Figure 5 - Previous Soil and Porewater Sample Locations and Exceedances.pdf

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Attached to
RFP 250000002 - Data Gap Analysis for Savoonga FSA
Solicitation number
RFP 250000002 - Data Gap Analysis for Savoonga FSA
Issued by
Nome Census Area, Alaska

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This document is a figure depicting previous soil and porewater sample locations and exceedances at the National Guard Federal Scout Armory in Savoonga, Alaska. The figure shows the locations of monitoring wells, soil and porewater sample points, and identifies areas where diesel-range organics (DRO), benzene, toluene, ethylbenzene, xylenes (BTEX), naphthalene, 1-methylnaphthalene, and 2-methylnaphthalene exceed the Alaska Department of Environmental Conservation (ADEC) alternative cleanup levels. Several historical aboveground storage tanks and other structures are also shown on the figure. The document provides details on the sampling locations, analytes, and exceedances observed, as well as the vertical and horizontal datums used.

The figure appears to be part of a broader remedial action report for the National Guard Federal Scout Armory site, which is likely being addressed through a state and/or local environmental cleanup contract. The document provides technical information to support the ongoing environmental assessment and remediation activities at the site.

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Figure 4 - Savoonga Conceptual Hydrology Model.pdf PDF
Amendment 1 to RFP 250000002.pdf PDF
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Figure 6 - 2022 Remedial Action Analytical Results.pdf PDF
RFP 250000002 - Data Gap Analysis for Savoonga FSA.pdf PDF
Amendment 2 to RFP 250000002.pdf PDF
Figure 5 - Previous Soil and Porewater Sample Locations and Exceedances.pdf PDF
Figure 4 - Savoonga Conceptual Hydrology Model.pdf PDF
Figure 5 - Previous Soil and Porewater Sample Locations and Exceedances.pdf PDF
Final_AKARNG SAV RA Report.pdf PDF
Amendment 1 to RFP 250000002.pdf PDF
Figure 6 - 2022 Remedial Action Analytical Results.pdf PDF
RFP 250000002 - Data Gap Analysis for Savoonga FSA.pdf PDF
Figure 4 - Savoonga Conceptual Hydrology Model.pdf PDF
Figure 6 - 2022 Remedial Action Analytical Results.pdf PDF
RFP 250000002 - Data Gap Analysis for Savoonga FSA.pdf PDF
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MW-02

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SAV-ACL-016

11SAVSB007

A! SAV-ACL-015

Former 3,000-gallon AST Removed in 1993

1,500-gallon AST

1,500-gallon AST

Former 3,000-gallon AST Removed in 2002

1,500-gallon

AST

Former Hazardous

Material Storage Locker

Day Tank

Day Tank

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B-04

B-05

B-06

B-07

B-14

B-15

B-17

B-18

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SAV-ACL-010

SAV-ACL-011

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09SAV-01-D115

09SAV-01-E105

09SAV-01-E115

09SAV-01-F090

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09SAV-01-G090

09SAV-01-G100

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09SAV-01-H100

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09SAV-02-G110

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SAV-ACL-005

SAV-ACL-006

SAV-ACL-007

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SAV-ACL-008B-13

B-10

B-16

New Federal Scout Armory

Old Federal Scout Armory

Walkway

Former Shed

Former Storage Van

Ramp

6/30/2023

DATE: FIGURE:

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PROJECT No.:

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LEGEND:

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Day Tank

Old FSRC

Federal Scout Readiness Center (FSRC)

Former AST

Former Structures

Gravel Pad

Unpaved Road

Former Drum Location%

Other Building

Tank Piping

VERTICAL DATUM: NAVD88

ALASKA STATE PLANE ZONE 9

HORIZONTAL DATUM: NAD83 (2011)

Monitoring Well Locations Installed/Sampled in 2016

One or more result greater than Table C cleanup level?

All results less than Table C cleanup levels?

Chemistry Notes:

1. J = estimated; the value is greater than or equal to the MDL and less than the LOQ, or the quantitation is an estimation due to discrepancies in meeting certain analyte-specific QC criteria

2. (+) = indicates that the result is potentially biased high

3. (–) = indicates that the result is potentially biased low

Abbreviations:

aboveground storage tank below ground surface diesel-range organics milligrams per kilogram milligrams per Liter residual range organics

AST

bgs

DRO

mg/kg mg/L

RRO

Analyte Alternative Cleanup Level (mg/kg)

DRO 3000

Benzene 0.13 Toluene 47 Ethylbenzene 1.2 Xylenes 13 Naphthalene 0.43 1-Methylnaphthalene 4.9 2-Methylnaphthalene 15

Soil

MW-03 9/6/2016 Units DRO 2.9 mg/L

MW-02 9/5/2016 Units DRO 1.5 J- mg/L Toluene 1.8 J+ mg/L

11SAVSB004 7/24/2011 Units DRO 18 J mg/L

SAV-ACL-016 8/25/2004 Units DRO 4.07 mg/L

MW-04 7/4/2016 Units DRO 2.9 J- mg/L RRO 1.1 J- mg/L Toluene 1.2 J- mg/L

References:

1. Map produced using ESRI ArcMap v. 10.7.1.

2. Base imagery from ESRI (WV02, 50cm, 7/11/2014).

A!

Analyte Table C Cleanup Level (mg/L)

DRO 1.5

RRO 1.1

Benzene 0.0046 Toluene 1.1 Ethylbenzene 0.015 Xylenes 0.19

Porewater

AST

Soil concentrations exceeding ADEC-approved Alternative Cleanup Levels

Soil Sample Location DRO < 250 mg/kg!

DRO ≥ 250 mg/kg, but < 3,000 mg/kg!

DRO ≥ 3,000 mg/kg!

DRO, BTEX, naphthalene, 1-methylnaphthalene, and 2-methylnaphthalene exceed alternative cleanup levels!!

SAV-B-12 9/2/1998 Units Depth (feet bgs) DRO 11,000 mg/kg 0.5-1

SAV-B-13 9/2/1998 Units Depth (feet bgs) DRO 17,000 mg/kg 0-0.5

SAV-ACL-015 8/25/2004 Units DRO 30.2 mg/L Benzene 0.0805 mg/L Ethy lbenzene 0.166 mg/L Xylenes 0.581 mg/L

11SAVSB001 7/6/2011 Units Depth (feet bgs)

DRO 4,300

Benzene 0.27 J Ethylbenzene 11 J Xylenes 50 J Naphthalene 24 1-Methylnaphthalene 30 2-Methylnaphthalene 47

DRO 17,000

Benzene 3 Toluene 160 Ethylbenzene 48 Xylenes 250 Naphthalene 180 1-Methylnaphthalene 230 2-Methylnaphthalene 360 mg/kg mg/kg

1-2

2-2.6

Porewater Sample Location

One or more result greater than Table C cleanup levelA!

All results less than Table C cleanup levelsA!

Property Line

1. Location of historical samples are approximate based on historical figures and on orthophotography courtesy of Alaska Department of Commerce, Division of Community & Regional Affairs (DCRA), 1-foot pixels.

2. All wells established prior to 2016 have been abandoned/removed.

3. Only porewater sample results with Table C exceedances are shown on figure.

4. Property boundary displayed is approximate.

Notes:

NATIONAL GUARD FEDERAL

SCOUT ARMORY

REMEDIAL ACTION REPORT

PREVIOUS SOIL AND POREWATER

SAMPLE LOCATIONS AND

EXCEEDANCES

SAVOONGA, ALASKA

_J

J

D D I. - -

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