing. Todd Blessing
12/21/2009 Update or Other Action DEC staff recieved permission from John Tatham, owner of Lots 1-3 and 7-10A, Block 26B, East Addition Subdivision, Anchorage Recording District to limited Right of Entry for Hazardous Substance Investigation. Todd Blessing
1/5/2010 Update or Other Action DEC recieved permission to enter upon Lot4, Block 26B East Addition for 2010 site investigation. Todd Blessing
8/2/2010 Site Characterization Report Approved DEC staff has reviewed Oasis Environmental's "Additional Site Characterization 4th and Gambell Anchorage, Alaska" , dated June 2010. In this report, Oasis documented the collection of air at four residences north of the 4th and Gambell site in February and May 2010. During each event, soil gas samples were collected adjacent to each residence from permanent soil gas monitoring points. Indoor air samples were collected at the two western residences, while crawl space air samples were collected at the two eastern residences. Outdoor air samples also were collected. Passive soil gas samples were collected over a two-week period from the end of April to early May. PCE was the only compound that regularly exceeded indoor air target levels and also was regularly detected in soil gas samples for the February and May sampling events. The following list shows by building when PCE exceeded indoor air target levels presumably as a result of vapor intrusion: • 710 E 3rd Ave – March and June 2009, February and May 2010 • 720 E 3rd Ave – March and June 2009, February and May 2010 • 736 E 3rd Ave (North Duplex) – March and June 2009, February and May 2010 • 736 E 3rd Ave (South Duplex) – March 2009, February and May 2010 The four rounds of sampling appear to indicate seasonal trends in PCE concentrations: • The indoor air concentrations are less in the spring than in the winter. Closed structures and increased heating demand are potential explanations for the increased winter concentrations. • The soil gas concentrations are greater in the spring than in the winter. Warmer soil temperatures likely are increasing vapor migration by yielding more volatilization and providing less resistance (i.e., no frozen soil to impede mobility). Passive soil gas sampling showed that elevated PCE concentrations occur around the former C&K Cleaners. The extent of the contamination approximately follows the arc of soil gas monitoring points SG-1, SG-2, SG-3, and SG-4. The elevated PCE concentrations represent the vadose-zone contamination. The passive soil gas data also appear to map a groundwater plume moving northeast from the source area and an area of increased PCE concentrations along the utility corridor in the alley. TCE was identified only in a small area near the former C&K Cleaners, which provides further evidence that PCE is the primary contaminant and that biodegradation is minimal. Todd Blessing
9/9/2010 Meeting or Teleconference Held DEC staff met with Ron Cupples who owns the buildings located at 736 East 3rd Avenue and Vicky Nickolich who owns the buildings located on 710 and 720 East 3rd Avenue, Anchorage, Alaska. DEC informed both landowners that the levels of PCE indoors has not diminished and that they should re-evaluate mitigation options ro reduce the unacceptable indoor air inhalation risks from vapor intrusion. Ron informed DEC that he has discussed the issue of vapor intrusion with the tenants of the duplexes on 736 East 3rd Avenue. He will also evaluate the installed mitigation systems to determine if they have been working. Vicky Nickolich requested drawings of subslab depressurization systems that could be installed in her two buildings and staff suggested she contact a contractor knowledgeble in this area. DEC informed both landowners that sampling of their buildings will likely not provide any additional useful information until they install mitigation systems that are affective at reducing indoor air concentrations of PCE. Todd Blessing
12/6/2010 Update or Other Action DEC and Oasis staff conducted an inspection of the vapor intrusion mitigation systems on two duplexes located northeast of the site on 3rd Avenue. The vapor intrusion mitigation systems were installed by Mark Cupples during the summer of 2009 after a request by DEC. The inspection was conducted on November 23, 2010. The inspection and subsequent report recommended that additional sealing of the north duplex crawl space membrane is needed. In addition, there is a foundation slab on the north duplex that is not being depressurized and consequently, may be a conduit for vapor intrusion through any existing cracks. The north duplex mitigation systems should be upgraded to treat this area. The inspection could not confirm that the south duplex mitigation system fan was operating; albeit, the membrane appeared to be sealed effectively. The inspection report was issued to Ron Cupples and DEC requested that Ron make improvements to the mitigation systems as noted in the report. In addition, DEC requested Ron or a qualified person conduct a vacuum test of both sytems after improvements have been completed to confirm the sysems are adequately depressurizing crawl space air and thus, reducing the levels of tetrachloroethylene vapors. Todd Blessing
4/19/2011 Site Characterization Workplan Approved DEC staff reviewed and approved Oasis’ “Site Characterization Work Plan, Alaska Real Estate Parking Lot, Anchorage, Alaska” Dated April 2011. Within the work plan, Oasis Environmental Inc. (Oasis) proposed to advance four soil borings on Block 26B, East Addition Subdivision, Anchorage, Alaska. During the soil boring advancement, two soil samples will be collected from each boring based on Color-Tec field screen readings to be analyzed for chlorinated alkenes with EPA method 8260b. Each soil boring will be eventually completed as a groundwater monitoring well and after development and purging, groundwater will be sampled for chlorinated alkenes by EPA method 8260B. Oasis also proposes to install 10 soil gas probes on the same properties. The soil gas probes will be installed next to the PIP Printing Building and the First Native Baptist Church. Once the probes are installed, they will be leak checked, purged, and then sampled for chlorinated alkenes utilizing EPA TO-15 method. Oasis will also conduct building surveys of the PIP Printing Building and the First Native Baptist Church in order to evaluate how the buildings construction will influence the vapor intrusion pathway. Todd Blessing
5/2/2011 Update or Other Action DEC reviewed a letter authored by Lawrence Albert, dated April 26, 2011. Mr. Albert notified DEC that Mrs. Ruth Mizelle has passed away in December 2010. The 4th and Gambell LLC has amended its operating agreement to authorize Mrs. Yvonne Anderson to be member manager and to succeed Mrs. Mizelle in that capacity. Todd Blessing
7/13/2011 Update or Other Action Staff recieved notification from Patrick Holmes that the Bloomfield Group plans on applying approximately 6 inches of crushed rock over the top of the existing layer of gravel on the parking lot. Staff notified Mr. Holmes that any movement of contaminated soil would require an approval from our Department and that our contractor will need access to the parking lot next year to conduct a remedial options feasibility study. Todd Blessing
8/17/2011 Update or Other Action Staff recieved a letter from Larry Albert requesting a copy of reports, work plans and ADEC correspondance dating back to November 2009. Todd Blessing
11/7/2011 Update or Other Action ADEC recieved a letter dated October 20, 2011 which was prepared by Larry Albert and addressed to Larry Dietrick. In the letter, Mr. Albert discussed the site background, ADEC's Administrative Actions, legal claims on property, ADEC's certificate of lien and due process considerations, LLC's liability under Alaska hazardous substance law, public nuisance law as an alternative to the LLC's statutory liability, apportionment of fault for response costs on the property, and proposal to toll limitations period on legal action pending completion of site investigation and remediation and accrual of response costs. Todd Blessing
12/14/2011 Update or Other Action John Treptow, senior assistant attorney general of the Alaska Department of Law issued a letter to Lawrence Albert on December 14, 2011. The letter was in response to Mr. Albert's October 20, 2011 letter to Larry Dietrick. Mr. Treptow discussed Fourth and Gambell LLC's: liability under Alaska law, ability to seek contribution from other potential liable parties, nonstatus as an innocent purchaser under Alaska law, statutory liability under public nuisance law, and liability for the entire amount of recovery costs. In addition, Mr. Treptow agreed to consider Mr. Albert's request for a tolling agreement. Todd Blessing
12/19/2011 Update or Other Action DEC staff issued a request for proposal to three DEC term contractors to further define the sources of contamination; evaluate the potential protectiveness, effectiveness, state and community acceptance, and cost of available cleanup options; and provide recommendations on a preferred cleanup approach. Todd Blessing
3/6/2012 Update or Other Action DEC staff reviewed Oasis' "Site Characterization Report", dated January 19, 2012. This report documented Oasis' site investigation on Lots 5, 6, and 10A of Block 26B. The investigation included advancing and sampling four soil borings that were completed as monitoring wells, and the installation and sampling (summer and winter) of nine soil gas points adjacent to the PIP Printing Building and First Native Baptist Church. No chlorinated alkenes were detected in soil samples collected from the soil borings. In groundwater samples, PCE was detected in monitoring well MW-8 (located on the northwest corner of the church) at a level of 0.00024 mg/L. Soil gas samples from four the soil gas points contained no detectable chlorinated alkenes. In three of the soil gas points, PCE was detected; however, not at levels that exceeded commercial soil gas target criteria. TCE was detected in one soil gas point during the winter sampling event at levels that did not exceed commercial soil gas target criteria. Todd Blessing
3/22/2012 Update or Other Action Exposure tracking model ranking updated. Todd Blessing
4/15/2013 Update or Other Action ADEC received the Fourth Avenue and Gambell Parking Lot Site Inspection Anchorage, Alaska Contract Number: EP-S7-06-02 Technical Direction Document Number: 12-01-0004 prepared by E&E dated February 2013. Three historic potential source areas were identified: wood/log cribs (which may still remain on site); four buried drums; and VOC contaminated soil. Electomagnetic and ground penetrating radar was utilized in efforts to locate the wooden cribs or buried drums. Anomalies were generally noted on the east half of the site 3 to 10 feet bgs. Soil, groundwater, sediment, and air samples were collected and analyzed for VOCs during the investigation. A total of 31 surface soil samples collected 0 to 2 feet bgs contained TCE up to 0.011 mg/kg and PCE up to 0.2 mg/kg. The total estimated surface soil contamination is 34,198 square feet. Thirteen boreholes - on and offsite - were advanced and completed as temporary monitoring wells. A total of 121 subsurface samples were collected to a depth of 50 feet bgs. PCE was detected in 38 of 60 on-site samples up to 56 mg/kg. BH05, 07, 08, and 09 had significant PCE contamination 10 to 40 feet bgs. Additionally BH07 contained PCE contamination 0 to 10 feet bgs and based off the GPR survey, is in the same location as the former buried drums. BH06 was the only bore hole that did not contain detectable levels of VOCs. PCE was also detected in 16 of 52 offsite samples up to 0.33 mg/kg. The offsite boreholes BH01 and BH02 had significant contamination 5 to 40 feet bgs and 10 to 35 feet bgs respectively. BH04 was the only borehole, which did not contain detectable levels of VOCs. The total estimated soil in the subsurface is 22,743 cubic yards. Twelve groundwater samples were collected from the temporary well points BH-01 to BH-12; BH-11 was not sampled due to a dry well. BH-12 contained a strong petroleum odor. PCE was detected in five of the six on-site water samples up to 1.6 mg/L. Additionally, 1,2-dichloropropane and methylcyclohexane were detected in BH03 at 0.0064 mg/L and 0.0098 mg/L, respectively. PCE was detected in offsite samples up to 8.5 mg/L and TCE was detected in one sample BH01GW at 0.006 mg/L. Ten sediment samples collected from Ship Creek did not contain detectable levels of VOCs. Summa canisters were used to collect eight outdoor air samples and 13 indoor air samples. Only one outdoor air sample from a summa canister located outside 50 feet north of 3rd Ave contained toluene at 11 ug/m3. Indoor air samples collected from the crawlspace of duplexes located at Block 26A: Lot 2 contained PCE concentrations up to 66 ug/m3 which is above the ADEC indoor air target level of 42 ug/m3. Ten Passive Gore Modules were also collected 18 to 22.5 inches bgs offsite. Six VOCs were detected. PCE was detected up to 14.01 ug/m3. Grant Lidren
8/22/2013 Meeting or Teleconference Held DEC held a meeting with the owner of the duplexes located on Block 26A:Lot 2 and the Department of Public Health(DPH). DEC discussed the current indoor air vapor intrusion risks to the tenants living at the site and planned FY13 state-lead site work, which includes mitigating the indoor air exposure pathway and collecting indoor air samples. The owner signed a Limited right of Entry for the FY13 work and said he would notify his tenants of current indoor air exposure risks. The DPH encouraged the duplex owner to have his tenants contact DPH if they have any questions regarding the current indoor air exposure risks. Grant Lidren
9/11/2013 Meeting or Teleconference Held ADEC attended a teleconference with EPA Region 10 to discuss future options for the Alaska Real Estate Parking Lot site which included potentially listing the site on the National Priority List (NPL); installing Vapor Intrusion(VI) systems in on-site residential structures to mitigate current indoor air exposure to PCE; sampling monitoring wells including those within the impacted “Groundwater 2/3” plume on the Anchorage Terminal Reserve property; and source removal and/or groundwater cleanup. Another meeting with EPA has been scheduled for September 26th. It was agreed that ADEC and EPA will further discuss Alaska Real Estate issues at that meeting. Grant Lidren
1/8/2014 Update or Other Action ADEC received the Final version of the Action Memorandum for the Fourth Avenue & Gambell Street Site submitted by EPA. The memorandum includes: a site history; identifies a passive vapor intrusion barrier system to mitigate vapors in the buildings; and a cost estimate. EPA will have their term contractor complete the work. ADEC will provide oversight of post-removal site control activities to ensure the protectiveness of the removal action. ADEC will also ensure that institutional controls are implemented to minimize the potential for human exposure to contamination. Field work is planned for May 2014 Grant Lidren
4/3/2014 Site Characterization Workplan Approved On this date, ADEC approved the Final Work Plan Focused Groundwater Characterization Alaska Real Estate Parking Lot submitted by Ahtna, dated April 3,2014. This State-lead CIP project includes: monitoring the on-site groundwater to determine contaminant trends; further define the down gradient extent of contamination; and select a preferable alternative for addressing groundwater contamination. Ahtna will begin field work mid to late April. Grant Lidren
5/1/2014 Site Visit On this date, ADEC performed a site visit at the Alaska Real Estate Parking Lot and an down gradient property adjacent to the railroad tracks Grant Lidren
5/13/2014 Site Visit On this date, ADEC accompanied Ahtna during GW sampling and EPA during VI mitigation field work Grant Lidren
6/16/2014 Update or Other Action Based off a 1957 Anchorage Phone Directory, A "New Method Cleaners" was listed for the address 715 4th Ave, which is the approximate location of the Alaska Real Estate Parking Lot. An adjacent landowner also verified "New Method Cleaners" occupied the space around 1955 until C&K cleaners operated there until 1969. Grant Lidren
9/9/2014 Site Characterization Report Approved EPA submitted the “Field Analytical Technical Memorandum Fourth Avenue and Gambell Parking Lot” on this date. The fieldwork consisted of installation of passive vapor intrusion mitigation (VI) systems on the four properties adjacent to the Alaska Real Estate Parking Lot. After the systems installation, indoor air samples were collected to confirm the mitigation of vapors. Indoor air samples collected from two of the four properties contained PCE above EPA indoor air screening levels. For these two residences (720 E 3rd Ave and 736 E 3rd Ave), EPA installed VI active mitigation systems. A second round of indoor air samples collected from these residences were below EPA screening levels. Grant Lidren
9/17/2014 Site Characterization Report Approved ADEC received the FINAL REPORT FOR FOCUSED GROUNDWATER CHARACTERIZATION ALASKA REAL ESTATE PARKING LOT ANCHORAGE, ALASKA ADEC SPAR TERM CONTRACT #18-8036-13 submitted by Ahtna dated September 16, 2014. The scope of work included installation of four new monitoring wells in the downgradient portion of the plume; decommissioning of four monitoring wells in the source area at the site; sampling 13 monitoring wells for PCE and daughter products, monitored natural attenuation (MNA) parameters, compound specific Isotope analysis (CSIA), and microbial tracing; and continual measurement of groundwater elevations in the downgradient area. The four monitoring wells: MW-1, MW-2, MW-3, and MW-4 were decommissioned. A total of 13 monitoring wells were sampled: nine historic wells and the four new monitoring wells 4GMW-12, 4GMW-13, 4GMW-14, and 4GMW-15. Groundwater samples collected from 4GMW-15 had a fuel odor, water samples collected form 4GMW-13 and 4GMW-14 contained a strong fuel odor, small droplets of fuel present, and a sheen. Additionally, soil cores collected from 4GMW-13 and 4GMW-14 contained petroleum impacts. PCE was detected only in monitoring wells MW-5, MW-6, MW-7, MW-8, and MW-28 from 0.00082 to 1.7 mg/L. TCE was detected only in down gradient monitoring wells 4GMW-15 at 0.00086 and MW-28 at 0.031 mg/L (note: the detection limit was elevated above cleanup levels to 0.0055 mg/L in MW-5, and MW-6). Cis-1,2,-DCE was detected only in down gradient monitoring wells 4GMW-14, 4GMW-15, MW-12S, MW-13, and MW-28 from 0.00025 to 0.31 mg/L. Trans-1,2-DCE was detected only in down gradient monitoring wells below method 2 cleanup levels in 4GMW-14, 4GMW-15, and MW-28. 1,1-DCE was not detected in any of the monitoring wells. VC was detected only in down gradient monitoring wells 4GMW-14, 4GMW-15, and MW-28 from 0.0096 to 0.041 mg/L. MW-6, located adjacent to the AK Real Estate parking lot on Block 26A Lot 3, contained the highest concentration of PCE. MW-28, located down gradient, contained the highest concentrations of: TCE; cis-1,2,-DCE; trans-1,2-DCE; and VC (note: these daughter products were only detected in the down gradient monitoring wells). MNA parameters collected indicate degradation is occurring at the downgradient extent of the plume. A Microbial analysis confirmed Dhc with the vcrA gene are present at downgradient monitoring well MW-28 with a detectable population and concentration of 1 *106 per L and 4 *105 per L respectively. DHC was not detected upgradient in monitoring well MW-5 and MW-6. The compound specific Isotope analysis of chlorine and carbon was measured in PCE only. The isotopic signatures in the upgradient monitoring wells MW-5 and MW-6 were “heavier” than the PCE in the down gradient monitoring well MW-28 which were “lighter”. Groundwater flow from source area is to the northeast past 3rd avenue to north along Ingra Street to 1st avenue. From there, groundwater flows northwest then west along the railroad tracks. A potential groundwater seep, evident by surface water, was observed south of 4GMW-14. Grant Lidren
11/12/2014 Site Characterization Report Approved On this date, ADEC received the “FINAL FOCUSED FEASIBILITY STUDY FOR GROUNDWATER ALASKA REAL ESTATE PARKING LOT…” submitted by Ahtna, dated November 11, 2014. This Focused FS for groundwater presents a summary of the historical analytical results for the site, a discussion of the nature and extent of soil and groundwater contamination, and five remedial alternatives for addressing groundwater contamination. The five alternatives for groundwater include: Alternative GW-1, No Action; Alternative GW-2, Monitored Natural Attenuation (MNA); Alternative GW-3, In-Situ Chemical Oxidation (ISCO); Alternative GW-4, Enhanced Reductive Dechlorination (ERD); and Alternative GW-5, Permeable Reactive Barrier. Based off a comparison of the alternatives, ISCO and ERD are the preferred alternatives. Grant Lidren
12/5/2014 Meeting or Teleconference Held On this date, ADEC conducted a teleconference with EPA Region 10 to discuss future options for the Alaska Real Estate Parking Lot site to discuss 2014 and future work at the site. Based off the 2014 work, ADEC plans futher indoor air and groundwater sampling. The intent of future work is to verify the mitigation systems in the four buildings is sufficiently controlling exposure to vapors and delineate the extent of the groundwater plume to protect human health and the environment. Grant Lidren
1/26/2015 Report or Workplan Review - Other On this date, ADEC received the Final Removal Action Report for Subarea II of the Fourth Avenue and Gambell Street Site submitted by Ahtna, dated January 13, 2015. The work involved installing vapor intrusion mitigation systems in these four down gradient buildings: 710 E 3rd, 720 E 3rd, 736 E 3rd N duplex, and 736 E 3rd S duplex. All of the buildings had sub-membrane and sub-slab depressurization passive systems installed due the crawlspaces containing both concrete floors and dirt floors except the 736 E 3rd S duplex building. This building has a dirt floor, therefore only a passive sub-membrane depressurization system was installed. After install, post indoor air samples were either collected from the crawlspace or basement in centrally located areas. Indoor air samples collected 5/28/14 from 710 E 3rd and 736 E 3rd S duplex were below the ADEC residential PCE target level of 42 ug/m3 for indoor air. However, indoor air samples collected from 720 E 3rd and 736 E 3rd N duplex contained PCE at 66 ug/m3 and 78 ug/m3 respectively. Based off this data, electric fans were installed in the sub-membrane and sub-slab depressurization systems at 720 E 3rd and 736 E 3rd N duplex making them active. Post indoor air samples collected 10/27/14 from buildings 720 E 3rd and 736 E 3rd N duplex contained PCE below ADEC target levels for indoor air. Grant Lidren
1/26/2015 Report or Workplan Review - Other On this date, ADEC received the Fourth and Gambell Site Vapor Mitigation Systems Monitoring, Maintenance, and Repair Plans for 710 E 3rd, 720 E 3rd, 736 E 3rd N duplex, and 736 E 3rd S duplex: submitted by Ahtna and Rescon, dated January 13, 2015. The plan recommends: quarterly inspections, biannual maintenance, care measures, and biennial indoor air sampling for the four buildings. Grant Lidren
5/13/2015 Update or Other Action On this date, ADEC recorded two Notices of Environmental Contamination (NECs) on the properties located on 710 and 720 East 3rd Avenue. the NECs are to provide information concerning indoor air contamination affecting the real properties located at 710 and 720 E. 3rd Avenue. This notice also provides a list of maintenance, monitoring, and repair activities that the United States Environmental Protection Agency (“EPA”) recommends the property owner to perform. These activities will assist in keeping tetrachlorothene (“PCE”) vapor concentrations below the ADEC PCE target level for residential indoor air, thereby protecting public health and the environment. Grant Lidren
6/10/2015 Update or Other Action On this date, Ronald Cupples recorded two Notices of Environmental Contamination (NECs) on the north and south duplexes located at 736 E 3rd Avenue. The NECs are to provide information concerning indoor air contamination affecting the real properties located 736 E 3rd Avenue. This notice also provides a list of maintenance, monitoring, and repair activities that the United States Environmental Protection Agency (“EPA”) recommends the property owner to perform. These activities will assist in keeping tetrachlorothene (“PCE”) vapor concentrations below the ADEC PCE target level for residential indoor air, thereby protecting public health and the environment. Grant Lidren
7/15/2015 Site Characterization Report Approved On this date, ADEC reviewed the Focused Groundwater Characterization, Alaska Real Estate Parking Lot, Anchorage Alaska submitted by Ahtna, dated June 23, 2015. This memo documented additional characterization activities to accompany the FINAL REPORT FOR FOCUSED GROUNDWATER CHARACTERIZATION ALASKA REAL ESTATE PARKING LOT ANCHORAGE, ALASKA ADEC SPAR TERM CONTRACT #18-8036-13 submitted by Ahtna dated September 16, 2014. Work included: acquiring historical photos; retrieving datalogger data from May 2014 to April 2015; and sampling the groundwater from down gradient monitoring wells. The down gradient monitoring wells located adjacent to 1st avenue including: AKRRMW-22; AKRRMW-24S; and MW-B-3 which were sampled for VOCs and 4GMW-13; 4GMW-14; 4GMW-15; and MW-28 which were sampled for GRO, DRO, and BTEX. Only monitoring wells 4GMW-13 and 4GMW-14 - located at the location of the historic 1964 AST rupture (see contaminated site file# 2100.38.326 Municipal Light & Power – Power Plant 1 for more info)- contained contamination above cleanup levels with DRO at 1.6 mg/L and 2.1 mg/L respectively. Groundwater flow was to the northwest and based off data logger data has a hydrological connection to Ship Creek. Grant Lidren
4/8/2016 Update or Other Action On this date, ADEC decommissioned a damaged soil gas monitoring point located south of the First Native Baptist Church. Grant Lidren
3/6/2017 Site Characterization Workplan Approved Ahtna submitted the Final Work Plan Groundwater and Indoor air Evaluation Alaska Real Estate Parking Lot ADEC SPAR Term Contract #18-8036-13 dated March 6, 2017. Work to be completed includes: periodically checking on established vapor intrusion mitigation systems to ensure they are working properly, collect indoor air samples, and monitor area-wide groundwater including the down gradient site: ARRC Anchorage Terminal Reserve Ground Water Areas 2/3 and 4 (2100.38.447). Grant Lidren
3/16/2017 Update or Other Action On this date, indoor air samples were collected from the north and south duplexes located at 736 E 3rd. The north duplex contained a PCE soil gas concentration of 7.8 ug/m^3. The south duplex contained a PCE soil gas concentration of 4.3 ug/m^3. Both of these concentrations are below the PCE ADEC target level for residential indoor air of 41 ug/m^3. Note: the uninhabited boarded up buildings located at 710 and 720 E 3rd were not sampled. Grant Lidren
5/22/2017 Update or Other Action A seep surface water sample collected in May at the base of the bluff down near 1st Ave contained PCE at 120 ug/l. The ADEC Table C GW cleanup level for PCE is 41 ug/l. The seep daylights into a mini crick that feeds into two pools of water but then seeps back into the ground. These pools are fairly decent size and fairly audible. There is no clear connection to Ship Creek. Reportedly, the seep is seasonal and dissipates toward late summer. The seep pools are located on MOA property behind a fence. Grant Lidren
6/8/2017 Update or Other Action ADEC reviewed and approved the "SOIL MANAGEMENT PLAN: 3/4 ALLEY PROJECT (UNDERGROUND UTILITY INSTALLATON: 3rd and 4th AVENUE ALLEY, HYDER TO EAGLE SREET" prepared for ML&P and submitted by SLR. Grant Lidren
10/24/2017 Site Characterization Report Approved ADEC received the Groundwater Evaluation Interim Report Alaska Real Estate Parking Lot, Anchorage, Alaska Notice-to-Proceed Number 17000735 dated October 23, 2017 submitted by Ahtna. Twenty-five MWs were scheduled for sampling but only 13 MWs were sampled. The other monitoring wells were not located and may no longer be present. Only five of the thirteen monitoring wells sampled contained contaminant concentration above ADEC cleanup levels. Only source area monitoring wells MW-5 and MW-6 contained contaminant concentrations above cleanup levels with PCE up to 140 ug/L and 1,200 ug/L respectively. Downgradient monitoring wells 4GMW-15, 4GMW-14, and 4GMW-13 contained contaminant concentrations above cleanup levels with cis 1,2-DCE up to 93 ug/L, VC up to 9.4 ug/L, naphthalene up to 8.7 ug/L, and 1,2,4-TMB up to 96 ug/L. Additionally, a surface water sample from a groundwater seep contained PCE up to 120 ug/L which is above ADEC groundwater cleanup levels and 18 AAC 70 WQS. Grant Lidren

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