Section 4.2.5 TABLES

Table 4-16. Maximum SRS boundary-line concentrations resulting from a year of construction activities under alternative A (in micrograms per cubic meter of air).

			Average increaseb (µg/m3)				SCDHECc	Baseline + increase as percent of standard
Pollutant	Averaging time	Baselinea (µg/m3)	Expected	Minimum	Maximum		standard (µg/m3)	Expected	Minimum	Maximum
Nitrogen oxides	1 year	14	0.01	<0.01d	0.02	100	100	14	14	14
Sulfur dioxide	3 hours	857	37.06	17.61	414		1,300	69	67	98
	24 hours	213	0.70	0.34	7.82		365	59	58	60
	1 year	17	<0.01	<0.01	<0.01		80	21	21	21
Carbon monoxide	1 hour	171	769	394	7,751		4.0´104	2	1	20
	8 hours	22	54	62	1,177		1.0´104	1	1	12
Total suspended particulates	1 year	43	0.01	0.01	0.06		75	57	57	57
Particulate matter less	24 hours	85	2.71	1.30	28.00		150	59	58	75
than 10 microns in diameter	1 year	25	0.02	0.01	0.09		50	50	50	50

a. Source: Stewart (1994).

b. Source: Hess (1994a).

c. Source: SCDHEC (1976).

d. < is read as "less than."

Table 4-17. Changes in maximum ground-level concentrations of air pollutants at the SRS boundary for alternative A - expected, minimum, and maximum waste forecasts (micrograms per cubic meter of air).

	Averaging	Existing sources	Regulatory standards	Background concentration	Increase in concentration (µg/m3)			Percent of standarde
Pollutant	time	(µg/m3)a,b	(µg/m3)c	(µg/m3)d	Expectedb	Minimum	Maximum	Expected	Minimum	Maximum
Nitrogen oxides	1 year	6	100	8	0.46	0.46	0.47	14	14	14
Sulfur dioxides	3 hours	823	1,300	34	3.78	3.78	3.79	66	66	66
	24 hours	196	365	17	0.69	0.69	0.69	59	59	59
	1 year	14	80	3	0.23	0.23	0.23	22	22	22
Carbon monoxide	1 hour	171	40,000	NAf	22.93	22.93	22.93	0.5	0.5	0.5
	8 hours	22	10,000	NA	5.37	5.37	5.37	0.3	0.3	0.3
Total suspended particulates	1 year	13	75	30	2.01	2.01	2.01	60	60	60
Particulate matter	24 hours	51	150	34	4.61	4.61	4.61	60	60	60
less than 10 microns in diameter	1 year	3	50	22	0.10	0.10	0.10	50	50	50
Lead	3 months	4.0´10-4	1.50	0.01	8.0´10-6	4.9´10-6	6.2´10-6	0.8	0.8	0.8
Gaseous fluorides	12 hours	2	3.70	NA	0.00187	0.00187	0.00187	54	54	54
(as hydrogen fluoride)	24 hours	1	2.90	NA	9.3´10-4	9.3´10-4	9.3´10-4	35	35	35
	1 week	0.4	1.60	NA	3.5´10-4	3.5´10-4	3.5´10-4	25	25	25
	1 month	0.1	0.80	NA	9.0´10-5	9.0´10-5	9.0´10-5	13	13	13

a. Micrograms per cubic meter of air.

b. Source: Stewart (1994).

c. Source: SCDHEC (1976).

d. Source: SCDHEC (1992).

e. Percent of standard = 100 (existing + background + increase) divided by the regulatory standard.

f. NA = not applicable.

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