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r <br /> establishes that the underground storage tankA s not the <br /> source of the hazardous substance or has beefi properly <br /> repaired since the unauthorized release and' that any <br /> aubse uent unauthorized release from the Anderground storage <br /> tank cAn be detected despite the presen 4b of the hazardous <br /> substace already In the environment. <br /> (m) If soil analysis indicates that an "authorized release has <br /> occurred the permittee shall report the release pursuant to <br /> Article � of this subchapter and xhall repair or close the <br /> underground storage tank pursuant to Article 6 or 7 of this <br /> subchapter- <br /> 1 <br /> (n) If evidencelof an unauthorized release is not detected, an <br /> alternativel.leak detection monitoring system shall be <br /> installed pursuant to Sectlfon 2641 of this article. <br /> n sem, <br /> Authority: H&SC 2 99-3 <br /> i- Reference: HkSC 25292 <br /> 1 <br /> 1 <br /> Adopt new section to" read* <br /> 2646. Vadose Zone Mo it ring <br /> (a) All owners of exi ting underground storage tanks <br /> implementing one o the monitoring alternatives described in <br /> Section 2641 of hi article which requires vapor .or another <br /> form of vadose one onitoring shall implement the vadoae <br /> zone detection .on ring system pursuant to Subsections (b) <br /> through (h) o this s ction. <br /> (b) Vadose zone onitoring shall consist of vapor monitoring. <br /> T '" Iw.-r$; ..:w sail-pore 1 quid Aonito Ing, or other forma of vadose zone <br /> monitoring Combinatio of these methods may be used. <br /> (c) Wells for vapor monitorin shall be fully perforated except <br /> for that portion adjacent to a surface seal and that portion <br /> of the ottom of a we 11 wh re a plugged, blank segment of <br /> casing is used as a free 11 uid trap. <br /> (d) The n tuber, location, and de the of vadose zone monitoring - <br /> poinVs shall be selected so a to give the earliest possible <br /> warn/fng of any unauthorized re ease from the underground <br /> storage tank. <br /> (e) Subsurface vadose zone monitoring\systems shall , if <br /> po'331ble, be located within the backfill surrounding the <br /> underground storage tank. <br /> 4.21 <br />