USGS Open-File Report 01-282 -- Table 3

Open-File Report 01-282

Sediment-Deposition Rates and Organic Compounds in Bottom Sediment at Four Sites in Lake Mead, Nevada, May 1998

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Table 3. Depth intervals and cesium-137 concentrations in bottom-sediment cores at four sites in Lake Mead, May 1998

[Abbreviations: ¹³⁷Cs, cesium-137; pCi/g, picocuries per gram. Symbol: <, less than]

Site 1: Las Vegas Bay -- shallow		Site 2: Las Vegas Bay -- deep		Site 3: Overton Arm		Site 4: Colorado and Virgin Rivers confluence (pre-impoundment)
Depth interval (centimeters)	¹³⁷Cs (pCi/g)	Depth interval (centimeters)	¹³⁷Cs (pCi/g)	Depth interval (centimeters)	¹³⁷Cs (pCi/g)	Depth interval (centimeters)	¹³⁷Cs (pCi/g)
0-3	<0.17	0-5	<0.11	0-1.5	0.34	0-1	<1.83
3-6	.08	5-10	<.15	1.5-3	.32	1-2	<.49
6-9	<.06	10-15	<.18	3-4.5	.25	2-3	<.49
9-12	<.10	15-20	.08	4.5-6	.33	3-4	<.44
12-15	<.06	20-25	.12	6-7.5	.30	4-5	<.21
15-18	<.06	25-30	.07	7.05-09	<.22	5-6	.18
18-21	<.08	30-35	.15	9-10.5	.30	6-7	.20
21-24	.11	35-40	.40	10.5-12	.30	7-8	.19
24-27	<.05	40-45	.30	12-13.5	.31	8-9	.26
27-30	<.10	45-50	.23	13.5-15	.34	9-10	.29
30-33	<.08	50-55	.26	15-16	.37	10-11	.50
33-36	<.08	55-60	.72	16-17	.41	11-12	.71
36-39	<.12	60-65	.76	17-18	.51	12-13	.66
39-42	<.08	65-70	.31	18-19	.56	13-14	.50
42-45	<.07	70-75	.44	19-20	.58	14-15	.76
45-50	<.12	75-80	.58	20-21	.53	15-16	.74
50-55	.18	80-85	.40	21-22	.30	16-17	.75
55-60	.33	85-90	.17	22-23	.27	17-18	.84
60-65	.24	90-95	.14	23-24	.41	18-19	.70
65-70	.46	95-100	<.13	24-25	.32	19-20	.71
70-75	.25	100-105	<.12	25-26	.35	20-21	.95
75-80	.73	105-110	<.15	26-27	.29	21-22	.86
80-85	.82	110-115	<.10	27-28	.36	22-23	.88
85-90	.98	115-120	<.08	28-29	.46	23-24	.94
90-95	.44	120-125	<.06	29-30	.60	24-25	.64
95-100	.60	125-130	<.05	30-31	.66	25-26	.68
100-105	.98			31-32	.67	26-27	.76
105-110	.78			32-33	.47	27-28	.85
110-115	.29			33-34	.33	28-29	.63
115-120	<.08			34-36	.33	29-30	.52
120-125	.15			36-37	.30	30-31	.37
125-130	.11			37-38	.37	31-32	.47
130-135	<.11			38-39	.39	32-33	.45
				39-40	.60	33-34	.45
				40-41	.48	34-35	.50
				41-42	.30	35-36	.52
				42-43	.33	36-38	.44
				43-44	.40	38-39.5	<.23
				44-45	.49	39.5-41	.38
				45-46	.69	41-42.5	.23
				46-47	.65	42.5-44	<.23
				47-48	.51	44-45.5	.23
				48-49	.45	45.5-47	.24
				49-49.9	<.16	47-48.5	<.24
				49.9-51	<.12	48.5-50	.19
				51-52	<.15	50-51.5	<.24
				52-53	<.22	51.5-53	.18
				53-54	.37	53-54.5	<.22
				54-55	.53	54.5-56	<.15
				55-56	.59	56-57.5	<.22
				56-57	.62	57.5-59	<.15
				57-58	.32	59-60.5	<.16
				58-59	.35	60.5-62	<.29
				59-60	.37	62-64	<.08
				60-61.5	.35	64-66	<.10
				61.5-63	.35	66-68	<.11
				63-64.5	.39	68-70	<.12
				64.5-66	.33	70-72	<.08
				66-67.5	.56	72-74	<.12
				67.5-69	.68	74-76	<.08
				69-70.5	.33	76-78	<.08
				70.5-72	<.11	78-80	<.09
				72-73.5	<.07	80-82	<.09
				73.5-75	<.08	82-84	<.06
						84-86	<.12
						86-88	<.07
						88-90	<.12
						90-92	<.08
						92-94	<.13
						94-96	<.08
						96-98	<.12
						98-100	<.07
						100-102	<.13
						102-104	<.08
						104-106	<.12
						106-108	<.07
						108-110	<.12
						110-112	<.08
						112-114	<.12