KU SMAK.A DAM .M. ~:;:,~b - hwbdocuments.env.nm.gov AFB/2015-11-02 Final... · DEPARTMENT OF THE AIR FORCE HEADQUARTERS 49TH WING (ACC) HOLLOMAN AIR FORCE BASE NEW MEXICO ADAM M

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

HOLLOMAN AIR FORCE BASE NEW MEXICO

ADAM M. KUSMAK, GS-I3, USAF Chief, Installation Management Flight ( 49 CES/CEI) 49th Civil Engineer Squadron ( 49 CES) Holloman Air Force Base, NM

New Mexico Environment Department Attn: Mr. John Kieling, Chief Hazardous Waste Bureau 2905 Rodeo Park Drive East, Building I Santa Fe, NM 87505-6063

Re: Final Evaluation of Arsenic in Groundwater at SS-13 (AOC-J) Report EPA ID# NM6572124422, HWB-HAFB-12-001 Holloman Air Force Base, Alamogordo, NM Contract No. F A8903-I3-C-0008

Dear Mr. Kieling,

November 2, 20I5

l\ f~ECEIVED

Attached is the Final Evaluation of Arsenic in Groundwater at SS-13 (AOC-J) Report. This report is submitted in response to the NMED's October I, 20I3 disapproval letter for the Accelerated Corrective Measures Completion Report for SS-13 from December 2011. The report is on the enclosed CD, with native and PDF files.

I certify under penalty of law that this document and all attachments were prepared under my direction or supervision according to a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

If you have any questions regarding this submittal, please contact me at (575) 572-6675 or by email at [email protected].

Sincerely, KU SMAK.A DAM .M. ~~·::0;_·~:~ds~:~!~~~:~::~0~60~:;:,~b 1263331806 ~~;e~~~~~\n,"~~;~:5KO~D~~o~1263331806

ADAM M. KUSMAK, GS-13, USAF

Attachment(s): Final Evaluation of Arsenic in Groundwater at SS-13 (AOC-J). Hard copy and CD.

cc: Mr. Dave Strasser, NMED HWB (w/ Atch) Mr. Cornelius Amindyas, NMED HWB (w/o Atch) Mr. Will Moats, NMED HWB (w/o Atch) Mr. Chuck Hendrickson, USEPA (w/CD only) Ms. DeAnna Rothhaupt, HAFB (w/Atch) Mr. Charles Schick, HAFB (w/CD) Mr. Brian Renaghan, AFCEC (w/ Atch) Mr. Wayne Bittner, Kirtland AFB (w/Atch, 2 CDs)

GLOBAL POWER FOR AMERICA

EVALUATION OF ARSENIC IN GROUNDWATERAT SS-13 (AOC-J)

Holloman Air Force Base, New Mexico

Prepared forAir Force Civil Engineer Center

2261 Hughes Ave, Suite 155Joint Base San Antonio Lackland, Texas 78236-9853

Contract No.: FA8903-13-C-0008

URS Group, Inc.Denver, Colorado

November 2015

Evaluation of Arsenic in Groundwater at SS-13Holloman AFB, NM

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TABLE OF CONTENTS

1.0 INTRODUCTION .........................................................................................................12.0 SITE DESCRIPTION AND PREVIOUS INVESTIGATIONS ...................................1

3.0 GROUNDWATER MONITORING IN 2015 ...............................................................24.0 GROUNDWATER DATA RESULTS ..........................................................................2

4.1 Potentiometric Data .........................................................................................................24.2 Total Arsenic in Groundwater ..........................................................................................24.3 Dissolved Arsenic in Groundwater ..................................................................................24.4 Total Dissolved Solids .....................................................................................................2

5.0 EVALUATION OF GROUNDWATER RESULTS.....................................................35.1 Total Arsenic in Groundwater ..........................................................................................35.2 Dissolved Arsenic in Groundwater ..................................................................................35.3 Total Dissolved Solids .....................................................................................................35.4 Background Levels of Arsenic in Groundwater ................................................................4

6.0 CONCLUSIONS AND RECOMMENDATION ..........................................................5

7.0 REFERENCES ..............................................................................................................5

LIST OF TABLES

Table 1 Summary of SS-13 Analytical Results

LIST OF FIGURES

Figure 1 SS-13 Site Location MapFigure 2 SS-13 Potentiometric Surface (July 2015)Figure 3 SS-13 Total and Dissolved Arsenic in Groundwater Isoconcentration Map (July

2015)Figure 4 Location of Background Well S10-MW4


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LIST OF ACRONYMS AND ABBREVIATIONS

ACM Accelerated Corrective MeasuresAFB Air Force BaseAFCEC Air Force Civil Engineer CenterAOC Area of ConcernCAC Corrective Action CompleteDRMO Defense Reutilization Management OfficeERP Environmental Restoration ProgramFt feetIRP Installation Restoration ProgramMCL maximum contaminant levelmg/L milligrams per literNMAC New Mexico Administrative CodeNMED New Mexico Environment DepartmentNMWQCC New Mexico Water Quality Control CommissionRCRA Resource Conservation and Recovery ActSVOC semivolatile organic compoundTDS total dissolved solidsURS URS Group, Inc.USEPA United States Environmental Protection AgencyVOC volatile organic compound


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1.0 INTRODUCTION

This report evaluates arsenic concentrations in groundwater at the Sodium Arsenite Spill Area(Environmental Restoration Program [ERP] Site SS-13, Area of Concern [AOC] -J) located atHolloman Air Force Base (AFB) (Figure 1). An Accelerated Corrective Measures (ACM)Completion Report was submitted to the New Mexico Environmental Department (NMED) in 2011(North Wind, Inc. 2011), but disapproved by NMED (letter dated October 1, 2013) on the basis of:

· Detection of arsenic in monitoring wells at SS-13 in exceedance of the approved base-widebackground level for total arsenic in groundwater of 0.01 milligrams per liter (mg/L)(derived from the United States Environmental Protection Agency (USEPA) MaximumContaminant Level (MCL)).

· Lack of figures depicting locations of soil borings and monitoring wells, potentiometricsurface map, and contaminant isoconcentration map of arsenic in groundwater.

The existing site data from 2009, supplemented with additional data collected in 2015, is evaluatedin this report to better understand the past and current conditions. Figures have been revised toaddress NMED’s comments regarding the location of soil borings and groundwater monitoringwells, and the requirement for a potentiometric map and an isoconcentration map of arsenic levelsin groundwater. Using the Final Base-wide Background Study Report (NationView|Bhate 2011),additional rationale is provided for why the reported arsenic values are considered representative ofbackground conditions, and not anthropogenic in origin.

2.0 SITE DESCRIPTION AND PREVIOUS INVESTIGATIONS

The Sodium Arsenite Spill Area is located in the Civil Engineering complex yard, next to theDefense Reutilization Management Office (DRMO) (Figure 1). The site was originally used tostore sodium arsenite and, in 1979, an estimated 2 to 30 gallons of sodium arsenite was releasedwithin an earthen storage area (i.e., depression) at the site. At the spill site, two soil borings andone monitoring well were installed and sampled during the Phase II Installation RestorationProgram (IRP) investigation (Dames and Moore 1987). Soil and groundwater samples wereanalyzed for arsenic. The Phase II IRP results identified arsenic in groundwater at 0.01 mg/L,and extraction procedure-toxicity analysis of five soil samples reported a maximum arsenicconcentration of 0.04 mg/L in the extract. The depression was backfilled and capped withasphalt in the early 1990s (North Wind, Inc. 2011).The site was not considered sufficiently characterized as required in the base’s ResourceConservation and Recovery Act (RCRA) permit. Therefore, additional characterization andpotential remediation of the release were required. In brief, three shallow groundwatermonitoring wells (MW01, MW02, and MW04S) and one deep groundwater monitoring well(MW04D) were installed and sampled for total arsenic in February 2009. The total arsenicdetected in 2009 at MW01, MW02, MW04S, and MW04D was 0.0125, 0.0508, 0.0294, and0.0342 mg/L, respectively. For a detailed history and description of the site and activitiesconducted as part of the ACM, refer to the ACM Completion Report (North Wind, Inc. 2011).

NMED disapproved the 2011 ACM Completion Report and required Holloman AFB todemonstrate that the reported arsenic concentrations should be considered as representative ofbackground conditions, and not anthropogenic in origin (October 1, 2013).


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3.0 GROUNDWATER MONITORING IN 2015

In July 2015, more than six years after the prior sampling event, groundwater sampling wasconducted at SS-13 to assess current site conditions. Groundwater samples were collected fromthe site’s four monitoring wells (MW01, MW02, MW04S, and MW04D) and submitted forlaboratory analysis of total and dissolved arsenic, and Total Dissolved Solids (TDS). Note, inthe 2009 sampling event, only total arsenic samples were collected from groundwater. Prior tosampling, groundwater levels were measured at all SS-13 monitoring wells to assess the site’spotentiometric surface and determine groundwater flow direction. Sample collection logs areprovided in Attachment 1.

4.0 GROUNDWATER DATA RESULTS

4.1 Potentiometric Data

Groundwater measurements from the four site wells in July 2015 indicate a depth to water of lessthan 7 feet below the ground surface, a relatively flat hydraulic gradient, and a groundwater flowdirection towards the west-southwest, which is consistent with the regional Holloman AFBgroundwater flow direction in that area of the base (Figure 2).

4.2 Total Arsenic in Groundwater

Analytical results from 2015 indicate that total arsenic concentrations range from 0.0071 to0.037 mg/L in contrast to 2009 results, which ranged from 0.0125 to 0.0508 mg/L (Table 1). The2015 concentration of total arsenic in the deep well, MW04D, is 0.037 mg/L, similar to theconcentration from 2009, 0.0342 mg/L.

4.3 Dissolved Arsenic in Groundwater

As stated above, dissolved arsenic in groundwater was not originally sampled in 2009, but wassampled in 2015. Dissolved arsenic is important because the New Mexico Water QualityControl Commission (NMWQCC) standard (0.1 mg/L, New Mexico Administrative Code[NMAC] 20.6.2.3103) is based on the dissolved fraction. The dissolved fractions reported forarsenic in the 2015 data are consistently lower than the reported values for the total fraction. Thedissolved arsenic concentrations in 2015 ranged from 0.00658 to 0.034 mg/L. These values areall less than the NMWQCC human health standard of 0.1 mg/L, and thus do not present risk tohuman health.

4.4 Total Dissolved Solids

TDS concentrations in the four site wells are generally consistent between the 2009 and 2015groundwater sampling events (Table 1). The TDS concentrations from 2009/2015 in wellsMW01, MW02 and MW04S are all less than 10,000 mg/L (5,150/7,100, 8,630/6,600,6,900/6,200, respectively). The TDS concentrations in well MW04D from 2009/2015 are22,700/29,000 mg/L, two to three times the 10,000 mg/L threshold listed in the NMAC20.6.2.3103, NMWQCC Human Health Standards, below which human health standards apply.


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Despite the presence of elevated TDS in the deeper well (MW04D, 29,000 mg/L), NMEDconsiders the groundwater at this site to be subject to the NMWQCC standards due to the lowerTDS concentrations (less than 10,000 mg/L) present in the shallower site wells. As defined inNMAC 20.6.2.3103, the human health standards apply to the dissolved portion of groundwater,an analysis that was not previously performed at SS-13.

5.0 EVALUATION OF GROUNDWATER RESULTS

5.1 Total Arsenic in Groundwater

A comparison of 2009 to 2015 groundwater results indicate that total arsenic concentrations havedecreased in the three shallow wells MW01, MW02, and MW4S by approximately 41, 76, and76 percent, respectively (Table 1). The total arsenic concentrations in 2015 from these threewells are below, or approximate to, the MCL of 0.01 mg/L. In the case of MW04D, the deepwell, the total arsenic concentration is 0.037 mg/L, and although this concentration is greaterthan the MCL of 0.01 mg/L, this well also has a TDS concentration of 29,000 mg/L, greater thanthe 10,000 mg/L TDS threshold that determines whether constituents are subject to NMWQCChuman health standards.These concentration reductions may be partially due to reduced turbidity in groundwater samplesas a result of changes to methodology (i.e., 2009 samples were obtained with bailers, while 2015samples were obtained via peristaltic pump). Total arsenic analysis may be greatly influenced bysuspended particulates within the sample aliquot, and any particulates contained within thepreserved sample bottles are artifacts of the natural soil. Furthermore, sodium arsenite is ahighly water soluble salt, likely to exist in the saturated interval only as a dissolved-phasecompound. Therefore, total arsenic analysis is not the most appropriate metric for evaluation ofa sodium arsenite spill.

5.2 Dissolved Arsenic in Groundwater

Since sodium arsenite is a highly water soluble salt, analysis of dissolved arsenic is a moreappropriate metric for evaluation of a sodium arsenite spill. This analysis that has not previouslybeen performed at SS-13.All four of the sampled wells at SS-13 (MW01, MW02, MW04S, and MW04D) had dissolvedarsenic concentrations below the NMWQCC standard of 0.1 mg/L (Table 1 and Figure 3).Therefore, arsenic does not present a risk to human health based on the NMWQCC standard forarsenic in groundwater.

5.3 Total Dissolved Solids

Groundwater beneath Holloman AFB is naturally of poor quality due to high TDS within theTularosa Basin Aquifer, with a mean concentration of approximately 22,000 mg/L and maximumobserved concentration of 50,000 mg/L (NationView|Bhate 2011). The groundwater TDSconcentrations, and lack of interconnectedness with other aquifers, result in classification of theaquifer by USEPA guidelines as a Class IIIB aquifer- designated as unsuitable for humanconsumption, and not a potential source of drinking water (NationView|Bhate 2011). Ingestionof groundwater is an unlikely human health exposure pathway due to aquifer characteristics, andingestion of high-TDS groundwater from the aquifer zone represented by MW04D, in particular,


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is highly unlikely. On this basis, the use of MCLs in determining cleanup goals is notappropriate.

However, despite the presence of elevated TDS in the deeper well (MW04D, 29,000 mg/L),NMED still considers the groundwater at this site to be subject to the NMWQCC standards dueto the lower TDS concentrations present in the shallower site wells. Therefore, as defined inNMAC 20.6.2.3103, NMWQCC Human Health Standards apply to the dissolved portion ofgroundwater.

5.4 Background Levels of Arsenic in Groundwater

In the Final Base-wide Background Study Report (NationView|Bhate 2011) that was partiallyapproved by NMED (NMED 2011), background levels were originally proposed for total anddissolved arsenic at Holloman AFB at concentrations of 0.026 and 0.029 mg/L, respectively –more than twice the value of any arsenic concentrations measured in the shallow SS-13 wells.However, since the proposed background level for the constituent in groundwater exceeded aNMWQCC standard or USEPA MCL (as is the case for arsenic), NMED generally sets theapproved background level to the NMWQCC or MCL, whichever is the lower. In the PartialApproval Letter from NMED (August 12, 2011), the background level for arsenic was set at 0.01mg/L for both total and dissolved arsenic based on the more conservative USEPA MCL for totalarsenic.

NMED also stated that empirical data obtained from background wells may be used to evaluatethe true background concentrations of total and/or dissolved groundwater constituents at AOCswhich require groundwater monitoring or remediation (NMED 2011). It should also be notedthat, as part of the Base-Wide Background Study, dissolved arsenic concentrations in samplescollected from 24 wells across Holloman AFB ranged from 0.0045 mg/L to 0.025 mg/L, with acalculated upper tolerance limit (UTL) of approximately 0.029 mg/L (NationView|Bhate 2011).

With this in mind, a more appropriate background level for total and/or dissolved arsenic ingroundwater at SS-13 may be 0.021 mg/L. This number is based on the total and dissolvedarsenic concentrations from background monitoring well S10-MW4, as reported in the Base-wide Background Study Report (NationView|Bhate 2011). Monitoring well S10-MW4 is one ofthe wells used to determine background groundwater constituent concentrations at HollomanAFB, and is the nearest of the background wells to SS-13, located approximately 1,000 feet (ft)to the east (cross/up-gradient) from the site (Figure 4). Well S10-MW4 is constructed similarlyto the monitoring wells at SS-13, being 2-inch diameter, approximately 20 ft total depth, with adepth to groundwater of approximately 7 ft below ground surface (NationView|Bhate 2011).There are also indications of a widespread area of elevated total and dissolved arsenic in thatportion of the Base.. For more detailed information, please refer to Figures 5-89 and 5-122 ofthe Base-wide Background Study Report (NationView|Bhate 2011) - provided in Attachment 2.

This proposed site-specific background concentration for both total and dissolved arsenic at SS-13 is approximate to the values proposed for consideration as base-wide background values forall of Holloman AFB, but is more conservative and tied to a local reference. Additionally, it maystill be possible that arsenic could occur naturally in groundwater above a concentration of 0.021mg/L, depending on local soil and groundwater characteristics.The concentrations of total and dissolved arsenic in the shallow SS-13 monitoring wells (MW01,MW02, and MW04S) are all below 0.021 mg/L. The total and dissolved arsenic concentrations


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found in MW04D are above this proposed site-specific background level; however, MW04Dalso has a reported TDS concentration greater than 10,000 mg/L and is therefore not subject tothe NMWQCC human health standards. Additionally, well MW04D is constructed in the sameborehole as MW04S, and the screened intervals are separated vertically by approximately 6 feetof sediments including silty clay and clayey sand (North Wind, Inc. 2011). The lowerconcentrations of arsenic and TDS in the shallow well and the separation of the two screenedintervals by low permeability sediments indicate that the source of elevated arsenic and TDSconcentrations in the deeper well is not the surface spill of sodium arsenite. Furthermore, thelithologic log for this borehole indicates that the deeper well (MW04D) is screened across aninterval interspersed with weathered gypsum which may contain additional evaporite mineralsnot identified (North Wind, Inc. 2011).

6.0 CONCLUSIONS AND RECOMMENDATION

Based on an evaluation of available data, the current concentrations of arsenic found in groundwater(total and dissolved) at SS-13 are considered to be representative of naturally-occurring conditionsand do not present a risk to human health. This conclusion is based on the following:

· A site-specific background level for arsenic in groundwater at SS-13 is proposed as 0.021mg/L. This is derived from well S10-MW4, an upgradient well used as part of the HollomanBackground Study (NationView|Bhate 2011).

o Concentrations of arsenic in shallow SS-13 monitoring wells are all below 0.021mg/L, and are therefore likely to be representative of natural background conditions.

o The arsenic concentrations found in MW04D (0.037 mg/L) are above this proposedbackground level of 0.021 mg/L; however, MW04D has a TDS concentration of29,000 mg/L, nearly a factor of three above the TDS threshold of 10,000 mg/Labove which the NMWQCC human health standards no longer apply.

· All four of the site monitoring wells contain dissolved arsenic concentrations below theNMWQCC standard of 0.1 mg/L and therefore an additional human health risk assessmentis not necessary;

· Concentrations of total arsenic measured in the shallow SS-13 monitoring wells in July 2015are approximately 41 to 76 percent lower than 2009 measurements, likely due to changes insampling methodology; however, if earlier arsenic concentrations were attributable to thesodium arsenite spill, they’ve since attenuated;

· Due to aquifer properties, ingestion of groundwater is not a likely exposure pathway, andtherefore the use of MCLs in determining cleanup goals is not appropriate;

Therefore, based on the current evaluation, it is recommended that site SS-13 be considered forCAC status with no institutional controls.

7.0 REFERENCES

Dames and Moore 1987. Phase II Installation Restoration Program (IRP), Holloman Air ForceBase, New Mexico.


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New Mexico Administrative Code (NMAC). 20.6.2.3103. Title 20 Environmental Protection.Chapter 6. Water Quality. Part 2. Ground and Surface Water Protection. 20.6.2.3103.Standards for Ground Water of 10,000 mg/l TDS Concentration or Less.

NationView|Bhate 2011. Basewide Background Study Report, Holloman Air Force Base, NewMexico. July.

North Wind, Inc. 2011. Accelerated Corrective Measures (ACM) Completion Report for SS-13,Holloman Air Force Base, New Mexico. December.

NMED. 2013. Disapproval Letter, ACM Completion Report, Site SS-13 (October 1, 2013).

NMED. 2011. Partial Approval, Final Basewide Background Study Report Holloman AFB,January 2009 (August 12, 2011).


Table

Table 1 – Summary of SS-13 Analytical ResultsHolloman AFB, NM

SS013-MW01Field Sample ID GroundwaterDate Collected StandardAnalyte Standard Source Result Qualifier Result QualifierTotal Dissolved Solids mg/L 10000 NMWQCC 5150 7100Arsenic, total mg/L 0.01 USEPA 0.0125 J 0.0074Arsenic, dissolved mg/L 0.1 NMWQCC na 0.00658

SS013-MW02Field Sample ID GroundwaterDate Collected StandardAnalyte Standard Source Result Qualifier Result QualifierTotal Dissolved Solids mg/L 10000 NMWQCC 8630 6600Arsenic, total mg/L 0.01 USEPA 0.0508 0.012Arsenic, dissolved mg/L 0.1 NMWQCC na 0.011

SS013-MW04SField Sample ID GroundwaterDate Collected StandardAnalyte Standard Source Result Qualifier Result QualifierTotal Dissolved Solids mg/L 10000 NMWQCC 6900 6200Arsenic, total mg/L 0.01 USEPA 0.0294 0.0071Arsenic, dissolved mg/L 0.1 NMWQCC na 0.0069

SS013-MW04DField Sample ID GroundwaterDate Collected StandardAnalyte Standard Source Result Qualifier Result QualifierTotal Dissolved Solids mg/L 10000 NMWQCC 22700 29000Arsenic, total mg/L 0.01 USEPA 0.0342 J 0.037Arsenic, dissolved mg/L 0.1 NMWQCC na 0.034

Notes:Bold values indicate analytical results above the associated standards.mg/L = milligrams per literna = Not Applicable

USEPA = United States Environmental Protection Agency; USEPA Maximum Contaminant Level for Drinking Water (USEPA 2013)

Qualifiers:J = Estimated Result. Result is less than the RL.

NMWQCC = New Mexico Water Quality Control Commision; NMAC 20.6.2.3103-Domestic & Agricultural water; New Mexico Human Health Standards,Other Standards for Domestic Water Supply, and Agricultural Standards (NMAC 2013)

UnitsGroundwater

HAFB-MW1 H-SS013-MW01-NT012/23/2009 7/22/2015

UnitsGroundwater

HAFB-MW2 H-SS013-MW02-NT012/23/2009 7/22/2015

UnitsGroundwater

HAFB-MW4S H-SS013-MW04S-NT012/23/2009 7/22/2015

UnitsGroundwater

HAFB-MW4D H-SS013-MW04D-NT012/24/2009 7/22/2015


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0 7,000

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DesignedDrawn

Project Number

LED

23446543

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1 inch = 7,000 feet

Legend#* Base Feature

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October 29, 2015

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Notes:SS13-MW04S screened interval 6.0 - 11.0 ftbgs,SS13-MW04D screened interval 17.0 - 27.0 ftbgs.

Sources:HAFB, CBI, ULS Services Corp.Coordinate System:NAD 1983 State Plane, New Mexico Central Zone,Feet 1 inch = 40 feet

Legend

!A Monitor Well

!A Abandoned Monitor Well (2009)

!. Soil Boring (2009)

Groundwater Flow Direction July 2015

Potentiometric Surface Contour July 2015

dashed where inferred

! UST Site

Building

Road Centerline

Electrical Cable Line

Natural Gas Line

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October 29, 2015

0 4010 20 30


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Figure 3SS-13

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mg/L = milligrams per literNotes:1) USEPA Drinking Water Standard (2013) for Total Arsenic in Water: 0.01 mg/L2) SS13-MW04S screened interval 6.0 - 11.0 ftbgs, SS13-MW04D screened interval 17.0 - 27.0 ftbgs,Sources:HAFB, CBI, ULS Services Corp.Coordinate System:NAD 1983 State Plane, New Mexico Central Zone, Feet 1 inch = 40 feet

Legend

!A Monitor Well

!A Abandoned Monitor Well (2009)

Total Arsenic Concentration (mg/L)

0.01

0.025

Dashed where inferred

! UST Site

Building

Road Centerline

Electrical Cable Line

Natural Gas Line

Storm Sewer Line

Wastewater Line

Water Line SS13-MW01Arsenic (Total) 0.0074 mg/LArsenic (Dissolved) 0.00658 mg/L

SS13-MW02Arsenic (Total) 0.012 mg/LArsenic (Dissolved) 0.011 mg/L

SS13-MW04SArsenic (Total) 0.0071 mg/LArsenic (Dissolved) 0.0069 mg/L

SS13-MW04DArsenic (Total) 0.037 mg/LArsenic (Dissolved) 0.034 mg/L

October 26, 2015Holloman Air Force Base

USAF

DesignedDrawn

Project Number

LED

23446543

Figure 4SS-13

Location of BackgroundWell S10-MW4

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!A

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Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/AirbusDS, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, andthe GIS User Community

0 500

Scale in Feet1 inch = 600 feet

Sources:HAFB, CBI, ULS Services Corp.Coordinate System:NAD 1983 State Plane, New Mexico Central Zone, Feet

µ

Legend") Site

!A Background Well

Groundwater Flow Direction July 2015


Attachment 1

Field Sample Collection Logs


Attachment 2

Figures 5-89 and 5-122Base-wide Background Study Report

(NationView|Bhate 2011)

Documents

KU SMAK.A DAM .M. ~:;:,~b - hwbdocuments.env.nm.gov AFB/2015-11-02 Final... · DEPARTMENT OF THE AIR FORCE HEADQUARTERS 49TH WING (ACC) HOLLOMAN AIR FORCE BASE NEW MEXICO ADAM M