Attachment K - REFERENCE -PFAS SI_Site 3_012424.pdf

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"S"S "S

"S "S"S

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"S "S

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"S "S "S

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"S "S

"S

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"S

"S

+U

+U

+U

+U

+U +U+U

+U

+U+U

+U

+U

+U

+U

+U +U+U

+U

+U+U

+U

Little Creek

Channel

JEBLC-MW05

JEBLC-MW14

JEBLC-MW02

JEBLC-MW10

JEBLC-MW11

JEBLC-MW10

1.14

JEBLC-MW11

1.14

LSFS6-MW01

JEBLC-MW05

0.79

JEBLC-MW14

1.27LSFS6-MW03

LSFS6-MW05

JEBLC-MW02

0.62

LSFS6-MW04

LSFS6-MW02

R5 R7

1265-2

1265-4

1621 1506

R4

1166B

1265-1

1265-3

1265-6

1265-8

1265-10

ATTU RD

GATOR BLVD

AM

PH

IB

IO

U S

D R

TARAW

A RD

OAK HILL RD

WHIDBEY ISLAND RD

STALWART RD

SUMTER RD

MIDWAY RD

LA MOURE COUNTY RD

SI

G

N A

L

PO

IN

T

R D

GUADALCANAL

JEBLC-MW-07

(Not Sampled)

PIERS 11-19

– LITTLE

CREEK HARBOR

LSHA-SD07 LSHA-SD08

LSHA-SD06

LSHA-SD04 LSHA-SD05

LSHA-SD03

LSHA-SD01 LSHA-SD02

Pier 11

Pier 12

Pier 13

Pier 14

Pier 15

Pier 16

Pier 17

Pier 18

Pier 19

Figure 4-2 Piers 11-19 – Little Creek Harbor PFAS RSL Exceedances

Per- and Polyfluoroalkyl Substances Site Inspection Report JEB Little Creek

Virginia Beach, Virginia

0 300150

Feet

Legend +U Monitoring Well ")# Sediment Sample

Confirmed PFAS Release Area Installation Area

!= Storm Sewer Inlet

"S Storm Sewer Discharge Culvert Centerline Storm Sewer Line Groundwater Elevation Contour Groundwater Flow Direction

\\dc1vs01\GISNavyClean\MIDLANT\LittleCreek\MapFiles\PFAS\SI-Report\Figure4-2_Piers11-19_LittleCreekHarbor.mxd7/25/2023jcarr3

GW flow direction was obtained from Figure 2-3 of the Preliminary Assessment Documenting Potential Sources of Per- and Polyfluoroalkyl Substances Joint Expeditionary Base Little Creek, Virginia Beach, Virginia (Tetra Tech, 2022).

Notes:

J - Estimated NG/G - Nanograms per gram NG/L - Nanograms per liter R - Unreliable Result U - Nondetect or not detected at significantly greater than that in an associated blank.

UJ - Nondetect, estimated reporting limit.

Bolding indicates detection Shading indicates exceedance of PFAS SLs *- indicates field duplicate (FD) collected at this location; higher (more conservative) value chosen between native parent and FD SS - Surface Soil SB - Subsurface Soil GW - Groundwater SL - Screening Levels

Analyte Ground

Water SLs (ng/L)

Sediment SLs

(ng/g)

PFBS 600 19,000

PFHxS 39 1,300 PFHxA 990 32,000

PFBA 1,800 78,000

PFNA 6 190

PFOS 4 130

PFOA 6 190

SLs based on HQ=0.1

Station ID JEBLC-MW10 Sample ID JEBLC-MW10-1122 Sample Date 11/29/2022 Sample Depth 0-19

PFNA 11

PFOS 20

PFOA 29

Station ID JEBLC-MW02 Sample ID JEBLC-MW02-1122* Sample Date 11/29/2022 Sample Depth 0-14

PFOS 15 J

Station ID JEBLC-MW05 Sample ID JEBLC-MW05-1122 Sample Date 11/29/2022 Sample Depth 0-19

PFOS 63 J

PFOA 10

Station ID JEBLC-MW11 Sample ID JEBLC-MW11-1122 Sample Date 11/29/2022 Sample Depth 5-15 PFHxS 290

PFNA 19

PFOS 180

PFOA 66

Station ID JEBLC-MW14 Sample ID JEBLC-MW14-1122 Sample Date 11/29/2022 Sample Depth 5-15

PFOS 28 J

PFOA 48 J

INTERNAL DELIBERATIVE - DO NOT DISTRIBUTE

+U

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+U

+U+U

+U

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+U

LSFS6-MW03

LSFS6-MW05LSFS6-MW04

LSFS6-MW01

LSFS6-MW02

1265-6

AM

PH

IB

IO

U S

DR

GUADALCANAL

LSFS6-MW04

2.17

LSFS6-MW01

2.06

LSFS6-MW02

2.10

LSFS6-MW03

2.05

LSFS6-MW05

1.89

BUILDING

1609 – FIRE

STATION #6

2.

2.

Figure 4-4 Building 1609 – Fire Station #6 PFAS RSL Exceedances Per- and Polyfluoroalkyl Substances Site Inspection Report

JEB Little Creek Virginia Beach, Virginia

0 5025

Feet

Legend +U Monitoring Well

Potential PFAS Release Area Installation Area

!= Storm Sewer Inlet Storm Sewer Line Contour GW Flow

\\dc1vs01\GISNavyClean\MIDLANT\LittleCreek\MapFiles\PFAS\SI-Report\Figure4-4_FireStation6.mxd7/25/2023jcarr3

Notes:

J - Estimated NG/G - Nanograms per gram NG/L - Nanograms per liter R - Unreliable Result U - Nondetect or not detected at significantly greater than that in an associated blank.

UJ - Nondetect, estimated reporting limit.

Bolding indicates detection Shading indicates exceedance of PFAS SLs *- indicates field duplicate (FD) collected at this location; higher (more conservative) value chosen between native parent and FD SS - Surface Soil SB - Subsurface Soil GW - Groundwater SL - Screening Levels

Notes:

Groundwater contours are based on December 2022 sampling event.

Elevations are presented in feet above mean sea level (amsl).

Station ID Sample ID LSFS6-MW01-1222 LSFS6-SS01-000H-1222 LSFS6-SB01-0H02-1222 Sample Date 12/13/2022 12/7/2022 12/7/2022 Sample Depth 5 - 15 ft. bgs 0 - 0.5 ft. bgs 0.5 - 2 ft. bgs PFHxS 980 J 0.4 U 0.43 U

PFNA 9 0.4 U 0.43 U

PFOS 1,400 J 0.4 U 1.9 J

PFOA 66 0.4 U 0.43 U

LSFS6-MW01

Station ID Sample ID LSFS6-MW02-1222 LSFS6-SS02-000H-1222 LSFS6-SB02-0H02-1222 Sample Date 12/13/2022 12/7/2022 12/7/2022 Sample Depth 7 -17 ft. bgs 0 - 0.5 ft. bgs 0.5 - 2 ft. bgs

PFOS 9.3 2 J 0.45 U

LSFS6-MW02

Station ID Sample ID LSFS6-MW03-1222 LSFS6-SS03-000H-1222 LSFS6-SB03-0H02-1222 Sample Date 12/13/2022 12/7/2022 12/7/2022 Sample Depth 10 - 20 ft. bgs 0 - 0.5 ft. bgs 0.5 - 2 ft. bgs PFHxS 320 1.8 J 0.63 J

PFNA 8.7 0.29 J 0.44 U

PFOS 580 8.7 J 0.51 J

PFOA 69 0.44 J 0.44 U

LSFS6-MW03

Station ID Sample ID LSFS6-MW04-1222 LSFS6-SS04-000H-1222* LSFS6-SB04-0H02-1222 Sample Date 12/13/2022 12/7/2022 12/7/2022 Sample Depth 8 - 18 ft. bgs 0 - 0.5 ft. bgs 0.5 - 2 ft. bgs PFHxS 82 J 0.45 U 0.4 U

PFOS 250 J 2.3 0.2 J

PFOA 16 J 0.27 J 0.4 U

LSFS6-MW04

Station ID Sample ID LSFS6-MW05-1222* LSFS6-SS05-000H-1222 LSFS6-SB05-0H02-1222* Sample Date 12/13/2022 12/7/2022 12/7/2022 Sample Depth 5 - 15 ft. bgs 0 - 0.5 ft. bgs 0.5 - 2 ft. bgs PFHxS 1000 J 0.45 J 0.48 U PFHxA 1,700 J 0.52 J 0.48 U

PFNA 74 J 0.25 J 0.48 U

PFOS 3,200 J 5.8 J 0.48 U

PFOA 210 J 0.23 J 0.48 U

LSFS6-MW05

Analyte Soil SLs (ng/g)

Ground Water SLs

(ng/L)

PFBS 1,900 600

PFHxS 130 39 PFHxA 3,200 990

PFNA 19 6

PFOS 13 4

PFOA 19 6

SLs based on HQ=0.1

INTERNAL DELIBERATIVE - DO NOT DISTRIBUTE