p-ac16-05b - Minnesota Pollution Control Agency

p-ac16-05b - Minnesota Pollution Control Agency

DEPARTMENT: SF-00006-05 (4/86) POLLUTION CONTROL AGENCY STATE OF MINNESOTA Office Memorandum  DATE: TO: FROM: PHONE: MEETING DATE: SUBJECT May ...

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DEPARTMENT:

SF-00006-05 (4/86)

POLLUTION CONTROL AGENCY

STATE OF MINNESOTA

Office Memorandum  DATE: TO: FROM:

PHONE:

MEETING DATE: SUBJECT

May 12, 2016    MPCA Advisory Committee Members                         Kathy Sather         Division Director         Remediation Division      651‐757‐2691             May 24, 2016    MPCA Superfund Program Update to the Permanent List of Priorities 

      I.

Status  The Minnesota Pollution Control Agency (MPCA) is authorized to take any removal or remedial (cleanup)  action necessary to protect the public health, welfare or the environment whenever there is a release, or  substantial threat of release, from a facility of any pollutant, contaminant, or hazardous substance that  presents an imminent and substantial danger to the public health, welfare, or the environment. The law  requires the MPCA to adopt the State Superfund Permanent List of Priorities (PLP) and to update the list  annually. MPCA proposes sites to be added to the State Superfund PLP so necessary enforcement actions or  State resources can be used to complete additional investigation or cleanup necessary to address risks from  the release of hazardous materials, and to allow for public engagement.  State Superfund resources are used  if no viable responsible parties can be identified. Responsible parties are also liable for prior costs incurred  by the State in responding to such releases of hazardous substances. Before any update of the PLP is  adopted by the MPCA, we must publish the proposed update in the State Register and provide a 30‐day  public comment period. The MPCA published notice of its intent to update the PLP in the May 9, 2016,  edition of the State Register. As of the May 24, 2016 meeting date, there will be 15 days remaining for public  comment on these updates. 

II.

Background  The MPCA is proposing to add ten sites (Sites) and remove one site from the State Superfund PLP. Sites  being added to the list are current or former dry cleaners, metal platers or other industries that use  industrial chemical solvents, including trichloroethylene (TCE), and perchloroethylene (PCE, or perc) in their  business processes. When these chemicals are spilled or otherwise migrate into soil or groundwater, the  resulting contamination can spread outward through groundwater or upward as vapors into residential or  commercial basements and foundations.    The ten sites proposed to be added to the list include the following:     1. D’s Fabric Care, Cloquet, is a dry cleaning operation that is being investigated for groundwater and  soil vapor contamination.  2. West 66th Street and Vincent Avenue, Richfield, was the site of small spills or disposal of the dry  cleaning chemical PCE that contaminated groundwater.  3. Hospital Linen, St. Paul, is a former commercial laundry and industrial dry cleaning site where PCE  was found in soil and soil vapor;  4. South East Hennepin Area Groundwater and Vapor Site, Minneapolis, is a TCE‐contaminated  site that has ongoing groundwater monitoring and soil vapor testing; 

 

p-ac16-05b · 5/4/16

5. Lyndale Avenue Corridor, Bloomington, is home to more than 40 commercial and industrial  businesses, including vehicle repair, dry cleaning and manufacturing, that have or currently use  hazardous chemicals which contaminated soil and groundwater;  6. Arcade Street North and Hawthorne Avenue East, St Paul, is the site of a former dry cleaner and  auto service station where industrial solvents have been found in groundwater and soil;  7. 55th Street and Lyndale Avenue South, Minneapolis, is the site of a former dry cleaning operation;  the MPCA is investigating a PCE release which has contaminated groundwater and soil vapor;  8. Universal Plating, Minneapolis, was a chemical and mechanical plating facility that closed in  2009 and has been included in the MPCA’s Voluntary Investigation and Cleanup program since 2014;  9. Former Pure Oil Bulk Storage Facility, Excelsior, where industrial solvents PCE and TCE were  detected in groundwater and soil vapors, from an unknown source;  10. University Avenue and Pascal Street Area, St Paul, is an area that has had TCE and PCE detected in  soil and groundwater.    The one site proposed for delisting is Boyer Lumber Superfund site in Virginia, Minnesota. This site was an  undeveloped mining property that later became a manufacturing facility and later a lumber yard and  hardware store. Investigation at the Boyer Lumber Site identified volatile organic compounds (VOCs),  polycyclic aromatic hydrocarbons (PAHs), pentachlorophenol (PCP), and dioxins in soil and VOCs, PAHs and  PCPs in groundwater. Contaminated soils were removed to a landfill and backfill material was brought in  from a clean, off‐site source. Groundwater impacts were only found on the site property and were not  identified beyond the property boundaries. The MPCA has determined that the site cleanup is protective of  public health and welfare and the environment. Therefore, legal conditions for removing the site from the  PLP have been met by Boyer Lumber and no additional actions are necessary. MPCA staff recommends that  the Boyer Lumber site be removed from the State Superfund PLP.    Additional information about each of these sites and rationale for listing and delisting can be found in the  site summaries on the MPCA Superfund Program web page https://www.pca.state.mn.us/waste/superfund‐ program.    III.

CB:rm 

Issues  A. Is there additional information the Commissioner should consider at any or all of these sites?  B. Is there additional or different information relevant to these listings that the MPCA might share with  the community?  C. Are there concerns you believe the public may have with these listings or this cleanup work?   

SF-00006-05(4/86)

DEPARTMENT :

STATE OF MINNESOTA

POLLUTION CONTROL AGENCY

Office Memorandum DATE : TO :

FROM :

PHONE : SUBJECT :

May 2, 2016    John Linc Stine  Commissioner    Kathy Sather  Division Director  Remediation Division    651‐757‐2691    State Register Notice for Update of State Superfund Priority List  

Attached is the State Register Notice and printing order for the next update of the State Superfund Priority  List or Permanent List of Priorities (PLP). In this update, the Minnesota Pollution Control Agency (MPCA) is  proposing to add ten and remove one site from the PLP.  The ten additions to the PLP are:    1) D’s Fabric Care, Cloquet MN  2) West 66th and Vincent Avenue, Richfield MN   3) Hospital Linen, St. Paul MN  4) Southeast Hennepin Avenue Area‐Wide Groundwater and Vapor Plume, Hennepin County  5) Lyndale Avenue Corridor, Bloomington MN   6) Arcade Street and Hawthorne Avenue, St. Paul MN  7) 55th Street and Lyndale Avenue South, Minneapolis MN  8) University Avenue and Pascal Street Site, St. Paul MN  9) Pure Oil Bulk Storage Facility, Excelsior MN  10) Universal Plating Facility, Minneapolis MN    The MPCA recommends removing the Boyer Lumber Site located in Virginia MN from the PLP.      Included is a staff memorandum for each proposed site addition, outlining the rational for each respective  addition and deletion from the PLP.    Under current state rules, the MPCA is required to update the PLP at least annually. Notices of these updates  are required to be published in the State Register, and allow for a 30 day public comment period. This MPCA  update is planned for publication in the State Register on May 10, 2016. This will allow the 30 day comment  period to extend two weeks past the May 24th MPCA Citizen’s Advisory Committee meeting.  MPCA staff also  sends out copies of the State Register Notice to affected or interested parties regarding each site, and will  issue a news release concerning the update. MPCA staff have also been in contact with local government and  elected officials in the communities listed above.  Following closure of the comment period, MPCA staff will  respond to any comments submitted and make final recommendations as to the listing of sites to the PLP.      Please sign the State Register printing order form and return to Tom Higgins of my staff.        KS:csa    TDD (for hearing and speech impaired only): (612)282-5332 Printed on recycled paper containing at least 10% fibers from paper recycled by consumers

Attachment Cc: Sandeep Burman, Remediation Division Crague Biglow, Superfund Section Tom Higgins, Superfund Section Jennifer Jevnesik, Superfund Section Greg Small, Superfund Section Al Timm, Superfund Section Fred Campbell, Superfund Section Mark Ostby, Superfund Section Rick Jolly, Superfund Section Chris Formby, Superfund Section Wayne Sarappo, Superfund Section Carmen Netten, Legal Services

Minnesota Pollution Control Agency Remediation Division

Notice of Proposed Update of the State Superfund Priority List (State Superfund List) (also known as the Permanent List of Priorities (PLP)) Among Releases or Threatened Releases of Hazardous Substances or Pollutants or Contaminants. NOTICE IS HEREBY GIVEN that the Minnesota Pollution Control Agency (MPCA) is publishing for public comment proposed additions to the State Superfund List which lists releases or threatened releases of hazardous substances, pollutants, or contaminants for which the MPCA may take removal or remedial actions under the Minnesota Environmental Response and Liability Act (MERLA), Minn. Stat. §§ 115B.01115B.20. Pursuant to Minn. Stat. § 115B.17, the MPCA is authorized to take any removal or remedial action which the MPCA deems necessary to protect the public health, welfare or the environment whenever there is a release, or substantial threat of release, from a facility of any pollutant or contaminant which presents an imminent and substantial danger to the public health, welfare, or the environment, or whenever a hazardous substance is released or there is a threatened release of a hazardous substance from a facility. Minn. Stat. § 115B.17, subd. 13 required the MPCA to establish priority rules regarding releases or threatened releases of hazardous substances, and pollutants or contaminants. These rules, Minn. R. ch. 7044, became effective on April 5, 1993. Minn. Stat. § 115B.17, subd. 13 also require the MPCA to adopt the State Superfund List and to update the list annually according to the criteria set forth in the priority rules. Before any update of the State Superfund List is adopted by the MPCA, it must be published in the State Register and a 30-day public comment period must be provided. This notice is, therefore, published to inform the public that the MPCA is proposing to update the State Superfund List and to solicit public comment on the proposed additions. Pursuant to Minn. Stat. § 115B.17 and Minn. R. 7044.0950, the MPCA is proposing the following changes to the Superfund List.

The MPCA is proposing to add the following ten sites (Sites) to the State Superfund List (Hazard Ranking Score assigned pursuant to Minn. R. 7044.0350 follows the Site): 1) D’s Fabric Care, Carlton County (5.81); 2) West 66th Street and Vincent Avenue, Hennepin County (50.19); 3) Hospital Linen, Ramsey County (50.19); 4) South East Hennepin Area Groundwater and Vapor Site, Hennepin County (33.91) 5); Lyndale Avenue Corridor, Hennepin County (38.93); 6) Arcade Street North and Hawthorne Avenue East, Ramsey County (24.62); 7) 55th Street and Lyndale Avenue South, Hennepin County (17.38); 8) Universal Plating, Hennepin County (25.09); 9) Former Pure Oil Bulk Storage Facility, Hennepin County (7.13); 10) University Avenue and Pascal Street Area, Ramsey County (18.43). These MPCA sites are being proposed for addition to the State Superfund List as in each case, State Superfund resources will likely be necessary to complete appropriate response actions. Each MPCA Site has been assigned to Response Action Classes C and D (see Minn. R. 7044.0450). The four response action classes are defined as follows: Class A - Declared Emergency; Class B - Response Actions Completed and Operation and Maintenance/Long-Term Monitoring Ongoing; Class C - Response Actions Necessary or in Progress or First Year Operation and Maintenance at a Site; and Class D - Remedial Investigations and Feasibility Studies Necessary or in Progress. The MPCA is also proposing to delist the following Site from the Superfund List: Boyer Lumber Superfund Site, Virginia, St. Louis County. The 2.75 acre site was listed on the Permanent List of Priorities (PLP) February 25th, 2014. Several investigations were completed by various MPCA programs between 1990-2013 at the Boyer Lumber Site which identified volatile organic compounds (VOC’s), polycyclic aromatic hydrocarbons (PAH’s), pentachlorophenol (PCP), and dioxins in soil and VOC’s, PAH’s and PCP’s in groundwater. In most cases, contaminated soils were removed to a landfill and backfill material was brought in from a clean, off-site sources. Groundwater impacts were only found on the site property and were not identified offsite during investigation activities. The impacted groundwater was also found to be stable and not moving offsite. The site investigations determined there was a low risk to human health associated with the contaminated

groundwater from the Boyer Lumber site. The lack of nearby water supply wells near the site along with the limited size and mobility of the groundwater contamination support this determination. The Minnesota Decision Document (MDD) as amended March 31st, 2016 documents that the MPCA has determined the selected response actions are protective of public health and welfare and the environment. MPCA staff recommends that the Boyer Lumber site be removed from the PLP because Boyer Lumber has taken all reasonable and appropriate actions related to the identified releases. The PLP deletion criteria have been met by Boyer Lumber for the site and no further Minnesota Environmental Response and Liability Act (MERLA) response actions are necessary there. In addition, no further MERLAfunded response actions are necessary because there is no longer a threat to human health or the environment under the current land use. The MPCA invites members of the public to submit written comments on the proposed ten additions and one deletion from the State Superfund Permanent List of Priorities. All written comments with regard to these proposed changes to the Superfund List must be received no later than 4:30 p.m. on June 10th, 2016. Written comments regarding the proposed updates to the State PLP should be submitted to: Tom Higgins, Site Remediation and Redevelopment Section, Remediation Division, Minnesota Pollution Control Agency, 520 Lafayette Road North, St. Paul, Minnesota 55155-4194. There will also be a public meeting of the MPCA Advisory Committee on Tuesday May 24th, 2016 at which time the proposed listings and delisting described in this document will be discussed. Additional information will also be posted about each site on the MPCA website. All written comments received by the above deadline will be considered by the MPCA in establishing the updated State Superfund List.

John Linc Stine, Commissioner Minnesota Pollution Control Agency

MPCA proposes to add ten, delete one of state’s contaminated sites on Minnesota Superfund list

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MPCA proposes to add ten, delete one of state’s contaminated sites on Minnesota Superfund list Minnesota Pollution Control Agency sent this bulletin at 05/09/2016 10:29 AM CDT

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For release: May 9, 2016 Contact: Anne Moore, 218-302-6605

MPCA proposes to add ten, delete one of state’s contaminated sites on Minnesota Superfund list St. Paul, Minn. --The Minnesota Pollution Control Agency (MPCA) is proposing to delete one from, and add 10 contaminated sites to, the state’s Superfund Permanent List of Priorities. These sites have known risks to

human health and the environment, or the potential to pose these risks.  The public is invited to comment on the proposed sites’ additions and deletion by June 10, 2016. MPCA Remediation Division staff will make a presentation about the proposed list changes to the MPCA Advisory Committee on May 24 in St. Paul. This meeting will be open to the public; however, formal comments about the proposal must be made to the designated staff contact described below. Nine of the 10 sites are located in the Twin Cities metro area and the remaining site is in Cloquet, Minnesota.   Sites being added to the list are current or former dry cleaners, metal platers or other industries that use industrial chemical solvents, including trichloroethylene (TCE), and perchloroethylene (PCE, or perc) in their business processes. When these chemicals are spilled or otherwise migrate into soil or groundwater beneath the establishment, the resulting contamination can spread outward through groundwater or upward as vapors into residential or commercial basements and foundations. The Metro-area sites being proposed for addition are: 55th Street and Lyndale Avenue South, Minneapolis, is the site of a former dry cleaning operation; the MPCA is investigating a PCE release which has contaminated groundwater and soil vapor; Arcade and Hawthorne, St Paul, is the site of a former dry cleaner and auto service station where industrial solvents have been found in groundwater and soil; Hospital Linen, St Paul, is a former commercial laundry and industrial dry cleaning site where PCE was found in soil and soil vapor;

https://content.govdelivery.com/accounts/MNPCA/bulletins/1480dcb[5/10/2016 4:07:23 PM]



MPCA proposes to add ten, delete one of state’s contaminated sites on Minnesota Superfund list Lyndale Avenue Corridor, Bloomington, is home to more than 40 commercial and industrial businesses, including vehicle repair, dry cleaning and manufacturing, that have or currently use hazardous chemicals which contaminated soil and groundwater; Pure Oil Bulk Storage Facility, Excelsior, where industrial  solvents PCE and TCE were detected in

groundwater and soil vapors, from an unknown source; Southeast Hennepin Area Ground Water and Vapor Plume, Hennepin County, is a TCE-contaminated site that has ongoing groundwater monitoring and soil vapor testing; Universal Plating Facility, Minneapolis, was a chemical and mechanical plating facility that closed in 2009 and has been included in the MPCA’s Voluntary Investigation and Cleanup program since 2014; University Avenue and Pascal Street, St Paul, is an area that has had TCE and PCE detected in soil and groundwater; and, West 66th Street and Vincent Avenue, Richfield, was the site of small spills or disposal of the dry cleaning chemical PCE that contaminated groundwater. The Cloquet-based site being proposed for addition is the former D’s Fabric Care, which was a dry cleaning operation that is being investigated for groundwater and soil vapor contamination. The one site proposed for delisting is Boyer Lumber Superfund site in Virginia, Minn. This site was an undeveloped mining property that later became a manufacturing facility and later a lumber yard and hardware

store. Based on MPCA hazardous materials cleanup actions, no further work is necessary at this site to protect public health and the environment. Online access to all sites being added or taken off the list is available here. Placement on the PLP list makes funding available to investigate and clean up these sites. The last time the agency added or deleted a site from this list was in September 2015. Comments about the proposed site additions and deletion may be made by 4:30 p.m. on June 10, 2016 to Tom Higgins, MPCA Site Remediation and Redevelopment Section, at (651) 757-2436 , (800) 657-3864 or

[email protected] For more information about the state’s Superfund program, visit https://www.pca.state.mn.us/waste/superfundprogram. Broadcast version The Minnesota Pollution Control Agency is proposing to add ten contaminated sites to the state’s Superfund list.  All but one is in the Twin Cities metro area; the other is in Cloquet, Minnesota. Sites added to this list become eligible for funding which allows the agency to investigate and clean up these sites. One site in Virginia, Minnesota is proposed for delisting, meaning the site has been cleaned up and no longer qualifies as a Superfund site. The agency’s Remediation Division staff will make a presentation about the proposed list changes to the MPCA Advisory Committee on May 24 in St. Paul. This meeting will be open to the public; however, comments about the proposal must be made in writing by June 10. To learn more about these sites or to comment about the M-P-C-A’s proposal, visit the M-P-C-A web site. ### The mission of the MPCA is to protect and improve the environment and enhance human health. St. Paul • Brainerd • Detroit Lakes • Duluth • Mankato • Marshall • Rochester • Willmar www.pca.state.mn.us • Toll-free and TDD 800-657-3864  

https://content.govdelivery.com/accounts/MNPCA/bulletins/1480dcb[5/10/2016 4:07:23 PM]

DEPARTMENT:

DATE: TO:

FROM:

POLLUTION CONTROL AGENCY 5/2/16

SF-00006-05 (4/86)

STATE OF MINNESOTA

Office Memorandum

Sandeep Burman Manager Site Remediation and Redevelopment Remediation Division

Crague Biglow Supervisor Site Remediation and Redevelopment Section Remediation Division Jennifer Jevnisek Site Remediation Unit 2 Site Remediation and Redevelopment Section Remediation Division

PHONE: SUBJECT:

651-757-2181 Permanent List of Priorities Listing Request D’s Fabric Care, 12 Second Street, Cloquet (SR264)

Minnesota Pollution Control Agency (MPCA) staff recommends listing the D’s Fabric Care property, located at 12 Second Street in Cloquet (the Site) on the Minnesota Permanent List of Priorities (PLP). This will allow state funds to be used to conduct investigation activities and response actions. This Site was previously referred to the MPCA Superfund program based upon the findings from the MPCA Site Assessment program investigations of the site (SA4521) conducted in 2012. Between 2014 and 2015, MPCA Superfund program staff provided several opportunities for the owner of the Site to voluntarily address investigation and response activities; the offers were declined. Background The D’s Fabric Care Site (Figure 1) was referred to the MPCA Site Assessment Program when perchloroethylene (PCE) was detected in groundwater samples collected during a petroleum leak site investigation at the adjoining Frank Lloyd Wright (FLW) designed gas station (Leak ID 6780). PCE is commonly used as a dry cleaning solvent. The D’s Fabric Care property was identified as the possible source of the PCE release due to its upgradient location, and because of its past use as a laundry and dry cleaning service from 1966 to at least 1995. The D’s Fabric Care property is currently occupied by Cloquet Laundromat. An investigation conducted by the MPCA Site Assessment program in 2012 confirmed that high concentrations of PCE vapors are present under the D’s Fabric Care building (the highest concentration was 1,070,000 micrograms per cubic meter, µg/m3), and that the PCE release appears to originate from beneath this building near the former dry cleaning machinery. PCE soil vapor concentrations are depicted on Figure 2, which also denotes the extent of the investigation.

PCE is also present in shallow groundwater beneath the site and has been detected in water discharging from an on-site basement sump. Potential risks associated with this release include chlorinated solvent vapor intrusion into buildings (including the site, the adjoining FLW designed service station building (currently operated by Best Oil Inc.), and nearby residences), the discharge of contaminated sump water to the municipal sanitary sewer system, and potential migration of contaminated groundwater to off-site receptors (including the St. Louis River located about 1000 feet to the north). Based on the significant risks to human health and the environment identified, the MPCA Site Assessment Program has referred this Site to our State Superfund program for oversight of further investigation and response actions. MPCA Investigation Activity The MPCA Site Assessment Program initiated investigation of the Site in April 2012 through the hiring of a multi-site contractor to conduct a limited site investigation which consisted of a limited historical file review, potential source investigation, and field activities (collection of soil, groundwater, and soil-gas samples). Eight soil probes/temporary monitoring wells were advanced, two sub-slab points were installed in the former D’s Fabric Care building, and five temporary soil gas borings were advanced. The historical review confirmed the site was occupied by a dry cleaning business from 1966 to 1995. Subsurface soil contamination was detected in a boring north of the adjoining service station, and the detection of PCE was attributed to contaminated groundwater migrating from the source area. The highest concentration of PCE in groundwater (84.1µg/L) was detected in a sump water sample collected from the basement of the D’s building. PCE concentrations were noted to be above the Class 2B Chronic Standard but below the Maximum Standard for surface water. Groundwater samples collected throughout the site had PCE detections exceeding the Minnesota Department of Health (MDH) established health risk limit (HRL) for drinking water. PCE concentrations in groundwater ranged from non-detect to 84.1 µg/L. Sub-slab samples from the D’s building exceeded 10 times the industrial intrusion screening value (ISV) of 30 µg/m3 for PCE. Soil-gas samples collected throughout the property noted the presence of PCE at concentrations exceeding the current residential ISV of 2 µg/m3; concentrations of PCE ranged from 3.4 to 92.4 µg/m3. Additional investigation activities conducted between May and June 2012 focused on indoor air sampling in both the D’s building and adjoining service station, and sub-slab sampling in the D’s building. Results of this assessment identified PCE sub-slab concentrations exceeding the 10X industrial ISV in the D’s building, and PCE indoor air concentrations in both the D’s and adjoining service station that exceeded the current industrial ISV. To date, the full extent and magnitude of soil, groundwater, and soil-vapor contamination has not been identified. Mitigation of Imminent Threat After reviewing the available data and revised ISV standards (ISVs were changed in 2014), MDH issued an expedited action determination for the site to evaluate immediate vapor intrusion risk to on-site building occupants and nearby residences. MPCA is currently working with the owners of the D’s and FLW buildings to install active mitigation systems. MPCA has also retained a multi-site contractor to

install sub-slab vapor points in seven nearby residences, and evaluate if soil-vapor intrusion is occurring at these properties. MPCA was informed by the city of Cloquet that sump discharge to the sanitary system is not allowed under city code. The matter has been referred to the Western Lake States Sanitary District (WLSSD) for regulatory oversight. Human Health Risks The presence of elevated levels of PCE in the soil gas in the vicinity of the D’s Fabric Care site constitutes a significant health risk. PCE has been detected in soil gas at levels more than 35,000 times the regulatory values for commercial properties in this area. Not only is this a potential soil vapor intrusion risk to the on-site buildings, but also to those who may need to excavate soil or work in areas below grade. The extent of on-site soil vapor contamination has not yet been fully determined, nor has the extent of soil vapor contamination to off-site receptors been defined. The risk of direct soil or groundwater exposure is not known because the extent and magnitude of soil and groundwater contamination is not known at this time. Conclusion Site investigation work has demonstrated the presence of elevated concentrations of PCE in the soil gas at the Site. Groundwater and soil vapor concentrations from samples collected at the Site indicate that PCE is present in groundwater and soil vapors at concentrations of regulatory concern. Additional investigation is necessary to determine the extent and magnitude of the release(s) and the source area(s). Soil vapor concentrations of PCE are high enough to warrant installation of vapor intrusion mitigation systems at the on-site buildings to mitigate the exposure potential. Additional sub-slab vapor sampling and mitigation work is needed to address potential vapor intrusion risks to off-site receptors. The D’s Fabric Care Site should be listed to the State PLP to perform additional investigation to determine the potential risks to receptors associated with the identified release and to determine any corrective actions, if necessary.

Figure 1: D's Fabric Care SR264

4/25/2016

Site Location

´

0

2,500

5,000

10,000 Feet

Figure 2: D's Fabric Care SR264 0

30

60

Cloquet Ave

4/25/2016

120 Feet

Cloquet Ave

3rd St

Frank Lloyd Wright Designed Gas Station (Best Oil)

D's Fabric Care (Cloquet Laundromat)

8.8 !. 92.4 !.

¬ « 33

3.4 !.

1,070,000 !. 4,020 !.

83.2 !.

30.8 !.

PCE Soil Vapor Values ug/m3=micrograms per cubic meter High : 1,070,000 ug/m3 Low : 3.4 ug/m3 (Residential Screening Value: 2 ug/m3) Historic Vapor Sampling Point

´

.!

Sampling Point & Concentration (ug/m3). These points are the extent of investigation activities.

DEPARTMENT:

DATE:

POLLUTION CONTROL AGENCY 5/2/2016

TO:

Sandeep Burman Manager Site Remediation and Redevelopment Section Remediation Division

FROM:

Crague Biglow Supervisor Site Remediation and Redevelopment Section Remediation Division

SF-00006-05 (4/86)

STATE OF MINNESOTA

Office Memorandum

Gregory Small Site Assessment Program Site Remediation and Redevelopment Section Remediation Division PHONE: SUBJECT:

651-757-2304 Permanent List of Priorities Listing Request West 66th Street and Vincent Avenue, Richfield (SA4586)

Minnesota Pollution Control Agency (MPCA) Site Assessment Program (SA) recommends referring the West 66th Street and Vincent Avenue Site in Richfield, (the Site) to the State Superfund program and listing it on the Minnesota Permanent List of Priorities (PLP). This will allow state funds to be used to conduct investigation activities and response actions. This Site is being referred to the MPCA Superfund program based upon the findings from a Site Assessment program investigation of the West 66th Street and Vincent Avenue Site (SA 4586) conducted from 2012-2014.

Background MPCA investigation results for the area around West 66th Street and Vincent Avenue South discovered the presence of perchloroethylene (PCE) and trichloroethylene (TCE) in ground water and soil vapor at concentrations above the regulatory criteria. Subsequent investigations focused on PCE and TCE in soil vapor which was detected over a three block area along both sides of W. 66th St, extending from Washburn Avenue on the west end to Thomas Avenue on the east end (see attached site figures for details). Maximum concentrations of PCE in soil vapor ranged up to 36,700 ug/m3. The residential Intrusion Screening Value (ISV) for PCE is 2 ug/m3. PCE is a commonly used chemical in the dry cleaning industry. There are several active and former dry cleaning operations in the neighborhood. Potential sources include the Pilgrim Clothing Care Center at 2901 W. 66th Street and the former Lindahl Cleaners located across W. 66th Street in the Southdale Square Shopping Center. However, it is not clear at this time if one or more sources for the contamination is present.

MPCA Investigation Activity There is limited investigative data regarding soil and groundwater at this site. The existing data indicate that both soil and groundwater may be contaminated with PCE or its degradation products. However, a source of the release has not yet been identified and the overall extent and magnitude of soil and groundwater contamination associated with this release is unknown. Because the earlier field investigations detected levels of PCE in soil vapor above regulatory criteria, further environmental response activities focused on assessing the soil vapor exposure risk and determining the need for mitigation. The MPCA’s investigation identified elevated sub-slab concentrations beneath the foundation slab at 2813 W 66th Street and at 6612 South Thomas Avenue. The concentration of PCE in these samples was high enough to be considered a potential imminent threat to human health. Mitigation of Imminent Threat Because of the elevated levels of PCE in soil vapor samples the MPCA Emergency Response Program was tasked to install sub-slab depressurization mitigation systems at each of the affected properties where PCE concentrations exceeded the regulatory ISVs. The area affected by the soil vapor plume included approximately thirteen residential properties. The MPCA received access from nine property owners to install sub-slab vapor mitigation systems. Sub-slab vapor mitigation systems have been installed in those nine properties. The owners of the remaining properties either refused access or did not respond to access requests. Human Health Risks The presence of elevated levels of PCE in soil vapors within the neighborhood at W. 66th St. and S. Vincent Ave. constitutes a significant health risk. PCE has been detected at levels more than 10,000 times the ISVs for residential properties in this area. Not only is this a potential soil vapor intrusion risk to the homes, but also to those who may need to excavate soil or work in areas below grade. The extent of soil vapor contamination has not yet been fully determined. The risk of direct soil or groundwater exposure is unknown because the extent and magnitude of soil and groundwater contamination is unknown at this time. Conclusion Site investigation work to date has demonstrated the presence of elevated concentrations of PCE in soil vapor in the neighborhood near W. 66th Street and S. Vincent Avenue in Richfield. Groundwater and soil vapor concentrations from samples collected at or nearby the Site indicate that PCE is present in groundwater and soil vapors at concentrations of regulatory concern. Additional investigation is necessary to determine the extent and magnitude of the release(s) and the source area(s). Soil vapor concentrations of PCE were high enough to warrant installation of vapor intrusion mitigation systems at a number of residences to mitigate the exposure potential. Potential sources for the PCE contamination include the Pilgrim Cleaners site located at 2901 W. 66th Street and the former Lindahl Cleaners, located north of 66th Street in the Southdale Square shopping

center. Additional investigation is necessary to determine the extent and magnitude of the release(s) and the source area(s). Listing this Site on the state PLP will allow the MPCA to access state funding to conduct the additional work that is needed which includes: 1) Determining the extent and magnitude of soil vapor contamination associated with this Site. 2) Determining if there are additional residences that require installation of vapor mitigation systems. 3) Determining the extent and magnitude of groundwater contamination associated with this site. 4) Determining the extent and magnitude of soil contamination associated with this site. 5) Identify and define the contaminant source area(s) and identify the Potentially Responsible Parties (PRP) for the contamination that led to this situation. 6) Require the PRP(s) to conduct investigation and remediation activities in accordance with State and Federal cleanup requirements. Seek to recover costs for the initial site response from the PRP(s).

Legend

former Lindahl Cleaners

Parcel

Residence where SSD System was Installed by MPCA

Soil Vapor Area of Concern

Neighborhood

Street

Eddie Z's Car Wash

Southdale Square Retail Center

City

Dairy Queen

Thomas Ave S

Vincent Ave S

County

Pilgrim Cleaners

W 66th St

Upton Ave S

Washburn Ave S

Super America

North

Approx Scale 0 ft 100 ft 0

50

100ft

Base map by Hennepin County GIS Webserver, 2015

Soil Vapor Area of Concern & Residential Properties Mitigated with SSD Systems West 66th St. and Vincent Ave. Site Richfield, Hennepin County, Minnesota MPCA Site Assessment Site SA4586

DEPARTMENT POLLUTION CONTROL AGENCY :

SF-00006-05 (4/86)

STATE OF MINNESOTA

Office Memorandum

DATE: 5/2/2016 TO: Sandeep Burman Manager Site Remediation & Redevelopment Section Remediation Division FROM: Crague Biglow Supervisor Site Remediation & Redevelopment Section Remediation Division Wayne Sarappo Site Remediation Unit 1 Site Remediation & Redevelopment Section Remediation Division

SUBJECT: Permanent List of Priorities Request Hospital Linen Site, St. Paul, MN (SA248)

Minnesota Pollution Control Agency (MPCA) staff in the Site Assessment Program recommend referring the Hospital Linen site, located at 740th 7th Street East, St. Paul (the Site), to the State Superfund Program and listing it on the Minnesota Permanent List of Priorities (PLP), so that state funds can be used to conduct response actions. This Site is being referred to the MPCA Superfund Program based upon the findings from MPCA Site Assessment (SA) program investigations (MPCA Project Number SA248). The location of the Site is shown in Figure 1. Background The Site has been redeveloped through the voluntary Investigation and Cleanup (VIC) Program and is now a Mississippi Market store with an active sub-slab mitigation system. The Site is located at the intersection of Maple Street and East 7th Street, about one mile east of downtown St. Paul. Residential properties, as well as a few commercial properties, are located adjacent to the Site. A commercial laundry, Hospital Linen Services, operated at the Site from the 1920s until the early 2000s. During the 1950s to the 1980s, laundry operations included industrial dry-cleaning. After the building was demolished in 2005, an environmental investigation discovered perchloroethylene (PCE), in soil beneath the portion of the Site where dry-cleaning operations had occurred. PCE is a solvent that is commonly used in the dry-cleaning process which has the potential to cause long term human health risks. Spills or leaks from dry-cleaning equipment or chemical storage tanks may have occurred when dry-cleaning operations were active at the site. Most of the PCE in soil was below the land surface, and the concentrations of PCE in soil did not exceed the screening levels that MPCA uses to evaluate risk from direct contact with the soil. Thus, the PCE in soil did not pose a risk to people who may have come into contact with soil at the Site. However, PCE often moves down through the soil to the groundwater and causes RECYCLED PAPER WITH A MINIMUM OF 10% POSTCONSUMER WASTE

groundwater to become contaminated. Therefore, an extensive soil remediation was completed at the Site in 2008, during which PCE-contaminated soil and a buried layer of ash was removed from the Site. The contaminated soil and ash was disposed of at a permitted landfill, and clean soil was used to backfill the large excavation. As part of a redevelopment project at the Site, soil vapor samples were collected and concentrations of PCE greater than 100-times the Industrial Intrusion Screening Value (ISV) were present in the soil vapor samples. When MPCA staff reviewed these results, the Site was referred to the MPCA Site Assessment Program for further investigation. Current MPCA Investigation and Mitigation Activity In 2014, the MPCA SA Program conducted vapor intrusion activities in the residential areas surrounding the Site to identify residences that may be impacted by the Site. More specific objectives were to investigate the extent and magnitude of contamination to soil, groundwater, and soil vapor, and to evaluate potential risks to human health and environment, both imminent and long-term. Twenty nine properties are undergoing vapor intrusion assessment in accordance with MPCA guidance (Figure 2). To date, fourteen of the twenty nine properties have been sampled. Winter sub-slabs samples were collected from six of the fourteen properties where the initial sub-slab sample results were less than 10-times the ISVs in order to obtain a more accurate sample. Of the twenty five properties undergoing vapor intrusion assessment, detailed specifications were prepared for the installation of subslab depressurization systems (SSDS) at four residences where sub-slab sampling results exceeded 10-times the residential ISV. During November 2014, the requested proposals were received from Minnesota-certified radon contractors, bid documents were prepared, and the systems were bid, and awarded. Pre- diagnostic testing commenced and has been completed at three properties. System installations for three properties and pre-diagnostic testing for one property were scheduled for installation in April 2015. Based on the sub-slab sampling completed to date, an additional five properties not covered in the November 2014 round of bidding require SSD systems. Twenty-nine residents were sent letters in 2014, 2015, and 2016, requesting that they sign and return the access agreements to allow MPCA to conduct sub-slab sampling. Of the twenty-nine residents contacted by letter, 16 allowed their building to be sampled, four of which needed and had SSDS installed. Thirteen residents never responded. The SA Contractor recommended that based on the results of the sub-slab sampling completed to date, sub-slab samples should be collected from an additional sixteen properties to define the extent of the vapor contamination. On May 4, 2016, sixteen letters were mailed to residents requesting them to sign access agreements to allow the MPCA to conduct sub-slab vapor sampling. No responses have been received to date. Most of the recent work has been done to assess the risk to potential vapor intrusion receptors. However, further definition of the source areas and source area remediation will be done when funding is available after the site has been listed. Conclusion Elevated levels of PCE have been detected in soil gas, groundwater, and four residences in the vicinity of the Hospital Linen Site, located in St. Paul, Minnesota. Vapor mitigation systems were installed in the four residential properties where the sub-slab vapor samples exceeded 10 times the ISV. Five residential houses still remain with PCE concentrations greater than 10 times the Residential ISV in the building sub-slab samples. Vapor Intrusion Interior Building surveys are scheduled to be completed for twenty five additional residential properties by June

30, 2016. Based on the sub-slab vapor concentrations observed from other nearby properties, these additional residences may also require vapor mitigation. Additional sub-slab vapor sampling and mitigation work may be needed to address potential vapor intrusion risks at nearby residences. Additional investigation may also be necessary to identify and define the sources of contamination. Soil and groundwater may also need to be remediated to address the source of the contamination. Therefore, the Hospital Linen Site should be listed on the State PLP so that the MPCA can perform additional investigations to determine the potential risks to receptors associated with the identified release and to determine additional corrective actions, if necessary.

4/25/2016

Former Hospital Linen Arden Hills

Shoreview

Vadnais Heights

White Bear Lake

Little Canada Roseville Maplewood

Grant

North Saint Paul

Falcon Heights

Lake Elmo

Oakdale

Site area

Saint Paul

Woodbury West Saint Paul Mendota Heights

South Saint Paul Newport 0

½

1

2 Miles

¯

4/25/2016

Former Hospital Linen Site boundary Vapor intrusion area of concern

0 37.5

DEPARTMENT:

DATE:

POLLUTION CONTROL AGENCY

SF-00006-05 (4/86)

STATE OF MINNESOTA

Office Memorandum

5/23/2016

TO:

Sandeep Burman Manager Site Remediation & Redevelopment Section Remediation Division

FROM:

Crague Biglow Supervisor Site Remediation & Redevelopment Section Remediation Division

Allan Timm Site Remediation Unit 1 Site Remediation & Redevelopment Section Remediation Division SUBJECT:

Permanent List of Priorities Listing Request Southeast Hennepin Area Groundwater and Vapor Site, Minneapolis MN (SA249)

Minnesota Pollution Control Agency (MPCA) staff recommends listing the Southeast Hennepin Area Groundwater and Vapor Site (the Site) on the Minnesota Permanent List of Priorities (PLP). This will allow state funds to be used to complete additional investigation and response actions. This Site is being referred to the MPCA Superfund Program based upon the findings from MPCA Site Assessment (SA) program investigations of the Site (MPCA Project Number SA249). Background The Southeast Hennepin Area Groundwater and Vapor Site, located in Minneapolis MN, is bounded to the north by Broadway Street NE, to the east by Industrial Boulevard NE, to the south by Hennepin Avenue and Taft Street NE to the west. The location of the Site is shown in Figures 1 and 2. The general location of the site may be amended as environmental investigations identify the area(s) where hazardous substances, or pollutants or contaminants, are deposited, stored, disposed of, placed or otherwise come to be located. Properties within the Site area consist of residential homes along parts of 19th Avenue SE to 23 Avenue SE bounded by SE Hennepin Avenue to the north and Elm Street SE to the south. The Site consists of properties up-gradient (northeast) and side-gradient (east and southeast) from the General Mills Superfund Site (MPCA Project Number SR3). Within the Site are manufacturing, plating, vehicle repair, and dry cleaning facilities that in the past have used or are currently using hazardous chemicals. The primary contaminants of concern are trichloroethylene (TCE) and perchloroethylene (PCE). TCE and PCE are solvents used for metal cleaning and other industrial processes. PCE is also a commonly used solvent in the dry cleaning industry. TCE is also a breakdown product of PCE as it degrades. Both compounds have the potential to cause long term human health risks. Historic Investigations Timeline: 

In 2001, TCE was detected in the groundwater at the Anne Gendein Trust property, located at 359 Hoover Street. TCE was reported at a concentration of 3,500 micrograms per liter (ug/l). There were no groundwater receptors at the time of the investigation and there was an OffSite Source Determination. Soil vapor intrusion was not an identified pathway in 2001.

RECYCLED PAPER WITH A MINIMUM OF 10% POSTCONSUMER WASTE





In 2009, TCE was detected in the groundwater at the former Franks Auto Repair at a concentration of 1,620 ug/l. The former Franks Auto Repair is located southwest (downgradient) from the Anne Gendein Trust property. Soil vapor samples were not collected during the investigation. In 2013 and 2014 TCE was found in soil vapor samples collected below residential basement floors at properties east (up-gradient) of the General Mills Superfund Site testing area.

Summary of Current Groundwater Sampling Results:  During the fall and winter 2014 a groundwater investigation was completed by General Mills at the request of the MPCA. Monitoring wells were installed both northeast (up-gradient) and southwest (down- gradient) of the General Mills Site. Groundwater analytical results for the monitoring wells located northeast of the General Mills Site indicated that TCE was detected at a concentration of 3,290 ug/l in a monitoring well located up-gradient (northeast) of the former General Mills property. The current Health Risk Limit (HRL), established by the MDH, is 4 ug/l for PCE and 0.4 ug/l for TCE. No drinking water wells have been impacted. Summary of Current Soil Vapor Sampling Results:  During 2014, 2015, and 2016, sub-slab vapor samples were collected below the floor slab at twenty three residential buildings in the Site area. PCE or TCE concentrations were greater than ten times the established Intrusion Screening Value (ISV) for soil vapor at seven of the sampled residences. A vapor mitigation system has been installed at one property. An additional six properties will receive vapor mitigation systems during 2016. The highest TCE concentration in sub-slab vapor samples was 109 ug/m3 and the highest PCE concentration in sub-slab vapor samples was 20.5 ug/m3. Current MPCA Investigation and Mitigation Activity Based on past and current groundwater data there appears to be one or more sources of PCE and TCE up-gradient of the General Mills Superfund Site. These sources may be contributing to the contaminated groundwater plume. Most of the recent work to date has focused on assessing the potential vapor intrusion risk at residential properties in the Site area. Further groundwater and vapor investigation at commercial properties in the Site area will be done when funding is available after the site has been listed to determine the source and associated risks. Human Health Risks Vapor intrusion occurs when chemical vapors migrate from contaminated groundwater through the soil into buildings. These chemical vapors can degrade indoor air quality, sometimes to the point of posing risks to human health. In recent years, research has been shown that volatile organic compounds (VOCs), like TCE and PCE, entering a home through vapor intrusion may be more harmful than previously thought. This has prompted the ISVs of several VOCs including TCE and PCE to be lowered based upon recommendations by the Minnesota Department of Health (MDH). Conclusion Elevated levels of chlorinated solvents have been detected in soil gas and groundwater at the Site. Soil vapors containing TCE and PCE from this plume are above the screening criteria in samples collected below the building slab at several residential properties located within the area. A vapor mitigation system has been installed in one residential property. Vapor mitigation systems are scheduled to be installed in three additional residential properties.

Additional sub-slab vapor sampling and mitigation work is needed to address potential vapor intrusion risks. Additional investigation is needed to identify and define the sources of contamination. Soil and groundwater remediation may be needed to remove the source of the contamination. The SE Hennepin Area Groundwater and Vapor should be listed to the State PLP to perform additional investigation to determine the potential risks to receptors associated with the identified release and to determine any corrective actions, if necessary.

4/25/2016

SE Hennepin Area Groundwater and Vapor Site I-35W S I-35W N

Industrial Blvd

Godward St NE

Hoover St NE

Stinson Blvd NE

Taft St NE

SE Hennepin Area Groundwater and Vapor Site

0

0.04 0.08

0.16 Miles

¯

4/26/2016

SE Hennepin Area Groundwater and Vapor Site Columbia Heights

Fridley

Arden Hills

New Brighton

Saint Anthony

Washington Ave N

Dowling Ave N

Roseville MN-36 W MN-36 E

Washington Ave N

SE Hennepin Area Groundwater and Vapor Site

A

W 2 US-1

4 39

MN-280 MN-280

Minneapolis Falcon Heights

E 4 9 I- 3 U S1 E2

Saint Paul

E IE 4 -9 I

I-94 W

lis MMinnnneeaappoo s Minneapoli 0

¼

½

1 Miles

¯

DEPARTMENT:

DATE: TO:

FROM:

POLLUTION CONTROL AGENCY

SF-00006-05 (4/86)

STATE OF MINNESOTA

Office Memorandum

5/23/2016 Sandeep Burman Manager Site Remediation and Redevelopment Section Remediation Division Crague Biglow Supervisor Site Remediation and Redevelopment Section Remediation Division

Allan Timm Site Remediation Unit 1 Site Remediation and Redevelopment Section Remediation Division SUBJECT:

Permanent List of Priorities Listing Request Lyndale Avenue Corridor, Bloomington, MN (SA243)

Minnesota Pollution Control Agency (MPCA) staff in the Site Assessment Program recommend referring the Lyndale Avenue Corridor site, located approximately three blocks east and west of Lyndale Avenue between 83rd Street and 98th Street (the Site), to the State Superfund Program and listing it on the Minnesota Permanent List of Priorities (PLP), so state funds can be used to conduct response actions. This Site is being referred to the MPCA Superfund Program based upon the findings from MPCA Site Assessment (SA) program investigations. (MPCA Project Number SA243). The location of the Site is shown in Figures 1 and 2. Background The Lyndale Avenue Corridor is located in Bloomington, Minnesota and is bounded by 83rd Street to the north, 98th Street to the south, Nicollet Avenue to the east, and Bryant Avenue to the west. The Site area may be amended as investigations identify the area(s) where hazardous substances, pollutants or contaminants were stored, deposited, disposed of or used. Within the Site area are manufacturing, vehicle repair, and dry cleaning facilities that in the past have used or are currently using hazardous chemicals. Residential properties are also located in the Site area. Investigation work at over 40 individual properties has found contamination along the Lyndale Avenue Corridor between 83rd Street and 98th Street. The MPCA has overseen investigations of approximately eight petroleum releases through the Petroleum Remediation Program and thirty-five sites containing non-petroleum chemicals through the Voluntary Investigation and Clean-up Program.

RECYCLED PAPER WITH A MINIMUM OF 10% POSTCONSUMER WASTE

The primary contaminants of concern are trichloroethylene (TCE) and perchloroethylene (PCE). TCE and PCE are volatile organic compounds (VOCs) used for metal cleaning and other industrial processes. PCE is also a commonly used solvent in the dry cleaning industry. TCE can also occur from the breakdown of PCE. Both compounds have the potential to cause long term human health risks. Timeline: Referral to MPCA Site Assessment Program 

In 2009 one property located at the NE corner of 35W and 94th Street was referred to the MPCA Site Assessment Program because VOCs were found in the groundwater.

Review of existing data and information from sites in the Lyndale Ave Corridor Area  In 2010 Site Assessment completed an internal review of contaminated properties in the Lyndale Avenue Corridor.  In June 2012 an Area-Wide Groundwater Contamination Study was completed to look at potential source areas and receptors. The study provided an inventory and summary of existing data from known contaminated properties, compiled lists of former dry cleaners in the study area, summarized existing groundwater data, and provided a report identifying public and private drinking water wells. Collection of new groundwater and soil vapor data  An investigation completed in June 2013, helped further define the current extent of PCE and TCE contamination in groundwater and also potential vapor intrusion risks.  The highest VOC concentrations detected in groundwater were 1,000 ug/l PCE and 230 ug/l TCE, which is above the current Minnesota Department of Health (MDH) Health Risk Limit (HRL) of 4 ug/l for PCE and 0.4 ug/l for TCE. No drinking water wells have been impacted at this time.  The highest soil vapor concentration of PCE was 3,850 ug/m3, which was approximately 2,000 times the established soil vapor Intrusion Screening Value (ISV) for residential properties of 2 ug/m3 for PCE and 2 ug/m3 for TCE. Soil vapor concentrations were greater than ten times the PCE ISVs in five of the fifteen soil gas samples collected. Collection of sub-slab vapor samples from below the basement floor in buildings  In 2014, sub-slab soil vapor samples were collected from eight residential properties and four commercial properties. The sampling found elevated concentrations of VOCs in sub-slab soil vapor samples collected at residential properties along the 9200 block of Aldrich and Bryant Avenues.  The highest sub-slab concentration of PCE detected below a residential building was 19,200 ug/m3 (approximately 10,000 times the ISV) at the 9200 Aldrich Avenue South block.  All of the residential properties had soil vapor concentrations at or above the screening criteria.  The highest PCE concentration below a commercial property was 186,000 ug/m3 (93,000 times the ISV) at a restaurant on the 9400 Lyndale Avenue South block.  All of the commercial properties had soil vapor concentrations at or above the screening criteria.

Installation of vapor intrusion mitigation systems  Vapor mitigation systems have been installed at eight residential properties to date.  Residential properties were prioritized for vapor mitigation. Additional vapor mitigation will likely be needed in several commercial properties once additional funding is obtained. Current MPCA Investigation and Mitigation Activity Based on the soil vapor and groundwater data there appears to be multiple sources of VOC contamination in the area. Most of the recent investigation work has been completed to assess potential vapor intrusion risks. Further definition of the contaminated groundwater source areas will be required to fully define the soil vapor area of concern. Based on these investigations, source area remediation will likely be required in the future after the site has been listed on the PLP. The sub-slab soil vapor investigation is also being expanded to include single family and multiple family residential properties on the north side of 92nd Street between Lyndale and Bryant Avenue. Human Health Risks Vapor intrusion occurs when chemical vapors migrate from contaminated groundwater through the soil into buildings. These chemical vapors can degrade indoor air quality, sometimes to the point of posing risks to human health. In recent years, research has shown that volatile organic compounds (VOCs) entering a home through vapor intrusion may be more harmful than we previously thought. This has prompted the Intrusion Screening Values (ISV) of several VOCs, like TCE and PCE, to be lowered based upon recommendations by the MDH. Conclusion Elevated levels of TCE and PCE have been detected in soil gas and groundwater in the vicinity of the Lyndale Avenue Corridor site in Bloomington, Minnesota. There appears to be multiple source areas for the contamination. TCE and PCE soil vapors from this plume are above the screening criteria in samples collected below the building slab at residential and commercial properties located within the site area. Vapor Mitigation systems have been installed in eight residential properties to date. Based on the sub-slab soil vapor concentrations from pending assessments, several commercial properties may also require vapor mitigation. Additional sub-slab vapor sampling and mitigation work is needed to address potential vapor intrusion risks. Additional investigation is needed to identify and define the sources of contamination along with the horizontal extent. Soil and groundwater remediation may be needed to remove the source of the contamination.

The Lyndale Avenue Corridor site should be listed to the State PLP to perform additional investigation to determine the potential risks to receptors associated with the identified release and to determine any corrective actions, if necessary.

4/25/2016

MN-100 N

Lyndale Avenue Corridor

Edina MN-100 S

Richfield

I-494 E I-494 W

I-35W N I-35W S

MN-5 E

Bloomington

Eagan

Burnsville

0

¼

½

1 Miles

¯

Lyndale Avenue Corridor

Study area

W. 86th Street

Lyndale Avenue South W. 94th Street

4/25/2016

DEPARTMENT:

DATE: TO:

FROM:

SF-00006-05 (4/86)

POLLUTION CONTROL AGENCY 5/2/2016

STATE OF MINNESOTA

Office Memorandum

Sandeep Burman Manager Site Remediation and Redevelopment Remediation Division

Crague Biglow Supervisor Site Remediation and Redevelopment Section Remediation Division Mark Ostby Hydrologist Site Remediation and Redevelopment Section Remediation Division

PHONE: SUBJECT:

651-757-2283 Permanent List of Priorities Listing Request Arcade Street and Hawthorne Avenue East, St. Paul (SA 4596)

Minnesota Pollution Control Agency (MPCA) staff recommends listing the Arcade Street and Hawthorne Avenue site (the Site) in St. Paul, Minnesota on the Minnesota Permanent List of Priorities (PLP). This will allow state funds to be used to conduct investigation activities and response actions. This site is being referred to the MPCA Superfund program based upon the findings from an investigation completed by the MPCA Site Assessment (SA) program under SA 4596. Background The Site is located near the intersection of Arcade Street and Hawthorne Avenue East in an area of mixed commercial and residential use. It is bounded to the North by Orange Avenue East, to the West by Arcade Street, to the South by Maryland Avenue East, and extends roughly ½ block to the East of Arcade Street as depicted on the attached Figure 1. A dry-cleaner and an auto service station were historically operated on the Site property. Currently the site property is a vacant parking lot. The Site was first referred to MPCA SA in 2011 as a result of perchloroethylene (PCE) contamination detected during an environmental investigation conducted by a potential purchaser of the property. PCE is a chemical used in the dry-cleaning industry and is used for other industrial purposes as a solvent and degreaser.

To facilitate the property transfer, the Site was entered into the Voluntary Investigation and Cleanup (VIC) program to obtain a No Association Determination (NAD) for the purchaser. The VIC program review identified PCE contamination in soil and groundwater above regulatory standards. MPCA Investigation Activity The MPCA SA investigation of the Site began in 2012. The investigation included sampling of soil, groundwater, and soil vapor. This initial sampling work discovered soil contamination on the Site property in the area of the former dry cleaner operation. This investigation also confirmed that PCE contaminated groundwater and soil vapor had migrated off the Site property however the full extent of contamination was not achieved during the 2012 sampling event. Additional investigation was completed from 2013-2016 by the MPCA SA program. The conclusions from this investigation revealed the horizontal extent of PCE contaminated soil vapor was larger than was previously understood in 2012. Soil vapor sampling from the investigation area found concentrations of PCE up to 1,460,000 µg/m3, well above the residential Intrusion Screening Value (ISV) of 2 micrograms per cubic meter (µg/m3 ). Based on this data the revised area of vapor intrusion concern now includes two businesses and several residential homes near the Site (see attached map). A neighboring business to the south of the Site has recently been found to have potential vapor intrusion impacts and steps are currently being taken to mitigate the building. Further investigation is necessary to determine if the surrounding homes and businesses within the expanded area of concern are at risk for vapor intrusion and to further define the extent of the groundwater contamination associated with this site. Human Health Risks Vapor intrusion occurs when chemical vapors migrate from contaminated groundwater through the soil into buildings. These chemical vapors can degrade indoor air, sometimes to the point of posing risks to human health. In recent years, research has shown that volatile organic compounds (VOCs), like PCE, entering a home through vapor intrusion may be more harmful to human health than previously thought. This has prompted a lowering of the Intrusion Screening Value (ISV) of several VOCs including PCE based upon recommendations by the Minnesota Department of Health (MDH). The primary effects from long term inhalation exposure to chlorinated solvents are neurological, including impaired cognitive and motor neurobehavioral performance. Chlorinated solvent exposure may also cause adverse effects in the kidney, liver, immune system and hematologic system, and on development and reproduction. Sensitive populations including women who are pregnant or may become pregnant, infants and young children, elderly persons, or people with chronic diseases or a compromised immune system are especially vulnerable to PCE vapors. Conclusion Site investigation work to date has demonstrated the presence of elevated concentrations of PCE in soil vapors in the St. Paul neighborhood of Arcade Street and Hawthorne Avenue East. PCE in soil vapor was reported at concentrations of 1,460,000 ug/m3. These levels far exceed the regulatory ISVs used to evaluate human health risks for soil vapor intrusion. Additional residential and commercial properties are potentially at risk from the contamination associated with this site however further investigation and sampling will be needed to fully understand these risks. Listing this site on the Minnesota State

Superfund PLP will allow the MPCA to access state funding to conduct additional work that is needed for this site which includes: 1) Determining the full extent and magnitude of soil vapor contamination associated with this site. 2) Determining if there are additional residences or commercial buildings that require the installation of soil vapor mitigation systems. 3) Identify and determine source(s) of the PCE contamination in groundwater which is acting as the source for contaminated soil vapors. 4) Determining the extent and magnitude of groundwater contamination associated with this site. 5) Completing source area remedial actions to reduce the quantity of PCE present in the subsurface. 6) Identify and define the contaminant source area(s) and identify the Potentially Responsible Parties (PRP) for the contamination that led to this situation. 7) Require the PRP(s) to conduct investigation and remediation activities in accordance with State and Federal cleanup requirements. Seek to recover costs for the initial site response from the PRP(s).

Figure 1: Arcade Street and Hawthorne Ave

Figure 2: Arcade Street and Hawthorne Ave – Detailed Map

DEPARTMENT:

DATE: TO:

FROM:

POLLUTION CONTROL AGENCY 5/2/2016

SF-00006-05 (4/86)

STATE OF MINNESOTA

Office Memorandum

Sandeep Burman Manager Site Remediation and Redevelopment Remediation Division

Crague Biglow Supervisor Site Remediation and Redevelopment Section Remediation Division Mark Ostby Hydrologist Site Remediation and Redevelopment Section Remediation Division

PHONE: SUBJECT:

651-757-2283 Permanent List of Priorities Listing Request 55th Street and Lyndale Avenue South Site, Minneapolis

The Minnesota Pollution Control Agency (MPCA) Site Assessment Program recommends referring the 55th Street and Lyndale Avenue South site (the Site) in Minneapolis, to the MPCA State Superfund program and listing it on the Minnesota Permanent List of Priorities (PLP). This will allow state funds to be used to conduct additional investigation activities and response actions. This site is being referred to the MPCA Superfund program based upon the findings from a MPCA Site Assessment (SA) investigation of two adjacent properties that have been investigated under SA 239 and SA 4604. Background The Site is located in an area of mixed commercial and residential use in South Minneapolis around the intersection of 55th Street and Lyndale Ave South. The Site is bounded to the north by 54th Street, to the west by Aldrich Ave South, to the east by Garfield Ave South., and extends just to the south of 55th Street as shown on the attached Figure 1. The general location of the site may be amended as environmental investigations identify the area(s) where hazardous substances, or pollutants, or contaminants are deposited, stored, disposed or otherwise become located. This Site was originally referred to MPCA SA program in 1999 as a result of an environmental investigation conducted by the property owner to facilitate a property transfer at a former dry-cleaning operation depicted in the attached site figures.

Groundwater concentrations of perchloroethylene (PCE), a volatile organic compound (VOC), were above the Minnesota Department of Health (MDH) regulatory limits, but due to the lack of drinking water wells in the area, the Site was not considered a priority because the contamination did not pose a risk at that time. A petroleum release investigation in 2010 at a neighboring Site revealed the presence of PCE in groundwater and in soil vapor near the original Site. It should be noted that vapor intrusion assessments were not completed at the time of the original investigation in 1999. Vapor intrusion occurs when vapors originating from VOCs in groundwater migrate through the soil into buildings. These chemical vapors can degrade indoor air, sometimes to the point of posing risks to human health. The MPCA began examining vapor intrusion at contaminated sites with VOCs beginning in 2006. MPCA Investigation Activity The MPCA SA started its investigation of the Site area in 2012 and began examining the potential sources of PCE contamination. The investigation included the review of environmental databases, aerial photographs, historical records, city files and other site reconnaissance. Soil vapor samples were also completed as part of this initial scope of work. This investigation identified the former dry-cleaning operation located near the Site and began to define the area of groundwater and soil vapors that were contaminated. A series of soil vapor investigations occurred from 2013–2015 which discovered the potential for vapor intrusion at several nearby residences along Aldrich Avenue South and businesses located to the south and southeast of the Site. A vapor intrusion mitigation system was installed in the office area of the Midas Muffler property in 2014 due to soil vapors exceeding 100 times the industrial indoor air standard of 30 micrograms per cubic meter (30ug/m3) for PCE underneath the building. Additional soil vapor sampling to further define the extent of PCE contamination is ongoing. We have installed vapor intrusion mitigation systems in five nearby residential homes with additional mitigation systems likely needed in four neighboring residences. In addition the possibility of vapor intrusion will also need to be addressed in a larger nearby building. Human Health Risks Vapor intrusion occurs when chemical vapors migrate from contaminated groundwater through the soil into buildings. These chemical vapors can degrade indoor air, sometimes to the point of posing risks to human health. In recent years, research has shown that volatile organic compounds (VOCs), like PCE, entering a home through vapor intrusion may be more harmful to human health than previously thought. This has prompted a lowering of the Intrusion Screening Value (ISV) of several VOCs including PCE based upon recommendations by the Minnesota Department of Health (MDH). The primary effects from long term inhalation exposure to PCE are neurological, including impaired cognitive and motor neurobehavioral performance. PCE exposure may also cause adverse effects in the kidney, liver, immune system and hematologic system, and on development and reproduction. Sensitive populations including women who are pregnant or may become pregnant, infants and young children, elderly persons, or people with chronic diseases or a compromised immune system are especially vulnerable to PCE vapors.

Conclusion Site investigation work to date has demonstrated the presence of elevated concentrations of PCE in soil vapors in the Minneapolis neighborhood of 55th Street and Lyndale Ave South. The PCE reported from sampling activities at the Site exceed ISVs used to evaluate human health risks for soil vapor intrusion. Additional residential and commercial properties are potentially at risk from the contamination associated with this site however further investigation and sampling will be needed to fully understand these risks. Listing this site on Minnesota State Superfund PLP will allow the MPCA to access state funding to conduct additional work that is needed which includes: 1) Determining the full extent and magnitude of soil vapor contamination associated with this site. 2) Determining if there are additional residences or commercial buildings that require the installation of soil vapor mitigation systems. 3) Identify and determine the source(s) of the PCE contamination in groundwater which is acting as the source for contaminated soil vapors. 4) Determining the extent and magnitude of groundwater contamination associated with this site. 5) Identify and define the contaminant source area(s) and identify the Potentially Responsible Parties (PRP) for the contamination that led to this situation. 6) Require the PRP(s) to conduct investigation and remediation activities in accordance with State and Federal cleanup requirements. Seek to recover costs for the initial site response from the PRP(s).

DEPARTMENT:

DATE: TO:

FROM:

PHONE: SUBJECT:

POLLUTION CONTROL AGENCY 5/2/2016

SF-00006-05 (4/86)

STATE OF MINNESOTA

Office Memorandum

Sandeep Burman Manager Site Remediation and Redevelopment Remediation Division

Crague Biglow Supervisor Site Remediation and Redevelopment Section Remediation Division Rick Jolley Hydrogeologist Site Remediation and Redevelopment Section Remediation Division 651-757-2608/651-757-2475 Permanent List of Priorities Listing Request University Ave & Pascal Street Site, St. Paul (SA132)

Minnesota Pollution Control Agency (MPCA) staff in the Site Assessment Program (SA) recommends referring the University Avenue and Pascal Street Area site (the Site) to the State Superfund Program and listing it on the Minnesota Permanent List of Priorities (PLP). This action is being requested so that state funds can be used to conduct additional investigation activities and response actions. This Site is being referred to the MPCA Superfund program based upon results from the MPCA Site Assessment Program investigation of the Site (MPCA Project Number SA132) conducted from 2014-2016 and investigation results conducted by Kline Auto World (KAW) on the adjacent Voluntary Investigation and Cleanup (VIC) site (MPCA Project Number VP27960) from 2012-2015. Background The Site is located east of the University Avenue and Pascal Street intersection in the Midway-Hamline neighborhood of St. Paul, MN as depicted on the map attached as Figure 1. The general location of the site may be amended as environmental investigations identify the area where hazardous substances, or pollutants or contaminants are deposited, stored, disposed of placed or otherwise are located. The primary contaminants of concern at this site are the volatile organic compounds (VOCs) trichloroethylene (TCE) and perchloroethylene (PCE). TCE and PCE are chlorinated solvents used for metal cleaning and other industrial processes. PCE is a chemical used in the dry cleaning industry. Further, TCE can be a breakdown product of PCE. Both chemicals have potential to create long-term human health risks. PCE and TCE have been identified in groundwater and in soil vapor samples at the site. PCE and TCE were initially identified during voluntary investigations conducted by KAW on their property at the northwest corner of University Avenue and Pascal Street.

KAW investigation results identified TCE and PCE releases from past activities on the KAW commercial redevelopment property although the more significant PCE and TCE impacts were determined to have originated from an off-site source located east and southeast of the KAW property. KAW has identified PCE and TCE concentrations in groundwater along the east side of Pascal Street ranging in concentration up to 56 micrograms per liter (µg/L) and 360 µg/L, respectively. The PCE and TCE concentrations in groundwater at the Site exceed their respective Minnesota Department of Health (MDH) Health Based Value (HBV) of 4 µg/L and 0.4 µg/L. PCE and TCE in soil vapor samples collected along Pascal St. reported up to 1200 micrograms per cubic meter (ug/m3) and 2200 ug/m3 respectively. These soil vapor concentrations exceed the MPCA industrial Intrusion Screening Values (ISV) for evaluating vapor intrusion risks of 300 µg/m3 and 60 µg/m3. The elevated soil vapor concentrations of PCE and TCE was determined to represent potential vapor intrusion risks for residents of single-family homes located along Sherburne Avenue. The MPCA agreed to investigate PCE and TCE releases beyond the KAW property while KAW continued to address concerns on their site under the MPCA VIC Program. MPCA Investigation Activity The MPCA SA program through the use of a multi-site contractor has conducted groundwater and soil vapor investigations east, north, and northeast the KAW property from 2014-2016. The Site’s primary focus has been to identify and mitigate potential vapor intrusion risks posed by contamination from the Site, to determine the extent of the PCE and TCE contamination in soil vapor and to search for potential contaminant sources. Subsurface soil vapor investigations identified potential vapor concerns at residential homes along Sherburne Avenue north of the KAW property and north of commercial properties and businesses along University Avenue (Figure 2). The sampling results suggested the presence of possible sources of the TCE and PCE in groundwater and in soil vapor originating from one or more of the commercial properties along University Avenue between Pascal Street and Albert Street. Sub-slab soil gas samples have been collected from thirteen residential properties from which the MPCA sought and obtained access from property owners. Seven of the thirteen residential properties sampled had TCE and/or PCE sub-slab sampling results exceeding the residential ISVs. Active soil vapor mitigation systems were installed in these seven properties after obtaining access from the property owners. PCE and TCE in soil vapor has been reported up to 47,300 ug/m3 and 68,800 ug/m3 respectively near commercial properties located between Pascal Street and Albert Street along University Avenue. Elevated soil vapor concentrations have also been found near residential properties along Sherburne Avenue. Based on these and other nearby sampling results the MPCA SA Program has plans to mitigate a total of five commercial businesses along University Avenue.

PCE and TCE have been identified in groundwater at levels up to 60 ug/l and 165 ug/L, respectively, near the Pascal St and University Ave Intersection. Potential sources for the PCE and TCE groundwater contamination include commercial properties east of the KAW property and from the former Midway Plaza VIC site (VP1700) located south of University Avenue (Figure 2). The former Midway Plaza VIC site underwent a groundwater investigation and remediation for PCE and TCE originating from a dry cleaner at the Midway Plaza shopping center during the 1990’s. The Midway Plaza VIC site was closed in 2003. The MPCA intends to pursue further characterization of contaminated groundwater and soil vapor, to identify potential sources of contamination, and to conduct vapor intrusion mitigation to address identified risks at the Site. Once contaminant sources are identified either the MPCA or identified responsible parties will conduct remedial activities to address soil, groundwater and soil vapor contamination. Human Health Risks The primary human health concerns are vapor intrusion risks resulting from PCE and TCE impacts in groundwater and in soil vapors. Vapor intrusion has the potential to degrade indoor air quality resulting in human health risks from inhaling PCE and TCE. The Site area is connected to the St. Paul municipal drinking water system which is not impacted by the Site release(s). Seven registered commercial wells completed in bedrock aquifers are located within one mile of the Site however these wells are not at risk since they are completed at depths significantly greater than the identified groundwater contamination at the Site. Conclusion The site should be listed on the PLP in order to access State Superfund funding to allow further delineation of the PCE and TCE sources in soil and groundwater, complete additional building-specific vapor intrusion investigations and install vapor intrusion mitigation systems when risks are identified. Additional source area response actions may also be necessary once the sources of contamination have been defined. Additional vapor intrusion assessment will be required near the residential properties located west, north, and east of the current investigation area. Additional groundwater sampling is also needed south of University Avenue in the area of the former Midway Plaza VIC site to determine if residual groundwater sources or soil vapors exist that needs to be addressed in this direction from the site. The distribution of PCE and TCE in groundwater and in soil vapor from the combined historic Midway Plaza site, the KAW VIC site and the MPCA Site Assessment investigation suggest multiple contaminant release sources are present at the Site.

Figure 1: North Midway Plaza Site Location

Figure 2: University Ave and Pascal St. Detailed Map

DEPARTMENT:

DATE: TO:

FROM:

POLLUTION CONTROL AGENCY 5/2/2016

SF-00006-05 (4/86)

STATE OF MINNESOTA

Office Memorandum

Sandeep Burman Manager Site Remediation and Redevelopment Remediation Division

Crague Biglow Supervisor Site Remediation and Redevelopment Section Remediation Division Christopher Formby Redevelopment Unit Site Remediation and Redevelopment Section Remediation Division

PHONE: SUBJECT:

651-757-2712 Permanent List of Priorities Listing Request Pure Oil Bulk Storage Facility No. 359643, 352 3rd Street, Excelsior (SA295)

Minnesota Pollution Control Agency (MPCA) staff recommends listing the Pure Oil Bulk Storage Facility No. 359643 property, located at 352 3rd Street in Excelsior (the Site) on the Minnesota Permanent List of Priorities (PLP). This will allow state funds to be used to conduct investigation activities and response actions. This Site was referred to the MPCA Site Assessment (SA) program from the MPCA Petroleum Remediation Program (Leak Site #19632) after perchloroethylene (PCE) was detected in groundwater and soil vapor, and it is now being referred to the MPCA Superfund program based on the findings of SA investigation. Background Formerly, the Site was a bulk oil storage facility. It is an active Petroleum Brownfield Program (PBP) and Petroleum Remediation Program (PRP) site with the Minnesota Pollution Control Agency (MPCA) under PB 4131 and Leak Site 19362 respectively. During the initial investigation in early 2013, the chlorinated solvents perchloroethylene (PCE) and trichloroethene (TCE) were detected in groundwater and in soil vapors. In 2013 PCE concentrations in groundwater were above the Minnesota Department of Health’s (MDH) Health Risk Limits (HRLs) for drinking water of 4 micrograms per liter (ug/l) with the highest concentration being 9.74 ug/l. PCE concentrations in soil vapor exceeded the MPCA’s Intrusion Screening Value (ISV) for commercial/industrial land use by over one-hundred times (100X) with the highest concentration being 2,200 micrograms per cubic meter (ug/m3 ).

An additional investigation conducted at the Site in early 2015 detected PCE in groundwater at two monitoring wells at concentrations almost twice the MDH’s HRLs for drinking water, and soil vapor samples again detected PCE and TCE. Concentrations of PCE were again greater than 100X the MPCA’s ISV for commercial/industrial land use. Sub-slab soil vapor samples were collected at three commercial buildings located on the Site in July of 2015 along with soil vapor samples around the perimeter of the Site. TCE was detected in one sub-slab sample above the MPCA’s ISV for commercial/industrial land use. PCE sub-slab concentrations below one of the buildings were 100X greater than the MPCA’s ISV for commercial/industrial land use with the highest sub-slab concentration for PCE being 102,000 ug/m3. To date, the full extent and magnitude of groundwater and soil vapor contamination has not been defined. Mitigation of Imminent Threat After reviewing the available data, MDH issued an expedited action determination for one of the buildings at the site to mitigate the immediate vapor intrusion risk to building occupants. A sub-slab depressurization system is currently being installed in the commercial building where sub-slab PCE vapors were detected at 102,000 ug/m3. Human Health Risks The presence of PCE in soil vapors on and off-site presents a significant human health risk to those occupying buildings in the area. There are numerous buildings adjacent to the Site and the extent and magnitude of the soil vapor release is unknown at this time. Responsible Party Engagement Formal Requests for Information have been drafted and are being reviewed by the Legal Service Unit prior to mailing. Conclusion Site investigation work has demonstrated the presence of elevated concentrations of PCE in the soil gas at the Site. The full extent and magnitude of the soil vapor release is still necessary. Additionally, the source of the PCE still needs to be investigated. Soil vapor concentrations of PCE have been elevated enough in one building to require mitigation. Additional sub-slab vapor sampling and mitigation work is needed to address potential vapor intrusion risks to off-site receptors. The Pure Oil Bulk Storage Facility No. 359643 Site should be listed to the State PLP to perform additional investigation and further determine the potential risks to receptors associated with the identified release and to determine any corrective actions, if necessary.

DEPARTMENT:

DATE: TO:

FROM:

POLLUTION CONTROL AGENCY 5/2/2016

SF-00006-05 (4/86)

STATE OF MINNESOTA

Office Memorandum

Sandeep Burman Manager Site Remediation and Redevelopment Remediation Division

Crague Biglow Supervisor Site Remediation and Redevelopment Section Remediation Division Christopher Formby Redevelopment Unit Site Remediation and Redevelopment Section Remediation Division

PHONE: SUBJECT:

651-757-2712 Permanent List of Priorities Listing Request Universal Plating, 1900, 1912, 1922 Monroe Street NE and 661 19th Ave NE, Minneapolis (SA114)

Minnesota Pollution Control Agency (MPCA) staff recommends listing the Universal Plating property, located at 1900, 1912, 1922 Monroe Street NE and 661 19th Ave NE in Minneapolis (the Site) on the Minnesota State Superfund Permanent List of Priorities (PLP). This will allow state funds to be used to complete additional investigation activities and response actions. This Site was referred to the MPCA Site Assessment (SA) program after an extended period of inactivity while enrolled in the Voluntary Investigation and Cleanup (VIC) program. This Site is being referred to the MPCA Superfund program based on investigations conducted by a voluntary party and by an investigation conducted by the SA program (MPCA Project Numbers VP27720, VP27721, and SA114). A viable Responsible Party does not exist for the Site. Background The Universal Plating Site operated as a chemical and mechanical plating and finishing facility from 1944 through 2009. The Site has been in the VIC program twice, with the last time being April 2014 when a Response Action Plan (RAP) was submitted by the voluntary party and approved by the MPCA. When the RAP was not implemented due to fading interest in redevelopment, the Site was referred to Site Assessment for further investigation. Subsurface investigations conducted in 2012 while enrolled in the VIC program detected metals in soil at concentrations that exceed the MPCA’s Soil Reference Values (SRVs) for residential land use. The metals included arsenic up to 20.1 mg/kg (SRV of 9mg/kg), cadmium up to 128 mg/kg (SRV of 25 mg/kg), chromium up to 610 mg/kg (SRV of 87mg/kg), copper up to 1750 mg/kg (SRV of 100 mg/kg), lead up to 7,350 mg/kg (SRV of 300 mg/kg), and nickel up to 515

mg/kg (SRV of 560 mg/kg). Volatile Organic Compounds (VOCs) detected in soil included cis-1,2 dichloroethene up to 44.1 mg/kg (SRV of 8 mg/kg), perchloroethylene (PCE) up to 10.2 mg/kg (SRV of 72 mg/kg), and trichloroethene (TCE) up to 60.8 mg/kg (SRV of 29 mg/kg). TCE and cis-1,2 dichloroethene concentrations exceed the MPCA’s SRVs for residential land use. Calculated benzo [a]pyrene (BaP) equivalents were detected in soil up to 5.35 mg/kg and cyanide was detected in soil up to 129 mg/kg, both of which exceed the MPCA’s SRVs for residential land use. VOCs detected in groundwater included PCE up to 2.7 ug/l and TCE up to 144 ug/l. The TCE concentration in groundwater is more than 360 times the current Health Risk Limit (HRL) of 0.4 ug/l set by the Minnesota Department of Health for drinking water. Methylene chloride was detected in soil vapors up to 206 ug/m3, and TCE was detected in soil vapors up to 1,650 ug/m3. The TCE concentration in soil vapors exceeds the MPCA’s Intrusion Screening Value (ISV) for residential land use by 275 times. Based on the significant risk to human health and the environment identified, the MPCA Site Assessment Program has referred this Site to our State Superfund program for oversight of further investigation and response actions. MPCA Investigation Activity In November 2015, MPCA SA conducted a subsurface investigation to determine whether soil vapors originating from the Site were migrating off-site and into the nearby residential neighborhood. Results from this investigation indicated that vapor intrusion off-site was not a concern. However, attempts to define the extent and magnitude of the groundwater releases were unsuccessful during the SA investigation and this investigation still needs to be completed. Human Health Risks The presence of metals and chlorinated solvents in soil presents a risk of direct exposure to skin. Although not a present concern, the migration of the groundwater plume containing elevated levels of TCE will likely create vapor intrusion risks in the near future. Soil vapor concentrations of TCE on the Site are currently well above the residential ISV. Conclusion This Site has an identified release of numerous metals, chlorinated VOCs, and PAHs to soil, groundwater and soil vapors. There is a risk of direct exposure to humans through the impacted soil at the Site. Groundwater at the Site has been greatly impacted by TCE, which has in turn produced high concentrations of TCE in soil vapor. If the groundwater plume migrates off-site, there is a potential for further off-site vapor intrusion risks in the future. Additional investigation is needed to fully define the extent and magnitude of the groundwater release. The Universal Plating Site should be listed to the State PLP to perform additional investigation and further determine the potential risks to receptors associated with the identified release and to determine any corrective actions, if necessary.

DEPARTMENT:

 

SF-00006-05 (4/86)

POLLUTION CONTROL AGENCY

STATE OF MINNESOTA

Office Memorandum 

  DATE:

May 2, 2016 

TO:

Sandeep Burman  Manager  Site Remediation & Redevelopment Section  Remediation Division 

THRU:

Crague Biglow  Supervisor  Site Remediation & Redevelopment Section  Remediation Division 

FROM:

Jennifer Jevnisek  Environmental Specialist 4  Site Remediation & Redevelopment Section  Remediation Division 

PHONE: SUBJECT:

651‐757‐2181 

   

 

 

 

Recommendation for Removal of Boyer Lumber Site (SR370) from the Permanent List of Priorities 

The Boyer Lumber site (Site) is located at 1504 4th Street South in Virginia, Minnesota, and consists of an  approximate 2.75‐acre tract of land that was undeveloped mining property until it was purchased and  developed in 1960. The property was used for the manufacture and storage of snow rakes until it was  purchased in 1976 by Kenneth C. and Katherine M. Boyer (collectively the “Boyers”).  From 1976 to  1999, the Boyers used the Site as a lumber yard and hardware store.  In 1999 Blue Water Venture  Partnership purchased the property and operated it as a retail home store until 2004, when Cedar Isle  Holdings purchased the property and leased it to Virginia Lumber and Hardware Inc. to operate a retail  lumber and hardware store.   

In August 1990, the Site was reported to the Minnesota Pollution Control Agency (MPCA) when a  petroleum release was discovered during the removal of a 500‐gallon underground storage tank.   Investigations were conducted under the Minnesota Pollution Control Agency’s Petroleum  Remediation Program (PRP) and Site Assessment Programs (SA) from 1990 to 2013. Contaminants  identified during this investigation period included volatile organic compounds (VOCs), polycyclic  aromatic hydrocarbons (PAHs), pentachlorophenol (PCP), and dioxins in soil, and VOCs, PAHs, and PCPs  in groundwater. Investigations for petroleum contaminants were completed by the MPCA PRP from  1990‐2009. Information regarding the PRP investigation was documented under PRP Leak 3645.  From  2006‐2009 the MPCA SA program provided technical assistance to the PRP for hazardous substances or  pollutants or contaminants that were discovered and reported during the petroleum investigation.  In  2009 the Site obtained regulatory closure from the MPCA PRP for petroleum contaminants at the Site.  From 2009 to 2013, the MPCA SA program conducted continued investigation of the hazardous  substances or pollutants or contaminants.      The MPCA listed the Site on the State Permanent List of Priorities (PLP) on February 25, 2014, with a  Hazard Ranking System (HRS) score of 1.   

Corrective Actions Completed for the Petroleum Release   From 1998‐2013, light non‐aqueous phase liquid containing PCP was removed from the Site.   Recovery methods included the use of petroleum absorbent socks, hand removal with a bailer, and  using a vacuum truck and/or peristaltic pump.       

  Page 2  May 2, 2016    Response Action Goals for Hazardous Substances   The primary human health pathway of concern at the Site was the potential exposure to contaminated  surface soils within the upper four feet below ground surface. As such, the Minnesota Decision  Document (MDD), dated March 31st, 2016, outlines the commercial Tier 2 Soil Reference Values (SRVs)  as reasonable and appropriate cleanup levels for the soil contamination based on the current land use  as of the MDD date.    The MDD concluded there were no drinking water supply wells identified near the Site, and the  groundwater contamination plume had not migrated off the Site. The lack of nearby sources of  private or public drinking water, combined with the limited size of the groundwater plume, indicated  potential human exposure to contaminated groundwater was low enough to support taking no  remedial actions for impacted groundwater at the Site.    Evaluation of Response Action Alternatives  The MPCA reviewed a Feasibility Evaluation report for the Site dated August 25th, 2014. This report  documented cleanup options for the hazardous substances at the Site. The MPCA agreed with the  report’s conclusion that excavation and offsite disposal of impacted surface soils would be feasible  for achieving Site remedial goals.    Contaminated Soil Removal  In December 2014, approximately 591 tons of contaminated surface soil was excavated and properly  disposed of as described in the MDD.  Soil samples collected from the sidewalls and base of the  excavation did not exceed the Commercial Tier 2 SRVs.    Institutional Controls  An Affidavit Concerning Real Property Contaminated with Hazardous Substances (Affidavit),  recorded with the St. Louis County Recorder’s Office on July 8, 2015 describes the location and  magnitude of remaining soil and groundwater contamination. The Affidavit also notes that the  completed response actions were based on industrial or commercial use, and that the MPCA should  be contacted for any use or activity impacting the protectiveness of the remedy.  

Page 3  May 2, 2016     

Conclusion  The Minnesota Decision Document (MDD), issued on March 31, 2016, presents the selected  remedial action and cleanup levels, as well as the response actions undertaken at the site.  Hazardous materials in exceedance of clean‐up levels in the soil were excavated from the site.  The  MPCA has determined that the selected response actions for the Site are protective of human  health, welfare, or the environment and that residual contaminants remaining in soil, groundwater,  and soil vapor no longer pose a threat to human health, welfare, or the environment from a release  or threatened release of the hazardous substance, or pollutant or contaminant.  MPCA staff  recommends that the Site be removed from the PLP.                                                       

Recommendation for Removal of Boyer Lumber from the PLP Memorandum ‐ Site Map   

 

ATTACHMENT 1 Boyer Lumber Superfund Site Minnesota Decision Document