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Cal. Code Regs. Title 23, Division 3, Chapter 16, Underground Tank Regulations (i) If the local agency does not approve the monitoring program, the owner or operator shall replace, repair, upgrade, or close the tank in accordance with the applicable provisions of this chapter and local agency approval. 0) Equipment and devices used to monitor underground storage tanks shall be installed, calibrated, operated, and maintained in accordance with section 2638. (k) When an unauthorized release is indicated during the installation of a release detection system, the owner or operator shall comply with the release reporting requirements of Article 5 and, if the release came from the existing tank, shall cease the installation proem until the tank system is replaced, repaired, upgraded, or closed in accordance with the applicable provisions or this chapter. ( 1) When implementation of the monitoring program, or any condition, indicates that an unauthorized release may have occurred, the owner or operator shall comply with the release reporting requirements of Article 5 and shall replace, repair, or close the underground storage tank in accordance with the applicable provisions of this chapter. Authority: Sections 25299.3 and 25299.7, Health and Safety Code. Reference: Sections 25283, 25284.1, 25291 and 25292, Health and Safety Code; 40 CFR 280.40 and 280.41. § 2642. Visual Monitoring. (a) An owner or operator who is required pursuant to section 2641(d) to implement a visual monitoring program shall comply with all of the following requirements:. (1) All visible exterior surfaces of an underground storage tank, including any visible horizontal surface directly beneath the underground storage tank, shall be inspected at least daily by direct viewing. The inspection schedule shall be established so that some inspections are conducted when the substance in the underground storage tank is at its highest level; (2) A written statement of the routine monitoring procedure shall be available at the facility and the record shall include the frequency of visual inspections, the location(s) from which inspections will be made, the name(s) and title(s) of the person(s) responsible for inspections, and the reporting format; (3) Written records shall be maintained according to section 2712 of Article 10 and shall specify the liquid level in the underground storage tank at the time of each inspection. These records shall also include a description of any sampling, analyses, and testing procedures conducted to satisfy subsection (b) of this section, including any minimum levels of detection used. (b) If any liquid is observed around or beneath the underground storage tank system, the owner or operator shall determine if an unauthorized release has occurred. An underground storage tank integrity test shall be conducted, if necessary, to determine whether the underground storage tank system is leaking. If a leak is confirmed, the owner or operator shall comply with the release reporting requirements in Article 5 and shall replace, repair, upgrade, or close the tank in accordance with the applicable provisions of this chapter. (c) Visual monitoring of the exposed portion of a partially concealed underground storage tank shall not relieve an owner or operator from monitoring the concealed portion of the tank using a non -visual monitoring method as specified in section 2641. Authority: Sections 25299.3 and 25299.7, Health and Safety Code. Reference: Sections 25292 and 25293, Health and Safety Code. § 2643. Non -Visual hlonitoringl¢uantitative Release Detection :Methods. (a) Non -visual quantitative release detection methods shall comply with the requirements of this section. Subsection (b) contains monitoring requirements for underground storage tanks; subsection (c) for pressurized piping; subsection (d) for suction piping; and subsection (e) for gravity -flow piping. Examples of release detection methods that may be used to meet the requirements of this section are in Appendix M. (b) Quantitative release detection method used to monitor underground storage tanks shall be conducted according to one of the methods listed in subdivisions (1) through (5) below, "These quantitative monitoring methods shull meet the requirements of section 2643(f) and shall he capable of detecting release rates specified in this section with at least a 95 percent probability of 26