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California State Fire Marsha( <br />CODE INTERPRETATION <br />Date Issued July 27, 2007 Interpretation Q6-124 <br />Topic Healy Clean Air Separator (CAS) Tank as a "Vapor <br />Processin Unit" <br />Code Section(s) CFC 5202.13.3.9 <br />Requested by Don Foster <br />Gettler-Ryan Inc. <br />1364 N. McDowell Blvd, Suite B2 <br />Petaluma, CA 95954 <br />The California State Fire Marshal has accepted the UL certification of the <br />Healy Clean Air Separator (CAS) Tank as a "Vapor Processing Unit". 2001 <br />CFC Section 5202,13.3.9 indicates that the vent termination from vapor <br />processing units shall be not less than 8 feet above the processings unit <br />itself. <br />All of the Healy Installation materials and the California Air Resources <br />Board Executive Order VR -202 -A exhibits indicate that the underground <br />storage tank pressure vacuum vent valve termination need only be iocated <br />12 feet above grade. No reference is made to the 8 foot separation <br />requirement. <br />We have two Questions for your consideration and interpretation: <br />I. Does the UST pressure vacuum vent valve need to be located 8 feet <br />above the CAS Tank as indicated on the attached Detail I? <br />No. The design of the CAS is such that all vapors from the UST are corrin 1pletely <br />trapped within the "bladder" contained in the CAS. The vent coming frons the <br />CAS is to vent the interstitial space between the bladder and the outside 'Fail of <br />the CAS. (See footnote below) <br />