Wells G&H Superfund Site Southwest Properties (SWP), OU4 July 13, 2017 Agenda: • Proposed Cleanup Plan for Public Review & Comment • Overview of SWP Contamination, Transport and Risk • Proposed Cleanup Plan Process • Cleanup Alternatives & Preferred Cleanup Plan • 30 Day Public Comment Period (7/14/17 thru 8/14/17) • Questions? EPA Project Manager: Joseph LeMay, P.E. (617) 918-1323 [email protected]
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Wells G&H Superfund Site Southwest Properties (SWP), OU4 July … · 2020-04-02 · Wells G&H Superfund Site Southwest Properties (SWP), OU4 July 13, 2017 . Agenda: • Proposed Cleanup
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Wells G&H Superfund Site Southwest Properties (SWP), OU4 July 13, 2017 Agenda: • Proposed Cleanup Plan for Public Review & Comment • Overview of SWP Contamination, Transport and Risk • Proposed Cleanup Plan Process • Cleanup Alternatives & Preferred Cleanup Plan • 30 Day Public Comment Period (7/14/17 thru 8/14/17) • Questions?
EPA Project Manager: Joseph LeMay, P.E. (617) 918-1323 [email protected]
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"'"" (1) Excavatron a."N& to tie ~ea as part d ~ rtvKGgltlon. (2) NA?l prochlCt or glOOUleS ~ r.oatrng In l'OOf'i.:ortng v,--ei:15 [J) -'4)proX!l'l\T.~ 2 rw, d&OI remo-.'ed as pa,tOf MlrPflY SM-Janmatt.-e (4) Whitney NA.PL area te!TIO'o-ea a$ pa,t or 'MV!ney S'N-3 ar.:ma:-;e
WEUS G& H OOUTHW'EST PROPERTIES
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~ 1~$-14 C~E'PT\..W. Pl.AN FOR NAPL
M.TE.:;;."1\TI\IE IH
NAPL Impacts
• Bedrock Well CJ Bedrock ExoeedYloes (Dashed 'Mlere lnmed) • lotarnedate'Deep \'li'eU CJlntamedate Exoeedances • Shallow WeU CJSh..lllow Exceedanoes
FlJTl.JRE S H~J.J..0'1/ GRO DWAlER RISK TO C<mSTRUCTION \l'ORKER
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PROPEFm' LINE
sm EAM OR RIVER
'1/ CTLANCI BOUNDARY
Shallow Groundwater Risk
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'.ill~I ITNEY BARREL PROPERTY ABER.JONA AUTO PARTS l"ROPERTY
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FVTURE EDl!!El<T RISK 10 n ESP,o.SSIJR AND REOREATIO AL \llSITOR
PROPERTY LINE
SlREAM ~ · F!IVEI'!
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Wetland Sediment/Soil Risk
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Presenter
Presentation Notes
n FU RE SQIL RISK 1•()
. S~ UCTlON \\'ORKER
WHITNIEY BARREL PROP ERTY ABERJONA AUTO PARTS PROPERTY
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PROPEF!lY LINE:
STREAM OR RI\ID?
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Soil Risk
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Presenter
Presentation Notes
egend
- wetland
-- Bolding
F•nce
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--P,q,e<tyLine
-- Road -+-+- Raik'o3d
------ Streams
AECOM
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WILDWOOD PROPERTY
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A5ERJONA AlJTOF¥.RTS PROP-ERTY 280SalanSt
120 , .. , WEUSG&H SOUTHWEST PROPERTIES
WOBURN. MA
OATE: 2/24.'2015 D."lWN:J.E.8. PROJECT 60312288
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• LEGEND Representative VOCs
Co-Cio •
Cu-Ctt
Naphthalene •
0 TCE
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• For ne ~ voe w.. exceeoanCK no; rroppeo are naprrJ\aiene ai MI.Qhy ana ~ 10 a1 wtir.ney ana Murpny. rnese are generally 51nila to or wrnn arN& &hOWn t>r Cu¼
see T.ltlle 3 tir 116.:& 01 an voe ana app,ca01e pe1r01eum tracoon INCl'llng e.xceeaa'leff oy --f OO!pflnt6 d $011 leactllng PRG exc.eecl31"1Ce$
are Oa&ed on 2011/2013 ~ter resu:15 en:.eea:ng me propo&e(I 9f"Ol.l'IOA'alff PRG6.
Figure 1 - Soil Areas Exceeding the Proposed Soil Leaching PRGs
FS Soil Leaching Model
Feasibility Study - Nine Criteria • Overall protection of human health and the environment • Compliance with Applicable or Relevant and Appropriate
Requirements (ARARs) • Long-term effectiveness and permanence • Reduction of toxicity, mobility or volume through treatment • Short-term effectiveness • Implementability • Cost • State acceptance • Community acceptance
(1) Exe.wattoe'I .n-a, to tiermeo as pan ot l)C'e<lKISJ'I WlYKdgJ!lon. ('2) NA?t proauct or 91oouie, 01)61:Ned tloal:fng 1n toori'lOl'!ng w.115 [J) -'4)proXlma::I)' 2:ee; ot&OI ten'IO\'ed as p.lltot Mtrpl'ly SM-3anana1to<e (4) \'Vnltney NA.PL area remo-.-ea as pa,t or 1A'111ney s•N-J ar.:n a:.ve-
\'VfUS G&H SOUTHW'EST PROPERTIES
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: 1~1 CONCE:.=TI..W. ~ FOR NAPL
AI.TE:.o;;N,\TI\IE IH
EPA Proposed NAPL Alternative: N-3
-3 - Monitored Natural GW-4 - In Situ Biologica l GW-5 - In Situ Chemica l Nine Criteria GW-2 - Institutional Attenuation and Inst itut ional Treatment and Institut ional Oxidation and Inst itut ional GW-6 - Pump and Treat and
GW-1 - No Action Controls Controls Contro ls Controls Institutional Controls
Protects Human Health and the D D D 00 00 00 Environment
Meets Federal & State D D D 00 00 00 Requirements
Provides Long-Term Protection D D D 0 0 00 Reduces Mobility, Toxicity &
• Tota l Cost $0.05 $1.5 $7.1 $27.0 $4.2 State Agency Acceptance To be determined after public comment period Community Acceptance To be determined after public comment period
Groundwater Alternatives
es
1. Plume boundaries defined as where one or more VOCs exceed PRGs. Source removal is assumed ,;is shown.
2.AreasofVOCsimpact.;ibove PRGsare approximate b.;ised on data from existing monitoring well network. The lateral .;ind vertical extent of these ,;ireas will be refaned during pre-design investig.a:ion.
3. Preliminary extraction well ne~work design by EPA 4. Predesign investigation to define tteatment areas
for .;ill COCs. 5. Final extraction well n&tWork to be detennined based
Targeted Deeper Excavation, Nine Criteria Off-Site Disposal, Amended
WTL-2 - Monitored WTL-3 - Capping, Wetland Cap, Wetland Restorat ion, WTL-5 - Deep Excavation and
Natural Recovery and M it igation, Monitoring and Monitoring and Institutional Off-Site Disposal, Backfill, and WTL-1 - No Action Institut ional Cont rols Institutional Cont rols Cont rols Wetland Restoration
Protects Human Health and the D D 00 00 00 Environment
Meets Federal & State D D D 00 00 Requirements
Provides Long-Term Protection D D 0 0 00 Reduces Mobility, Toxicity &