Benchmarks

Table 2. Chlorinated hydrocarbon concentrations ( $\backslash mu\backslash text\{g/liter\}$ ) in major southern California municipal wastewaters, 1977–78.*

	Flow ( $10^\{11\}$ liters/yr)	p-DCB	o-DCB	1,2,4- TCB**	HCB	Total CB	PCB 1242	PCB 1254	Total DDT
Los Angeles
City 5-Mile
18-24 Jul 77	4.41	3.4	1.9	0.061	0.007	5.3	0.10	0.10	0.025
16-22 Dec 77		5.5	4.1	0.92	—	11	0.054	0.048	0.017
14-20 Aug 78	4.71	4.6	2.2	0.71	0.009	7.4	0.037	0.086	0.020
12-18 Dec 78		3.3	3.3	1.5	0.003	8.1	0.024	0.077	0.018
City 7-Mile
18-24 Jul 77	0.064	45	26	2.9	0.95	76	16	10	2.0
16-22 Dec 77		77	15	12	—	100	2.8	3.5	0.39
14-20 Aug 78	0.064	0.75	10	18	0.36	29	8.8	9.1	1.1
12-18 Dec 78		18	50	23	0.30	92	10	9.8	1.2
County
22-28 Jul 77	4.63	5.3	6.8	0.15	0.49	13	0.69	0.22	1.2
15-21 Dec 77		5.4	8.6	2.7	0.14	17	0.33	0.12	0.90
11-17 Aug 78	4.77	6.0	9.9	2.6	0.056	19	0.27	0.14	1.4
8-14 Dec 78		3.9	7.6	3.3	0.049	15	0.12	0.11	0.58
Orange
County
22-30 Jul 77	2.47	1.6	1.6	0.016	0.10	3.3	4.8	0.64	0.019
16-22 Dec 77		4.3	3.4	0.24	—	7.9	2.3	0.28	0.027
5-14 Oct 78	2.53	2.3	1.5	0.30	0.032	4.2	0.75	0.34	0.076
7-13 Dec 78		2.3	3.7	0.34	0.025	6.3	0.03	0.23	0.030
San Diego
City
25-31 Jul 77	1.60	3.1	2.5	0.024	0.069	5.6	0.39	0.24	0.16
15-21 Dec 77		5.0	4.3	0.43	—	9.7	0.18	0.20	0.099
21-28 Aug 78	1.76	4.7	3.5	0.48	0.062	8.7	0.18	0.21	0.54
5-12 Dec 78		7.2	7.1	0.54	0.007	15	0.14	0.12	0.051
Oxnard City
18-22 Jul 77	0.15	4.5	2.2	0.023	0.010	6.7	0.021	0.040	0.082
13-17 Dec 77		8.3	4.4	0.46	—	13	—	0.020	0.016
14-18 Aug 78	0.20	5.4	3.0	0.26	0.020	8.7	—	0.067	0.049
11-15 Dec 78		7.4	8.4	0.62	0.007	16	—	0.064	0.14

*Each seasonal value based on two replicate samples of 1-week composites.

**1, 3, 5-TCB not analyzed after 1976.

184