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

APPENDIX A. Figures

Figure 1
FIGURE 1

Figure 2
FIGURE 2

Figure 3
FIGURE 3

Figure 4
FIGURE 4

Figure 5
FIGURE 5

Figure 6
FIGURE 6

Figure 7
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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