Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 611 - PRIMARY DRINKING WATER STANDARDS
Subpart Z - ENHANCED TREATMENT FOR CRYPTOSPORIDIUM
Section 611.1003 - Source Water Monitoring Requirements: Sampling Locations
Current through Register Vol. 48, No. 38, September 20, 2024
a) A supplier required to conduct source water monitoring under Section 611.1001 must collect samples for each plant that treats a surface water or groundwater under the direct influence of surface water source. Where multiple plants draw water from the same influent, such as the same pipe or intake, the Agency may, by a SEP issued under Section 611.110, approve one set of monitoring results to be used to satisfy the requirements of Section 611.1001 for all of the plants.
b) Source Water Sampling
c) A supplier that recycles filter backwash water must collect source water samples prior to the point of filter backwash water addition.
d) Bank Filtration
e) Multiple Sources. A supplier with plants that use multiple water sources, including multiple surface water sources and blended surface water and groundwater sources, must collect samples as specified in subsection (e)(1) or (e)(2). The use of multiple sources during monitoring must be consistent with routine operational practice.
f) Additional Requirements. A supplier must submit a description of its sampling locations to the Agency at the same time as the sampling schedule required under Section 611.1002. This description must address the position of the sampling location in relation to the supplier's water sources and treatment processes, including pretreatment, points of chemical treatment, and filter backwash recycle. If the Agency does not respond to a supplier regarding sampling locations, the supplier must sample at the reported locations.
BOARD NOTE: Derived from 40 CFR 141.703.