SUPERFUND FINAL CLOSE-OUT REPORT 

NEW HANOVER COUNTY AIRPORT BURN PIT 

WILMINGTON, NORTH CAROLINA 

NCD981021157 

I. INTRODUCTION 

This Final Close-Out Report (FCOR) documents that the U.S. Environmental Protection 

Agency (EPA), the State of North Carolina and the Potential Responsible Parties (PRPs) 

have completed all response actions at the New Hanover County Airport Burn Pit 

Superfund Site (the "Site") in accordance with the September 1992 Record of Decision 

(ROD), the April 2000 ROD Amendment and with Close-Out Procedures for National 

Priorities List Sites (OSWER Directive 9320.2-22). A final inspection ofthe groundwater 

remedial action was conducted on July 14, 2011. 

II. SUMMARY OF SITE CONDITIONS 

Background 

The New Hanover County Airport Burn Pit was constructed by the County of New 

Hanover in 1968. From 1968 to 1979, the Cape Fear Technical Institute (now known as 

the Cape Fear Community College), used the burn pit for fire-training purposes, burning 

jet fuel and gasoline in the burn pit, and extinguishing the fires with water. The 

Wilmington Fire Department used the burn pit for fire-training purposes from 1968 to 

1976 and the United States Air Force used the burn pit for tire-training purposes during 

the Vietnam War. 

Jet fuel and drainage from petroleum fuel storage tanks in the area were burned, and the 

fires were extinguished with water, carbon dio.xide, and dry chemicals. Some time prior 

to 1982. materials used in river spill cleanups were dumped into the burn pit. 

hi 1986, the North Carolina Division of Health Services discovered heavy metals and 

numerous organics in the soil around the burn pit and in other nearby soil samples. 

Surface water within three (3) miles downstream ofthe Site is used for recreational 

activities, and an estuary wetland is located approximately one (1) mile from the Site. 

Approximately 6,300 people obtain drinking water from public and private wells within 

three (3) miles ofthe Site. A private well is located appro.ximately 1,500 feet to the 

northwest of the Site. 

To date, the USEPA has identified si.x (6) potentially responsible parties (PRPs) at the 

Site: the County of New Hanover, North Carolina; the City of Wilmington, North 

Carolina; the Cape Fear Community College; the United States Air Force; Axel Johnson 

Inc. and Sprague Energy Corporation. 

The Site was listed on the National Priorities List on March 31, 1989. EPA negotiated 

with the City of Wilmington, New Hanover County and Cape Fear Community 

10830786 
College in March 1989, for performance ofthe remedial investigation/feasibility study 

(RI/FS), but the parties were unable to reach an agreement. In May 1990, however, the 

parties signed an Administrative Order on Consent (AOC) for a removal action. During 

the removal, the PRPs removed all ofthe source material present at the Site at a cost of 

$452,500.00. 

The USEPA conducted a fund-lead Rl/FS in 1991 and 1992, and issued a ROD for the 

Site on September 29, 1992. Currently, the site is being cleaned up under an Unilateral 

Administrative Order (UAO) with the City of Wilmington, New Hanover County and the 

Cape Fear Community College. The UAO was signed on February 28, 1994, for the 

Remedial Design/Remedial Action (RD/RA) at the site. The tliree municipalities entered 

into a Consent Decree for payment of past response cost on April 1 5, 1995. Additionally, 

Axel Johnson, the U.S Air Force and Sprague Energy agreed with these parties to aid in 

clean-up activities. 

The 1992 ROD contemplated pump-and-treat ofthe groundw'-ater to address low levels of 

benzene, ethyl benzene, lead, and cliromium at an estimated present worth cost of $1.93 

million. As part ofthe remedy, the ROD included a technical impracticability provision 

and provided for an additional year of groundwater sampling for EPA to determine 

whether or not natural attenuation was occurring in the groundwater. After six (6) rounds 

of sampling conducted by EPA's Science and Ecosystem Support Division, there was no 

evidence that natural attenuation was occurring with any ofthe contaminants present in 

the groundwater. The selected remedy is further described below: 

Description ofthe Original Selected Remedy 

The groundwater remediation alternative originally selected for the New Hanover Site is 

Alternative GW#3 - Groundwater Extraction and Physical Treatment (Air Stripping) with 

Discharge to Publicly Owned Treatment Waterworks (POTW). The selected ROD 

remedy was pump and treat and chosen because it was the most effective remedy that 

could treat all contaminants of concern (COC) at the Site including metals. In the 

September 1992 ROD, the COCs were to include Benzene, Chloroform, 1, 2,-

Dichloroethane, Ethylbenzene, Chromium and Lead. The selected pump and treat remedy 

was estimated at a present worth cost of 1.93 million. 

The contaminated aquifer would have been remediated until the performance standards 

were achieved. Following treatment ofthe extracted groundwater, the groundwater would 

have been discharged by the City of Wilmington. A sewer line exists along the perimeter 

roads to the New Hanover County Airport. 

Three (3) extraction wells, each pumping at a rate of five (5) gallons per minute would 

have been necessary to achieve and maintain a sufficient drawdown in the underlying 

aquifer to contain and remove the plume of contamination. The extraction wells would 

have been located within and near the periphery ofthe plume. The extracted groundwater 

would have been treated in an above-ground, on-site air stripper. An optional 

pretreatment step was planned to remove the total suspended solids (TSS) and iron to 

prevent fouling ofthe air stripper. The necessity of a pretreatment step as well as the 
number, placement, and pumping rate ofthe extraction wells was to be determined in the 

RD. The air stripper was to be designed to achieve a less than 1 parts per billion level of 

benzene in the effluent, which was a pretreatment requirement specified by the POTW. 

The original selected remedy did not address the source area at the Site. No further action 

was required for Site soils. In November 1990, the PRPs performed removal actions on 

the waste materials and contaminated surface and subsurface soils. A total of 3,200 tons 

of contaminated soil were removed from the Site. 

Remedial Planning Activities 

Between March 1991 and January 2011, site investigation activities were conducted. The 

analytical data from soil samples collected at the completion ofthe removal action were 

utilized in the Rl. The RI was finalized on January 28, 1992. A Baseline Risk Assessment 

was conducted to define the risk posed by the hazardous waste described in the Rl. 

During the Rl, contaminants that were detected in the groundwater included Volatile 

Organic Compounds (VOCs), semi-volatile organic contaminants (SVOCs), and metals. 

Benzene was the only contaminant consistently detected above the Federal Maximum 

Contaminant Levels (MCLs). As previously stated. Benzene, chloroform, 1,2-

dichloroethane, and ethylbenzene were detected above State groundwater quality 

standards. The total volume of groundwater impacted by the Site is estimated to be 9.7 

million gallons. 

e " 

A Feasibility Study (FS) conducted by CDM and finalized on May 18, 1992 addressed 

alternatives for groundwater remediation. The USEPA decision on the remedial action lo 

be implemented was provided in the ROD which was executed on September 29, 1992. 

The USEPA signed an UAO for Remedial Design/Remedial Action (RD/RA) for the Site 

on February 28, 1994. 

A Preliminary Remedial Design report representing 30% design was submitted to the 

USEPA on December 15, 1994. The USEPA approved the 30% submittal on February 

1995. In accordance with the UAO, the PRPs submitted the Intermediate Design Report 

to the USEPA on June 1, 1995. The Intermediate Design Report did not provide a design 

for the preferred remedy. Instead, the PRPs submitted the intermediate design which 

proposed changing the remedy to an air sparging based system. This type of system was 

not an alternative previously considered; however, its cost could be significantly less than 

•the pump and treat cost while effectively achieving the remedation goals. 

The 1992 ROD included metals contamination such as chromium and lead, as COCs. 

Afterwards, low flow (low turbidity) sampling of select monitoring wells was conducted 

resulting in no detection of metals. Previously identified metals were associated with 

preservative leaching of trace metals from high concentrations of solids from previous 

sampling. Since metals were determined to no longer be COCs, the PRPs requested 

permission to conduct a study to evaluate current groundwater remediation technologies 

and their potential applicability to the Burn Pit Site. 
The remedial teclinology considered best for treating the Site related VOCs was Pulsed 

Air Sparging (PAS). In order to verify its effectiveness at the Burn Pit Site, an Air 

Sparging Treatability Study was conducted in 1998 and the results were documented in 

the Air Sparging Pilot Test Treatability Study Report dated December 16, 1998. The Air 

Sparging Treatability Study results showed air sparging to be very effective at treating 

the VOCs present in the groundwater at the Site. In June 1998, a Feasibility Study 

Amendment (FSA) was then conducted to document the comparison of alternatives in the 

original ROD with the proposed air sparging remedy. A Proposed Plan dated November 

1999, described a fundamental change to the groundwater restoration approach presented 

in the 1992 ROD. 

The USEPA conducted a public meeting on November 30, 1999. A comment period of 

sixty days was provided to receive wTitten or oral comments from the public from 

November 16, 1999 to January 15, 2000. There were no major comments received during 

the public comment period. Since metals contamination was no longer of concern, air 

sparging technology was then considered the preferred i-emedy. 

Based on the Site RI/FS. treatability study, and the amended ROD, the PRP's contractor 

stibmitted a final RD document to implement the new selected remedy. Since the RI was 

not able to completely delineate the extent ofthe groundwater contamination, especially 

the vertical extent, additional monitoring wells were installed during the RD. During the 

1991 and 1992 RI/FS, it was determined that the vertical extent of contamination was 

limited by a highly impermeable clay layer found roughly 25 feet below ground level 

(BGL). During the initial RD efforts, the PRP's contractor installed two telescoping 

monitoring wells to further define the vertical extent of impacts to groundwater. A 

surface casing was installed into the clay to prevent water from the surficial aquifer from 

seeping into the underlying aquifer. An inner wall was then installed through the casing 

below the clay layer and sampled. Sample results confirmed that no contaminants were 

detected below the clay confining unit. 

During RD efforts, additional sampling was conducted by the PRP's contractor to further 

define the extent of dissolved contaminant groundwater plume. Nineteen (19) direct push 

technology (DPT) or rotary drilled borings were installed on Site. Temporary well 

screens were installed to a depth of 15 to 20 feet BGL and groundwater grab samples 

collected. These well screens were left in place for a period of time to assist with 

groundwater flow direction measurements. Additionally, monitoring wells were installed 

outside the perimeter ofthe groundwater plume to confirm the depth ofthe blue clay 

layer surrounding the Site and to confirm the absence of contaminants at these locations. 

The data generated from these samples provided sufficient information to delineate the 

lateral and vertical extent of contamination at the Site. 

Community Relations Activities 

On July 9, 2002, the USEPA held a public availability session at the New Hanover 

County Airport to allow public review and comment on the remedial design. Again, there 

were no major concerns regarding the RD. Therefore, construction activities began on 

.luly 15. 2002. 
Remedial Construction Activities 

The treatment system consisted of 16 pulse zones; each consisted of 5 wells for a total of 

80 sparge wells. Performance verification and compliance monitoring wells were 

installed in accordance with the Final Remedial Design Report dated April 2002. Various 

air sparge wells were installed to test.installation methods by verifying the integrity ofthe 

constructed seal (bentonite), under normal operating pressures. Upon installation, all air 

sparge wells were developed prior to testing. Initial testing of sparge well seal integrity 

was performed on seven sparge wells using a trailer mounted compressor. Two Sullair 

compressors alternately produced the air pulse in succession throughout the 80 well 

systems. The rate of air injected continuously increased and was eventually terminated 

when a steady state condition was reached. Vapors naturally vented into the atmosphere. 

Each pulse of air was injected at a pressure of 15 psig and continued for 90 minutes. The 

recharge time between each pulse of forced air was 23.5 hours. A comprehensive 

monitoring program was implemented to verify that the treatment system reduced the 

HI. MONITORING RESULTS 

The system was started in June 2003 and was turned off on January 22, 2010. Laboratory 

analyses ofthe groundwater samples collected from site groundwater monitoring and 

performance verification wells located in Table 4 revealed no EPA Method 602 

parameter concentrations in excess of applicable 2L GWQS except 1.24 ug/L Benzene in 

the MWD-002 groundwater sample. The subsequent resampling of monitoring well 

MWD-002 over four (4) consecutive quarterly sampling events from January 2010 to 

January 2011 did not reveal any compound concentrations in excess of applicable 2L 

GWQS. It should be noted that MWD-002 results from the last 10 groundwater sampling 

events were in compliance with the EPA Groundwater Standard of 5 ug/L for Benzene. 

IV. ATTAINMENT OF GROUNDWATER RESTORATION CLEANUP LEVELS 

In April 2000, USEPA issued an Amended Record of Decision, in which the Agency 

selected pulsed air sparging as the new remedy for groundwater. Pulsed air sparging 

consists of air being injected (as a pulse) into the aquifer through a strategically located 

network of vertical wells. The injected air travels through the groundwater thereby 

volatilizing and enliancing biological degradation ofthe contaminants dissolved in the 

groundwater. The groundwater clean-up levels for the new selected remedy were 

achieved and are listed below: 

Groundwater clean-up standalrds 

Chemicals of Concern Performance Goals 

GROUNDWATER 

Benzene 

Chloroform 

1.2 Dichloroethane 

Ethylbenzene 

1 ug/L 

0.19 ug/L 

0.38 ug/L 

29 ug/L 
V. SUMMARY OF OPERATION AND MAINTENANCE REQUIRED 

ACTIVITIES 

No operation and maintenance activities are required for this site. 

VI. DEMONSTRATION OF QUALITY ASSURANCE/QUALITY CONTROL 

(QA/QC) FROM CLEAN-UP ACTIVITIES 

The remedial design and the remedial action were carefully reviewed by EPA and the 

State for compliance with all requirements ofthe 1992 ROD. ROD Amendment and with 

all applicable QA/QC procedures and protocol. The QA/QC program utilized throughout 

the remedial action was sufficient and enabled EPA and the State to determine that the 

testing results reported are accurate to the degree needed to assure satisfactory execution 

ofthe RA consistent with the ROD and ROD amendment. 

VII. FIVE-YEAR REVIEW 

The 2008 Five-Year Review concluded that the remedy was functioning in accordance 

with the 2000 ROD AmendiTient. The remedy was protective of human health and the 

environment because all contaminated soils were removed during the 1990 removal; the 

PAS system used to treat contaminated ground water was functioning appropriately. 

Since no hazardous substances are present on-site above levels allowing for unlimited use 

and unrestricted exposure, statutory five year reviews will not be conducted by EPA 

every five years, pursuant to CERCLA Section 121 (c) and as provided in OSWER 

Directive 9355.7-03B-P, Comprehensive Five-Year Review Guidance (EPA, 2001). 

VIII. SITE COMPLETION CRITERIA 

A 

The site meets all requirements as specified in EPA's Closeout Procedures guidance 

(EPA. 2011). Specifically. EPA in consultation with the North Carolina Department of 

Environment Division has determined that the response at the site is complete and no 

further superfund response is needed to protect human health and environment. 

ranklin E. HTII, Din 

Superfund Division Date 

m/// 
IX. BIBLIOGRAPHY 

Superfund Preliminary Site Closeout Report, New Hanover County Airport Burn Pit Site, 

Wilmington, North Carolina, May 2011. 

U.S EPA Five-Year Review Report, New Hanover County Airport Burn Pit Site, 

Wilmington, North Carolina, 

U.S EPA Record of Decision (ROD), New Hanover County Airport Burn Pit Site, 

Wilmington, North Carolina, September 1992 

Remedial Investigation Report, New Hanover County Airport Burn Pit Site, Wilmington. 

North Carolina, January 28, 1992 

Feasibility Study Report, New Hanover County Airport Burn Pit Site, Wilmington. North 

Carolina, May 18, 1992 

U.S EPA ROD Amendment, New Hanover County Airport Burn Pit Site, Wilmington, 

North Carolina, April 2000 

Administrative Order of Consent, New Hanover County Airport Burn Pit Site, 

Wilmington, North Carolina, February 28, 1994 

Final (60%) Design submittal. New Hanover County Airport Burn Pit Site, Wilmington. 

North Carolina, June 1, 1995 

Remedial Action Report, New Hanover County Airport Burn Pit Site. Wilmington, North 

Carolina, August 2003 

Air Sparging Pilot Test Treatability Study Report, New Hanover County Airport Burn 

Pit Site, Wilmington, North Carolina, December 16, 1998. 

Catlin Engineers and Scientists, Monitoring Report, July 16, 2010 

Catlin Engineers and Scientists, Monitoring Report, January 26, 2011 
TABLE 4 

SUMMARY OF HISTORICAL GROUNDWATER LABORATORY RESULTS 

l^.ige I ot 7 

New Hanover County Airport Burn Pit Superfund Site 

© Date: Nov 2010/Ja n 2011 

,3 

Well ID 

Comp 

of Co 

Sample 

ID 

ound 

ncern • 

Date Collected 

2L GWQS (uq/L) 

MWD-001 

MWS-001 

MWD-002 

MWD-001 

MWD-001 

MWD-ObT 

MWD-001 

MWD-001 

MWD-001 

MWD-001 

MWD-001 

MWD-001 

MWD-001 

MWD-001 

MWD-001 

MWD-001 

MWD-001 

MWD-001 

'MWD-OOT 

MWD-001 

MWD-001 

MWD-001 

d/.Lz^iagj 

,..—5/7yj.99.l..... 

....l\Liai.\33.\ 

iLinaaz 

I .1^^9^15.92. 

. 5Z8/199a 

......iQisnagi 

fi/.lU2Q.Q2. 

9/5/2.Q0ii 

1/7/2.Q0.4. 

'j/jy2.Q0.4. 

. iizmsQ.^..... 

5/2/2.Q05.. 

.-..-U/25/.20fl5.... 

5/8/2.Q0& 

. U/J.Q/20I16 

5/8/2.007.. 

. U/2Q/20IIZ 

5/15/2008 

0) 

c 

s 

c 

CO 1 

7.9J 

.7.7. 

.7.7. 

14 

9JU 

J5 

<.Q,5 

<.Q,5 

<.! 

. . . . <1 

<.l 

<.l 

<.! 

<.! 

<.ioa 

.<iaQ 

.<iaQ 

.<j.aQ 

<1.00 

0) 

c 

(U 

N 

c 

a 

>. 

SI 

Ol 550 

8.5J 

7.4 

8.8 

16 

10 

19 

<0.5 

.6.0. 

.3.3. 

.3.5. 

.3.3. 

2.92 

232 

3.7.7 

2.ai 

2.11 

115 

192 

1.60 

c 

0) 

3 

0 

1-

1,000 

2.0J 

1.5J 

1.1J 

1.4J 

<0,5 

1.3J 

<0.5 

<.Q^ 

<x 

<.1.„. 

<x 

<1 

a.a32iL-

<x 

.<.i.oa 

.<i.oa 

<.i.oa 

.<.i.oa 

<1.00 

(U 

Total Xylen 

530 1 

25.3J 

29.1 J 

<.Q^ 

<.Q^ 

<.Qi 

<Q^ . 

. . . <Q^ 

<.l^ . 

<.4... 

<4 

<4 

. . - <4 

. . . <4 

<4 

.<4.oa 

.<4.oa.. 

, .<2.&54-J-.-. 

.<4.oa-. 

<4.00 

Not included in current groundwater samplinq plan I 

MWS-001 1 6/11/2002 1 <0.5 <0.5 <0.5 <1.5 1 

Not included in current groundwater samplinq plan I 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

'MWD-602 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-002 

MWD-00"2 J 

MWD-002 

MWD-002 J 

MWD-002 

MWD-602 . 

MWD-002 

. 4/.izaa9J 

5/7/199.1 

.....tlZ2Q/-l9ai... 

7/7/1992 

. .1.2^9^19.92. 

5/8/199^ 

. lQ(16aa94. 

. s/2a:ia98. 

. 5/2.5^398... 

7/9/199^-. . 

.....Z/2.3Zia98-.... 

. 7I3StL\^'L 

. lll&LZQSn. 

... fi/UZ2aQ2.-

9/5/2.Q0ii 

1/7/2.Q0.4. 

4/J/2.Q0A-

. Z/21Z2Q.Q4. . 

5/2/2.Q0.& 

. .Ui3^Q5 . 

5/8/2.Q0fi. 

.-.-.llZlQ/.20fl6 

5Z8/2.Q07. 

.....iiZ2a'.2oaz 

. 2/.l4Z2aQ8. 

5/.l5Z2flQa. 

. j.ii4Z2aQa. 

2/.l6Z2flQ9. 

. 5/.l4Z2aQ9-

Sil2LU2QS9..... 

.....llZllZ20a9.... 

2/10/2010 

5/20/2010 

8/26/2010 

11/29/2010 

1/5/2011 

.11a 

a4 

lift 

as 

.10a 

ZQ 

. . 124.. 

.127-

12a 

13a... 

9Q 

.4.3. 

afiJi 

mA.. 

.4Z 

as 

33 

. . 68 J 

23 J5 

<.l .... 

a.lJ3 

n ^ 

Jfi.4 

45 JJ 

44a„ 

IfiZ 

4,fiZ-. . 

2,2a 

1215 

193 

.<.LQQ 

0.982 J 

0.710J 

0.723 

1.24 

<0.177 

34 

3J1 

JiZJ. 

3.9 

33 

4flJ2 

3a.9 

42.. 

5 3 ^ 

2.e,.9 

. ...1.1 

j.4.a 

.e.g. .. 

14 

J l 

J.Q 

m2 

7..4.6 

<.l 

5.25 

3J.3 

2.a5 

8.22 

a.42 

.<.1.0fl 

a^nj. 

au46aj. 

.Q.28fiii. 

.<.i.oa 

.<.i.oa 

<0.19 

<0.19 

<0.19 

<0.19 

<0.19 

.14J. 

.13JS.Sil 

2.a>i 

3..4J 

<.Q^ 

9.4 

.4.1 

^.5 . 

£3a 

.2.3. 

<.Q^ 

<Q,5. 

~~~~<!i~~~ " 

<.i 

<i 

12a 

<i 

. aii7.a 

.<.2.oa 

<.i.oa 

..<.i.oa 

<i.oa 

<.i.oa 

.. <D.ai3 

.<aai3-

.<aai3. 

.—. <i.oa 

.<.i.oa 

<0.313 

<0.313 

<0.313 

<0.313 

<0.313 

82J 

82J 

<0.5 

<0.5 

<0.5 

2,.qj 

3.5>a 

23,2 

27.4 

iia 

20,5-. 

<1,5 

J7..a 

4.8 

<7. 

<Si3. 

23.6a 

. . . 3.4.4ji 

<-4 

-<4.6a 

-<-4.oa„.. 

-<-4.4a. 

-<-5.2iL-. 

<5.14. 

<4.oa 

<asa6 

- -<.i.oaa 

-<a8m.. 

<4.oa 

... .<4.oa 

<0.886 

<0.886 

<1.386 

<0.886 

<0.886 

N H C Bur n Pit; Table 4 his t 602 G W results.xis x 

CATLIN Projec t No. 194-040 

CATLIN Engineer s an d Scientist s 

Januar y 2011 
TABLE 4 

SUMMARY OF HISTORICAL GROUNDWATER LABORATORY RESULTS 

RujB 2 of 7 

New Hanover County Airport Burn Pit Superfund Site 

Date: Nov 2010/Jan 2011 

Wel l ID 

Comp 

of Co 

Sample 

ID 

oun d 

ncern * 

Date Collected 

2L GWQS (uq/L) 

MWS-002 

PVSMW-002 

MWS-003 

MWS-002 6/11/2002 

c 

c 

0) 

CO 

1 

<0.5 

0) 

c 

0) 

N 

>< 

.c 

550 

<0.5 

<U 

c 

3 

.2 

1,000 

<0.5 

Total 

Xylenes 

530 

<1.5 

Not included in current groundwater sampling plan | 

PVSMW-002 

PVSMW-002 

PVSMW-002 

PVSMW-002 

PVSMW-002 

PVSMW-002 

PVSMW-002 

PVSMW-002 

PVSMW-d62" 

PVSiviW-662" 

PVSMW-d02 1 

PVSMW-002 

PVSMW-002 

PVSMW-002 

PVSMW-002 

PVSMW-002 

PVSMW-002 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

MWS-003 

6/11/2002 

9/4/2003 

1/7/2004 

4/1/2004 

7/21/2004 

5/2/2005 

11/3/2005 

5/8/2006 

1 i/i 0/20b"6 

5/8/2007 

1 i/20/2007 

5/15/2008 

11/4/2008 

5/13/2009 

11/11/20009 

5/20/2010 

11/30/2010 

4/17/1991 

5/7/1991 

11/19/1991 

7/7/1992 

12/9/1992 

6/9/1993 

10/5/1994 

1/16/2001 

6/11/2002 

9/4/2003 

1/7/2004 

4/1/2004 

7/21/2004 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

5/8/2007 

11/20/2007 

5/15/2008 

11/4/2008 

5/13/2009 

11/11/2009 

5/21/2010 

11/30/2010 

<0.5 

<1 

<1 

<1 

<1 

.<! 

.<.l....-

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0,177 

<0.177 

<1,00 

<0.177 

<0.177 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<5 

4.4 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.177 

<0.177 

<1.00 

<0.177 

<0.177 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<i.6b' 

<1.00 

<1.00 

<1.00 

<i.6o 

<0.19 

<0.19 

<1.00 

<0.19 

<0.19 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<5 

0.5 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.19 

<0.19 

<i.oo 

<0.i9 

<0.19 

<0.5 

<1 

<1 

<1 

<1 

0.921 J 

<1 

<i.6b' 

<1.00 

<1.00 

<1.00 

<i.6o 

<0.313 

<0.313 

<i.oo 

<b"3i3 

<0.313 

0.89J 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<5 

<0.5 

<0.5 

<1 

<1 

<1 

<1 

1.60 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.313 

<0.313 

<1.00 

<0.313 

<0.313 

<1.5 

<4 

<4 

<4 

<5.54 

<4 

<4 

<4.00 

<4.00 

<4.00 

<4.00 

<4.00 

<0.886 

<0.886 

<4.00 

<0.886 

<0.886 

<1.5 

0.77J 

<1.5 

<1.5 

<1.5 

<1.5 

<10 

2.4 

<1.5 

<4 

<4 

<4 

<4 

<4 

<4 

<4.00 

<4.00 

<4.00 

<4.00 

<4.00 

<0.886 

<0.886 

<4.00 

<0.886 

<0.886 

3 

NHC Burn Pit; Table 4 hist 602 GW results.xisx 

CATLIN Project No. 194-040 

CATLIN Engineers and Scientists 

January 2011 
TABLE 4 

SUMMARY OF HISTORICAL GROUNDWATER LABORATORY RESULTS 

Piige 3 of 7 

New Hanover County Airport Burn Pit Superfund Site 

Date: Nov 2010/Jan 2011 

o 

Wel l ID 

Comp 

of Co 

Sample 

ID 

lound 

ncern *• 

Date Collected 

2L GWQS (uq/L) 

MWS-004 

MWD-005 

MWD-006 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 ^ 

MWS-0b4 

MWS-004 . 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWS-004 

MWD-005 

MWD-6b"5 ^ 

4/17/1991 

5/7/1991 

7/7/1991 

11/19/1991 

12/9/1992 

6/9/1993 

10/5/1994 

1/16/2001 

6/11/2002 

9/4/2003 

1/8/2004 

4/1/2004 

7/21/2004 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

5/8/2007 

11/20/2007 

5/15/2008 

11/4/2008 

57l3/2b'd9 

1 i/ib/'2ob9 

572'i/2bio 

11/30/2010 

1/16/2001 

6/11/2002 

0) 

c 

<u 

N 

C 

<u 

CO 

1 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

0.832 J 

0.749 J 

<0.177 

<1.00 

<0.177 

<0.177 

<0.5 

<0.5 

(U 

c 

a 

c 

0) £ 

>> 

J : 

ai 

550 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.19 

<0.19 

<1.00 

<0.19 

<0.19 

<0.5 

<0.5 

c 

0) 

3 

O 

1-

1,000 

<0.5 

<0.5 

0.52J 

<0.5 

<0.5 

<0.5 

<0.5 

<0.5 

<6.5 

<1 

<1 

<1 

<1 

1.47 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.313 

<0.313 

<1.00 

<0.313 

<0.313 

<0.5 

<b.5 

Total Xylenes 

530 

<1.5 

<1.5 

<1.5 

<1.5 

<1.5 

<1.5 

<1.5 

<1.5 

<1.5 

<4 

<4 

<4 

<4 

<4 

<4 

<4.00 

<4.00 

<4.00 

<4.00 

<4.00 

<0.886 

<0.886 

<4.00 

<0.886 

<0.886 

<1.5 

<0.5 

Not included in current groundwater sampling plan | 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

MWD-006 

4/12/2001 

6/11/2002 

9/4/2003 

1/8/2004 

4/1/2004 

7/21/2004 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

5/8/2007 

11/20/2007 

5/15/2008 

11/4/2008 

5/13/2009 

11/10/2009 

5/21/2010 

11/30/2010 

<0.5 

3.4 

1.5 

<1 

<1 

<1 

<1 

<1 

6.402" J 

<1.00 

<1.00 

<1.00 

<1.00 

<0.177 

<0.177 

<1.00 

<0.177 

<0.177 

<0.5 

<d.5 

<1 

<1 

<1 

<1 

<1 

<1 

<i.ob 

<1.00 

<i.ob 

<1.00 

<i.oo 

<0.19 

<0.19 

<1.00 

<0.19 

<0.19 

<0.5 

<0.5 

<1 

<1 

<1 

<1 

0.490 J 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.313 

<0.313 

<1.00 

<0.313 

<0.313 

<1.5 

3.8 

<4 

<4 

<4 

<4 

<2.820 J 

< 3.73 J 

<2.0525 J 

<2.876J 

<2.981 J 

<3.02 J 

<3.05 J 

<2.041 J 

<1.144 J 

<4.00 

<0.895 J 

<1.711 J 

NHC Burn Pit; Table 4 hist 602 GW results.xisx 

CATLIN Project No. 194-040 

CATLIN Engineers and Scientists 

January 2011 
TABLE 4 

SUMMARY OF HISTORICAL GROUNDWATER LABORATORY RESULTS 

Page 4 of 7 

New Hanover County Airport Burn Pit Superfund Site 

o Date: Nov 2010/Jan 2011 

Wel l ID 

Comp 

of Co 

Sample 

ID 

oun d 

ncern ^ 

Date Collected 

2L GWQS (uq/L) 

CMW-007 

CMW-008 

CMW-009 

CMW-007 

CMW-007 

CMW-007 

CMW-007 

CMW-007 

CMW-007 

CMW-007 

CMW-007 

CMW-007 

CMW-007 

CMW-Obf 1 

CMW-007 

6/11/2002 

9/5/2003 

1/7/2004 

1 4/1/2004 

7/21/2004 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

5/8/2007 

11/20/2007 

5/15/2b08 

c 

s 

c 

0) 

CO 

1 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<i.0'0" 

<1.00 

<a 

c a 

c 

0) 

x> 

>. 

J= *^ 

LU 

550 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<i.o"o" 

.<1.00 

0) 

c 

0) 

3 

i2 

1,000 

<0.5 

<1 

<1 

<1 

<1 

0.736 J 

<1 

<1.00 

<1.00 

<1.00 

<i.00 

<1.00 

Total Xylenes 

530 

<1.5 

<4 

<4 

<4 

<4 

<4 

<4 

<4.00 

<4.00 

<4.00 

<4.00 

<4.00 

Not included in current groundwater sampling plan | 

CMW-008 

CMW-008 

CMW-008 

CMW-008 

CMW-008 

CMW-008 

CMW-008 

CMW-008 

CMW-008 

CMW-008 

CMW-008 

CMW-008 

6/11/2002 

9/5/2003 

1/7/2004 

4/1/2004 

772"i/2b"04 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

5/8/2007 

11/20/2007 

5/15/2008 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.5 

<1 

<1 

<1 

<1 

0.810 J 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<1.5 

<4 

<4 

<4 

<4 

<2.618J 

<4 

<4.00 

<4.00 

<4.00 

<4.00 

<4.00 

Not included in current groundwater sampling plan | 

CMW-009 

CMW-009 

CMW-009 

CMW-009 

CMW-009 

CMW-009 

CMW-009 

CMW-009 

CMW-009 

CMW-009 

CMW-009 

CMW-009 

6/11/2002 

9/5/2003 

1/772004" 

4/1/2004 

77'2"i72b"04 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

5/8/2007 

1V26/2067 

5/15/2008 

<0.5 

<1 

<1 

<1 

<1 

<1" 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<i.ob 

<1.00 

<1.00 

<1.00 

<1.00 

<0.5 

<1 

<1 

<1 

<1 

0.876 J 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<1.5 

<4 

<4 

<4 

<4.29 

<4 

<4 

<4.00 

<4.00 

<4.00 

<4.00 

<4.00 

Not included in current groundwater sampling plan | 

J) 

NHC Burn Pit; Table 4 hist 602 GW results.xisx 

CATLIN Project No. 194-040 

CATLIN Engineers and Scientists 

January 2011 
TABLE 4 

SUMMARY OF HISTORICAL GROUNDWATER LABORATORY RESULTS 

P:uje 5 of 7 

New Hanover County Airport Burn Pit Superfund Site 

o Date: Nov 2010/Jan 2011 

o 

Wel l ID 

Compoun d 

of Concern • 

Sample 

ID 

Date Collected 

2L GWQS (uq/L) 

PVMW-010 

PVMW-011 

CMW-012 

PVMW-010 

PVMW-010 

PVMW-010 

PVMW-010 

PVMW-010 

PVMW-010 

PVMW-010 

PVMW-010 

PVMW-010 

PVMW-010 

PVMW-010 

PVMW-010 

6/11/2002 

9/5/2003 

1/7/2004 

^ 4/172do'4" 

7/21/2004 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

5/8/2007 

11/20/2007 

57l572"o'd8 

c 

0) 

ca 

1 

<0.5 

<1 

<1 

<1 

<1 

<1 

<l' 

<1,00 

<i.o"d 

<1.00 

<1.00 

<i.ob 

0) 

c 

a 

c 

<u 

> . 

. c 

••-* 

Ol 

550 

<0.5 

<1 

<1 

<1 

1.57 

0.310 J 

<1 

<1.00 

<i.6b 

<1.00 

2.90 

5.07 

0) 

c 

3 

o 

1-

1,000 

<0.5 

<1 

<1 

<1 

<1 

0.866 J 

<1 

<1.00 

<i.00 

<1.00 

<1.00 

<i.oo 

Total 

Xylenes 

530 

<1.5 

<4 

<4 

<4 

<4,73 

<4 

<4 

<4.00 

<4,00 

<4.00 

<4.00 

<4.00 

Not included in current groundwater sampling plan | 

PVMW-011 

PVMW-011 

PVMW-011 

PVMW-011 

PVM'W-bi 1 J 

PVMW-011 

PVMW-011 

PV'M'W-OII" 1 

PVMW-011 

PVMW-011 

PVMW-011 

PVMW-011 

PVMW-011 

PVMW-011 

PVMW-011 

PVMW-011 

PVMW-011 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

CMW-012 

6/11/2002 

9/5/2003 

1/7/2004 

4/1/2004 

7/21/2004 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

5/8/2007 

11/20/2007 

5/15/2008 

11/4/2008 

5714/2009 

11/11/2009 

5/20/2010 

{i73d72bio 

6/11/2002 

9/5/2003 

1/7/2004 

4/1/2004 • 

7/21/2004 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

5/8/2007 

11/20/2007 

5/15/2008 

11/4/2008 

5/13/2009 

11/10/2009 

5/21/2010 

11/30/2010 

2.6 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.177 

<b.177 

<1.00 

<0.177 

<0.177 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.177 

<0.177 

<1.00 

<0.177 

<0.177 

2.7 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<i.6b 

<0.19 

<6.i'9" 

<1.00 

<0.19 

<0.19 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.19 

<0.19 

<1.00 

<0.19 

<0.19 

<0.5 

<{ 

<1 

<1 

<1 

0.976 J 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.313 

<0.313 

<1.00 

<0.313 

<0.313 

<0.5 

<1 

<1 

<1 

<1 

0.980 J 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.313 

<0.313 

<1.00 

<0.313 

<0.313 

2.8 

<4 

<4 

<4 

<4 

<4 

<4 

<4.00 

<4.00 

<4.00 

<4.00 

<4.00 

<0.886 

<0.886 

<4.00 

<0.886 

<0.886 

<1.5 

<4 

<4 

<4 

<4 

<4 

<4 

<4.00 

<4,00 

<4.00 

<4.00 

<4.00 

<0.886 

<0.886 

<4.00 

<0.886 

<0.886 

~ ) 

NHC Burn Pit; Table 4 hist 602 GW results.xisx 

CATLIN Project No. 194-040 

CATLIN Engineers and Scientists 

January 2011 
TABLE 4 

SUMMARY OF HISTORICAL GROUNDWATER LABORATORY RESULTS 

P.ige 6 of 7 

New Hanover County Airport Burn Pit Superfund Site 

Date: Nov 2010/Jan 2011 

( "^ 

Well ID 

Comp 

of Co 

Sample 

ID 

ound 

ncern ' 

Date Collected 

2L GWQS (uq/L) 

CMW-013 

PVIVIW-014 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

CMW-013 

PVMW-014 

PV'M"w"-0i4 ^ 

PVMW-014 J 

PVMW-014 

PVMW-014 

PVMW-014 

PVMW-014 _^ 

PVMW-014 

PVMW-014 J 

PVMW-014 

PVMW-014 

PVMW-014 

PVMW-014 

PVMW-014 

PVMW-014 

PVMW-014 

PVMW-014 

L 6/11/2002 

9/5/2003 

1/7/2004 

4/1/2004 

7/21/2004 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

57872007 

11/20/2007 

5/15/2008 

11/4/2008 

"57l372b"d9 

11/10/2009 

5/21/2010 

11/30/2010 

6/11/2002 

9/472663 

1/7/2004 

4/1/2004 

7/21/2004 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

57872667" 

11/20/2007 

5/15/2008 

11/4/2008 

5/14/2009 

11/10/2009 

5/20/2010 

11/29/2010 

(1) 

c 

Q> 

N 

C 

(U 

CQ 

1 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<i.6"6 

<1.00 

1.19 

1.41 

"d.27"7'"j" 

<1.00 

<0.177 

<0.177 

4.4 

5.0 

3.3 

1.5 

<1 

0.925 J 

3.20 

0.599 J 

0.933 J 

0.688 J 

<1.00 

<1.00 

<0.177 

<0.177 

<1.00 

<0.177 

<0.177 

0) 

c 

a 

c 

0) 

Ul 

550 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<i.6b 

<i.6"6 

1.01 

1.30 

"6.2'84J 

<1.00 

<0.19 

<0.19 

1.6 

<1" 

<1 

<1 

<1 

0.306 J 

0.319 J 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.19 

<0.19 

<1.00 

<0.19 

<0.19 

(U 

c 

0) 

3 

0 

1,000 

<0.5 

<1 

<1 

<1 

<1 

1.24 

<1 

<1.00 

<1.00 

<i.6"d 

<1.00 

<1.00 

<0,313 

'd.'85"9"j 

<1.00 

<b."3"T3 

<0.313 

<0.5 

<l' 

<1 

<1 

<1 

2.29 

<1 

<1.00 

<1.00 

<1.00 

<1.00 

<1.00 

<0.313 

<0.313 

<1.00 

<0.313 

<0.313 

Total Xylenes 

530 

<1.5 

<4 

<4 

<4 

<6,84 

1.290 J 

<4 

<2.274 J 

<4.00 

<4.00 

<4.00 

<4.00 

<1.108J 

<0.886 

<4.00 

<0.886 

<0.886 

2.1 

<4 

<4 

<4 

<4 

1.346 J 

<4 

<4.00 

<4.00 

<4.00 

<4.00 

<4.00 

<0.886 

<0.886 

<4.00 

<0.886 

<0.886 

^ 

NHC Burn Pit; Table 4 hist 602 GW results.xisx 

CATLIN Project No. 194-040 

CATLIN Engineers and Scientists 

January 2011 
TABLE 4 

SUMMARY OF HISTORICAL GROUNDWATER LABORATORY RESULTS 

P:uje 7 of 7 

New Hanover County Airport Burn Pit Superfund Site 

Date: Nov 2010/Jan 2011 

o 

Well ID 

Comp 

of Co 

Sample 

ID 

ound 

ncern *" 

Date Collected 

2L GWQS (uq/L) 

PVMW-015 

CMW-016 

PVMW-015 

PVMW-015 

PVMW-015 

PVMW-015 

PVMW-015 

PVMW-015 

PVMW-015 

PVMW-dis" 1 

PVMW-015 

PVMW-015 

pv"^7l"w-di5 1 

PV"M'w"-0i5 ' 

PVMW-015 

PVMW-015 

PVMW-015 

PVMW-015 

PVMW-015 

CMW-016 

CMW-016 

CMW-016 

CMW-016 

CMW-016 

CMW-016 

CMW-016 

CMW-016 

CMW-016 

CMW-016 

CMW-016 

CMW-016 J 

CMW-016 1 

CMW-016 ^ 

CMW-016 , 

CMW-016 

CMW-016 1 

6/11/2002 

9/4/2003 

1/8/2004 

4/22/2004 

7/21/2004 

5/2/2005 

11/3/2005 

57872d6"6" 

11/10/2006 

5/8/2007 

11/20/2007 

"571572008 

11/4/2008 

5/14/2009 

11/10/2009 

5/20/2010 

11/29/2010 

6/11/2002 

9/5/2003 

1/8/2004 

4/1/2004 

7/21/2004 

5/2/2005 

11/3/2005 

5/8/2006 

11/10/2006 

5/8/2007 

11/20/2007 

5/15/2008 

"l 17472068 

5/13/2009 

11/10/2009 

5/21/2010 

il729/"2bl0 

0) 

c 

a 

c 

<u 

C1 O 

4.1 

<1 

<1 

<1 

<1 

0.779 J 

<1 

i.75 

<1.00 

<1.00 

3.17 

<i.o6 

<0.177 

<0.177 

<1.00 

<0.177 

<0.177 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<0.177 

<0.177 

<1.00 

<0.177 

<0.177 

0) 

c 

0) 

N 

c 

<u 

n 

UJ 

550 

1.4 

<1 

<1 

<1 

<1 

0.311 J 

<1 

0.124 J 

<i.6'6 

<1.00 

1.14 

<i.6b 

<0.19 

<0.19 

<1.00 

<0.19 

<0.19 

<0.5 

<1 

<1 

<1 

<1 

<1 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<0.19 

<0.19 

<100 

<0.19 

<0.19 

0) 

c 

a> 

3 

0 

1-

1,000 

<0.5 

<1 

<1 

<1 

<1 

2.33 

<1 

<i6o 

<1.00 

<1.00 

<1.00 

<i.6'd 

<0.313 

<0.313 

<1.00 

<0.313 

<0,313 

<0.5 

<1 

<1 

<1 

<1 

2.31 

<1 

<1 

<1 

<1.00 

<1.00 

<1.00 

<0.313 

<0.313 

<1.00 

<0.313 

<0.313 

Total 

Xylenes 

530 

2.1 

<4 

<4 

<4 

<4 

1.349 J 

<4 

<2.280J 

<4.00 

<4.00 

<4.00 

<4.00 

<0.886 

<0.886 

<4.00 

<0.886 

<0.886 

<1.5 

<4 

<4 

<4 

<4 

<2.666 J 

<4 

<4 

<4 

<4.00 

<4.00 

<4.00 

<0.866 

<0.866 

<4.00 

<0.886 

<0.886 

All results in micrograms per liter (Mg/L). 

2L GWQS = NCAC T15A:02L Groundwater Quality Standards 

Bold results indicate concentrations above 2L GWQS. 

J = Estimated concentration, below calibration range and above Mettiod Dectection Limit 

< = Less ttian reporting limits 

NHC Burn Pit; Table 4 hist 602 GW results.xlsx 

CATLIN Project No. 194-040 

CATLIN Engineers and Scientists 

January 2011