§ 2647. Vadose Zone Monitoring Requirements.
23 CA ADC § 2647Barclays Official California Code of Regulations
23 CCR § 2647
§ 2647. Vadose Zone Monitoring Requirements.
(a) Owners or operators of existing underground storage tanks who use vadose zone monitoring as part of a non-visual monitoring program shall comply with the requirements of this section. Vapor monitoring, soil-pore liquid monitoring, or a combination of these or other vadose zone monitoring methods may be used.
(b) Vadose zone monitoring shall not be used as the sole release detection method of non-visual monitoring where the monitoring well cannot be located within the backfill surrounding the tank, or where the existing ground water level or the highest anticipated ground water level, including intermittent perched ground water, is less than 10 feet below the bottom of the tank. Ground water levels shall be determined in accordance with section 2649(c).
(d) The number, location, and depths of vadose zone monitoring points shall be selected to achieve the objective specified in section 2641(a). Where possible, monitoring points shall be located within the excavation backfill surrounding the underground storage tank. The owner or operator shall determine the exact location of the underground storage tank and associated piping before attempting to install monitoring wells and/or devices pursuant to local agency approved.
(h) Site assessments conducted on and after October 1, 2018 in accordance with subdivision (g) 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.
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) and (g), new subsection (h) 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, § 2647, 23 CA ADC § 2647
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