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^--‘r.:-' v :k :k. V, <br />St'- -•ifv <br />S’*!*.. V\r!^:sl <br />miA'- <br />V <br />llfr- <br />p!'-' <br />81 <br />'v* <br />iir <br />WV' <br />!- . <br />pipF.. <br />Kit,:sasr <br />^ ' '7 <br />IS®' <br />1f- <br />1 <br />2 <br />3 <br />4 <br />5 <br />< <br />7 <br />I <br />f <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />10 <br />18 <br />19 <br />20 <br />2] <br />22 <br />33 <br />24 <br />2$ <br />30 <br />27 <br />20 <br />29 <br />30 <br />31 <br />32 <br />33 <br />34 <br />39 <br />30 <br />05/13/91 (REVISOR 1 CMR/aO AR1834 <br />■cdiuoi s«nds« coarse silts* or other permeable eaterials; <br />(3) the slotted part of the monitoring wall <br />easing must'be designed to prevent migration of natural soils or <br />filter pack into the well and to allow* entry of regulated <br />substance on the water table into the well under both high and <br />lew groundwater conditions: <br />(4) monitoring wells are sealed from the ground <br />surface to the top of the filter pack: <br />(9) monitoring wells or devices intercept the <br />escavation'tone cr are as close to it as is te:hnically <br />feasible: <br />(6) the continuous monitoring devices or manual <br />methods used can detect the presence of at least one'*eighth of <br />an inch of free product on top of the groundwater in the <br />monitoring wells: <br />(7) within and Immediately below the underground <br />storage tank system excavation rone* the site Is assessed to <br />ensure compliance with the requirements in subitems (1) to (5), <br />and to establish the number and positioning of monitoring wells <br />or devices that will detect releases from any part of the tank <br />that routinely contains product; and <br />(8) monitoring wells are clearly marked and <br />secured to avoid unauthorised access and tampering. <br />I. Interstitial monitoring between the underground <br />storage tank system and a secondary barrier immediately around <br />or beneath it mmy be used* but only if the system is designed* <br />constructed* and Installed to detect a leak from any part of the . <br />tank that routinely contains product and also meats one of the <br />requirements of subitems (1) to |3). <br />(1) For double-walled underground storag: tank <br />systems* the sampling or testing method can detect a release <br />through the inner wall in any part of the tank that routinely <br />contains product. The previsions outlined in the Oteel Tank <br />Institute's ftandard for Dual Wall Onderground Storage Tanks may <br />be used as guidance for aspects of the design and construction <br />of underground oteel double-walled tanks. <br />I