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Golder Associates February 18, 2016 Project No.: 023-6105-016 Mr. A ndrew Nichols V oluntary Investigation & C leanup Program M innesota Pollution Control Agency 520 Lafayette Road St.

Railroad C om pany d/b/a Canadian Pacific (CP), this letter presents the results o f soil gas m onitoring in the form er W aste Reclam ation area at the Shoreham Yard (Site) in M inneapolis, M

2 Golder Associates February 18, 2016 Project No.: Mr. A ndrew Nichols V oluntary Investigation & C leanup Program M innesota Pollution Control Agency 520 Lafayette Road St. Paul, MN RE: SOIL GAS MONITORING FORMER WASTE RECLAMATION AREA EAST SIDE SHOREHAM YARD, MINNEAPOLIS, MN (VIC PROGRAM SITE ID VP5080) I SOO LINE (SR380) Dear Andrew: On behalf of Soo Line Railroad C om pany d/b/a Canadian Pacific (CP), this letter presents the results o f soil gas m onitoring in the form er W aste Reclam ation area at the Shoreham Yard (Site) in M inneapolis, M innesota. A s described in the approved W ork Plan for D ecom m issioning of the Soil V apor Extraction (SVE) system s, soil gas m onitoring locations SG B4-S/D and SGB6-S/D, w ere retained to m onitor soil vapor levels after SVE system decom m issioning activities w ere com pleted. (See the figure in A ttachm ent A for the m onitoring locations.) Each m onitoring location includes tw o sam ple ports at feet ( S designation) and feet ( D designation) below ground level. The soil gas m onitoring plan includes quarterly sam pling for volatile organic com pounds (VO C s) for two years after decom m issioning of the SVE system s. Soil gas results are to be com pared to 10x the M innesota Pollution C ontrol A gency (M PCA) com pound-specific, industrial intrusion screening values (10x ISVs). 1.0 SOIL GAS MONITORING RESULTS Following decom m issioning o f the SVE system s in N ovem ber 2014, quarterly soil gas sam pling com m enced in D ecem ber Results of the sam pling through June 2015 w ere provided to M PCA in a Septem ber 10, 2015 letter report, which recom m ended further m onitoring (consistent with the monitoring plan) to evaluate trends, including seasonality. Since the previous report, tw o additional quarterly sam pling events have been com pleted (S eptem ber and D ecem ber 2015). Results o f the sam pling to date are presented in the attached table, and com pared to 10x the current Industrial ISV screening values, including the m ost recent Interim ISVs published by MPCA. The table also includes results from the soil gas sam pling in N ovem ber 2013 follow ing shut down of the SVE system s but prior to decom m issioning. As shown in the table, all V O C results are less than 10x the ISV for locations SGB6-S and SG B6-D follow ing limited exceedances of the 10x screening levels occur in SGB4-S and SGB4-D: The 1,3-butadiene in SGB4-D in D ecem ber 2014 only. Trichloroethene (TCE) in SGB4-S and -D in Septem ber 2015 only Tetrachloroethene (PCE) in SGB4-S and -D g \pfoiecls\2002 proiecls \ cprvsoi) gas monitoring ipost-svehfeb 2016 letter rpl\fm al\posl-sve soil vapor momtonng doc«golder Associates Inc. 200 Century Parkway, Suite C Mt Laurel, NJ USA Tel; (856) Fax: (856) wwwgolder.com Golder Associates: Operations in Africa, Asia, Australasia, Europe, North America and South America Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporation

Mr. A ndrew Nichols M PCA 2 February 18, 2016 Project No. 023-6105-015 2.

Results from all sam ples collected follow ing repair of S G B4-D w ere non-detect for 1,3-butadiene.

3 Mr. A ndrew Nichols M PCA 2 February 18, 2016 Project No CONCLUSIONS / RECOMMENDATIONS The single exceedance fo r 1,3-butadiene in D ecem ber 2014 is anom alous and appears to have been caused by physical dam age to the m onitoring point. Results from all sam ples collected follow ing repair of S G B4-D w ere non-detect for 1,3-butadiene. TCE exceedances w ere limited to a single sam pling event (S eptem ber 2015) at a single location (SGB4) and m ay reflect seasonality. PCE exceedances also occur at the sam e locations (SGB4), but on a m ore frequent b a sis1 and again may reflect seasonality. The Septem ber 2015 results showed an increase in PCE and TCE concentrations com pared to earlier sam pling events in There was a noticeable decrease in PCE (and TCE) concentrations in the D ecem ber 2015 results com pared to Septem ber 2015, with concentrations consistent w ith the M arch/april 2015 and June 2015 sam pling results. Results at SGB4 m ay reflect seasonality and w arrant further monitoring. Soil vapor concentrations were higher during w arm er m onths, a trend that was also observed in the extracted vapor during SVE system operation. There are no buildings or other receptors in the vicinity, and therefore the current levels do not represent a concern. An updated sum m ary o f the soil gas m onitoring will be provided to M PCA following the next tw o sam pling events, anticipated to be com pleted in March and June If you have any questions, please do not hesitate to contact LeeAnn Thom as o f CP at or Steve Finn or David Buscem i o f G older at V ery truly yours, GOLDER ASSOCIATES INC. David N. Buscem i, P.E. Senior Engineer P. Stephen Finn, C. Eng. Principal DNB/PSF/bjb A ttachm ents cc: Allan Tim m, MPCA Jam es Vondracek, Ashland Inc. Shoreham Area A dvisory C om m ittee LeeAnn Thom as, CP A im ee Zack, CP Steve Helgen, Integral 1T h e M P C A 1 0 x in d u s tria l IS V w as lo w e re d fro m lo n g / n f o n a n in te n m b a s is in le a d in g to m a n y o f th e e x c e e d a n c e s. g \pro ecls \2002 projects \ cprtsoil gas m onitoring (post-sve)\fed 2016 letter rpt\fm al\post-sve soil vapor momtonng docx r Golder Associates

February 2016 Soil Gas Analytical Results Soil Vapor Sampling Canadian Pacific Shoreham Yard Facility 023-6105 Sample Name SG-B4-S SGB4-S Duplicate SGB4-S Duplicate SGB4-S Sample Date 11/21/2013

4 February 2016 Soil Gas Analytical Results Soil Vapor Sampling Canadian Pacific Shoreham Yard Facility Sample Name SG-B4-S SGB4-S Duplicate SGB4-S Duplicate SGB4-S Sample Date 11/21/ /19/ /19/2014 3/26/2015 3/26/2015 6/10/2015 Parameter Units MPCA Industrial 10X Intrusion Screening Value (1 Ox ISV) Result Result Result Result Result Result 1,1,1-Trichloroethane ug/m Dichloroethane ug/m ND ND 17 1,2,4-Trimethylbenzene ug/m ND ND ND ND ND 1,3,5-T rimethylbenzene ug/m ND ND ND ND ND 1.3-Butadiene ug/m ND ND ND 2.2,4-Trimethyl pentane ug/m3 NS 31 ND ND ND ND ND 2-Butanone (Methyl Ethyl Ketone) ug/m Hexanone ug/m3 NA ND 64 ND Propanol ug/m ND Ethyltoluene ug/m3 NA 19 ND ND ND ND ND 4-Methyl-2-pentanone ug/m ND ND ND ND ND Acetone ug/m Benzene ug/m ND ND ND ND ND Carbon Disulfide ug/m ND ND ND ND ND cis-1,2-dichloroethene ug/m ND ND 24 Cumene ug/m3 NS 4 8 ND ND ND ND ND Cyclohexane ug/m ND ND ND ND ND Ethanol ug/m Ethyl Benzene ug/m ND ND ND ND ND Freon 11 ug/m ND ND ND ND ND Freon 113 ug/m ND ND ND ND ND ND Freon 12 ug/m ND ND ND Heptane ug/m3 NA 36 ND ND ND ND ND Hexane ug/m ND ND 25 m.p-xylene ug/m ND ND 12 Methylene Chloride ug/m ND ND ND ND ND o-xylene ug/m ND ND ND ND ND Propyl benzene ug/m3 NS 5.8 ND ND ND ND ND Tetrachloroethene ug/m Tetrahydrofuran ug/m3 NA ND 7.1 ND ND ND ND Toluene ug/m ND ND 9.4 trans-1,2-dichloroethene ug/m ND ND ND ND Trichloroethene ug/m ND 49 Notes and Abbreviations. ND - not detected NA - no toxicity data available NS - no standard ug/m3 - micrograms per cubic meter MPCA Industrial ISV for Vapor Risk Evaluation accessed at URL ww.pca.state.m n.us/index.php/view-docum ent.htm l?gid=3163 MPCA Interim Industrial ISV for Vapor Risk Evaluation accessed at URL ww.pca.state.m n.us/w aste/cleanup guidance 1 Results greater than 10x MPCA Industrial ISV are shaded and bolded 2 Only compounds detected in at least one sample are shown Checked by RW 1/8/2016 G \PROJECTS\2002 Projects CPR'.Soil Gas Monitoring (Post-SVE)VFeb 2016 Leiter Rpt\Final\ 2016_02 Soil G as Table xlsx P a 9 e 1 o f 5 f i ^ G o l d c r Associates

5 February 2016 Soil Gas Analytical Results Soil Vapor Sampling Canadian Pacific Shoreham Yard Facility Parameter Units Sample Name Duplicate SGB4-S Duplicate SGB4-S Duplicate SG-B4-D Sample Date 6/10/2015 9/30/2015 9/30/ /21/ /21/ /21/2013 MPCA Industrial 10X Intrusion Screening Value (10x ISV) Result Result Result Result Result Result 1.1,1-Trichloroethane ug/m ,1-Dichloroethane ug/m ND ND ,2,4-T rimethylbenzene ug/m3 200 ND ND ND ND ND 6 1,3,5-Trimethylbenzene ug/m3 200 ND ND ND ND ND 1 6 1,3-Butadiene ug/m3 20 ND ND ND ,2.4-T rimethylpentane ug/m3 NS ND ND ND ND ND Butanone (Methyl Ethyl Ketone) ug/m Hexanone ug/m3 NA ND 2-Propanol ug/m ND 4-Ethyltoluene ug/m3 NA ND ND ND ND ND Methyl-2-pentanone ug/m ND ND ND ND ND 4 9 Acetone ug/m Benzene ug/m3 130 ND ND ND ND ND 2.5 Carbon Disulfide ug/m ND ND ND ND ND ND cis-1,2-dichloroethene ug/m Cumene ug/m3 NS ND ND ND ND ND 0 76 Cyclohexane ug/m ND ND ND ND ND 2 3 Ethanol ug/m Ethyl Benzene ug/m ND ND ND ND ND 6.6 Freon 11 ug/m ND ND ND ND ND 1 Freon 113 ug/m ND ND ND ND ND ND Freon 12 ug/m ND ND ND Heptane ug/m3 NA ND ND ND Hexane ug/m m.p-xylene ug/m ND ND ND ND ND 21 Methylene Chloride ug/m3 600 ND ND ND ND ND 1.1 o-xylene ug/m ND ND ND ND ND 7 1 Propylbenzene ug/m3 NS ND ND ND ND ND 1.5 Tetrachloroethene ug/m Tetrahydrofuran ug/m3 NA ND ND ND ND ND ND Toluene ug/m ND ND ND ND ND 24 trans-1,2-dichloroethene ug/m ND ND ND T richloroethene ug/m Notes and Abbreviations: ND - not detected NA - no toxicity data available NS - no standard ug/m3 - micrograms per cubic meter MPCA Industrial ISV for Vapor Risk Evaluation accessed at URL n.us/index.php/view-docum ent.htm l7gid =3163 MPCA Interim Industrial ISV for Vapor Risk Evaluation accessed at URL n.us/waste/cleanup-guidance 1 Results greater than 10x MPCA Industrial ISV are shaded and bolded 2 Only compounds detected in at least one sample are shown Checked by RW 1/8/2016 G \PROJECTS\2002 Pro ects\ s CPR ISoil G as M onitoring (Post-SVE)\Feb 2016 Letter RptlFm alt 2016_02 Soil G as Table xlsx Pa9e 2 of 5 ( Ä * G o l d c r Associates

February 2016 Soil Gas Analytical Results Soil Vapor Sampling Canadian Pacific Shoreham Yard Facility 023-6105 Parameter Units Sample Name SGB4-D SGB4-D Duplicate-2 SGB4-D SGB4-D SGB4-D Sample Date

6 February 2016 Soil Gas Analytical Results Soil Vapor Sampling Canadian Pacific Shoreham Yard Facility Parameter Units Sample Name SGB4-D SGB4-D Duplicate-2 SGB4-D SGB4-D SGB4-D Sample Date 12/19/2014 4/17/2015 4/17/2015 6/10/2015 9/30/ /21/2015 MPCA Industrial 10X Intrusion Screening Value (1 Ox ISV) Result Result Result Result Result Result 1,1,1-Trichloroethane ug/m Dichloroethane ug/m ND ,2,4-Trimethylbenzene ug/m3 200 ND ND ND 4.9 ND ND 1,3,5-T rimethylbenzene ug/m3 200 ND ND ND ND ND ND 1,3-Butadiene ug/m ND ND ND ND ND 2.2,4-Trimethylpentane ug/m3 NS ND ND ND ND ND ND 2-Butanone (Methyl Ethyl Ketone) ug/m ND ND Hexanone ug/m3 NA 410 ND ND ND ND ND 2-Propanol ug/m ND ND 33 ND 15 4-Ethyltoluene ug/m3 NA ND ND ND 5.3 ND ND 4-Methyl-2-pentanone ug/m ND ND ND ND ND ND Acetone ug/m Benzene ug/m3 130 ND ND ND ND ND ND Carbon Disulfide ug/m ND ND ND ND ND ND cis-1,2-dichloroethene ug/m ND Cumene ug/m3 NS ND ND ND ND ND ND Cyclohexane ug/m ND ND ND ND Ethanol ug/m Ethyl Benzene ug/m ND ND ND 17 ND ND Freon 11 ug/m ND ND ND ND ND ND Freon 113 ug/m ND ND ND ND ND ND Freon 12 ug/m ND ND ND ND Heptane ug/m3 NA ND ND ND ND ND ND Hexane ug/m ND ND ND ND ND ND m.p-xylene ug/m ND ND ND Methylene Chloride ug/m3 600 ND ND ND ND ND ND o-xylene ug/m ND ND ND 17 ND ND Propyl benzene C 1 CO NS ND ND ND ND ND ND Tetrachloroethene ug/m Tetrahydrofuran ug/m3 NA ND ND ND ND ND ND Toluene ug/m ND ND trans-1,2-dichloroethene ug/m ND ND ND T richloroethene ug/m3 60 ND Notes and Abbreviations ND - not detected NA - no toxicity data available NS - no standard ug/m3 - micrograms per cubic meter MPCA Industrial ISV for Vapor Risk Evaluation accessed at URL ww.pca.state.m n.us/index.php/view-docum ent.htm l?gid=3163 MPCA Interim Industrial ISV for Vapor Risk Evaluation accessed at URL n.us/waste/cleanup-euidance 1 Results greater than 10x MPCA Industrial ISV are shaded and bolded 2 Only compounds detected in at least one sample are shown. Checked by RW 1/8/2016 G \PROJECTS\2002 Projects\ CPR\Soil G as Monitoring (Post-SVE)\Feb 2016 Letter Rpt\Final\ 2016_02 Soil Gas Table xlsx Pa9e 3 of 5 ( 3 S?*Goldcr \ L S Associates

7 February 2016 Soil Gas Analytical Results Soil Vapor Sampling Canadian Pacific Shoreham Yard Facility Parameter Units Sample Name SG-B6-S SGB6-S SGB6-S SGB6-S SGB6-S SGB6-S Sample Date 11/21/ /19/2014 3/26/2015 6/10/2015 9/30/ /21/2015 MPCA Industnal 10X Intrusion Screening Value (10x ISV) Result Result Result Result Result Result 1,1,1-Trichloroethane ug/m Dichloroethane ug/m ND ND ND ND ND ND 1,2,4-Trimethylbenzene ug/m3 200 ND ND ND ,3,5-Tnmethylbenzene ug/m3 200 ND ND ND ND ,3-Butadiene ug/m ND ND ND ND 2.2 2,2,4-Trimethylpentane ug/m3 NS ND ND ND ND ND ND 2-Butanone (Methyl Ethyl Ketone) ug/m ND Hexanone ug/m3 NA ND ND ND Propanol ug/m ND ND 44 ND Ethyltoluene ug/m3 NA ND ND ND Methyl-2-pentanone ug/m ND ND ND ND ND ND Acetone ug/m Benzene ug/m ND ND ND ND ND Carbon Disulfide ug/m ND ND ND ND ND ND cis-1,2-dichloroethene ug/m ND ND ND ND ND ND Cumene ug/m3 NS ND ND ND ND ND ND Cyclohexane ug/m ND ND ND ND ND Ethanol ug/m ND Ethyl Benzene ug/m ND ND ND ND Freon 11 ug/m ND ND ND ND 1 4 Freon 113 ug/m ND ND ND ND ND 1 5 Freon 12 ug/m ND ND ND ND 2.7 Heptane ug/m3 NA ND ND ND ND ND 2 4 Hexane ug/m ND ND m.p-xylene ug/m ND Methylene Chloride ug/m3 600 ND ND ND ND ND ND o-xylene ug/m ND ND ND Propyl benzene ug/m3 NS ND ND ND ND ND ND Tetrachloroethene ug/m Tetrahydrofuran ug/m3 NA ND ND ND ND ND ND Toluene ug/m trans-1,2-dichloroethene ug/m ND ND ND ND ND ND Trichloroethene ug/m3 60 ND ND ND ND ND ND Notes and Abbreviations: ND - not detected NA - no toxicity data available NS - no standard ug/m3 - micrograms per cubic meter MPCA Industrial ISV for Vapor Risk Evaluation accessed at URL ww.pca.state.m n.us/index.php/view-docum ent.htm lpgid-3163 MPCA Interim Industrial ISV for Vapor Risk Evaluation accessed at URL n.us/waste/cleanup-guidance 1 Results greater than 10x MPCA Industrial ISV are shaded and bolded 2 Only compounds detected in at least one sample are shown Checked by RW 1/8/2016 G \PROJEC TS\2002 Projectsv C P R 'S oil G as M onitoring (Post-SVE)\Feb 2016 Letter RptVFmaL Soil Gas Table xlsx Pa9S A of 5 f i ^ G o l d c r Associates

8 February 2016 Soil Gas Analytical Results Soil Vapor Sampling Canadian Pacific Shoreham Yard Facility Parameter Units Sample Name SG-B6-D SGB6-D SGB6-D SGB6-D SGB6-D SGB6-D Sample Date 11/21/ /19/2014 3/26/2015 6/10/2015 9/30/ /21/2015 MPCA Industrial 10X Intrusion Screening Value (10x ISV) Result Result Result Result Result Result 1.1,1-Trichloroethane ug/m ,1-Dichloroethane ug/m ND ND ND ND ND ND 1,2,4-Trimethylbenzene ug/m ND ND ND ND ND 1,3.5-Trimethylbenzene ug/m ND ND ND ND ND 1,3-Butadiene ug/m ND ND ND ,4-Trimethylpentane ug/m3 NS ND ND ND ND ND ND 2-Butanone (Methyl Ethyl Ketone) ug/m Hexanone ug/m3 NA ND 20 ND Propanol ug/m ND Ethyltoluene ug/m3 NA 5.6 ND ND ND ND ND 4-Methyl-2-pentanone ug/m ND ND ND ND ND ND Acetone ug/m Benzene ug/m ND ND ND ND ND Carbon Disulfide ug/m ND ND ND ND ND ND cis-1,2-dichloroethene ug/m ND ND ND ND ND ND Cumene ug/m3 NS ND ND ND ND ND ND Cyclohexane ug/m ND ND ND ND ND Ethanol ug/m ND Ethyl Benzene ug/m ND ND ND ND ND Freon 11 ug/m ND ND ND ND 1 4 Freon 113 ug/m ND ND ND ND ND 1.5 Freon 12 ug/m ND ND ND ND 2.7 Heptane ug/m3 NA 2.8 ND ND ND ND 3.9 Hexane ug/m ND ND m.p-xylene ug/m ND ND ND ND ND Methylene Chlonde ug/m3 600 ND ND ND ND ND ND o-xylene ug/m ND ND ND ND ND Propylbenzene ug/m3 NS 1.4 ND ND ND ND ND Tetrachloroethene ug/m Tetrahydrofuran ug/m3 NA ND ND ND ND ND ND Toluene ug/m ND ND ND ND ND trans-1,2-dichloroethene ug/m ND ND ND ND ND ND Trichloroethene ug/m3 60 ND ND ND ND ND ND Notes and Abbreviations: N D -n o t detected NA - no toxicity data available NS - no standard ug/m3 - micrograms per cubic meter MPCA Industrial ISV for Vapor Risk Evaluation accessed at URL n.us/index.pho/view-docum ent.htm l?gid=3163 MPCA Interim Industnal ISV for Vapor Risk Evaluation accessed at URL ww.pca.state.m n.us/w aste/deanup-guidance 1 Results greater than 10x MPCA Industrial ISV are shaded and bolded 2. Only compounds detected in at least one sample are shown Checked by RW 1/8/2016 G \PROJECTS\2002 Projects\ CPRtSoil G as Monitoring (Posl-SVE)\Feb 2016 Letter Rpl'Fmal. 2016_02 Soil Gas Table xlsx P a9 e 5 o f 5 ( 3 ) * Colder A ssociates

9 ATTACHMENT A FORMER SVE SYSTEMS LAYOUT (SOIL RESPONSE ACTION COMPLETION REPORT, JUNE 30, 2015)

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$UNK fencc - REMOVED SHAUCW SOIL GAS BCRiMG (SGB) J»TO N (SEE REFERENCE *) DEEP SO'L GAS BORING (SGB) LOCATION (SEE REFERENCE 4) CARBON - TESSEIS ÆW05 SO-CT2 ROUND HOUSE AREA I VPt fc 9b- VE\V0B-43-$

10 SHOPS AREA APPROXIMATE ÜfcNÎ Of SOU EXCAVAIICK (SEE NOTE 5) **06-40 CONCRETE rtoop sla [ÉG85-S r rv WB«-W- EACllirr BOUHOAR-r RAILROAD TRACKS Sff SY^IEM PIPING (ABOVE GRADE) - REMOVED SVE SYSItM PIPING (»LOW CRADt) - REMOVED fvz«.ble (TbC*) HOSE - REMOVED I'LL SVE WtU - DrCOUUiSSiONED ALLUVIUM SVE WEd. - DECOMMISSIONED 10-L MOM 10*1*0 T O «- OCCOUMISS OnED ALLU.'DW Mt>N!ICKISG PROBE DECOMUISSCNED SVC SrSTLM ENClOSUR:- - DFCOMU.-SSONFD SVE VALVE HOUSE - DECOMMISSIONED FIXED PtPfc $U**K)KI - HfMOVATT HEAT EXCHANGER REMOVED CARBON VESSEL - REMOVED CHAtt. UNK fencc - REMOVED SHAUCW SOIL GAS BCRiMG (SGB) J»TO N (SEE REFERENCE *) DEEP SO'L GAS BORING (SGB) LOCATION (SEE REFERENCE 4) CARBON - TESSEIS ÆW05 SO-CT2 ROUND HOUSE AREA I VPt fc 9b- VE\V0B-43- V:;WCS- REFERENCES VE*Dfi-3D-UAJ t / ' VE*05 S3 VLW36 S6 CTO ^ scm-o f sue'-s FORMER WASTE RECLAMATION AREA rvc*os-sa-ct ve'*0ô-«*-cavj VEWOS 47 C*fl CJt'STihO COWÄE: FLOCS Ï SOO LIN E S H O R LH A M LAC1LITY M INNEAPOLIS, M IN N L S O IA FORMER SVE SYSTEMS LAYOUT G older 'Associates FIGURE 2

CERTIFICATE OF ACCREDITATION

CERTIFICATE OF ACCREDITATION ANSI-ASQ National Accreditation Board/ACLASS 500 Montgomery Street, Suite 625, Alexandria, VA 22314, 877-344-3044 This is to certify that Eurofins Toxics, Inc. 180 Blue Ravine