Memorandum - Real Estate Office · Memorandum Subject: Summary of ... The U.S. Air Force/Navy leased a portion of the Phase 1 Residential Development Area and constructed ... s S

Barr Engineering Co. 4300 MarketPointe Drive, Suite 200, Minneapolis, MN 55435 952.832.2600 www.barr.com

Memorandum

Subject: Summary of Environmental Conditions

Phase 1 Residential Development Area, UMore Park

Dakota County, Minnesota

Date: September 15, 2017

This memorandum describes the past use and environmental investigation results of the Phase 1

Residential Development Area (435.546 acres at the University of Minnesota Outreach, Research and

Education (UMore) Park in Dakota County, Minnesota (Figure 1). UMore Park includes portions of the

former Gopher Ordnance Works (GOW), which was constructed and operated from 1942 to 1945 by E.I.

du Pont de Nemours (as a contractor for the U.S. Government) for the manufacture of smokeless

gunpowder (i.e., nitrocellulose), oleum (an intermediate used in the manufacture of sulfuric acid), and

nitric acid for the World War II effort. After the war ended, the GOW was decommissioned and acquired

by the University for research, agriculture, and third party tenant uses.

The environmental conditions at UMore Park, including the UMore Mining Area (UMA) and the UMore

East subarea (Figure 2), have been the subject of numerous investigations by the University, U.S. Army

Corps of Engineers (USACE), and others since 2002 and a Public Health Assessment (MDH, 2014). These

investigations, which were conducted with oversight by the Minnesota Pollution Control Agency (MPCA),

have included record reviews, site reconnaissance, and environmental sampling and analysis to better

understand past site use and to characterize soil and groundwater quality. Investigation work plans,

reports, and other information regarding past use and environmental conditions at the Phase 1

Residential Development Area and UMore Park are available at the UMore Park online document

repository: http://www.umorepark.umn.edu/ planning/gowinvestigation/repository/index.htm

Previous Phase I ESAs

Phase I Environmental Site Assessments (ESAs) were completed for UMore Park by Peer Engineering (Peer,

2006) and for the UMore East subarea by Barr Engineering Co. (Barr, 2011) to identify recognized

environmental conditions (RECs). The Phase I ESAs were performed in conformance with ASTM,

International (ASTM) Practice E 1527-05.

The following RECs were identified in the Phase 1 Residential Development Area (Barr, 2011):

Potential presence of asbestos containing building materials on the ground near GOW

structures/former GOW buildings.

Documented releases associated with the GOW construction, use, or decommissioning/

demolition activities associated with the GOW rail lines.

Subject: Summary of Environmental Conditions, Phase 1 Residential Development Area, UMore Park

Date: September 15, 2017

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Potential releases associated with the GOW construction, use, or decommissioning/demolition

activities associated with the partially constructed GOW aniline plant.

Figure 3 shows the Phase 1 Residential Development Area at the time of the GOW decommissioning in

1945. Prior to the construction of the GOW, the Phase 1 Residential Development Area included three

farmsteads and was used for agricultural use. During GOW operations, the western portion of the Phase 1

Residential Development Area served largely as buffer property around the GOW and was intersected by

rail lines and access roads. The southeast portion of the Phase 1 Residential Development Area was the

planned location of the GOW Aniline Plant that was partially constructed but reportedly cancelled before

construction was completed. Additional support areas within the Phase 1 Residential Development Area

included the GOW Parking Lot, GOW Guard Towers, a temporary garage, and a safety office (Figure 3).

After the GOW was decommissioned, the University used the Phase 1 Residential Development Area for

agriculture and research and leased portions for tenant use (Figure 4). The University Beef Facility was

formerly located in the Phase 1 Residential Development Area and was used to board cattle for research.

The U.S. Air Force/Navy leased a portion of the Phase 1 Residential Development Area and constructed

the Navy barracks. The Jensen Air Field included a grass airplane landing strip and airplane

hangar/storage buildings. Two small plane crashes (Sites A and B on Figure 4) reportedly occurred north

of the air strip (Barr, 2011). In 2014, a haul road was constructed on the former GOW rail line to support

the gravel mining operations in the northern portion of the UMA.

Previous Environmental Investigations

The soil sampling locations from previous environmental investigations at the Phase 1 Residential

Development Area are shown on Figure 4 and the analytical results are included in previously published

reports (Barr, 2009a, 2009b, 2012, 2013, and 2017; Versar, 2010). Areas of known or suspected

environmental impacts at UMore Park are shown on Figure 5.

The findings from past investigations conducted in the Phase 1 Residential Development Area are

discussed below.

GOW Rail Line/UMA North Haul Road

Nine surface soil samples were collected along the former GOW railroad as part of the Phase II

Investigation of Sites of Concern (SOCs) 1-3 and 6-8 in the UMA (Figure 4; Barr, 2009). The samples were

analyzed for semi-volatile organic compounds (SVOCs), metals, and volatile organic compounds (VOCs).

Soil samples were also collected from two soil borings near the former GOW rail line and analyzed for

metals, VOCs, pesticides, and nitrocellulose. No analytes were detected above the Minnesota Pollution

Control Agency (MPCA) Tier 1 Soil Reference Values (SRVs) for unrestricted land use except for

benzo(a)pyrene equivalents (B(a)Pe), which exceeded Tier 1 SRVs in one surface soil sample.

Subject: Summary of Environmental Conditions, Phase 1 Residential Development Area, UMore Park

Date: September 15, 2017

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A follow-up investigation was conducted along the railroad track in the area where the B(a)Pe exceeded

Tier 1 SRVs (Barr, 2013). An additional 16 soil samples were collected and analyzed for SVOCs. No analytes

were detected above the Tier 1 SRVs.

Navy Barracks

A total of 31 soil samples were collected at the former Navy Barracks as part of the Environmental

Baseline Survey (Figure 4; Versar, 2010). The samples were analyzed for PCBs and one sample was

analyzed for metals and PAHs. PCB-impacted concrete, asphalt, and shallow soil were identified, removed,

and disposed offsite (Versar, 2010). Samples collected from the base of the excavation were below Tier 1

SRVs for PCBs (Versar, 2010).

GOW Aniline Plant

Four surface soil samples were collected in the planned GOW aniline plant as part of the UMore East

Remedial Investigation (Figure 4; Barr, 2012). The samples were collected from test trenches excavated

near/below partially constructed buildings intended for chemical storage or in areas of potential

disposals. The samples were analyzed for SVOCs and metals. No analytes were detected above the Tier 1

SRVs for unrestricted land use (Barr, 2012).

Groundwater and Soil Gas

Groundwater samples have been collected from soil borings and monitoring wells installed at UMore Park

as part of past investigations and in conjunction with the UMA gravel mining operation. There are no

releases to groundwater or soil gas under investigation.

References

Barr Engineering, 2009a. Phase II Investigation Report, Sites of Concern 1-3 and 6-8, UMore Mining Area,

Dakota County, Minnesota.

Barr Engineering, 2009b. Memorandum: Limited Phase II Site Investigation, UMore Park Proposed Ball

Fields Property.

Barr Engineering, 2011. Phase I Environmental Site Assessment, UMore East, Dakota County, Minnesota.

Barr Engineering, 2012. Remedial Investigation Report, UMore East, Dakota County, Minnesota.

Barr Engineering, 2013, Technical Memorandum: Phase II Investigation, North Haul Road, UMore Mining

Area, Dakota County, MN.

Barr Engineering, 2017. Remedial Investigation Report, UMore Park/Former Gopher Ordnance Works,

Dakota County, Minnesota.

Minnesota Department of Health, 2014. Draft Public Health Assessment, Former Gopher Ordnance Works,

Rosemount, Dakota County, Minnesota. September 24, 2014.

Peer Engineering, 2006. Phase I Environmental Site Assessment, UMore Park, Rosemount, Minnesota.

USACE, 2009. Final Expanded Site Inspection Report, Former Gopher Ordnance Works, Rosemount,

Minnesota.

Subject: Summary of Environmental Conditions, Phase 1 Residential Development Area, UMore Park

Date: September 15, 2017

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Versar, 2010. Environmental Baseline Survey, Naval Intelligence Reserve Command, 14950 Akron Avenue,

Rosemount, Minnesota.

Encl.

Figure 1 - Phase 1 Residential Development Area Location

Figure 2 – UMore Park/Gopher Ordnance Works Subareas

Figure 3 – Historic Layout – 1945

Figure 4 – Post-GOW Layout and Sample Locations

Figure 5 – Areas with Known or Suspected Impacts

Figures

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Figure 1PHASE 1 RESIDENTIALDEVELOPMENT AREA

Phase 1 Residential Development AreaDakota County, MN

UMore ParkPhase 1 Residential Development Area

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Figure 2U MORE PARK / GOPHER ORDNANCE

WORKS SU BAREASPhase 1 Residential Developm ent Area

Dakota County, MN

Data Sources: Barr Engineering Com pany, U niversity of Minnesota, Dak ota County.Background: Pictom etry International 2016 Courtesy ofDakota County.

Phase 1 Residential Developm ent AreaU More ParkU More East AreaU More Mining Area

Copy right 1990 – 2011 by Dak ota County. All rights reserved. No partof this Data Base m ay be copied, reproduced, or transm itted in anyform or by any m eans whether graphic, electronic, or m echanical,including photocopy ing, recording, or by an inform ation storage andretrieval sy stem , w ithout written perm ission from Dakota County.

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SOC1 - FORMER "Y" RAILROAD GOW RAIL LINE

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Figure 3HISTORIC LAYOUT - 1945

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Da ta Source s: Ba rr Engine e ring Com pa ny, Unive rsity of Minne sota , Da kota County.Background : 1945 Ma rkhurd a e ria l photos photos obta ine d from Ae ro-Me tric Inc.

P ha se 1 Re sid e ntia l De ve lopm e nt Are aP re -GOW Fa rm ste a d (Da kota Co.)

Copyright 1990 – 2011 by Da kota County. All rights re se rve d . No pa rtof this Da ta Ba se m a y be copie d , re prod uce d , or tra nsm itte d in a nyform or by a ny m e a ns whe the r gra phic, e le ctronic, or m e cha nica l,includ ing photocopying, record ing, or by a n inform a tion stora ge a ndre trie va l syste m , without writte n pe rm ission from Da kota County.

Bld # Building Name41-T Safety Office44-T Truck Scale House197-T Garage208-T Receiving Warehouse211-T Oil Warehouse212-T Cement Shed236-T Filling Station

614-26 Guard Tower614-52 Guard Tower707-GG Organics Change House722-M Organics Area Shop746-C Field Canteen903-A Benzene Nitrating House904-A Separating and Neutralizing House906-A Still House907-A Reducing House908-A Iron Storage909-A Aniline Storage910-A Autoclave Charge House915-A Fuel Oil Storage921-A Organics Raw Material Store House924-A Car Spot

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U.S. AIR FORCE / NAVYLEASE AREA(APPROXIMATE)

GOW ANILINE PLANT

GOW RAIL LINE/UMA NORTH HAUL ROADSOC1 - FORMER "Y" RAILROAD

UNIVERSITY BEEFFACILITY (NORTH)

PLANE CRASH SITE APLANE CRASH SITE BNAVY BARRACKS

JENSEN AIRFIELD (FORMER)

145th St W145th St E

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Fig u re 4POS T-GOW LAYOUT AND S AMPLE

LOCATIONSPhase 1 Re side ntia l De ve lopm e nt Are a

Da kota Cou nty, MN

*Ye llow sym b ols indica te loc a tions of soil sa m ple s with conce ntra tionsle ss tha n Tie r I Re side ntia l S RVs (MPCA, 2009)*Re d sym b ols indica te loc a tions of soil sa m ple s with Tie r I Re side ntia lS RV e xce e da nc e s for constitu e nts of conc e rn.Da ta S ou rc e s: Ba rr Eng ine e ring Com pa ny, Unive rsity of Minne sota, Da kota Cou nty.Ba ckg rou nd: Pictom e try Inte rna tiona l 2016 Cou rte sy ofDa kota Cou nty.

Phase 1 Re side ntia l De ve lopm e nt Are a!( S a m ple Loca tion

Copyrig ht 1990 – 2011 by Da kota Cou nty. All rig hts re se rve d. No pa rtof this Da ta Base m a y b e copie d, re produ c e d, or tra nsm itte d in a nyform or by a ny m e a ns whe the r g ra phic, e le ctronic, or m e cha nica l,inclu ding photocopying , re cording , or by a n inform a tion stora g e a ndre trie va l syste m , withou t writte n pe rm ission from Da kota Cou nty.

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Fig ure 5AREAS WITH KNOWN ORS US PECTED IMPACTS

Ph ase 1 Residential Developm ent AreaDak ota County, MN

Note: Isolated identified releases are present at the site outside of thehatched area. S ee h ttp://w w w .um orepark .um n.edu/planning /g ow investig ation/repository/index.h tm for m ore inform ation.Data S ources: Barr Eng ineering Com pany, University of Minnesota, Dak ota County.Back g round: Pictom etry International 2016 Courtesy ofDak ota County.

Phase 1 Residential Developm ent AreaUMore ParkUMore East AreaUMore Mining AreaKnow n or S uspected Im pacts

Copyrig h t 1990 – 2011 by Dak ota County. All rig h ts reserved. No partof th is Data Base may be copied, reproduced, or transm itted in anyform or by any m eans w h eth er g raph ic, electronic, or m echanical,including ph otocopying , recording , or by an inform ation storag e andretrieval system , w ith out w ritten perm ission from Dak ota County.

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