Data Series 197 Table 5

Seasonal Changes in Concentrations of Dissolved Pesticides and Organic Carbon in the Sacramento–San Joaquin Delta, California, 1994–1996

[Sites 1, 10, 18, 26, and 28 were not sampled during the period. The following pesticides were not detected in any samples: alachlor, atrazine, butylate, carbaryl, carbofuran, chlorpyrifos, cyanazine, diazinon, EPTC, fonofos, malathion, methidathion, molinate, napropamide, pebulate, simazine, thiobencarb, and trifluralin. Concentrations are shown in nanograms per liter. Numbers in brackets are USGS National Water Information System (NWIS) parameter codes. hh, hours; id, identification; mm, minutes; mm/dd/yyyy, month/day/year; nd, not detected; ( ), detected at a concentration less than the method detection limit]

Site id number	Date (mm/dd/yyyy)	Time (hh:mm)	DCPA [39771]	Metolachlor [39415]
2	9/21/1994	19:40	nd	nd
3	9/26/1994	16:25	nd	nd
4	9/26/1994	15:32	nd	nd
5	9/26/1994	13:50	nd	(22)
6	9/22/1994	14:12	nd	nd
7	9/28/1994	10:45	nd	nd
8	9/21/1994	15:25	nd	nd
9	9/23/1994	14:00	nd	71
11	9/27/1994	19:15	nd	nd
12	9/27/1994	13:16	nd	nd
13	9/26/1994	15:52	nd	nd
14	9/26/1994	13:20	nd	nd
15	9/26/1994	12:19	nd	nd
16	9/28/1994	09:50	nd	nd
17	9/22/1994	14:35	nd	nd
19	9/28/1994	11:14	nd	nd
20	9/21/1994	13:20	nd	nd
21	9/21/1994	08:30	nd	nd
22	9/21/1994	10:00	nd	nd
23	9/22/1994	12:18	nd	nd
24	9/27/1994	16:00	nd	nd
25	9/23/1994	13:00	nd	(33)
27	9/22/1994	13:23	nd	nd
29	9/26/1994	14:25	(20)	(39)
30	9/22/1994	16:25	nd	nd
31	9/27/1994	12:24	nd	nd

Site id number

Date (mm/dd/yyyy)

Time (hh:mm)

DCPA [39771]

Metolachlor [39415]

9/21/1994