HomeMy WebLinkAbout11-18-16 Correspondence - Montana DEQ to Commission - Bozeman Solvent Site Update Ii BOZEMAN SOLVENT SITE UPDATE
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BACKGROUND
The Bozeman Solvent Site(BSS) includes the Hastings Shopping Center (also called the Buttrey Shopping
Center) and extends north of the East Gallatin River(see below). The BSS is being addressed by the Montana
Department of Environmental Quality (DEQ) under the authority of the state Superfund law, CECRA. In
August 2011, DEQ issued the Record of Decision(ROD) which selected the final remedy to clean up ground-
water, saturated soils, and soil vapors contaminated with PCE and other chemicals.
The final remedy included land use controls, a controlled groundwater area(CGWA), sub-slab soil vapor
extraction(SVE), enhanced bioremediation(EB) for saturated soils and groundwater, monitored natural
attenuation for groundwater, and connection to city water and new or deeper replacement wells for impacted
drinking water wells. The City of Bozeman and CVS Pharmacy are responsible for the cleanup of the BSS.
Since the last update(June 2015)the following activities have occurred at the BSS:
• Second EB injection,which has greatly reduced contaminants near the source area(see figure on back).
• Connection of horizontal SVE wells to equipment sheds, and operation of both sets of horizontal wells.
• Continued operation and monitoring(O&M) of the horizontal SVE system to capture and treat vapors
during EB.
• Continued groundwater monitoring.
BSS Bo day
Con•]c">o Gamd W3*rArva Boundary I
1103 h 01�1 from Ourne)
Ga1�n�Flbb4:
East Gallatin
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td� But.my
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The green line represents the `+he BSS Controlled Groundwater Area and is the approximate boundary of the BSS.
However,the contaminat' ",-green line. *Figure 2 is in the Record of Decision MPQ 2011)and is available
at http://deq.mt.gov/f.
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BOZEMAN SOLVENT SITE UPDATE
WHAT'S NEXT?
Q NOA"ING WEIL
?sI,ANaWL.20t.RCE — — — — — -- - -- -
• Continued mon- 00fKT?4M1)N-W1_
—1n—HDAlARr214PCE — — ---
itoring for the CdNCEN,RAT,DN`DtaDUR
aS,�70s PCE
110N-VVt-
EB treatment SETi7l"2010 PCE
C04CEKMTK1IC0P0'oI,R
area. Kale AFwfassDns
Pal �
• Continued _ ,_ q_ Theatte
O&M for the
sub-slab SVE
systems. D® i� /� N
• Continued I
groundwater j i ,,
monitoring. \ s4
For more information,
please contact: THE TEPORTIPWILMITREFUCTS A RVE TILES DILLRION.TIE SAWLE WAS
DILUTED DLETO FOWNO.
Kate Fry w THE RBLMTINGL04TREFIECTSAQTILESDIUTION.THE SAWUWAS
FtegM ?� �UTED�TOSALFEVATMINTERFEFUMM.
Montana DEQ µ Da
1225 Cedar Street �3soeelow GROUNDWATER PCECONCENTRATHM -- a R
\ COMPARISON MAP " '�`'
' I-tastirgs Enterhin Tenth C. .UWIIM'(7Wl ATOSEPTElB6t 70/c n171.,nvnnun Nw
P.O.Box 200901 D07ETAMISDLVENTSIit ��TAfN,M oc.y,u,vus3 o so<e
tsozew.W qi nc}yqy�
Helena,MT 59601
(406)444-6426 The above figure shows the EB treatment area. The black line shows groundwater PCE concentrations in
January 2014. The red line shows PCE concentrations in September 2016(after the second EB injection).
DE � � T U.S.POSTAGE j>PITNEY BOWES
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Montana Department
of Environmental Dualit'"%, `
V I i
,�Es ZIP 59601 $ 000.465
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1 =. 0001398355NOV 18 2016
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Waste Management and Remediation Division
1225 Cedar Sheet
P.O. Box 200901
Helena,MT 59620-0901
BOZEMAN CITY COMMISSIONER
CITY OF BOZEMAN
PO BOX 1230
BOZEMAN MT 59771
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