J.04_20011015_Issues_Concerns_AC_Replacement.pdf

Technical Memorandum: - Environmental Issues and Concel'ns ; -

I I ' C

Conceptual Deslgn sway of Replacement ~ a n k ~ i n i n i American Canal, American Dam to lnternstiohal ~ a r h ment I

Technical Memorandum:

Environmental Issues and Concerns

Conceptual Design Study of Replacement Canal Lining American Canal, American Dam to International Dam

Contract # IBM-00-08 Task Order #9 -American Canal Replacement Lining Design

October 15,2001

Prepared for:

U.S. International Boundary Water Commission The Commons

Building C, Suite 310 El Paso, Texas 79922

Prepared by:

Montgomery Watson Harza 6100 Indian School Road NE

Suite 100 Albuquerque, New Mexico 87110

Technical Memomndrcm . Conceprual Design Srudy Replacemen1 Canal Lining

American Canal

CONTENTS

SECTION PAGE

ACRONYMS ................................................................................................................................. vi

. INTRODUCTION ....................................................................................................................... 1 1

1.1 Project Location and Projected Construction Activities ................................................ 1-1 ............................................................................................ 1.2 Environmental Data Review 1-3

1.2.1 USIBWC American Dam Facility ............................................................................ 1-5

1.2.2 ASARCO Smelter ...................................................................................................... 1-5

1.2.3 Bell Thunderbird Facility ........................................................................................... 1-6

1.2.4 Paisano Auto Salvage ............................................................................................ 1-6

1.2.5 USIBWC International Dam Facility .................................................................... 1-6 . .

1.3 Report Organ~zatlon .................................................................................................... 1-6

...................................................................................................................... 2.0 OBJECTIVES 2-1

3.0 APPROACH ........................................................................................................................ 3-1

3.1 Sampling and Analysis Plan ............................................................................................. 3-1 . .

3.2 Field Investlgatlon ............................................................................................................ 3-2

4.0 RESULTS ............................................................................................................................. 4-1

4.1 Surface and Subsurface Soils ........................................................................................... 4-1

4.1.1 Metals ......................................................................................................................... 4-1

4.1.2 Volatile Organic Constituents ................................................................................... 4-14

4.1.3 Semi-Volatile Organic Constituents ......................................................................... 4-14

4.2 Groundwater Sampling .................................................................................................. 4-14

4.2.1 Metals ....................................................................................................................... 4-17

4.2.2 Volatile Organic Constituents ................................................................................... 4-17

4.2.3 Semi-Volatile Organic Constituents ......................................................................... 4-17

5.0 DISCUSSION ...................................................................................................................... 5-1

5.1 Construction Impacts ........................................................................................................ 5-1

5.2 Construction Dewatering Impacts .................................................................................... 5-3

5.3 Permitting ......................................................................................................................... 5-5

6.0 CONCLUSIONS AND RECOMMENDATIONS ............................................................... 6-1

7.0 REFERENCES ..................................................................................................................... 7.1

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Technical Memorandrtm - Conceprual Design Srudy Replocenrenr Canal Lining

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APPENDICES

m

APPENDM A ANALYTICAL. LABORATORY DATA

m APPENDIX B OSHA LEAD IN CONSTRUCTION REGULATIONS 29 CFR 1926.62

APPENDIX C BACKGROUND INFORMATION REGARDING REGIONAL. IMPACTS

I FROM ASARCO SMELTER

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Technical Memorandum - Corrceprual Design Srudv Replacenzenr Canal Lining

American Canal

FIGURES

FIGURE PAGE

...................................................................................... Figure 1-1. Soil Boring and Well Location Map 1-2

.................................................................................................. Figure 3-1. Upper Area American Canal 3-4 ............................................................................................... Figure 3-2.. Middle Area American Canal 3-5

Figure 3-3. Lower Area American Canal .................................................................................................. 3-6

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American Conol

TABLES

TABLE PF "'

Table 1-1. Contamination Potential in Open Channel Areas .................................................................... I+

................................................................ Table 3-1. American Canal Sampling and Analyses Summary 3-2

Table 4-1. Soil Sampling ResultsConceptual Design Study of Replacement Canal Lining American Canal Reach "F, American Dam to International Dam ...................................... 4-2

Table 4-2. Groundwater Sampling Results Conceptual Design Study of Replacement Canal ........................ LiningAmerican Canal Reach " F , American Dam to International Dam 4-15

Table 5-1. Maximum Soil Contaminant Concentrations Detected in Open Channel Areas .................... 5-2 Table 5-2. Contaminated Soil Volume Estimates - Upper and Middle Channel ...................................... 5 4 Table 5-3. Summary of Groundwater Maximum Detected Contaminant Concentrations

............................................................................................... in Three Open Channel Areas 5-5

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Anterican Carsol

ACRONYMS

American Canal Project Conceptual Design Study of Replacement Canal Lining, American Canal Reach "F', American Dam to International Dam

AS ARC0 American Smelting and Refining Company

BNSF

BTEX

Burlington Northern Santa Fe benzene, ethylbenzene, toluene, ortho-xylene, and meta- and para-zylenes cfs cubic feet per second

DRO deisel-range organic

E A

EPA

ESA

environmental assessment U.S. Environmental Protection Agency Environmental Species Act

GRO gasoline-range organic

HHRB human health risk-based

LPST leaking petroleum storage tank

MCL

mgflcg m g n

MWH

maximum contaminant level milligrams per kilogram milligrams per liter Montgomery Watson Harza

NO1 notice of intent NOT notice of termination NPDES National Pollutant Discharge Elimination System

OSHA Occupational Safety and Health Administration

PAH

PEL

polynuclear aromatic hydrocarbon permissible exposure limit

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Technical Memorandum - Conceprual Desig!~ Sludy Replacemenr Canal Lining

American Canal

RGACE Rio Grande American Canal Extension ROW right-of-way

SAP sampling and analysis plan SVOC semi-volatile organic compound SWPPP Stormwater Pollution Prevention Plan

TNRCC Texas Natural Resource Conservation Commission

TPDES Texas Pollutant Discharge Elimination System permit

TPH total petroleum hydrocarbon

P& micrograms per liter USIBWC U.S. International Boundary Water

Commission UST underground storage tank

VOC volatile organic compound

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Technical Memorandunr - Co,tceptual Design SIudv Replacemen1 Canal Lining

American Canal

1.0 INTRODUCTION

Montgomery Watson Harza (MWH) conducted environmental sampling in conjunction with geotechnical investigations undertaken in support of the Conceptual Design Study of Replacement Canal Lining, American Canal Reach "F", American Dam to International Dam (American Canal project) performed for the U.S. International Boundary Water Commission (USIBWC). This work is being conducted under contract # IBM-00-08, Task Order #9 - American Canal Replacement Lining Design. This Technical Memorandum is the first deliverable of the Conceptual Design study for the American Canal project.

The purpose of this Technical Memorandum is to quickly summarize analytical results for soil andfor groundwater and to evaluate whether special considerations for environmental issues will be required during construction activities associated with the American Canal project. Much of the information presented herein will also be provided as part of the Conceptual Design study.

1.1 Project Location and Projected Construction Activities

The American Canal receives river diversions from the Rio Grande through headgates located on the left bank of the river at American Dam in El Paso, Texas. The canal conveys this flow for a distance of two miles along the left bank of the river and delivers it to the upstream end of the Rio Grande American Canal Extension (RGACE), near the International Dam. The American Canal was constructed between 1937 and 1938 with a design capacity of 1,200 cubic feet (ft) per second (cfs). Portions of the canal contain gravel underdrains running along the sides, toes, and bottom of the lining; these underdrains empty into the canal through 2-inch diameter drain holes constructed through the concrete lining and roughly spaced every 5 ft along the length of the underdrain. When the canal is de-watered, the underdrains are observed to discharge aoundwater into the canal, along with noticeable quantities of sand and silt. The American - - Canal right-of-way (ROW) is adjacent to several sites with potential soil and groundwater contamination associated with hydrocarbons and metals including the American Smelting and - Refining Company (ASARCO) 1 El Paso Smelter, Thunderbird Gas, and other facilities (ENCON, 2000 and TNRCC, 2001). The American Canal ROW and adjacent facilities are shown on Figure 1-1.

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I I I

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I I i 1 Legend:

I !!!! Soil Boring (B) andlor Monitoring Well (MW) Location

I 1 N

S I Lower Area American Canal - Figure 3-3

600 0 600 00 Feet

Replacement Canal Lining American Canal Reach F

El Paso, Texas

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MONTGOMERY WATSON HARZA

BORING AND WELL

LOCATION MAP

Figure: 1-1

Construction activities for the American Canal project are expected to include the following:

a Excavation and demolition of the current Canal a Reconfiguring the three open segments of the Canal lining

Demolition and reconstruction of the existing single vehicle bridge allowing access to the ASARCO property and licensed to ASARCO

Construction dewatering to facilitate excavation below the current water table

Surface discharge of dewatering liquids via a Texas Pollutant Discharge Elimination System (TPDES) permit

For the purposes of discussion, the ROW is subdivided into three open channel segments, the upper, middle, and lower reach or channel. The upper channel includes the former site of Smeltertown, a community near the ASARCO smelter that was relocated due to contamination associated with lead in soils. The Burlington Northern Santa Fe (BNSF) Railroad parallels the American Canal i n the upper and middle reaches. The middle reach is immediately adjacent to the railroad tracks requiring close coordination with BNSF staff regarding rail traffic during investigation activities.

1.2 Environmental Data Review

Several facilities were identified in the draft Environmental Assessment (EA) (ENCON, 2000) prepared in support of evaluating five proposed alternatives for reconstruction of the American Canal. Data provided in the EA were supplemented by further regulatory review and by information requests made of ASARCO regarding more recent data collection and sampling activities (MWH, 2001c and Hydrometrics, 2001). Table 1-1 provides an overview of potential environmental impacts identified by the EA (ENCON, 2000).

The Texas Natural resource Conservation Commission (TNRCC) leaking petroleum storage tank (LPST) database was also queried for updates on site status (TNRCC,2001).

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Anterican Canal

Table 1-1. Contamination Potential in Open Channel Areas l~ontaminants / Matrix U w e r Channel I Middle Channel Lower Channel

Arsenic r Cadmium

Lead

I~elenium Unlikely 1 Low 1 Low

Soil

Water

Soil

Water

Soil

Water

I ~ i e s e l - ~ a n ~ e Organics Soil 1 Moderate 1 Moderate I Moderate

Nates Rlerence Mod~lhed from ENCON (2Ma) .Append~x L, Secllon 3 0 - ConlmlnaDm Polenlla and Conclunmr

Low Low

Gasoline-Range Organics

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Low

Soil

Water

Unknown

Low

Unknown

Low

Low

Moderate

Unlikely

Low

Unlikely

Low

Low

Low

Moderate

Low

Unlikelv

Unlikely

Unlikely

Unlikely

Unlikely

Low

Moderate

Techntcol Mernoro,zdrr,n - Conceprunl Design Sfud?

Replnce,nmr Cnnol Litling

Antericon Cortol

Facility-specific issues are identified below.

1.2.1 USIBWC American Dam Facility. The USIBWC operates its field office for the American Dam at 2616 Paisano Drive (west of Paisano), at the north end of the upper channel.

The IBWC had reported leaking underground storage tanks (USTs) with soil and groundwater impacts with threats to surface water. Benzene concentrations as high as 4,600 micrograms per Liter ( u a ) were reported in September 1994; concentrations in this same well had decreased to 12 u a by November 1997. Total dissolved solids ranged from 1,700 to 3,100 milligrams per 11ter ( m a ) . The case is currently listed as closed for LPST ID #108049, Facility ID# 0009971.

Remedial act~vities were considered complete in July 1998; seven monitoring wells were plugged and abandoned by March 1999 (TNRCC, 2001).

Borehole 1 and monitoring well 1 was installed by MWH near this location to evaluate whether environmental impacts exist that could adversely impact construction activities.

1.2.2 ASARCO Smelter. The ASARCO facility is located at 2699 West Paisano Drive (east of Paisano). In the late 1980s. the entrance of free hydrocarbons into the American Canal was observed near the outlet of the upstream closed conduit segment. Investigation found the source of the hydrocarbons to be a leaking diesel fuel storage tank on the ASARCO property. Once the soume was identified, ASARCO began pumping groundwater at strategic locations along the open channel along the north side of Paisano Drive in order to intercept the diesel plume before it could enter the canal. Despite this remedial action undertaken by ASARCO, i t is possible that residual hydrocarbons may remain in the soils and groundwater adjacent to and underlying the American Canal. In the event that construction of the new canal lining will require the excavation of contaminated soils associated with ASARCO activities, it was indicated by USIBWC to MWH that AS ARC0 would be responsible for disposal of all soil found to contain contaminants from its leaking diesel fuel storage tank.

In addition to the potential for hydrocarbon contaminants in soil and groundwater, the ASARCO smelting operation, used to process lead and copper ores since 1887, has been cited by the U.S.

Environmental Protection Agency (EPA) for regional lead contamination resulting in lead poisoning among residents living in Smeltertown (Department of Justice, 1999). Following a lawsuit filed by the City of El Paso and the State of Texas alleging that the smelter was the principal source of particulate lead within a one-mile radius of the smelter, ASARCO purchased the Smeltertown properties in 1975, removed the residents, razed the town, and removed the upper few feet of soils contaminated with lead (Handbook of Texas Online, 2000). Based on the regional deposition of metals associated with the ASARCO smelting operations, lead, arsenic, cadmium, and selenium were identified as constituents of concern. Information on regional impacts associated with ASARCO's historic operations is provided in Appendix C.

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Additional recent soil and groundwater data was requested by MWH from ASARCO to assist with data evaluation on August 2, 2001 (MWH, 2001~). ASARCO's environmental consultant, Hydrometrics, Inc. responded with a data package received on August 20,2001 (Hydrometrics.

2001) providing summaries'of soil and groundwater analytical data, soil boring logs and well completion diagrams, and groundwater elevation and free product thickness data (Hydrometrics, 2001). The Hydrometrics data package included only a cursory overview of groundwater remediation systems and other facilities. ASARCO information suggested only limited hydrocarbons were remaining in wells within 200 feet of the American Canal ROW. Review of the information provided by AS ARC0 did not substantially modify the proposed environmental drilling and sampling program.

1.2.3 Bell Thunderbird Facility. The Bell Thunderbird Facility is located at 2000 West Paisano (west of Paisano). The site has also had documented releases from underground storage tanks, with the primary constituents of concern identified as hydrocarbons. Heavy metals have also been detected in groundwater at this site (ENCON, 2000).

1.2.4 Paisano Auto Salvage. Paisano Auto Salvage is located at 1908 West Paisano Drive (west of Paisano). This site was evaluated for hydrocarbons in 1992 (ENCON, 2000). A database listing dated May 1, 2001 indicated that the Paisano site LPST case is closed (LPST ID#095371, Facility ID 0001602) (TNRCC, 2001).

1.2.5 USIBWC International Dam Facility. The USIBWC also operated underground storage tanks at its International Dam facility located in the southern channel area west of Paisano (LPST ID 107801, Facility ID - NA) (TNRCC, 2001). A completion of corrective action requirements was issued by the TNRCC in February 1997. The former underground storage tank was located across from the generator shed.

1.3 Report Organization

This Technical Memorandum deals exclusively with soil and groundwater contamination assessment and environmental impacts on proposed construction activities. It is organized into the following sections:

Section 1 -Introduction

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Atrtericon Conal

Section 2 -Objectives

Section 3 -Field Investigation

Section 4 -Results

Section 5 -Discussion

Section 6 -Conclusions and Recommendations

Section 7 -References, Supporting materials including analytical laboratory data, and Occupational Safety and Health Administration (OSHA) Lead in Construction (29 Code of Federal Regulations [CFR] 1926.62) (OSHA, 2001). and information regarding the regional impacts from the ASARCO smelter are provided in appendices.

Other supporting information collected during the environmental and geotechnical drilling programs will be provided with the later Conceptual Design study. This information includes geotechnical boring logs, results of geotechnical testing, monitoring well completion diagrams, and groundwater elevation data.

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Trch,,icnl Mrmornnd,rm - Concrprunl Design Stud?

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American Co,lol

2.0 OBJECTIVES

Environmental sampling was performed by MWH to identify possible environmental concerns associated with potentially contaminated soils and groundwater that might be encountered during planned construction activities along the American Canal ROW. Sampling results were used to evaluate potential worker exposures during construction and to evaluate the need for specialized permits and disposal requirements for potentially contaminated soils and groundwater encountered during construction.

The objectives of the environmental investigations performed by MWH along the American Canal ROW were as follows:

Establish whether soil and/or groundwater contaminants are of concern at concentrations posing risks to workers participating in the American Canal project

Estimate the impacted areas and amount of contaminated soil and/or groundwater that would require special handling due to environmental concerns

Identify practices and requirements needed for workers to safely perform required construction activities in areas of contaminated soil and/or groundwater

Identify management, storage, disposal, and permitting requirements associated with contaminated soils and/or groundwater, if identified

Co-locate environmental borings with geotechnical borings to maximize cost-effectiveness

Provide analytical data to geotechnical contractor to ensure geotechnical testing personnel use appropriate safety measures when analyzing soil samples for geotechnical properties

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3.0 APPROACH

3.1 Sampling and Analysis Plan

MWH prepared a Sampling and Analysis Plan (SAP) (MWH, 2001) to guide environmental investigation activities for the American Canal project. The SAP identified sixteen (16) environmental/geotechnical borings along the ROW, with an additional possible four soil borings in reserve. Up to nine (9) groundwater monitoring wells were identified for installation, development, and sampling, with the condition that if recent (>January 2000) appurtenant environmental data was obtained from adjacent property owners as to environmental impacts within 200 feet of the American Canal ROW, monitoring wells could be eliminated from the program.

Environmental field investigation activities proposed by MWH included the following tasks:

Subsurface sampling and analysis of fifteen (15) soil borings, with an additional five discretionary borings not to exceed 100 feet of additional drilling

Installation and sampling of up to eight shallow groundwater monitoring wells for analysis of chemical constituents in groundwater and groundwater elevation measurement

Additional geotechnical investigations performed by Law Crandall included:

Analysis of soil samples for chemical and physical properties pertaining to geotechnical evaluations associated with the American Canal project sampled at the direction of Law Crandall

Seismic refraction survey conducted by Law Crandall Engineering to evaluate the extent of hard rock sections and oversized materials to aid in the evaluation of rippability

The results of this Technical Memorandum discuss on!y those activities and samples collected by MWH during the environmental investigation.

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3.2 Field Investigation

During August 27 to September 1 I, 2001, MWH staff drilled and sampled eighteen (18) soil borings to depths ranging from 3 to 45 feet. Seven groundwater monitoring wells were installed, developed, and sampled. Boring and monitoring well locations for the upper, middle and lower channel areas are shown on Figures 3-1.3-2, and 3-3, respectively.

Analyses were submitted for metals, volatile organic constituents (VOCs), and semi-volatile organic constituents (SVOCs). The environmental sampling program performed by MWH is summarized in Table 3-1. Sampling procedures were defined in the SAP (MWH, 2001a).

Table 3-1. American Canal Sampling and Analyses Summary 1 1 Sample Depth and Soil Chemical 1 I I

Location

Figure3-1

Analysis Water

Surface (RCRA Metals)

BTEX

2.5 ft bgs and 5 R bgs(RCRA Metals PAHs TPH, BTEX. and PAHs) RCRA metals

10.0 R bgs and every 5 R

thereaRer(TPH. BTEX, and PAHs)

Total chemical sample depth not t o exceed depth specified in

Comments Column or depth to groundwater.

Comments

Proposed TD of 20 ft.

IDW to be stored on IBWC property.

8-2

B-3lMW-2

1 RCRA metals 1

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Figure3-1

Figure3-1

8-4 I

8-5

IDW lo be stored on a e

As indicated for 6-1

As indicated for 6-1

Figure3-1

Not applicable

As indicated for 6-1

Proposed TD of 20 ft.

IDW to be stored on

Not Applicable

TPH

BTEX

P AHs

Proposed TD of 20 tt.

IDW to be stored on

Proposed TD of 20 tt.

IDW to be stored on ASARCO property

Technical Memorandum - Conceptual Desisn Slud?

Replocemenl Car!ai Lining

Americun Canal

Table 3-1. American Canal Sampling and Analysis Summary (concluded) B-6IMW-3 1 Figure3-l 1 As indicated for B-1 1 TPH 1 Pro~osed TD of 20 ft.

I D V ~ to be stored on ASARCO property

B-7lMW-4

0-8

B-9IMW-5

Figure 3-2

0-1 0

B-1 1

Figure 3-2

Figure 3-2

6-12

6-13

As indicated for B-1

Figure 3-2

Figure 3-3

B-14lMW-7

As indicated for B-1

As indicated for 0-1

Figure 3-3

Figure 3-3

6-15

0-1 6

RCRA metals

TPH

BTEX

PAHs

As indicated for 0-1

As indicated for 0-1

Figure 3-3

8-1 7

PSARCO; hencan Srdbng and Rdnlng CanFay PAH = polynuclear m a u c h y d m h B = rull b n g RCRA = R a m &mewahon and Remvery Ad MW = manlmnnp MI surtax =zwoto 4 lmtm ba, @=Ma grmrd ourlre TPH = tM pidm hydrocam BTEX = h m . Idme. ethvlteum, and 94ms TtklM&#l EPA; U S EmrrmmonU Pmte2hm&axy IDW- ~menbgabm &wed m t e h = W e e t sWC= lntemabonal Baunddly Water Crmmlsslm

Proposed TD of 30 ft.

IDW to be stored on ASARCO property

RCRA metals Not applicable

TPH

BTEX

PAHs

As indicated for 0-1

As indicated for 0-1

Figure 3-3

Figure 3-3

B-18IMW-6

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Proposed TD of 30 ft.

IDW to be stored on IBWC property.

Proposed TD of 60 ft.

IDW to be stored on IBWC property.

RCRA metais Not Applicable

TPH

BTEX

P AHs

As indicated for B-1

Figure 3-3

Proposed TD of 60 ft.

IDW to be stored on IBWC property Proposed TD of 20 ft.

IDW to be stored on IBWC property.

RCRA metals Not Applicable

Not Applicable

As indicated for B-1

As indicated for 0-1

Wlr

Figure 3-3

Proposed TD of 20 ft.

IDW to be stored on lBWC property.

Proposed TD of 20 ft.

IDW to be stored on

TPH

BTEX

PAHs

As indicated for B-1

IBWC property Proposed TD of 20 ft.

IDW to be stored on IBWC property

RCRA metals Not Applicable

TPH

BTEX

PAHs

As indicated for 0-1

Proposed TD of 20 ft.

IDW to be stored on IBWC property Proposed TD of 20 ft.

IDW to be stored on IBWC property

RCRA metals

TPH

BTEX

PAHs

Proposed TD of 20 ft.

IDW to be stored on IBWC property

RCRA metals

TPH

BTEX

PAHs

RCRA metais

Proposed TD of 20 ft.

IDW to be stored on IBWC property

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Legend:

Soil Bonng (B) andlor Morulonng Well (MW) Locauon

UPPER AREA

AMERICAN CANAL

Figure: 3-1

Replacement Canal Lining American Canal Reach F

El Paso, Texas

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TechnicolMemomndum - Cmcephrol Design SNdv Replacmen! Caw1 Lining

American Cowl

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MIDDLE AREA

AMERICAN CANAL

Figure: 3-2

Replacement Canal Lining American Canal Reach F

El Paso, Texas

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~DNTGOUERYWLTSON HARIA

Technical Afemomndurn - Cmcephrol Design S ~ d y Replacemerrt CanalLinetg

.-lmericon Cam1

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Soil Bomg [BI andor Manilonne Well (hlWI Locallon

S

Replacement Canal Lining American Canal Reach F

El Paso, Texas

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LOWER AREA

AMERICAN CANAL

Figure: 3 3

Technical Mmrora,,dam - Conce-pteol Design Stud?

Replncrrnmr Ca11a1 Lining

American Carla1

MWH performed environmental sampling in conjunction with the following subcontractors:

Law Crandall, - geotechnical investigation, Tierra Drilling - drilling, Assaigai Analytical Laboratories - analytical laboratory services, and Fraught &Associates - surveyor. Texas One- Call, and site-specific utility locating was performed prior to the start of drilling. All field activities were coordinated with a site-specific Health and Safety Plan prepared for this investigation by MWH (MWH, 2001b).

Work performed in the ROW along ASARCO was performed with coordination and cooperation of the ASARCO environmental coordinator. Work along the ROW including the railroad tracks in the central section of the site (Railroad Milepost 1154, El Paso, Line Segment 7300) was performed in cooperation with Burlington Northern Santa Fe (BNSF) railway and the BNSF Roadmaster and flagman.

Analyses were submitted for metals, volatile organic constituents (VOCs), and semi-volatile organic constituents (SVOCs). The environmental sampling program performed by MWH is summarized in Table 3-1. Sampling procedures were defined in the SAP (MWH, 2001a).

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4.0 RESULTS

The results of environmental sampling performed on soil samples collected from eighteen borings are summanzed in Table 4-1. Concentrations detected for heavy metals, VOCs, and SVOCs, were compared against EPA Region 6 Human Health Risk-Based (HHRB) Screening Levels for industrial and residential land use. Industrial screening levels are most appropriate to current land use considerations in and around the American Canal ROW. However, residential screening levels are useful to identify constituents that may pose additional risks to human health and the environment and are often used to define the level to which construction worker protection standards are required.

4.1 Surface and Subsurface Soils

4.1.1 Metals. The upper five feet of each soil boring was sampled and analyzed for the presence of metals. Samples were collected at ground surface, and then at 2.5 and 5 feet (ft) below ground surface (bgs) at each boring location. Soil samples were analyzed for RCRA metals including: arsenic, barium, cadmium, chromium, selenium, silver, lead, and mercury. Of these constituents, only arsenic and lead were detected at concentrations above EPA HHRB screening levels.

Arsenic was routinely detected at concentrations above industrial screening level of 2 milligrams per kilogram (mglkg), ranging from ~ 3 . 0 mglkg to 113 mglkg. Arsenic concentrations were typically higher in borings located in the northern and central sections of the ROW.

- Lead was occasionally detected at concentrations above both the residential and industrial screening levels of 400 and 2.000 mglkg, respectively. Lead concentrations ranged from <5.0 to 3,500 mglkg. Similar to the distribution observed for arsenic, lead concentrations were also higher in borings located in the northern and central sections of the ROW. Lead concentrations in the southern section of the ROW did not exceed 50 mglkg.

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American Canoi

Table 4-1. Soil Sampling Results Conceptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

Location Identification 8-1 B-1 B-1 B-1 8-2 B-2 B-2 B-2 B-3 B-3 Field Sample Identification B-1-0.0 B-1-23 B-1-5.0 B-1-10.0 B-2-0.0 B-2-2.5 B-2-5.0 B-2-10.0 B-3-0.0 B-3-2.5

Sample Type Surface Subsurface Subsurface Subsurface Surface Subsurface Subsurface Surface Subsurface Subsurface Date Collected 08/28/01 08/28/01 08/28/01 08/28/01 08/28/01 08/28/01 08/28101 08/28/01 08/28/01 08/28/0 1

Depth (ft) 0 2.5 5 10 0 2.5 5 10 0 2.5 Matrix Soil Soil Soil Soil Soil Soil Soil Soil Soil Soil

Lab Sample ID 1337.43 1337.44 1337.45 1169.12 1337.57 1337.58 1337.59 1169.22 1337.54 1337.55 Analyte /Method (Units)

Metals by ICPISW-846 3050A/6010A

(mg/kg)

Arsenic Barium

Cadmium

Chromium Selenium

Silver

Lead by AA-FWSW-846 3050Af7000 Series AA-FL (mg/Kg)

Lead

EPA HHRB Screening Levels Residential Industrial

0.39 2.0 5,400 83,000

39 630

210 5 m 390 6.400 390 6,400

MercurylSW-846 7471 CVAA (mgllrg) Mercury 23

Total Petroleum Hydrocarbons/SW- 846 8015B (mgllrg)

Gasoline range organics (C6-C10) NE Diesel range organics (>C10-C28) NE

Volatile Organic ComponndslSW-846 5030A18021B (mg/kg)

Benzene 0.68 1.8 N A <Om5 <0.005 <0.005 N A <0.005 <0.005 <0.005 N A <0.005 Ethylbenzene 230 230 N A <0.005 <0.005 <0.005 N A <0.005 <0.005 <0.005 N A <0.005 Toluene 520 520 N A <0.005 <0.005 <0.005 N A <0.005 <0.005 <0.005 N A <0.005 o-Xylenes 280 280 NA <0.005 <0.005 <0.005 N A <0.005 <0.005 <0.005 N A <0.005 plm-Xylenes 210 210 N A <0.01 <0.01 <0.01 N A <0.01 <0.01 <0.01 N A <0.01

MWH 4-2 10/15101

Gchnrcal Memorandum - ConceplualDesrgn Study Replacement Canal Ltning

Amencan (anal

Table 4-1. Soil Sampling Results Conccptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

Location Identification B-1 B-1 B-1 B-1 B-2 B-2 8-2 B-2 B-3 B-3 Field Sample Identification B-1-0.0 8-1-2.5 B-1-5.0 B-1-10.0 B-2-0.0 B-2-2.5 8-2-5.0 B-2-10.0 B-3-0.0 B-3-2.5

Sample Type Surface Subsurface Subsurface Subsurface Surface Subsurface Subsurface Surface Subsurface Subsurface Date Collected 08/28/01 08/28/01 08/28/01 08/28/01 OeJ28/01 08/28/01 08128/01 08/28/01 08/28/01 OSnslOl

Depth (It) 0 2.5 5 10 0 2.5 5 10 0 2.5 Matrix Soil Soil Soil Soil Soil Soil Soil Soil Soil Soil

Lab Sample ID 1337.43 1337.44 1337.45 1169.12 1337.57 1337.58 1337.59 1169.22 1337.54 1337.55 Analyte I Method (Units)

Semi-Volatile Organic Compouods/SW- 846 8270B (mgkg)

1-Methylnaphthalene 2-Methylnaphthalene Acenaphthene Acenaphthylene Anthracene Benzo(a)anthracene

Benzo(a)pyrene Benzo(b&k)tluoranthene Benzo(g,h,i)peryleee Chrysene Dibenz(a,h)anthracene Fluoranthene Fluorene Indeno(l,2,3-c,d)Pyrene Naphthalene Phenanthrene Pyrene

EPA HHRB Screening Levels Residential Industrial

NE NE

NE NE

3,700 37,000

NE NE

22,000 100,000

0.62 2.6

0.062 0.26

0.62 2.6

NE NE

62 260

0.062 0.26 2,300 28,000 2,600 29,000

0.62 2.6 56 240 m NE

2.300 36,000

F Analyte was positively idenlilied but the assoc~ated numerical value is below the practical quantitation limit and is consdered estimated.

UB Analyte considered not detected UK Analtye considered not detected based on the data valdiation.

1 Data are estimated NA Not Analyzed NE Not ~s tab l i shed

Indicates value exceeding Industrial Screening Level

Indicates value exceeding Residential Screening Level

MWH 4-3 lWl5lOl

Technical Memorandum - Conceptual Design Slrrdy Replacement Canal Lintng

American Canal

Table 4-1. Soil Sampling Results Conceptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

Location Identification B-3 B-4 B-4 B-4 B-4 B-5 B-5 8-5 B-6 B-6 B-6 Field Sample Identification B-3-5.0 B-4-0.0 B-4-2.5 B-4-5.0 B-4-10.0 B-5-0.0 B-5-2.5 B-5-5.0 B-6-0.0 8-6-2.5 B-6-5.0

Sample Type Subsurface Surface Subsurface Subsurface Surface Subsurface Subsurface Subsurface Subsurface Surface Subsurface Date Collected 08/28/01 08/28/01 08/28/01 08/28/01 08/28/01 08/28/01 08/28/03 08/28/01 08/27/01 08127101 08/27/01

Depth (Tt) 5 0 2.5 5 10 0 2.5 5 0 2.5 5 Matrix Soil Soil Soil Soil Soil Soil Soil Soil Soil Soil Soil

Lab Sample ID 1337.56 1137.49 1337.50 1337.53 1169.17 1337.46 1337.47 1337.48 1337.36 1337.41 1337.42 Analyte I Method (Units)

Metals by ICPlSW-846 3050A/6010A

(mgkg)

Arsenic Barium

Cadmium Chromium

Selenium Silver

Lead by AA-FLISW-846 3050A/7000 Series AA-FL (mglKg)

Lead

MercurylSW-846 7471 CVAA (mgkg) Mercury

Total Petroleum HydrocarbonslSW- 846 8015B (mgkg)

Gasoline range organics (C6-C10) Diesel range organics (>CIO-C28)

Volatile Organic CompoundslSW-846 5'030AB021~ (mgntg)

Benzene Ethylbenzene Toluene o-Xylenes plm-Xylenes

EPA HHRB screen in^ Levels Residential ~ndustrial

0.39 2.0 N A 5,400 83,000 1 74 I08 128 143 N A 151 103 144 131 116

39 630 1.07 9.86 0.53 4.94 N A 2.79 3.51 9.82 fi 0.28 1.54 210 560 8.6 6.2 7.6 8.0 N A 8.7 7.3 6.3 4.2 7.8 10.0

MWH 44 10/15/01

Technical Memorandum - Concepiual Design Study Reolacemenr Conol L.inin~ "

American Conol

Location Identification Field Sample Identification

Sample Type Date Collected

Depth (ft) Matrix

Lab Sample ID Analyte / Method (Units)

Table 4-1. Soil Sampling Results Conceptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

6-3 6-4 6-3-5.0 6-4-0.0

Subsurface Surface 08/28/01 08/28/01

5 0 Soil Soil

1337.56 1137.49

B-4 6-4 6-4 8-4-2.5 8-4-5.0 8-4-10.0

Subsurface Subsurface Subsurface 08/28/01 06/28/01 08/28/01

2.5 5 10 Soil Soil Soil

1337.50 1337.53 1169.17

Semi-Volatile Organic CompounddSW.

846 82706 (mgikg)

I-Methylnaphthalene 2-Methylnaphthalene Acenaphthene Acenaphthylene Anthracene Benzo(a)anthracene Benzo(a)pyrene Benzo(b&k)fluoranthene Benzo(g,h,i)perylene Chrysene Dibenz(a,h)anthracene Fluoranthene Fluorene Indeno(l,2,3-c.d)Pyrene Naphthalene Phenanthrene Pyrene

EPA HHRB Screening Levels Residential Industrial

NE NE

NE NE

3,700 37,000

NE NE

22,000 100,000

0.62 2.6

0.062 0.26

0.62 2.6

NE NE

62 260

0.062 0.26

2.300 28,000 2,600 29.000

0.62 2.6 56 240

NE NE

2,300 36,000

6-5 6-5-0.0

Surface 08/28/01

Soil

1337.46

N A N A

NA

N A N A

NA

N A

NA

NA

N A

NA

N A N A N A N A N A N A

6 - 5 6-5-25

Subsurface 06/28/01

2.5 Soil

1337.47

B-5 8-5-5.0

Subsurface 08128/01

Soil

1337.48

6-6 6-6-0.0

Surface 08/27/01

Soil

1337.36

6-6 B-6-2.5

Subsurface 08/27/01

2.5 Soil

1337.41

6-6 6-6-5.0

Subsurface 08/27/01

Soil

1337.42

F Analyte was positively identified but the associated numerical value is below the practical quantitation limit and is consdered estimated.

UB Analyte considered not detected UK Analtye considered not detected based on the data valdiation.

I Data are estimated NA Not Analyzed NE Not ~ s t ~ b l i s h e d

Indicates value exceeding Industrial Screen Indicates value exceeding Residential Scree

Technical Memorandrim - Conceptual Design Study

American Conal

Table 4-1. Soil Sarn~linp. Results - Conceptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

Location Identificalion B-7 B-7 8-7 B-7 B-7 B-8 B-8 B-8 B-8 Field Sample Identification B-7-0.0 8-7-2.5 8-7-5.0 B-7-10.0 B-7-15.0 8-8-0.0 8-8-2.5 8-8-5.0 B-8-10.0

Sample Type Surface Subsurface Subsurface Subsurface Surface Subsurface Subsurface Subsurface Subsurface Dale Collected 08/27/01 08/27/01 08/27/01 08/27/01 08/27/01 08/27/01 OSR7101 08/27/01 08/27/01

Depth (ft) 0 2.5 5 10 15 0 2.5 5 10 Matrix Soil Soil Soil Soil Soil Soil Soil Soil Soil

Lab Sample ID 1380.44 1380.47 1337.42 1273.2 1273.3 1380.49 1380.5 1380.53 1250.7 Analyte / Method (Units)

Metals by ICPISW-846 3050A16010A

(mgntg)

Arsenic Barium

Cadmium Chromium

Selenium Silver

Lead by AA-FLISW-846 3050A/7000 Series AA-FL (mg/Kg)

Lead

MercuryISW-846 7471 CVAA (mgntg) Mercury

Total Pelroleum HydrocarbonsISW- 846 8015B (mglkg)

Gasoline range organics (C6-C10) Diesel range organics (>C IO-C28)

Volatile Organic CompoundJSW-846 5030A/S021B (mgkg)

Benzene Ethylbenzene Toluene o-Xylenes plm-Xylenes

EPA HHRB Screening Levels Residential Industrial

0.39 2.0 N A

5.400 83,MM 135 224 N A

39 630 1 127 I 83.6 i N A

2 10 560 6.3 7.2 N A 390 6,400 7.4 7.0 N A 390 6,400 15.4 17.4 N A

Technic01 Memorandum - Conceplual D e ~ i g n Study Replacement Canal Linlng

Americon Canal

Table 4-1. Soil Sampling Results Conceptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

Location Identification B-7 8-7 B-7 B-7 B-7 B-8 B-8 B-8 B-8 Field Sample Identification 8-7-0.0 8-7-2.5 8-7-5.0 8-7.10.0 8-7-15.0 8-8-0.0 8-8-2.5 8-8-5.0 8.8-10.0

Sample Type Surface Subsurface Subsurface Subsurface Subsurface Surface Subsurface Subsurface Subsurface Date Collected 08/27/01 08/27/01 08/27/01 08/t7/01 08/27/01 08/27/01 06/27/01 08n7N)l 08/27/01

Depth (ft) 0 2.5 5 10 15 0 2.5 5 10 Matrix Soil Soil Soil Soil Soil Soil Soil Soil Soil

Lab Sample ID 1380.44 1380.47 1337.42 1273.2 1273.3 1380.49 1380.5 1380.53 1250.7 Analyte 1 Method (Unit.)

Semi-Volatile Organic CompoundsISW- 846 S270B (mgkg) EPA HHRB Screening Levels

Residential Industrial 1-Methylnaphthalene NE NE N A <0.03 N A <0.03 <0.03 N A <0.03 <0.03 <0.03 2-Methylnaphthalene NE NE N A <0.03 NA <0.03 ~ 0 . 0 3 N A <0.03 <0.03 ~ 0 . 0 3 Acenaphthene 3.700 37,000 N A <0.03 N A <0.03 0.12 N A <0.03 <0.03 <0.03 Acenaphthylene NE NE N A ~ 0 . 0 3 N A <0.03 <0.03 N A <0.03 ~ 0 . 0 3 <0.03 Anthracene 22,000 100,000 N A <0.03 N A <0.03 <0.03 N A <0.03 <0.03 <0.03 Benzo(a)anthracene 0.62 2.6 N A <0.03 N A <0.03 <0.03 N A <0.03 <0.03 0.054

Benzo(a)pyrene 0.062 0.26 N A <0.03 N A <0.03 <0.03 N A <0.03 <0.03 0.048

Benzo(b&k)fluoranthene 0.62 2.6 N A 0.070 N A ~ 0 . 0 3 <0.03 N A <0.03 <0.03 0.084 Benzo(g,h,i)pery lene NE NE N A <0.03 N A <0.03 ~ 0 . 0 3 N A <0.03 <0.03 <0.03 Chrysene 62 260 N A 0.052 N A <0.03 ~ 0 . 0 3 N A ~ 0 . 0 3 <0.03 0.052 Dibenz(a,h)anthracene 0.062 0.26 N A <0.03 N A <0.03 <0.03 NA 4 . 0 3 <0.03 <0.03 Fluoranthene 2,300 28.000 N A 0.060 N A <0.03 <0.03 N A <0.03 <0.03 0.12 Fluorene 2,600 29,000 N A <0.03 N A <0.03 0.18 N A ~ 0 . 0 3 <0.03 <0.03 Indeno(l.2.3-c.d)Pyrene 0.62 2.6 N A <0.03 N A <0.03 <0.03 N A <0.03 <0.03 <0.03 Naphthalene 56 240 N A <0.03 N A <0.03 <0.03 N A <0.03 <0.03 <0.03 Phenanthrene NE NE N A 0.050 N A <0.03 0.10 NA <0.03 <0.03 0.11 Pyrene 2,300 36.000 N A 0.047 NA <0.03 0.14 N A <0.03 <0.03 0.10

F Analyte was positively identified bnt the associated numerical value is below the practical quantitation limit and is consdered est~rnated.

UB Analyte considered not detected U K Analtye considered not detected based on the data valdiation.

J Data are est~mated NA Not Analvzed NE Not ~s tab l l shed

Ind~cates value exceeding Industrial Screen

Indicates value exceeding Residential Screr

Technical Memorandum - Conceptual Design Stud?

Replacemenr Canol Lining

American Canal

Table 4-1. Soil Sampling Results Conceptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

Location Identification 6-9 B-9 B-10 B-10 B-11 B-11 6-11 B-11 Field Sample Identification B-9-0.0 8-9-2.5 B-10-0.0 B-10-15 B-11-0.0 8-11-2.5 8-11-5.0 8-11-10.0

Sample Type Surface Subsurface Surface Subsurface Surface Subsurface Subsurface Subsurface Date Collected 09/05/01 09/05/01 09/05/01 09/05/01 08/29/01 08/29/01 08/29/01 08/29/01

Depth (ft) 0 2.5 0 2.5 0 2.5 5 10 Matrix Soil Soil Soil Soil Soil Soil Soil Soil

Lab Sample ID 1369.31 1369.32 1369.29 1369.30 1337.22 1337.23 1337.24 1194.16 Analyte I Method (Units)

Metals by ICPISW-846 3050Al6010A

(mgntg)

Arsenie Barium

Cadmium Chromium

Selenium Silver

Lead by AA-FLISW-846 3050Afl000 Series AA-FL ( m m g )

Lead

MercuryBW-846 7471 CVAA (mgntg) Mercury

Total Petroleum HydrocarbonsISW- 846 80158 (m&)

Gasoline range organics (C6-C10) Diesel range organics (>CIO-C28)

Volatile Organic CompoundsJSW-846 5030A18021B (mgntg)

Benzene Ethylbenzene Toluene o-Xylenes p/m-Xylenes

EPA HHRB Screening Levels Residential Industrial

0.39 2.0 5,400 83,000

39 630 210 5 60 390 6,400

Technical Memorandum - Conceptual Dcrrgn Stud) Replocement Canal Lining

American Canal

Table 4-1. Soil Sampling Results Conceptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

Location Identification B-9 B-9 B-10 B-10 B-11 B.11 B-11 B-11 Field Sample Identification B-9-0.0 8-9-2.5 B-10-0.0 B-10.2.5 B-11-0.0 8-11-2.5 8.11-5.0 8-11-10.0

Sample Type Surface Subsurface Surface Subsurface Surface Subsurface Subsurface Subsurface Date Collected 09/05/01 09/05/01 09/05/01 09/05/01 08/29/01 08/29/01 08129/01 08/29/01

Depth (ft) 0 2.5 0 2.5 0 2.5 5 10 Matrix Soil Soil Soil Soil Soil Soil Soil Soil

Lab Sample ID 1369.31 1369.32 1369.29 1369.30 1337.22 1337.23 1337.24 1194.16 Analyte I Method (Units)

Semi-Volatile Organic CompoundsISW- 846 82708 (mgkg) EPA HHRB Screening Levels

Residential Industrial I-Methylnaphthalene NE NE NA 0.066 N A d . 0 3 N A <0.03 <0.03 <0.03 2-Methylnaphthalene NE NE N A 0.077 N A <0.03 N A <0.03 4 . 0 3 <0.03 Acenaphthene 3.700 37,000 NA <0.03 N A <0.03 N A <0.03 4 . 0 3 4 . 0 3 Aeenaphthy lene NE NE N A <0.03 N A <0.03 N A <0.03 <0.03 ~ 0 . 0 3 Anthracene 22,000 100,000 N A <0.03 N A <0.03 N A 4 . 0 3 4 . 0 3 4 . 0 3 Benzo(a)anthracene 0.62 2.6 N A 0.039 N A <0.03 N A <0.03 4 . 0 3 <0.03

Benzo(a)pyrene 0.062 0.26 N A 0.035 NA <0.03 N A 4 0 3 <0.03 <0.03

Benzo(b&k)fluoranthene 0.62 2.6 N A 0.094 N A <0.03 N A <0.03 4 . 0 3 <0.03 Benzo(g,h,i)perylene NE NE N A <0.03 NA <0.03 N A <0.03 <0.03 -303 Chrysene 62 260 N A 0.066 N A <0.03 N A <0.03 4 . 0 3 <0.03 Dibenz(a,h)anthracene 0.062 0.26 N A <0.03 NA <0.03 N A <0.03 <0.03 <0.03 Fluoranthene 2,300 28,000 N A 0.12 NA <0.03 NA <0.03 <0.03 ~ 0 . 0 3 Fluorene 2,600 29,000 N A <0.03 N A <0.03 N A <0.03 4 . 0 3 4 . 0 3 Indeno(l.2.3-c,d)Pyrene 0.62 2.6 N A 4 0 3 NA <0.03 N A 4 . 0 3 4 . 0 3 -3.03 Naphthalene 56 240 N A <0.03 N A <0.03 NA <0.03 <0.03 4 . 0 3 Phenanthrene NE NE NA 0.077 N A <0.03 N A 4 . 0 3 4 . 0 3 <0.03 Pyrene 2,300 36,000 N A 0.089 N A <0.03 N A <0.03 <0.03 <0.03

F Analyte was positively identified but the associated numerical value is below the practical quantitation limit and is consdered estimated.

UB Analyte considered not detected UK Analtye considered not detected based on the data valdiation.

J Data are estimated NA Not Analyzed NE Not ~s tab l i shed

Indicates value exceeding Indusbial Screen Indicates value exceeding Residential Sc re~

Technical Memorandum - Conceplual Design Study

American Canal

Table 4-1. Soil Sampling Results Conceptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

Location Identification B-12 B-12 8-12 B-13 B-13 B-13 B-14 8-14 B-14 Field Sample Identification 8-12-0.0 8-12.2.5 8.12-5.0 8-13-0.0 8-13-5.0 8-13-10.0 B-140.0 8-142.5 R-14-5.0

Sample Type Surface Subsurface Subsurface Surface Subsurface Subsurface Surface Subsurface Subsurface Date Collected 08/29/01 08/29/01 08/29/01 08/29/01 08/29/01 08/29/01 08/29/01 08/29/01 08/29/01

Depth (It) 0 2.5 5 0 5 10 0 2.5 5 Matrix Soil Soil Soil Soil Soil Soil Soil Soil Soil

Lab Sample ID 1337.20 1337.21 1161.8 1337.18 1337.19 1161.6 1337.13 1337.14 1337.17 Analyte I Metbod (Units)

Metals by ICPISW-846 3050A16010A

(mg/kg)

Arsenic Barium

Cadmium Chromium

Selenium Silver

Lead by AA-FLISW-846 3050M000 Series AA-FL (mgn<g)

Lead

MercurylSW-846 7471 CVAA (mgkg) Mercury

Total Petroleum HydroearbonslSW- 846 8015B (mg/kg)

Gasoline range organics (C6-C10) Diesel range organics (>C10-C28)

Volatile Organic CompounddSW-846 5030ARI021B (mgkg)

Benzene Ethylbenzene Toluene o-Xylenes plm-Xylenes

EPA HHRB Screening Levels Residential ~ndustrial

0.39 2.0 N A N A 5,400 83,000 208 124 N A 144 122 N A 152 326 215

Technical Memorandum - Conceptual Dertgn Pudy

American Canal

Table 4-1. Soil Sampling Results Conceptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

Location Identification B-12 B-12 Field Sample Identification B-12-0.0 8-122.5

Sample Type Surface Subsurface Date Collected 08/29/01 08/29/0 1

Depth (ft) 0 2.5 Matrix Soil Soil

Lab Sample ID 1337.20 1337.21 Analyte I Method (Units)

Semi-Volatile Organic CompoundsISW- 846 8270B (mgkg) EPA HHRB Screening Levels

Residential Industrial I-Methylnaphthalene NE NE N A <0.03 2-Methylnaphthalene NE NE N A <0.03 Acenaphthene 3,700 37.000 NA <003 Acenaphthylene NE NE N A <0.03 Anthacene 22,000 100.000 N A <0.03 Benzo(a)anthracene 0.62 2.6 N A <0.03

Benzo(a)pyrene 0.062 0.26 N A <0.03

Benzo(h&k)fluoranthene 0.62 2.6 N A <0.03

Benzo(g,h,i)perylene NE NE N A <0.03 Chrysene 62 260 N A ~ 0 . 0 3 Dihenz(a,h)anthracene 0.062 0.26 N A <0.03 Fluoranthene 2,300 28,000 N A <0.03 Fluorene 2,600 29,000 N A ~ 0 . 0 3 Indeno(l.2.3-c,d)Pyrene 0.62 2.6 N A <0.03 Naphthalene 56 240 N A <0.03 Phenanthrene NE NE N A ~ 0 . 0 3

Pyrene 2,300 36,WO N A ~ 0 . 0 3

B-12 B-13 B-13 8-13 B-14 B-14 B-14 B-12-5.0 8-13-0.0 B-13-5.0 8-13.10.0 8-140.0 B-14-2.5 8-14-5.0

Subsurface Surface Subsurface Subsurface Surface Subsurface Subsurface 08/29/01 08/29/01 08/29/01 08/29/01 08/29/0 1 08/29/01 08/29/01

5 0 5 10 0 2 5 5 Soil Soil Soil Soil Soil Soil Soil

1161.8 1337.18 1337.19 1161.6 1337.13 1337.14 1337.17

F Analyte was posilively identified but the associated numerical value is helow the practical quantitation limit and is consdered estimaad.

UB Analyte considered not detected UK Analtye considered not detected based on the data valdiation.

J Data are estimated NA Not Analyzed NE Not Established

Indicates value exceeding Industrial Screen

Indicates value exceeding Residential Scree

MWH 4-11 10/15/01

Technical Memorandum - Conceptual Design SIudy

American Canal

Table 4-1. Soil Sampling Results Conceptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

Location Identification B-15 B-15 B-15 B-16 8-17 B-17 B-17 B-18 B-18 B-18 Field Sample Identification B-15-0.0 B-15-2.5 B-15-5.0 B-16-0.0 B-17-0.0 B-17-5.0 B-17-10.0 B-lSO.0 B-185.0 B-18-10.0

Sample Type Surface Subsurface Subsurface Surface Surface Subsurface Subsurface Surface Subsurface Subsurface Date Collected 08/29/01 08/29/01 08/29/01 08/29/01 08/29/01 09/04/01 09/04/01 09/04/01 09/04/01 09/04/01

Depth (Sl) 0 2.5 5 0 0 5 10 0 5 10 Matrix Soil Soil Soil Soil Soil Soil Soil Soil Soil Soil

Lab Sample ID 1337.8 1337.11 1337.12 1337.25 1369.24 1170.4 1170.5 1369.25 1369.26 1369.29 Analyte 1 Method (Units)

Metals by ICPISW-846 3050Al6010A

( m e t 9

Arsenic Barium

Cadmium Chromium

Selenium Silver

Lead by AA-FLISW-846 3050An000 Series AA-FL (mglKg)

Lead

MercuryISW-846 7471 CVAA (mglkg) Mercury

Total Petroleum HydrocarbondSW- 846 8015B (mgkg)

Gasoline range organics (C6-C10) Diesel range organics (>C10-C28)

Volatile Organic CompounddSW-846 5030AB021B (mgkg)

Benzene Ethylbenzene Toluene o-Xylenes plm-Xylenes

EPA HHRB Screening Levels Residential Industrial

0.39 2.0 5,400 83,000

39 630 210 560

Terhnicul Memorartdurn - Conceplual Design Sludy Replacemml Cunal Lining

American Canal

Table 4-1. Soil Sampling Results Conceptual Design Study of Replacement Canal Lining

American Canal Reach "F", American Dam to International Dam

Location Identification B-15 B-15 8-15 8-16 8-17 B-17 8-17 B-18 B-18 B-18 Field Sample Identification B-15.0.0 B-15-2.5 8-15-5.0 8-16-0.0 B-17-0.0 B-17-5.0 B-17-10.0 B-18-0.0 8.18-5.0 B-18-10.0

Sample Type Surface Subsurface Subsurface Surface Surface Subsurface Subsurface Surface Subsurface Subsurface Date Collected 08/29/01 08/29/01 08/29/01 OSn9/01 08/29/01 09/04/01 09/04/01 09/04/01 09/04/01 09/04/0 1

Depth (ft) 0 2.5 5 0 0 5 10 0 5 10 Matrix Soil Soil Soil Soil Soil Soil Soil Soil Soil Soil

Lab Sample ID 1337.8 1337.11 1337.12 1337.25 1369.24 1170.4 1170.5 1369.25 1369.26 1369.29 Aualytel Method (Units)

Semi-volatile Organic CompounddSW- 846 8270B (mgkg)

I-Methylnaphthalene 2-Methylnaphthalene Acenaphthene…