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LG 162 -2 - 7 - <br /> satisfy the monitoring requirement in Section 25290 . 1 ( d ) , These components <br /> include , but are not limited to , riser piping and access points on top of the tank , <br /> which provide access to the primary containment of the tank and may be in <br /> contact with vapors of the stored product . <br /> The requirement for sumps and UDCs to have sensors is as follows . Sumps and <br /> UDCs installed and monitored in accordance with paragraph AA , above , must <br /> have sensors that are capable of detecting liquid and vapor releases from the <br /> primary containment . No sensors are required for sumps and UDCs installed <br /> and monitored in accordance with paragraph A . ii , above . Sumps and UDCs <br /> installed and monitored in accordance with paragraph A . iii , above , are only <br /> required to have sensors that are capable of detecting liquid releases . <br /> Co For UST components monitored continuously using vacuum , pressure , or <br /> interstitial liquid level measurement methods , is additional testing or <br /> evaluation necessary ? <br /> If the component ' s current listing includes approval for its use with continuous <br /> monitoring using vacuum , pressure , or interstitial liquid level measurement <br /> methods , no further testing or evaluation is necessary . However , if the <br /> component ' s current listing does not include approval of its use with continuous <br /> monitoring using vacuum , pressure , or interstitial liquid level measurements , <br /> additional testing or evaluation may be necessary . Owners and operators should <br /> ensure that UST components are approved for use with a continuous monitoring <br /> system using pressure , vacuum , or interstitial liquid level measurement methods <br /> consistent with the requirements outlined in Sections 2631 ( b) and (d ) , Title 23 , <br /> CCR , as applicable . <br /> D . For USTs installed on or after July 1 , 2004 , is the annual line tightness test <br /> on pressurized piping required ? <br /> No . For USTs installed on or after July 1 , 2004 , an annual line tightness test on <br /> the primary piping is not required . <br /> If you have questions regarding this document , please contact the UST Program at <br /> (916) 341 - 5775 or via e- mail at ust(a),waterboards . ca . gov . <br /> Sincerely , <br /> Original signed by <br /> Kevin Graves , P . E . , Manager <br /> Underground Storage Tank Program <br /> California Environmental Protection Agency <br /> 0a Recycled Paper <br />