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adopt new section to read: 2642. Visual Monitoring �LIS�i1C V(7( (a) Visual monitoring shall be utilized as the principal leak detection monitoring method, where feasible, for(j visibl�l exterior surfaces of an underground storage tank unless thf4 owner demonstrates to the local agency that at least one ol�' the exemption criteria o subsection (b) of this section Is a PDllca ble. If visual monitoring Ss required, the provisions of Subsections (o) and (d) of this section shall rt' Y. be followed. b) The owner is exempt from visual monitoring for that portion of the underground storage tank to which the following conditions apply. (1) Any Portion of an underground storage tank that is in contact with the ground L a floor, or-_pad such that It cannot be seen. An unaeriround storage tank in a l4, s`sd hou T not typically qualify for an exemption. �,n�•' (2) Visual inspection of the underground storage tank would Put a person in a physically unsafe environment. j'"' (3) Visual inspection of the underground storage tank would require the use of extraordinary personal protection �- equipment (other than normal protective equipment, such as steel-toed shoes, hard hat, eye or ear protection, ¢ etc.): r t. -.• (4) The underground storage tank is located at a facility which is not staffed on a daily basis. o) A visual monitoring program shall incorporate all of the following- (1) Provisions for routine direct visual inspection of all accessible exterior surfaces of an underground storage tank and the horizontal surface d}reetly_beneath the Y1,•' underground storage ta-W-shall be monitgred_by_diregt v�ewln i (2) A written routine monitoring procedure shall be prepared pj1��d be available at the facility which Includesfl�the frequency of visual inspections, the s. location S) from which observerations will be made, the name(s) or title(s) of the per (s) responsible for performing the observations a,{d�he reporting format. (3) Visual inspections shall be performed daily, at a minimum, and shall be more frequent necessary. The inspection schedule shall be established such that some of the inspections occur when the liquid In the J underground storage tank is at its highest level. The � inspsction frequency shall be determined such that any unauthorized reieaae=ww111remilA 5Ui4rv56le on'the- �.' exterior-of-S-r the horizontal su'rTaFi3-Immediately b4nea_ _ Tfe„ntank-Detwesl i_visual Inapeetionn• The evaluation of how long the hazardous �•. substance remains observable shall consider the volatility of the hazardous substance and the Porosll and slope of the surface immediately beneath the underground storage tank or portion thereof being visually monitored. (4) Recordation of the observations made and the liouid leyT�he-undergro t e inspection. wnd s.tD rage tank at the time of (d) The observation of any liquid on the exteriorof or the horizontal surface immediately beneath the underground storage tank being visually monitored shall cause the own, or operator to Implement all or a portion of the followin)I actions. The applicable actions and their timing shall bt based on the site-specific situation, shall be intended ti determine if the observed liquid constitutes an unauthor3� release, and shall be Included in the permit. (1) Laboratory or field analysis of the observed liquid Which shall include minimum levels of detection. (2) Testing of the underground storage tankutilizing th, Procedures described in Section 2643 of this article] (3) Removing all hazardous substances from the undergroue storage tank. (e) Visual monitoring of the exposed portion of a partially concealed underground storage tank shall not relieve an owner from implementing monitoring for the concealed portl of the tank using a monitoring alternative specified in Section 2641 this article. Authority: HASC 25299.3 Reference: HASC 25292, 25293