PUBLIC HEALTH ASSESSMENT
UGI COLUMBIA GAS PLANT
COLUMBIA, LANCASTER COUNTY, PENNSYLVANIA

APPENDIX A. Figures

FIGURE 1

FIGURE 2

FIGURE 3

FIGURE 4

FIGURE 5

FIGURE 6

FIGURE 7

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	5,000a	RMEG
naphthalene	relief holder	1,320	NA	-
toluene	relief holder	920	10,000a	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	1,000a	RMEG
naphthalene	relief holder	25,000	20	LTHA
toluene	relief holder	7,900	2,000a	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	5,000a	RMEG
naphthalene	Subsoil 4	13	NA	-
toluene	Subsoil 4	0.022	10,000a	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	1,000a	RMEG
naphthalene	MW3S	7,600	20	LTHA
toluene	MW3S	190,000	2,000a	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	5,000a	RMEG
naphthalene	Subsoil 2	73	NA	-
toluene	All	ND	10,000a	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	1,000a	RMEG
naphthalene	MW6D	5,650	20	LTHA
toluene	MW6D	2,100	2,000a	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	5,000a	RMEG
naphthalene	SS2	12	NA	-
toluene	SD1,2,3,4	ND	10,000a	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	1,000a	RMEG
naphthalene	SW1,2,3,4,5	ND	20	LTHA
toluene	SW3	4	2,000a	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

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