09_-_PF225_K1B_Phase_I_ESA_Amendment_Letter_RE_Soil_Sampling_Final_Report_093010.pdf

September 30, 2010

Ms. Hope Pollmann USACE-Fort Worth District CESWF-SWF-PER/Pollmann 819 Taylor Street, RM 3A14 Fort Worth, TX 76102-0300

Re: Amendment to the Phase I Environmental Site Assessment for El Paso Fence Section K-1B:

Soil Sampling and Analysis Report – W9126G-09-D-0067-0026

Dear Ms. Pollmann:

This letter report will serve to amend the Phase I Environmental Site Assessment for the El Paso Fence Section K-1B corridor to reflect the results of soil sampling and analysis to address historical contamination of surface soils from the now-closed ASARCO copper smelter.

Introduction and Methods

U.S. Customs and Border Protection (CBP) proposes to construct a pedestrian fence (Section K-1B) in El Paso along the north and east side of the American Canal between West Paisano Drive and the Rio Grande. The majority of the property within the construction corridor belongs to the U.S. Section, International Boundary and Water Commission (USIBWC), with some construction on private property and highway right of way belonging to the State of Texas. Along with the fence, a maintenance and patrol road will also be constructed. A Phase I Environmental Site Assessment completed for the construction corridor revealed risk concerns due to an active petroleum contamination plume from adjacent private property, and possible soil contamination from previous emissions from the ASARCO lead and copper smelter located in the vicinity.

The El Paso K-1B Fence Segment project corridor is located within the area of concern for lead and arsenic contamination of surface soils from the closed ASARCO smelter facility, located approximately

0.5 mile to the north. In order to characterize the level of surface soil contamination present in the project corridor, surface soil samples were collected along the 3,100-foot long project corridor using the same sample collection protocol used previously by U.S. Army Corps of Engineers (USACE) and U.S.

Environmental Protection Agency (USEPA) contractors for testing soils in the surrounding neighborhoods (USEPA 2001). It was previously determined that highest lead and arsenic levels were found in the top 1 to 2 inches of soil.

The sample collection was accomplished on July 7, 2010. Ten samples were collected within the top 1.5 inches of soil, within an approximately 3-inch diameter area at evenly spaced intervals to cover the entire length of the project corridor (see Sample Location Map attached to this report). Samples were placed in laboratory-supplied glass sample jars, labeled and sealed, and then brought back to Gulf South Research

Letter Report

Corporation (GSRC) offices and held until authorization for analysis was received. Analysis was accomplished at Gulf Coast Analytical Laboratories in Baton Rouge, Louisiana on September 2, 2010 for the eight Resource Conservation and Recovery Act (RCRA) metals of concern (arsenic, barium, cadmium, chromium, lead, mercury, selenium and silver) using standard USEPA-approved methods. The sample holding time for mercury analysis was exceeded, but the analysis was done at the request of GSRC, since mercury is not a contaminant of concern based on previous soil analysis reports in the area.

Sample Analysis Results

The results of the sample analyses are presented in Table 1. All samples tested above USEPA Regional Screening Levels for arsenic in soil, and eight samples tested above USEPA Regional Screening Levels for chromium in soil. Based on previous published reports by USEPA for remediation work proposed and accomplished in the surrounding areas of El Paso for contamination from the closed ASARCO smelter, the remediation action levels for arsenic and lead in soil were determined to be 24 milligrams/kilogram (mg/kg) for arsenic and 500 mg/kg for lead (the USEPA screening levels for residential property) (USEPA 2002). Only two samples tested above the remediation action levels in the project corridor, Sample 8 and Sample 9, both located near the north end of the corridor.

Table 1. K-1B Soil Samples Analysis Results Sample Number

Arsenic mg/kg

Barium mg/kg

Cadmium mg/kg

Chromium mg/kg

Lead mg/kg

Mercury mg/kg

Selenium mg/kg

Silver mg/kg

1 3.04 154 ND 7.02 12.6 ND ND ND

2 8.31 170 1.51 5.52 71.9 0.025 ND ND

3 11.4 146 1.93 6.77 104 0.039 ND ND

4 9.8 143 4.88 5.21 107 0.042 ND ND

5 11.7 116 ND 6.19 10.6 ND ND ND

6 9.66 131 1.54 6.06 88.8 0.084 ND ND

7 21.4 166 4.74 6.04 180 0.063 ND ND

8 43.9 228 6.08 5.91 338 0.34 ND 1.07

9 48.0 125 15.0 7.59 562 0.23 ND 1.63

10 11.0 88.5 3.03 8.25 106 0.040 ND ND

Regional Screening Levels*

1.6 mg/kg

190,000 mg/kg mg/kg

5.6 mg/kg mg/kg mg/kg

5,100 mg/kg

5,100 mg/kg

ASARCO

Action Levels1 mg/kg

N/A N/A N/A 500 mg/kg

N/A N/A N/A

Highlighted samples are above ASARCO action levels for arsenic and lead ND = Not Detected above minimum detection levels

* USEPA Regional Screening Levels for Industrial Soils (May 2010) (USEPA 2010) 1 Screening Levels for the El Paso area – ASARCO remediation project (USEPA 2001, 2002)

Discussion of Soil Analysis Results

The results of the soil sample analysis in the project corridor confirm previous speculation that surface soils in the K-1B fence project corridor may be contaminated by heavy metals historically emitted by the ASARCO smelter. While not all of the samples collected had arsenic and lead contamination at levels above the remediation action levels established by the Texas Commission on Environmental Quality

Letter Report

(TCEQ) and USEPA, the level of sampling done for the project corridor was at a screening level only, and varying levels of lead and arsenic were found in all samples collected.

The project corridor varies in topographic elevation from highest at the north end to lowest at the south end of the corridor. The south end of the project corridor is within the established flood zone for the area, and is flooded during heavy rain events. This is reflected in the sample analysis results, and likely resulted in dilution of most metals concentrations at the south end of the project corridor by flood waters and other disturbance (see Chart 1). The higher elevations and relatively undisturbed surface soils at the north end of the corridor more clearly reflect the contamination levels normally expected from the ASARCO contamination in this area. Sample 10 was taken in road fill adjacent to West Paisano Drive, since it was not possible to sample within the American Canal due to lack of access (closed fence and concrete-lined canal).

Chart 1. Graphic Presentation of Soil Metals Concentration

Properties adjacent to the project corridor include a public city park (Doniphan Park), and several buildings with occupied residential apartments. These properties would fall within the action level parameters for properties requiring removal of lead and arsenic contaminated soils above the ASARCO action levels. A prior correspondence from USIBWC dated February 11, 2008 (attached), requested a remediation plan for soil excavation in the vicinity of the ASARCO smelter, and recommended that proper precautions be taken for worker protection when disturbing contaminated soils on USIBWC property in that area. The levels of arsenic and lead found in soils in the El Paso K-1B fence construction corridor are such that a remediation plan for soil disturbance during fence and road construction should be prepared, and any excavated soil removed from the project site should be tested for lead and arsenic levels prior to disposal. If excavated soil analysis results show levels of lead or arsenic above the ASARCO action levels, then notification to USEPA and TCEQ would be required, and consultation to determine a proper disposal site would be necessary.

3!(

September 2010 Sample Location Map

· 0 90 180 270 360 Feet

Parcel Boundaries !( Sample Locations

ANALYTICAL RESULTS

PERFORMED BY

GULF COAST ANALYTICAL LABORATORIES, INC.

7979 GSRI Avenue

Baton Rouge, LA 70820

Report Date 09/08/2010

GCAL Report 210090209

*210090209*

Deliver To GSRC 8081 GSRI Ave.

Baton Rouge, LA 70820 225-757-8088

Attn Stephen Oivanki

Project GSRC

NELAP CERTIFICATE NUMBER 01955

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Sample analysis was performed in accordance with approved methodologies provided by the Environmental Protection Agency or other recognized agencies. The samples and their corresponding extracts will be maintained for a period of 30 days unless otherwise arranged. Following this retention period the samples will be disposed in accordance with GCAL's Standard Operating Procedures.

Common Abbreviations Utilized in this Report

ND Indicates the result was Not Detected at the specified RDL DO Indicates the result was Diluted Out MI Indicates the result was subject to Matrix Interference TNTC Indicates the result was Too Numerous To Count SUBC Indicates the analysis was Sub-Contracted FLD Indicates the analysis was performed in the Field PQL Practical Quantitation Limit MDL Method Detection Limit RDL Reporting Detection Limit 00:00 Reported as a time equivalent to 12:00 AM

Reporting Flags Utilized in this Report

J Indicates an estimated value U Indicates the compound was analyzed for but not detected B (ORGANICS) Indicates the analyte was detected in the associated Method Blank B (INORGANICS) Indicates the result is between the RDL and MDL

Sample receipt at GCAL is documented through the attached chain of custody. In accordance with NELAC, this report shall be reproduced only in full and with the written permission of GCAL. The results contained within this report relate only to the samples reported. The documented results are presented within this report.

This report pertains only to the samples listed in the Report Sample Summary and should be retained as a permanent record thereof. The results contained within this report are intended for the use of the client.

Any unauthorized use of the information contained in this report is prohibited.

I certify that this data package is in compliance with the NELAC standard and terms and conditions of the contract and Statement of Work both technically and for completeness, for other than the conditions in the case narrative. Release of the data contained in this hardcopy data package and in the computer-readable data submitted has been authorized by the Quality Assurance Manager or his/her designee, as verified by the following signature.

Estimated uncertainty of measurement is available upon request. This report is in compliance with the DOD QSM as specified in the contract if applicable.

Robyn Migues Technical Director

GCAL REPORT 210090209

THIS REPORT CONTAINS _______ PAGES.

Laboratory Endorsement

IntegriSign Thu Sep 09 11:06:44 2010

IntegriSign Thu Sep 09 11:06:58 2010

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020901 SAMPLE 1 Solid 07/07/2010 07:30 09/02/2010 08:25 21009020902 SAMPLE 2 Solid 07/07/2010 07:45 09/02/2010 08:25 21009020903 SAMPLE 3 Solid 07/07/2010 07:55 09/02/2010 08:25 21009020904 SAMPLE 4 Solid 07/07/2010 08:45 09/02/2010 08:25 21009020905 SAMPLE 5 Solid 07/07/2010 08:50 09/02/2010 08:25 21009020906 SAMPLE 6 Solid 07/07/2010 08:55 09/02/2010 08:25 21009020907 SAMPLE 7 Solid 07/07/2010 09:05 09/02/2010 08:25 21009020908 SAMPLE 8 Solid 07/07/2010 09:15 09/02/2010 08:25 21009020909 SAMPLE 9 Solid 07/07/2010 09:20 09/02/2010 08:25 21009020910 SAMPLE 10 Solid 07/07/2010 09:30 09/02/2010 08:25

Report Sample Summary

GCAL Report 210090209

SW-846 6010B

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 3.04 1.60 0.22 mg/kg 7440-39-3 Barium 154 0.40 0.017 mg/kg 7440-47-3 Chromium 7.02 0.40 0.024 mg/kg 7439-92-1 Lead 12.6 0.60 0.066 mg/kg

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020902 SAMPLE 2 Solid 07/07/2010 07:45 09/02/2010 08:25

SW-846 7471B

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.025 0.010 0.0027 mg/kg

SW-846 6010B

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 8.31 1.60 0.22 mg/kg 7440-39-3 Barium 170 0.40 0.017 mg/kg 7440-43-9 Cadmium 1.51 0.20 0.0083 mg/kg 7440-47-3 Chromium 5.52 0.40 0.024 mg/kg 7439-92-1 Lead 71.9 0.60 0.066 mg/kg

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020903 SAMPLE 3 Solid 07/07/2010 07:55 09/02/2010 08:25

SW-846 6010B

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 11.4 1.59 0.22 mg/kg 7440-39-3 Barium 146 0.40 0.017 mg/kg 7440-43-9 Cadmium 1.93 0.20 0.0082 mg/kg 7440-47-3 Chromium 6.77 0.40 0.023 mg/kg 7439-92-1 Lead 104 0.60 0.066 mg/kg

SW-846 7471B

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.039 0.010 0.0027 mg/kg

Summary of Compounds Detected

21009020904 SAMPLE 4 Solid 07/07/2010 08:45 09/02/2010 08:25

SW-846 6010B

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 9.80 1.60 0.22 mg/kg 7440-39-3 Barium 143 0.40 0.017 mg/kg 7440-43-9 Cadmium 4.88 0.20 0.0083 mg/kg 7440-47-3 Chromium 5.21 0.40 0.024 mg/kg 7439-92-1 Lead 107 0.60 0.066 mg/kg

SW-846 7471B

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.042 0.010 0.0027 mg/kg

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020905 SAMPLE 5 Solid 07/07/2010 08:50 09/02/2010 08:25

SW-846 6010B

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 11.7 1.60 0.22 mg/kg 7440-39-3 Barium 116 0.40 0.017 mg/kg 7440-47-3 Chromium 6.19 0.40 0.024 mg/kg 7439-92-1 Lead 10.6 0.60 0.066 mg/kg

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020906 SAMPLE 6 Solid 07/07/2010 08:55 09/02/2010 08:25

SW-846 7471B

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.084 0.010 0.0027 mg/kg

SW-846 6010B

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 9.66 1.60 0.22 mg/kg 7440-39-3 Barium 131 0.40 0.017 mg/kg 7440-43-9 Cadmium 1.54 0.20 0.0083 mg/kg 7440-47-3 Chromium 6.06 0.40 0.024 mg/kg 7439-92-1 Lead 88.8 0.60 0.066 mg/kg

Summary of Compounds Detected (con't)

21009020907 SAMPLE 7 Solid 07/07/2010 09:05 09/02/2010 08:25

SW-846 6010B

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 21.4 1.60 0.22 mg/kg 7440-39-3 Barium 166 0.40 0.017 mg/kg 7440-43-9 Cadmium 4.74 0.20 0.0083 mg/kg 7440-47-3 Chromium 6.04 0.40 0.024 mg/kg 7439-92-1 Lead 180 0.60 0.066 mg/kg

SW-846 7471B

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.063 0.010 0.0027 mg/kg

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020908 SAMPLE 8 Solid 07/07/2010 09:15 09/02/2010 08:25

SW-846 6010B

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 43.9 1.60 0.22 mg/kg 7440-39-3 Barium 228 0.40 0.017 mg/kg 7440-43-9 Cadmium 6.08 0.20 0.0083 mg/kg 7440-47-3 Chromium 5.91 0.40 0.024 mg/kg 7439-92-1 Lead 338 0.60 0.066 mg/kg 7440-22-4 Silver 1.07 0.40 0.031 mg/kg

SW-846 7471B

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.34 0.010 0.0027 mg/kg

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020909 SAMPLE 9 Solid 07/07/2010 09:20 09/02/2010 08:25

SW-846 7471B

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.23 0.010 0.0027 mg/kg

SW-846 6010B

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 48.0 1.60 0.22 mg/kg 7440-39-3 Barium 125 0.40 0.017 mg/kg 7440-43-9 Cadmium 15.0 0.20 0.0083 mg/kg 7440-47-3 Chromium 7.59 0.40 0.024 mg/kg

21009020909 SAMPLE 9 Solid 07/07/2010 09:20 09/02/2010 08:25

SW-846 6010B

CAS# Parameter Result RDL MDL Units

7439-92-1 Lead 562 0.60 0.066 mg/kg 7440-22-4 Silver 1.63 0.40 0.031 mg/kg

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020910 SAMPLE 10 Solid 07/07/2010 09:30 09/02/2010 08:25

SW-846 7471B

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.040 0.010 0.0027 mg/kg

SW-846 6010B

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 11.0 1.59 0.22 mg/kg 7440-39-3 Barium 88.5 0.40 0.017 mg/kg 7440-43-9 Cadmium 3.03 0.20 0.0082 mg/kg 7440-47-3 Chromium 8.25 0.40 0.023 mg/kg 7439-92-1 Lead 106 0.60 0.066 mg/kg

SW-846 7471B

Prep Date Prep Batch Prep Method Dilution Analyzed By Analytical Batch

09/02/2010 10:00 441133 SW-846 7471B 1 09/03/2010 11:58 CLB 441176

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury ND 0.010 0.0027 mg/kg

SW-846 6010B

Prep Date Prep Batch Prep Method Dilution Analyzed By Analytical Batch

09/02/2010 10:00 441132 SW-846 3050B 1 09/07/2010 23:32 CNB 441454

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 3.04 1.60 0.22 mg/kg 7440-39-3 Barium 154 0.40 0.017 mg/kg 7440-43-9 Cadmium ND 0.20 0.0083 mg/kg 7440-47-3 Chromium 7.02 0.40 0.024 mg/kg 7439-92-1 Lead 12.6 0.60 0.066 mg/kg 7782-49-2 Selenium ND 1.60 0.25 mg/kg 7440-22-4 Silver ND 0.40 0.031 mg/kg

RESULTS REPORTED ON A WET WEIGHT BASIS

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time

09/02/2010 10:00 441133 SW-846 7471B 1 09/03/2010 12:00 CLB 441176

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.025 0.010 0.0027 mg/kg

SW-846 6010B

Prep Date Prep Batch Prep Method Dilution Analyzed By Analytical Batch

09/02/2010 10:00 441132 SW-846 3050B 1 09/08/2010 00:06 CNB 441454

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 8.31 1.60 0.22 mg/kg 7440-39-3 Barium 170 0.40 0.017 mg/kg 7440-43-9 Cadmium 1.51 0.20 0.0083 mg/kg 7440-47-3 Chromium 5.52 0.40 0.024 mg/kg 7439-92-1 Lead 71.9 0.60 0.066 mg/kg 7782-49-2 Selenium ND 1.60 0.25 mg/kg 7440-22-4 Silver ND 0.40 0.031 mg/kg

RESULTS REPORTED ON A WET WEIGHT BASIS

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020902 SAMPLE 2 Solid 07/07/2010 07:45 09/02/2010 08:25

09/02/2010 10:00 441133 SW-846 7471B 1 09/03/2010 12:01 CLB 441176

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.039 0.010 0.0027 mg/kg

SW-846 6010B

Prep Date Prep Batch Prep Method Dilution Analyzed By Analytical Batch

09/02/2010 10:00 441132 SW-846 3050B 1 09/08/2010 00:12 CNB 441454

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 11.4 1.59 0.22 mg/kg 7440-39-3 Barium 146 0.40 0.017 mg/kg 7440-43-9 Cadmium 1.93 0.20 0.0082 mg/kg 7440-47-3 Chromium 6.77 0.40 0.023 mg/kg 7439-92-1 Lead 104 0.60 0.066 mg/kg 7782-49-2 Selenium ND 1.59 0.25 mg/kg 7440-22-4 Silver ND 0.40 0.031 mg/kg

RESULTS REPORTED ON A WET WEIGHT BASIS

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020903 SAMPLE 3 Solid 07/07/2010 07:55 09/02/2010 08:25

09/02/2010 10:00 441133 SW-846 7471B 1 09/03/2010 12:03 CLB 441176

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.042 0.010 0.0027 mg/kg

SW-846 6010B

Prep Date Prep Batch Prep Method Dilution Analyzed By Analytical Batch

09/02/2010 10:00 441132 SW-846 3050B 1 09/08/2010 00:19 CNB 441454

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 9.80 1.60 0.22 mg/kg 7440-39-3 Barium 143 0.40 0.017 mg/kg 7440-43-9 Cadmium 4.88 0.20 0.0083 mg/kg 7440-47-3 Chromium 5.21 0.40 0.024 mg/kg 7439-92-1 Lead 107 0.60 0.066 mg/kg 7782-49-2 Selenium ND 1.60 0.25 mg/kg 7440-22-4 Silver ND 0.40 0.031 mg/kg

RESULTS REPORTED ON A WET WEIGHT BASIS

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020904 SAMPLE 4 Solid 07/07/2010 08:45 09/02/2010 08:25

09/02/2010 10:00 441133 SW-846 7471B 1 09/03/2010 12:08 CLB 441176

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury ND 0.010 0.0027 mg/kg

SW-846 6010B

Prep Date Prep Batch Prep Method Dilution Analyzed By Analytical Batch

09/02/2010 10:00 441132 SW-846 3050B 1 09/08/2010 00:26 CNB 441454

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 11.7 1.60 0.22 mg/kg 7440-39-3 Barium 116 0.40 0.017 mg/kg 7440-43-9 Cadmium ND 0.20 0.0083 mg/kg 7440-47-3 Chromium 6.19 0.40 0.024 mg/kg 7439-92-1 Lead 10.6 0.60 0.066 mg/kg 7782-49-2 Selenium ND 1.60 0.25 mg/kg 7440-22-4 Silver ND 0.40 0.031 mg/kg

RESULTS REPORTED ON A WET WEIGHT BASIS

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020905 SAMPLE 5 Solid 07/07/2010 08:50 09/02/2010 08:25

09/02/2010 10:00 441133 SW-846 7471B 1 09/03/2010 11:52 CLB 441176

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.084 0.010 0.0027 mg/kg

SW-846 6010B

Prep Date Prep Batch Prep Method Dilution Analyzed By Analytical Batch

09/02/2010 10:00 441132 SW-846 3050B 1 09/07/2010 23:00 CNB 441454

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 9.66 1.60 0.22 mg/kg 7440-39-3 Barium 131 0.40 0.017 mg/kg 7440-43-9 Cadmium 1.54 0.20 0.0083 mg/kg 7440-47-3 Chromium 6.06 0.40 0.024 mg/kg 7439-92-1 Lead 88.8 0.60 0.066 mg/kg 7782-49-2 Selenium ND 1.60 0.25 mg/kg 7440-22-4 Silver ND 0.40 0.031 mg/kg

RESULTS REPORTED ON A WET WEIGHT BASIS

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020906 SAMPLE 6 Solid 07/07/2010 08:55 09/02/2010 08:25

09/02/2010 10:00 441133 SW-846 7471B 1 09/03/2010 12:09 CLB 441176

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.063 0.010 0.0027 mg/kg

SW-846 6010B

Prep Date Prep Batch Prep Method Dilution Analyzed By Analytical Batch

09/02/2010 10:00 441132 SW-846 3050B 1 09/08/2010 00:32 CNB 441454

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 21.4 1.60 0.22 mg/kg 7440-39-3 Barium 166 0.40 0.017 mg/kg 7440-43-9 Cadmium 4.74 0.20 0.0083 mg/kg 7440-47-3 Chromium 6.04 0.40 0.024 mg/kg 7439-92-1 Lead 180 0.60 0.066 mg/kg 7782-49-2 Selenium ND 1.60 0.25 mg/kg 7440-22-4 Silver ND 0.40 0.031 mg/kg

RESULTS REPORTED ON A WET WEIGHT BASIS

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020907 SAMPLE 7 Solid 07/07/2010 09:05 09/02/2010 08:25

09/02/2010 10:00 441133 SW-846 7471B 1 09/03/2010 12:11 CLB 441176

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.34 0.010 0.0027 mg/kg

SW-846 6010B

Prep Date Prep Batch Prep Method Dilution Analyzed By Analytical Batch

09/02/2010 10:00 441132 SW-846 3050B 1 09/08/2010 00:39 CNB 441454

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 43.9 1.60 0.22 mg/kg 7440-39-3 Barium 228 0.40 0.017 mg/kg 7440-43-9 Cadmium 6.08 0.20 0.0083 mg/kg 7440-47-3 Chromium 5.91 0.40 0.024 mg/kg 7439-92-1 Lead 338 0.60 0.066 mg/kg 7782-49-2 Selenium ND 1.60 0.25 mg/kg 7440-22-4 Silver 1.07 0.40 0.031 mg/kg

RESULTS REPORTED ON A WET WEIGHT BASIS

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020908 SAMPLE 8 Solid 07/07/2010 09:15 09/02/2010 08:25

09/02/2010 10:00 441133 SW-846 7471B 1 09/03/2010 12:13 CLB 441176

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.23 0.010 0.0027 mg/kg

SW-846 6010B

Prep Date Prep Batch Prep Method Dilution Analyzed By Analytical Batch

09/02/2010 10:00 441132 SW-846 3050B 1 09/08/2010 00:45 CNB 441454

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 48.0 1.60 0.22 mg/kg 7440-39-3 Barium 125 0.40 0.017 mg/kg 7440-43-9 Cadmium 15.0 0.20 0.0083 mg/kg 7440-47-3 Chromium 7.59 0.40 0.024 mg/kg 7439-92-1 Lead 562 0.60 0.066 mg/kg 7782-49-2 Selenium ND 1.60 0.25 mg/kg 7440-22-4 Silver 1.63 0.40 0.031 mg/kg

RESULTS REPORTED ON A WET WEIGHT BASIS

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020909 SAMPLE 9 Solid 07/07/2010 09:20 09/02/2010 08:25

09/02/2010 10:00 441133 SW-846 7471B 1 09/03/2010 12:14 CLB 441176

CAS# Parameter Result RDL MDL Units

7439-97-6 Mercury 0.040 0.010 0.0027 mg/kg

SW-846 6010B

Prep Date Prep Batch Prep Method Dilution Analyzed By Analytical Batch

09/02/2010 10:00 441132 SW-846 3050B 1 09/08/2010 00:52 CNB 441454

CAS# Parameter Result RDL MDL Units

7440-38-2 Arsenic 11.0 1.59 0.22 mg/kg 7440-39-3 Barium 88.5 0.40 0.017 mg/kg 7440-43-9 Cadmium 3.03 0.20 0.0082 mg/kg 7440-47-3 Chromium 8.25 0.40 0.023 mg/kg 7439-92-1 Lead 106 0.60 0.066 mg/kg 7782-49-2 Selenium ND 1.59 0.25 mg/kg 7440-22-4 Silver ND 0.40 0.031 mg/kg

RESULTS REPORTED ON A WET WEIGHT BASIS

GCAL ID Client ID Matrix Collect Date/Time Receive Date/Time 21009020910 SAMPLE 10 Solid 07/07/2010 09:30 09/02/2010 08:25

A n al yt ic al

B at ch

C lie n t

ID

M

B

LC

S

P re p

B at ch

G C

A L

ID

P re p

M et h o d S

W -8

B

S am p le

T yp e M et ho d B la nk

LC

S

P re p D at e

/0

2/

:0

/0

2/

:0

A n al yt ic al

D at e

/0 3/

:4

/0 3/

:5

M at ri x S ol id

S ol id

S W

-8

B U n it s m g/ kg

S p ik e

A d d ed

R es u lt

R

C o n tr o l

L im it s

R

R es u lt

R D

L

-9

7-

M er cu ry

N D

0.

0.

0.

A n al yt ic al

B at ch

C lie n t

ID

S

A M

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LE

M S

P re p B at ch

G

C A

L

ID

P re p

M et h o d S

W -8

B

S am p le

T yp e S

A M

P

LE

M S

P re p D at e

/0

2/

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A n al yt ic al

D at e

/0 3/

:5

/0 3/

:5

M at ri x S ol id

S ol id

S W

-8

B U n it s m g/ kg

S p ik e

A d d ed

R es u lt

R

C o n tr o l

L im it s

R

R es u lt

R D

L

-9

7-

M er cu ry

0.

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0.

0.

A n al yt ic al

B at ch

C lie n t

ID

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LE

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B at ch

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A L

ID

P re p M et h o d

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-8

B S am p le T yp e

S A

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LE

D

U P

P re p D at e

/0

2/

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A n al yt ic al

D at e

/0 3/

:5

/0 3/

:5

M at ri x S ol id

S ol id

S W

-8

B U n it s m g/ kg

R es u lt

R P

D R

P D

L im it R es u lt R

D L

-9 7-

M er cu ry 0.

0.

0.

In or ga ni cs Q ua lit y C on tr ol S um m ar y

G C

A L

R ep o rt al yt ic al

B at ch

C lie n t

ID

M

B

LC

S

P re p

B at ch

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ID

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M et h o d S

W -8

B

S am p le

T yp e M et ho d B la nk

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P re p D at e

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A n al yt ic al

D at e

/0 7/

:4

/0 7/

:5

M at ri x S ol id

S ol id

S W

-8

B U n it s m g/ kg

S p ik e

A d d ed

R es u lt

R

C o n tr o l

L im it s

R

R es u lt

R D

L

-3

8-

A rs en ic

N D

1.

.0

.1

-3

9-

B ar iu m

N D

0.

.0

.4

-4 3-

C ad m iu m

N D

0.

.0

.6

-4

7-

C hr om iu m N

D 0.

.0

.4

-9

2-

Le ad

N D

0.

.0

.1

-4 9-

S el en iu m

N D

1.

.0

.4

-2

2-

S ilv er N

D 0.

.0

.1

A n al yt ic al

B at ch

C lie n t

ID

S

A M

P

LE

M S

P re p B at ch

G

C A

L

ID

P re p

M et h o d S

W -8

B

S am p le

T yp e S

A M

P

LE

M S

P re p D at e

/0

2/

:0

/0

2/

:0

A n al yt ic al

D at e

/0 7/

:0

/0 7/

:1

M at ri x S ol id

S ol id

S W

-8

B U n it s m g/ kg

S p ik e

A d d ed

R es u lt

R

C o n tr o l

L im it s

R

R es u lt

R D

L

-3

8-

A rs en ic

9.

1.

.0

.2

-3

9-

B ar iu m

0.

.0

5*

-4 3-

C ad m iu m

1.

0.

.0

.1

-4

7-

C hr om iu m 6.

0.

.0

.0

-9 2-

Le ad

.8 0.

.0

8*

-4

9-

S el en iu m 0.

1.

.0

.6

-2 2-

S ilv er

0.

0.

.0

.6

In or ga ni cs Q ua lit y C on tr ol S um m ar y

G C

A L

R ep o rt al yt ic al

B at ch

C lie n t

ID

S

A M

P

LE

D U

P P re p

B at ch

G C

A L

ID

P re p M et h o d

S W

-8

B S am p le T yp e

S A

M P

LE

D

U P

P re p D at e

/0

2/

:0

/0

2/

:0

A n al yt ic al

D at e

/0 7/

:0

/0 7/

:0

M at ri x S ol id

S ol id

S W

-8

B U n it s m g/ kg

R es u lt

R P

D R

P D

L im it R es u lt R

D L

-3 8-

A rs en ic 9.

1.

.9

-3

9-

B ar iu m

0.

0.

-4

3-

C ad m iu m 1.

0.

1.

-4

7-

C hr om iu m 6.

0.

6.

0.

-9

2-

Le ad

.8

0.

.3

-4 9-

S el en iu m

0.

1.

0.

-2 2-

S ilv er

0.

0.

0.

In or ga ni cs Q ua lit y C on tr ol S um m ar y

G C

A L

R ep o rt