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LG 162 -2 - 4 - If the results of post- installation testing indicate that the UST system is leaking liquid or vapor , the owner or operator must take appropriate actions to correct the leakage , and retest the system using the same approved test method until the system is no longer leaking liquid or vapor . 7 . What requirements apply to a UST installation if installation started prior to July 1 , 2003 , but is not completed until after July 1 , 2003 ? If the tank and associated piping are not placed in the ground prior to July 1 , 2003 , the UST is subject to the new installation and monitoring requirements of H & S Code , Section 25290 . 2 . [ H &S Code , § 25290 . 2 . ] As always , the local agency must have approved the installation plan prior to placement of the tank and associated piping in the ground . Please note the following for a UST placed in the ground prior to July 1 , 2003 , following approval of the installation plan by the local agency . Such a UST is not subject to the new installation and monitoring requirements of H & S Code , Section 25290 . 2 . However , the owner/operator of that UST system is required to perform a one-time ELD test on or before January 1 , 2005 , if the UST system is located within 1 , 000 feet of a public drinking water well . [ H & S Code , §25290 . 2 ( 1) (3) ; H & S Code , §25292 . 5 ( a ) and ( b ) . ] 8 . Does a repair or modification to a UST , NOT installed in accordance with H & S Code , Section 25290 . 2 , subject the UST to the requirements of this section ? No , not unless the tank is replaced . USTs only become subject to H & S Code , Section 25290 . 2 when the tank is replaced . Therefore , for USTs installed prior to July 1 , 2003 , replacement of spill containment , sumps , product piping , vapor recovery piping , or vent piping would not subject the component or the UST system to the new installation and monitoring requirements of H &S Code , Section 25290 . 2 . 9 . What components of USTs installed on or after July 1 , 2003 and prior to July 1 , 2004 are required to be monitored in accordance with H &S Code , Section 25290 . 2 ( d ) ? As for all USTs installed since January 1 , 1984 , USTs installed on or after July 1 , 2003 and prior to July 1 , 2004 must also be equipped with a continuous monitoring system " capable of detecting the entry of the hazardous substance stored in the primary containment into the secondary containment . " [ H &S Code , §25290 . 2 (d ) ; CCR , §2630 (d ) . ] All sumps , UDCs , and the interstitial spaces of tanks and piping ( including product , vent , vapor recovery , and fill pipe ) must have sensors that are capable of detecting liquid releases from the primary containment . Components subject to the monitoring requirement of Section California Environmental Protection Agency (a Recycled Paper