PUBLIC HEALTH ASSESSMENT

AMERICAN SHIZUKI CORPORATION/
OGALLALA ELECTRONICS AND MANUFACTURING
OGALLALA, KEITH COUNTY, NEBRASKA

APPENDIX A -- SITE MAPS

LIST OF FIGURES

Figure Number	Title

1 Central City Area
2 Locations of Facilities and Public Wells in Central City Area

Figure 1. Central City Area

Figure 2. Locations of Facilities and Public Wells in Central City Area

APPENDIX B -- CONTAMINANT AND PATHWAY TABLES

LIST OF TABLES

Table Number	Title

1A Groundwater--Public Well 39-1
1B Groundwater--Public Well 60-1
1C Groundwater--Public Well 63-1
1D Groundwater--Public Well 64-1
1E Groundwater--Public Well 64-2
1F Groundwater--Public Well 74-1
2 Groundwater--Eight Public Water System Distribution Samples (Tap Samples)
3 Groundwater--Sixteen Private Water Supply Wells
4 Groundwater--Monitoring Wells
5 Soil Gas--Maximum Concentrations Recorded Anywhere
6A Soil Gas--near Specific Identified Businesses
6B Soil Gas--near Specific Identified Businesses
6C Soil Gas--near Specific Identified Businesses
7 Exposure Pathways
8 Estimated Populations for Completed and Potential Exposure Pathways

LIST OF ACRONYMS, CODES, AND ABBREVIATIONS

ATSDR	Agency for Toxic Substances and Disease Registry
CCL4	Carbon tetrachloride
1,1-DCA	1,1-Dichloroethane
1,4-DCB	1,4-Dichlorobenzene
1,1-DCE	1,1-Dichloroethylene
1,2-DCE	1,2-Dichloroethylene
PCE	Tetrachloroethylene
1,1,1-TCA	1,1,1,-Trichloroethane
TCE	Trichloroethylene
CREG	Cancer risk evaluation guide
EMEG	Environmental media evaluation guide
ppb	parts per billion
ppm	parts per million
B	indicates possible/probable blank contamination
ND	not detected
>	greater than

Table 1A.

Groundwater--Public Well 39-1

Contaminant	Maximum Concentration ppb (reference)	Date	Latest Concentration ppb (reference)	Date	Comparison Value
					ppb	Source
TCE	10.3 (1)	1989	3.9 (6)	March 1993	3	CREG
PCE	1.6 (1)	1989	ND (6)	March 1993	0.7	CREG
benzene	0.4 (1)	1990	ND (6)	March 1993	1	CREG
1,1-DCE	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	0.06	CREG
1,1-DCA	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	none
CCL4	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	0.3	CREG

Table 1B.

Groundwater--Public Well 60-1

Contaminant	Maximum Concentration ppb (reference)	Date	Latest Concentration ppb (reference)	Date	Comparison Value
					ppb	Source
TCE	15.5 (17)	1992	ND (6)	March 1993	3	CREG
PCE	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	0.7	CREG
benzene	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	1	CREG
1,1-DCE	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	0.06	CREG
1,1-DCA	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	none
CCL4	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	0.3	CREG

Table 1C.

Groundwater--Public Well 63-1

Contaminant	Maximum Concentration ppb (reference)	Date	Latest Concentration ppb (reference)	Date	Comparison Value
					ppb	Source
TCE	ND (1)(2)	1989 1990 1991 1992	ND (6)	March 1993	3	CREG
PCE	ND (2)	1989	ND (6)	March 1993	0.7	CREG
benzene	ND (2)	1989	ND (6)	March 1993	1	CREG
1,1-DCE	ND (2)	1989	ND (6)	March 1993	0.06	CREG
1,1-DCA	ND (2)	1989	ND (6)	March 1993	none
CCL4	ND (2)	1989	ND (6)	March 1993	0.3	CREG

Table 1D.

Groundwater--Public Well 64-1

Contaminant	Maximum Concentration ppb (reference)	Date	Latest Concentration ppb (reference)	Date	Comparison Value
					ppb	Source
TCE	220 (6)	March 1993	220 (6)	March 1993	3	CREG
PCE	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	0.7	CREG
benzene	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	1	CREG
1,1-DCE	2.3 (17)	1993	ND (6)	March 1993	0.06	CREG
1,1-DCA	0.9 (17)	1993	ND (6)	March 1993	none
CCL4	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	0.3	CREG

Table 1E.

Groundwater--Public Well 64-2

Contaminant	Maximum Concentration ppb (reference)	Date	Latest Concentration ppb (reference)	Date	Comparison Value
					ppb	Source
TCE	65.1 (1)	1990	ND (6)	March 1993	3	CREG
PCE	2.4 (1)	1989	ND (6)	March 1993	0.7	CREG
benzene	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	1	CREG
1,1-DCE	0.7 (2)	1989	ND (6)	March 1993	0.06	CREG
1,1-DCA	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	none
CCL4	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	0.3	CREG

Table 1F.

Groundwater--Public Well 74-1

Contaminant	Maximum Concentration ppb (reference)	Date	Latest Concentration ppb (reference)	Date	Comparison Value
					ppb	Source
TCE	12.6 (17)	1992	ND (6)	March 1993	3	CREG
PCE	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	0.7	CREG
benzene	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	1	CREG
1,1-DCE	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	0.06	CREG
1,1-DCA	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	none
CCL4	ND (2)(17)	1989 1992 1993	ND (6)	March 1993	0.3	CREG

Table 2.

Groundwater--Eight Public Water System Distribution Samples (Tap Samples)

Contaminant	Maximum Concentration ppb (reference)	Date	Comparison Value
			ppb	Source
TCE	14.0* (2)(6)	1989 1993	3	CREG
PCE	1.6* (2)(6)	1989 1993	0.7	CREG
benzene	ND (2)(6)	1989 1993	1	CREG
1,1-DCE	ND (2)(6)	1989 1993	0.06	CREG
1,1-DCA	ND (2)(6)	1989 1993	none
CCL4	ND (2)(6)	1989 1993	0.3	CREG
* Note: TCE detected in 3 of 8 samples; PCE detected in 1 of 8 samples.

Table 3.

Groundwater--Sixteen Private Water Supply Wells

Contaminant	Maximum Concentration ppb (reference)	Date	Comparison Value
			ppb	Source
TCE	2.9* (1)(2)	1990	3	CREG
PCE	ND (1)(2)	1990	0.7	CREG
benzene	ND (1)(2)	1990	1	CREG
1,1-DCE	ND (1)(2)	1990	0.06	CREG
1,1-DCA	ND (1)(2)	1990	none
CCL4	ND (1)(2)	1990	0.3	CREG
* Note: TCE detected in 3 of 16 wells.

Table 4.

Groundwater--Monitoring Wells

Contaminant	Maximum Concentration ppb (reference)	Date	Well Designation; Approximate Location	Comparison Value
				ppb	Source
TCE	470 (8)	1992	MW-7B; Near West 1st &West D Streets (a block fromOgallala Electronics)	3	CREG
PCE	395.1 (1)	1991	NW-3A; Near East 4th andEast B Streets	0.7	CREG
benzene	471 (9)	1989	MW-11; Near East 1st andEast F Streets (nearBosselman's)	1	CREG
	2,632 (9)	1991	MW-3 (at Bosselman's
1,1-DCE	19.5 (1)	1992	NW-1; Near Railroad andWest A Streets	0.06	CREG
1,1-DCA	13.4 (1)	1992	NW-1; Near Railroad andWest A Streets	none
CCL4	32.4 (1)	1992	NW-2; Near Railroad andEast A Streets	0.3	CREG

Table 5.

Soil Gas--Maximum Concentrations Recorded Anywhere

Contaminant	Maximum Concentration ppb	Approximate Location	Comparison Value
			ppb	Source
TCE	>22,000 (13)	Near West O Street (at ASCproperty)	0.6	CREG
PCE	>11,000 (13)	Near West O Street (at ASCproperty)	2	CREG
1,1-DCE	>66,000 (13)	Near West O Street (at ASCproperty)	0.02	CREG
1,2-DCE	41,800 (13)	Near West O Street (at ASCproperty)	none
1,4-DCB	1,080 (13)	Near West O Street (at ASCproperty)	none
1,1,1-TCA	>13,000 (13)	Near West O Street(at ASC property)	300	Acute EMEG
ethyl- benzene	16,300 (13)	West 1st Street (at Bosselman's)	none
xylene	72,000 (13)	West 1st Street (at Bosselman)	none
Sampling conducted in 1990

Table 6A.

Soil Gas--near Specific Identified Businesses

Contaminant	Maximum Concentration (ppb)				Comparison Value
	ASC	Bosselman	Goodall	Helmuth	ppb	Source
TCE	>22,000	302	2B	141	0.6	CREG
PCE	>11,000	33	2B	373	2	CREG
1,1-DCE	>66,000	6,510	ND	ND	0.02	CREG
1,2-DCE	41,800	479	ND	34	none
1,4-DCB	1,080	ND	ND	ND	none
1,1,1-TCA	>13,000	72	81	2B	300	Acute EMEG
ethyl- benzene	ND	16,300	ND	ND	none
xylene	ND	72,300	ND	ND	none
B--analyte also found in equipment blank Sampling conducted in 1990

Ref (13)

Table 6B.

Soil Gas--near Specific Identified Businesses

Contaminant	Maximum Concentration (ppb)				Comparison Value
	J&K Station	Keith County	Ogallala Electronics	Ogallala Dump	ppb	Source
TCE	239	ND	1,630	156	0.6	CREG
PCE	59	ND	27	31	2	CREG
1,1-DCE	413	ND	315	ND	0.02	CREG
1,2-DCE	ND	ND	159	ND	none
1,4-DCB	ND	ND	ND	ND	none
1,1,1-TCA	84	20	>11,000	2B	300	Acute EMEG
ethyl- benzene	ND	ND	61	ND	none
xylene	ND	ND	1,210	ND	none
B--analyte also found in equipment blank Sampling conducted in 1990

Ref (13)

Table 6C.

Soil Gas--near Specific Identified Businesses

	Maximum Concentration (ppb)			Comparison Value
Contaminant	Tip Top	TRW/ Goodall	Quick Electric	ppb	Source
TCE	61	NI	ND	0.6	CREG
PCE	>7,600	NI	2B	2	CREG
1,1-DCE	ND	NI	ND	0.02	CREG
1,2-DCE	ND	NI	ND	none
1,4-DCB	ND	NI	ND	none
1,1,1-TCA	159	NI	3B	300	Acute EMEG
ethyl- benzene	ND	NI	ND	none
xylene	ND	NI	ND	none
B--analyte also found in equipment blank NI--no information Sampling conducted in 1990

Ref (13)

Table 7.

Exposure Pathways

PATHWAY NAME	EXPOSURE PATHWAY ELEMENTS					TIME
	SOURCE	MEDIUM	POINT OF EXPOSURE	ROUTE OF EXPOSURE	EXPOSED POPULATION
Principal Completed Pathways
Public and privatewater wells	Not determined	Groundwater	ResidencesBusinesses Public buildings	Ingestion Inhalation Skin Contact	Residents Workers Visitors	Past Present Future
Other Completed Pathways
Workplace interior air	Workplacereleases	Air	Businesses using solvents	Inhalation	Workers	Past Present Future
Principal Potential Pathways
Soil gas/ interior air	Not determined	Air	Buildings	Inhalation	Building occupants	Past Present Future
Other Potential Pathways
Soils	Workplacereleases	Soil	Chemical release points	Ingestion Inhalation Skin Contact	Workers	PastPresent Future

Table 8.

Estimated Populations for Completed and Potential Exposure Pathways

Estimated Exposed and Potentially ExposedPopulations		Contaminants and Media:
Description	Number	TCE	PCE	Benzene	1,1-DCE
Area residents, workers, visitors	unknown	groundwater	groundwater	groundwater	groundwater
Workers in businesses using solvents	unknown	air	air	air?	air?
Area building occupants	unknown	air?	air?		air?
Workers (excavation, etc.)	unknown	soil?	soil?	soil?	soil?

Estimated Exposed and Potentially ExposedPopulations		Contaminants and Media:
Description	Number	1,1-DCA	CCL4	1,2-DCE	1,4-DCB
Area residents, workers, visitors	unknown	groundwater	groundwater
Workers in businesses using solvents	unknown	air?	air?
Area building occupants	unknown			air?	air?
Workers (excavation, etc.)	unknown	soil?	soil?	soil?	soil?

Table continued

Table 8.

(Continued) Estimated Populations for Completed and Potential Exposure Pathways

Estimated Exposed and Potentially ExposedPopulations		Contaminants and Media:
Description	Number	1,1,1-TCA	Ethylbenzene	Xylene
Area residents, workers, visitors	unknown
Workers in businesses using solvents	unknown
Area building occupants	unknown	air?	air?	air?
Workers (excavation, etc.)	unknown	soil?	soil?	soil?

?--Indicates uncertainty whether contaminant is actually present in the medium specified.

APPENDIX C -- HEALTH GUIDELINES

LIST OF TABLES

Table Number	Title

9	Comparison of Estimated Exposed Dose to Health Guidelines for Users ofPrivate/Residential Wells
10	Comparison of Estimated Exposed Dose to Health Guidelines for Users ofPrivate/Residential Wells

Table 9.

Comparison of Estimated Exposed Dose to Health Guidelines for Users of Public/ Private Residential Wells

Contaminant	Exposure Pathway	Health Guideline for Ingestion - mg/kg/day
		Value	Source	Exceeded by Estimated Exposure Dose
Benzene	PW 39-1	None	None	None
1,1-DCA	PW 64-1	None	None	None
1,1-DCE	PW 64-1	0.009	MRL/RFD	No
1,1-DCE	PW 64-2	0.009	MRL/RfD	No
PCE	PW 39-1	0.1/0.01	Inter.MRL/RfD	No
PCE	PW 64-2	0.1/0.01	Inter.MRL/RfD	No
PCE	Tap Water	0.1/0.01	Inter.MRL/RfD	No
TCE	PW 39-1	0.7	Inter.MRL	No
TCE	PW 39-2	0.7	Inter.MRL	No
TCE	PW 60-1	0.7	Inter.MRL	No
TCE	PW 64-1	0.7	Inter.MRL	No
TCE	PW 64-2	0.7	Inter.MRL	No
TCE	PW 74-1	0.7	Inter.MRL	No
TCE	Tap Water	0.7	Inter.MRL	No
TCE	RW	0.7	Inter.MRL	No

Table 10.

Comparison of Estimated Exposed Dose to Health Guidelines for Future Groundwater Users

Contaminant	ExposurePathway	Health Guideline for Ingestion - mg/kg/day
		Value	Source	Exceeded by Estimated Exposure Dose
Benzene	MW Near West1st & D Streets(NearBosselman's)	None	None	None
Benzene	MW atBosselman's	None	None	None
Carbontetrachloride	MW nearRailroad & East AStreets	0.0007	RfD	Child only
1,1-DCA	MW Near Railroad & WestA Streets	None	None	None
1,1-DCE	MW NearRailroad & WestA Streets	0.009	MRL/RfD	No
PCE	MW Near 4th &B Streets.	0.1/0.01	Inter.MRL/RfD	No
TCE	MW NearOgallalaElectronics	0.7	Inter.MRL	No

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