B.08 GFI JBC_XE006 SWMU 20 2022 Annual LUC Report Rev1 Changed Pages.pdf

Draft 2022 Annual LUC Inspection Report

Solid Waste Management Unit 20 (XE006)

PERFORMANCE-BASED REMEDIATION

Joint Base Charleston Weapons

SOUTH CAROLINA

Contract FA8903-15-C-0016 September October 2022

Revision 010

Prepared for:

AFCEC/CZRE

US Air Force Civil Engineer Center 772nd ESS/PKS

2261 Hughes Avenue, Suite 155 JBSA Lackland, TX 78236-9853

Prepared by:

Bay West LLC 5 Empire Drive

St. Paul, MN 55103-1867

(651) 291-0456

With Teaming Partners:

SWMU 20 (XE006) Annual LUC Report 2022 Land Use Control Monitoring

Joint Base Charleston Weapons, South Carolina

Contract FA8903-15-C-0016 Page 3 of 5 BWJ140078 transported off-site in fall 2022. Solid waste generated during sampling activities (i.e., personal protective equipment such as sampling gloves) was collected and disposed of as general refuse.

3.0 2022 GROUNDWATER MONITORING RESULTS

2,4,6-Trinitrotoluene was detected in the duplicate sample collected from 20MW03 at a concentration of 0.5798 J micrograms per liter (µg/L). It was not detected in the parent sample.

This detection did not exceed the PAL of 2.5 µg/L.

1,3-Dinitrobenzene, 2,4-dinitrotoluene, 2,6-dinitrotoluene, nitrobenzene, and cadmium were not detected in exceedance of laboratory detection limits at any of the wells sampled in April 2022.

3.1 Data Quality Evaluation

All data generated by the laboratory were validated. Initial and continuing calibrations, surrogates, internal standards, quality control (QC) blanks, laboratory control sample (LCS)/laboratory control sample duplicate (LCSD), MS/MSD, and field duplicates (as applicable) percent recoveries or relative percent difference (RPDs)/relative standard deviations (RSDs) demonstrated an overall acceptable level of accuracy and precision was achieved, as applicable. In addition, completeness, defined to be the percentage of analytical results to be usable, including estimated values, was 100 percent for noted sample delivery group. All validation elements were acceptable and the data, as qualified, are acceptable for their intended use.

A summary of all monitoring results is included as Table 3. Laboratory reports and data validation reports are included as Attachment 3 and Attachment 4, respectively.

4.0 CONCLUSIONS AND RECOMMENDATIONS

The purpose of annual groundwater monitoring and LUC inspections at SWMU 20 is to comply with the requirements of the RCRA Permit. Three groundwater monitoring wells were sampled for cadmium and explosives in April 2022, and the annual LUC inspection was completed on April 14, 2022. Groundwater results did not exceed PALs for explosives in any of the wells sampled.

Cadmium was not detected in any of the wells sampled. No issues or unauthorized well installations were noted during the LUC inspection. The LUCs are functioning as designed. Bay West recommends continuing annual LUC inspections and groundwater monitoring in 2023 as was conducted in 2022.

5.0 REFERENCES

Bay West, 2016. Post-Closure Care and medium-specific UFP-QAPP Performance-Based Remediation, Basewide Groundwater, Surface Water, and Land Use Control Monitoring, Joint Base Charleston Weapons, SC. March.

Bay West, 2018. Statement of Basis for Land Use Controls, Solid Waste Management Unit 20 (XE006), South Annex Munitions Washout. Final. April.

URS, 2016. Remedial Investigation/Feasibility Study SWMU 20, SWMU 22, SWMU 79, SWMU 81, SWMU 82, AOC L, and AOC N, Joint Base Charleston-Weapons.

U.S. Army Corps of Engineers (USACE), 2005. EM200-1-10 Guidance for Evaluating Performance-Based Chemical Data, June.

SWMU 20 (XE006) Annual LUC Report 2022 Land Use Control Monitoring

Joint Base Charleston Weapons, South Carolina

Contract FA8903-15-C-0016 Page 4 of 5 BWJ140078

U.S. Department of Defense (DoD) and Department of Energy (DOE), 2019. DoD/DOE Consolidated Quality Systems Manual for Environmental Laboratories, v 5.0, May 2019 (DoD/DOE, 2019) (PDF 419).

U.S. Department of Defense (DoD) and Department of Energy (DOE), 2021. DoD/DOE Consolidated Quality Systems Manual for Environmental Laboratories, Version 5.4, Oct 2021.

DoD, 2019. DoD General Data Validation Guidelines, Environmental Data Quality Workgroup, November 11, 2019.

Table 1: SWMU 20 Monitoring Well Information and Gauging Data, April 2022 SWMU 20 (XE006) 2022 LUC Inspection Report

Joint Base Charleston, South Carolina

Monitoring Well Identification Number

State Plane

Northing

(NAD 83,

feet)

State Plane

Easting

(NAD 83,

feet)

Well Diameter (inches)

Depth to Top of Screen

(feet bgs)

Depth to Bottom of

Screen (feet bgs)

Total Depth

(ft BTOC)

Top of Casing

Elevation (ft amsl)

Depth to Water 14 April 2022

(ft BTOC)

Groundwater Elevations

14 April 2022 (ft amsl)

20MW01 397207.37 2317309.1 2 15 25 28.00 7.39 5.38 2.01

20MW02 397142.47 2317236.1 2 15 25 27.54 8.41 6.33 2.08

20MW03 397016.01 2317209.5 2 13.5 23.5 26.42 8.82 5.63 3.19

Notes:

amsl = above mean sea level bgs = below ground surface BTOC = below top of casing ERPIMS = Air Force Environmental Resources Program Information Management System ft = feet NAD = North American Datum

Table 3: SWMU 20 Groundwater Monitoring Results, April 2022 SWMU 20 (XE006) 2022 LUC Inspection Report

Joint Base Charleston, South Carolina

20MW01 20MW02 20MW03 20MW03

N N N FD

20-20MW01-01 20-20MW02-02 20-20MW03-03 20-20MW03-03-D

4/14/2022 4/14/2022 4/14/2022 4/14/2022

Analyte RSL MCL PAL MDL

Cadmium 9.2 5.0 5.0 0.25 < 0.50 U < 0.50 U < 0.50 U < 0.50 U Explosives, µg/L (SW-846 8330A) 1,3-Dinitrobenzene 2 NA 2 0.045 < 0.50 U < 0.50 U < 0.50 U < 0.50 U 2,4,6-Trinitrotoluene 2.5 NA 2.5 0.064 < 0.50 U < 0.50 U < 0.50 U 0.579 J 2,4-Dinitrotoluene 0.24 NA 0.24 0.052 < 0.50 U < 0.50 U < 0.50 U < 0.50 U 2,6-Dinitrotoluene 0.049 NA 0.049 0.056 < 0.50 U < 0.50 U < 0.50 U < 0.50 U Nitrobenzene 0.14 NA 0.14 0.071 < 0.50 U < 0.50 U < 0.50 U < 0.50 U Notes:

Bolded values indicate detected analyte < = value was not detected above the Limit of Detection (LOD) FD = field duplicate sample MCL = U.S. EPA Maximum Contaminant Level, May 2018 MDL = method detection limit (minimum value is shown, may be higher for dilutions) N = normal sample NA = Not Applicable PAL = project action level RSL = U.S. EPA Regional Screening Level for tap water, May 2022 µg/L = micrograms per liter

Data Qualifiers J = estimated value U = non-detect and the associated value is the limit of detection (LOD)

Sample Location:

Sample Type:

Sample Name:

Sample Date:

Total Metals, µg/L (SW-846 6020B)

Site ID/Site Name: SWMU 20 – Joint Base Charleston-Weapons

April 2022 P a g e | 4

Photo Number:

Description:

Looking Northeast into marshy area of

SWMU20.