§ 2648. Ground Water Monitoring Requirements.
23 CA ADC § 2648Barclays Official California Code of Regulations
23 CCR § 2648
§ 2648. Ground Water Monitoring Requirements.
(a) Owners or operators of existing underground storage tanks who use ground water monitoring as part of a non-visual monitoring program shall comply with the requirements of this section. Ground water monitoring may be used in combination with other quantitative or qualitative release detection methods or, where permissible under this section, as the sole release detection method.
(2) Continuous monitoring devices or manual methods are used which are capable of detecting the presence of at least one-eighth of an inch of free product on top of the ground water in the monitoring wells. This capability shall be certified by an independent third party using an appropriate evaluation procedure. Examples of acceptable evaluation procedures are in Appendix IV;
(c) Compliance with the conditions specified in subdivision (b) above, shall be based on a site assessment, including assessment of the areas within and immediately below the underground storage tank excavation zone. If ground water monitoring is approved as the sole release detection method of a non-visual monitoring program, the number and location of the monitoring wells and/or devices as approved by the local agency shall also be based on this site assessment with minimum requirements as follows:
(d) Site assessments conducted on and after October 1, 2018 in accordance with subdivision (c) above, shall be signed by a professional engineer, professional geologist, or equivalent licensed professional with experience in environmental engineering, hydrogeology, or other relevant technical discipline.
(e) Ground water monitoring shall be conducted at least once every 30 days or continuously. Any continuous monitoring system shall be capable of detecting the presence of hazardous substance on top of the ground water in the monitoring well and shall allow periodic collection of samples. Ground water samples shall be analyzed by visual observation or field or laboratory analysis as approved by the local agency depending on the method of monitoring and the constituents being evaluated. The local agency may require periodic laboratory analysis where visual observation or field analysis does not provide an adequate degree of detection as compared to that of laboratory analysis. Sampling conducted which requires field or laboratory analysis shall comply with the minimum requirements of section 2649(g).
(f) The number, location, and depths of ground water monitoring wells shall be selected to achieve the objective specified in section 2641(a). Monitoring wells shall be located as close as possible to the underground storage tank or the perimeter of the underground storage tank cluster, subject to the review and approval of the local agency.
Credits
Note: Authority cited: Sections 25299.3 and 25299.7, Health and Safety Code. Reference: Section 25292, Health and Safety Code; and 40 CFR §§ 280.43 and 280.45.
History
1. Repealer and new section filed 8-9-91 as an emergency; operative 8-9-91. Text remains in effect uninterrupted pursuant to Health and Safety Code section 25299.7 (Register 92, No. 14).
2. Editorial correction of printing errors in History 1 (Register 92, No. 43).
3. Amendment filed 4-5-94; operative 5-5-94 (Register 94, No. 14).
4. Amendment of subsections (b)(4), (b)(5) and (c), new subsection (d), subsection relettering, amendment of newly designated subsection (e) and amendment of Note filed 8-27-2018; operative 10-1-2018 (Register 2018, No. 35).
This database is current through 6/7/24 Register 2024, No. 23.
Cal. Admin. Code tit. 23, § 2648, 23 CA ADC § 2648
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