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SWRCB JUNE 2008 <br /> General Re uirements for all USTs <br /> , <br /> Required on all Required on all USTs. If tank system constructed Pre-July 1, <br /> • All USTs USTs. No manual override and meets one of the following 2003 <br /> shall be options: • SW UDC construction with <br /> resistant to • Minimum 5 gallon continuous monitoring. <br /> corrosion or capacity. • Device activates at 90%; restricts flow or CCR 2636(g)(C) <br /> have corrosion CCR 2635(b)(1)(B) triggers audible and visual alarm. (Devices such <br /> protection. as ATG OR Ball float/vent valve may be used to fulfill this • Testing required every three years. <br /> • Resistant to requirement.) CCR 2635(b)(2)(A) HSC 25284.1;CCR 2637 <br /> galvanic corrosion <br /> Device activates at 95%; restricts flow and If tank system constructed on or after <br /> OR • Method to remove OR activates audible alarm five minutes before July 1. 2003: <br /> liquid from the overfill. (Devices used in conjunction with each other <br /> • Components bucket. such as ball float/vent valves, ATG's, and external • Must be liquid and vapor tight. <br /> CCR 2635(b)(1)(C) audible and visual alarms may be used to fulfill this <br /> must be requirement.) CCR 2635(b)(2)(B) <br /> isolated from • For monitoring of UDC see <br /> the backfill, • Required to be ®R Device activates at 95%; provides positive "Monitoring of Double-walled Piping <br /> including tested annually. shutoff of flow to the tank. Installed Before July 1, 2004". <br /> turbines, (Devices such as drop tubes/flapper valves may be HSC 25290.2 <br /> risers, and spill HSC 25284.1,25284.2 used to fulfill this requirement.)CCR 2635(b)(2)(C) <br /> p Also See LG-166 <br /> buckets. • Device activates before fittings are exposed J tank system constructed on or after <br /> OR to product and provides positive shutoff. July 1, 2004: <br /> 40 CFR 280.31, 280.70; (Devices such as drop tube/flapper valves may be used <br /> CCR 2635(a)(2);2636(b), to fulfill this requirement.)CCR 2635(b)(2)(D) • Must be liquid and vapor tight. <br /> 2662(c) <br /> • Requirement may be waived by local agency if all of • Required construction depends on <br /> the following conditions are met: piping configuration. <br /> -Inlet exists in observable area. • For monitoring of UDC see <br /> -Spill container adequate to collect any overfill. "Monitoring of Double-walled Piping <br /> -Tank system filled by no more than 25 gallons at one Installed after July 1, 2004". <br /> time. <br /> CCR 2635(b)(3). Also see LG-150 HSC 25290.1 <br /> Page 2 of 7 <br />