SOIL INVESTIGATION REPORT FOR WAILOA RIVER STATE ... Soil Investigation Report_06-04-13.pdfJun 04,...

94 Kohola Street, Hilo, Hawaii, USA 96720 • 808.935.8727 99-1046 Iwaena Street, Suite 210A, Aiea, Hawaii, USA 96701 • 808.484.9214

SOIL INVESTIGATION REPORT FOR WAILOA RIVER STATE RECREATION AREA IMPROVEMENT PROJECT HILO, HAWAII 96720 MNA PROJECT 1522_2 STATE PROJECT NO. H-87C836D JUNE 4, 2013

Environmental Studies and Consulting Services

01522_2 ii Myounghee Noh & Associates, L.L.C.

This report is prepared for: Okahara and Associates, Inc. 200 Kohola Street Hilo, Hawaii 96720

SOIL INVESTIGATION REPORT FOR WAILOA RIVER STATE RECREATION AREA IMPROVEMENT PROJECT HILO, HAWAII 96720

MNA Project 1522_2 State Project No. H-87C836D June 4, 2013

Jessica Walsh Environmental Planner

Phillip Cabanila Environmental Consultant/Project Manager Myounghee Noh & Associates, L.L.C. Environmental Studies and Consulting Services 94 Kohola Street, Hilo, Hawaii Tel (808) 935-8727 www.noh-associates.com

Okahara and Associates, Inc. – Soil Investigation Report DLNR Wailoa State Recreation Area, Hilo, Hawaii

01522_2 iii Myounghee Noh & Associates, L.L.C.

TABLE OF CONTENTS LIST OF ACRONYMS AND ABBREVIATIONS ................................................................... iv EXECUTIVE SUMMARY .......................................................................................................... v

FINDINGS .................................................................................................................................................................. V CONCLUSIONS AND RECOMMENDATIONS ................................................................................................................ VI

1.0 INTRODUCTION AND PURPOSE ............................................................................... 1 2.0 SAMPLING AND ANALYSIS ........................................................................................ 1

2.1 MULTI-INCREMENT SOIL SAMPLING ................................................................................................................ 1 2.2 PRESERVATION AND TRANSPORTATION ........................................................................................................... 2 2.3 DECONTAMINATION AND INVESTIGATION DERIVED WASTE ............................................................................ 3

3.0 ANATICAL RESULTS OF SOIL SAMPLES ............................................................... 3 3.1 LEAD IN SOIL ............................................................................................................................................... 3 3.2 ARSENIC IN SOIL ......................................................................................................................................... 4 3.3 ORGANOCHLORINE PESTICIDES IN SOIL .............................................................................................. 4

4.0 DATA QUALITY REVIEW ............................................................................................ 9 4.1 SAMPLE HOLDING TIMES ................................................................................................................................. 9 4.2 LABORATORY BLANK RESULTS ....................................................................................................................... 9 4.3 LABORATORY PERFORMANCE REVIEW ............................................................................................................ 9 4.4 FIELD PERFORMANCE REVIEW ......................................................................................................................... 9

5.0 CONCLUSIONS AND RECCOMENDATIONS......................................................... 10 6.0 LIMITATIONS ............................................................................................................... 10 REFERENCES ............................................................................................................................ 11

TABLES Table 1. Sampling and Analysis Summary ............................................................................... 2 Table 2. Summary of Soil Analytical Results ........................................................................... 5 Table 3. Data Comparison of Duplicate MIS Sample .............................................................. 9 APPENDICES Appendix A Figures Appendix B Laboratory Analytical Results CONTRIBUTORS Project Manager Phillip Cabanila Environmental Technicians Phillip Cabanila, Kristin Cabanila, Danny Falanug Report Writer Jessica Walsh Drafter Kristin Cabanila Technical Support Myounghee Noh


01522_2 iv Myounghee Noh & Associates, L.L.C.

LIST OF ACRONYMS AND ABBREVIATIONS

AVG Average

DU Decision Unit

EAL Environmental Action Level

EPA United States Environmental Protection Agency

HDOH Hawai’i Department of Health

HUD US Department of Housing and Urban Development

IDW Investigation Derived Waste

LCS Laboratory Control Sample

LCSD Laboratory Control Sample Duplicate

mg/kg Milligrams per Kilogram

MNA Myounghee Noh & Associates, L.L.C.

MS Matrix Spike

MSD Matrix Spike Duplicate

NIOSH National Institute for Occupational Safety and Health

OSHA Occupational Safety and Health Administration

PPE Personal Protective Equipment

RPD Relative Percent Difference

STDEV Standard Deviation


01522_2 v Myounghee Noh & Associates, L.L.C.

EXECUTIVE SUMMARY

This soil investigation was conducted by Myounghee Noh & Associates, L.L.C. (MNA), for Okahara and Associates, Inc., to determine the lead and arsenic content in the soil throughout the project area, and organochlorine pesticides in soil at Family Unit 3, at Wailoa State Recreation Area, located in Hilo, Hawaii.

The park’s existing walkways, paths, and structures are scheduled for renovation. The purpose of the soil investigation was to determine if levels of lead, arsenic, or organochlorine pesticides in the soil in the project area posed any potential risks to construction workers, future users, or maintenance personnel as a result of the park renovation.

During March 4 and 5, 2013, MNA collected one multi-increment sample (MIS) from the surface soil of each of the nine predetermined decision units (DU) throughout the park. A quality control sample was collected from DU 1. Each MIS sample was comprised of 75 to 100 10-gram sub-samples. The locations of the DU are described as follows:

DU 1 - the north end of the main park area, at the beginning of the walkway, and following the existing path, just south of the existing canoe shed

DU 2 - the north end of the main park area, along the water, following the existing path, west of the existing canoe shed

DU 3 - the northwest end of the main park area, along the water, following the existing path around the existing Luau pavilion

DU 4 - the area just north and east of the Comfort Station extending to existing parking lot

DU 5 - the area west of Parking Area A, extending off the existing path from the Luau Pavilion, ending at Parking Area B

DU 6 - the area west of Parking Area B, along the water, and following the existing path, ending west of Pavilion 1

DU 7 - the area west and south of Pavilion 1, beginning on the existing path and deviating slightly to the south, rejoining the existing path near the bench area

DU 8 - the area northwest of the ADA Boat Trailer Parking Lot, beginning near the bench area, and following the existing path to the parking lot

DU 9 - the area surrounding Family Unit 3, west of Parking Area A, south of the Luau Pavilion approximately 50 feet east of the water

The analytical results were compared to the Hawaii Department of Health (HDOH) Tier 1 Environmental Action Levels (EAL), and Department of Housing and Urban Development (HUD) Soil Lead Levels.

Findings

Lead in soil concentrations ranged between 29 milligrams per kilogram (mg/kg) and 160 mg/kg. None of the lead soil results exceeded the HDOH EAL (200 mg/kg) and the HUD Soil Lead Levels for play/non-play areas (400 mg/kg/1,200 mg/kg).


01522_2 vi Myounghee Noh & Associates, L.L.C.

Arsenic in soil concentrations ranged between 84 mg/kg and 380 mg/kg. All arsenic soil results exceeded the HDOH EAL (24 mg/kg). HUD does not provide guidelines for arsenic in soil.

Organochlorine pesticides were not detected in the sample collected from DU 9. Laboratory reporting limits were well below the HDOH EAL for each pesticide in this group.

Conclusions and Recommendations

Lead was present in the soil throughout the project area. Lead was measured below the HDOH EAL and HUD Soil Lead Levels for play and non-play areas in all samples collected; however, it warrants dust and runoff controls and worker protection.

Arsenic was present in soil throughout the project area in elevated levels, exceeding the HDOH EAL, 24 mg/kg.

Based on the findings of this soil investigation, MNA recommends the following:

Any work that may disturb soil containing lead and/or arsenic at Wailoa State Recreation Area should be performed in accordance with Occupational Safety and Health Administration (OSHA) requirements and in compliance with state and federal environmental regulations. This work may involve trenching or excavation of impacted soils. Applicable work practice guidelines involving soils impacted with lead or arsenic are provided in Section 5.

Okahara and Associates, Inc. – Soil Investigation Report Wailoa State Recreation Area, Hilo, Hawaii

01522_2 1 Myounghee Noh & Associates, L.L.C.

1.0 INTRODUCTION AND PURPOSE

Myounghee Noh & Associates, L.L.C. (MNA), under contract with Okahara and Associates, Inc., conducted a soil investigation for the Hawaii Department of Land and Natural Resources park improvement project, located at Wailoa State Recreation Area, Hilo, Hawaii. The purpose of the soil investigation was to identify the presence of lead, arsenic, or organochlorine pesticides, and potential risks, if any, to construction workers, future users, and maintenance personnel, as a result of planned park renovations. The location map for the project site is provided in Appendix I, Figure 1.

2.0 SAMPLING AND ANALYSIS

2.1 Multi-Increment Soil Sampling

MNA performed field work on March 4 and 5, 2013. Multi-Increment Sampling (MIS) method was used for the soil samples. MIS samples were collected from nine decision units (DU), which were comprised of the area anticipated to be disturbed as part of the planned improvement project:

DU 1 - the north end of the main park area, at the beginning of the walkway, and following the existing path, just south of the existing canoe shed

DU 2 - the north end of the main park area, along the water, following the existing path, west of the existing canoe shed

DU 3 - the northwest end of the main park area, along the water, following the existing path around the existing Luau pavilion

DU 4 - the area just north and east of the Comfort Station extending to existing parking lot

DU 5 - the area west of Parking Area A, extending off the existing path from the Luau Pavilion, ending at Parking Area B

DU 6 - the area west of Parking Area B, along the water, and following the existing path, ending west of Pavilion 1

DU 7 - the area west and south of Pavilion 1, beginning on the existing path and deviating slightly to the south, rejoining the existing path near the bench area

DU 8 - the area northwest of the ADA Boat Trailer Parking Lot, beginning near the bench area, and following the existing path to the parking lot

DU 9 - the area surrounding Family Unit 3, west of Parking Area A, south of the Luau Pavilion, approximately 50 feet east of the water

A second sample was collected from DU 1 for quality control purposes. All 10 MIS samples were analyzed for lead and arsenic by the EPA Method 7010. The MIS sample collected from DU9 was also analyzed for organochlorine pesticides by the EPA Method 8081A. A summary of the soil sampling and analyses is presented in Error! Not a valid bookmark self-reference..



Table 1. Sampling and Analysis Summary

Sample Identifier (1522W-)

Decision Unit Location

Lead (7010)

Arsenic (6010B)

Organic Pesticides(8081A)

DA1 QC DU 1

North end of the main park area, at the beginning of the walkway, and following the existing path, just south of the existing canoe shed. X X

DA2 DU 2

North end of the main park area, along the water, following the existing path, west of the existing canoe shed. X X

DA3 DU 3

Northwest end of the main park area, along the water, following the existing path around the existing Luau pavilion. X X

DA4 DU 4 Just north and east of the Comfort Station extending to existing parking lot. X X

DA5 DU 5

West of Parking Area A, extending off the existing path from the Luau Pavilion, ending at Parking Area B. X X

DA6 DU 6

West of Parking Area B, along the water, and following the existing path, ending west of Pavilion 1. X X

DA7 DU 7

West and south of Pavilion 1, beginning on existing path and deviating slightly to the south, rejoining the existing path near the bench area. X X

DA8 DU 8

North west of the ADA Boat Trailer Parking Lot, beginning near the bench area, and following the existing path to the parking lot. X X

FUD DU 9

Surrounding Family Unit 3, west of Parking Area A, south of the Luau Pavilion approximately 50 feet east of the water. X X X

Notes: All samples were preserved at 1-4°C. Each sample was a multi-incremental sampling surface soil sample, collected with a Terra Core®. Each sample was made up of 75-100 ten-gram subsamples and containerized in 16 ounce glass jars.

2.2 Preservation and Transportation

All samples were labeled and recorded in a chain-of-custody document. Samples were placed in a cooler and chilled to 1-4˚C with frozen gel ice for transport to the analytical laboratory. All composite samples were submitted to Curtis & Tompkins Analytical Laboratory, Berkeley, California.



2.3 Decontamination and Investigation Derived Waste

Decontamination needs were eliminated by using a disposable sampling tool, Terra Core® samplers. Investigation Derived Waste (IDW) was minimized through the selection of sampling techniques and the use of disposable sampling equipment. IDW included disposable personal protective equipment (PPE), and disposable sampling tools. One trash bag of PPE and disposable sampling tools were generated and disposed of in a municipal waste dumpster.

3.0 ANATICAL RESULTS OF SOIL SAMPLES

The analytical results for contaminants were compared to the HDOH Tier 1 Environmental Action Levels (EAL) of soil for unrestricted land use above a non-drinking water resource and less than 150 meters from surface water (State of Hawaii, Department of Health, 2011). Additionally, the results were compared to the Department of Housing and Urban Development (HUD) Soil Lead.

MIS soil samples were collected from the area anticipated to be disturbed by the planned improvement project. The samples were analyzed for lead and arsenic. Additionally, one of the samples was analyzed for organochlorine pesticides. A summary of the analytical results is presented in Table 2, and the complete laboratory report is provided in Appendix II.

3.1 LEAD IN SOIL

DU 1. Lead was measured at a concentration of 160 milligrams per kilogram (mg/kg) in the sample, below the HDOH EAL and the HUD Soil Lead Levels for play/non-play areas, 200 mg/kg and 400 mg/kg /1,200 mg/kg, respectively. The quality control sample collected from this DU contained 34 mg/kg lead.

DU 2. Lead was measured at a concentration of 34 mg/kg in the sample, well below the EAL and the HUD Soil Lead Levels for play/non-play areas, 200 mg/kg, and 400 mg/kg /1,200 mg/kg, respectively.

DU 3. Lead was measured at a concentration of 49 mg/kg in the sample, well below the EAL and the HUD Soil Lead Levels for play/non-play areas.


DU 5. Lead was measured at a concentration of 100 mg/kg in the sample, below the EAL and the HUD Soil Lead Levels for play/non-play areas.

DU 6. Lead was measured at a concentration of 160 mg/kg in the sample, below the EAL and the HUD Soil Lead Levels for play/non-play areas.






3.2 ARSENIC IN SOIL

DU 1. Arsenic was measured at a concentration of 130 mg/kg in the sample, exceeding the HDOH EAL, 24 mg/kg. The quality control sample (field duplicate) collected from this DU contained 190 mg/kg arsenic, also exceeding the EAL.

DU 2. Arsenic was measured at a concentration of 190 mg/kg in the sample, exceeding the EAL, 24 mg/kg.

DU 3. Arsenic was measured at a concentration of 380 mg/kg in the sample, exceeding the EAL.







HUD does not provide guidelines for arsenic in soil.

3.3 ORGANOCHLORINE PESTICIDES IN SOIL

No measurable levels of organochlorine pesticides were found in the sample collected from DU 9. Laboratory reporting limits were well below the HDOH EAL for each pesticide in this group.

Okahara & Associates, Inc. – Soil Investigation Report Wailoa State Recreation Area, Hilo, Hawaii


Table 2. Summary of Soil Analytical Results mg/kg

Analyte HDOH1

HUD Soil Level

1522W-DA1

1522W-DA2

1522W-DA3

1522W-DA4

1522W-DA5

1522W-DA6

1522W-DA7

1522W-DA8

1522W-QC

1522W-FUD

Investigation area

N/A N/A

North end of the main park area, at the beginning of the walkway, and following the existing path, just south of the existing canoe shed.

North end of the main park area, along the water, following the existing path, west of the existing canoe shed.

Northwest end of the main park area, along the water, following the existing path around the existing Luau pavilion.

Just north and east of the Comfort Station extending to existing parking lot.

West of Parking Area A, extending off the existing path from the Luau Pavilion, ending at Parking Area B.

West of Parking Area B, along the water, and following the existing path, ending west of Pavilion 1.

West and south of Pavilion 1, beginning on existing path and deviating slightly to the south, rejoining the existing path near the bench area.

North west of the ADA Boat Trailer Parking Lot, beginning near the bench area, and following the existing path to the parking lot.

North end of the main park area, at the beginning of the walkway, and following the existing path, just south of the existing canoe shed.

West of Parking Area A, south of the Luau Pavilion approximately 50 feet east of the water.

Lead 200

400/ play

1,200/ non-play

160 34 49 52 100 160 32 40 34 29

Arsenic 24 * 130 190 380 170 110 110 190 310 190 84

Aldrin 0.92 * --- --- --- --- --- --- --- --- --- ND

(<0.0086)

alpha-BHC * * --- --- --- --- --- --- --- --- --- ND

(<0.0086)

beta-BHC * * --- --- --- --- --- --- --- --- --- ND

(<0.0086)

delta-BHC * * --- --- --- --- --- --- --- --- --- ND

(<0.0086) gamma-BHC

(lindane) * * --- --- --- --- --- --- --- --- ---

ND (<0.0086)

DDD 2 * --- --- --- --- --- --- --- --- --- ND

(<0.017)

DDE 1.4 * --- --- --- --- --- --- --- --- --- ND

(<0.017)

DDT 1.7 * --- --- --- --- --- --- --- --- --- ND

(<0.017)

Okahara and Associates, Inc. – Soil Investigation Report Wailoa State Recreation Area, Hilo, Hawai’i


Analyte HDOH1

HUD Soil Level

1522W-DA1

1522W-DA2

1522W-DA3

1522W-DA4

1522W-DA5

1522W-DA6

1522W-DA7

1522W-DA8

1522W-QC

1522W-FUD

Dieldrin 1.5 * --- --- --- --- --- --- --- --- --- ND

(<0.017)

Endosulfan-1 18 * --- --- --- --- --- --- --- --- --- ND

(<0.0086)

Endosulfan-2 18 * --- --- --- --- --- --- --- --- --- ND

(<0.017) Endosulfan

sulfate * * --- --- --- --- --- --- --- --- ---

ND (<0.017)

Endrin 3.7 * --- --- --- --- --- --- --- --- --- ND

(<0.017) Endrin

aldehyde * * --- --- --- --- --- --- --- --- ---

ND (<0.017)

Heptachlor 0.11 * --- --- --- --- --- --- --- --- --- ND

(<0.0086) Heptachlor

epoxide 0.053 * --- --- --- --- --- --- --- --- ---

ND (<0.0086)

Methoxychlor 16 * --- --- --- --- --- --- --- --- --- ND

(<0.086)

Toxaphene 0.44 * --- --- --- --- --- --- --- --- --- ND

(<0.300) alpha-

Chlordane * * --- --- --- --- --- --- --- --- ---

ND (<0.0086)

gamma-Chlordane

* * --- --- --- --- --- --- --- --- --- ND

(<0.0086) Technical Chlordane

16 * --- --- --- --- --- --- --- --- --- ND

(<0.150)

Bold values: The result exceeds the HDOH Tier 1 EAL. 1 Hawaii Department of Health (HDOH) Tier 1 EAL for soil for unrestricted (residential) land use above a non-drinking water resource and less than 150 meters from surface water (Fall 2012). Laboratory reporting limits were below their respective HDOH EALs for all analytes. * - No regulatory level available (O.O) Laboratory reporting limits ---- - Not Analyzed EAL - Environmental Action Level HUD - U.S. Department of Housing and Urban Development ND - Not Detected



4.0 DATA QUALITY REVIEW

MNA conducted the analytical data quality review to determine the usability of the data generated by performing a data check for sample preservation methods, technical sample holding times, method blanks, and matrix spike/matrix spike duplicate (MS/MSD). Additionally, field performance was reviewed by comparing the analytical results of duplicate samples.

4.1 Sample Holding Times

Technical holding times for all lead, arsenic, and organochlorine pesticides analyses were met.

4.2 Laboratory Blank Results

None of the lead, arsenic, or organochlorine pesticides were found in the laboratory blank sample which indicated that the analytical processes were free of the contaminants.

4.3 Laboratory Performance Review

The MS/MSD were within the laboratory acceptable ranges. Based on this analytical data review, MNA concluded that the analytical results are considered valid and useable.

4.4 Field Performance Review

Field performance was reviewed by comparing the results of the duplicate of the MIS sample to support the reproducibility of the sampling technique and analytical practice and representativeness of the project site. Standard Deviation (STDEV), Average (AVG), and Relative Standard Deviation (RSD) between the duplicates were evaluated. An RSD of 35% or less is typically a goal during environmental investigations and considered within a reasonable range for precision and reproducibility for field sampling activities (State of Hawaii, Department of Health, Interim Final, June 21, 2009).

The RSD was calculated by using the following equations.

RSD(%) = STDEV

x 100 % AVG

One duplicate MIS sample was collected from the DU1. The data comparison between the primary and the duplicate sample is presented in Table 3. The RSD for lead on the duplicate set, 1522W-DA1 and 1522-QC, were 92 % greater than the goal. The RSD for arsenic on the du (State of Hawaii, Department of Health, Interim Final, June 21, 2009)plicate set, 1522W-DA1 and 1522-QC, were 26% within the goal. The sample result with high RSD could indicate heterogeneity in the sample matrix. Since the average level of lead in the DU is well below than the relevant HDOH Tier 1 EAL, the data was considered useable to determine potential risks due to lead impacted soil.

Table 3. Data Comparison of Duplicate MIS Sample

Analyte 1522-DA1(Primary)

1522-QC (Duplicate)

STDEVAVG

(mg/kg)RPD (%)

Lead 160 34 89 97 130

Arsenic 130 190 42 160 38



5.0 CONCLUSIONS AND RECCOMENDATIONS

MNA conducted this soil investigation to identify the presence of potentially hazardous soil contaminants, and potential risks, if any, to construction workers, future users, and maintenance personnel. For the soil investigation, MNA collected MIS surface soil samples. Ten MIS samples were collected from nine DUs and analyzed for lead and arsenic. Additionally, one sample collected from DU 9 (Family Unit 3) was analyzed for organochlorine pesticides.

The analytical results for contaminants were compared to the 2013 HDOH Tier 1 EALs of soil for unrestricted land use above a non-drinking water resource and less than 150 meters from surface water. Additionally, the results were compared to the HUD guidelines for lead in soil for play and non-play areas.

None of the soil lead results exceeded the HDOH Tier 1 EAL or the HUD Soil Lead Levels for play or non-play areas. However, all soil arsenic results exceeded the HDOH Tier 1 EAL for arsenic. HUD does not provide guidelines for arsenic in soil. None of the organochlorine pesticides were detected in the soil sample collected from DU 9.

Based on the findings of this soil investigation, MNA recommends the following:

Any work that may disturb soil containing lead and/or arsenic at Wailoa State Recreation Area must be performed in accordance with OSHA requirements and in compliance with state and federal environmental regulations. This work may involve trenching or excavation of the impacted soil. Applicable work practice guidelines involving soil impacted with lead or arsenic are summarized, but are not limited to:

Workers shall utilize appropriate personal protective equipment (PPE) and proper hygiene practices to prevent exposure to soil contaminants. This PPE may include disposable coveralls, gloves, eye protection, steel-toed safety boots, a hard hat, and a National Institute for Occupational Safety and Health (NIOSH) approved appropriate respirator and filters.

Proper equipment and dust and runoff controls must be implemented during any soil disturbance to minimize hazardous airborne dust, and to prevent the spread of contaminants and runoff.

Arsenic-impacted soil should be either properly disposed of according to applicable requirements or managed and contained through landscaping or hardscape to prevent direct contact.

Conduct a post-construction soil assessment to verify the lead and arsenic levels in all exposed surface soil.

For post-construction exposure prevention, access to the remaining impacted soil shall be restricted by hardscape or landscaping.

6.0 LIMITATIONS

The soil analyses are the top soil results which may or may not reflect the subsurface soils below the sampled depth.



REFERENCES

State of Hawaii, Department of Health. (2011, December). Screening for Environmental Hazards at Sites with Contaminated Soil and Groundwater.

State of Hawaii, Department of Health. (Interim Final, June 21, 2009). Technical Guidance Manual for the Implementation of the Hawaii State Contengency Plan.


01522_2 A Myounghee Noh & Associates, L.L.C.

APPENDIX A

Figures

Myounghee Noh &

Associates, L.L.C.

Sheet Number

A-1

Figure 1 Site Location Map

Wailoa River State Recreation Area

Hilo, Hawaii

Legend and Notes

FU - Family Unit

Island Map

Project

Site

Scale

50'

P

iilani S

treet

Kuawa Street

Manono S

treet

Wailoa Pond

FU3

Kamehameha Avenue

Wailoa River State

Recreation Area

Parking

Lot

Existing Sidewalk

Canoe

Storage

Shed

Wailoa River

Aupuni State Office

Buildings

Proposed Sidewalk

Parking

Lot

FU2

FU5

FU4

FU1

Pavilion 3

Pavilion

2

Comfort Station

Pavilion 1

Myounghee Noh &

Associates, L.L.C.

Sheet Number

A-2

Figure 2 Sample Locations and Results


Hilo Hawaii

Decision Unit 1

Scale

10'

HDOH Tier 1 EAL for unrestricted use, less than 150 meters

from surface water, and above a drinking water source.

All samples are surface soil MIS samples, collected with a

Terra Core®.

EAL - Environmental Action Level

EPA - U.S. Environmental Protection Agency

HDOH - Hawaii Department of Health

HDOH EAL for Arsenic - 24 mg/kg

HDOH EAL for Lead - 200 mg/kg

HUD - Department of Housing and Urban Development

HUD Soil Lead Level (Play areas) - 400 mg/kg

HUD Soil Lead Level (Non-play areas) - 1,200 mg/kg

mg/kg - milligrams per kilogram

QC - Quality Control Sample

Map Area

Sample ID

Lead

(mg/kg)

Arsenic

(mg/kg)

1522W-DA1 160 130

Kamehameha Avenue

Sample ID

Lead

(mg/kg)

Arsenic

(mg/kg)

1522W-QC 34 190

Legend and Notes

Decision Unit Boundary

Existing Sidewalk

DU1

Canoe

Storage

Shed

Parking

Wailoa

River

Myounghee Noh &

Associates, L.L.C.

Sheet Number

A-3



Hilo, Hawaii

Decision Unit 2

Map Area

Scale

10'




Terra Core®.










Sample ID

Lead

(mg/kg)

Arsenic

(mg/kg)

1522W-DA2 34 190

Canoe

Storage

Shed

Family Unit 5

Legend and Notes


Existing Sidewalk

DU2

Parking

Proposed Sidewalk

Wailoa

River

Myounghee Noh &

Associates, L.L.C.

Sheet Number

A-4



Hilo, Hawaii

Decision Unit 3

Scale

10'

Map Area




Terra Core®.










Sample ID

Lead

(mg/kg)

Arsenic

(mg/kg)

1522W-DA3 49 380

Pavilion 2

Kamehameha Avenue

Family Unit 5

Family Unit 4

Legend and Notes


Existing Sidewalk

DU3

Pavillion 3

Comfort Station

Parking

Wailoa

River

Myounghee Noh &

Associates, L.L.C.

Sheet Number

A-5



Hilo, Hawaii

Decision Unit 4

Scale

10'

Map Area

Sample ID

Lead

(mg/kg)

Arsenic

(mg/kg)

1522W-DA4 52 170

Pavilion 2

DU4

Pavilion 3

Comfort Station




Terra Core®.










Legend and Notes


Proposed Sidewalk

Parking

Wailoa

River

Myounghee Noh &

Associates, L.L.C.

Sheet Number

A-6



Hilo, Hawaii

Decision Unit 5

Scale

10'

Map Area

Sample ID

Lead

(mg/kg)

Arsenic

(mg/kg)

1522W-DA5 100 110

Family Unit 3

Family Unit 2

Bridge 1

Entrance

DU5




Terra Core®.










Legend and Notes


Existing Sidewalk

Parking

Proposed Sidewalk

Wailoa

River

Myounghee Noh &

Associates, L.L.C.

Sheet Number

A-7



Hilo, Hawaii

Decision Unit 6

Scale

10'

Map Area

Sample ID

Lead

(mg/kg)

Arsenic

(mg/kg)

1522W-DA6 160 110

Family Unit 1

Pavilion 1

DU6




Terra Core®.










Legend and Notes


Existing Sidewalk

Parking

Wailoa

River

Myounghee Noh &

Associates, L.L.C.

Sheet Number

A-9



Hilo, Hawaii

Decision Unit 8

Map Area

Sample ID

Lead

(mg/kg)

Arsenic

(mg/kg)

1522W-DA8 40 310

Scale

5'

Parking Lot

DU8




Terra Core®.










Legend and Notes


Existing Sidewalk

Parking

Wailoa

River

Wailoa

River

Myounghee Noh &

Associates, L.L.C.

Sheet Number

A-10



Hilo, Hawaii

Family Unit 3 Sampling for Demolition

Map AreaHDOH Tier 1 EAL for unrestricted use, less than 150 meters



Terra Core®.



FUD - Family Unit to be Demolished








ND - None Detected

Legend and Notes


Sample ID

Lead

(mg/kg)

Arsenic

(mg/kg)

Pesticides

(mg/kg)

1522W-FUD 29 84 ND

Wailoa

River

Parking

Parking Lot

Family Unit 3

12'

12'

FUD

Wailoa

River


01522_2 B Myounghee Noh & Associates, L.L.C.

APPENDIX B

Laboratory Analytical Reports

Laboratory Job Number 243617ANALYTICAL REPORT

Myounghee Noh & Associates Project : 1522_2 94 Kohola St Location : Wailua River Park Hilo, HI 96720 Level : II

Sample ID Lab ID1522W-DA1 243617-0011522W-DA2 243617-0021522W-DA3 243617-0031522W-DA4 243617-0041522W-DA5 243617-0051522W-DA6 243617-0061522W-DA7 243617-0071522W-DA8 243617-0081522W-QC 243617-0091522W-FUD 243617-010

This data package has been reviewed for technical correctness and completeness.Release of this data has been authorized by the Laboratory Manager or theManager's designee, as verified by the following signature. The resultscontained in this report meet all requirements of NELAC and pertain only tothose samples which were submitted for analysis. This report may be reproducedonly in its entirety.

Signature: Date: 03/14/2013 Isabelle ChoyProject Manager(510) 486-0900

NELAP # 01107CA

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CASE NARRATIVE

Laboratory number: 243617Client: Myounghee Noh & AssociatesProject: 1522_2Location: Wailua River ParkRequest Date: 03/07/13Samples Received: 03/07/13

This data package contains sample and QC results for ten soil samples,requested for the above referenced project on 03/07/13. The samples werereceived cold and intact. This report was revised and reissued on 3/26/2013to include Technical Chlordane per client's verbal request.

Pesticides (EPA 8081A):All samples underwent sulfur cleanup using the copper option in EPA Method3660B. All samples underwent florisil cleanup using EPA Method 3620C. 1522W-FUD (lab # 243617-010) was diluted due to the color of the sampleextract. Sample underwent Multi-Incremental Sampling (MIS). No otheranalytical problems were encountered.

Metals (EPA 6010B):All samples underwent Multi-Incremental Sampling (MIS). No analyticalproblems were encountered.

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Organochlorine Pesticides

Lab #: 243617 Location: Wailua River Park Client: Myounghee Noh & Associates Prep: EPA 3550B Project#: 1522_2 Analysis: EPA 8081A Field ID: 1522W-FUD Batch#: 196303 Lab ID: 243617-010 Sampled: 03/05/13 Matrix: Soil Received: 03/07/13 Units: ug/Kg Prepared: 03/12/13 Basis: as received Analyzed: 03/12/13 Diln Fac: 5.000

Analyte Result RL alpha-BHC ND 8.6 beta-BHC ND 8.6 gamma-BHC ND 8.6 delta-BHC ND 8.6 Heptachlor ND 8.6 Aldrin ND 8.6 Heptachlor epoxide ND 8.6 Endosulfan I ND 8.6 Dieldrin ND 17 4,4'-DDE ND 17 Endrin ND 17 Endosulfan II ND 17 Endosulfan sulfate ND 17 4,4'-DDD ND 17 Endrin aldehyde ND 17 4,4'-DDT ND 17 Chlordane (Technical) ND 150 alpha-Chlordane ND 8.6 gamma-Chlordane ND 8.6 Methoxychlor ND 86 Toxaphene ND 300

Surrogate %REC Limits TCMX 102 45-129 Decachlorobiphenyl 90 32-132

ND= Not DetectedRL= Reporting LimitPage 1 of 1 6.1

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Batch QC Report


Lab #: 243617 Location: Wailua River Park Client: Myounghee Noh & Associates Prep: EPA 3550B Project#: 1522_2 Analysis: EPA 8081A Type: BLANK Diln Fac: 1.000 Lab ID: QC679777 Batch#: 196303 Matrix: Soil Prepared: 03/12/13 Units: ug/Kg Analyzed: 03/12/13

Analyte Result RL alpha-BHC ND 1.7 beta-BHC ND 1.7 gamma-BHC ND 1.7 delta-BHC ND 1.7 Heptachlor ND 1.7 Aldrin ND 1.7 Heptachlor epoxide ND 1.7 Endosulfan I ND 1.7 Dieldrin ND 3.3 4,4'-DDE ND 3.3 Endrin ND 3.3 Endosulfan II ND 3.3 Endosulfan sulfate ND 3.3 4,4'-DDD ND 3.3 Endrin aldehyde ND 3.3 4,4'-DDT ND 3.3 Chlordane (Technical) ND 30 alpha-Chlordane ND 1.7 gamma-Chlordane ND 1.7 Methoxychlor ND 17 Toxaphene ND 60



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Batch QC Report


Lab #: 243617 Location: Wailua River Park Client: Myounghee Noh & Associates Prep: EPA 3550B Project#: 1522_2 Analysis: EPA 8081A Type: LCS Diln Fac: 1.000 Lab ID: QC679778 Batch#: 196303 Matrix: Soil Prepared: 03/12/13 Units: ug/Kg Analyzed: 03/13/13

Analyte Spiked Result %REC Limits gamma-BHC 13.38 11.52 86 49-120 Heptachlor 13.38 12.93 97 44-121 Aldrin 13.38 12.22 91 53-120 Dieldrin 26.76 23.96 90 42-141 Endrin 26.76 23.53 88 45-137 4,4'-DDT 26.76 24.89 93 37-142


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Batch QC Report


Lab #: 243617 Location: Wailua River Park Client: Myounghee Noh & Associates Prep: EPA 3550B Project#: 1522_2 Analysis: EPA 8081A Field ID: ZZZZZZZZZZ Batch#: 196303 MSS Lab ID: 243670-001 Sampled: 03/08/13 Matrix: Soil Received: 03/08/13 Units: ug/Kg Prepared: 03/12/13 Basis: as received Analyzed: 03/13/13 Diln Fac: 1.000

Type: MS Lab ID: QC679779

Analyte MSS Result Spiked Result %REC Limits gamma-BHC <0.3021 13.54 11.72 87 47-130 Heptachlor <0.2289 13.54 13.20 97 39-137 Aldrin <0.2191 13.54 12.00 89 44-140 Dieldrin <0.3675 27.07 24.11 89 45-146 Endrin <0.4218 27.07 23.57 87 45-146 4,4'-DDT <0.3246 27.07 25.70 95 30-151


Type: MSD Lab ID: QC679780

Analyte Spiked Result %REC Limits RPD Limgamma-BHC 13.39 11.56 86 47-130 0 38 Heptachlor 13.39 12.98 97 39-137 1 47 Aldrin 13.39 12.11 90 44-140 2 44 Dieldrin 26.77 24.25 91 45-146 2 37 Endrin 26.77 23.68 88 45-146 2 42 4,4'-DDT 26.77 25.40 95 30-151 0 47


RPD= Relative Percent DifferencePage 1 of 1 9.0

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Arsenic

Lab #: 243617 Location: Wailua River Park Client: Myounghee Noh & Associates Prep: EPA 3050B Project#: 1522_2 Analysis: EPA 6010B Analyte: Arsenic Batch#: 196322 Matrix: Soil Received: 03/07/13 Units: mg/Kg Prepared: 03/12/13 Basis: as received Analyzed: 03/13/13 Diln Fac: 1.000

Field ID Type Lab ID Result RL Sampled 1522W-DA1 SAMPLE 243617-001 130 0.25 03/04/13 1522W-DA2 SAMPLE 243617-002 190 0.24 03/04/13 1522W-DA3 SAMPLE 243617-003 380 0.24 03/04/13 1522W-DA4 SAMPLE 243617-004 170 0.24 03/04/13 1522W-DA5 SAMPLE 243617-005 110 0.24 03/05/13 1522W-DA6 SAMPLE 243617-006 110 0.24 03/05/13 1522W-DA7 SAMPLE 243617-007 190 0.24 03/05/13 1522W-DA8 SAMPLE 243617-008 310 0.25 03/05/13 1522W-QC SAMPLE 243617-009 190 0.25 03/04/13 1522W-FUD SAMPLE 243617-010 84 0.25 03/05/13

BLANK QC679871 ND 0.25


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Lead

Lab #: 243617 Location: Wailua River Park Client: Myounghee Noh & Associates Prep: EPA 3050B Project#: 1522_2 Analysis: EPA 6010B Analyte: Lead Batch#: 196322 Matrix: Soil Received: 03/07/13 Units: mg/Kg Prepared: 03/12/13 Basis: as received Analyzed: 03/13/13 Diln Fac: 1.000

Field ID Type Lab ID Result RL Sampled 1522W-DA1 SAMPLE 243617-001 160 0.25 03/04/13 1522W-DA2 SAMPLE 243617-002 34 0.24 03/04/13 1522W-DA3 SAMPLE 243617-003 49 0.24 03/04/13 1522W-DA4 SAMPLE 243617-004 52 0.24 03/04/13 1522W-DA5 SAMPLE 243617-005 100 0.24 03/05/13 1522W-DA6 SAMPLE 243617-006 160 0.24 03/05/13 1522W-DA7 SAMPLE 243617-007 32 0.24 03/05/13 1522W-DA8 SAMPLE 243617-008 40 0.25 03/05/13 1522W-QC SAMPLE 243617-009 34 0.25 03/04/13 1522W-FUD SAMPLE 243617-010 29 0.25 03/05/13

BLANK QC679871 ND 0.25


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Batch QC Report

Arsenic

Lab #: 243617 Location: Wailua River Park Client: Myounghee Noh & Associates Prep: EPA 3050B Project#: 1522_2 Analysis: EPA 6010B Analyte: Arsenic Diln Fac: 1.000 Field ID: 1522W-DA4 Batch#: 196322 MSS Lab ID: 243617-004 Sampled: 03/04/13 Matrix: Soil Received: 03/07/13 Units: mg/Kg Prepared: 03/12/13 Basis: as received Analyzed: 03/13/13

Type Lab ID MSS Result Spiked Result %REC Limits RPD LimBS QC679872 50.00 53.39 107 80-120 BSD QC679873 50.00 53.38 107 80-120 0 20 MS QC679874 169.9 49.21 211.6 85 71-121 MSD QC679875 49.16 205.3 72 71-121 3 34


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Batch QC Report

Lead

Lab #: 243617 Location: Wailua River Park Client: Myounghee Noh & Associates Prep: EPA 3050B Project#: 1522_2 Analysis: EPA 6010B Analyte: Lead Diln Fac: 1.000 Field ID: 1522W-DA4 Batch#: 196322 MSS Lab ID: 243617-004 Sampled: 03/04/13 Matrix: Soil Received: 03/07/13 Units: mg/Kg Prepared: 03/12/13 Basis: as received Analyzed: 03/13/13

Type Lab ID MSS Result Spiked Result %REC Limits RPD LimBS QC679872 100.0 102.4 102 80-120 BSD QC679873 100.0 102.4 102 80-120 0 22 MS QC679874 52.16 98.43 111.5 60 52-120 MSD QC679875 98.33 110.5 59 52-120 1 51


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