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+a / 1 (D) Underground storage tank gauging shall be be followed. performed according to the specifications of Subsection (c)(7)(B) of this section. Variation') The owner is exempt from visual monitoring for that portion in excess of 1 percent of the underground stora8 of the underground storage tank to which the following tank volume or 50 gallons, whichever is less, conditions apply. ! shall be cause for further evaluation. Any I (d) The local agencies shall evaluate each monitoring (1) contacrtion of an underground storage tank that is in alternative proposed to determine if it achieves the cannot be seen. An�unde-rgroundund, a rstorage dtank such nhat it objectives specified in Subsection (b) of Section 2640 of saddle should not typically qualify for an exemption. this article according to the following: (1) Whenever !` (2) Visual inspection of the underground storage tank would Possible, a primary method of monitoring oth put a person in a physically unsafe environment. than ground water monitoring shall be performed, monthly at a minimum. (3) Visual inspection of the underground storage tank would require(2) Where the underground storage tank is in an area wheni' equipmenth(othere use othantnormalnpry personal protection precipitation or surface runoff protective equipment, such recharge of the Provides direct et steel-toed shoes, hard hat, eye or ear protection, g ground water and the ground water beii etc.). recharged has an actual or Potential municipal, agricultural, orindustrialssupply)stac� (4) The underground storage tank is located at a facility monitoring method other than ground water monitoring which is not staffed on a daily basis. shall be utilized on a monthly or more frequent basis for leak detection monitoring. ;e) A visual monitoring program shall incorporate all of the (3) In addition, ground waterdescribed i, following: `} the local agencytn. thearea& describedymay e in Subsection (1) Provisions for routine direct visual inspection of all v (2) above. The local agency shall review and approve accessible exterior surfaces of an underground storage the number and location of the monitoring well(s) . tank and the horizontal surfaoQ directly beneath the More than 1 underground storage tank or facility may 1•- underground storage tank shall be monitorg��by_.diPegt v monitored using the same well provided the well is € viewing. _ directly downgradient of all underground storage tank; n or facilities being monitored and is within 1 ,000 feel (2) A written routine monitoring procedure shall be U of all underground storage tanks being monitored. prepared('1)) pd be available at the facility which ! Authority: H&SC 25299.3 includethe frequency of visual inspections, the Reference: H&SC 25292 location from which observerations will be made, the 2 name(s) or title(s) of the per (s) responsible for adopt new section to read: performing the observations ahe reporting format. (3) Visual inspections shall be performed daily, at a 2642. Visual Monitoring •ejlsS ►te, minimum, and shall be more frequent if necessary. The f inspection schedule shall be established such that some (a) Visual monitoring shall be utilized as the of the inspections occur when the liquid in the principal leak underground storage tank is at its highest level. The detection monitoring method, where feasible for (3 visibl insPgtlon frequency shall be determined such that any exterior surfaces of an underground storage tank unless the una thorized re_lea�i--Will_fgmain-observable on the owner demonstrates to the local agency that at least one of exterior—of-or the horizontal surface immediately the exemption criteria of subsection (b) of this section is bene` t-��ha=undergroupd=.--storage-_tank between_vi4ual applicable. If visual monitoring is required, the ins . The evaluation oflon provisions of Subsections (c) and (d) of this section shall substancenremains observable shallwconsiderethezardous i 4.11 4.12 • " i,�