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penetration (entry) fittings must also be product tight. Furthermore, sumps and <br /> UDCs must be properly installed, operated, and maintained to provide protection <br /> against the entry of liquids and vapors into the backfill. <br /> 3. For USTs installed on or after July 1, 2003, can secondary containment be open to <br /> rainfall or water intrusion? <br /> No. All secondary containment components must be installed to prevent water <br /> intrusion into the system by precipitation, infiltration, or surface runoff. [H&S <br /> Code, §25290.2(c)(3).] The primary function of this requirement is to keep water <br /> out of the containment areas (e.g., tanks, piping, sumps, UDC) so that, in the <br /> event of a release, the stored substance can be detected and contained until it is <br /> cleaned up. In response to the detection of water into these containment areas, <br /> the owner or operator must remove and properly dispose of such water, identify <br /> the source(s), and correct the problem to prevent further water intrusion. The <br /> owner or operator should not make any modifications to the UST system that <br /> would nullify or void manufacturer warranties or independent testing organization <br /> approvals. <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />