JB_CHS_Monitoring_Plan_for_OB_OD_Range.pdf

GROUNDWATER/STORMWATER/SEDIMENT/SURFACE SOIL

MONITORING PLAN

FOR

NORTHSIDE OPEN BURNING/OPEN DETONATION UNIT

(RCRA SUBPART X PERMIT # SC8170022620)

(REVISED)

JOINT BASE CHARLESTON - WEAPONS

CHARLESTON, SOUTH CAROLINA

and

Naval Facilities Engineering Command Southeast

Contract Number N62467-06-D-0125 Contract Task Order 0054

June 2011

REVISION 3

(June 2011) ii

GROUNDWATER/STORMWATER/SEDIMENT/SURFACE SOIL MONITORING PLAN

FOR

NORTHSIDE OPEN BURNING/OPEN DETONATION UNIT

(RCRA SUBPART X PERMIT #SC8170022620)

(REVISED)

AT

Submitted to:

Naval Facilities Engineering Command

Southeast NAS Jacksonville; Bldg. 135 North

P.O. Box 30 Jacksonville, Florida 32212-0030

Submitted by:

ADVENT Environmental, Inc.

498 Wando Park Blvd., Suite 500 Mt. Pleasant, South Carolina 29464

CONTRACT NUMBER N624467-06-D-0125

CONTRACT TASK ORDER 0054

June 2011

PREPARED BY: APPROVED BY:

James W. Weeg, P.G. Todd W. Moody, P.G.

Project Manager Principal ADVENT Environmental, Inc. ADVENT Environmental, Inc.

Mt. Pleasant, South Carolina Mt. Pleasant, South Carolina iii

GROUNDWATER/STORMWATER/SEDIMENT/SURFACE

SOIL MONITORING PLAN

FOR

NORTHSIDE OPEN BURNING/OPEN DETONATION UNIT

(RCRA SUBPART X PERMIT #SC8170022620)

(REVISED)

AT

CONTRACT NUMBER N624467-06-D-0125

CONTRACT TASK ORDER 0054

Points of Contact

Shina Ballard, Code OPA5 NAS Jacksonville; Bldg 135 North P.O. Box 30 Jacksonville, FL 32212-0030

(904) 542-6109 shinna.ballard@navy.mil

Barry Lewis JBC - Weapons Environmental Department (Code 092BL) 2316 Redbank Road, Suite 100 Goose Creek, SC 29445-8601

(843) 764-4010 barry.lewis.02@charleston.af.mil

ADVENT Project Principal Todd W. Moody, P.G.

(843) 388-1851 twmoody@versar.com

ADVENT Project Manager James W. Weeg, P.G.

(843) 388-1851 jwweeg@versar.com

Prepared by:

mailto:shinna.ballard@navy.mil mailto:barry.lewis.02@charleston.af.mil mailto:twmoody@versar.com mailto:jwweeg@versar.com iv

TABLE OF CONTENTS

SECTION PAGE NO.

1.0 INTRODUCTION

1.1 RECORDKEEPING

1.1.1 Field Records

1.1.2 Analytical Records

2.0 INTERIM STATUS GROUNDWATER MONITORING DATA

2.1 GROUNDWATER MONITORING SYSTEM

2.1.1 Field Operations

2.1.2 Interim Status Groundw ater Monitoring and Results

2.2 SURFACE SOIL SAMPLING

2.3 SEDIMENT SAMPLING

2.4 SURFACE WATER SAMPLING

2.5 QUALITY ASSURANCE/QUALITY CONTROL SAMPLES

2.6 ADDITIONAL FIELD DOCUMENTATION

3.0 GENERAL HYDROGEOLOGICAL INFORMATION

3.1 CLIMATE

3.2 TOPOGRAPHY/PHYSIOGRAPHY

3.3 SURFACE WATER DRAINAGE

3.3.1 Base Surface Water Drainage

3.3.2 Northside OB/ OD Range Surface Water Drainage

3.4 GEOLOGY

3.4.1 Regional Geology

3.4.2 Northside OB/ OD Unit Geology

3.5 HYDROGEOLOGY

3.5.1 Hydrogeology of the Surficial Aquifer

3.5.2 Hydrogeology and Water Quality of Deep Aquifer Systems

3.5.3 Northside OB/ OD Unit Hydrogeology

4.0 GROUNDWATER SAMPLING AND ANALYSIS PLAN

4.1 GROUNDWATER SAMPLING AND ANALYSIS PROCEDURES

4.1.1 Inspection of Groundwater Monitoring Wells

4.1.2 Water-Level Measurements

4.1.3 Well Purging

4.1.4 Low -Flow Sampling of Monitoring Wells

4.1.5 Decontamination of Field Sampling Equipment

4.1.6 Investigation-Derived Waste Management

4.1.7 Sample Identification System

4.1.8 Sample Preservation and Handling

4.1.9 Sample Custody and Documentation of Field Activities

4.2 QUALITY ASSURANCE/QUALITY CONTROL SAMPLES

4.2.1 Field Blanks (Source Water Blanks)

v

4.2.2 Field Duplicates

4.2.3 Rinsate B lanks

4.2.4 Trip B lanks

4.2.5 Ambient B lanks

4.2.5 Matrix Spikes/ Duplicates

4.3 FIELD INSTRUMENT CALIBRATION PROCEDURES AND FREQUENCY

4.4 SAMPLING DATA EVALUATION

5.0 STORM WATER SAMPLING AND ANALYSIS PLAN

5.1 STORM WATER BEST MANAGEMENT PRACTICES PLAN

5.1.1 Structural BMPs

5.1.2 Non-Structural BMPs

5.2 STORM WATER MONITORING PLAN

5.2.1 Sampling Rationale/ Frequency/ Analyses

5.2.2 Sampling Locations

5.2.3 Sampling Procedure

5.2.4 Sample Nomenclature

5.2.5 Sample Chain-of-Custody/ Documentation

5.2.6 Sampling Equipment Decontamination

5.2.7 Sampling Data Evaluation

5.2.8 Sample Reporting

6.0 SURFACE WATER AND SEDIMENT MONITORING

6.1 SAMPLING RATIONALE/FREQUENCY/ANALYSES

6.2 SAMPLING LOCATIONS

6.3 SAMPLING PROCEDURES

6.4 INVESTIGATION-DERIVED WASTE MANAGEMENT

6.5 SAMPLE NOMENCLATURE

6.6 SAMPLE CHAIN-OF-CUSTODY/DOCUMENTATION

6.7 SAMPLING EQUIPMENT DECONTAMINATION

6.8 SAMPLE LABELING/HANDLING/SHIPMENT

6.9 SAMPLING DATA EVALUATION

6.10 SAMPLE REPORTING

7.0 SURFACE SOIL MONITORING

7.1 SAMPLING RATIONALE/FREQUENCY/ANALYSES

7.2 SAMPLING LOCATIONS

7.3 SAMPLING PROCEDURES

7.4 INVESTIGATION-DERIVED WASTE MANAGEMENT

7.5 SAMPLE NOMENCLATURE

7.6 SAMPLE CHAIN-OF-CUSTODY/DOCUMENTATION

7.7 SAMPLING EQUIPMENT DECONTAMINATION

7.8 SAMPLE LABELING/HANDLING/SHIPMENT

7.9 SAMPLING DATA EVALUATION

7.10 SAMPLE REPORTING

8.0 AIR QUALITY MONITORING PLAN

vi

9.0 REPORTING REQUIREMENTS

APPENDIX A

APPENDIX B

APPENDIX C

APPENDICES

APPENDIX

A Standard Operating Procedures

B Site-Wide Background Values

C Hydraulic Conductivity Calculations

TABLES

NUMBER

Table 1-1 Site-Wide Sampling Requirements Overview

Table 2-1 Rationale for Temporary Wells/Piezometers

Table 2-2 Temporary Wells/Piezometers

Table 2-3 Groundwater Elevations – Rounds 1-4

Table 2-4 Descriptive Statistics for Groundwater

Table 2-5 Summary of Positive Detections in Groundwater

Table 2-6 Summary of Positive Detections in Surface Soil Samples

Table 2-7 Summary of Positive Detections in Sediment Samples

Table 2-8 Summary of Positive Detections in Surface Water Samples

Table 3-1 Climatic Conditions

Table 3-2 Summary of Hydraulic Conductivity Test Results

Table 4-1 Summary of Aqueous Sample Analyses (Groundwater)

Table 4-2 Summary of Sample Analysis and Quality Control Samples (Groundwater)

Table 5-1 Summary of Aqueous Sample Analyses (Storm Water)

Table 5-2 Summary of Sample Analysis (Storm Water)

Table 6-1 Summary of Sediment and Aqueous Sample Analyses (Surface Water and

Sediment) vii

TABLES (Continued)

Table 6-2 Summary of Aqueous Sample Analyses (Surface Water and Sediment, Bi-annual requirements)

Table 6-3 Summary of Sample Analysis (Surface Water)

Table 6-4 Summary of Sample Analysis (Sediment)

Table 7-1 Summary of Soil Sample Analyses (Surface Soil)

Table 7-2 Summary of Soil Sample Analysis (Surface Soil)

FIGURES

NUMBER

Figure 1-1 Waste Management Unit Boundary Map

Figure 1-2 Point of Compliance Boundary Map

Figure 2-1 Sample Location Map

Figure 3-1 Northside OB/OD Unit Location Map

Figure 3-2 Physiographic Provinces of South Carolina

Figure 3-3 Northside OB/OD Unit Site Features and Drainage

Figure 3-4 Generalized Geologic Cross-Section Transecting from Columbia to Charleston, South Carolina

Figure 3-5 Geologic Cross Section Location Map

Figure 3-6 Geologic Cross Section A-A’

Figure 3-7 Geologic Cross Section B-B’

Figure 3-8 Potentiometric Surface Map (March 20, 2000)

Figure 3-9 Potentiometric Surface Map (July 5, 2000)

Figure 3-10 Potentiometric Surface Map (October 3, 2000)

Figure 3-11 Potentiometric Surface Map (January 10, 2001)

Figure 4-1 Groundwater Sample Map

Figure 5-1 Storm Water Sample Map

Figure 6-1 Surface Water/Sediment Sample Map

Figure 7-1 Surface Soil Sample Map viii

ACRONYMS

µg/kg Micrograms per Kilogram µg/L Micrograms per Liter bgs Below Ground Surface

BMP Best Management Practice

BOS Bottom of Screen

BTEX Benzene, Toluene, Ethylbenzene, Xylenes

COC Chain of Custody

DOD Department of Defense

DTB Depth to Base

DTW Depth to Water

EOD Explosive Ordnance Disposal

FOL Field Operations Leader gpm Gallons per Minute

HMX Cyclotetramethylene – tetranitramine i Hydraulic Gradient

IDW Investigation Derived Waste

JB CHS-W Joint Base Charleston – Weapons k Hydraulic Conductivity

MCL Maximum Contaminant Level

MP Monitoring Plan

MS/MSD Matrix Spike/Matrix Spike Duplicate

NAD North American Datum

NAVFAC Naval Facilities Engineering Command – Southeast ne The Effective Porosity

NGVD National Geodetic Vertical Datum

NTU Nephelometric Turbidity Unit

OB/OD Open Burning/Open Detonation

POMFLANT Polaris Missile Facility, U.S. Atlantic Fleet

PID Photo-Ionization Detector

PPE Personnel Protective Equipment psi Pounds per Square Inch

PVC Polyvinylchloride

QA/QC Quality Assurance/Quality Control

RCRA Resource Conservation and Recovery Act ix

ACRONYMS (Continued)

RDX Cyclonite-hexahydro-trinitro-triazine

RSL Regional Screening Level

SCDHEC South Carolina Department of Health and Environmental Control

SOP Standard Operating Procedure

SVOC Semi-Volatile Organic Compound

SWMU Solid Waste Management Unit

TAL Target Analyte List

TOC Top of Casing

TOS Top of Screen

TNT Trinitrotoluene

TPH Total Petroleum Hydrocarbons

US EPA United States Environmental Protection Agency

USGS United States Geologic Survey

UTL Upper Tolerance Limit

Va Linear Velocity of Groundwater

VOC Volatile Organic Compound

1(R-5/29/12)

1.0 INTRODUCTION

This monitoring plan (MP) for the Joint Base Charleston – Weapons (JB CHS-Weapons), South Carolina, was prepared for the U.S. Department of the Navy (Navy) by ADVENT Environmental, Inc. (ADVENT) under the Naval Facilities Engineering Command-Southeast (NAVFAC) contract, Contract Number

N62467-06-D-0125, Contract Task Order 0054.

This MP outlines the overall scope of the monitoring program to be conducted in accordance with the

Resource Conservation and Recovery Act (RCRA) Part B and Subpart X Permit (#SC8170022620) issued by the South Carolina Department of Health and Environmental Control (SCDHEC) to JB CHS-Weapons, located in Charleston, South Carolina. Sections VI.H of the Resource Conservation and Recovery Act

(RCRA) permit issued by SCDHEC contains monitoring requirements for the Northside Open

Burning/Open Detonation (OB/OD) Unit. Section VI.H.1 describes requirements for groundwater monitoring. Section VI.H.2 describes requirements for air quality monitoring. Section VI.H.3 describes requirement for surface water and sediment monitoring. Section VI.H.4 describes requirements for soil monitoring. Section VI.C.2(b) describes requirements for a storm water management sampling and analysis plan. This MP describes monitoring of groundwater, surface soils, sediments, and surface waters to determine the levels of contaminants, if any, in groundwater, soil, sediment, and surface water at the

OB/OD range. The data collected in these monitoring activities will be used to determine if explosive and metal contaminants are present in the media and if environmental resources are being adversely impacted as a result of operations at the Northside OB/OD Unit. Table 1-1 provides a site-wide overview of the sampling requirements, by media, for the site. Figure 1-1 shows the Northside OB/OD Unit’s waste management unit boundary and sample locations which are discussed in this plan. Figure 1-2 shows the

Northside OB/OD Unit’s point of compliance boundary.

1.1 RECORDKEEPING

JB CHS-Weapons is required to keep records of all monitoring data. Records of all monitoring at the

OB/OD Unit will be maintained at a central recordkeeping repository at JB CHS-Weapons. Following is a description of the records that will be kept.

1.1.1 Field Records

Field records will include the following:

• Field notebooks

• Logbooks

• Chain-of-custody receipts

• Sample log sheets

• Sample forms

1.1.2 Analytical Records

Analytical Records will include the following:

• Analytical data (hardcopy and electronic)

• Data validation letters.

TABLE 1-1

SITE-WIDE SAMPLING REQUIREMENTS OVERVIEW

Parameter Analytical Methodology

Sampling Interval

Groundwater Sampling Requirements Laboratory Explosives (all explosives except nitroglycerin and nitrocellulose) SW-846 Method 8330 Semi-Annual

Nitroglycerin SW-846 Method 8332 Semi-Annual

TAL Metals SW-846 Method 6010B trace or 6020;

mercury - SW-846 Method 7470A Semi-Annual

Cyanide SW-846 Method 9010B or 9012A Semi-Annual Sulfide SW-846 Method 9030B/9034 Semi-Annual Perchlorate SW-846 Method 9030B/9035 Semi-Annual

Field Parameters pH Horiba U-52 (or similar device) Semi-Annual Specific Conductance Horiba U-52 (or similar device) Semi-Annual Temperature Horiba U-52 (or similar device) Semi-Annual Turbidity Horiba U-52 (or similar device) Semi-Annual ORP Horiba U-52 (or similar device) Semi-Annual Water Level Solinst 122 IP (or similar device) Semi-Annual Salinity Horiba U-52 (or similar device) Semi-Annual

Storm Water Sampling Requirements Explosives (HMX, RDX, and TNT) SW-846 Method 8330 Semi-Annual

Metals (antimony, barium, chromium, copper, lead, nickel, and zinc)

SW-846 Method 6010B trace or 6020 Semi-Annual

Sediment/Surface Water Sampling Requirements Sediment Samples

Explosives (HMX, RDX, TNT) SW-846 Method 8330 Semi-Annual

Metals (Barium, Antimony, Chromium, Copper, Lead, Nickel, and Zinc) SW-846 Method 6020

Semi-Annual

BTEX VOCs (Benzene, Toluene, Ethylbenzene, Total Xylenes) SW-846 Method 8021

Bi-Annual

Total Explosives (HMX, RDX, 1,3,5-TNB, 1,3- DNB, Tetryl, NB, 2,4,6-TNT, 4-Am-DNT, 2-Am- DNT, 2,4-DNT, 2,6-DNT, 2-NT, 3-NT, and 4-NT)

SW-846 Method 8330 Bi-Annual

Total Petroleum Hydrocarbons (Gasoline Range Organics and Diesel Range Organics)

SW-846 Method 8015M Bi-Annual

Surface Water Samples

BTEX VOCs (Benzene, Toluene, Ethylbenzene, Total Xylenes)

SW-846 Method 8021 Bi-Annual

4 (R-5/29/12)

TABLE 1-1 (Continued)

SITE-WIDE SAMPLING REQUIREMENTS OVERVIEW

Parameter Analytical Methodology Sampling Interval

Surface Soil Sampling Requirements Explosives (HMX, RDX, TNT) SW-846 Method 8330 Semi-Annual

Metals (Barium, Antimony, Chromium, Copper, Lead, Nickel, and Zinc)

SW-846 Method 6020 Semi-Annual

BTEX VOCs (Benzene, Toluene, Ethylbenzene, Total Xylenes)

SW-846 Method 8021 Bi-Annual

Total Explosives (HMX, RDX, 1,3,5-TNB, 1,3- DNB, Tetryl, NB, 2,4,6-TNT, 4-Am-DNT, 2-Am- DNT, 2,4-DNT, 2,6-DNT, 2-NT, 3-NT, and 4-NT)

SW-846 Method 8330 Bi-Annual

Total Petroleum Hydrocarbons -Gasoline Range Organics and Diesel Range Organics (Reported as separate constituents).

SW-846 Method 8015M Bi-Annual

Detention Basin

Waste Management Unit Boundary

StormWater Outlet

StormWater Inlet

Scrap/Trash Storage

Drainage Swale

Bunker

43SS28 43SS27

43SS26

43SS29

LC Bunker

Gate

Main Entrance

43SD09

43SD08

43MW06

43MW05

43MW04

43MW03

43MW01

43SW03/43SD06

43SW02/43SD05

43DP01/43SD07

J Weeg 05/03/11 C Slayden 05/03/11

Scale 1:1,250 File Name fig_1_1_wmu_map Created by Checked by Revision

Created for

Jacksonville, FL Contract No. N62467-06-D-0125 Task Order 0054 Created by

Mt. Pleasant, SC Project No. 810005.0054 Date 05/03/11 Title Waste Management Unit Boundary Project SWMU 43 Multi-Media Sampling

Plan Facility Joint Base Charleston-Weapons

Location Goose Creek, SC

Sheet I.D.

Figure 1-1Source: South Carolina GIS Data CLearinghouse and JB CHS-Weapons

0 50 100 150 20025 Feet

Legend Monitoring Well Sediment Sample Water/Sed Sample Tree Line Waterway Soil Sample Areas

Crew Shelter Paper/Plastic Dumpster Gate Last Chance Shelter Metallic Debris Roll-Off MEC Storage Elevation Contour

Point of Compliance Boundary

StormWater Outlet

StormWater Inlet

Scrap/Trash Storage

Drainage Swale

Bunker

43SS28 43SS27

43SS26

43SS29

LC Bunker

Gate

Main Entrance

43MW06

43SW03/43SD06

43SW02/43SD05

43MW01

43MW03

43MW04

43MW05

43SD09

43SD08

43DP01/43SD07

35 20

J Weeg 05/25/11 C Slayden 05/25/11

Scale 1:1,250 File Name fig_1_2_poc_map Created by Checked by Revision

Created for

Jacksonville, FL Contract No. N62467-06-D-0125 Task Order 0054 Created by

Mt. Pleasant, SC Project No. 810005.0054 Date 05/03/11 Title SWMU 43 Point of Compliance

Boundary Map Project SWMU 43 Multi-Media Sampling Facility Joint Base Charleston-Weapons Location

Goose Creek, SC Sheet I.D.

Figure 1-2Source: South Carolina GIS Data CLearinghouse and JB CHS-Weapons

0 50 100 150 20025 Feet

Legend Monitoring Well Sediment Sample Water/Sed Sample Tree Line Waterway Soil Sample Areas

Crew Shelter Paper/Plastic Dumpster Gate Last Chance Shelter Metallic Debris Roll-Off

Elevation Contour

5 (R-5/29/12)

2.0 INTERIM STATUS GROUNDWATER MONITORING DATA

Interim status groundwater monitoring was conducted at JB CHS-Weapons Northside OB/OD Unit from

March 1999 to January 2000. Baseline environmental soil, sediment, and surface water monitoring was also conducted during March 2000. Monitoring well installation procedures and groundwater, soil, sediment, and surface water monitoring sampling and analyses procedures were reviewed and approved by SCDHEC. Section 4.0 of this plan contains the general groundwater sampling analyses and documentation procedures that were followed for interim status groundwater monitoring. These general procedures will also be followed for groundwater monitoring during the operating life of the Northside

OB/OD unit. Section 6.0 describes the surface water and sediment monitoring program. Section 7.0 describes the surface soil monitoring program. The remainder of this section describes the interim status groundwater monitoring activities and results and baseline soil, sediment, and surface water monitoring activities and results.

Five groundwater monitoring wells were installed at the Northside OB/OD Unit to monitor current groundwater conditions. These wells were installed during the field investigation completed as part of the initial groundwater investigation for the Northside OB/OD.

Eight temporary wells, two temporary piezometers, and two staff gauges were initially installed at the site. Information collected from the temporary wells and piezometers was used to determine the groundwater flow direction. All wells and piezometers were surveyed and water-level measurements were collected within 3 days of the last temporary well installation. The rationale for each temporary well and piezometer location is provided in Table 2-1. Refer to Figure 2-1 for well locations.

A potentiometric surface map was developed from the initial water-level measurements that were collected. Based on the interpretation of the potentiometric surface, a decision was made by the Navy and SCDHEC to make certain temporary wells and piezometers permanent. Four downgradient temporary wells (43TW03, 43TW04, 43TW05, and 43TW06) were converted to permanent monitoring wells at the point-of-compliance (See Figure 1-2 for Point-of-Compliance boundary). One temporary well

(43TW01) was drilled to the confining unit to establish its depth. Groundwater information collected from the piezometers was used to interpret the initial water-table surface and hydraulic gradients at the site for optimal selection of monitoring wells for future sampling. A summary of the well and piezometer information obtained for each temporary well and piezometer is provided in Table 2-2.

6 (R-5/29/12)

After the temporary monitoring wells were completed as permanent wells and had been properly developed, the monitoring wells were sampled quarterly for 1 year. The groundwater samples were analyzed for Appendix IX metals plus cyanide, SW-846 method 8330 explosives, nitrocellulose, and nitroglycerin. One groundwater sample collected during the initial round from a downgradient location was analyzed for all RCRA Appendix IX constituents. Results of the groundwater samples were compared to base wide groundwater background values following the procedures for determining statistically significant increases in downgradient wells, described in Section 2.1.2.1 of this plan. Analytical results for groundwater are discussed in Section 2.1.2. Section 2.4 contains the results of the statistical evaluation as well as recommendations regarding the type of monitoring program.

2.1 GROUNDWATER MONITORING SYSTEM

2.1.1 Field Operations

2.1.1.1 Temporary Well/Piezometer Installation

The temporary wells and piezometers were installed by the following method:

Nine temporary monitoring wells (43TW01 through 43TW04, 43TW04A, and 43TW05 through 43TW08) and two temporary piezometers (43PZ01 and 43PZ02) were installed to depths of 15 to 18 feet bgs. The temporary wells and piezometers were installed using hollow-stem auger drilling methods. Soil samples were collected continuously at 2-foot intervals using split-spoon samplers. The soil samples were used for lithologic characterization and record on boring logs (boring logs can be found in Appendix 2-2 of

RCRA Subpart X Permit Application for the Northside OB/OD Unit, Volume II of III – Groundwater

Monitoring Plan [January 2003]). Collected soils were monitored for volatile organic compounds (VOCs) using a photoionization detector (PID) and visually examined for the presence of soil staining. No elevated PID or stained soils were observed in the samples or drill cuttings. No samples from the temporary monitoring wells or piezometers were collected for chemical laboratory analysis.

The soil boring, 43SB01, adjacent to temporary well 43TW01, was advanced to the top of the Ashley

Formation of the Cooper Group. Split spoon samples were collected continuously every 2 feet to the boring termination. The Ashley Formation was encountered at a depth of 25 feet bgs.

2.1.1.2 Staff Gauge Installation

Two staff gauges (43SG01 and 43SG02) were installed at locations shown on Figure 2-1. Staff gauge

43SG01 was installed in standing water north of the access road that extends east of the Northside

OB/OD Unit. Surface water from the OB/OD Unit drains along the swaled located east and north of the site. The construction of the access road resulted in damming the surface water flow south along the northeastern swale. Water flow along the swale drains slowly southward past the access road but drainage is insufficient to prevent standing water on the northern part of the swale. Standing water in this area extends from the road at staff gauge 43SG01 north of the road along the eastern boundary of the Northside OB/OD Unit. The water follows along the swale northward and then drains westward in the area of 43MW03. Staff gauge 43SG02 was located along the southern drainage of the site draining the south central portion of the site. The staff gauges were used to measure surface water elevation at the site during the baseline sampling period.

2.1.1.3 Surveying of Temporary Well Points and Piezometers

Temporary monitoring wells and piezometers, staff gauges, soil borings, and sediment, surface water, and surface soil sample locations were surveyed by a South Carolina Licensed Professional Surveyor.

Additional points were surveyed, such as the corners of site structures, culvers, and on-site drainage features located at the site, to establish the site map. Two permanent concrete monuments were installed to establish site control. The concrete monuments have plaques containing the northing, easting, and ground surface elevations at each location. The northing and easting coordinates are tied into the South Carolina State Plane Coordinate System.

The 1927 North American Datum (NAD) was used as the datum. Horizontal locations of the soil borings, wells, and piezometers were surveyed to JB CHS-Weapons coordinates, which are tied to the South

Carolina State Plane Coordinate System. Sample locations were surveyed to the nearest 0.10 foot.

Vertical elevations were also referenced to the 1929 National Geodetic Vertical Datum (NGVD).

Elevations for the wells and piezometers were determined at the measuring point where the uncapped

PVC well riser pipe was notched and also at the top of the protective casing, to the nearest 0.10 foot.

For all sample locations, including wells and piezometers, ground surface elevations were surveyed to the nearest 0.10 foot. The survey data for each of the monitoring wells and piezometers are shown on Table

2-2.

8 (R-5/29/12)

2.1.1.4 Water-Level Measurements

Groundwater-level measurements were collected from each temporary well point, piezometer, and staff gauge using an electronic water level meter. The data were used to interpret groundwater flow direction.

Groundwater-level measurements obtained during the first four sampling events are provided on Table 2-

3. SOP 2 contains a description of the water-level measurement procedures. Groundwater-level measurement forms are contained in Appendix 2-3 of RCRA Subpart X Permit Application for the

Northside OB/OD Unit, Volume II of III – Groundwater Monitoring Plan (January 2003).

2.1.1.5 Conversion/Construction of Permanent Monitoring Wells/Piezometers

Temporary wells 43TW01, 43TW03, 43TW04A, 43TW05, and 43TW06 were completed as permanent wells 43MW01, 43MW03, 43MW04, 43MW05, and 43MW06, respectively, base on the March 20, 2000 teleconference among SCDHEC, JB CHS-Weapons personnel, and TetraTech (TtNUS). The wells were completed by grouting the annulus from the top of the bentonite seal to ground surface, adding an aluminum stick-up protective cover and lock, pouring a 3 by 3 by 0.5 foot concrete surface pad, and installing four bollards at the corners of the well pad at each location. A well construction diagram form was completed for each permanent monitoring well and piezometer and is contained in Appendix 2-4 of

RCRA Subpart X Permit Application for the Northside OB/OD Unit, Volume II of III – Groundwater

Monitoring Plan [January 2003]).

2.1.1.6 Abandonment of Temporary Wells and Piezometers

Temporary wells and piezometers that were not converted to permanent monitoring wells and piezometers (based on groundwater flow directions) were abandoned in accordance with R-61-71.11 of the South Carolina Well Standard and Regulations (June 1985).

Temporary wells 43TW02, 43TW04, 43TW07, and 43TW08 and piezometers 43PZ01 and 43PZ02 were abandoned. The wells were over drilled and the well material was removed. The borings were then grouted to the surface by pressure grouting through a tremie pipe. The well screen and riser were removed from the borings, steam cleaned, and disposed with personal protective equipment (PPE), in accordance with SOP 11.

In addition, the soil boring, 43SB01, drilled to the Ashley Formation, was abandoned upon completion. It was grouted to the surface with cement-bentonite grout.

2.1.1.7 Monitoring Well Development

All monitoring wells were developed following installation using a surge block and a submersible pump.

Field measurements consisting of pH, temperature, specific conductance, oxidation-reduction potential, and turbidity were collected in flow-through cell utilizing a Horiba U-10 Water Quality Meter during the evacuation of water, at 3 to 5 minute intervals. Parameters were considered stable when variations in values were within 10 percent of each other, pH ± 0.2 units, for three consecutive readings. Additionally, the well was developed until the turbidity was below 10 nephelometric turbidity units (NTUs). Well development logs were completed during development and are provided in Appendix 2-5 of RCRA

Subpart X Permit Application for the Northside OB/OD Unit, Volume II of III – Groundwater Monitoring

Plan [January 2003]).

2.1.1.8 Aquifer Testing

Rising head and, when applicable, falling head slug tests were performed on all newly installed permanent monitoring wells. The data generated from these tests were used to help define the hydrologic characteristics of the upper aquifer material, including the average linear velocity of groundwater.

Rising and falling head slug tests were performed at wells 43MW01, 43MW03, 43MW04, and 43MW06. A rising head test only was performed on well 43MW05. The procedure for performing the falling-head slug test consisted of inserting a slug of known volume below the water level within the well, causing a rise in the water level in the well. After water level recovered to its static level, the slug was removed to create a drop of water level within the well for a rising-head test. A 10 pounds per square inch (psi) pressure transducer and a data logger were used to record the water-level recovery data. The data were analyzed using the Hvorslev Method (Hvorslev, 1951). All slug test calculations and data are located in

Appendix 2-6 in RCRA Subpart X Permit Application for the Northside OB/OD Unit, Volume II of III –

Groundwater Monitoring Plan [January 2003]).

2.1.2 Interim Status Groundwater Monitoring and Results

Groundwater samples from the five permanent site monitoring wells (as depicted in Figure 2-1) and a field duplicate were collected during each of the four quarterly sampling events. The samples were obtained using a peristaltic pump and dedicated pre-cleaned tubing, as described in Section 4.0. The groundwater samples were analyzed for Appendix IX metals plus cyanide, SW-846 method 8330 explosives, nitrocellulose, and nitroglycerin. During the first round, one sample at 43MW05 was collected and analyzed for Appendix IX constituents. Table 2-4 presents a summary of the descriptive statistics for positive detection in groundwater samples for the first four sampling events. A complete list of groundwater analytical results is provided in Appendix 2-1, and groundwater sample log sheets are presented in Appendix 2-7, of RCRA Subpart X Permit Application for the Northside OB/OD Unit, Volume II of III – Groundwater Monitoring Plan [January 2003]).

Table 2-5 presents a summary of positive detections for any constituents detected at least once in any round of sampling in any well.

2.1.2.1 Determination of Statistically Significant Increases for Monitored

Groundwater Parameters

For purposes of determining compliance with R.61-79.264 Subpart F groundwater requirements, it was necessary to differentiate between downgradient concentrations potentially attributable to operations at the Northside OB/OD Unit and base background values.

The statistical methods used to evaluate the groundwater data for JB CHS-Weapons are employed to:

• Develop summary statistics (e.g., frequency of detection, range of detection, mean concentration) that describe environmental contaminant concentrations at the Northside OB/OD

Range.

• Allow comparisons of background concentrations to those detected in site environmental samples

(i.e., samples collected in areas potentially contaminated by waste treatment) at the Northside

OB/OD Unit.

The statistical methods that are presented are based on the following references:

• Snedecor, George W., and William G. Cochran, 1980. Statistical Methods. The Iowa State

University Press, 1980.

• Gilbert, Richard O., 1987. Statistical Methods for Environmental Pollution Monitoring. Van

Nostrand Reinhold Company. New York, New York, 1987.

• U.S. EPA, 1989. Guidance Document on the Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities. EPA 530/SW-89-026, 1989.

• U.S. EPA, July 1992. Statistical Training Course for Groundwater Monitoring Data Analysis. EPA

530/R-93-003, 1992.

2.1.2.2 Basic Approach of the Comparison of Downgradient Wells to the

Background

Inorganic downgradient data were compared to existing background data by evaluating downgradient maximum concentrations over the previous four quarters versus agreed-upon background 95% Upper

Tolerance Limits (UTLs).

Summaries of the analytical data and statistical analyses that were performed include the following:

• Table 2-4, which shows summary statistics for the 14 constituents detected at least once during the four quarters of sampling, including

1. Frequency of Detection

2. Range of Detection

3. Location of Maximum Detection

4. Range of Non-Detects

5. Mean Detection

6. Mean Result

• Table 2-5, which shows concentrations of each constituent for which analysis was performed at each downgradient well for the four quarters of sampling.

2.1.2.3 Discussion

The 14 constituents detected in the downgradient wells during the four quarters of groundwater monitoring were

2-Nitrotoluene Nitroglycerin Alpha-BHC 2,4,5-TP

Arsenic Barium Chromium Cobalt

Lead Mercury Nickel Vanadium

Zinc Sulfide

12 (R-5/29/12)

Comparison of maximum concentrations to background 95% UTLs showed that the maximum concentrations were less than the background 95% UTLs for the eight inorganics that have background

95% UTLs. Mercury was detected above the site well background levels in well 43MW06 during the first two rounds and was not detected in the last two monitoring rounds. The firm detection of 2.7 µg/L was above the federal Maximum Contaminant Level (MCL) of 2 µg/L (RBCs circa 2000, since replaced by

Regional Screening Levels [RSLs]).

The positive detections of POC wells of 2-nitrotoluene (well 43MW03) and nitroglycerin (43MW06) in the groundwater samples were evaluated as exceedances because these compounds are not expected to occur naturally. However, each occurred only once in the 16 samples collected over the four rounds. In the case of nitroglycerin, the single detection was an estimated result at a concentration less than one-third the detection limit of the other samples. 2-Nitrotoluene was found in the first round in 43MW03.

However, it was not detected in any other sample collected during the four monitoring rounds. Neither of the exceedances was considered to be significant.

Alpha-BHC and 2,4,5-TP were detected in well 43MW05 during the first round of sampling. This well was sampled during this round for dioxins, furans, VOCs, semi-volatile organic compounds (SVOCs), pesticides, and herbicides, along with the explosives and inorganics sampled in all wells during all rounds.

Their detections were near their respective detection limits. Both Alpha-BHC and 2,4,5-TP are commonly used throughout JB CHS-Weapons and are often found at similar low concentrations in monitoring wells throughout the installation. Their presence in groundwater is considered attributable to their normal use.

Neither Alpha-BHC nor 2,4,5-TP is treated during OB/OD operations, and they are not constituents of any military munition or explosive treated at the OB/OD unit. Therefore, these exceedances were not considered to be attributable to the operation of the Northside OB/OD Unit.

The single detection of sulfide in well 43MW03 is not considered significant due to the minimal human health or ecological risk sulfide introduces to the site.

2.2 SURFACE SOIL SAMPLING

Twenty-five surface soil samples (43SS01 through 43SS25) and three duplicate samples were collected at the Northside OB/OD Unit. The samples were collected at a depth of 0 to 1 foot bgs using pre-cleaned disposable trowels and hand augers. The hand augers were decontaminated between samples using deionized water and Liquinox® soap mixture and a deionized water rinse. The hand augers were then sprayed with isopropyl alcohol, rinsed with deionized water and allowed to air dry. The soil samples were

13 (R-5/29/12) analyzed for explosives, nitroglycerin, nitrocellulose, target analyte list (TAL) metals, and cyanide.

Surface soil samples locations are shown on Figure 2-1. Surface soil sample log sheets are presented in

Appendix 2-8 of RCRA Subpart X Permit Application for the Northside OB/OD Unit, Volume II of III –

A complete list of all soil sample analytical results can be found in Appendix 2-1 of RCRA Subpart X

Permit Application for the Northside OB/OD Unit, Volume II of III – Groundwater Monitoring Plan

[January 2003]). Table 2-6 presents a summary of the positive detections in the surface soil samples.

None of the positive detections for explosives [nitroglycerin (290 µg/kg) in sample 43SS11; 2,4-dinitrotoluene (170 µg/kg) in sample 43SS12; and RDX in the two samples taken at 43SS16 (260 and 210 µg/kg, respectively)] exceed the MCLs. Note that these samples were not within the OB/OD treatment area. Samples 43SS11 and 43SS12 are located in the southwestern corner of the OB/OD unit, near the barricaded crew shelter, and sample 43SS16 was taken west of the OB/OD treatment area. None of the samples taken within the OB/OD treatment area were found to contain explosives.

All positive detections for arsenic, barium, chromium, cobalt, mercury, nickel, selenium, and zinc were below background levels. Cadmium was found in nine samples above the background concentration of

0.05 mg/kg at concentrations ranging from 0.09 mg/kg to 0.22 mg/kg. However, these concentrations are well below the Region 9 RBC of 37 mg/kg for residential soils and 810 mg/kg for industrial soils (RBCs circa 2000, since replaced by Regional Screening Levels [RSLs]). Copper was found in four samples above the site-wide background concentration of 7.90 mg/kg at concentrations ranging from 9.1 to 13.0 mg/kg. However, these concentrations are well below the Region 9 residential RBC for soils of 2,900 mg/kg and industrial RBC of 76,000 mg/kg. Lead was found in one sample at a concentration above the site-wide background of 45.0 mg/kg at a concentration of 48.5 mg/kg. The Region 9 RBC for lead in residential soils is 45.0 mg/kg and the industrial RBC is 750 mg/kg. Vanadium was found in one sample above the site-wide background of 63.9 mg/kg. The concentration was well below the Region 9 RBC of

550 mg/kg for residential soils and 14,000 mg/kg for industrial soils.

2.3 SEDIMENT SAMPLING

Four sediment samples, 43SD01 through 43SD04, and a field duplicate were collected at the Northside

OB/OD Unit at the locations shown on Figure 2-1. Sediment sampling was performed in accordance with

SOP 10. The samples were collected from a depth of 0 to 0.5 foot bgs using pre-cleaned disposable trowels. The samples were analyzed for nitroglycerin, nitrocellulose, explosives, TAL metals, and cyanide.

Copies of the sediment sample log sheets are provided in Appendix 2-9 of RCRA Subpart X Permit

14 (R-5/29/12)

Application for the Northside OB/OD Unit, Volume II of III – Groundwater Monitoring Plan [January

2003]).

A complete list of the analytical results from the sediment samples is presented in Appendix 2-1 of RCRA

Subpart X Permit Application for the Northside OB/OD Unit, Volume II of III – Groundwater Monitoring

Plan [January 2003]). Table 2-7 presents a summary of the positive detections in the sediment samples.

None of the sediment samples were found to contain explosives in excess of the site-wide background.

RDX was detected in sample 43SD04 at a concentration of 110 µg/kg; however, this concentration is well below the Region 9 RBC.

The samples were found to contain varying amounts of arsenic, barium, chromium, copper, lead, nickel, vanadium, and zinc. Arsenic was detected in all the samples at concentrations slightly in excess of the

Region 9 RBC but within the site-wide background level. Zinc was detected (in sample 43SD01) at a concentration above the site-wide background concentrations. Sample 43SD01 was collected in a culvert in the south-central portion of the OB/OD Unit.

2.4 SURFACE WATER SAMPLING

One surface water sample, 43SW01, was collected from the detonation pit (Figure 2-1). The pit was dry until water collected during a period of precipitation. The dimensions of the pit were approximately 4 feet by 4 feet by 18 inches deep. The surface water sample was analyzed for explosives, Appendix IX metals, cyanide, nitroglycerine, nitrocellulose, and sulfide. Water quality parameters were collected from the pit using a Horiba U-22 meter. Two additional surface water samples (43SW02 and 43SW03) were collected from a staff gauge (SG01) located in a drainage ditch along an unnamed road along the southern boundary of the OB/OD Unit. Surface water sample log sheets for the samples are included in

Appendix 2-10 of RCRA Subpart X Permit Application for the Northside OB/OD Unit, Volume II of III –

Appendix 2-1 contains of RCRA Subpart X Permit Application for the Northside OB/OD Unit, Volume II of

III – Groundwater Monitoring Plan [January 2003]), a complete listing of the analytical data for the surface water samples. The positive detections in the surface water samples are summarized in Table 2-

8. The surface water samples were analyzed for explosives (including nitroglycerin and nitrocellulose), Appendix IX metals, and cyanide. Only metals constituents (specifically barium, cadmium, copper, lead, nickel, and zinc) were detected.

RDX was detected in the surface water samples collected from staff gauge location SG01 at concentrations in excess of the Region 9 RBC. Metals (cadmium, copper, lead, and zinc) concentrations were found to exceed the respective site-wide background levels in the sample collected from the detonation pit (42SW01). None of the metals concentrations detected in the surface water samples at the OB/OD unit were found to exceed the Region 3RBCs for tap water.

2.5 QUALITY ASSURANCE/QUALITY CONTROL SAMPLES

Quality assurance/quality control (QA/QC) samples were collected during the baseline field investigation.

Appendix 2-1 of RCRA Subpart X Permit Application for the Northside OB/OD Unit, Volume II of III –

Groundwater Monitoring Plan [January 2003]) contains sample log sheets for the QA/QC samples collected.

2.6 ADDITIONAL FIELD DOCUMENTATION

Appendix 2-12 contains Field Task Modification Request Forms generated during the field investigation.

Appendix 2-13 contains the Equipment Calibration Logs used during the calibration of monitoring instruments. Appendix 2-14 contains copies of the Chain-of-Custody (COC) Forms completed in the field.

All are contained within RCRA Subpart X Permit Application for the Northside OB/OD Unit, Volume II of

III – Groundwater Monitoring Plan [January 2003]).

TABLE 2-1

RATIONALE FOR TEMPORARY WELLS/PIEZOMETERS

NORTHSIDE OB/OD UNIT

JOINT BASE CHARELSTON - WEAPONS, SOUTH CAROLINA

Number Rationale 43TW01 through

43TW08

The eight proposed temporary wells were installed and surveyed.

DTW-level measurements were collected. A potentiometric surface map was constructed and the groundwater flow direction was determined.

43PZ01 and

43PZ02

The two piezometers were installed and surveyed. DTW-level measurements were collected. The piezometer was used to determine whether the gradient is radial or if a groundwater divide exists.

43SG01 and

43SG02

The staff gauges were used to determine the relationship between the groundwater elevation and surface water elevation.

TABLE 2-2

TEMPORARY WELLS/PIEZOMETERS

NORTHSIDE OB/OD UNIT

JOINT BASE CHARELSTON - WEAPONS, SOUTH CAROLINA

Well ID North Coordinates

East Coordinates

Ground Elevation

(ft)

Top of Casing

Elevation (ft)

Top/Bottom of Screen

(ft bgs)

Total Depth (ft bgs)

43MW01(1) 424104.12 2310390.40 31.87 34.52 4-14 15

43MW02 424022.57 2310800.88 31.36 34.26 3-13 14

43MW03(1) 423919.75 2311168.96 28.35 30.89 4-14 15

43MW04(1) 423715.29 2311224.83 26.04 28.64 4-14 15

43MW05(1) 423483.88 2311201.15 30.25 32.76 4.5-14.5 15

43MW06(1) 423369.35 2310961.51 27.64 30.32 4-14 15

43MW07 423291.29 2310480.75 33.80 36.51 4-14 15

43MW08 423590.41 2310302.47 33.84 36.59 4-14 15

43PZ01 423572.34 2311029.33 32.45 35.04 6-16 17

43PZ02 423955.73 2310518.21 32.38 34.91 5-15 16

43SG01 423710.72 2311279.68 24.45 28.09 NA NA

43SG02 423520.64 2310865.14 29.15 33.14 NA NA

Notes:

(1) = Temporary Wells that were converted into permanent monitoring wells.

TABLE 2-3

GROUNDWATER ELEVATIONS - ROUNDS 1-4

NORTHSIDE OB/OD UNIT

JOINT BASE CHARELSTON - WEAPONS, SOUTH CAROLINA

Well No.

Monitoring Event Groundwater Elevations (msl)

1st Event 2nd

Event 3rd Event 4th Event Date 3/20/2000 7/5/2000 10/2/2000 1/10/2001

43MW01(1) 30.13 26.40 31.66 28.42

43MW02(2) 28.29

43MW03(1) 24.89 22.65 26.96 24.26

43MW04(1) 21.58

43MW04A(1) 19.47 22.99 24.60 24.29

43MW05(1) 21.94 19.43 23.03 21.10

43MW06(1) 26.52 25.20 26.39 26.05

43MW07(2) 29.59

43MW08(2) 29.59

43PZ01(2) 27.00

43PZ02(2) 30.25

Notes:

msl = mean sea level

(1) = The temporary wells that were converted into permanent wells.

(2) = These wells were abandoned in March 2000.

TABLE 2-4

DESCRIPTIVE STATISTICS FOR GROUNDWATER

NORTHSIDE OB/OD UNIT - ROUNDS 1-4

Parameters

Frequency of

Detection Minimum Detection

Minimum Qualifier

Maximum Detection

Maximum Qualifier

Locaton of Max Detection

Mean Detection

Range of Non-Detects

Mean Result

(1)

Background 95% Upper Tolerance

Limit (2) Energetics µg/L 2-Nitrotoluene 1/16 2.65 2.65 43MW0301A-AVG 2.65 0.31-0.685 0.34 Nitroglycerin 1/16 0.21 J 0.21 J 43MW0604A 0.21 0.65 0.32 Pesticides/PCBs µg/L Alpha-BHC 1/1 0.03 0.03 43MW0501A 0.03 0.03 Herbicides µg/L

2,4,5-TP

(Silvex) 1/1 0.041 J 0.041 J 43MW0501A 0.041 0.041 Inorganics µg/L Arsenic 1/16 2.025 2.025 43MW0301A-AVG 2.03 2.5-5.7 1.70 4.4(2) Barium 16/16 10.6 37.85 J 43MW0301A-AVG 19.0 19.00 300 Chromium 1/16 2.3 2.3 43MW0303A 2.30 0.8-2.6 0.89 4.45(2) Cobalt 1/16 1.2 1.2 43MW0402A 1.20 0.7-2.2 0.71 16(2) Lead 1/16 1.575 1.575 43MW0301A-AVG 1.58 1.3-1.9 0.80 19.0(2) Mercury 2/16 0.93 2.7 J 43MW0601A 1.82 0.04-0.15 0.27 Nickel 4/16 1.075 3.1 43MW0403A 2.12 1.3-4.5 1.34 24.7 Vanadium 3/16 1.1 2.4 43MW0603A 1.83 0.76-2.1 0.93 78.8 Zinc 2/16 17.5 27.8 43MW0402A 22.7 2.4-20 7.44 153 Miscellaneous Parameters µg/L Sulfide 1/8 2000 J 2000 J 43MW0302A 2000 1000 687.5

Notes:

1 - One half the detection limit is used for non-detects 2-Maximum value is used only if the 95% UTL exceeds the maximum for an undefined distribution

TABLE 2-5

SUMMARY OF POSITIVE DETECTIONS IN GROUNDWATER - ROUNDS 1-4

Unique Sample ID

Site-Wide

USEPA

MCLs

43MW0101A 43MW0102A 43MW0103A 43MW0104A 43MW0301A

43MW0301A-

D 43MW0302A 43MW0303A 43MW0304A 43MW0401A 43MW0402A

Sample Region IX 43MW0101A 43MW0102A 43MW0103A 43MW0104A 43MW0301A FD03210001 43MW0302A 43MW0303A 43MW0304A 43MW0401A 43MW0402A Sample Code Tap Water NORMAL NORMAL NORMAL NORMAL DUP DUP NORMAL NORMAL NORMAL NORMAL NORMAL Round Risk-Based 1 2 3 4 1 1 2 3 4 1 2 Sample Date Concentrations 3/28/00 7/6/00 10/2/00 1/10/01 3/21/00 3/21/00 7/6/00 10/3/00 1/11/01 3/28/00 7/6/00 Energetics µg/L 2-Nitrotoluene NA 61 NA 0.31 UJ 0.31 U 0.34 U 0.44 U 2.6 2.7 0.31 U 0.31 U 0.42 U 0.31 U 0.31 U Nitroglycerin NA 4.8 NA 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U Pesticides/PCBs µg/L Alpha-BHC NA 0.011 NA Herbicides µg/L 2,4,5-TP (Silvex) NA 290 NA Inorganics µg/L Arsenic 4.4(1) 0.045 5 2.5 U 2.9 U 3.6 U 3.2 U 2.8 2.5 U 2.9 U 3.6 U 3.2 U 2.5 U 2.9 U Barium 300 2600 2000 22 18.4 15.5 18.2 36.8 J 38.9 J 24.9 24.4 15.9 13.6 14.9 Cadmium 1.5(1) 18 5 0.7 U 0.3 U 0.4 U 0.25 U 0.7 U 0.7 U 0.3 U 0.4 U 0.25 U 0.7 U 0.3 U Chromium 44.5(1) 55000 100 2.6 U 0.8 U 2 U 1.1 U 2.6 U 2.6 U 0.8 U 2.3 1.1 U 2.6 U 0.8 U Cobalt 16(1) 2200 NA 1.5 U 0.7 U 2.2 U 0.83 U 1.5 U 1.5 U 0.7 U 2.2 U 0.83 U 1.5 U 1.2 Lead 19.0(1) NA 15 1.4 U 1.3 U 1.3 U 1.9 U 2.3 1.7 U 1.3 U 1.3 U 1.9 U 1.4 U 1.3 U Mercury 0.06 11 2 0.05 U 0.1 U 0.1 U 0.1 U 0.04 UJ 0.04 UJ 0.1 U 0.1 U 0.1 U 0.04 U 0.1 U Nickel 24.7 730 NA 1.7 U 1.3 U 1.9 U 2.7 1.8 U 1.8 U 1.3 U 1.9 U 2 U 3.6 U 2 Vanadium 78.8(1) 260 NA 2.1 U 0.8 U 1.4 U 0.76 U 2.1 U 2.1 U 2 U 2 1.1 2.1 U 0.89 U Zinc 153 11000 NA 3.5 U 5 U 2 U 4.3 U 9.8 U 7.5 U 14.2 U 20 U 24 U 17.2 U 27.8 Miscellaneous Parameters µg/L Sulfide NA NA NA 1 U 1 UR 1 U 1 U 2 J 1 U 1 UJ

21 (R-5/29/12)

TABLE 2-5 (Continued)

SUMMARY OF POSITIVE DETECTIONS IN GROUNDWATER - ROUNDS 1-4

Unique Sample ID

Site-Wide

USEPA

MCLs

43MW0501A 43MW0502A

43MW0502A -

D 43MW0503A

43MW0504A-

D 43MW0504A

43MW0504A-

D 43MW0601A 43MW0602A 43MW0603A 43MW0604A

Sample Region IX 43MW0501A 43MW0502A FD07050001 43MW0503A FD100200-1 43MW0504A FD011001-1 43MW0601A 43MW0602A 43MW0603A 43MW0604A

Sample Code Tap Water NORMAL DUP DUP DUP DUP DUP DUP NORMAL NORMAL NORMAL NORMAL

Round Risk-Based 1 2 2 3 3 4 4 1 2 3 4

Sample Date Concentrations 3/28/2000 7/5/2000 7/5/2000 10/2/2000 10/2/2000 1/10/2001 1/10/2001 3/21/2000 7/5/2000 10/3/2000 2/22/2001

Energetics µg/L

2-Nitrotoluene NA 61 NA 0.31 U 0.31 U 0.31 U 0.31 U 0.34 U 0.59 U 0.78 U 0.47 U 0.31 U 0.36 U 0.46 U

Nitroglycerin NA 4.8 NA 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U 0.65 U

Pesticides/PCBs µg/L

Alpha-BHC NA 0.011 NA 0.03

Herbicides µg/L

2,4,5-TP (Silvex) NA 290 50 0.041 J

Inorganics µg/L

Arsenic 4.4(1) 0.045 5 2.5 U 2.9 U 2.9 U 3.6 U 3.2 U 3.2 U 2.5 U 2.9 U 3.6 U 5.7 U

Barium 300 2600 2000 24.8 18.2 19.4 13.1 13.8 14 20.2 J 21.9 16.9 19.2

Cadmium 1.5(1) 18 5 0.7 U 0.3 U 0.3 U 0.4 U 0.25 U 0.25 U 0.7 U 0.3 U 0.4 U 0.25 U

Chromium 44.5(1) 55000 100 2.6 U 0.8 U 0.8 U 2 U 1.1 U 1.1 U 2.6 U 0.8 U 2 U 1.1 U

Cobalt 16(1) 2200 NA 1.5 U 0.7 U 0.7 U 2.2 U 0.83 U 0.83 U 1.5 U 0.7 U 2.2 U 0.83 U

Lead 19.0(1) NA 15 1.4 U 1.3 U 1.3 U 1.3 U 1.9 U 1.9 U 1.7 U 1.3 U 1.3 U 1.9 U

Mercury 0.06 11 2 0.04 UJ 0.1 U 0.1 U 0.1 U 0.11 U 0.1 U 2.7 U 0.93 0.1 U 0.15 U

Nickel 24.7 730 NA 4.5 U 1.5 1.3 U 1.9 U 2 U 2 U 1.8 U 1.3 U 1.9 U 2.3

Vanadium 78.8(1) 260 NA 4.5 U 0.8 U 0.8 U 1.4 U 0.76 U 0.76 U 2.1 U 1.6 U 2.4 0.76 U

Zinc 153 11000 NA 15.9 U 6.4 U 9.3 U 10.6 U 3.5 U 5.1 U 13.9 U 17.5 3.6 U 6.8 U

Miscellaneous Parameters µg/L

Sulfide NA NA NA 1 U 1 UJ 1 UJ 1 U 1 UJ

Darkened and Bold indicates value is above the Site-Wide Background Value

TABLE 2-6

SUMMARY OF POSITIVE DETECTIONS IN SURFACE SOIL SAMPLES

NORTHSIDE OB/OD UNIT

JOINT BASE CHARELSTON - WEAPONS, SOUTH CAROLINA

Unique Sample ID Site-Wide Background (Non-Hydric

Soil)

Region IX Region IX 43SS01 43SS02 43SS03 43SS04 43SS05 43SS05-D 43SS06 43SS07 43SS08 43SS09 43SS10 43SS11 43SS12 43SS13 Sample Risk Based Risk Based 43SS01 43SS02 43SS03 43SS04 43SS05 FD03190002 43SS06 43SS07 43SS08 43SS09 43SS10 43SS11 43SS12 43SS13 Sample Code Concentrations Concentrations NORMAL NORMAL NORMAL NORMAL DUP DUP NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL NORMAL Sample Date Residential Industrial 3/19/00 3/19/00 3/15/00 3/15/00 3/19/00 3/19/00 3/19/00 3/15/00 3/15/00 3/15/00 3/15/00 3/19/00 3/19/00 3/19/00 Energetics µg/kg 2-Nitrotoluene NA 120000 1800000 98U 100U 99U 100U 100U 99U 98U 98U 100U 100U 98U 100U 170 100U Nitroglycerin NA 35000 180000 560U 570U 570U 580U 580U 580U 580U 550U 560U 550U 540U 290J 580U 560U

RDX NA 4400 22000 96U 100U 99U 100U 100U 99U 98U 98U 100U 100U 98U 100U 99U 100U

Inorganics mg/kg

Arsenic 14.2 0.39 2.7 2.7 2.5 11.4 4.5 5.3 1.3 1.70 1.3U 1.8U 1.8U 1.2U 2.5 2.9 3.7 Barium 63.2 5400 100000 134 15.3 18.4 21.9 13.7 12.7 21.1 7 16 9 10.5 14.6 12 15 Cadmium 0.05(1) 37 810 0.06U 0.08U 0.08U 0.08U 0.16 0.08U 0.08U 0.08U 0.08U 0.08U 0.08U 0.06U 0.08U 0.09 Chromium 39.4 210 450 8.4J 9.9J 29.8 13.70 9.6J 4.2J 6.4J 4.2 7.3 5.5 5.2 5.2J 10J 9.6J Cobalt 5.49 4700 100000 0.32 0.057 1U 0.69U 0.79 0.3 0.28 0.35U 0.61U 0.54U 0.53U 0.26 0.41 0.41 Copper 7.90(1) 2900 76000 1.3 2 3.9 5.5 2.6 1.5 1.80 1.3U 2.4 0.94U 1U 2.5 1.6 1.5 Lead 45 400 750 6.1 6.6 10J 14J 7.9 7 12.1 4.5J 6.3J 4.3J 4.2J 22.5 7.6 8.7 Mercury 0.06(1) 23 610 0.02 0.03 0.01U 0.03U 0.02 0.02 0.04 0.01U 0.01U 0.01U 0.01U 0.04 0.04 0.03 Nickel 5.00(1) 1600 41000 1.3 2 2.7 2U 4.3 2.3 1.2 1.1 1.7U 1.4U 1.7U 1.3 1.4 1.5 Selenium 2.10(1) 390 10000 0.36 0.35U 1.7U 0.83U 0.45 0.36U 0.36U 0.34U 0.5U 0.34U 0.34U 0.37U 0.43 0.35U Vanadium 63.9 550 14000 16.5J 32.2J 56.6 29 25.9J 8.8J 13.7J 7.5 12.6 10.7 9 12.9J 19.2J 27.5J Zinc 57.1 23000 100000 3.9U 10 10.3 15.9 8.9 12.1 6.4U 4.7 8.7 3.4U 4.2 10.8 4.3U 6U Miscellaneous Parameters mg/kg Cyanide 2.28(1) 11 35 0.28U 0.26U 0.29U 0.29U 0.29U 0.58U 0.29J 0.27U 0.28U 0.27U 0.07U 0.3U 0.29U 0.28U

TABLE 2-6 (Continued)

SUMMARY OF POSITIVE DETECTIONS IN SURFACE SOIL SAMPLES

NORTHSIDE OB/OD UNIT

JOINT BASE CHARELSTON…