§910.TABLE B. Nighttime long-term background ambient Leq levels in decibels by land use categories and 1/3 octave-band level

	Background Category
Octave-Band Center Frequency (Hz)		1	2	3	4	5
20		53	48	43	37	31
25		54	49	44	38	32
31		55	50	45	39	33
40		55	50	46	39	33
50		56	51	46	40	34
63		56	51	47	41	35
80		57	52	47	41	35
100		58	52	48	42	36
125		57	51	47	41	35
160		56	51	47	41	35
200		56	50	46	40	34
250		55	50	45	39	33
315		54	49	44	38	32
400		53	47	43	37	31
500		52	46	41	35	29
630		51	45	39	33	27
800		50	43	37	31	25
1000		48	41	35	29	23
1250		46	39	33	27	21
1600		44	37	31	25	19
2000		42	35	28	23	16
2500		40	33	25	20	14
3150		39	31	23	18	12
4000		38	29	20	15	10
5000		36	27	18	13	8
6300		34	25	16	11	5
8000		33	23	14	9	3
10,000		31	21	12	7	1
12,500		29	19	10	2