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•? '••'*• v'vi ?-- • •i^nr-------------^ 'T’.'w ■,. f ^ V- ^WM^>ify:' ' <br />f'p. <br />";<!v<. <br />i.Vii< <br />te ''**' <br />.• '*■ <br />Ai" <br />; '^■ <br />1%-^^ far"',.' <br />V <br />fi-m i <br />||:':Av' y <br />rV-''<r-^> <br />■■? <br />gr, S <br />^&V'"tifmtf <br />>K;r£,s* ■' <br />JSf:. <br />!!»£’? <br />el''r/'£ <br />i®li <br />,> .:» :-x»il« <br />'ir'r?;' <br />iSM. <br />1 <br />2 <br />3 <br />4 <br />5 <br />f <br />7 <br />• <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />19 <br />If <br />17 <br />>• <br />19 <br />20 <br />21 <br />22 <br />23 <br />24 <br />29 <br />2f <br />27 <br />at <br />29 <br />30 <br />31 <br />32 <br />33 <br />34 <br />39 <br />3f <br />OS/13/91 lar/ISOR 1 CMR/9D AR1434 <br />S^SkfeL'l'i':'''lfe-,.>-, ,' _ <br />bt. . r . <br />12) For underground storage tank systems with a <br />secondary barrier within the excavation zone* the sampling or <br />testing aethod used can detect a release between the underground <br />storage tank systeo and the secondary barrier according to the <br /># <br />following requlreaents: ._ . . - ^iv- ''t-.‘ <br />(a) the secondary barrier around or beneath . <br />• - • • • ^ • - <br />the landerground storage.tank systea consists of artificially . • <br />* % ^ • • • <br />constructed aaterial that is sufficiently thick and iaperaeable* <br />.f • - * - <br />being at least 10** centiaeters per second for the regulated <br />♦ <br />a <br />substance stored* to direct a release to the aonitoring point <br />and permit its detection; <br />(b) the barrier is compatible with the <br />e <br />regulated substance stored so that a release from the <br />underground storage tank system will not cause a deterioration <br />of the barrier allowing a release to pass through undetected; <br />(c) for cathodically protected tanks* the <br />secondary barrier aust be installed so that it docs not <br />interfere with the proper operation of the cathodic protection <br />system; <br />(d) the groundwater* soil moisture* q/ <br />rainfall will not render th.^ testing or sampling method used <br />inoperative so that a release could go undetected for more than <br />30 days: <br />' (e) the site is assessed to ensure that ^ne <br />•% <br />secondary ^-^rrier is always above the groundwater and nut in a <br />29-year flood plain* unless the barrier and monitoring designs <br />m <br />are for use under such conditions} and <br />(f) monitoring wells and vapor aonitoring <br />points are clearly aarked and secured to avoid unauthorised <br />access and taapering. <br />13) for tanks with an internally fitted liner* an <br />automated device can detect a release between the inner wall of <br />the tank and the liner* and the liner is compatible with the <br />substance stored. <br />t.- Any ether type of release dctcekion aethod* or <br />coabination of aethods* can be used if: <br />I <br />i <br />■! <br />i <br />'S,*7 <br />i <br />I4 <br />I <br />•s <br />■i* <br />•Jm <br />ni <br />iI <br />.-•Osis