435.36 federal facility agreement and consent … · ou 10-08 soil screening level or have decayed...

435.36 05/12/2014 Rev. 14 Use with MCP-3480 Site Title:

FEDERAL FACILITY AGREEMENT AND CONSENT ORDER (FFA/CO) NEW SITE IDENTIFICATION (NSI)

I Site Code: TSF-61 V-Tanks and TAN-607 Soil Contamination Area I Document Number: NSl-26012

PARTS

1. Data Analysis and Risk Assessment: Post-remediation sampling within the Test Area North (TAN) V-Tanks area and former Buildings TAN-607 and -607A (TAN Hot Shop Facility) was compiled in a Post-Remediation Risk Evaluation and Data Summary Report (EDF-6686). The analysis combined and evaluated sample data collected under the Operable Unit (OU) 1-1 O remedial action for the V-Tanks and the TAN Hot Shop Faci lity non-time-critical removal action (NTCRA). The risk evaluation assessed the area in its entirety; and, as a result, two institutional control (IC) areas were created: shallow contamination (0 - 10 ft bgs) and deep contamination (>10 ft bgs). Cs-137 is the only contaminant of concern for human health or that requires access restrictions; all other contaminants were eliminated because they do not present a ri sk to human health or ecological receptors nor require access restrictions. Polychlorinated biphenyls (PCBs) associated with paint in the TAN-607 Hot Shop were buried in the excavation and approved for risk-based disposal as bulk product PCB waste (DOE-ID 2008).

Using information presented in the summary report, the following sections present IC and operations and maintenance (O&M) requirements for TSF-61 and existing Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) Sites (TSF-09, -18, -46, -47, -48, and -53), which are encompassed by TSF-61.

Institutional Controls

The shallow contamination IC area comprised the V-Tanks area and footprints of former Buildings TAN-607 and -607A (see Figure 1 ). The 95% upper confidence limit (UCL) of the mean for shallow (0 - 1 O ft bgs) Cs-137 contamination is 4. 75 pCi/g for the V-Tanks area and 5.05 pCi/g for the former TAN Hot Shop Facility. The more conservative of the two values (5.05 pCi/g) was used to calculate the IC termination date for shallow contamination. However, as presented in Part A, 5.05 pCi/g is below the revised Cs-137 remediation goal for unlimited use/unrestricted exposure (UU/UE) of 6.15 pCi/g in the Explanation of Significant Differences (DOE-ID 2011 ); therefore, Part A reduced the IC boundary, releasing the former TAN Hot Shop Facility for UU/UE.

Shallow contamination in the V-Tanks area also qualifies for UU/UE- the 95% UCL of the mean is 4.75 pCi/g- but deep contamination exceeds acceptable levels for UU/UE (see Figure 1). The 95% UCL of the mean for deep (>10 ft bgs) Cs-137 contamination is 20.42 pCi/g and 19.25 pCi/g for the V-Tanks area and TAN Pool area, respectively. Again, the most conservative value (20.42 pCi/g) was used to estimate the IC termination date for deep contamination.

The Post Remediation Risk Evaluation and Data Summary Report (EDF-6686) calculated termination dates based on the Cs-137 OU 1-10 Record of Decision (ROD) remediation goal (2.3 pCi/g) (DOE-ID 1999). Recalculating the IC termination date using the OU 10-08 Cs-137 residential soil screening level (6.0 pCi/g) (DOE-ID 2010), deep contamination at CERCLA Site TSF-61 will decay to acceptable levels in 52 years and !Cs are not required for shallow contamination. Table 1 presents IC termination dates for shallow (0 - 10 ft) and deep (>10 ft) contamination , comparing termination dates using the OU 1-10 remediation goal (2.3 pCi/g) and the OU 10-08 residential soil screening level (6.0 pCi/g). The recommended IC termination date for TSF-61 is 2060.

Separate !Cs will not be maintained at the six existing CERCLA Sites: TSF-09, -18, -46, -47, -48, and -53. Each site was excavated using an iterative process by first removing soil, followed by surveys to identify hot spots requiring additional excavation (Jessmore et al. 2008). Once soi l concentrations met the remediation goal, a land survey and gamma scan of the final excavation was performed for each area (see Figure -2). !Cs are not required at four of the six sites because average concentrations are below OU 10-08 soil screening level or have decayed to acceptable levels for UU/UE. Deep contamination at TSF-09/18 exceeds acceptable levels for UU/UE. However, the 95% UCL of the mean calculation for the V-Tanks area (20.42 pCi/g, see Table 1) includes TSF-09/18 deep contamination. Thus, !Cs will be terminated at the individual sites. !Cs for deep contamination will be maintained under TSF-61 where separate !Cs are not necessary. Additionally, because !Cs are required for deep contamination but not shallow contamination (see Table 1 ), the TSF-61 boundary can be reduced. Figure 3 shows the refined IC boundary for TSF-61.

435.36 05/12/2014 Rev. 14


Use with MCP-3480 Site Title: V-Tanks and TAN-607 Soil Contamination Area

Legend t.J Deep contamination

OU 1-10 V-Tanks remedial action area TAN Hot Shop Facility NTCRA area

0 Institutional control site : : _ _: Former building or structure location - Road

0 10 20 40 60 6 :-~i-~ii:==~~siiii~' Meters 1· w w Feet 0 25 50 100

G1Sku.11 st Ou t.'l~ru.:rJ 01:e Or.u;\ 1127/201 ~

150

Pl!.'I XtosJAo;ect.s·11.w,nsr:o1_r1s1_1.11ps

200 N

F'l! ULT..!. TSf61_1fTCAA_&_V.TL"llc_Aru-!p_vt mad

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TAN-607A

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TAN-607

5.05 pCl/g

' '

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I

Site Code: TSF-61 Document Number: NSl-26012

/

4.75 pCl/g

TAN-6 15

~19.25pCl/g

'

"' TAN-633 ' \

\

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' I

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20.42 pCl/g

Figure 1. V-Tanks area and former TAN Hot Shop Facility shallow and deep Cs-137 contamination.

2

435.36 05/12/2014 Rev. 14


Use with MCP-3480 Site Title: I Site Code: TSF-61 V-Tanks and TAN-607 Soil Contamination Area I Document Number: NSl-26012

Table 1. Institutional control termination date for CERCLA Site TSF-61.

Contamination Deoth

Shallow (0 - 10 ft)

Deep (>10 ft)

Sample Year 2007

2008

Cs-1373

(oCi/a)

5.05

20.42

IC Termination Dateb Based on OU 1-10 Based on OU 10-08 Remediation Goal Soil Screening Level

(2.3 oCi/q) (6.0 oCi/q)c

2042

2102

ICs not required. Cs-137 concentrations are below soil screening level.

2060

Yellow highlighted text indicates recommended IC termination date.

a. 95% UCL of the mean calculated from samples collected in 2007 and 2008 for shallow and deep contamination, respectively (EDF-6686).

b. The IC termination date was calculated using the formula: t = (1 /A)ln(Ci/Co)

Where t = A = Ct = Co =

decay time in years Cs-137 decay rate constant (y(1

) final Cs-137 concentration initial Cs-137 concentration.

The decay time is then added to the sample year. c. Soil screening level from DOE-ID (2010).

IC institutional control OU operable unit UCL upper confidence limit

3

435.36 05/12/2014 Rev. 14

FEDERAL FACILITY AGREEMENT AND CONSENT ORDER {FFA/CO) NEW SITE IDENTIFICATION {NSI)


.. • • • • - -1•~ •• - • •• ·-.·~ .:.Y. ··c..~ ~; ~· -? - ..r .. ~>:r ~ -. ~ . - .. :.

CERCLA Site TSF-61 ~ D Institutional control site : 1- 1 Insti tutional controls terminated ~ I =:--1 Deep contamination ; - Road

{ 0 5 10

0 15 30

20 30 40

60 90 120 150 Ct $ Mal;tt Oan Uitil!J.T~ D<!t Orr.m:7127f2~ 1 5

50

Pl':\: X1 gi.SJ!(l)ctS'J in\TSF61_tlSl_U ar!

. (

/ Vicinity Map

60

~ Meters Feet

180 210 N

flit lh.:r.t: T~F61_.t.ru_C arrJN_Rtn.l s-ap_v1 .m.. iJ

=~=-"==--....--.....--'

·'

. ' .,.,;,.: / .....

/ "-, ,.......--TSF-53 / '<, (5.19 pCi/g)

... -, I ' TSF-46/46 % " .._ ( '-

(7 .13 pCi/g) A (.-....? \ -~~ '-, \ '-, I ~ ' ' , ', '> I ~( ' I I I I I ' ,('\... I I I I ' ,

..!._ / , I / ' TSF·09/16~J) I \

(17.95 pCilg ) ' , v I, \ ' '- I

' "-..._ I

~ ' ........ _~)'

.. ~~-...

OU 1-10 V-Tanks Cs-137 gamma scan results llCP 2008). Number of Maximum

,_,

Excavation Gamma Scan Number of Concentration Site Depth (ft) Collection Points Detects {pCi/1?)

TSF-09/18 > 20 252 245 168.76 TSF-46/48 10-18 404 379 46.72 TSF-47 10 339 320 22 .66 TSF-53 14 482 432 23.49

Figure 2. Cs-137 gamma scan results at existing CERCLA sites within TSF-61.

4


, i . . • ~ t I ,.

Average Concentration

{pCi/1?) 17.95 7.13 3.70 5.19

_ ..

435.36 05/12/2014 Rev. 14



. •. . . :· ,. r·~. , . -.· CERCLA Site TSF-61

: 0 Reduced institutional control site I

boundary t_' Deep contamination (19.25 pCi/g) -- Road

. ... -.. .. .... -:--• I

TSF I

I~ liil t.::J

Vicinity Map 0 5 10 20 30 40 50 60

:~~i::=~~~~=~~~~=~~M~elters \ 0 15 30 60

• ,; :. -# ,

. , .... I ' , .. ... ,

., . . :f·· ' ·, ... '

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.. ~ : ...

90 120 150

. -..... ·.~.~ · ..

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Figure 3. Refined boundary for TSF-61.

Feet ~ 180 210 N

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l. . . {~ ... , ' - ~. t . / ""·~ ""~ !~-. -r. • .

• 'i

(. •

435.36 05/12/2014 Rev. 14

FEDERAL FACILITY AGREEMENT AND CONSENT ORDER (FFAJCO) NEW SITE IDENTIFICATION (NSI)

Use with MCP-3480 Site Title: Site Code: TSF-61 V-Tanks and TAN-607 Soil Contamination Area Document Number: NSl-26012

Operations and Maintenance As shown in Figure 4, O&M are temporarily being implemented at the V-Tanks and TAN-607 Areaunder the Site-wide IC/O&M Plan (DOE-ID 2015) because O&M for this area surrounding site TSF-61 were required to control noxious weeds by the OU 1-10 ROD Explanation of Significant Differences (DOE-ID 2005) as well as for soi l erosion and proper site drainage by the Removal Action Report (DOE-ID 2008). O&M (DOE-ID 2015) includes inspections for vegetation and weeds, animal intrusions, subsidence, and erosion as well as topographic surveys. Appropriate actions will be taken to address any items identified during annual IC inspections The next revision to the Site-wide IC/O&M Plan will be updated with this information and to indicate these requirements are no longer temporary, or to make any changes agreed to by the U.S Department of Energy, U.S. Environmental Protection Agency, the Idaho Department of Environmental Quality.

Legend 0 lnstilutional control site 1':. ~ Oeep contamination

. . \'f ~·· . . ~~ . ,

Figure 4. V-Tanks and TAN-607 Operations and Maintenance area.

6

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435.36 05/12/2014 Rev. 14


Use with MCP-3480 Site Title: I Site Code: TSF-61 V-Tanks and TAN-607 Soil Contamination Area I Document Number: NSl-26012

References DOE-ID, 1999, Final Record of Decision for Test Area North Operable Unit 1-10, Idaho National Engineering and Environmental

Laboratory, DOE/ID-10682, Rev. 0, U.S. Department of Energy Idaho Operations Office; U.S. Environmental Protection Agency, Region 10; Idaho Department of Health and Welfare, Division of Environmental Quality, December 1999.

DOE-ID, 2005, Explanation of Significant Differences for the Record of Decision for the Test Area North Operable Unit 1-10 at the Idaho National Engineering and Environmental Laboratory, DOE/NE-ID-11199, Rev. 0, U.S. Department of Energy Idaho Operations Office; U.S. Environmental Protection Agency, Region 1 O; Idaho Department of Environmental Quality, January 2005.

DOE-ID, 2008, Final Removal Action Report for Test Area North 607 A and 607, DOE/ID-11362, U.S. Department of Energy Idaho Operations Office, September 2008.

DOE-ID, 2010, Operable Unit 10-08 Remedial Design/Remedial Action Work Plan, DOE/ID-11418, Rev. 0, U.S. Department of Energy Idaho Operations Office, August 2010.

DOE-ID, 2011, Explanation of Significant Differences to Revise Institutional Controls in Various Records of Decision at the Idaho National Laboratory Site, DOE/ID-11439, Rev. 0, U.S. Department of Energy Idaho Operations Office; U.S. Environmental Protection Agency, Region 10; Idaho Department of Environmental Quality, September 2011.

DOE-ID, 2015, /NL Site-wide Institutional Controls, and Operations and Maintenance Plan for CERCLA Response Actions, DOE/ID-11042, Rev. 9, U.S. Department of Energy Idaho Operations Office, January 2015.

EDF-6686, 2008, "Post Remediation Risk Evaluation and Data Summary Report for TSF-09/18/21, TSF-46/47/48, TSF-53, TSF-06 Area 1 and the TAN-607 NTCRA Soil Remediation Sites," Rev. 3, Idaho Cleanup Project, July 2008.

Jessmore, James J., Richard K. Farnsworth, Stuart K. Janikowski, David L. Eaton, and Allen E. Jantz, 2008, Remedial Action Report for OU 1-10 Sites at Test Area North, WAG 1, DOE/ID-11 262, Rev. 0, U.S. Department of Energy Idaho Operations Office, April 2008.

2. OU 10-08 Recommendation ~ Yes D No

D NoAction ~ No Further Action with Institutional Controls D Removal and Disposal Plug-in Remedy (meets remedy profile)

3. Assignment to Operable Unit Recommendation

Assign waste area group (WAG) and operable unit (OU):

WAG:

D Explanation of Significant Differences D Record of Decision Amendment D Remedial Investigation/Feasibility Study -7 Record of Decision D Removal Action -7 Action Memorandum D Plug-in Remedy Memorandum D Minor Change Memorandum D Memorandum to File D NSI Only (i.e., no change to previous decision for an existing site)

4. Prepared By:

Valerie M. Kimbro Name (printed) Signature

5. Idaho Cleanup Project Environmental Restoration Directo/ Concurrence: /

, A j"' A

Frank L. Webber /71_-1+ ,"'""~:..:.....:'-----'-'~::__---'(L...:..Jl,W'V...:.......:'---_.!'.:._VV_ "'_ '--=-Name (printed) ... ,.... Signature

7

August5,2015 Date

August5,2015 Date

435.36 05/12/2014 Rev. 14 Use with MCP-3480 Site Tltle:


Site Code: TSF-61 V-Tanlcs and TAN-607 Soll Contamination Area Document Number: NSl-26012

PARTB

6. FFA/CO Remedial Project Manager (RPM) C~currence: ·

DOE-ID FFA/CO RPM: . · lSY Concur with recJ~mendatlo~. 0 Do not concur with recommendation.

Nlcole Badrov ./ _._l'.Dfe. &{(,Q {Ut/ f-...,,/6"-··...._,(S"----Name (printed) · · .. Signature Date

Explanation:

EPA FFA/CO RPM: 0 Concur with recommendation. 0 Do not concur wllh recommendation .. ·

Dennis Faulk Name (printed) Signature Date

Explanation:

DEQ FFA/CO RPM:

Daryl l<och Name (printed)

Explanation:

8

435.36 05/12/2014 Rev. 14 Use with MCP-3480 Site Title:

FEDERAL FACILITY AGREEMENT AND CONSENT ORDER (FFA/CO) NEW SITE IDENTIFICATION (N~I)

Site Code: TSF·61 V-Tanks and TAN-607 Soll Contamination Area Document Number: NSl-26012

PARTB

FFA/CO Remedial Project Manager (RPM) C~currence:

DOE·ID FFA/CO RPM: rsY Concur with recJ~mendation. D Do not concur with recommendation.

Nlcole Badrov ./ .-'- ('A{a_ &J {\l t/ 5'-._,,/ (J"-J-1 ...... >='-----Name (printed) ·· · · Signature · Date

6.

Explanation:

EPA FFA/CO RPM:

Dennis Faulk Name (printed)

Explanation:

DEQ FFA/CO RPM: D Concur with recommendation. D Do not concur with recommendation.

Daryl l<och Name (printed) Signature Date

Explanation:

8

435.36 federal facility agreement and consent … · ou 10-08 soil screening level or have decayed...

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