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� <br /> vState Water Resources Control Board a .; <br /> Division of Water Quality Gray Davis <br /> Winston H.Hickox 10011 Street•Sacramento,California 95814•(916)341-5752 Governor <br /> Secrelaryfor Mailing Address:P.O.Box 2231•Sacramento,California•95812 <br /> Environmental FAX(916)341-5808•Internet Address: http://www.swrcb.m.gov <br /> Protection <br /> nian needs to <br /> The For energy <br /> ist ofsimpleaCaliforniachallengefcing <br /> waysyro canreduce�demand and cual. Every d Your energy costs,immediate <br /> ,see our websitee at hRp.-1A~..nvvrconsumption. <br /> rcb.agov <br /> May 15,2003 <br /> LG 161-2 <br /> ENHANCED LEAK DETECTION <br /> (Available electronically at http://Www,swrcb.ca.gov/ust) <br /> To: Local Agencies and Other Interested Persons <br /> The purpose of this letter is to provide a general overview of the enhanced leak detection (ELD) <br /> requirements and to answer the most common questions regarding ELD that have arisen to date. <br /> This letter is intended as a working document and may be periodically updated as new <br /> information becomes available and as new questions arise. <br /> What is ELD? <br /> ELD is a test method that ascertains the integrity of an underground storage tank(UST) system <br /> by the introduction and external detection of a substance that is not a component of the fuel <br /> formulation stored in that UST system. [Cal. Code Regs., tit.23, § 2644.1, subd. (a)(1)] <br /> The ELD test method must be: <br /> • Third-party certified; and <br /> • Capable of detecting both vapor and liquid phase releases at a leak rate of at least 0.005 <br /> gallons per hour(gph), with a probability of detection) ()lat east 95% and a probability of <br /> false alarm no greater than 5%. [1d. § 2644,1, subd. (a)(2)] <br /> Who is required to perform ELD? <br /> Owners/operators of UST systems installed prior to July 1, 20031 and located within 1,000 feet <br /> of a public drinking water well must perform ELD. [Health& Saf. Code, §§25292.4;25292.5; <br /> Cal. Code Regs.,tit,23, §§ 2640, subd: (e); 2644.1, subd. (a)(3)] The SWRCB UST Program is <br /> responsible for notifying owners/operators of facilities that are subject to the ELD requirement. <br /> • What is a public drinking water well? A"public drinking water well' is a wellhead <br /> that: <br /> ♦ Provides drinking water to a public water system;2 <br /> ♦ Is regulated by the State Department of Health Services (DHS); and <br /> t USTs installed on or after July 1,2003 are those systems that are installed and monitored in accordance with <br /> Health and Safety Code,section 25290.1. <br /> 2 A"public water system"is a system that provides water for human consumption through pipes or other constructed <br /> conveyances that has 15 or more service connections or regularly serves at least 25 individuals daily at least 60 days <br /> out of the year. [Health&Saf.Code,§ 1162751 <br /> California Environmental Protection Agency <br /> Recycled Paper <br />