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PUBLIC HEALTH ASSESSMENT

ORDNANCE PRODUCTS, INCORPORATED
NORTHEAST, CECIL COUNTY, MARYLAND

TABLES

List of Tables
Table 1.	On-Site Soil: AREA A1 - Surface (27) and Subsurface (2) Soil Sampling (ppm)
Table 2.	On-Site Soil: AREA A2 - Surface (17) and Subsurface (1) Soil Sampling (ppm)
Table 3.	On-Site Soil: AREA B - Surface (10) and Subsurface (2) Soil Sampling (ppm)
Table 4.	On-Site Soil: AREA C - Surface (21) and Subsurface (2) Soil Sampling (ppm)
Table 5.	On-Site Soil: AREA'S D and E - Surface (8) and Subsurface (1) Soil Samples (ppm)
Table 6.	On-Site Soil: AREA F - Surface (23) and Subsurface (10) Soil Samples (ppm)
Table 7.	On-Site Soil: AREA H1 - Surface (17) and (3) Subsurface Soil Samples (ppm)
Table 8.	On-Site Soil: AREA H2 - Surface (13) and Subsurface (3) Soil Samples (ppm), Metals
Table 9.	On-Site Soil (ppb), Volatile Organics
Table 10.	Sediment
Table 11.	On-Site Surface Water (ppb)
Table 12.	On-Site Monitoring Wells (ppb)
Table 13.	Residential wells, 1988 (ppb)
Table 14.	Residential Wells: Samples Taken from Nonfiltered Water, 1988-1992 (ppb)
Table 15.	Residential Wells: Samples Taken from Tap Water, 1988-1992 (ppb)
Table 16.	Off-Site Surface Water (ppb)
Table 17.	Off-Site Monitoring Wells, 1993 (ppb)
Table 18.	Completed Exposure Pathways
Table 19.	Potential Exposure Pathways

Table 1. On-Site Soil

AREA A1.
Surface (27) and Subsurface (2) Soil Sampling (ppm)
METALS	Highest Concentration	Concentration Range	Comparison Value	# SamplesExceededCV's
Antimony	29	<12-29	20 RMEG	1
Cadmium	35	<1.1-35	40 EMEG	0
Chromium (VI)	200	22-200	300 RMEG	0
Copper	150	12-150	NA	NA
Lead	2070	<6-2070	NA	NA
Nickel	330	7-330	1000 RMEG	0
Zinc	15,000	20-15,000	20,000 RMEG	0
Arsenic	6.1	1.8-6.1	0.4 CREG	29
Mercury (inorganic)	<0.5	<0.5	NA	0
Silver	<1.4	<1.1-<1.4	300 RMEG	0
Selenium^*	<6.7	<0.55-<6.7	200 EMEG	0

Source: O'Brien and Gere, June 1990.
^*The detection limit for selenium was elevated due to matrix interferences.

Table 2. On-Site Soil

AREA A2.
Surface (17) and Subsurface (1) Soil Sampling (ppm)
METALS	Highest Concentration	Concentration Range	Comparison Value	# Samples ExceededCV's
Antimony	<12	<12-<15	20 RMEG	0
Cadmium	<1.5	<1.2-<1.5	40 EMEG	0
Chromium(VI)	55	12-55	300 RMEG	0
Copper	29	15-29	NA	NA
Lead	310	13-310	NA	NA
Nickel	36	12-36	1000 RMEG	0
Zinc	130	44-130	20,000 RMEG	0
Arsenic	7.4	1.7-7.4	0.4 CREG	18
Mercury	<0.5	<0.5	NA	0
Silver	<1.5	<1.2-<1.5	300 RMEG	0
Selenium^*	2.0	<0.67-<6.6	200 RMEG	0

Source: O'Brien and Gere, June 1990.
^*The detection limit for selenium was elevated due to matrix interferences.

Table 3. On-Site Soil

AREA B.
Surface (10) and Subsurface (2) Soil Sampling (ppm)
METALS	Highest Concentrations	Concentration Range	Comparison Value (CV)	# Samples Exceeded CV's
Antimony	<14	<13-<14	20 RMEG	0
Cadmium	<1.4	<1.3-<1.4	40 EMEG	0
Chromium(VI)	57	31-57	300 RMEG	0
Copper	70	13-70	NA	NA
Lead	35	9-35	NA	NA
Nickel	23	8-23	1000 RMEG	0
Zinc	150	18-150	20,000 RMEG	0
Arsenic	5.7	2.7-5.7	0.4 CREG	12
Mercury	<0.5	<0.5	NA	0
Silver	<1.4	<1.3-<1.4	300 RMEG	0
Selenium^*	<6.6	<0.61-<6.6	200 RMEG	0

Source: O'Brien and Gere, June 1990.
^*The detection limit for selenium was elevated due to matrix interferences.

Table 4. On-Site Soil

AREA C - Surface (21) and Subsurface (2) Soil Sampling (ppm)

Table 1.
Human Health Effects at Various Hydrogen Sulfide Concentrations in Air
METALS	Highest Concentrations	Range	Comparison Values (CV)	# Samples Exceeded CV's
Antimony	<14	<11-<14	20 RMEG	0
Cadmium	<1.4	<1.1-<1.4	40 EMEG	0
Chromium(VI)	530	28-530	300 RMEG	1
Copper	29	10-29	NA	NA
Lead	53	<6-53	NA	NA
Nickel	670	<6-670	1000 RMEG	0
Zinc	850	11-850	20,000 RMEG	0
Arsenic	5.0	<0.64-5	0.4 CREG	23
Mercury	<0.5	<0.5	NA	0
Silver	<1.4	<1.1-<1.4	300 RMEG	0
Selenium^*	4.1	<0.54-4.1	200 RMEG	0

Source: O'Brien and Gere, June 1990.
^*The detection limit for selenium was elevated due to matrix interferences.

Table 5. On-Site Soil

AREA'S D and E.
Surface (8) and Subsurface (1) Soil Samples (ppm)
METALS	Highest Concentrations	Concentration Range	Comparison Value (CV)	# Samples Exceeded CV's
Antimony	<17	<11-<17	20 RMEG	0
Cadmium	<1.7	<1.1-<1.7	40 EMEG	0
Chromium(VI)	89	25-89	300 RMEG	0
Copper	27	7-27	NA	NA
Lead	52	9-52	NA	NA
Nickel	41	8-41	1000 RMEG	0
Zinc	330	32-330	20,000 RMEG	0
Arsenic	9.3	1.2-9.3	0.4 CREG	9
Mercury	<0.5	<0.5	NA	0
Silver	<1.7	<1.1-<1.7	300 RMEG	0
Selenium^*	<7.0	<0.69-<7.0	200 RMEG	0

Source: O'Brien and Gere, June 1990.
^*The detection limit for selenium was elevated due to matrix interferences.

Table 6. On-Site Soil

AREA F.
Surface (23) and Subsurface (10) Soil Samples (ppm)
METALS	Highest Concentrations	Concentration Range	Comparison Value (CV)	# Samples Exceeded CV's
Antimony	<13	<11-<13	20 RMEG	0
Cadmium	15	<1.1-15	40 EMEG	0
Chromium (VI)	1900	20-1900	300 RMEG	5
Copper	92	6-92	NA	NA
Lead	3300	<5.5-3300	NA	NA
Nickel	3700	8-3700	1000 RMEG	3
Zinc	2800	12-2800	20,000 RMEG	0
Arsenic	3.6	0.99-3.6	0.4 CREG	33
Mercury	<0.5	<0.5	NA	0
Silver	5	<1.1-5	300 RMEG	0
Selenium^*	<6.5	<0.55-<6.5	200 RMEG	0

Source: O'Brien and Gere, June 1990.
^*The detection limit for selenium was elevated due to matrix interferences.

Table 7. On-Site Soil

AREA H1.
Surface (17) and (3) Subsurface Soil Samples (ppm)
METALS	Highest Concentrations	Concentration Range	Comparison Values (CV)	# Samples Exceeded CV's
Antimony	25	<13-25	20 RMEG	1
Cadmium	4.2	<1.3-4.2	40 EMEG	0
Chromium (VI)	94	27-94	300 RMEG	0
Copper	38	13-38	NA	NA
Lead	76	7-76	NA	NA
Nickel	58	10-58	1000 RMEG	0
Zinc	1500	31-1500	20,000 RMEG	0
Arsenic	4.7	1.1-4.7	0.4 CREG	20
Mercury	<0.5	<0.5	NA	0
Silver	<2.0	<1.3-<2.0	300 RMEG	0
Selenium^*	<7.2	<0.62-<7.2	200 RMEG	0

Source: O'Brien and Gere, June 1990.
^*The detection limit for selenium was elevated due to matrix interferences.

Table 8. On-Site Soil

AREA H2.
Surface (13) and Subsurface (3) Soil Samples (ppm), Metals
METALS	Highest Concentrations	Concentration Range	Comparison Values (CV)	# Samples Exceeded CV's
Antimony	<14	<11-<14	20 RMEG	0
Cadmium	<1.4	<1.1-<1.4	40 EMEG	0
Chromium (VI)	82	22-82	300 RMEG	0
Copper	14	7-14	NA	NA
Lead	47	6-47	NA	NA
Nickel	17	<6-17	1000 RMEG	0
Zinc	400	7-400	20,000 RMEG	0
Arsenic	5.5	1.6-5.5	0.4 CREG	16
Mercury	<0.5	<0.5	NA	0
Silver	<1.4	<1.1-<1.4	300 RMEG	0
Selenium^*	<6.9	<0.56-<6.9	200 RMEG	0

Source: O'Brien and Gere, June 1990.
^*The detection limit for selenium was elevated due to matrix interferences.

Table 9.
On-Site Soil (ppb), Volatile Organics
CONTAMINANTS	Area E	Area F	Area H1	Area H2	Comparison Value
Vinyl Chloride	<16	<13	<20	<13	1000 EMEG
t-1,2-Dichloroethene	<16	<13	490	<13	1,000,000 RMEG
Trichloroethene	<16	<13	1600	13	60,000 CREG
Tetrachloroethylene	<16	15	77	560	10,000 CREG
Toluene	<16	<13	<20	<13	10,000,000 RMEG
Xylenes	18	<13	<20	<13	100,000,000 RMEG

Source: O'Brien and Gere, June 1990.

Table 10.
Sediment
CONTAMINANTS	Maximum Levels in Impoundments (11/89)	Maximum Levels in Impoundments (6/91)	Maximum Levels in Streams (11/89)	ComparisonValues
METALS (ppm)
Antimony	140	<16	<19	20 RMEG
Cadmium	900	140	<1.9	30 RMEG
Chromium (VI)	39,000	1700	99	300 RMEG
Lead	820	32	380	NA
Nickel	73	33	32	1000 RMEG
Zinc	51,000	1900	140	20,000RMEG
Arsenic	<18.3	2	4.1	0.4 CREG
ORGANICS (ppb)
Vinyl Chloride	<67		<19	1000 EMEG
t-1,2-Dichloroethene	66		<19	1x10⁶RMEG
Trichloroethene	83		<19	60,000CREG
Tetrachloroethylene	<67		<19	10,000CREG
Toluene	200		3	1x10⁷RMEG

Source: O'Brien and Gere, June 1994.

Table 11.
On-Site Surface Water (ppb)
CONTAMINANTS	Stream Samples	Impoundment Samples	Surface Water Samples (Area D)	Drinking Water Comparison Value
Vinyl Chloride	<1	<1	<1	0.2 EMEG
t-1,2-Dichloroethene	6	18	65	200 RMEG
Trichloroethene	19	6	79	3 CREG
Tetrachloroethylene	7	<1	320	0.7 CREG
Toluene	3	3	<1	2000 RMEG
Xylenes	<1	<1	<1	20,000 RMEG

Samples also analyzed for antimony, beryllium, cadmium, chromium, nickel, thallium, mercury,lead, selenium, silver, zinc, copper and arsenic - no samples exceeded ATSDR drinking watercomparison values.
Source: O'Brien and Gere, June 1994.

Table 12.
On-Site Monitoring Wells (ppb)
CONTAMINANTS	Maximum Concentration found in Monitoring Wells	MaximumConcentration found in Monitoring Wells	Maximum Concentration found in Supply Wells	Comparison Value
Date	1989	1992	1989
Inorganics
Arsenic			7	0.02 CREG
Organics
1,2-Dichloroethene (total)	260	820	100	70 MCL
Tetrachloroethylene	1900	4300	38	0.7 CREG
Trichloroethene	2800	980	97	3 CREG
Vinyl Chloride	11	2	57	0.2 EMEG

*Detection limits for sampling above comparison values
Source: O'Brien and Gere, June 1994.

Table 13.
Residential wells, 1988 (ppb)
CONTAMINANTS	RW 1	RW 14 on-site	RW 45	RW 46	RW 47	RW 48	Comparison Value
1,1-Dichloroethene		2					0.06 CREG
t-1,2-Dichloroethene		200				2	200 RMEG
Tetrachloroethylene		68					0.7 CREG
Trichloroethene	2	160	1	10		46	3 CREG
Vinyl Chloride		90					0.2 EMEG

Source: O'Brien and Gere, April 1993, Table 13.

Table 14.
Residential Wells: Samples Taken from Nonfiltered Water, 1988-1992 (ppb)
CONTAMINANTS	RW 1	RW 45	RW 46	RW 47	RW 48	RW 53	Comparison Value
Acetone						59,500	1000 RMEG
Benzene	2		1			--
Chloroform						22	6 CREG
t-1,2 Dichloroethene	1	2	2	21	31	--	200 RMEG
Ethyl Acetate						35	9000 RMEG
Ethyl Benzene						32	1000 RMEG
Methylene Chloride		2	2	2	5	1800	5 CREG
Methyl Ethyl Ketone						16,600	6000 RMEG
2-Propanol						12,234
Tetrachloroethylene					1	--	0.7 CREG
Toluene	2	4	1	2	2	40	2000 RMEG
Trichloroethene	3	29	57	120	145	--	3 CREG
Xylenes (total)						111	20,000 RMEG

Source: O'Brien and Gere, April 1993, Table 14.

Table 15.
Residential Wells: Samples Taken from Tap Water, 1988-1992 (ppb)
CONTAMINANTS	RW 1	RW 45	RW 46	RW 47	RW 48	RW 53	Comparison Value
Methylene chloride		2		5			5 CREG
Trichloroethene		14					3 CREG

Source: O'Brien and Gere, April 1993, Table 14b.

Table 16.
Off-Site Surface Water (ppb)
CONTAMINANTS	Maximum Concentrations from Little Northeast Creek	Maximum Concentrations from Off-site Surface Water	Drinking Water Comparison Values	Ambient Water Quality Criteria
	1987	1993
1,2-Dichloroethene (total)	2.0	4.0	70.0 MCL	NA
Tetrachloroethylene	<1.0	5.0	0.7 CREG	8.0
Trichloroethene	5.0	17.0	3.0 CREG	27.0

sampling locations for 1987 Sampling:
1. near 411 Stevenson Rd (5 ppb TCE)
2. drainage ditch near 22 Deans Lane (2 ppb TCE/2 ppb DCE)

sampling locations for 1993 Sampling: refer to map

Source: O'Brien and Gere, April 1993, Table 15.

Table 17.
Off-Site Monitoring Wells, 1993 (ppb)
CONTAMINANTS	Maximum Concentration	Number of wells exceeding CV's	Comparison Value
Trichloroethene	2800	3 (MW-2S, MW- 3S,MW-3D)	3 CREG

Source: O'Brien and Gere, June 1994, Table 11

Table 18.
Completed Exposure Pathways
Pathway	Source	Environmental Media	Point of Exposure	Route of Exposure	Exposed Population	Time
Air	Ordnance Site	Air	Residences Ordnance Site	Inhalation	Nearby Residents and Employees at Ordnance	Past
Private Wells	Ordnance Site	Ground Water	Residences (tap)	Ingestion Inhalation Skin Contact	Residents along Mechanics Valley Road	Past Present Future
Surface Soil	Ordnance Site	Surface Soil	Ordnance Site	Ingestion	Employees of MVTC and trespassers	Past Present Future

Table 19.
Potential Exposure Pathways
Pathway	Source	Environmental Media	Point of Exposure	Route of Exposure	Exposed Population	Time
Sediment	Ordnance Site	Sediment	Impoundments, On-Site Streams, Little Northeast Creek	Ingestion	Children, Employees at MVTC and trespassers	Past Present Future
Ground Water	Ordnance Site	Ground Water	Residences, Businesses at MVTC	Ingestion	Residents, Employees at MVTC	Past Present Future
Surface Water	Ordnance Site	Impoundments and Streams	Impoundments and Streams	Ingestion	Children, Employees at MVTC and Trespassers	Past Present Future
Soil (off-site)	Ordnance Site	Runoff and overflow from the Impoundments	Residential Soil or Soil on or around Road	Inhalation/Ingestion	Residents	Past Present Future
Ordnance	Ordnance Site	Shallow Buried Ordnance	On-Site Areas Where Ordnance is Known to be Buried	Explosion	Employees at MVTC, Trespassers	Past Present Future
Fish	Ordnance Site	Little Northeast Creek	Residence	Ingestion	Little Northeast Creek Fisheaters	Past Present Future

FIGURES

List of Figures
Figure 1. Figure 2. Figure 3. Figure 4. Figure 5.	Site Location Map Areas of Concern Sediment and Surface Water Sample Location Map Surface Water Samples Groundwater Monitoring Well Location Map

Figure 1. Site Location Map

Figure 2. Areas of Concern

Figure 3. Sediment and Surface Water Sample Location Map

Figure 4. Surface Water Samples

Figure 5. Groundwater Monitoring Well Location Map

1. ¹Sentinel birth defects are immediately evident at birth. The World Health Organizationdevised the list of sentinel defects years ago. It was adopted by the 1981 Maryland law thatestablished Maryland's birth defect registry.

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Page last reviewed: April 5, 2010
Page last updated: April 5, 2010
Content source: Agency for Toxic Substances and Disease Registry

Agency for Toxic Substances and Disease Registry, 4770 Buford Hwy NE, Atlanta, GA 30341
Contact CDC: 800-232-4636 / TTY: 888-232-6348

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