05 February 2015

DeAnna Rothhaupt

DEPARTMENT OF THE AIR FORCE HEADQUARTERS 49TH WING (ACC)

HOLLOMAN AIR FORCE BASE NEW MEXICO

Chief, Holloman AFB Environmental 550 Tabosa A venue Holloman AFB NM 88330-8458

Mr. John E. Kieling Chief, Hazardous Waste Bureau New Mexico Environmental Department 2905 Rodeo Park Drive East Bldg. 1 Santa Fe NM 87505-6063

Re: Letter Work Plan for OT-32 (AOC-PRI-A) EPA ID# NM6572124422, HWB-HAFB-12-017 Holloman Air Force Base, Alamogordo, New Mexico Contract No. F A8903-l 3-C-0008

Dear Mr. Kieling:

L

NMEO Hazardous Waste Bureau

FPM Remediations/URS Group, Inc. (URS) is tasked by the Air Force Civil Engineer Center (AFCEC) with achieving Corrective Action Complete (CAC) without Controls at the Primate Research Lab Sewer Line (Environmental Restoration Program [ERP] Site OT-32, AOC-PRI-A) located at Holloman Air Force Base (AFB; Figure 1). URS has reviewed the New Mexico Environmental Department (NMED) disapproval letter dated September 18, 2014 for the Accelerated Corrective Measures (ACM) Completion Report (Bhate 2012) and understands that the rationale for the disapproval is based upon:

• Detection of 1, 1-dichloroethene (DCE) in monitoring well OT32-TMW09 (TMW-09) at 18 micrograms per liter (ug/L), in exceedance of the NM Water Quality Control Commission (NMWQCC) groundwater standard of 5ug/L, and

• Questionable groundwater flow direction as depicted in the ACM Completion Report.

URS has evaluated the data available for this Site, taken preliminary action to gather additional data, and is now providing this letter work plan that further describes the proposed supplemental work.

Site Description and Previous Investigations

OT-32 is located along the waste discharge sewer line of the former Primate Research Institute (PRI). The former PRI is located on Douglas Road near the intersection with Vandergrift Road, approximately two miles north of the Main Base Area (Figure 1). For a detailed history and description of the site, refer to the ACM Completion Report (Bhate 2012).

GLOBAL POWER FOR AMERICA

Mr. John Kieling, NMED February 5, 2015 Page 2 of 3

Global Power for America

In 2007, twelve (12) soil borings were drilled along 2,600 ft of the sewer line and completed as temporary groundwater monitoring wells. The temporary wells were surveyed to evaluate hydraulic conditions at the site, and sampled for laboratory analysis (Figure 2). Results of the 2007 groundwater monitoring investigation indicated one elevated concentration of 1,1-DCE in well TMW-09 at 18 ug/L (Figure 2). All other analytes were below the NMWQCC groundwater standards. The groundwater flow direction illustrated in the ACM Completion Report (Bhate 2012) indicated groundwater flow to the south. URS re-evaluated these potentiometric data and believe the data was contoured incorrectly (variable contour intervals and lack of a holistic approach). The data were re-contoured using the same potentiometric data and applying standard rules of contouring. The resulting potentiometric surface indicates that groundwater flows to the southwest, consistent with the flow direction observed at other locations in this area of Holloman AFB (Figure 2).

In 2014, a URS field team was at Holloman AFB conducting work at other ERP sites. The field presence was used as an opportunity to collect new water-level measurements at OT-32, as well as a groundwater sample for analysis of volatile organic compounds (VOC) from the TMW-09 well that showed an elevated 1,1-DCE concentration in 2007. In addition to TMW-09, surrounding wells TMW-08 and TMW-10 were also sampled and analyzed for VOCs to confirm the previous results. Because of uncertainties in the existing survey data, all twelve (12) temporary monitoring wells were also re-surveyed, and the new potentiometric data were contoured to confirm the Site’s groundwater flow direction.

The November 2014 potentiometric data confirms that groundwater at the OT-32 site flows to the southwest (Figure 3), consistent with the re-contoured data from 2007. Analytical results from 2014 indicate that the 1,1-DCE is still present in TMW-09 (12 ug/L), but the concentration has decreased by approximately 30 percent over the last seven (7) years. Groundwater analysis at adjacent wells TMW-08 and TMW-10 did not detect any VOCs, consistent with the data reported in 2007 (Figure 3). Total Dissolved Solids (TDS) were also evaluated in 2007 from these three (3) wells, with concentrations ranging from 13,000 to 14,000 milligrams per liter (mg/L) (Bhate 2012). Based on these data, the extent of 1,1-DCE is localized, attenuating, and approaching the relevant NMWQCC standard.

Course of Action

As stipulated in NMED’s Response to the Notice of Disapproval letter (December 5, 2014), the plan is to “conduct two additional quarters of groundwater sampling at monitoring well OT32-TMW09.” The groundwater sample will be analyzed for VOCs and TDS. The November 2014 sample event represents the first quarterly sampling event and the second event is planned for Spring 2015. At that time, a new round of water-level measurements from the twelve (12) wells will be collected and an updated potentiometric surface map will be created for the site.

Reporting

A brief letter report that includes the two quarters of analytical results, as well as updated potentiometric surface maps will be prepared and submitted to the NMED. As indicated in the 2014 disapproval letter, following receipt of the report, “NMED will make a decision regarding the need for future site characterization activities”.

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72 3 72 1

71 025 3

25 5

25 725 6

25 4

25 2

25 0 23 7

23 9

24 1

24 3

24 5 24 0

23 8

23 623 4 70 8

25 124 8

24 6

24 4

24 2 70 9

24 7

24 923 0

23 2

23 5

70 7

22 8

23 323 1

22 9

70 6

70 5 70 370 1

22 122 3

22 5

22 7

22 6

22 422 2

20 7

20 5

22 0

21 8

20 3

20 1

21 0

21 4

21 2

21 6 21 921 7

21 521 3

21 1

60 1

61 661 4

60 260 4

60 6

60 3 60 560 7

60 961 1

61 2

60 8

61 8 61 0

62 0

62 161 9

61 761 5

61 320 8

20 9

28 1 4

83 1 1 7

DML & BUR N FCL T Y

2

35

8

12 9 112 9 212 9 3

WE S T G A T E A V

E

B Y P A S S R O A D

60 0

59 959 8

25

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#*

#*

#*#*

#*#*#*

Ho

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AF

B

US/TC-50 8-SS18-M W19-US/TC-50 8-SS18-M W18-

US/TC-50 8-SS18-M W16-

US/TC-50 8-SS18-M W08-

"mw"(no additio naldata avail able)

FRONT GATE

OT-32 SEPTIC TANK SYSTEM

HOSPITALCE HQ/ADM

BLDG 1266

WWTF-ADMIN

DEMOLISHEDBX/FOOD

GAS STATIONHolloman AFBHolloman AFB

£¤70

O t e r oO t e r oC o u n t yC o u n t y

Lo

st R iv er

R e d A rr oyo

Los t

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Holloman Air Force Base

White Sands Missile Tes ting

CT

White Sands National Monument

February 2, 2015

0 7,000

Scale in FeetHolloman Air Force Base

USAF

Designed

Drawn

Project Number

LED

23446543

Figure 1

OT-32 Site Locationµ

F:\

GIS

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\Fig

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ap_s

outh

.mxd

JDM

Checked

Peer ReviewDAE

DAE

Project ManagerBGP

1 inch = 7,000 feet

Legend#* Base Features

") Site

Installation Area

Federal DOD Property

Existing Structure

Slab Area

Airfield Facility Surface Site

Fence

Pedestrian Sidewalk Area

Paved Road

Paved Road (label)

Active Single Railroad Centerline

Athletic Field

Athletic Court

Playground

Federal DOD Property

Existing Structure

Slab Area

Airfield Facility Surface Site

Fence

Pedestrian Sidewalk Area

Paved Road

Paved Road (label)

Athletic Field

Athletic Court

Playground

Sources:HAFB, CBI, ULS Services Corp.

Coordinate System:NAD 1983 State Plane, New Mexico Central Zone, Feet

!<!<

!<!<

!<

!<

!<

!<

!<

!<

!<

!<

OT-32-SB05 (TMW5)4080.03

OT32-SB12 (TMW12)4079.55

OT32-SB11 (TMW11)4079.55

OT32-SB10 (TMW10)4079.631,1-DCE: ND

OT32-SB09 (TMW09)4079.721,1-DCE: 18 mg/kg

OT32-SB08 (TMW08)4079.741,1-DCE: ND

OT32-SB07 (TMW07)4079.81

OT32-SB06 (TMW06)4079.89

OT32-SB03 (TMW03)4080.91

OT32-SB02 (TMW02)4081.52

OT32-SB01 (TMW01)4082.74

OT32-SB04 (TMW04)4080.21

4079.5

4080.0

4080.5

4081.0

4081.54082.0

4080.0

4081.0

4080.0

4080.5

4081.0

4081.5

4082.0

4080.5

4081.5

DOUGLAS

VAND

ERGR

IFT

1204

1208

1200

1205

1202 1201

1203

12061207

Source: Esri, DigitalGlobe, GeoEye, i-cubed, Earthstar Geographics, CNES/Airbus DS, USDA,USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community

February 2, 2015

0 200 40050 100 150

Scale in FeetHolloman Air Force Base

USAF

Designed

Drawn

Project Number

LED

23446543

Figure 2Former Primate Research Area

OT-322007 Potentiometric Surface Map with

Groundwater Analytical Results for 1,1-DCEµ

Legend

!<ACM Temporary MonitoringWell Location (2007)

Flow Direction

Potentiometric Contour (0.5 ft interval)

Dashed where inferred

Buildings

Historical Structure

Existing Structure

Road Centerline

Natural Gas Line

Wastewater Line

Water Line

Underground Comm Line

F:\

GIS

\Pro

ject

s\A

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T32

_dce

_up

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pote

ntio

me

tric

_DC

E_

Jul2

007

.mxd

JDM

Checked

Peer ReviewDAE

MEH

Project ManagerBGP

Note:

Sources:HAFB, Bhate (2012), ULS Services Corp.

Coordinate System:NAD 1983 State Plane, New Mexico Central Zone, Feet

1 inch = 200 feet

Groundwater Elevation, July 20074080.21

!A

!A

!A

!A

!A

!A

!A

!A

!A!A

!A!A

MW094078.79

1,1-DCE: 12.0 mg/kg

MW01MW024081.33

MW03Dry at 4081.16

MW044080.06MW05

4079.85

MW064079.47

MW074079.28

MW084079.03

1,1-DCE: ND

MW104078.62

1,1-DCE: ND

MW114078.48

MW124078.31

4079.5

4081.0

4081.5

4080.5

4080.0

4079.0

4080.0

4080.5

4080.5

4080.0

4079.0

4079.0

1204

1208

1200

1205

1202 1201

1203

12061207

Source: Esri, DigitalGlobe, GeoEye, i-cubed, Earthstar Geographics, CNES/Airbus DS, USDA,USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community

February 2, 2015

0 200 40050 100 150

Scale in FeetHolloman Air Force Base

USAF

Designed

Drawn

Project Number

LED

23446543

Figure 3Former Primate Research Area

OT-322014 Potentiometric Surface Map with

Groundwater Analytical Results for 1,1-DCEµ

Legend

!A Temporary Monitor Well

Flow Direction

Potentiometric Contour (0.5 ft interval)

Dashed where inferred

Building

Installation Area

Wastewater Line

Water Line

F:\

GIS

\Pro

ject

s\A

ZN

M_P

BR

_Hol

lom

anA

FB

\Site

Ma

ps\O

T32

_dce

_up

date

\OT

32_

pote

ntio

me

tric

_DC

E_

Nov

2014

.mxd

JDM

Checked

Peer ReviewDAE

MEH

Project ManagerBGP

Note:

Sources:HAFB, Bhate (2012), ULS Services Corp.

Coordinate System:NAD 1983 State Plane, New Mexico Central Zone, Feet

1 inch = 200 feet

!

!.!.!.!.!.!.!.!.!.!.!.!.!.

OT-32 LocationGroundwater Elevation, November 20144078.48