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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)
DateComparison
Value
ppbSource
TCE10.3 (1)19893.9 (6)March
1993
3CREG
PCE1.6 (1)1989ND (6)March
1993
0.7CREG
benzene0.4 (1)1990ND (6)March
1993
1CREG
1,1-DCEND (2)(17)1989
1992
1993
ND (6)March
1993
0.06CREG
1,1-DCAND (2)(17)1989
1992
1993
ND (6)March
1993
none
CCL4ND (2)(17)1989
1992
1993
ND (6)March
1993
0.3CREG




Table 1B.

Groundwater--Public Well 60-1
ContaminantMaximum
Concentration
ppb
(reference)
DateLatest
Concentration
ppb
(reference)
DateComparison
Value
ppbSource
TCE15.5 (17)1992ND (6)March
1993
3CREG
PCEND (2)(17)1989
1992
1993
ND (6)March
1993
0.7CREG
benzeneND (2)(17)1989
1992
1993
ND (6)March
1993
1CREG
1,1-DCEND (2)(17)1989
1992
1993
ND (6)March
1993
0.06CREG
1,1-DCAND (2)(17)1989
1992
1993
ND (6)March
1993
none
CCL4ND (2)(17)1989
1992
1993
ND (6)March
1993
0.3CREG




Table 1C.

Groundwater--Public Well 63-1
ContaminantMaximum
Concentration
ppb
(reference)
DateLatest
Concentration
ppb
(reference)
DateComparison
Value
ppbSource
TCEND (1)(2)1989
1990
1991
1992
ND (6)March
1993
3CREG
PCEND (2)1989ND (6)March
1993
0.7CREG
benzeneND (2)1989ND (6)March
1993
1CREG
1,1-DCEND (2)1989ND (6)March
1993
0.06CREG
1,1-DCAND (2)1989ND (6)March
1993
none
CCL4ND (2)1989ND (6)March
1993
0.3CREG




Table 1D.

Groundwater--Public Well 64-1
ContaminantMaximum
Concentration
ppb
(reference)
DateLatest
Concentration
ppb
(reference)
DateComparison
Value
ppbSource
TCE220 (6)March
1993
220 (6)March
1993
3CREG
PCEND (2)(17)1989
1992
1993
ND (6)March
1993
0.7CREG
benzeneND (2)(17)1989
1992
1993
ND (6)March
1993
1CREG
1,1-DCE2.3 (17)1993ND (6)March
1993
0.06CREG
1,1-DCA0.9 (17)1993ND (6)March
1993
none
CCL4ND (2)(17)1989
1992
1993
ND (6)March
1993
0.3CREG




Table 1E.

Groundwater--Public Well 64-2
ContaminantMaximum
Concentration
ppb
(reference)
DateLatest
Concentration
ppb
(reference)
DateComparison
Value
ppbSource
TCE65.1 (1)1990ND (6)March
1993
3CREG
PCE2.4 (1)1989ND (6)March
1993
0.7CREG
benzeneND (2)(17)1989
1992
1993
ND (6)March
1993
1CREG
1,1-DCE0.7 (2)1989ND (6)March
1993
0.06CREG
1,1-DCAND (2)(17)1989
1992
1993
ND (6)March
1993
none
CCL4ND (2)(17)1989
1992
1993
ND (6)March
1993
0.3CREG




Table 1F.

Groundwater--Public Well 74-1
ContaminantMaximum
Concentration
ppb
(reference)
DateLatest
Concentration
ppb
(reference)
DateComparison
Value
ppbSource
TCE12.6 (17)1992ND (6)March
1993
3CREG
PCEND (2)(17)1989
1992
1993
ND (6)March
1993
0.7CREG
benzeneND (2)(17)1989
1992
1993
ND (6)March
1993
1CREG
1,1-DCEND (2)(17)1989
1992
1993
ND (6)March
1993
0.06CREG
1,1-DCAND (2)(17)1989
1992
1993
ND (6)March
1993
none
CCL4ND (2)(17)1989
1992
1993
ND (6)March
1993
0.3CREG




Table 2.

Groundwater--Eight Public Water System Distribution Samples (Tap Samples)
ContaminantMaximum
Concentration
ppb
(reference)
DateComparison
Value
ppbSource
TCE14.0* (2)(6)1989
1993
3CREG
PCE1.6* (2)(6)1989
1993
0.7CREG
benzeneND (2)(6)1989
1993
1CREG
1,1-DCEND (2)(6)1989
1993
0.06CREG
1,1-DCAND (2)(6)1989
1993
none
CCL4ND (2)(6)1989
1993
0.3CREG
* Note: TCE detected in 3 of 8 samples;
PCE detected in 1 of 8 samples.




Table 3.

Groundwater--Sixteen Private Water Supply Wells
ContaminantMaximum
Concentration
ppb
(reference)
DateComparison
Value
ppbSource
TCE2.9* (1)(2)19903CREG
PCEND (1)(2)19900.7CREG
benzeneND (1)(2)19901CREG
1,1-DCEND (1)(2)19900.06CREG
1,1-DCAND (1)(2)1990none
CCL4ND (1)(2)19900.3CREG
* Note: TCE detected in 3 of 16 wells.




Table 4.

Groundwater--Monitoring Wells
ContaminantMaximum
Concentration
ppb
(reference)
DateWell Designation;
Approximate Location
Comparison
Value
ppbSource
TCE470 (8)1992MW-7B; Near West 1st &West D Streets (a block fromOgallala Electronics)3CREG
PCE395.1 (1)1991NW-3A; Near East 4th andEast B Streets0.7CREG
benzene471 (9)1989MW-11; Near East 1st andEast F Streets (nearBosselman's)1CREG
2,632 (9)1991MW-3 (at Bosselman's
1,1-DCE19.5 (1)1992NW-1; Near Railroad andWest A Streets0.06CREG
1,1-DCA13.4 (1)1992NW-1; Near Railroad andWest A Streetsnone
CCL432.4 (1)1992NW-2; Near Railroad andEast A Streets0.3CREG




Table 5.

Soil Gas--Maximum Concentrations Recorded Anywhere
ContaminantMaximum
Concentration
ppb
Approximate LocationComparison
Value
ppbSource
TCE>22,000 (13)Near West O Street (at ASCproperty)0.6CREG
PCE>11,000 (13)Near West O Street (at ASCproperty)2CREG
1,1-DCE>66,000 (13)Near West O Street (at ASCproperty)0.02CREG
1,2-DCE41,800 (13)Near West O Street (at ASCproperty)none
1,4-DCB1,080 (13)Near West O Street (at ASCproperty)none
1,1,1-TCA>13,000 (13)Near West O Street(at ASC property)300Acute
EMEG
ethyl-
benzene
16,300 (13)West 1st Street
(at Bosselman's)
none
xylene72,000 (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
ASCBosselmanGoodallHelmuth ppbSource
TCE>22,0003022B1410.6CREG
PCE>11,000332B3732CREG
1,1-DCE>66,0006,510NDND0.02CREG
1,2-DCE41,800479ND34none
1,4-DCB1,080NDNDNDnone
1,1,1-TCA>13,00072812B300Acute
EMEG
ethyl-
benzene
ND16,300NDNDnone
xyleneND72,300NDNDnone
B--analyte also found in equipment blank
Sampling conducted in 1990
Ref (13)



Table 6B.

Soil Gas--near Specific Identified Businesses
ContaminantMaximum Concentration (ppb)Comparison
Value
J&K
Station
Keith
County
Ogallala
Electronics
Ogallala
Dump
ppbSource
TCE239ND1,630 1560.6CREG
PCE59ND27 312CREG
1,1-DCE413ND315ND0.02CREG
1,2-DCENDND159 NDnone
1,4-DCBNDNDNDNDnone
1,1,1-TCA8420>11,000 2B300Acute
EMEG
ethyl-
benzene
NDND61 NDnone
xyleneNDND1,210 NDnone
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 TopTRW/
Goodall
Quick Electricppb Source
TCE 61NIND0.6CREG
PCE >7,600NI2B2CREG
1,1-DCE NDNIND0.02CREG
1,2-DCE NDNINDnone
1,4-DCB NDNINDnone
1,1,1-TCA159NI3B300Acute
EMEG
ethyl-
benzene
NDNINDnone
xyleneNDNINDnone
B--analyte also found in equipment blank
NI--no information
Sampling conducted in 1990
Ref (13)



Table 7.

Exposure Pathways
PATHWAY NAMEEXPOSURE PATHWAY ELEMENTSTIME
SOURCE MEDIUMPOINT OF
EXPOSURE
ROUTE OF
EXPOSURE
EXPOSED
POPULATION
Principal Completed Pathways


Public and privatewater wellsNot determinedGroundwaterResidencesBusinesses
Public
buildings
Ingestion
Inhalation
Skin Contact
Residents
Workers
Visitors
Past
Present
Future
Other Completed Pathways



Workplace
interior air
WorkplacereleasesAirBusinesses
using solvents
InhalationWorkersPast
Present
Future
Principal Potential Pathways



Soil gas/
interior air
Not determinedAirBuildingsInhalationBuilding
occupants
Past
Present
Future
Other Potential Pathways



SoilsWorkplacereleasesSoilChemical
release points
Ingestion
Inhalation
Skin Contact
WorkersPastPresent
Future




Table 8.

Estimated Populations for Completed and Potential Exposure Pathways
Estimated Exposed and Potentially ExposedPopulationsContaminants and Media:
DescriptionNumberTCEPCEBenzene1,1-DCE
Area residents, workers, visitorsunknowngroundwatergroundwatergroundwatergroundwater
Workers in businesses using solventsunknownairairair?air?
Area building occupantsunknownair?air?
air?
Workers (excavation, etc.)unknownsoil?soil?soil?soil?


Estimated Exposed and Potentially ExposedPopulationsContaminants and Media:
DescriptionNumber1,1-DCACCL41,2-DCE1,4-DCB
Area residents, workers, visitorsunknowngroundwatergroundwater

Workers in businesses using solventsunknownair?air?

Area building occupantsunknown

air?air?
Workers (excavation, etc.)unknownsoil?soil?soil?soil?


Table continued




Table 8.

(Continued) Estimated Populations for Completed and Potential Exposure Pathways
Estimated Exposed and Potentially ExposedPopulationsContaminants and Media:
DescriptionNumber1,1,1-TCAEthylbenzeneXylene
Area residents, workers, visitorsunknown


Workers in businesses using solventsunknown


Area building occupantsunknownair?air?air?
Workers (excavation, etc.)unknownsoil?soil?soil?

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


APPENDIX C -- HEALTH GUIDELINES

LIST OF TABLES

Table
Number
Title
9Comparison of Estimated Exposed Dose to Health Guidelines for Users ofPrivate/Residential Wells
10Comparison 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
ContaminantExposure
Pathway
Health Guideline for Ingestion - mg/kg/day
ValueSourceExceeded by
Estimated Exposure
Dose
Benzene PW 39-1NoneNoneNone
1,1-DCAPW 64-1NoneNone None
1,1-DCEPW 64-10.009MRL/RFDNo
1,1-DCEPW 64-20.009MRL/RfDNo
PCEPW 39-10.1/0.01Inter.MRL/RfDNo
PCEPW 64-20.1/0.01Inter.MRL/RfDNo
PCETap Water0.1/0.01Inter.MRL/RfDNo
TCEPW 39-10.7Inter.MRLNo
TCEPW 39-20.7Inter.MRLNo
TCEPW 60-10.7Inter.MRLNo
TCEPW 64-10.7Inter.MRLNo
TCEPW 64-20.7Inter.MRLNo
TCEPW 74-10.7Inter.MRLNo
TCETap Water0.7Inter.MRLNo
TCERW0.7Inter.MRLNo




Table 10.

Comparison of Estimated Exposed Dose to Health Guidelines for Future Groundwater Users
ContaminantExposurePathwayHealth Guideline for Ingestion - mg/kg/day
ValueSourceExceeded by
Estimated Exposure
Dose
BenzeneMW Near West1st & D Streets(NearBosselman's) NoneNoneNone
BenzeneMW atBosselman's NoneNoneNone
CarbontetrachlorideMW nearRailroad & East AStreets0.0007RfDChild only
1,1-DCAMW Near Railroad & WestA StreetsNoneNoneNone
1,1-DCEMW NearRailroad & WestA Streets0.009MRL/RfDNo
PCEMW Near 4th &B Streets.0.1/0.01Inter.MRL/RfDNo
TCEMW NearOgallalaElectronics0.7Inter.MRLNo


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