California Code of Regulations › Title 22 - Social Security › Division 4.5 - Environmental Health Standards for the Management of Hazardous Waste › Chapter 15 - Interim Status Standards for Owners and Operators of Hazardous Waste Transfer, Treatment, Storage, and Disposal Facilities › Article 6 - Water Quality Monitoring and Response Programs for Interim Status Facilities › Section 66265.97 - General Water Quality Monitoring and System Requirements

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) The owner or operator shall comply with
				  the requirements of this section for any water quality monitoring program
				  developed to satisfy sections
				  66265.98 or
				  66265.99.
(b) Groundwater Monitoring System.
(1) Except as provided under subsection
				  (e)(3) of this section, the owner or operator shall establish a groundwater
				  monitoring system for each regulated unit. The design of the groundwater
				  monitoring system shall be based upon the information obtained from
				  hydrogeologic investigations of the facility area, including the identification
				  of the uppermost aquifer and aquifers hydraulically interconnected and a
				  determination of groundwater flow rate and direction in each such aquifer. This
				  groundwater monitoring system shall be fully operational within 180 days of
				  July 1, 1991. Until such groundwater monitoring system is fully operational,
				  the owner or operator shall continue to comply with 40 CFR Part 265 , Subpart
				  F. This groundwater monitoring system shall include:
(A) a sufficient number of background
				  monitoring points (at least one) installed at appropriate locations and depths
				  to yield groundwater samples from the uppermost aquifer that represent the
				  quality of groundwater that has not been affected by a release from the
				  regulated unit;
(B) for a detection
				  monitoring program under section
				  66265.98:
1. a sufficient number of monitoring points
				  (at least three) installed at appropriate locations and depths to yield
				  groundwater samples from the uppermost aquifer that represent the quality of
				  groundwater passing the point of compliance and to allow for the detection of a
				  release from the regulated unit;
2.
				  a sufficient number of monitoring points installed at additional locations and
				  depths to yield groundwater samples from the uppermost aquifer as necessary to
				  provide the best assurance of the earliest possible detection of a release from
				  the regulated unit; and
3. a
				  sufficient number of monitoring points and background monitoring points
				  installed at appropriate locations and depths to yield groundwater samples from
				  other aquifers, low-yielding saturated zones and from zones of perched water as
				  necessary to provide the best assurance of the earliest possible detection of a
				  release from the regulated unit; and
(C) for an evaluation monitoring program
				  under section
				  66265.99:
1. a sufficient number of monitoring points
				  (at least three) installed at appropriate locations and depths to yield
				  groundwater samples from the uppermost aquifer that represent the quality of
				  groundwater passing the point of compliance, and at other locations in the
				  uppermost aquifer as necessary, to provide the data needed to evaluate changes
				  in water quality due to the release from the regulated unit; and
2. a sufficient number of monitoring points
				  and background monitoring points installed at appropriate locations and depths
				  to yield groundwater samples from other aquifers, low-yielding saturated zones
				  and zones of perched water as necessary to provide the data needed to evaluate
				  changes in water quality due to the release from the regulated
				  unit.