1. (a) Composite samples shall not be allowed; rather, an O/O shall collect one discrete sample from each sampling point.
2. (b) If a PWS draws water from more than one source and the sources are combined before distribution, a sample of the combined or blended water shall be taken, if specified in the sampling schedule, to satisfy that system’s chemical monitoring requirements as specified in Env-Dw 707 and Env-Dw 710 through Env-Dw 713.

3. (c) The department shall approve a blended sample if:

   1. (1) The sources are combined before entry to the distribution system;
   2. (2) Where there are multiple sources, the sources are operated simultaneously or automatically alternated between pump operating cycles; and
   3. (3) The sample is collected at the entry point to the distribution system.
4. (d) If a PWS draws water from more than one source and the sources are not combined before distribution, a sample of each source shall be taken, as specified in the sampling schedule, to satisfy that system’s chemical monitoring requirements as specified in Env-Dw 707, Env-Dw 708, and Env-Dw 710 through Env-Dw 713.

Source. #9700, eff 5-1-10; amd by #10771, eff 2-1-15; ss by #12667, eff 1-1-19