ATSDR - PHA - UGI Columbia Gas Plant, Columbia, Lancaster County, Pennsylvania

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PUBLIC HEALTH ASSESSMENT

UGI COLUMBIA GAS PLANT
COLUMBIA, LANCASTER COUNTY, PENNSYLVANIA

APPENDIX A. Figures

APPENDIX B. Tables

Table 1. Relief Holder Pit Contaminant Concentrations (1, 21)

Contaminant Location Maximum Concentration
mg/kg (solid) Comparison Value

mg/kg Source

arsenic relief holder ND 0.4 CREG

benzene relief holder 320 20 CREG

B[a]P relief holder ND 0.1 CREG

ethylbenzene relief holder 1,200 5,000^a RMEG

naphthalene relief holder 1,320 NA -

toluene relief holder 920 10,000^a RMEG

a - Child.
mg/kg - Milligrams Per Kilogram.
NA - Not Available
ND - Not Detected
NT - Not Tested.
CREG - Cancer Risk Evaluation Guide.
RMEG - Reference Dose Media Evaluation Guide.

Table 2. Maximum Demonstration Well Contaminant Concentrations (4, 21)

Contaminant Location Maximum Concentration
µg/L (liquid) Comparison Value

µg/L Source

arsenic relief holder 270.0 0.02 CREG

benzene relief holder 8,100 1 CREG

B[a]P relief holder 530 0.005 CREG

ethylbenzene relief holder 3,800 1,000^a RMEG

naphthalene relief holder 25,000 20 LTHA

toluene relief holder 7,900 2,000^a RMEG

a - Child.
µg/L - Micrograms Per Liter.
CREG - Cancer Risk Evaluation Guide.
LTHA - Lifetime Health Advisory
RMEG - Reference Dose Media Evaluation Guide.

Table 3. Maximum On-Site Soil Contaminant Concentrations (4)

Contaminant Location Maximum Concentration
mg/kg Comparison Value

mg/kg Source

arsenic Subsoil 4 11.8 0.4 CREG

benzene Subsoil 4 0.094 20 CREG

B[a]P Subsoil 4 19 0.1 CREG

ethylbenzene Subsoil 4 0.12 5,000^a RMEG

naphthalene Subsoil 4 13 NA -

toluene Subsoil 4 0.022 10,000^a RMEG

a - Child.
mg/kg - Milligrams Per Kilogram.
NA - Not Available
CREG - Cancer Risk Evaluation Guide.
RMEG - Reference Dose Media Evaluation Guide.

Table 4. Maximum On-site Groundwater Contaminant Concentrations (1, 4, 21)

Contaminant Location Maximum Concentration
µg/L Comparison Value

µg/L Source

arsenic MW3S,MW3D 2 0.02 CREG

benzene MW3S 310,000 1 CREG

B[a]P MW3S 150 0.005 CREG

ethylbenzene MW3S 60,000 1,000^a RMEG

naphthalene MW3S 7,600 20 LTHA

toluene MW3S 190,000 2,000^a RMEG

a - Child.
µg/L - Micrograms Per Liter.
ND - Not Detected.
CREG - Cancer Risk Evaluation Guide.
LTHA - Lifetime Health Advisory.
RMEG - Reference Dose Media Evaluation Guide.

Table 5. Maximum Off-site Soil Contaminant Concentrations (4)

Contaminant Location Maximum Concentration
mg/kg Comparison Value

mg/kg Source

arsenic S9 12.9 0.4 CREG

benzene All ND 20 CREG

B[a]P Subsoil 2 350 0.1 CREG

ethylbenzene All ND 5,000^a RMEG

naphthalene Subsoil 2 73 NA -

toluene All ND 10,000^a RMEG

a - Child.
mg/kg - Milligrams Per Kilogram
NA - Not Available
ND - Not Detected
CREG - Cancer Risk Evaluation Guide.
RMEG - Reference Dose Media Evaluation Guide.

Table 6. Maximum Off-Site Groundwater Contaminant Concentrations (1, 4)

Contaminant Location Maximum Concentration
µg/L Comparison Value

µg/L Source

arsenic MW5 16.4 0.02 CREG

benzene MW6D 14,000 1 CREG

B[a]P MW6S, MW6D ND 0.005 CREG

ethylbenzene MW6D 1,600 1,000^a RMEG

naphthalene MW6D 5,650 20 LTHA

toluene MW6D 2,100 2,000^a RMEG

a - Child.
µg/L - Micrograms Per Liter
ND - Not Detected.
CREG - Cancer Risk Evaluation Guide.
LTHA - Lifetime Health Advisory.
RMEG - Reference Dose Media Evaluation Guide.

Table 7. Maximum Sediment Contaminant Concentrations (1, 4)

Contaminant Location Maximum Concentration
mg/kg Comparison Value

mg/kg Source

arsenic SD4 10 0.4 CREG

benzene SD1,2,3,4 ND 20 CREG

B[a]P SS2 8.3 0.1 CREG

ethylbenzene SD1,2,3,4 ND 5,000^a RMEG

naphthalene SS2 12 NA -

toluene SD1,2,3,4 ND 10,000^a RMEG

a - Child.
mg/kg - Milligrams Per Kilogram.
NA - Not Available
ND - Not Detected
CREG - Cancer Risk Evaluation Guide.
RMEG - Reference Dose Media Evaluation Guide.

Table 8. Maximum Surface Water Contaminant Concentrations (1, 4)

Contaminant Location Maximum Concentration
µg/L Comparison Value

µg/L Source

arsenic SW1,2,3,4,5 ND 0.02 CREG

benzene SW3 20 1 CREG

B[a]P SW1,2,3,4,5 ND 0.005 CREG

ethylbenzene SW3 6 1,000^a RMEG

naphthalene SW1,2,3,4,5 ND 20 LTHA

toluene SW3 4 2,000^a RMEG

a - Child.
µg/L - Micrograms Per Liter
ND - Not Detected
CREG - Cancer Risk Evaluation Guide.
LTHA - Lifetime Health Advisory
RMEG - Reference Dose Media Evaluation Guide.

Table 9. Completed Exposure Pathways

Pathway Name Exposure Pathway Elements Time

Source Environmental Medium Point of Exposure Route of Exposure Exposed Population

tunnel tars UGI direct contact on site dermal, inhalation employee past

tunnel tars UGI air on site inhalation employees past

purifier chips UGI air on site inhalation employees past

Table 10. Estimated Population Potentially Affected By Completed Exposure Pathway

Potentially Exposed Populations Affected by a Completed Pathway

Location Estimated Number Pathway Type Contaminants in the Pathway

on site 1 direct contact coal tar

on site tunnel tars and purifier chips fewer than 50 air coal tar-related volatiles

Table 11. Potential Exposure Pathways

Pathway Name Exposure Pathway Elements Time Missing Pathway Component

Source Environmental Media Point of Exposure Route of Exposure Exposed Population

groundwater UGI groundwater cottages dermal, ingestion, inhalation cottage residents future point of exposure

sediment UGI sediment river dermal, ingestion, river users past, present, future exposed population

surface water-recreational UGI surface water river dermal, ingestion, inhalation river users past, present, future exposed population

fish UGI fish river fishing ingestion persons who consume fish from the river past, present, future environmental media, point of exposure, exposed population

surface water-public water supply UGI surface water Lancaster City Water intake dermal, ingestion, inhalation potable water supply customers past, present, future environmental media, exposed population

Table 12. Estimated Population Potentially Affected By Potential Exposure Pathway

Potentially Exposed Populations That Would Be Affected If Pathways Were Completed

Group/Location Estimated Number Pathway Type Contaminants in the Pathway

residents of cottages 12 groundwater benzene, ethylbenzene, naphthalene, toluene

recreational users of river unknown sediment arsenic, B[a]P

recreational users of river unknown surface water-recreational benzene

people who consume fish from the Susquehanna River unknown fish arsenic, B[a]P

people who use Lancaster City's public water supply 105,000 surface water-public water supply benzene, ethylbenzene, naphthalene, toluene

Table of Contents

Agency for Toxic Substances and Disease Registry, 1825 Century Blvd, Atlanta, GA 30345
Contact CDC: 800-232-4636 / TTY: 888-232-6348

Department of Health and Human Services

Contaminant	Location	Maximum Concentration mg/kg (solid)	Comparison Value
Contaminant	Location	Maximum Concentration mg/kg (solid)	mg/kg	Source
arsenic	relief holder	ND	0.4	CREG
benzene	relief holder	320	20	CREG
B[a]P	relief holder	ND	0.1	CREG
ethylbenzene	relief holder	1,200	5,000^a	RMEG
naphthalene	relief holder	1,320	NA	-
toluene	relief holder	920	10,000^a	RMEG

Contaminant	Location	Maximum Concentration µg/L (liquid)	Comparison Value
Contaminant	Location	Maximum Concentration µg/L (liquid)	µg/L	Source
arsenic	relief holder	270.0	0.02	CREG
benzene	relief holder	8,100	1	CREG
B[a]P	relief holder	530	0.005	CREG
ethylbenzene	relief holder	3,800	1,000^a	RMEG
naphthalene	relief holder	25,000	20	LTHA
toluene	relief holder	7,900	2,000^a	RMEG

Contaminant	Location	Maximum Concentration mg/kg	Comparison Value
Contaminant	Location	Maximum Concentration mg/kg	mg/kg	Source
arsenic	Subsoil 4	11.8	0.4	CREG
benzene	Subsoil 4	0.094	20	CREG
B[a]P	Subsoil 4	19	0.1	CREG
ethylbenzene	Subsoil 4	0.12	5,000^a	RMEG
naphthalene	Subsoil 4	13	NA	-
toluene	Subsoil 4	0.022	10,000^a	RMEG

Contaminant	Location	Maximum Concentration µg/L	Comparison Value
Contaminant	Location	Maximum Concentration µg/L	µg/L	Source
arsenic	MW3S,MW3D	2	0.02	CREG
benzene	MW3S	310,000	1	CREG
B[a]P	MW3S	150	0.005	CREG
ethylbenzene	MW3S	60,000	1,000^a	RMEG
naphthalene	MW3S	7,600	20	LTHA
toluene	MW3S	190,000	2,000^a	RMEG

Pathway Name	Exposure Pathway Elements					Time
Pathway Name	Source	Environmental Medium	Point of Exposure	Route of Exposure	Exposed Population	Time
tunnel tars	UGI	direct contact	on site	dermal, inhalation	employee	past
tunnel tars	UGI	air	on site	inhalation	employees	past
purifier chips	UGI	air	on site	inhalation	employees	past

Potentially Exposed Populations Affected by a Completed Pathway
Location	Estimated Number	Pathway Type	Contaminants in the Pathway
on site	1	direct contact	coal tar
on site tunnel tars and purifier chips	fewer than 50	air	coal tar-related volatiles

Potentially Exposed Populations That Would Be Affected If Pathways Were Completed
Group/Location	Estimated Number	Pathway Type	Contaminants in the Pathway
residents of cottages	12	groundwater	benzene, ethylbenzene, naphthalene, toluene
recreational users of river	unknown	sediment	arsenic, B[a]P
recreational users of river	unknown	surface water-recreational	benzene
people who consume fish from the Susquehanna River	unknown	fish	arsenic, B[a]P
people who use Lancaster City's public water supply	105,000	surface water-public water supply	benzene, ethylbenzene, naphthalene, toluene